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손정훈(Jung-Hun Son),양영수(Young-Soo Yang),이승영(Seung-Young Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A dental implant plays a role of real teeth but it suffer from both static load and dynamic load. It causes loosening of abutment screw and eventually it could lead a dental implant to fracture because of fatigue. In this paper, using three-dimensional finite element method we studied stress analysis and fatigue life prediction of the Branemark Type dental implant of using the dental service. Finite element analysis and fatigue test were concerned with ISO rules and tensile stress of screw was considered. Using this result, we estimated the fatigue life of the dental implant based on stress-life curve of Titanium. In order to ensure reliability of calculated fatigue life, fatigue test is performed. The calculated and experimental results showed good agreement
손정훈(Jung-Hun Son),이호영(Ho-Yeong Lee),배현지(Hyun-Ji Bae),김윤호(Yun-Ho Kim),이붕주(Boong-Joo Lee) 한국전자통신학회 2022 한국전자통신학회 논문지 Vol.17 No.5
본 논문은 음주운전 사고를 방지하기 위해 시동 전 음주 측정을 하는 음주운전 방지 시스템을 구현하였다. 자동차 내부에서 시동 전 음주 측정을 하여 측정 시 운전자가 아닌 타인이 대신 인증하는 상황을 방지하기 위해 지문 센서를 사용하여 본인인증 수단을 강화하였고, 이후 바람 센서의 설정값 이상 측정 확인 시 알코올센서가 작동하게 구현하였다. 센서들을 여러 실험을 통해 측정값을 정하였고 최종적으로 알코올 농도가 0.03%이상일 경우 DC 모터가 정지하여 차량 운행이 불가능하게 설계하여 음주운전이 사전에 차단되는 시스템을 구현하였다. In this paper, a drunk driving prevention system was implemented to measure drunk driving before starting to prevent drunk driving accidents caused by complacency after drinking. In order to prevent a situation in which a driver but not a driver authenticates instead of a driver, the identification means was strengthened and the alcohol sensor was implemented to operate when the wind sensor measured above the set value set. Through this system, the driver's alcohol measurement process was strengthened. Sensors were determined through various experiments, and finally, when the alcohol concentration was 0.03% or more, the DC motor was stopped and the vehicle was designed to be unable to operate, thereby implementing a system in which drunk driving was prevented in advance.
Formation pattern 연구를 통한 AGM 연축전지의 충전 효율 향상
김성준,손정훈,김봉구,정연길,Kim, Sung Joon,Son, Jeong Hun,Kim, Bong-Gu,Jung, Yeon Gil 한국결정성장학회 2021 韓國結晶成長學會誌 Vol.31 No.1
CO2 가스 발생 감소와 연비향상을 위해서 HEV 차량은 ISG 시스템을 채용하고 있다. 이 ISG 시스템은 배터리가 감당해야 하는 전기 부하를 증대시켰고, 시동 횟수도 급격히 늘어나게 하였다. 이를 위해 AGM 연축전지가 개발되어 사용되고 있으나, 종래의 연축전지에 비해서 formation 중 전해액량 조절이 더 높은 수준으로 유지해야 됨에 따라 충전시간이 약 3배 가량 길어지게 되었다. 본 연구에서는 formation pattern의 최적화를 통해서 충전효율을 증대시켜 충전시간을 단축하고자 하였다. formation pattern의 최적화를 위해서, 16개 multi step에 10개 충전 step과 6개의 방전 step을 적용하고, step별 충전 전류를 조절한 4가지 조건(21 hr, 24hr, 27 hr, 30 hr)으로 시험을 진행하였다. 그 결과 24 hr 시험 조건이 PbO2 변환율이 가장 높게 분석되었고, 용량 103.3 %, 저온시동성능 38 sec, 충전수입성 37.36 A로 나타났다. Multi-step과 방전 step을 적용한 충전 프로그램의 결과, 충전 중에 국부적으로 급격히 발생된 분극화를 제거하고 전류의 손실을 최소함으로써 충전효율을 증가시킬 수 있음을 검증하였다. 이렇게 충전효율을 증가시킴으로써 본 연구에서는 충전시간을 기존에 비해서 약 30 % 감소시키는 탁월한 결과를 얻을 수 있었다. In order to improve fuel economy and reduce CO2, HEV adopts ISG system as a standard. This ISG system increased the electric load that the battery had to bear, and the number of starting increased rapidly. AGM Lead Acid batteries have been developed and used, but the charging time is about three times longer as the electrolyte amount control during formation must be maintained at a higher level compared to conventional lead-acid batteries. In this study, we tried to shorten the charging time by increasing the charging efficiency through the optimization of the formation pattern. In order to optimize the Formation Pattern, 10 charging steps and 6 discharging steps were applied to 16 multi steps, and the charging current for each step was controlled, and the test was conducted under 4 conditions (21 hr, 24 hr, 27 hr, 30 hr). As a result of simultaneous application of multi-step and discharge step, it was verified that minimizing the current loss and eliminating the sudden polarization during charging contributes to the improvement of charging efficiency. As a result, it showed excellent results in reducing the charging time by about 30 % with improved charging efficiency compared to the previous one.
수열합성법에 의한 Ba(Mg<sub>1/3</sub>Ta<sub>2/3</sub>)O<sub>3</sub> 나노분말 합성
김락희,손정훈,배동식,Kim, Rak-Hee,Son, Jung-Hun,Bae, Dong-Sik 한국재료학회 2006 한국재료학회지 Vol.16 No.6
[ $Ba(Mg_{1/3}Ta_{2/3})O_3$ ] nanoparticles were synthesized in water solution under mild temperature and pressure conditions by precipitation from $Ba(NO_3),\;Mg(NO_3)_2{\cdot}6H_2O\;and\;TaCl_5$ with aqueous potassium hydroxide. The average size and distribution of the synthesized $Ba(Mg_{1/3}Ta_{2/3})O_3$ nanoparticles were below 100 nm and broad, respectively. The phase of synthesized particles was crystalline reacted at $170^{\circ}C$ for 4 h. The characterization of $Ba(Mg_{1/3}Ta_{2/3})O_3$ nanoparticles were studied using XRD, SEM, and TEM.
한인숙,손정훈,양영수,이승영,Han In-Sook,Son Jung-Hun,Yang Young-Soo,Lee Seung-Young 대한치과보철학회 2006 대한치과보철학회지 Vol.44 No.4
Purpose : The purpose of this study is to use finite element analysis to predict the fatigue life of an implant system subjected to fatigue load by mastication (chewing force). The reliability and the stability of implant system can be defined in terms of the fatigue strength. Not only an implant is expensive but also it is almost impossible to correct after it is inserted. From a bio-engineering standpoint, the fatigue strength of the dental implant system must be evaluated by simulation (FEA). Material and Methods Finite element analysis and fatigue test are performed to estimate the fatigue strength of the implant system. Mesh of implant is generated with the actual shape and size. In this paper, the fatigue strength of implant system is estimated. U-fit (T. Strong, Korea, internal type). The stress field in implant is calculated by elastic-plastic finite element analysis. The equivalent fatigue stress, considering the contact and preload stretching of a screw by torque for tightening an abutment, is obtained by means of Sine's method. To evaluate the reliability of the calculated fatigue strength, fatigue test is performed. Results: A comparison of the calculated fatigue strength with experimental data showed the validity and accuracy of the proposed method. The initiation points of the fatigue failure in the implant system exist in the region of high equivalent fatigue stress values. Conclusion: The above proposed method for fatigue life estimation tan be applied to other configurations of the differently designed and improved implant. In order to prove reliability of prototype implant, fatigue test should be executed. The proposed method is economical for the prediction of fatigue life because fatigue testing, which is time consuming and precision-dependent, is not required.
장중렬 ( Jang Jung-ryeol ),하재석 ( Ha Jae-seok ),손정훈 ( Son Jeong-hun ),박재진 ( Park Jae-jin ),김동주 ( Kim Dong-ju ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
이 논문에서는 초기 지중응력(initial ground stress)으로 인한 수직터널의 균열 발생여부를 확인하기 위해 수압파쇄시험을 실시하였다. 수압파쇄시험 결과 터널 내 발생된 균열은 초기 지중응력과의 직접적인 연관성이 낮음을 확인하였다.
장중렬 ( Jang Jung Ryeol ),하재석 ( Ha Jae Seok ),손정훈 ( Son Jeong Hun ),박재진 ( Park Jae Jin ),김동주 ( Kim Dong Ju ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
In this study various investigations were carried out to analyze the causes of leakage for 20 years on the slope of the downstream side of the dam during the ○○ dam precision safety diagnosis. Analysis showed that the possibility of underground water flowing through the valley section of the mountain area extremely low, and that direct leakage of the reservoir's freshwater was confirmed as the main leakage path.
용매열 공정을 이용한 세리아(CeO<sub>2</sub>) 나노분말의 합성 및 분산거동
임태섭,옥지영,최연빈,김봉구,손정훈,정연길,Lim, Tae Seop,Ock, Ji Young,Choi, Yeon Bin,Kim, Bong Gu,Son, Jeong Hun,Jung, Yeon Gil 한국재료학회 2020 한국재료학회지 Vol.30 No.7
CeO<sub>2</sub> nanoparticles, employed in a lot of fields due to their excellent oxidation and reduction properties, are synthesized through a solvothermal process, and a high specific surface area is shown by controlling, among various process parameters in the solvothermal process, the type of solvent. The synthesized CeO<sub>2</sub> nanoparticles are about 11~13 nm in the crystallite size and their specific surface area is about 65.38~84.65 ㎡/g, depending on the amount of ethanol contained in the solvent for the solvothermal process; all synthesized CeO<sub>2</sub> nanoparticles shows a fluorite structure. The dispersibility and microstructure of the synthesized CeO<sub>2</sub> nanoparticles are investigated according to the species of dispersant and the pH value of the solution; an improvement in dispersibility is shown with the addition of dispersants and control of the pH. Various dispersing properties appear according to the dispersant species and pH in the solution with the synthesized CeO<sub>2</sub> nanoparticles, indicating that improved dispersing properties in the synthesized CeO<sub>2</sub> nanoparticles can be secured by applying dispersant and pH control simultaneously.