최형섭과 ‘한국형 발전 모델’의 기원

임재윤(Jae Yoon Im),최형섭(Hyungsub Choi) 역사비평사 2017 역사비평 Vol.- No.118

This article critically reviews the “model” of Korean development designed by Choi Hyung Sup, Minister of Science and Technology of the Park Chung Hee government. The model has been an active template in Korea’s official development assistance (ODA) of science and technology. This acknowledgement comes from the belief that the model was effective in the development of Korea, and it attained widespread support from senior scientists and administrators of science in Korea. In this paper the authors highlight the fact that the model was from the beginning designed to be applicable in other countries. The argument is that the model was formulated within the context of Cold War development studies supported by international organizations. Through the process, Choi’s model acquired its characteristics of emphasizing legal and institutional set-ups, the role of national leaders and the national laboratories in introducing, digesting, and improving high technology.

鑄鐵에 있어서의 黑鉛球狀化 機構에 關한 硏究 (Ⅱ)

최형섭,박원구,Choi, Hyung-Sup,Park, Won-Koo 대한화학회 1964 대한화학회지 Vol.8 No.2

It was verified at Part Ⅰ of this investigation that there is a minimum wettability between molten iron and graphite, which was preliminarily coated with magnesium, and thus the spheroidization of graphite might have resulted from the lack of wettability between magnesium-adsorbed graphite and iron matrix. Being continued from the last work, the wettability between pure iron and graphite, coated with the various thickness of cerium, are measured at melting point of pure iron in vacuum and 200 mmHg argon gas atmosphere. The result indicates the presence of a minimum wettability at a critical thickness of cerium film as was proved in the case of magnesium. The experimental analysis shows that, the minimum wettability could be attributed entirely to a minimum work of adhesion between liquid iron and graphite at a critical concentration of cerium in the iron-graphite interface.

Mechanism of Collector Adsorption on Monazite

최형섭,황기엽,Hyung Sup Choi,Ki Up Whang Korean Chemical Society 1963 대한화학회지 Vol.7 No.2

The basic studies of adsorption characteristics of collector on monazite were made by electrophoretic measurement and by determination of the adsorption of some typical flotation collectors. By above measurements made on monazite, it is concluded that $H^+\;and\;OH^-$ are identified to act as potential determining ions and thus the electrical properties of monazite is controlled by the pH of the solution. Therefore, anionic collectors are adsorbed on positively charged surfaces and cationic collectors on negatively charged surfaces, which in turn controls the effective flotation condition with respective collectors for this mineral. These results have been correlated with its flotation behavior obtained by Hallimond tube test. 浮選理論의 基礎的인 硏究는 從來 主로 接觸角, 臨界 pH 曲線, 吸着量의 測定等에 依해서 試藥이 鑛粒子表面에 吸着하는 機構를 解明하였다. 그러나 最近 界面電氣化學的인 考察이 適用되어 試藥類의 吸着의 理論的인 究明이 試圖되고 있다. 鑛粒子는 電氣泳動現象에서 보는 바와 같이 水中에서 荷電되어 있고 한편 捕集劑는 ${\lceil}이온{\rfloor}$化 되어 있는 故로 當然히 그 吸着에는 電氣的인 相互作用이 있다고 想像할 수 있다. 따라서 電氣二重層理論이 鑛粒子의 荷電原因, 그 制御方法 및 吸着에 있어서 相互作用의 定量化에 基礎가 될 수 있는 것이다. 本硏究에 있어서는 Monazitc에 關하여 固相-液相界面에 있어서의 電氣化學的性質을 電氣泳動法으로 調査하고 한편 浮選捕集劑로 Dodecyl ammonium chlloride(D.A.C. 라 略稱) 및 Sodium dodecyl sulfate(S.D.S.라 略稱)를 使用하여 吸着量의 測定 및 浮遊度를 侍險한 結果 捕集劑 ${\lceil}이온{\rfloor}$이 鑛物表面에 吸着하는데 있어서 電氣的인 相互作用이 重要한 役割을 하고 있다는 것이 實證되였다. 卽 水溶液中에 있어서의 Monazite 表面의 電氣的 性質이 $H^+\;及\;OH^-$의 濃度(pH)에 따라 支配되는 것이고 電氣泳動法으로 測定한 Monazite의 等電點(Isoelectric point)은 pH 3.5이며 Monazite 表面은 pH 3.5以上에서는 陰(-)으로 pH 3.5以下에서는 陽(+)으로 荷電되어 있다는 것을 알 수 있다. 이와 같은 表面에 陰 ${\lceil}이온${\lceil}系의 S.D.S. 或은 陽 ${\lceil}이온{\rfloor}$系의 D.A.C.를 作用시키면 當然히 S.D.S.는 pH 低下에 따라서 卽 表面이 陰(+)이 되는데 따라 吸着量이 增加되고 한편 D.A.C. 때는 反對로 表面이 陰(-)이 되는데 따라 吸着量 이 增加된다고 볼 수 있으며 實地로 吸着量의 測定은 이것을 立證하고 있다. 이와 아울러 炭素鎖 12의 陽 ${\lceil}이온{\rfloor}$ 及 陰${\lceil}이온{\rfloor}$系 捕集劑 (卽 D.A.C. 및 S.D.S.)를 使用하여 Hallimond tube로 Monazite의 浮遊度를 測定한 結果를 보면 等電點을 中心으로 하여 左右로 거의 對稱的인 結果를 나타내고 있고 이것은 前述한 捕集劑의 吸着이 電氣的인 相互作用에 依한다는 事實을 뒷받침 하고 있는 것으로서 注目할 만한 現想이다. 이러한 基礎的인 究明은 重砂에서 Monazite를 될 수 있는대로 品位가 높은 精鑛으로 選別回收하는데 基本方針을 提示하는 것이다.

Electrokinetic Property and Flotation Characteristics of Scheelite

최형섭,한국남,Hyung Sup Choi,Kook Nam Han Korean Chemical Society 1963 대한화학회지 Vol.7 No.1

本硏究에서는 韓國産 灰重石($CaWO_4$)에 關하여 固相一液相界面에 있어서의 電氣化學的 性質을 電氣泳動法으로 調査하고 한便 浮遊性에 關하여서는 捕收劑로 Dodecyl ammonium chloride(D.A.C.라 略稱)와 Sodium dodecyl sulfate(S.D.S.라 略稱)를 使用하여 Hallimond tube 試驗, 接觸角測定 及 吸着量測定等의 捕收劑 이온이 鑛物表面에 吸着하는데 있어서 電氣的인 相互作用이 重要한 役割을 하고 있다는 것을 實證하였다. 卽 電氣泳動法으로 鑛粒의 水溶液中에 있어서의 mobility를 測定한 結果 灰重石의 境遇에는 $Ca^{++}$ 或은 $WO_4^{--}$이 界面 電氣特性을 決定하는 potental determining ion이라는 것이 確認되었고 水溶液中에 있는 $Ca^{++}$의 增加는 鑛粒界面의 陰電荷를 減少하며 $WO_4^{--}$의 增加는 그 陰電荷를 增加한다는 것을 알수 있다. 이와같은 表面에 "陰이온系"의 S.D.S. 或은 "陽이온系"의 D.A.C.를 作用시키면 當然히 S.D.S.는 $Ca^{++}$의 增加에 따라 吸着量이 增加되어 浮遊性이 增大되고 한便 D.A.C. 때는 反對로 $WO_4^{--}$이 增加하는데 따라 吸着量이 增加되며 따라서 浮遊性도 增大된다고 불수 있고 實地로 捕收劑吸着量의 測定 및 Hallimond tube 實驗은 이것을 立證하고 있다. 이러한 基礎的인 究明은 灰重石浮選理論의 根幹이 되는 것이고 從來의 浮選法 改良에 對한 指針이 될수 있다고 生覺한다. The fundamental investigations of surface properties of scheelite were made by electrophoretic mobility adsorption and contact angle measurements, and results have been correlated with its floatability obtained by Hallimond tube flotation test. The role of the interfacial electrical condition on the adsorption of collectors on mineral surfaces is discussed with the flotation of scheelite. From electrokinetic measurements made on scheelite, $Ca^{++}$ and $WO_4^{--}$ are identified to act as potential-determining ions, thus controlling the surface properties on this mineral. Therefore, at the fixed pH, the scheelite surface become to be less negatively charged with increasing $Ca^{++}$ concentration and more negatively charged with increasing $WO_4^{--}$ concentration in the pulp. Adsorption of collectors then depends strongly on the concentration of $Ca^{++}$ or $WO_4^{--}$ in the solution; anionic collectors are adsorbed on less negatively charged surfaces and cationic collectors on more negatively charged surfaces, which in turn defines the effective flotation range with respective collectors for this mineral.

鑄鐵에 있어서의 黑鉛球狀化機構에 關한 硏究 (1)

최형섭,장지영,Hyung Sup Choi,Ji Yung Chang 대한화학회 1963 대한화학회지 Vol.7 No.1

It is well known that the graphite flakes become spherulite, when a suitable amount of nodulizing element, such as cerium or magnesium, is added to the cast iron. The change of graphite from flake to nodular shape improves not only the tensile strength but the ductility as well. However, the mechanism of spheroidization of graphite in cast iron has not yet been clearly understood, and various theories proposed by a number of investigators were such that it may be due to the special nucleation effect, prevention of flake formation by the adsorption of magnesium vapour on the graphite surface or file surface free energy difference between plain graphite and magnesium-adsorbed graphite. Regardless of the speculations of spheroidizing mechanism of the graphite in the cast iron, the final phenomenon comes to the conclusion that it may be due to the lack of wettability between graphite and iron matrix. In order to collaborate this fact through an experimental method, the authors have constructed a vacuum arc furnace for the wettability measurement as its first step. Our study and experiments were then directed to the comparison of the wettability between iron and graphite on the two cases (namely, the one where magnesium was preliminarily coated on the graphite surface and the other not coated), by means of contact angle measurements. The result was such that a significant difference of the contact angles has been shown between the above two cases. indicating the spheroidization of graphite which might have resulted from the lack of wettability between magnesium-adsorbed graphite and iron matrix.

소프트웨어 화이트박스 테스트의 교호 강도 수 자동결정 방법 연구

최형섭(Hyeong-Seob Choi),박홍성(Hong-Seong Park) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

S/W 화이트박스 단위 테스트 시에 교호강도의 수를 결정해야 하는데 이를 소스에서 함수의 인자가 어떤 식으로 사용되는지를 분석하여 자동으로 결정할 수 있는 방법이 있다. 소스 상에서 인자 사용의 패턴을 분석하여 특정 패턴이 되면 강도수를 늘리고 최종적으로 교호 강도 수를 결정할 수 있게 된다. 본 논문에서는 이를 위해 조합 강도 결정 테이블을 작성하여 이를 이용한 테스트 교호 강도 수 결정 방법을 제시한다.

기술사와 기술비평 사이에서: 한국 기술사 연구의 흐름과 전망

최형섭 ( Choi Hyungsub ) 한국과학사학회 2020 한국과학사학회지 Vol.42 No.3

This essay aims to outline the history of history of technology in South Korea from the late 1970s to the present. The history of technology in South Korea began as side projects conducted by science and engineering professors. It was only in the 1990s that professionally-trained historians of technology appeared, producing work on the history of Western and Korean technologies. The second-generation historians of technology were influenced by constructivist theories of science and technology studies (STS). In order to construct a new narrative of technology for modern Korea eschewing a developmentalist approach, it will be necessary to make further links with those humanities and social science scholars who are interested in technologies, artifacts, and the built environment.

성과지표 특성이 평가의 수용성에 미치는 영향에 관한 연구

최형섭(Hyoung Sub Choi),서현식(Hyunsik SEO),오재인(Jay In Oh) 한국데이타베이스학회 2009 Journal of information technology applications & m Vol.16 No.2

The relationship between the performance measures and the acceptance of evaluation has been of importance not only in the academic field but in the business area. However, there had not been many studies on the factors which affect the goal core, that is, specificity and difficulty. The previous literature on the evaluation of measures has limitations in that the common and unique measures without suggesting the concept of shared measures are used. Thus, the purpose of this study is to examine the effects of the environmental characteristics of the goal setting on the result and acceptance of the evaluation, which is mediated by the characteristics of the goal core. This study further tests if there are any moderating effects from using the shared measures of performance.

소프트웨어 화이트박스 테스트의 교호 강도 수 기반 테스트 방법

최형섭(Hyeong Seob Choi),박홍성(Hong Seong Park) 大韓電子工學會 2009 電子工學會論文誌-CI (Computer and Information) Vol.46 No.5

소프트웨어가 복잡할수록 소프트웨어의 테스트에 들어가는 비용과 시간이 점점 증가되고 있는 문제점이 존재한다. 이러한 문제를 해결하기 위해서는 테스트에 사용되는 테스트 케이스의 수를 줄이는 것이 중요하다. 특히 단위 테스트 케이스 수를 결정하는 것에는 교호강도의 수가 중요한데 교호강도 수는 소스에서 인자간의 조합에 의해 함수의 결과에 영향을 미치는 인자들의 수를 말한다. 본 논문에서는 프로그램 코드 상에서 인자의 사용 패턴을 분석하여 특정 패턴이 되면 교호 강도 수를 늘리고 최종적으로 교호 강도수를 결정할 수 있는 방법을 제시한다. 제안하는 방법의 효과를 커버리지 및 결함 발견 수의 항목으로 실험을 통해 증명한다. Cost and Time for software test is gradually increasing as the software complexity increases. To cope with this problem, it is very important to reduce the number of test cases used in the software test. The interaction strength number is especially important in decision of the number of test cases for the unit test, where the interaction strength number means the number of arguments which affect the results of a function by the analysis of their combination used in source code of the function. This paper proposes the algorithm that computes the number of the interaction strength, where analyzes the patterns used in the source code of a function and increase its number when the pattern matches one of the specified patterns. The proposed algorithm is validated by some experiments finding coverage and the number of fault detection.

우슈도장 수련생의 서비스공정성 지각이 고객참여행동과 고객시민행동에 미치는 영향

최형섭(Choi, Hyung-Sub),한진욱(Han, Jin-Wook),김태형(Kim, Tai-Hyung) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.1

The purpose of this study was to examine the impact of service fairness on customer participation behaviors and customer citizenship behaviors in Wu-shu participants. Toward this end, a total of 270 wu-shu participants in Gyeonggi-do area was selected using a convenient sampling method. 250 usable questionnaires were returned to the researchers. Data analyses were conducted for frequency analysis, exploratory factor analysis, reliability test, correlation analysis, descriptive analysis, and multiple regression analyses with PASW 18.0. The results of this study indicated that (1) distributive and procedural fairness dimensions had significant effects on customer participant behaviors, (2) all the three sub-dimensions(distributive, procedural, and interactional) of service fairness had a significant impact on customer citizenship behavior, and (3) both communication and sympathy dimensions of customer citizenship behavior positively affected customer citizenship behavior. Additional implications and directions for future research were discussed.