전해가공을 이용한 Nitinol 형상기억합금의 그루브 패턴 가공특성에 관한 연구

신태희,김백겸,백승엽,이은상,Shin, Tae-Hee,Kim, Baek-Kyoum,Baek, Seung-Yub,Lee, Eun-Sang 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.2

A development of smart materials is becoming a prominent issue on present industries. A smart material, included in functions, is needed for micro fabrication. A shape memory alloy(SMA) in a smart material is best known material. Ni-Ti alloy, composed of nikel and titanium is one of the best shape memory alloy(SMA). Nitinol SMA is used for a lot of high tech industry such as aero space, medical device, micro actuator, sensor system. However, Ni-Ti SMA is difficult to process to make a shape and fabrications as traditional machining process. Because nitinol SMA, that is contained nikel content more than titanium content, has similar physical characteristics of titanium. In this paper, the characteristics of ECM grooving process for nitinol SMA are investigated by experiments. The experiments in this study are progressed for power, gap distance and machining time. The characteristics are found each part. Fine shape in work piece can be found on conditions; current 6A, duty factor 50%, gap distance 15%, gap distance $15{\mu}m$, machining time 10min.

휴대폰용 외관프레임의 전해 디버링 특성 평가

신태희,백승엽,이은상 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

For the graceful design and durability, cellular phone frame is been changing from the external to internal. Most of external frames are made by aluminium alloy, because that is required to be light and cheap while that should be hard. Due to the mass product using injection molding method or die casting method, these external frames have a lot of burrs. Moreover, microscopic burrs affect for parts badly, how that makes electric jamming. In addition, microscopic burrs could injure workers or users. In this paper, for the removal of microscopic burrs on the cellular phone external frame, electrochemical deburring is conducted and electrochemical conditions are researched.

S242 영역 성간 분자운의 전파 관측 연구

신태희,정재훈 한국천문학회 2005 天文學會報 Vol.30 No.2

IPA를 활용한 중학교 스포츠클럽강사 전문성 분석

신태희,조건상,김민성 한국체육대학교 체육과학연구소 2019 스포츠사이언스 Vol.37 No.1

The purpose of this study is to provide basic data for suggesting ways to improve the professionalism of middle school sports club coach. To this end, the professionalism of sports club coach perceived by students participating in middle school sports clubs was studied using Importance-Performance Analysis(IPA).The target group of this research was students who participated in three middle school sports clubs in Busan. Of the total 450 questionnaires, 406 were sampled, except for 44 cases that were deemed insincere or unreliable. All statistical significance levels of the collected data were set to ⍺=.05, and frequency analysis was performed using the SPSS 25.0 statistical program. Exploratory factor analysis (EFA) was also performed to verify the composition titration. The Cronbach's ⍺ value was calculated to test the reliability. Corresponding sample t-test was used to test the difference between importance and performance, and Importance-Performance Analysis was used. The first finding of this study is importance and satisfaction of the professionalism of middle school sports clubs coach. The top priorities of importance as per each questionnaire were 'respect for students,' and 'sincere attitude'. The top priorities of satisfaction were 'comfortable conversation' and 'sincere attitude'. The second finding shows the outcome of the test in the difference between importance and satisfaction of the professionalism of middle school sports club coach. A significant difference was found in the six categories of 'praise and encouragement','practical skill of the relevant event', 'knowledge of professional theory and terminology', 'Passionate guidance', and 'respect for students.'The third finding is the result of the Importance-Performance Analysis on the professionalism of middle school sports clubs coach. In the I quadrant there were five categories: 'respect for students', 'passionate guidance', 'sincere attitude', 'comfortable approach', and 'comfortable conversation'. In the Ⅱ quadrant (area of intensive improvement), there were two categories: 'praise and encouragement' and 'clear goal'. In the Ⅲ quadrant (area of inferiority ranking), there are four categories such as 'guidance until perfection', 'knowledge of professional theory and terminology', 'personal conversation for worries and career’ and ‘command of various movements.’ Lastly, the Ⅳ quadrant (area of avoid excess effort) was 'practical skill of the relevant event'.Based on the results of this study, the following plan is suggested for the purpose of improving the professionalism. 본 연구는 중학교 스포츠클럽강사의 전문성을 향상시킬 방안을 제시하기 위한 기초자료를 제공하는 데 그 목적이 있다. 이를 위해IPA를 활용하여 학교스포츠클럽 참여 학생들이 인식하는 중학교 스포츠클럽강사의 전문성을 연구하였다. 연구대상은 부산광역시소재 3개 중학교 스포츠클럽 참여 학생들을 대상으로 하였다. 총 450부의 설문지 중 불성실하거나 신뢰성이 없다고 판단되는 44부를제외한 406부를 유효 표본으로 설정하였다. 수집된 자료의 모든 통계적 유의수준은 ⍺=.05로 설정하였다. 그리고 SPSS 25.0 통계프로그램을 이용하여 빈도분석을 실시하였고, 구성타당도를 검증하기 위해 탐색적 요인분석을, 신뢰성을 검증하기 위해 Cronbach's ⍺계수를 산출하였다. 중요도와 만족도의 차이검정을 위해서 대응표본 t검정을 사용하였으며, IPA를 이용하였다. 연구결과로는 첫째, 중학교 스포츠클럽강사의 전문성에 대한 중요도와 만족도의 우선순위 결과이다. 중요도의 문항별 우선순위는 ‘학생에 대한 존중’, ‘열정적인 지도’, ‘성실한 태도’등의 순으로 나타났다. 만족도의 문항별 우선순위는 ‘학생에 대한 존중’, ‘편안한 대화’, ‘성실한 태도’등의 순으로 나타났다. 둘째, 중학교 스포츠클럽강사의 전문성에 대한 중요도와 만족도의 차이검정 결과이다. 셋째, 중학교 스포츠클럽강사의 전문성에 대한 IPA 결과이다. Ⅰ사분면(현상유지 영역)은 ‘학생에 대한 존중’의 5개 문항이 자리하였다. Ⅱ사분면(집중개선지향 영역)에는 ‘적절한 칭찬과 격려’, ‘명확한 목표’의 2개 문항이 자리하였다. Ⅲ사분면(열등순위 영역)에는 ‘완벽해질 때 까지 지도’의4개 문항이 자리하였다. Ⅳ사분면(과잉노력지양 영역)은 ‘해당종목의 실기기술’이 자리하였다.

[충청에서 연극하기] 중간지대의 연극인들

신태희 공연과이론을위한모임 2021 공연과 이론 Vol.- No.82

AZ31 경량화 마그네슘합금의 전해디버링 특성 평가

신태희(Tae-Hee Shin),차지완(Ji-Wan Cha),이은상(Eun-sang Lee) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-

The condition of materials that could be applied to the high-technology industry is required to a high-strength as well as a light weight. With the increasing demand for these conditions, magnesium alloy, one of the lightweight materials, is raising on the world. Magnesium alloy are not only being applied to the electronic equipment such as a frame of cellular phone and laptop computer, but also extending to the vehicle industry and the aero-space industry. This applications of the magnesium alloy are made of the die-casting process due to the production on a large scale. However, this process makes too many microscopic burr. So, for the removal of microscopic burrs on the magnesium alloy, electrochemical deburring process is suggested and its conditions are researched in this paper.

전해가공을 이용한 Nitinol 형상기억합금의 그루브 패턴 가공특성에 관한 연구

신태희(Tae-Hee Shin),김백겸(Baek-Kyoum Kim),백승엽(Seung-Yub Baek),이은상(Eun-Sang Lee) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.6

Nitinol 형상기억합금 전해가공의 전해액 영향분석

김백겸,신태희,백승엽,이은상 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

Electro-chemical Machining, the anodic dissolution process is able to achieve wanted a sharp shape and high quality surface without contact with workpiece and low heat effect using electrochemical reaction between anode and cathode. In hence this process useful to apply micro structure. A shape memory alloy for micro-structure and micro industrial technique, Nitinol is composed of approximately 55% Nikel and 45% Titanium by weight. This material is able to function as to transform specific shape from a certain deformation when the alloy is heated. Therefore Nitinol is used for several industries such as a medical industry, a aerospace, electrical application on a part of micro structure. In this paper, effect of electrolyte is studied on electrochemical machining for Nitinol shape memory alloy, copper is used for electrode, diameter and depth are measured as a extent of processing using optical microscope.

Investigation of Short Pulse Electrochemical Machining for Groove Process on Ni-Ti Shape Memory Alloy

이은상,신태희,김백겸,백승엽 한국정밀공학회 2010 International Journal of Precision Engineering and Vol.11 No.1

Ni-Ti, a shape memory alloy (SMA), can recover from deformation to its initial shape when heated. With using this effect, Ni-Ti SMA is applied for several industries such as a medical industry, an aerospace, electrical application on a part of micro structure. The Ni-Ti alloy used for SMA is composed of approximately 56% nickel and 44%titanium. With this composition, Ni-Ti alloy cannot be machined efficiently using traditional machining tools and methods such as the lathe, milling, and drilling because it shares the poor heat dispersion characteristics of titanium. Thus, Ti-Ni SMA should be machined using non-traditional machining methods. Electrochemical micro machining (EMM) is one form of non-traditional machining that can be applied to Ni-Ti SMA. As an anodic dissolution process, EMM allows the machining of complex shapes in Ti-Ni SMA without the generation of heat and without causing tool wear during the machining process. In this study, through the experiment that making the micro-groove, the characteristic of short pulse electrochemical machining (SPECM) process is accomplished to Ni-Ti SMA. And an evaluation of various machining factors for Ni-Ti SMA is also performed, through the substitution of different types of power source and machining time, and through simulation of the material removal rate (MRR). The experimental and simulation results are analyzed and compared.

Ni-Ti 형상기억합금의 전해가공을 이용한 미세 그루브 가공 특성연구

김백겸,신태희,백승엽,이은상 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

Electrochemical micro machining, the anodic dissolution process is considered to effective advantaged micro machining method which possess several advantages on electrically conducting and difficult to machine materials. Ni-Ti SMA(Shape Memory Alloy) is composed of approximately 56% Nikel and 44% Titanium by weight. This material is able to function as to transform specific shape from a certain deformation when the alloy is heated. However, Ni-Ti SMA is easily to loss characteristic that shape memory as a traditional machining process by reason of generating heat at contacting area between material and tool. Therefore Ni-Ti SMA is suitable electrochemical machining that needless contact a tool to material. In this paper, characteristics of micro groove process are studied on electrochemical machining to change tool diameter and distance between material and tool electrode.