背景 : 臨床工学技士養成校の学生にユーザビリティ (製品の使いやすさ) 評価演習を行い, その妥当性を検証した.

方法 : ユーザビリティの評価観点 (知覚, 認知, 行動, フィードバック) を講義後, 学生に家電製品を評価させ, 自由記述で記録させた. 演習の妥当性検証では 59 名の記述を評価観点で分類した.

結果 : 学生は平均3.2個の評価観点を用い, ユーザビリティについて平均5.6個の評価をした. 評価観点のうち認知 (情報の分かりやすさ等) の評価数が平均2.2個と最も多かった.

考察 : 学生は多様な観点で家電製品を評価できた. 使い慣れた製品では発見が難しいとされる認知的問題を学生は複数発見でき, 本演習は妥当だったと思われる.

　High-frequency isolation transformers are used to suppress high-frequency leakage currents in insulated parts of medical equipment. In this study, the coil-to-coil capacitance and power transmission efficiency of a high-frequency isolation transformer were analyzed and measured by changing the winding method of the coil on the ferrite core, with and without PTFE, and the material of the core. The results of the electromagnetic simulation showed that the maximum power transmission efficiency was 99.27 % for the N87 equal winding without PTFE and with PTFE, and the minimum coil-to-coil capacitance was 6.9267 pF for the N87 concentrated winding with PTFE. In the actual measurement, the maximum power transmission efficiency was 98.919 % for the N87 equal winding without PTFE, and the minimum coilto-coil capacitance was 4.3924 pF for the N87 concentrated winding with PTFE.