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고교 교육 과정에서 제6차와 제7차 과학(물리) 교육의 교육 목표와 교육 내용에 대한 비교·분석
정윤근,조금열 여수대학교 2002 論文集 Vol.17 No.-
A comparative analysis was done on the 6th and 7th Science(Physical) Education Curriculum of Korea high school. The results of this study were as below:(1) On the educational objectives, the general object is changed from the ability solving problem creatively to the fostering of student's view of nature correctly. Also, the pattern of statement is changed from the viewpoint of teacher to that of student, Therefore, the education to improve student's whole personality is emphasized. This object is consistent with the purpose of the curriculum for students. (2) In contents, the variation of introduced concepts is minor, but the movement of concepts among academic years is significant. Generally, the concepts are moved from low to hight grade. The inquiry area is divided into inquiry process and inquiry activity, but the inquiry factors according to subjects are not established. Owing to the introduction of deep and supplementary education process, the comment about extent of evaluation is added, but the reference about performance assessment is not found.
R-134a를 사용한 자동차용 스크롤 압축기의 스크롤 형상변화가 성능에 미치는 영향
이건호,김학수,조금남,유정열,Lee, Geonho,Kim, Haksoo,Cho, Keumnam,Yoo, Jungyul 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.11
The present study investigated the effects of geometric parameters considered on the performance of an automotive scroll compressor by assuming ideal, semi-real and real gases for R-134a. The geometric parameters were center thickness of scroll, height of scroll and the size of discharge port. Fourth-order Runge-Kutta method was applied to solve the thermodynamic equations, leaking rate equation and the equation of motion of discharge valve for ideal, semi-real, and real gases. The volumetric and adiabatic efficiencies for semi-real and real gases differed little, but those for ideal gas differed by 18% and 25% compared with those for real gas at 2,000rpm. The volumetric efficiency changed little as the design angle of scroll (${\gamma}$) changed, but the adiabatic efficiency at ${\gamma}$ of $34^{\circ}$ was higher by 2.4% than that of $147^{\circ}$ for 2,000rpm. The volumetric and adiabatic efficiencies at scroll height of 29.8mm were higher by 1.7% and 2.8% than those of 65.8mm. The volumetric efficiency changed little as the size of discharge port changed, but the adiabatic efficiency increased a little as the size of discharge port decreased.