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이상연,육조영,이성국 한국스포츠리서치 2001 한국 스포츠 리서치 Vol.12 No.4
The purpose of this study was to investigate the relationship between teacher's leadership and task environment recognized by learners and the effect of leadership of sub-group in the class upon organizational behavior. It meant to examine the instructional activity and learning activity from the standpoint of leadership theory. The subjects 139 pupils. 1. Teacher's leadership of task orentation decreased uncertainty of expectancy which conditioned task environment. 2. Teacher's leadership of human orientation and task orientation enhanced valence of learning activity and outcome. 3. Significant positive correlation between sub-group's leadership human orientation and learning effectiveness in favorable task environment for learners were found(p<0.1). 4. Significant positive correlation between sub-group sleadership of human orientation (p<.01) and task orientation (p<.05) and recognition of pleasure in sport were found in favorable task environment
최경범,육조영,김진국 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.6
The purpose of this study was to examine the model of tactical approach in games teaching bt analyzing the models of games education in the United States. As a result of this study, the following were clarified: 1) Although the traditional approach to games teaching focused on teaching skills, it didn't bring about any development on student's game performance. For this reason, tactical approach has come to attract a great deal of attention. 2) The model of tactical approach in games teaching guides students to learning both tactical awareness and skill execution which are necessary in a game setting. As a result, it makes it possible for students to develop their game performance. 3) The effectiveness of tactical approach leaves some indistinct points. To put it to practical use, it is necessary for us to add modifications to it's research design and test it continously.
A Study on the Superconducting Synchronous Generator With the Fixed-Type Field Coil
Young Jin Hwang,Sukjin Choi,Jae Young Jang,Jiho Lee,Yong Soo Yoon,Ho Min Kim,Yoon Do Chung,Young-Sik Jo,Mi Hye Jang,Al-Ammar, E. A.,Tae Kuk Ko IEEE 2013 IEEE transactions on applied superconductivity Vol.23 No.3
<P>This paper presents a superconducting synchronous generator with a fixed-type field coil. The feasibility of the proposed design was verified by finite element method analysis. Unlike conventional superconducting synchronous generators, the proposed superconducting synchronous generator has two rotor cores with homopolar and circular superconducting field coils. This structure has advantages in the design and fabrication of excitation and cooling systems for superconducting field coils. In addition, the circular superconducting field coils are easier to manufacture with high tension as compared to the racetrack field coils or similarly shaped field coils for the conventional superconducting synchronous generators. This paper provides useful data for the design and fabrication of a superconducting synchronous generator.</P>
A Study on the Characteristic Evaluation of An HTS Coil with respect to the Winding Methods
Jo, Hyun-Chul,Choi, Suk-Jin,Jang, Jae-Young,Hwang, Young-Jin,Lee, Chang-Young,Ahn, Min-Cheol,Yoon, Yong-Soo,Ko, Tae-Kuk The Korean Society of Superconductivity and Cryoge 2010 한국초전도저온공학회논문지 Vol.12 No.4
In superconducting magnet applications, winding methods of the superconducting magnet can be classified into a layer winding and a pancake winding. The superconducting magnet using high temperature superconductor (HTS) with rectangular shape is generally fabricated using the pancake winding method. On the other hand, low temperature superconducting (LTS) magnet may be wound by either a pancake winding or a layer winding. Compared with the layer winding, the pancake winding method has a merit of easy replacement of a damaged pancake module, but it also has a demerit of requirement of splicing between each double pancake modules. In this paper, we investigated characteristics of the layer and pancake winding methods using HTS. Six samples were wound out of BSCCO and Coated Conductors (CCs) by two winding methods and their characteristics were experimentally observed.
Young Gun Park,Young Jin Hwang,Jae Young Jang,Hyung Jun Kim,Woo Seung Lee,Hyun Chul Jo,Ho Min Kim,Yong Soo Yoon,Tae Kuk Ko Institute of Electrical and Electronics Engineers 2014 IEEE transactions on applied superconductivity Vol.24 No.3
<P>Transporting large currents through High- Tc (HTS) current leads (CLs) inevitably involves using several HTS tapes in multi-stacked form to obtain a high current density. For safe operation of HTS CLs, the thermal stability of stacked HTS tapes should be considered. In this paper, we investigated electrical and thermal properties of multi-stacked HTS tapes using 2G coated conductor (CC). Three kinds of commercial CC with different specification of stabilizer were used for the experiment. Each stack sample was fabricated by soldering together CC tapes using In-Bi alloy. To verify the effects of a stabilizer on thermal stability for multi-stacked CC tapes, we performed an experiment of minimum quench energy measurements. In addition, transient electrical and thermal behavior were measured as a function of the external heat input energy. Each stack sample has a heater made of nickel-chromium (Ni-Cr) wire to make the external heat disturbance and a type-E thermocouple to measure the temperature. Based on the test results, electrical and thermal characteristics of multi-stacked CC tapes were evaluated.</P>
A Study on the Shape of Iron-Core for a Hybrid Electro-Magnetic Suspension System
Young Jin Hwang,Jae Young Jang,Sukjin Choi,Jin Bae Na,Hyun Chul Jo,Chang Young Lee,Tae Kuk Ko Institute of Electrical and Electronics Engineers 2012 IEEE transactions on applied superconductivity Vol.22 No.3
<P>This paper deals with the shape design of the iron-core of a hybrid EMS (electro-magnetic suspension) system. A proto-type hybrid EMS system was developed by Yonsei University in 2010 [1], [2]. It is the first step of study on fundamental technology for advanced railroad systems development. The hybrid EMS system requires cooling systems because it uses superconducting magnets [3], [4]. These cooling systems can influence costs to making and operating the hybrid EMS system. Therefore, a study to reduce the number of cooling systems needs to be carried out in order to economically commercialize the hybrid EMS system. In this paper, a method that reduces the number of cooling systems of the hybrid EMS system was proposed. To achieve this, a small-scale iron-core and coils assembly was fabricated. Using this system, characteristics of levitation force according to the structure of the iron-core was evaluated. Also, numerical analysis using the FEM tool in order to evaluate the levitation force and net force of a full-scale model was performed. This paper can be expected to suggest useful data for the design of a hybrid EMS system.</P>
Cytocompatibility of silkworm cocoon layer extracts
Jo, You-Young,Kim, Sung-Kuk,Lee, Kwang-Gill,Bae, Sung Min,Kim, Jong-Ho,Shin, Bong-Seob,Jeon, Jong-Young,Kweon, HaeYong Korean Society of Sericultural Science 2016 International Journal of Industrial Entomology Vol.33 No.2
Recently silk polymer produced by Bombyx mori silkworm has been considered as biological macromolecules. Silk polymer was extracted in PBS solution at $37^{\circ}C$ for 72 h or $72^{\circ}C$ for 24 h. The effect of EtOH treatment on the cocoon extraction was also examined. The extraction yield of cocoon was less than 1 wt% regardless of extraction conditions. UV spectroscopy showed that the experimental extracts have absorption bands at 280 nm. There is no cytotoxicity effect on the mouse fibroblast L929 cell. The phenotype of L929 cell was not changed under the experimental conditions. The proliferation behavior of L929 cell was not affected by the addition of cocoon extract. Therefore, cocoon extract might be cytocompatible and can be used as promising biomaterials.
관동맥 질환 환자에서 Lipoprotein ( a ) 농도와 당내인성과 관련성
두영철(Young Cheoul Doo),최조영(Jo Young Choi),장명국(Myung Kuk Jang),홍성훈(Sung Hun Hong),장명준(Myeong Jun Chang),고순희(Soon Hee Koh),한규록(Kyoo Rok Han),오동진(Dong Jin Oh),유규형(Kyu Hyung Ryu),고영박(Young Bahk Koh),이영(You 대한내과학회 1996 대한내과학회지 Vol.51 No.4
N/A Objectives: A raised Lp (a) lipoprotein concentration is associated with coronary artery disease and impaired glucose intolerance has also been shown to be predictive of coronary artery clisease in some studies. It has been suggested that there is a significant association between impaired glucose tolerance and increased circulating Lp (a) lipoprotein concentration. The object of this study is to determine whether glucose intolerance and raised Lp (a) concentration are associated in subjects with coronary artery disease. Methods: The study group comprised 60 patients with coronary artery disease (M:20, mean age 56+/-13 year) and 70 control subjects without coronary artery disease (M:15, mean age 58+/-10 year). We compared the clinical variables, lipid profile including Lp (a), fasting glucose, and fasting insulin in subjects with coronary artery disease with impaired glucose tolerance and normal glucose tolerance, and in controls. Results: 1) Nine of 60 patients (15%) with coronary artery disease had glucose intolerance. There were no significant difference in the incidence of cardiovascular risk factors, body mass index, left ventricular mass index, the levels of lipid including Lp (a), and the levels of fasting glucose, insulin, and C-peptide except in the incidence of smoking (48% in patients with coronary artery disease vs 24% in normal control, p<0.05) between patients with coronary artery disease and normal controls. 2) Between coronary artery disease patients group with and without glucose intolerance, and normal controls, there were no difference in the level of Lp (a) concentration. Conclusion: The level of fasting glucose and concentration of Lp (a) were no difference in between patients with coronary artery disease and normal controls. There was no difference in concentration of Lp (a) in patients of coronary artery disease with and without glucose intolerance, and so suggest that raised Lp (a) lipoprotein concentration are not responsible for the association between impaired glucose tolerance and coronary artery disease.
Cytocompatibility of silkworm cocoon layer extracts
( You-young Jo ),( Sung-kuk Kim ),( Kwang-gill Lee ),( Sung Min Bae ),( Jong-ho Kim ),( Bong-seob Shin ),( Jong-young Jeon ),( Haeyong Kweon ) 한국잠사학회 2016 International Journal of Industrial Entomology Vol.33 No.2
Recently silk polymer produced by Bombyx mori silkworm has been considered as biological macromolecules. Silk polymer was extracted in PBS solution at 37℃ for 72 h or 72℃ for 24 h. The effect of EtOH treatment on the cocoon extraction was also examined. The extraction yield of cocoon was less than 1 wt% regardless of extraction conditions. UV spectroscopy showed that the experimental extracts have absorption bands at 280 nm. There is no cytotoxicity effect on the mouse fibroblast L929 cell. The phenotype of L929 cell was not changed under the experimental conditions. The proliferation behavior of L929 cell was not affected by the addition of cocoon extract. Therefore, cocoon extract might be cytocompatible and can be used as promising biomaterials.