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申澤均 大邱敎育大學校 科學敎育硏究所 1979 과학·수학교육연구 Vol.4 No.-
In this paper, it was intended for the children to develop their concepts of numbers in mathematics and to survey the features of their concepts of numbers. For this purpose, the objectives were the normal 69 kindergarden pupils and 494 pre-school children in Kyeongbuk area. And it was divided into 3 parts to find the concepts as follows: a) Calling the numbers in order b) Counting the materials c) Picking up the materials by number The basic abilities of the concepts were also surveyed for this purpose as follows: a) Equivalence in classifications b) Equivalence in numbers c) Conservation of numbers Here the results of this study were found by the method of proceeding parts of the concepts as follows: a) Children's abilities of calling and counting numbers were growing by their ages and developed by almost the same level. The abilities were able to be caught at the age of 4:3∼5, 5:6∼7,6:11∼20. b) Their abilities of picking up the materials by numbers were able to be caught at the ages of 4:3∼4,5:4∼5,6:8∼10and found to be undeveloped as compared with above two abilities. c) The city living children's concepts were a little more developed than those in the rural community and especially the abilities of calling and counting numbers differ city children from rural children by ther growing ages. d) Their concepts of semi-numbers were different in their circumstances but they were not strongly different. In kindergarten, they were developed quicker a year more than the other general children. e) Their equivalences in classification and number were almost same to both children and the age for this abilities seems to be at the age of 5. f) Their abilities of conservation of numbers were later than the other abilities. The age for this abilities are at the age of 6.
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신택현,천선기 서울産業大學校 2005 논문집 Vol.54 No.1
In the 21st century, the traffic culture is changing rapidly with the advent of high-speed train and it is called as the traffic revolution age. The policy management for inducing the creativity becomes important for research institutes since the research institutes play an important role in the lead and distribution of new technologies. Therefore, the approach strategy of this investigation is based on the viewpoint of the organizational culture for better performance of research and development through stimulating inducements of creativity and active action of members. A questionnaire survey was performed on five research institutes including a professional railway research institute (PRRI) and four industrial research institutes for the current research, and a development plan for organizational culture of a PRRI has been presented based on the comparison study between two different types of research institutes.
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n-CdS_(0.46)Se_(0.54)/p-Cu_92-x)S_(0.46)Se_(0.54) 이종접합 태양전지의 제작과 그 특성에 관한 연구
유상하,최승평,이상열,홍광준,서상석,김혜숙,전승룡,윤은희,문종대,신영진,정태수,신현길,김택성,유기수 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-
승화방법에 의해 CdS_0.46Se_0.54 단결정을 성장하여 결정구조를 조사하고, Van der Pauw 방법으로 Hall effect를 측정하여 carrier density의 온도 의존성과 mobility의 온도 의존성을 조사하였다. 성장된 CdS_0.46Se_0.54 단결정을 치환반응하여 n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 이종접합 태양전지를 제작하였다. Spectral response, 전류-전압특성 및 전력변환 효율을 조사하여 그 결과로부터 개방전압은 0.48V, 단락 전류 밀도는 21mA/㎠, fill factor와 전력변환효율은 각각 0.75와 9.5%를 얻었다. CdS_0.46Se_0.54 single crystal was grown by a sublimation method. The crystal structure and the temperature dependence of carrier density and mobility of CdS_0.46Se_0.54 single crystal were studied. Heterojunction solar cells on n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 were fabricated by the substitution reaction. The spectral response, the J-U characteristics and the conversion efficiency of the n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells were studied. The open-cricuit voltage, short-circuit density, fill factor and conversion efficiency of n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells under 80mW/㎠ illumination were found to be 0.48V, 21mA/㎠, 0.75 and 9.5%, respectively.
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Shin, Tack-Hyun The Korean Society for Railway 2012 International Journal of Railway Vol.5 No.1
The main purpose of this study is to highlight the importance and validity of introduction of stress-concerned aptitude items for the safety critical workers, corresponding to the radical environmental change in railway industry. To attain this purpose, the author performed a brief literature survey, and scrutinized the western practice in detail. Then, the necessity of introduction of stress-related aptitude items was suggested, based on the statistics resulted from a survey which has been once performed for experts and drivers. The final conclusion is that the present selection system through which the safety critical workers are being staffed, without any rigorous screening mechanisms cannot but have some limitations. So, an overall restructuring for aptitude management system needs to be done in order for us to advance to the position of upper-class railway country.
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Shin, Tack-Hyun,Choo, Jun-Sup The Korean Society for Railway 2011 International Journal of Railway Vol.4 No.3
The main purpose of this study is to highlight the effects of the Bolman and Deal's multi-frame leadership on the several dependent variables such as job satisfaction, respect from subordinates, effective goal attainment, promotion speed, and recognition as more a leader than a manager. To attain this purpose, 488 questionnaires verified to be free from flaws were processed through SPSS 14 Windows. The major finding was that versatile and adroit use of multiple frames can contribute to the effectiveness and success of the leader. That is, the multi-frame leadership had strong relationships with dependent variables such as trust and respects from subordinates, effective attainment of unit's goal, job satisfaction, recognition as more a real leader than as a manager, and promotion speed of boss. When we consider the ever-increasing environmental complexity surrounding every organization and the growing levels of needs of employees, the use of multi-frame leadership is not an 'ought' but a 'must' for all the people who aspire to become effective and successful leaders.
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Tack Hyun Shin 한국철도학회 2012 International Journal of Railway Vol.5 No.1
The main purpose of this study is to highlight the importance and validity of introduction of stress-concerned aptitude items for the safety critical workers, corresponding to the radical environmental change in railway industry. To attain this purpose, the author performed a brief literature survey, and scrutinized the western practice in detail. Then, the necessity of introduction of stress-related aptitude items was suggested, based on the statistics resulted from a survey which has been once performed for experts and drivers. The final conclusion is that the present selection system through which the safety critical workers are being staffed, without any rigorous screening mechanisms cannot but have some limitations. So, an overall restructuring for aptitude management system needs to be done in order for us to advance to the position of upper-class railway country.
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A Study On Leadership and Management Effectiveness Based on a Multi-Frame Model
Tack Hyun Shin,Jun Sup Choo 한국철도학회 2011 International Journal of Railway Vol.4 No.3
The main purpose of this study is to highlight the effects of the Bolman and Deal's multi-frame leadership on the several dependent variables such as job satisfaction, respect from subordinates, effective goal attainment, promotion speed, and recognition as more a leader than a manager. To attain this purpose, 488 questionnaires verified to be free from flaws were processed through SPSS 14 Windows. The major finding was that versatile and adroit use of multiple frames can contribute to the effectiveness and success of the leader. That is, the multi-frame leadership had strong relationships with dependent variables such as trust and respects from subordinates, effective attainment of unit's goal, job satisfaction, recognition as more a real leader than as a manager, and promotion speed of boss. When we consider the ever-increasing environmental complexity surrounding every organization and the growing levels of needs of employees, the use of multi-frame leadership is not an 'ought' but a 'must' for all the people who aspire to become effective and successful leaders.
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Shin, Dong-Hyun,Leem, Dong-Gyu,Shin, Ji-Sun,Kim, Joo-Il,Kim, Kyung-Tack,Choi, Sang Yoon,Lee, Myung-Hee,Choi, Jung-Hye,Lee, Kyung-Tae The Korean Society of Ginseng 2018 Journal of Ginseng Research Vol.42 No.2
Background: Extended endoplasmic reticulum (ER) stress may initiate apoptotic pathways in cancer cells, and ER stress has been reported to possibly increase tumor death in cancer therapy. We previously reported that caspase-8 played an important role in compound K-induced apoptosis via activation of caspase-3 directly or indirectly through Bid cleavage, cytochrome c release, and caspase-9 activation in HL-60 human leukemia cells. The mechanisms leading to apoptosis in A549 and SK-MES-1 human lung cancer cells and the role of ER stress have not yet been understood. Methods: The apoptotic effects of compound K were analyzed using flow cytometry, and the changes in protein levels were determined using Western blot analysis. The intracellular calcium levels were monitored by staining with Fura-2/AM and Fluo-3/AM. Results: Compound K-induced ER stress was confirmed through increased phosphorylation of $eIF2{\alpha}$ and protein levels of GRP78/BiP, XBP-1S, and $IRE1{\alpha}$ in human lung cancer cells. Moreover, compound-K led to the accumulation of intracellular calcium and an increase in m-calpain activities that were both significantly inhibited by pretreatment either with BAPTA-AM (an intracellular $Ca^{2+}$ chelator) or dantrolene (an RyR channel antagonist). These results were correlated with the outcome that compound K induced ER stress-related apoptosis through caspase-12, as z-ATAD-fmk (a specific inhibitor of caspase-12) partially ameliorated this effect. Interestingly, 4-PBA (ER stress inhibitor) dramatically improved the compound K-induced apoptosis. Conclusion: Cell survival and intracellular $Ca^{2+}$ homeostasis during ER stress in human lung cancer cells are important factors in the induction of the compound K-induced apoptotic pathway.
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Tack Hyun Shin,Jung Gon Kim,Zaynab Yusupova 대한안전경영과학회 2015 대한안전경영과학회 학술대회논문집 Vol.2015 No.11
This study highlights empirically the relationship among major constructs such as accident, fear and anxiety emotion, self-efficacy, and negative spillover of work, focused on the railway drivers. The differentiated factor of this study is in that the experience of accident was posed as exogenous variable. Hypothesis tests based on 201 samples verified that the experience of accidents showed a significant effect on negative spillover of work mediated by fear and anxiety, with moderating effect of self-efficacy between fear and anxiety and negative spillover of work. However, the moderating effect was shown as increasing the degree of negative spillover of work, since the drivers recognized their fear and anxiety accrued by accident experience as uncontrollable. This finding suggests the need for mitigating driver's negative emotion - fear and anxiety - through an introduction of practice such as exemption of settlement obligation in accident site and lowering of the penalty for accident responsibility.
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