발전설비 보일러 튜브 용접부의 잔여수명평가 신뢰성 향상을 위한 기계적 물성 변화 연구

오병진,장중순,Oh, Byungjin,Jang, Joong Soon 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.5

Boiler equipment in power plant is always being operated in harsh conditions and severely exposed to the extreme environment of high temperature. Therefore periodically the state of devices should be checked, diagnosed, and analyzed to ensure the reliability of the equipment. Traditionally, such a diagnosis is based one or two physical properties of the sample taken from the equipment like hardness, microstructure, etc.. However, to enhance the confidence of the diagnosis, it is necessary to synthesize those properties together. This paper is to propose such a synthetic procedure for T23 which was developed to be used in $569^{\circ}C/596^{\circ}C$ condition. Creep test and accelerated degradation test were performed simultaneously, and the physical properties such as microstructure, tensile strength, yield strength, hardness, and indentation properties were measured. This paper proposes a method of determining the remaining life by quantitative comparison. It will provide the basis of evaluating life assessment more objective and reliable.

유비쿼터스 환경에 적합한 모바일 교실 프레임워크 설계

오병진,엄남경,우성희,이상호,Oh, Byung-Jin,Eom, Nam-Kyoung,Woo, Sung-Hee,Lee, Sang-Ho 한국컴퓨터산업학회 2005 컴퓨터産業敎育學會論文誌 Vol.6 No.5

In the near future, we can access the information whenever we want, wherever we use because almost devices in ubiquitous environment are connected by either wired or wirelss networks. Especially, u-Learning which emphasizes on pedagogical property is enable to improve learning abilities. As researches of the previous u-Learning, there have been learning by mobile devices such as PDAs as well as the smart classroom which makes the remote students participate in the existing class. However, these researches have not satisfied pedagogical, cooperative and ubiquitous properties yet. Thus we suggest the framework for both local and mobile classroom, which can make the properties easy to satisfy. 향후 도래하는 유비쿼터스 환경에서는 모든 전자기기가 유/무선 통신망으로 연결되어 사용자는 언제 어디서나 원하는 정보에 접근할 수 있다. 특히, u-러닝(Ubiquitous-Learning)은 교육학적인 측면 뿐 아니라 어디서나 접근할 수 있다는 유비쿼터스적인 측면을 통해 학습의 효과를 보다 향상시킬 수 있다. 현재까지 추진된 u-러닝의 연구사례로, 주어진 학습 컨텐츠를 PDA를 이용하여 야외에서 학습할 수 있도록 하며, 원격지 모바일 환경의 학생들을 교실 수업에 참여시키는 스마트교실 등이 있다. 그러나 기존의 연구들에서는 학습자의 상호작용이나 협동학습 등의 교육학적인 속성과 유비쿼터스의 환경적 속성을 만족시키지 못함에 따라 본 연구에서는 어디서나 교실 환경에 참여하는 유비쿼터스 환경에 적합하면서도 교육학적인 면을 만족시키는 모바일 교실 프레임워크를 제안하고자 한다.

발전설비 보일러 튜브 용접부의 잔여수명평가 신뢰성 향상을 위한 기계적 물성 변화 연구(SA213-T12)

오병진,장중순,Oh, Byungjin,Jang, Joong Soon 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.3

Boiler equipment in power plant is always being operated in harsh conditions and severely exposed to the extreme environment of high temperature. Therefore periodically the state of devices should be checked, diagnosed, and analyzed to ensure the reliability of the equipment. Traditionally, such a diagnosis is based one or two physical properties of the sample taken from the equipment like hardness, microstructure, etc.. However, to enhance the confidence of the diagnosis, it is necessary to synthesize those properties together. This paper is to propose such a synthetic procedure for SA213-T12(1Cr-0.5Mo) which was developed to be used in $565^{\circ}C$ below condition. Creep test and accelerated degradation test were performed simultaneously, and the physical properties such as microstructure, tensile strength, yield strength, hardness, and indentation properties were measured. This paper proposes a method of determining the remaining life by quantitative comparison. It will provide the basis of evaluating life assessment more objective and reliable.

결정질 실리콘 태양전지의 Ag 촉매층을 이용한 나노 텍스쳐링 공정에 관한 연구

오병진,여인환,김민영,임동건,Oh, Byoung-Jin,Yeo, In-Hwan,Kim, Min-Young,Lim, Dong-Gun 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.1

In our report a relatively simple process for fast nano-texturing of p-type(100) CZ- silicon surface using silver catalyzed wet chemical etching in aqueous hydrofluoric acid (HF) and hydrogen peroxide solution($H_2O_2$) at room temperature. The wafers were saw-damaged by NaOH(6 wt%) at $60^{\circ}C$ for 150s. To obtain a nano-structured black surface, a thin layer of silver with thickness of 1 - 10 nm was deposited on the surfaces by evaporation system. After this process the samples were etched in HF : $H_2O_2$ : $H_2O$ = 1:5:10 at room temperature for 80s - 220s. Due to the local catalytic of the Ag clusters, this treatment results in the nano-scale texturing on the surface. This resulted in average reflectance values less than 9% after the silver on the surface of the wafers were removed.

급속 열처리 공정을 이용한 결정질 실리콘 태양전지의 전극 소결 최적화

오병진,여인환,임동건,Oh, Byoung-Jin,Yeo, In-Hwan,Lim, Dong-Gun 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.3

Limiting thermal exposure time using rapid thermal processing(RTP) has emerged as promising simplified process for manufacturing of solar cell in a continuous way. This paper reports the simplification of co-firing using RTP. Actual temperature profile for co-firing after screen printing is a key issue for high-quality metal-semiconductor contact. The plateau time during the firing process were varied at $450^{\circ}C$ for 10~16 sec. Glass frit in Ag paste etch anti-reflection layer with plateau time. Glass frit in Ag paste is important for the Ag/Si contact formation and performances of crystalline Si solar cell. We achieved 17.14% efficiency with optimum conditions.

CFD를 활용한 SCR(탈질설비) 문제점 분석 및 개선안 연구

오병진(Oh Byung Jin),장중순(Joong Soon Jang) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5-2

퍼베이시브 컴퓨팅 환경에서의 침입탐지용 모바일 에이전트에 대한 연구

오병진(Oh Byung-jin),엄남경(Um nam-kyoung),문형진(Mun hyung-jin),이상호(Lee sang-ho) 한국컴퓨터정보학회 2006 韓國컴퓨터情報學會論文誌 Vol.11 No.3

퍼베이시브 컴퓨팅 환경은 미국 표준화 기구인 NIST와 IBM이 함께 추진하고 있는 개념으로써 유비쿼터스와 유사한 의미이나, 개념적으로만 쓰이는 유비쿼터스와는 대조적으로 IBM에서 추진하는 하나의 사업적 상품명으로 취급되고 있다. 이러한 환경에 기초하여 침입탐지용 모바일 에이전트에 대한 연구가 함께 진행 중이다. 이 논문에서는 침입탐지를 위한 모바일 에이전트에 대한 연구를 다룬 후, 침입 탐지에 있어서 다중 모바일 에이전트를 기반으로 이동중의 모바일 에이전트를 이용한 침입 탐지 시나리오를 제안한다. 이를 통해 침입 탐지에 있어서 무결성 이동성의 과정에서 발생하는 침입 탐지 문제를 해결할 수 있었다. Pervasive computing environment is similar to the meaning of ubiquitous computing, however it is a kind of the commercial product, which is made from the collaboration between NIST and IBM. On the basis of this environment, the research of mobile agents for intrusion detection is going on in progress. In this paper, we study the research about mobile agents for the intrusion detection and then suggest scenarios using moving mobile agents based on the multiple mobile agents in the intrusion detection. Subsequently, we could figure out the problems which occurred through progress of integrity movement as a matter of the intrusion detection.

관광단지 개발 활성화를 위한 제도개선에 관한 연구

오병진(Oh Byoung-Jin),동정근(Dong, Jeong-Keun) 한국지역개발학회 2010 한국지역개발학회 학술대회 Vol.2010 No.11

Faced with Globalization, Many countries in the world are trying to develop industries to their economic and competitive power. One of these is the tourism, which is becoming more important than ever as an industry of the future. Tourism contributes to create a lot of employees, earn and invite foreign currency so that it can help it's local economy improve. Therefore, development of tourism complex is one of tourism industry that is expected to diversely develop, when national income elevates and the concept of leisure changes. This study was started to bring up the question on how to solve the problem about tourism complex in Korea, investigate the concept and feature of tourism complex, think over the precedent study on development direction and legal problems, and study the problem about the development of tourism complex with consideration of 29 tourism complex development and operation.

씨름선수의 키네시오 테이핑이 무산소성 운동능력과 피로물질에 미치는 효과

오병진(Byung-Jin Oh),노승덕(Seung-Deok Roh) 한국발육발달학회 2017 한국발육발달학회지 Vol.25 No.4

This study was conducted on 10 male ssireum players, who regularly exercise, to verify the effect of Kinesio taping on athletic performance and fatigue recovery. The analysis results for the change of anaerobic athletic capabilities (mean power, peak power, and fatigue index) and concentrations of muscle fatigues (lactic acid, ammonia, and inorganic phosphate) measured through Wingate Test depending on whether the Kinesio taping was used are as follows. SPSS 18.0 Window statistical program was used for this analysis. First, mean power, peak power and fatigue index, which are the anaerobic athletic capabilities, showed no differences between the groups, but were significantly decreased after 2 exercises according to the exercising times. There was no interaction between the exercising time and the group. Second, the concentration of lactic acid showed significantly lower in the taping group, and was high before and after one exercise, and before and after two exercises according to the time. There was no interaction between the time and the group, but significantly less lactic acid was verified to be created in the taping group. Third, the concentration of ammonia showed lower at the taping group than at the non-taping group, and was high before and after one exercise, and before and after two exercises according to the time. But there was no interaction between the time and the group. Fourth, inorganic phosphate concentration showed no difference between the groups, but was high before and after one exercise, and before and after two exercises. But there was no interaction between the time and the group. In conclusion, the Kinesio taping helped reduce muscle fatigues by improving blood supply to muscles, but have no effect on anaerobic athletic capabilities. Concentrations of lactic acid and ammonia, which are muscle fatigue substances, showed lower in the taping group than in the non-taping group, but muscle fatigues were not statistically significant in the test. In the future, continuous studies will be required to verify the effect of the Kinesio taping on the repeated anaerobic exercises or the exercises with sophisticated technical factors.

12주간의 탄성밴드 운동이 뇌병변 장애노인의 신체조성, 골밀도, 근력 및 유연성에 미치는 영향

오병진(Oh, Byung-Jin),황보배(Hwang, Bo-Bae),노승덕(Roh, Seung-Deok) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.5

With disabled elderly with brain lesion as subjects, changes in body composition, bone density, muscular strength, and flexibility after elastic band exercise of 12 weeks were analyzed as an effort to use elastic band as a method of stamina increase and rehabilitation for disabled elderly with brain lesion. 12 disabled elderly with brain lesion were performed of paired t-test on body composition, bone density, muscular strength, and flexibility before and after elastic band exercises. As a result, after elastic band exercise of 12 weeks, abnominal obesity significantly decreased(p<.05), whereas muscular strength increased in both left and right(p<.01). However, flexibility, bone density, body fat, etc. did not show significant difference. To be considered as an effective exercise program for improvement of body composition and bone density, a further study on exercise intensity should be performed.