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Ngee Ann 1973 Graduation Souvenir
CONTENTS

MESSAGES                                                                                                                                                              3


ADMINISTRATIVE STAFFS                                                                                                                                                 6


IVIECHANICAL ENGINEERING DEPARTMENT STAFFS                                                                                                                           11


ELECTRICAL AND ELECTRONIC ENGINEERING DEPARTMENT STAFFS                                                                                                              23


PHOTOGRAPHS OF ENGINEERING DEPARTMENTS' GRADUATES                                                                                                                    35

ARTICLES ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 87


MISCELLANEOUS                                                                                                                                                        91


GRADUATION SOUVENIR COMMITTEE                                                                                                                                      102


ACKNOWLEDGEMENTS                                                                                                                                                   103
Message by Dr. Lee Chiaw Meng, President
"
          After three years of hard work you have now success­
    fully completed your studies and are ready to make con­
    tributions to society. In design'ing your courses of study,
    the College has taken care of the actual needs of industry
    and the business world with which most of you will be
    associated for the greater part of your working life. The
    practical aspects of the course syllabuses and the opportuni­
    ties you were given to participate in orientation programmes
    in industrial, commercial or other establishments are the
    main features aimed towards this end. You have also been
    educated in bi·lingual environment so essential in a multi­
    racial society like ours in Singapore. You can be sure, there­
    fore, that you are placed on a firm footing at the very start
    when you step out of College,

          Those who graduated before you have obtained mea­
    ningful employment without difficulty, and you will no
    doubt find yourselves in the same advantageous position.

          This confidence that the public have placed on us is
    most encouraging, and it is for you to up-hold this con­
    fi dence and the good name of the College.




                                                                              Principal
                                                                         Or. Lee Ch iaw Meng

                                                                               fl5G*
                                                                         $ag~it±
                                                                     3
MESSAGE BY MR. PHILlP LIMB


      During your time at Ngee Ann you have worked hard,
learnt many thin!Ji and acquired new skills. You are now
fitted to take your place in the skilled workforce of
Singapore. That workforce will need to become more skilled,
so although you have done well, you cannot rest on your
laurels. You will need to continue to learn as you work, and
this will represent a real challenge. I am confident that you
will be able to meet it.


      Congratulations on completing your course and my
best wishes for the future.




                                             /1
                   ILL,                   U                         Vice - Principal
                                                                    Mr. Philip Limb

                                                                       ~~   fl3t *:



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MESSAGE BY MR. CHAN SlOW POH


           Congratulations - your period with us has been re­
     warded by the successful completion of your course of study.


              Recently, some of our "old boys" have visited me
     at the College and have mentioned that what they learned
     here was not sufficient for them to cope with their jobs.
     They said that in view ofthis they would like an opportunity
     for further study.


              I would like to point out that our main objective is
     to provide a foundation which will enable you to embark
     on your career with confidence. However, it would be a
     fallacy to think that in three years we can equip you to
     handle all the problems encountered as a technician engineer.
     Experience and knowledge are essential requirements to be
     successful in any profession. It is in the working environment
     that practical experience is gained, whilst at the same time
     further knowledge can also be acquired "if you wi 11 put your
     mi nd to the task. It is not al ways necessary that further
".
     study must be undertaken in.a formal way. I am confident
     that the foundation which we have laid here at NATC will
     enable you to pursue any further knowledge through self
                                                                           HEAD OF MECHANICAL ENGINEERING DEPARTMENT
     study.
                                                                                        Mr. Chan Siew Poh

              To conclude, may I send you all my best wishes for
     the future.
                                                                                    tJL~.If£*£1:f
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                                                                      11
VISITING PROFESSOR/ADVISER

                                               OF MECHANICAL ENGINEERING

                                                         DEPARTMENT

                                                         Dr. Alan Phillips


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                                                            ( $ E[ )




              MESSAGE BY DR. ALAN PHILLlPS


          In response to your request for a message, I am taking                his skill and technique in the live situation on the road.
    this opportunity to convey my congratulations to those
    Engineering students graduating for the NATC Diploma.                             You will, I hope, set forth into industry armed with
                                                                                the knowledge you have already gained here, but you must
         This is for you the cui mination of three years hard                   go there expecting to find an environment which will test
~
    endeavour, studying to attain this award. It is not only a                  you in many different ways. Industry is a situation in which
    test of your ability to learn the essential knowledge which                 there are many problems to which practical solutions are
    will be the foundation for your future career as a technician               required. It is in this environment that you will find your ­
    engi·neer but also of your competence to pass the numerous                  selves and gain valuable experience together with financial
    examinations along the way.                                                 reward for your la bours.


          I feel that an analogy can be made to that of a learner                     I wish you all well in this new and challenging venture
    driver who has just passed his driving test and is given his                into the Industrial Society.
    certificate of competence. He must now set out to improve
                                                                         13
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LECTURER (PART TIME)
             Mr. Kan Siew Tong

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     SENIOR ACADEMIC INSTRUCTOR
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           Mr. Soo Kia Hua

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<:'                ACADEMIC INSTRUCTOR
                         Mr. Pao Mee Kuong

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•     ACADEMIC INSTRUCTOR
         Mr. Chan Puan Jui

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ACADEMIC INSTRUCTOR
  Mr. Thong Foo Kong

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          CADET ACADEMIC INSTRUCTOR

                  Mr. Hoon Heng Jow


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                                         Mr. Keith Hargreaves

                                                   V.S.O.


               AI":.   ---­         VOLUNTEER SERVICE OVERSEAS




                       SENIOR ACADEMIC INSTRUCTOR
~                              Mrs. Christine Tan San Yee
                          (ENGLISH LANGUAGE UNIT)

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                              21
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MESSAGE BY MR. YEH SHOW KUN


      Over the last three years you have not really learnt
very much. You have, however, learnt sufficient amount
                                                                    HEAD OF ELECTRICAL &

to enable you to learn more. What is more important is
that you have now been trained to be able to learn more.      ELECTRONIC ENGINEERING DEPARTMENT

                                                                       Mr. Yeh Show Kun

      There is an abundance of knowledge waiting for you.
You can learn something every day, only if you make a
point to learn. You do not learn from the books only. You
                                                                It {Jl. & It -f .r- t[
                                                                        1I-f;4f:h¥1b1:.
                                                                                           * .t- 1£
learn from your work and the people around you.


      When you leave the College, you are beginning a new
phase of life. Let it be a fruitful and pleasant one.




                               )    ,~~~}L_(_~
                                               Yeh Show Kun

                                                        23
MESSAGE BY MR. T.B. RI LEY

                                                                         VISITING PROFESSOR/ADVISER
         I amsure you will feel jubilant now you have qualified.         OF ELECTRICAL & ELECTRONIC
      hope you agree that your effort was well worth while.
                                                                         ENGINEERING DEPARTMENT
    Congratulations! Now you are in top gear so to speak it
                                                                             Mr. Riley, Thomas Brian
    should be possible for you to maintain the pace in your
    next assignment. You have proved your ability yet you               1t~,&.It-=fI.ff-*3:.1f
    cannot rest on your laurels.                                                  (:tlf.)
•        Wherever you go from here contribute while still
    learning and set a standard of excellence which will inspire

    o'h'" folio";", yo, 'hm"h ,h;,    COII'~~


                                                 IT.B. RILEY)

                                                                   25
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ASST. LECTUER
  Mr. Ooi Tian Hock

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SENIOR ACADEMIC INSTRUCTOR

      Mr. Leow Whye Siang


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                       30
SENIOR ACADEMIC INSTRUCTOR
     Miss Wang Yea Ping

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    SENIOR ACADEMIC INSTRUCTOR

           Mr. Tang Kee Chi

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                   31
SENIOR ACADEMIC INSTRUCTOR
Mr. Tan Siak Teng @ Tan Siak Cheok


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          SENIOR ACADEMIC INSTRUCTOR

                 Mr. Sitoh Chong Hon   ~




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                         32
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     ACADEMIC INSTRUCTOR
           Mr. Tang Kim Seng

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                     ACADEMIC INSTRUCTOR
                         Mr. Tan Yew Kin


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KOH HAN CHUAN

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     138-G, Stagmont Ring
         Si ngapore 23.




,

                              Lee Chyi

                             :$       *
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                            Si ngapore 24.




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  TAN YEW TENG
                                       <'

     ~* 711 ~
2290, Satu Serendam,

       Malacca,




                  WANG KOK HENG

                    £00,*
              16A, Jalan Haji Manan,
                   Kluang, Johore,

                       Malaysia.




                    46
WONG MUI TONG

     :t ~ It
132-E, Jalan Alsagoff,
    Singapore 14.




               YEaH ENG CHIANG

                       ~St!§
                      35, Main Road,
                 Lukut, Port Dickson,
                      Negri Sembilan,
                      West Malaysia.




                 47
YONG CHO YEIT                        ....
         ;fh   1£    ~
    AG·12, Suleiman Court,
                                           .'t
 Jalan Tuanku Abdul Rahman,
        Kuala Lumpur,
           Selangor,
           Malaysia.

"The important thing in life is not
   the triumph but the struggle.
       The essential thing is

      not to have conquered

        but to have fought

                well"




                    CHAN KHAM HONG

                         ~* iX   *
                     220, Main Road,
                    Rengit, Batu Pahat,

                                           "
                         Johore.

                                           .
                    18·A. Jalan Petua.

                    Jurong Road gy> ms.

                        Singapore 21.





                             48
CHIA YONG SIAN

                    ~5R~
     25-F, Upper Bukit Timah Road, 7'1.. m.s.,
                   Si ngapore 21.




            "Success is counted sweetest
             by those who never succeed
               to comprehend a nectar
                 requires sorest need"




                             CHUA YAP SOON

                                • l1f   jlWi
                             2-A, Jalan Merbah,
                                Batu Pahat,
,)                           Johore, Malaysia.




                        49
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   ''The twin purposes of education ­
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                  L1M ENG SENG

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                 Blk. 43, 1030-G,

                 Bendemeer Road,
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         TAN L10NG KIAT

             Jr*£W
       5696-C, Batu Berendam,
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By Wong Kok Heng/Mechanical Engineering

                           ADAPTIVE CONTROL


               When we say that we have something "Under Control"            employed in industry could be increased substantially, with

...     we mean that we know what we intend to do, and are
        confident that we can see that it does. Therefore, any
                                                                             very considerable imporvements in the profitability of
                                                                             machine shops. This is particularly true of batch production
        control system will have the essential features, as follows:­        shops employing numerically controlled machines. It is
                                                                             believed that conventional machines take too much time
        (a)	   There is a plan.                                              on toolssetting and work accuracy will be depending on
        (b)	   We prepare to carry out that plan.                            specified geometry and operator skill. Numerical control
        (c)	   We compare what is being done to what is being                aims to overcome this by specifying component geometry
               done to what is being planned at all time.                    on a tape which then operates the machine automatically.
        (d)	   Instructions would be 'feedback' when any deviation           Since feedrates are also specified on the tape, job durations
               occured and we return to the plan.                            are more accurately forecast at the planning stage.

              Hence, the essence of any control system is this                     The metallurgical properties of workpieces which
        constant 'feedback' of instructions so as to correct any             influence acceptable maximum machining rates are unpre­
        deviation from plan. Everytime the control system detects            dictable and variable. Cutters are subjected to· variations.
        deviations, it sends instructions back to the control, and           Since cutting speeds are determined by the planner before
        corrective measures would be taken immediately on receipt            the event, machining rates with numerical control must
        of these instructions.                                               make adequate allowance all the time because no metal is
                                                                             homogenous throughout. This raises limitation on the ulti ­
                                  INPUT      J           .1
        INPUT CONTROL
            ... UNIT                    -- PROCESS        rOUTPUT            mate economics of numerical control, and put forward the
                                                                             question of ADAPTIVE CONTROL.
                              CORRECTIVE I
                       j
                                 ACTION
                                                                                   In recent years, great emphasis has been placed on
                                                                             optimum machining. However, to successfully achieve this
 ',,"                         JFEEDBACKJ-.                                   goal presents many difficult problems. The latest and most
                                                                             promising approach has been adaptive control.
                      Fig.1 FEEDBACK PRINCIPLE.
                                                                                     The work "adaptive" is borrowed from biology which
                                                                              abounds with examples of adaptive system. A person makes
               It is generally accepted that the metal-cutting rates         .a fairly rapid move from sea level to 10,000 ft. altitude,


                                                                        87
experiences some discomfort the first day, due to the rather                  Obviously, under any of these conditions, a conven­
substantial decrease in oxygen. However, the adaptive con­             tional feedback control system is no longer indifferent to
troller of his body go into automatic operation, and in a              variations, and system performance soon degrades to-beyond
matter of a few days, the oxygen-carrying capacity of the              acceptable limits.
blood is raised to suit the body in the new environments.
If the altitude change had occured so slowly that adaptive                  There are always at least two elements that always         "
processes had kept pace with the changes, then the period              appear in some form in adaptive control systems.
of discomfort would be avoided.
                                                                       (1)   Identification - - - ­ which refers to the measurement
      In a broad sense, any system in which a parameter is                   of the dynamic characteristics of the process to be       '"
adjusted to counteract a degradation in performance,                         controlled.
brought a bout by a change in the system's environment
could be called adaptive. In this sense, there are hundreds            (2)   Actuation - - - ­ which signifies the generation of
of adaptive control systems in present-day operation. Al­                    an appropriate actuate signal, which in turn modifies
most every jet-aircraft fuel control is temperative com­                     the adjustable characteristics.
pensated, for example.
                                                                              Identification is probably the most important aspect
                                                                       of adaptive control, and is the central element of such a
                                                                       system because adaptivity implies frequent, automatic, and
                                                t                      rapid solution of the identification problem.
 JNPUTS      CONTROLLING control 110UTPUTS
               ELEMENTS   signals lPROCESS I .....                           And Actuation acts upon information about the
                                                                       present system performance, and the desired or optimum
                                                                       performance, to decide what corrective measures to take,
                        Adjustment    Signals                          and to determine the required controller characteristics. It
                                                                       also acts upon the decision taken, and initiates the required
       IDEAL STRUCTURE OF ADAPTIVE CONTROL.                            modification so as to drive the system towards the optimum.

                                                                             In the metal-cutting industry, the concept of adaptive
      An adaptive control system is required when a con­               control means that the tool can react for the optimum
ventional controller cannot work. For example, a controller            advantage to unpredictable changes in cutting conditions.
might be required to compensate for such things as:                    An operation usually selects speeds on the conservative side
(a)	    Changes in the process transfer function, or in para­          to avoid risking damage to the part on machine. Adaptive
        meter value, with changes in its environment, example          control, on the other hand, responds to the actual cutting
        an aircraft's transfer function changes with air speed,        conditions. When the tool is sharp and the workpiece not
        height, air pressure, temperature etc.                         too difficult to machine, the speed will be high, but as the
                                                                       tool becomes dull or hits hard spots the automatic control
(b)	    Changes in the system itself, example wear, mechanical
                                                                       will cut the speed back to suit the cutting conditions. In
        failure.
                                                                       this way optimum production rate can be maintained.
                                                                  88
Initial speeds and feeds do not have to be carefully                   3)   'Proceedings' of IEEE. 1840, July 1970.
        chosen. Sensors, usually based on spindle torque, tool                        4)   Handbook of Automation, Computation and Control.
        vibration and tool tip temperature, will feed the required
1)
                                                                                                     By Eugene M. Grabbe
        information back to the performance measurement com­
        puter. The computer calculates the metal removal rate, tool
        vvear rate, and surface finish. When this information is
        received, the controller will modify the initial feed and
        speed to opti mize the overall machining performance.


              There are disadvantages to adaptive control which
        must at all times be borne in mind. Generally, an adaptive
        control is necessarily complex and expensive. It should be
        remembered that adaptive control can hardly be justified,
        and should not be used unless parameter variations are wide
        and unpredictable.

                                       position
       Programmed                     commands
                        N. C.                         machine       output
       feeds, speeds,   System                    .    tool
     & tool positions                   corrected
                                    feed and speed
                                                          sense
             Feed & speed                                 parar
               correction                                 (vibr
                            "'"'­    ADAPTIVE I--         torql
                                    CONTROLLER            tip-t l            e
                                                            etc.

                        ADAPTIVE CONTROL SYSTEM
~


        Reference:

        1)    System Identification For Self-Adaptive Control.
                         By W.D.T. Davies
        2)    System Engineering Handbook.
                         By Robert E. Machol

                                                                                 89
我萦馀缘路放言十典梨作之间的困戴                         李海宝
                                                            F




                                                            。




  大多数的业余无线电爱好者都会遇到一些问题,当      应该是为了达到目的,而使出种种设计上的怪招,非那

他们怀着满腔的信心与期望,开始根据什这所登载的线      种零件,那种调整步骤,否则的话,一切将化为乌有!

路去购买零件,立在备挥接工作时,忽然发现到某些零件       相反的,他们应该考虑到一些零件规格的误差问题

,在本地无法买到,或者是有这些零件,但是规格不相      市场的供应问题,装配程序问题,否则. ,当设计者把线

同。於是,他们开始镑徨,是否可以买?或者是否可以      路装好时,将是第一个面临失败者!

更改线路,团团的疑云,使到他们的信心动摇,终於放          对於业余的装作者们,他们所期望的是根据什读中

弃了!也有些人千辛万苦终於把零件找齐了,根据什诚、     「好效果的制作品 J ,将会在自己的仿制品中出现,然
中的制作,他们本该获得所需的效果,但是,当他们试      而现实往往会使到他们失望,我曾经看过一个工场指导
验的时候,不是整架不能工作就是毛病丛生,甚至「机      员自己设计及装配一架讯号产生器,结果相当满意,于
孔生烟 J ,经过细心的检查,发现线路的得接完全正确    是他要同学们也照样装配;结果呢!残酷的现实告诉他
,但是毛病又是从那里来呢?                 ,你是失败了。他的失败韭不是他的错,而是因为客观
  从以上种种困难的发生看来,我想应该归罪於线路      因素的影响,因为每个人的得接技巧不同,零件阻值的
设计者与装作者之间的矛盾。                 误差,而这一些在要求严格的线路中又怎能不出问题?
  一般上,一个线路设计者,他们所期望的是设计         综观以上各点看来,我认为当前的业余无线电爱好
一个符合需求的线路,于是,他开始根据这些条件来设      者,不应该为了只是要求装配;相反的,他应该更进一      "
计。由于一些特殊的需要,促使设计者在线路的设计中      步去了解线路,明了重点的所在,随时革备必要的修改
引用一些特殊零件,或者一些特殊的程序来调整,而这      ,只有这样,他才能成功地装配出一架满意的制作品。
                                                            '.j




些特殊的要求往往促使装作者面对更多的失败机会。       而在这过程中,他才能真正地学习到一些课本上所没有
  从这以上的矛盾看来,一位成功的线路设计者,不      的智识!




                             90
....
0>
You Are
             Dreaming!




                         1st Roku-Roku N.C.
                         Machine Around.




A Hydraulic
Copying Machine
                               93
Gas Cutti ng of Pi pes   Blind Man Detecting Refrigerant Flow


    Gas Turbine Engine




                                   Anything Funny!




»
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                                                                                                           , i;}0
                                                                                                       ?:>o
                                                                                                ,?>o><:f
                                                                                            ~,

                                                                                       .~~'l>
       (I   (M. loG. Welding)
                                            95
.,
            ~
            QJ
            C
            o
            Cl>
            ';:
            ~
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      ~           Cl
     w
     en
     Cl:
     w
     I­
     Z
     w
     ~
     ....
     ....
      Cl>
Not sure . . . . .
                                                    Refer to the Procedures
                                                    Again.
                                                                                                Let's Check and See.




                                                                                                             Designers
                                                                                                             At Work.

     Ol.l{ ShOOIf!d

     CI.lP




.)




                                            se~lCfI~                   Electronic Workshop
                             .   n   aflO                                 Practice
                        ~ eS'("


                                                            97
Graduation Souvenir Committee




 So Hong Hin
        Chiew Chong Yow
                   Chio Che Ooi
           Yeo Siang Kiang
   Chairman
          Editor (English)
                Editor (English)
        Editor (Chinese)




 Koh Han Chuan
       Hong Hock Chuan
                 Ong Tiam Teck
             Tan Chai Heng l

                    Asst. Business Manager
          Circulation Manager
   Asst. Circulation Manager

Business Manager





Chan Kham Hong                                                                    Lee Hing Guan

                          Lee Hoon Lai                Ng Yook Koong

 General Officer            Treasurer                     Auditor
                Photographer

                                              10'2
ACKNOWLEDGEMENTS


     We wish to express our sincere thanks to the following          The members ot the staff of the Mechanical En­
for helping us with the Graduation Souvenir.                  gineering and Electrical and Electronic Engineering Depart ­
                                                              ments for their co-operation.
     The following for their messages.

                                                                     The Students' Union and the Electrical & Electronic
      Dr. Lee Chiaw Meng, Principal, Ngee Ann Technical
      Engineering Society for their financial aids.
     College.

     Mr. Philip Limb, Vice Principal, Ngee Ann Technical
            All our contributors and advertisers.
     College.

      Mr. Chan Siew Poh, Head of Mechanical Engineering
             All those who have assisted in one way or another to
      Department, Ngee Ann Technical College.
                make this publication possible.
      Dr. Alan Phillips, Visiting Professor/Adviser of Mec

                                                          ­
      hanical Engineering Department, Ngee Ann Technical
            And to all those whom we have inadvertantly left
     College.
                                                out.
     Mr. Yeh Show Kun, Head of Electrical and Electronic

      Engineering Department, Ngee Ann Technical College.
           Thank you.
      Mr. Riley, Thomas Brian, Visiting Professor/Adviser

     of Electrical and Electronic Engineering Department,

     Ngee Ann Technical College.




                                                      103
Ngee Ann 1973 Graduation Souvenir

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Ngee Ann 1973 Graduation Souvenir

  • 2. CONTENTS MESSAGES 3 ADMINISTRATIVE STAFFS 6 IVIECHANICAL ENGINEERING DEPARTMENT STAFFS 11 ELECTRICAL AND ELECTRONIC ENGINEERING DEPARTMENT STAFFS 23 PHOTOGRAPHS OF ENGINEERING DEPARTMENTS' GRADUATES 35 ARTICLES ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 87 MISCELLANEOUS 91 GRADUATION SOUVENIR COMMITTEE 102 ACKNOWLEDGEMENTS 103
  • 3. Message by Dr. Lee Chiaw Meng, President " After three years of hard work you have now success­ fully completed your studies and are ready to make con­ tributions to society. In design'ing your courses of study, the College has taken care of the actual needs of industry and the business world with which most of you will be associated for the greater part of your working life. The practical aspects of the course syllabuses and the opportuni­ ties you were given to participate in orientation programmes in industrial, commercial or other establishments are the main features aimed towards this end. You have also been educated in bi·lingual environment so essential in a multi­ racial society like ours in Singapore. You can be sure, there­ fore, that you are placed on a firm footing at the very start when you step out of College, Those who graduated before you have obtained mea­ ningful employment without difficulty, and you will no doubt find yourselves in the same advantageous position. This confidence that the public have placed on us is most encouraging, and it is for you to up-hold this con­ fi dence and the good name of the College. Principal Or. Lee Ch iaw Meng fl5G* $ag~it± 3
  • 4. MESSAGE BY MR. PHILlP LIMB During your time at Ngee Ann you have worked hard, learnt many thin!Ji and acquired new skills. You are now fitted to take your place in the skilled workforce of Singapore. That workforce will need to become more skilled, so although you have done well, you cannot rest on your laurels. You will need to continue to learn as you work, and this will represent a real challenge. I am confident that you will be able to meet it. Congratulations on completing your course and my best wishes for the future. /1 ILL, U Vice - Principal Mr. Philip Limb ~~ fl3t *: 5
  • 5. a: <l: c a: .­ f-"" (/) Cl - <.9~ .~ w U a: QJ f­ 3 ~ ~ (/)~ ~
  • 6. Z => w <..:J <{ => C'l <..:JZ Z . <{Cl? ....J~ :r:~ ( f )0 _ ­ ....J::2: <..:J • Z ~ w::2: u.. o Cl o <{ Z :r: . ~-tI w :r: <{~ - +-' ,H- ~ a::: Q.l <{ a::: ~ C'l Cl> ~~ ~::2: -W-:n:( ....J . '" ~ ~. •
  • 7. v LU u -- ~ z « Cl c Z '" ~ -:tH -- - ::J LL..r:: ~ -­ ~U ~ C (/):.= .- wtI * (/) U «~ ~ CO ~~ ~ ~ ~ UJ -:tH Cl ~ Cl «UJ c ~ ~ W Cl « ~ ~t: --:- f- (/) -­ U.:>t. «~ Cl '" wtI C ~ ~ (/)~ « ... ~ ,:: ,.... Z~ ~ Cl ~ « ~t:
  • 8. (/) ..­ .­ (/) 0: « u. rur 0: « u. n17 u. « f- c .~ u. « ~ * *~ Q) g> wo Z o ._ :J ~~ f- Z w~ Q) :::> f-f­ co 0,;,,: :::> 0 ~~ (/) 0 --$ f-~ --~ -~ (/) Q) ....,: ..: wt ~ - Q) • ...J ~~ ti; ..: wtl§I « 1!@: ~~ Z ~ ~~ Z ~ 0 ~ ~ ~ « ~~ 0 « ~~
  • 9. U1 LL LL « ~ ? U1 I­ Z W ~ I­ ~ « D.. W o • w • ~
  • 10. MESSAGE BY MR. CHAN SlOW POH Congratulations - your period with us has been re­ warded by the successful completion of your course of study. Recently, some of our "old boys" have visited me at the College and have mentioned that what they learned here was not sufficient for them to cope with their jobs. They said that in view ofthis they would like an opportunity for further study. I would like to point out that our main objective is to provide a foundation which will enable you to embark on your career with confidence. However, it would be a fallacy to think that in three years we can equip you to handle all the problems encountered as a technician engineer. Experience and knowledge are essential requirements to be successful in any profession. It is in the working environment that practical experience is gained, whilst at the same time further knowledge can also be acquired "if you wi 11 put your mi nd to the task. It is not al ways necessary that further ". study must be undertaken in.a formal way. I am confident that the foundation which we have laid here at NATC will enable you to pursue any further knowledge through self HEAD OF MECHANICAL ENGINEERING DEPARTMENT study. Mr. Chan Siew Poh To conclude, may I send you all my best wishes for the future. tJL~.If£*£1:f ~* f{l m5t 1. 11
  • 11. VISITING PROFESSOR/ADVISER OF MECHANICAL ENGINEERING DEPARTMENT Dr. Alan Phillips ;fJL ~ .I tt ~ ± if ( $ E[ ) MESSAGE BY DR. ALAN PHILLlPS In response to your request for a message, I am taking his skill and technique in the live situation on the road. this opportunity to convey my congratulations to those Engineering students graduating for the NATC Diploma. You will, I hope, set forth into industry armed with the knowledge you have already gained here, but you must This is for you the cui mination of three years hard go there expecting to find an environment which will test ~ endeavour, studying to attain this award. It is not only a you in many different ways. Industry is a situation in which test of your ability to learn the essential knowledge which there are many problems to which practical solutions are will be the foundation for your future career as a technician required. It is in this environment that you will find your ­ engi·neer but also of your competence to pass the numerous selves and gain valuable experience together with financial examinations along the way. reward for your la bours. I feel that an analogy can be made to that of a learner I wish you all well in this new and challenging venture driver who has just passed his driving test and is given his into the Industrial Society. certificate of competence. He must now set out to improve 13
  • 12. a: L.U a: C ::J E- ~ a: ~ ..c -=-- L.U ..c f- Cl) ~ a: c E­ Cl U ell "$ ~ en -=-­ L.U S $ f- '" "$ '­ ....J u I .:>t: $$ L.U -0 0 >- 1nr! ~ a: ::J 'ro ~ ....J C 0: 19 ~ '- 0 Z L.U ~ z '­ 1nr! <t Cl) L.U ~ Cl)
  • 13. ~ ~~~ J
  • 14. cc w '" cc Q => Cl e l- U W ~ ....J ~ ~ E en ::i en CD ~ ~ Cl e -:tl1 0::: ~ CC W .J:: It:­ CC '" -=-­ ~~ LL. => 0 I­ U 0 ....J 'I'-" ~ W ', ....J ~ ~
  • 15. LECTURER (PART TIME) Mr. Kan Siew Tong i#ViP ( :l: M ) ~~~jt!£ SENIOR ACADEMIC INSTRUCTOR #> Mr. Soo Kia Hua ~ ~ ;f~ %- P1 rfJ*-~jt!£ 17
  • 16. a:: a:: 0 0 c ~ U Cl c 0 ~ ~ u r ::J -t CO ::> r ::> a:: c nE ~ a:: Ql N nE ~ ~ ~ ~ :E ~ (J) (J) Z - u n1V~ Z - Cl c n1V U Cl c u '" ..c. ~1II ~ ~f 0 U ~ ~ Ql ~ ....J E * UJ UJ 0 « ~ ~ 0 « "C ~ U u « «
  • 17. <:' ACADEMIC INSTRUCTOR Mr. Pao Mee Kuong t~ ~ Ft tL!k7tjt!t • ACADEMIC INSTRUCTOR Mr. Chan Puan Jui t~ ~ Ft ~~fe.jt!t 19
  • 18. ., ACADEMIC INSTRUCTOR Mr. Thong Foo Kong ~m1tj:;1- CADET ACADEMIC INSTRUCTOR Mr. Hoon Heng Jow f~ % §l ~~Ji5t1- 20
  • 19. t' .. Mr. Keith Hargreaves V.S.O. AI":. ---­ VOLUNTEER SERVICE OVERSEAS SENIOR ACADEMIC INSTRUCTOR ~ Mrs. Christine Tan San Yee (ENGLISH LANGUAGE UNIT) %J~~*± 21
  • 21. MESSAGE BY MR. YEH SHOW KUN Over the last three years you have not really learnt very much. You have, however, learnt sufficient amount HEAD OF ELECTRICAL & to enable you to learn more. What is more important is that you have now been trained to be able to learn more. ELECTRONIC ENGINEERING DEPARTMENT Mr. Yeh Show Kun There is an abundance of knowledge waiting for you. You can learn something every day, only if you make a point to learn. You do not learn from the books only. You It {Jl. & It -f .r- t[ 1I-f;4f:h¥1b1:. * .t- 1£ learn from your work and the people around you. When you leave the College, you are beginning a new phase of life. Let it be a fruitful and pleasant one. ) ,~~~}L_(_~ Yeh Show Kun 23
  • 22. MESSAGE BY MR. T.B. RI LEY VISITING PROFESSOR/ADVISER I amsure you will feel jubilant now you have qualified. OF ELECTRICAL & ELECTRONIC hope you agree that your effort was well worth while. ENGINEERING DEPARTMENT Congratulations! Now you are in top gear so to speak it Mr. Riley, Thomas Brian should be possible for you to maintain the pace in your next assignment. You have proved your ability yet you 1t~,&.It-=fI.ff-*3:.1f cannot rest on your laurels. (:tlf.) • Wherever you go from here contribute while still learning and set a standard of excellence which will inspire o'h'" folio";", yo, 'hm"h ,h;, COII'~~ IT.B. RILEY) 25
  • 23. ID N a: w ~ a: U :::> .3 I- Ql U ~ W 0 ...J >­ I c a: '" o 6 z . ~ ~
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  • 25. ~ ~ .., co et: w e Cl I-E­ ~ et: '=' => :E u -=" ~ -:t to N l- U Ql $ et: co u. w ....J Ql >- ~ w Ql Ql ~ et: I- I-E­ ~ => '- ~ ~ Cl "=' I- e U >­ $ ~ ~ W ....J w .: ~ =~ ~
  • 26. '" ~ "0 a: c W '" a: ..c ~ (,) ::J ~ I­ a:l U '" $ w en c -:t ...J ..: a: '" ~ w i= ~ en N a: <1l fE­ I ::J l- Cl -=-.. ffi c U w 0 $ ~. ...J ~ ~ H-
  • 27. ASST. LECTUER Mr. Ooi Tian Hock !lb J! i;Jt ~ $!~~~!t SENIOR ACADEMIC INSTRUCTOR Mr. Leow Whye Siang ~ ~ ;J~ %- ft ~ 'tf ;f.f ~ 1:­ 30
  • 28. SENIOR ACADEMIC INSTRUCTOR Miss Wang Yea Ping ~ ~ t~ %- fft 3:. 3E ~ ;J ftll. SENIOR ACADEMIC INSTRUCTOR Mr. Tang Kee Chi ~ ~ t~ %- fft M;-t~jt!£ 31
  • 29. SENIOR ACADEMIC INSTRUCTOR Mr. Tan Siak Teng @ Tan Siak Cheok i%J ~ f~ ~ ~ I*~~~!£ SENIOR ACADEMIC INSTRUCTOR Mr. Sitoh Chong Hon ~ i%J ~ f~ ~ ~ ~ 1t 1~ jx.. ~ !£ 32
  • 30. .. ACADEMIC INSTRUCTOR Mr. Tang Kim Seng t~ ~ ~ ~~ f: !£ 5t !£ ACADEMIC INSTRUCTOR Mr. Tan Yew Kin • ~~ ;;fr ~ 5t !£ t~ ~ ~ 33
  • 31. a: 0 I­ <.> => ~ v a: Q) Q) nE( ~ M I­ ~ (/) Cl Z c: w n1V ~ <.> .r= ~1l1 ~ w 0 t9 ~ ~ Cl .: tlJ< « <.> ~ «
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  • 38. KOH HAN CHUAN ~ jX )I! 138-G, Stagmont Ring Si ngapore 23. , Lee Chyi :$ * 51, Jalan Burgar , Si ngapore 24. 41
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  • 43. ... TAN YEW TENG <' ~* 711 ~ 2290, Satu Serendam, Malacca, WANG KOK HENG £00,* 16A, Jalan Haji Manan, Kluang, Johore, Malaysia. 46
  • 44. WONG MUI TONG :t ~ It 132-E, Jalan Alsagoff, Singapore 14. YEaH ENG CHIANG ~St!§ 35, Main Road, Lukut, Port Dickson, Negri Sembilan, West Malaysia. 47
  • 45. YONG CHO YEIT .... ;fh 1£ ~ AG·12, Suleiman Court, .'t Jalan Tuanku Abdul Rahman, Kuala Lumpur, Selangor, Malaysia. "The important thing in life is not the triumph but the struggle. The essential thing is not to have conquered but to have fought well" CHAN KHAM HONG ~* iX * 220, Main Road, Rengit, Batu Pahat, " Johore. . 18·A. Jalan Petua. Jurong Road gy> ms. Singapore 21. 48
  • 46. CHIA YONG SIAN ~5R~ 25-F, Upper Bukit Timah Road, 7'1.. m.s., Si ngapore 21. "Success is counted sweetest by those who never succeed to comprehend a nectar requires sorest need" CHUA YAP SOON • l1f jlWi 2-A, Jalan Merbah, Batu Pahat, ,) Johore, Malaysia. 49
  • 47. .... z ~ .... $: :J :c '" <I> <1> ­ .... <1> "~ '" > u ~ en :J <1> ~ co ~- *: ~ u C ~ 0 ~~ <1> ~ LO <I> a. :I£ 0 :c ., <1> ~ <I> .~ <I> Cl .... <1> a. W <.9 Z .t£ ~- I1l <.9 .r: ., 0 E 0 -=:t ~~ :c ~*" <1> 1--+ ~ <1> ";;; .i > lilW l±J'Ilt!: -0 <1> ~ :c .= ~ <1> O.t£ :c c ~ ~ ±1t­ =­ <1> co ., l+R .... -=:t L-­
  • 48. <:J Z ~ 3: ~ <:J Z o o (/) w W -l vi C1l ... > £:) Z <t: I 0 f= .EH Cl c: N ... C1l Ln ~ 0 lEiI: ~ 0 C. ~ ~ '" Cl w w -l * E C1l (/) 0:' c: en 6 «Xl J
  • 49. L1M CHENG HOCK *JR;f& Chop Kean Seng, Talang, Kuala Kansar, Perak, Malaysia. ''The twin purposes of education ­ inspiration and information." L1M ENG SENG * ~fi] ~ Blk. 43, 1030-G, Bendemeer Road, . Singapore 12. A 52
  • 50. LYE SHOON KONG ~ )I~ :7't 146, Queen's Crescent, Singapore 3. NG YOO K KOONG 1t1l~ 236, Kedah Road, Parit Buntar, Perak, Malaysia. 53
  • 52. .... TAN L10NG KIAT Jr*£W 5696-C, Batu Berendam, Malacca, Malaysia. TEY ENG KIAN ~ 71t ~ 47, Kg. Abdullah, Segamat, Johore, Malaysia. 55
  • 53. TEY KOK POO ~OO~ 320, Bukit Pasir, Muar, Johore, Malaysia. YAPYU pt "ff.. 27, Jalan Beringin, Melody Garden, Johore,Bahru, Malaysia. 56
  • 54. <.9 0 (J) z ~ en .., ~ 0 ~ Qj Z en Q) c 0 Z :> 'i:: ~ (J) mm ... 0 a. Cl 0 '" en • <.9 ...J c ... z ~ x· ...J ~ Vi <.9 z cv) w ,... w '" ~ Q) J: u ~ '<:t ll) 0 J: ~ ~ c 0 a. Z jJiI E a c ~ E 0 Vi J: u u ,..." (Xl M
  • 55. CHONG CHIEW KIANG *{klt 507-J, Kampong Lapah, Tranquerah Garden, Malacca. Malaysia. CHUA CHUAN HONG .4--$ 34-K, Pulau Ketam, Selangor, Malaysia. ." 58
  • 56. "" GOH KONG LING *.". 864, Penda Maran, Pelabuhan Kelang, Selangor, Malaysia. LEE CHING YEEN *.iIk.l 4-4A, Lorong Loke Lim, Tasek, Perak, Malaysia. 59
  • 57. <.:) z E ~' ~ >= ~ 0 C 0 <.:) a::: ..., > Cl.. Cl ~ 0 '" 'v; Z ~ ~ Cl ci­ w en c c '" '" 0 lD a '" ~ <.:) ~ z w '0' w ~ 00' Lt) E ~ ~ '" cri w en~ ~ a:: 0 Cl ..J <.:) '­ Z 0 ~ ... '" c 0 0­ S Q '" Cl ~ C ~ W .,f en '<t w ..J
  • 58. --, $ IlJ1! I -L " '" 0 ~ a: ~ ~ 0 0 '" E ~ N ID! ::I: !~ F .... .,; Ql ~ -d z ~ E 0 c. :s: '" « ~ ..., 0 0 ~a: M mt l­ ::J ce ~ I' '" Cl C en * ~ c <.9 Ql ­ ~ 2i. ~ co UJ ~ C Cs Z C> c. ...J :J {(~ C. C/) '" UJ*I-~ UJ - c <i. ~ C") ...J LL .­ C") cC/) ~ N L
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  • 71. LEE HING GUAN :$Jt~ No. 2, Main Road, Jerteh, Trengganu, Malaysia. LEE HOON LAI *~* 126, Jalan Parit Mesjid, Pontian, Johore, Malaysia. 73
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  • 79. TAN YOKE CHIN ~* *:Ut 20, Kampong Anam, Bachang Road, Malacca, Malaysia. TAY JUAY HIONG ~1Jti.1t 8-B, Jalan Cherah, " Singapore 20. 80
  • 80. -c­ « ~ 3: a:: c ID ::I: (.::J ¥­ '" :J ID ~ Z 0 ~ :>! CS a. ~ '" '" en .S:Cl * w 0; W 3: c 0 W «­ Cl) '5 cv) N ::I: u ~ c N I­ M a.. ... ID ID CXl ~ c a. (.::J 0 Cl Z 0 ... '" 0 Cl ~ u.. 0 C (.::J ....J en Z ai w M I-
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  • 82. ~ 1-­ w I-~ '" '" o ... ,,- .:,i eO • I 0 E Z w -- I cf *< CC .~ .-..r::. -'" c - I0 >­ '" ..r::. M I- ~~~ *' :J <..? '" ~ u. N <..?1m ~ - a. .­ Z Ql Z co(/') M c 0 Cl 0 w ~ 0 a. 0 :s: .~ -#2 00 -l <..? z 0 0 '" Cl :m I-l- .S Lb (/') * m~ ~W :s: '<t m~ ... ~$ ... 1F R ~ ~* ~~ ~~ ~~ ~~ ~~ l.­
  • 83. -, YEO SlANG KIANG '.:I ifb ~ ~~ 36-B, Jalan Teck Kee, Singapore 19. YEOH ENG TEIK ifb 5R {~ 465, Penang Road, Penang, Malaysia. Tel: 62275. 84
  • 84. ai > .-= 0 ClJ t9 .':: M Z ~ LO -I ~ ~ ClJ Cl co z E a. UJ :::> ~ '" '" ~ c Cl ~ >­ t9 en r3 N
  • 85. By Wong Kok Heng/Mechanical Engineering ADAPTIVE CONTROL When we say that we have something "Under Control" employed in industry could be increased substantially, with ... we mean that we know what we intend to do, and are confident that we can see that it does. Therefore, any very considerable imporvements in the profitability of machine shops. This is particularly true of batch production control system will have the essential features, as follows:­ shops employing numerically controlled machines. It is believed that conventional machines take too much time (a) There is a plan. on toolssetting and work accuracy will be depending on (b) We prepare to carry out that plan. specified geometry and operator skill. Numerical control (c) We compare what is being done to what is being aims to overcome this by specifying component geometry done to what is being planned at all time. on a tape which then operates the machine automatically. (d) Instructions would be 'feedback' when any deviation Since feedrates are also specified on the tape, job durations occured and we return to the plan. are more accurately forecast at the planning stage. Hence, the essence of any control system is this The metallurgical properties of workpieces which constant 'feedback' of instructions so as to correct any influence acceptable maximum machining rates are unpre­ deviation from plan. Everytime the control system detects dictable and variable. Cutters are subjected to· variations. deviations, it sends instructions back to the control, and Since cutting speeds are determined by the planner before corrective measures would be taken immediately on receipt the event, machining rates with numerical control must of these instructions. make adequate allowance all the time because no metal is homogenous throughout. This raises limitation on the ulti ­ INPUT J .1 INPUT CONTROL ... UNIT -- PROCESS rOUTPUT mate economics of numerical control, and put forward the question of ADAPTIVE CONTROL. CORRECTIVE I j ACTION In recent years, great emphasis has been placed on optimum machining. However, to successfully achieve this ',," JFEEDBACKJ-. goal presents many difficult problems. The latest and most promising approach has been adaptive control. Fig.1 FEEDBACK PRINCIPLE. The work "adaptive" is borrowed from biology which abounds with examples of adaptive system. A person makes It is generally accepted that the metal-cutting rates .a fairly rapid move from sea level to 10,000 ft. altitude, 87
  • 86. experiences some discomfort the first day, due to the rather Obviously, under any of these conditions, a conven­ substantial decrease in oxygen. However, the adaptive con­ tional feedback control system is no longer indifferent to troller of his body go into automatic operation, and in a variations, and system performance soon degrades to-beyond matter of a few days, the oxygen-carrying capacity of the acceptable limits. blood is raised to suit the body in the new environments. If the altitude change had occured so slowly that adaptive There are always at least two elements that always " processes had kept pace with the changes, then the period appear in some form in adaptive control systems. of discomfort would be avoided. (1) Identification - - - ­ which refers to the measurement In a broad sense, any system in which a parameter is of the dynamic characteristics of the process to be '" adjusted to counteract a degradation in performance, controlled. brought a bout by a change in the system's environment could be called adaptive. In this sense, there are hundreds (2) Actuation - - - ­ which signifies the generation of of adaptive control systems in present-day operation. Al­ an appropriate actuate signal, which in turn modifies most every jet-aircraft fuel control is temperative com­ the adjustable characteristics. pensated, for example. Identification is probably the most important aspect of adaptive control, and is the central element of such a system because adaptivity implies frequent, automatic, and t rapid solution of the identification problem. JNPUTS CONTROLLING control 110UTPUTS ELEMENTS signals lPROCESS I ..... And Actuation acts upon information about the present system performance, and the desired or optimum performance, to decide what corrective measures to take, Adjustment Signals and to determine the required controller characteristics. It also acts upon the decision taken, and initiates the required IDEAL STRUCTURE OF ADAPTIVE CONTROL. modification so as to drive the system towards the optimum. In the metal-cutting industry, the concept of adaptive An adaptive control system is required when a con­ control means that the tool can react for the optimum ventional controller cannot work. For example, a controller advantage to unpredictable changes in cutting conditions. might be required to compensate for such things as: An operation usually selects speeds on the conservative side (a) Changes in the process transfer function, or in para­ to avoid risking damage to the part on machine. Adaptive meter value, with changes in its environment, example control, on the other hand, responds to the actual cutting an aircraft's transfer function changes with air speed, conditions. When the tool is sharp and the workpiece not height, air pressure, temperature etc. too difficult to machine, the speed will be high, but as the tool becomes dull or hits hard spots the automatic control (b) Changes in the system itself, example wear, mechanical will cut the speed back to suit the cutting conditions. In failure. this way optimum production rate can be maintained. 88
  • 87. Initial speeds and feeds do not have to be carefully 3) 'Proceedings' of IEEE. 1840, July 1970. chosen. Sensors, usually based on spindle torque, tool 4) Handbook of Automation, Computation and Control. vibration and tool tip temperature, will feed the required 1) By Eugene M. Grabbe information back to the performance measurement com­ puter. The computer calculates the metal removal rate, tool vvear rate, and surface finish. When this information is received, the controller will modify the initial feed and speed to opti mize the overall machining performance. There are disadvantages to adaptive control which must at all times be borne in mind. Generally, an adaptive control is necessarily complex and expensive. It should be remembered that adaptive control can hardly be justified, and should not be used unless parameter variations are wide and unpredictable. position Programmed commands N. C. machine output feeds, speeds, System . tool & tool positions corrected feed and speed sense Feed & speed parar correction (vibr "'"'­ ADAPTIVE I-- torql CONTROLLER tip-t l e etc. ADAPTIVE CONTROL SYSTEM ~ Reference: 1) System Identification For Self-Adaptive Control. By W.D.T. Davies 2) System Engineering Handbook. By Robert E. Machol 89
  • 88. 我萦馀缘路放言十典梨作之间的困戴 李海宝 F 。 大多数的业余无线电爱好者都会遇到一些问题,当 应该是为了达到目的,而使出种种设计上的怪招,非那 他们怀着满腔的信心与期望,开始根据什这所登载的线 种零件,那种调整步骤,否则的话,一切将化为乌有! 路去购买零件,立在备挥接工作时,忽然发现到某些零件 相反的,他们应该考虑到一些零件规格的误差问题 ,在本地无法买到,或者是有这些零件,但是规格不相 市场的供应问题,装配程序问题,否则. ,当设计者把线 同。於是,他们开始镑徨,是否可以买?或者是否可以 路装好时,将是第一个面临失败者! 更改线路,团团的疑云,使到他们的信心动摇,终於放 对於业余的装作者们,他们所期望的是根据什读中 弃了!也有些人千辛万苦终於把零件找齐了,根据什诚、 「好效果的制作品 J ,将会在自己的仿制品中出现,然 中的制作,他们本该获得所需的效果,但是,当他们试 而现实往往会使到他们失望,我曾经看过一个工场指导 验的时候,不是整架不能工作就是毛病丛生,甚至「机 员自己设计及装配一架讯号产生器,结果相当满意,于 孔生烟 J ,经过细心的检查,发现线路的得接完全正确 是他要同学们也照样装配;结果呢!残酷的现实告诉他 ,但是毛病又是从那里来呢? ,你是失败了。他的失败韭不是他的错,而是因为客观 从以上种种困难的发生看来,我想应该归罪於线路 因素的影响,因为每个人的得接技巧不同,零件阻值的 设计者与装作者之间的矛盾。 误差,而这一些在要求严格的线路中又怎能不出问题? 一般上,一个线路设计者,他们所期望的是设计 综观以上各点看来,我认为当前的业余无线电爱好 一个符合需求的线路,于是,他开始根据这些条件来设 者,不应该为了只是要求装配;相反的,他应该更进一 " 计。由于一些特殊的需要,促使设计者在线路的设计中 步去了解线路,明了重点的所在,随时革备必要的修改 引用一些特殊零件,或者一些特殊的程序来调整,而这 ,只有这样,他才能成功地装配出一架满意的制作品。 '.j 些特殊的要求往往促使装作者面对更多的失败机会。 而在这过程中,他才能真正地学习到一些课本上所没有 从这以上的矛盾看来,一位成功的线路设计者,不 的智识! 90
  • 90. You Are Dreaming! 1st Roku-Roku N.C. Machine Around. A Hydraulic Copying Machine 93
  • 91. Gas Cutti ng of Pi pes Blind Man Detecting Refrigerant Flow Gas Turbine Engine Anything Funny! » , , i;}0 ?:>o ,?>o><:f ~, .~~'l> (I (M. loG. Welding) 95
  • 92. ., ~ QJ C o Cl> ';: ~ co ~ Cl w en Cl: w I­ Z w ~ .... .... Cl>
  • 93. Not sure . . . . . Refer to the Procedures Again. Let's Check and See. Designers At Work. Ol.l{ ShOOIf!d CI.lP .) se~lCfI~ Electronic Workshop . n aflO Practice ~ eS'(" 97
  • 94. Graduation Souvenir Committee So Hong Hin Chiew Chong Yow Chio Che Ooi Yeo Siang Kiang Chairman Editor (English) Editor (English) Editor (Chinese) Koh Han Chuan Hong Hock Chuan Ong Tiam Teck Tan Chai Heng l Asst. Business Manager Circulation Manager Asst. Circulation Manager Business Manager Chan Kham Hong Lee Hing Guan Lee Hoon Lai Ng Yook Koong General Officer Treasurer Auditor Photographer 10'2
  • 95. ACKNOWLEDGEMENTS We wish to express our sincere thanks to the following The members ot the staff of the Mechanical En­ for helping us with the Graduation Souvenir. gineering and Electrical and Electronic Engineering Depart ­ ments for their co-operation. The following for their messages. The Students' Union and the Electrical & Electronic Dr. Lee Chiaw Meng, Principal, Ngee Ann Technical Engineering Society for their financial aids. College. Mr. Philip Limb, Vice Principal, Ngee Ann Technical All our contributors and advertisers. College. Mr. Chan Siew Poh, Head of Mechanical Engineering All those who have assisted in one way or another to Department, Ngee Ann Technical College. make this publication possible. Dr. Alan Phillips, Visiting Professor/Adviser of Mec ­ hanical Engineering Department, Ngee Ann Technical And to all those whom we have inadvertantly left College. out. Mr. Yeh Show Kun, Head of Electrical and Electronic Engineering Department, Ngee Ann Technical College. Thank you. Mr. Riley, Thomas Brian, Visiting Professor/Adviser of Electrical and Electronic Engineering Department, Ngee Ann Technical College. 103