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洪奉植,朴鏞寬 大田工業高等專門學校 1969 論文集 Vol.4 No.-
This paper discussed about the automatic voltage regulator by the method of feedback control system. The regulator containing 3 tubes 6Y6, 6SJ7 and VR-105, and the feedback network, consisting of R_1, R_2, and R_v, determines operating condition of 6SJ7, and then 6Y6, so that the output keeps up 220V, whatever the input voltage is between 290V and 370V.
홍봉식,김태균,오승엽,김환우,권오석 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(A)
The currenty offered experiment courses are completely reconsidered and reconfigured. The whole subjects are divided into 10 seperate courses, each of which should represent either basic or advanced stages of differing fields of the electronic engineering. It has been aimed that the courses form an elaborate hierachy so that they are minimally redundant but linked to one another in their fringes. Also, it has been pursued that the new courses should not fall obsolete in at last next five years exploring the maximum possibilities of the currently available equipments.
정신과학 임상실습 후 의학전문대학원생들과 의과대학생들의 환자중심태도 변화 비교
홍봉식,서정석,김동욱,문석우,김태호 한국의학교육학회 2009 Korean journal of medical education Vol.21 No.2
Purpose: The aim of this study was to compare patient-centeredness changes between medical school graduates and medical students after a psychiatric clinical clerkship. Methods: We focused on 40 medical school graduates. We received permission to use data from a 2006 study on patient-centeredness of 94 medical students. The following was repeated before and after clerkship: Minnesota Multiphasic Personality Inventory (MMPI), Meyers-Briggs type indicator (MBTI), Patient-practitioner Orientation Scale (PPOS) and Authoritarian Personality (AP) scale. Results: In the 2006 study on patient-centeredness of medical students, the AP scores were significantly lower than before clerkship and the PPOS scores were significantly higher than before clerkship. AP score changes were related to MBTI, correlated with MMPI subscales, but inversely correlated with PPOS changes. In this study, the change in PPOS scores was not significant after clerkship in case of medical school graduates. AP score changes inversely correlated with PPOS changes, but neither correlated with MMPI subscales or MBTI. Conclusion: Considering previous findings, medical school graduates tend to be more patient-centered than medical students, but medical students can adopt a more patient-centered attitude than graduates through a psychiatric clinical clerkship.
通信의 傳送線路로 使用되는 Cable과 Coaxial Cable의 比較考察
洪奉植 大田工業高等專門學校 1970 論文集 Vol.6 No.-
In this paper we studied on the general analysis of characteristic constants-charateristic impedance, attenuation constant, phase constant and propagation velocity-of parallel transmission lines. And we derived the constants of cable and coaxial cable, based on the constants analyzed above. In order to coincide with swiftness, exactitude, stability and economical communication service, the conditions of transmission line were studied. Those are as follows: 1. The characteristic impedance should be constant, without the connection with the variation of frequency. 2. The attenuation constant must keep up the fixed value, whatever the frequency variable may be. 3. The phase constant should be in direct proportion to the variation of frequency. 4. The propagation velocity should keep up the constant value, having no relation with the frequency variable. In addition to these four conditions mentioned above, we conducted the influence of trouble making-cross talks of these two kinds of lines respectively. Finally, comparing the characteristic constants of these two transmission lines, -cable and coaxial cable- we found that the four conditions were more satisfied in the coaxial cable than in the cable.
Tungsten 中間層을 使用한 Permalloy薄膜에 關한 硏究
洪鳳植 충남대학교 공업기술개발연구소 1976 工業技術開發硏究所論文集 Vol.3 No.2
The magnetic properties of wire memory depends on the surface condition of the substrate (Cu). Particularly, the problem of surface condition of the electrodeposited magnetic film is more critical than that of the vacuum evaporated one. In this paper, to improve the magentic properties of wire memory, the tungsten film is electrodeposited between substrate and magnetic film. The permalloy magnetic film in which the tungsten film is electrodeposited, improves remakably the magnetic properties. So this type of permally magnetic film can be effectively used for the memory element.
NAND Gate만을 使用한 同期 論理回路의 設計에 關한 硏究
洪鳳植,吳承燁 충남대학교 공업기술개발연구소 1974 工業技術開發硏究所論文集 Vol.1 No.1
This paper deals with the design of Flip-Flop circuits with only NAND Gates. In particular, the design of the JK Flip-Flop is discussed by the solutions of the Logic equation and Transition Method. And these theories are applied for synchronous Logic circuits in experiments. Its stability is very good at required frequency ; 20kHz, and the results agree with the theory. It is expected to study the synchronous sequential logic circuits for NAND Gates increasing of this type.