Hollow Abutment Screw Design for Easy Retrieval in Case of Screw Fracture in Dental Implant System

Sim, Bo Kyun,Kim, Bongju,Kim, Min Jeong,Jeong, Guk Hyun,Ju, Kyung Won,Shin, Yoo Jin,Kim, Man Yong,Lee, Jong-Ho Hindawi 2017 Journal of healthcare engineering Vol.2017 No.-

<P>The prosthetic component of dental implant is attached on the abutment which is connected to the fixture with an abutment screw. The abutment screw fracture is not frequent; however, the retrieval of the fractured screw is not easy, and it poses complications. A retrieval kit was developed which utilizes screw removal drills to make a hole on the fractured screw that provides an engaging drill to unscrew it. To minimize this process, the abutment screw is modified with a prefabricated access hole for easy retrieval. This study aimed to introduce this modified design of the abutment screw, the concept of easy retrieval, and to compare the mechanical strengths of the conventional and hollow abutment screws by finite element analysis (FEA) and mechanical test. In the FEA results, both types of abutment screws showed similar stress distribution in the single artificial tooth system. A maximum load difference of about 2% occurred in the vertical load by a mechanical test. This study showed that the hollow abutment screw may be an alternative to the conventional abutment screws because this is designed for easy retrieval and that both abutment screws showed no significant difference in the mechanical tests and in the FEA.</P>

A one-step method for covalent bond immobilization of biomolecules on silica operated in aqueous solution

Sim, Yong-Kyun,Jung, Heetae,Kim, Su Hyun,Park, Jung-Woo,Park, Woo-Jin,Jun, Chul-Ho Royal Society of Chemistry 2018 Chemical Science Vol.9 No.41

<▼1><P>One-step covalent bond immobilization of biomolecules on silica in water is promoted by weak organic acid using bifunctional linker.</P></▼1><▼2><P>A simple, one-step method for covalent bond immobilization of biomolecules on silica operated in water is described. In the approach, an NHS-ester linked methallylsilane is utilized as a bifunctional linker to couple the biomolecule to the silica surface. Weak organic acid such as acetic acid activates the silica surface enough to react with bifunctional linker without destroying activity of biomolecule.</P></▼2>

고등학교 태권도선수의 완벽주의 성향과 스포츠자신감 및 운동몰입의 인과관계

심영균(Sim, Young-Kyun),김지태(Kim, Ji-Tae),이석준(Lee, Seok-Jun) 한국웰니스학회 2017 한국웰니스학회지 Vol.12 No.2

이 연구의 목적은 고등학교 태권도선수의 완벽주의 성향과 스포츠자신감 및 운동몰입 의 인과관계를 구조방정식 모형을 통해 실증적으로 규명하는데 있다. 아울러 매개변인을 통해 완벽주의 성향이 운동몰입에 미치는 직·간접적 영향력을 알아봄으로써 고등학교 태권도선수의 경기력 향상을 위한 기초자료를 제공하는데 있다. 이와 같은 연구의 목적을 달성하기 위해 서울, 경기지역의 고등학교 태권도 선수 341명을 대상으로 구조화된 설문지를 사용하여 자료를 수집 하였다. 수집한 자료의 처리는 SPSS 21.0과 Amos 21.0 프로그램을 사용하여 가설을 검증하였고, 유의수준은 α=.05로 설정하였다. 이상의 과정을 통해 도출한 결론은 다음과 같다. 고등학교 태권도선수의 완벽주의 성향, 스포츠자신감, 운동몰입의 인과관계를 규명한 결과, 완벽주의 성향은 스포츠자신감에 정(+)적으로 유의한 영향을 미치는 것으로 나타났으나, 운동몰입에 유의한 영향을 미치지 않는 것으로 나타났다. 또한 스포츠자신감은 운동몰입에 정(+)적으로 유의한 영향을 미침과 동시에 완벽주의 성향과 운동몰입의 관계에서 완전매개의 역할을 하는 것으로 나타났다. The purpose of this study was to demonstrate the relationship among the three variables by using structural equation modeling. This study also provided preliminary data to improve the performance of high school Taekwondo players by analyzing the mediating variables that account for the direct and indirect effects of perfectionism to exercise commitment. Three hundred and forty-one participants who were high schools Taekwondo players in Seoul and Gyeonggi were used for this study. The collected samples were tested using SPSS 21.0 and Amos 21.0 with the significance level of α=.05 The results obtained from the above procedure are as follows: After analyzing the causal relationship among the perfectionism, sports confidence and exercise commitment of high school players, it was found that perfectionism became positive reinforcement for sports confidence but not for exercise commitment. As a result, sports confidence became positive reinforcement for exercise commitment and served as a full mediation variable between perfectionism and exercise commitment.

실시간 급전응동시험의 시장감시 효과 및 시장영향 분석등에 관한 사례연구

심균택(Sim Kyun-Taek),서경무(Suh Kyung-Moo),강지훈(Kang Ji-Hoon),조춘택(Cho chun-Taeck) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

2001년 4월 우리나라에 도매전력시장이 개설된 이후 처음으로 시행된 중앙급전발전기에 대한 실시간 급전응동시험(일명 “불시급전지시”)에 대한 사례를 소개하고, 이러한 시험이 전력시장과 시장감시 측면에서 가지는 의미를 논하고 시험실시에 따른 시장비효율 규모를 추정하며 사업자의 허위입찰 행위가 전력시장가격 및 정산금 변동에 미치는 영향을 분석하였다.

청소년 태권도 선수의 번아웃 척도(TABS) 개발 및 타당화 검증

심영균(Sim, Young-Kyun),김지태(Kim, Ji-Tae),이석준(Lee, Suk-Jun) 세계태권도문화학회 2020 세계태권도문화학회지 Vol.11 No.1

The purpose of this study was to develop and validate of Taekwondo Athletes Burnout Scale for youth (TABS). Total participants were 1,160 student athletes and 17 coaches and the study went through 3 steps (developing items, internal validity, external validity). In the first step, data were collected by open questionnaire and conceptualized by using content analysis and categorization. In the second step, EFA and CFA were conducted to verify internal validity. The correlation analysis and paired t-test were used to verify external validity in the last step. As a result, The TABS categorized into four factors: physical exhaustion, psychological/emotional exhaustion, environmental conflict, and reduced sense of accomplishment and motivation in the first step, however, after EFA and CFA, the TABS consisted of psychological and physical exhaustion 9 items, conflict with teammate 4 items, conflict with coach 4 items, and reduced sense of accomplishment 6 items. Finally, As a result of correlation and paired t-test, the TABS secured external validity. In conclusion, the TABS developed with 4 factors 23 items and identified as a tool to measure the burnout of Taekwondo student-athletes.

청소년 태권도선수의 승부근성(Tenacity) 척도에 대한 타당도 증거: Rasch 모형의 적용

심영균 ( Sim Young-kyun ),서은철 ( Seo Eun-chul ) 국기원 2022 국기원태권도연구 Vol.13 No.2

목적 Rasch 모형을 적용하여 청소년 태권도선수의 승부근성(Tenacity) 척도에 대한 타당도 증거를 제시하는데 목적이 있다. 방법 청소년 태권도선수 423명(남자 290명, 여자 133명)의 유효표본을 jamovi 2.0 프로그램을 활용하여 빈도분석, 확인적 요인분석을 실시하였고, jMetrik 4.1.1 프로그램을 활용하여 Rasch 모형(응답범주의 적절성, 문항 적합도 및 난이도, Item-Person Map 분석)분석을 실시하였다. 결과 첫째, 승부근성 척도는 기존이 2요인 구조보다는 3요인 구조를 선택하는 것이 적절하다. 둘째, 승부근성 척도의 응답반응은 기존 Likert 5점 형태보다는 Likert 4점 형태로 수정하는 것이 적절하다. 셋째, 승부근성 척도의 문항 난이도를 살펴본 결과 Q4, Q5, Q7, Q9, Q10, Q15, Q16번 문항은 적합하지 않는 것으로 나타났다. 넷째, Item―Person Map 분석을 통해 청소년 태권도선수의 승부근성 척도는 난이도가 높은 문항이 추가할 필요가 있는 것으로 나타났다. 결론 집단의 성격에 맞는 승부근성 속성을 보다 잘 반영하여, 후속 연구를 위한 모델링을 도출할 필요가 있는 것으로 나타났으며, 후속연구에서는 이 연구에서 도출한 3요인 10문항 척도를 적용하는 것이 권장된다. Purpose The purpose of this study was to present validity evidence for the tenacity scale of adolescent taekwondo athletes applying the rasch model. Method Frequency and confirmatory factor analysis were performed on valid sample of 423(Male: 290, Female: 133) adolescent Taekwondo athletes using the jamovi 2.0 program and the Rasch model analysis using the jMetrik 4.1.1 program. Results First, it was appropriate to select a 3 factor structure rather than the existing 2 factor structure for the competitive strength scale. Second, it was appropriate to modify the response response of the competitive strength scale to a 4 point Likert format rather than the existing 5 point Likert. Third, the difficulty of the items on the tenacity scale questions Q4, Q5, Q7, Q9, Q10, Q15, and Q16 were found to be inappropriate. Fourth, item person map analysis, it was necessary to add items with high difficulty level to the adolescent taekwondo athletes tenacity scale. Conclusion It was found the necessary to get a result of modeling for the following study by better reflecting the competitiveness attribute suitable for the groups personality, and recommend to apply the 3 factor 10 item scale

중 · 고등학교 태권도선수의 선수스트레스와 반사회적 스포츠행동 및 사회적 비행행동의 관계

심영균(Sim, Young-Kyun) 한국웰니스학회 2020 한국웰니스학회지 Vol.15 No.1

이 연구는 중 고등학교 태권도선수의 선수스트레스와 반사회적 스포츠행동 및 사회적 비행행동의 관계를 규명하는데 목적이 있다. 이를 위해 이 연구에서는 서울, 경기, 강원 지역 중 고등학교 태권도선수를 모집단으로 선정하여 260표본을 추출하였으며, 이 중 응답의 일관성이 결여되는 6명의 자료를 제외한 총 254명의 자료를 최종분석에 사용하였다. 수집된 자료처리는 가설을 검증하기 위해 SPSS 23.0 통계프로그램을 활용하여 빈도분석, 탐색적 요인분석, 신뢰도분석, 상관관계분석, 다중회귀분석을 실시하였으며, 다음과 같은 결과를 얻었다. 첫째, 선수스트레스의 하위요인인 지도자 스트레스는 반사회적 스포츠행동의 모든 하위요인에 영향을 미치는 것으로 나타났다. 둘째, 선수스트레스의 하위요인인 지도자 스트레스와 동료스트레스는 사회적 비행행동에 영향을 미치는 것으로 나타났다. 셋째, 반사회적 스포츠행동의 하위요인인 비신사적 행동과 비언어적 행동은 사회적 비행행동에 영향을 미치는 것으로 나타났다. 결론적으로 중 · 고등학교 태권도선수의 스트레스는 반사회적 스포츠행동과 사회적 비행행동을 증가시키는 것으로 나타났다. 이 연구 결과를 통해 중 · 고등학교 태권도 선수들의 일탈행동을 사전에 예방하기 위하여 선수 스트레스 관리의 중요성에 대한 기초자료를 제공하는데 의의가 있다. The purpose of this study was to investigate the relationship among athlete stress, antisocial sport behavior and social misconduct behavior of Taekwondo athletes in middle and high school. In order to achieve this, a sample of 260 drawn out of the Taekwondo players from Seoul, Gyeonggi, and Gangwon was selected as a population. Data acquired from 6 people were excluded due to inconsistency in their responses. Therefore, the data of 254 people was used for a final analysis. The acquired data was analyzed through the correlation and multiple regression analyses from the statistical software, SPSS 23.0. The results obtained from this process were as follows. First, leader stress, a subfactor of athlete stress, was found to affect all subfactors of antisocial sport behavior. Second, leader stress and peer stress, which are sub-factors of athlete stress, were found to offect social misconduct behavior. Third, unsportsmanlike and nonverbal behaviors, which are sub-factors of antisocial sports behaviors, were found to affect social misconduct behaviors. In conclusion, the stress of Taekwondo athletes in middle and high school was found to increase antisocial sports behavior and social misconduct behavior. The results of this study were meaningful to provide basic data on the importance of athlete stress management in order to prevent deviant behavior of middle and high school Taekwondo athletes.

대학 태권도선수의 은퇴불안과 번아웃 및 심리적 안녕감의 관계

심영균(Sim, Young-Kyun),김지태(Kim, Ji-Tae),김현륜(Kim, Hyun-Ryun) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.4

The purpose of this study was to investigate the relationship among retirement anxiety, burnout, and psychological well-being of university Taekwondo players. In this study, 300 university Taekwondo players who participated in a Taekwondo national athlete tournament dispatch at summer Universiade competition were selected as a population. A total of 294 data were used for the final analysis except for the 6 data lacking consistency of responses. The collected data were analyzed by frequency analysis, confirmatory factor analysis, regularity verification, correlation analysis, and structural equation modeling using SPSS 23.0 and Amos 23.0 programs. The results of this study were as follows. First, retirement anxiety of university Taekwondo players had a positive effect on burnout. Second, retirement anxiety of university Taekwondo players has negative effect on psychological well-being. Third, burnout of university Taekwondo players did not significantly affect psychological well-being. The results of this study could be used as basic data for the improvement of the treatment of college taekwondo athletes and the plan of retirement anxiety.

고등학교 태권도선수의 실수인식과 자기관리 및 인지된 경기력에 관계

심영균(Sim, Young-Kyun),이석준(Lee, Suk-Joon),정우민(Jeong, Woo-Min) 세계태권도문화학회 2019 세계태권도문화학회지 Vol.10 No.2

The purpose of this study was to investigate the relationship among high school Taekwondo player s perception of errors, self-management and perceived performance. For this purpose, the participant of this study were surveyed using 301 high school Taekwondo player. The survey tool used the questionnaires revised and supplement in the previous research, and researchers visited and collexted the data. The collected data were analyzed by frequency analysis, correlation analysis, confirmatory factor analysis, and structural equation modeling using SPSS 23.0 and Amos 23.0 programs. The results of this study were as follows. First, the perception of errors in high school Taekwondo players had a positive effect on self-management Second, the self-management of high school Taekwondo players had a statistically significant effect on perceived performance. Third, the perception of high school Taekwondo players errors did not affect perceived performance. Fourth, the perception of errors of high school Taekwondo players influenced perceived performance by mediating self-management.

중소형 증기터빈의 기동특성 및 제어로직 고찰

육심균(Sim-Kyun Yock),서중석(Jung-Surk Sur),조창호(Chang-Ho Cho),최준혁(June-Hyug Choi),우주희(Joo-Hee Woo) 대한전기학회 1999 대한전기학회 학술대회 논문집 Vol.1999 No.7