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SystemScan 2014
Mine担当分
Q1: DNA! 問題文
 シールド無しツイストペアケーブルの略語(アルファベット3文字)を答えよ
Q1: DNA! 模範解答
UTP
 Unshielded Twisted Pairの略
 合宿最終日のLANケーブル工作実習
 「シールド無しツイストペアケーブル」でググると出てくる
 (正確には「シールド無しツイストペア」でUTP)
Q1: DNA! 得点分布
0
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未回答 0 15
人数
点数
Q2: Digitization 問題文
 デジタル化に必要な手順を2つ答えよ
Q2: Digitization 模範解答
標本化と量子化
 「LANケーブル工作実習」の予習スライドにあった
 ググっても出てくる
Q2: Digitization 得点分布
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未回答 0 10 20
人数
点数
Q3: Classification of the signal 問題文
 以下の中からアナログ信号を選べ
 ある地点での気温の推移
 日本の人工の推移(国勢調査に基づくと仮定)
 f(x) = 3x
 f(x) = 3x, x∈N(自然数の集合)
 ちなみに、挿絵はリーマン・ショックの時の日経平均株価の推移です
 「人工」→「人口」
 このスライド作ってる時にはじめて気が付きました…申し訳ありません
Q3: Classification of the signal 模範解答
 ある地点での気温の推移
 定義域: 時間 値域: 気温 どちらも連続な物理量
 日本の人工の推移(国勢調査に基づくと仮定)
 人口は整数しかとりえない。値域が離散
 f(x) = 3x
 定義域も値域も実数
 f(x) = 3x, x∈N(自然数の集合)
 定義域を自然数に絞ったため離散
Q3: Classification of the signal 模範解答
 「LANケーブル工作実習」の予習スライドとか https://gitlab.npca.jp/textbook-
production-team/npca-textbook/raw/master/textbook.pdf (要ログイン)の
第IX部第2章とかに信号に関する説明がある。
Q3: Classification of the signal 得点分布
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未回答 0 20
人数
点数
Q4: Dance! Dance! Impedance! 問題文
 インピーダンスの単位を選べ
 A(アンペア)
 V(ボルト)
 Ω(オーム)
 kg(キログラム)
 J(ジュール)
Q4: Dance! Dance! Impedance! 模範解答
Ω(オーム)
 ググろう
 複素数の値を取る。交流回路で超便利な概念。
Q4: Dance! Dance! Impedance! 得点分布
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未回答 0 20
人数
点数
Q5: Surface 問題文
 交流電流は周波数が上がると、銅線の表面付近に電流分布が偏る。このことをな
んと呼ぶか答えなさい。
Q5: Surface 模範解答
表皮効果
 「表面 電流 高周波信号」とかでググるとわかる
 若干求められるググ力は高め
 細かい原理は各自調べよう
 キーワード: 渦電流
Q5: Surface 得点分布
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未回答 20
人数
点数
Q6: パケットぴょんぴょん! 問題文
 IPによるルーティングではパケットがルーターの間をぴょんぴょん飛んで行く(?)
事により情報を伝えます。この時、1つのパケットが伝送される際に中継したルー
ターの数をなんという?
 「ぴょんぴょん」
 (問題文下に表示されていたチノちゃんの画像はヒントです)
Q6: パケットぴょんぴょん! 模範解答
 ホップ数(英語で”hop number”)
 hopは「ぴょんぴょん跳ぶ」という意味
 みんなも辞書で引いてみよう
 「ご注文はうさぎですか?」の第四羽で赤い石畳の上をジャンプして渡るイメー
ジ
Q6: パケットぴょんぴょん! 得点分布
0
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未回答 0 20
人数
点数
Q7: 世の中すべて波だらけ 問題文
 現在、IEEE 802.11nの無線LANシステムが普及し始めている。そこで採用されて
いるMIMOの主要技術でもある、複数のアンテナからそれぞれ適切な位相の電波
を発射することで電波の向きを調整し、通信品質を上げる技術をなんというか。
Q7: 世の中すべて波だらけ 模範解答
 ビームフォーミング(アダプティブアレイも可)
Q7: 世の中すべて波だらけ 得点分布
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未回答 0 20
人数
点数
合宿お疲れ様です
 熱中症には気をつけて、夏休みをお過ごしください。
 私について
 http://ぴょんぴょん.jp/

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SystemScan 2014