변형률-수명 평가기법을 이용한 Al/CFRP 하이브리드 적층 복합재의 피로수명 측정

양성진,권오헌,전상구,Yang, Seong Jin,Kwon, Oh Heon,Jeon, Sang Koo 한국안전학회 2021 한국안전학회지 Vol.36 No.3

Hybrid laminated Al/carbon-fiber-reinforced plastic (CFRP) composites are attracting considerable attention from industries such as aerospace and automobiles owing to their excellent specific strength and specific rigidity. However, when this material is used to fabricate high-pressure fuel storage containers subjected to repeated fatigue loads, fatigue life evaluation for the working load is regulated as an important criterion for operational safety and ease of maintenance. Among the existing evaluation methods for these vessels, the burst test and the hydraulic repeat test require expensive facilities. Thus, the present study aims to develop an improved fatigue life test for Al/CFRP laminated hybrid composites. The test specimen was manufactured using a curved mold considering the shape of a type III high-pressure storage container. The strain-life method was used for fatigue life evaluation, and the life was predicted based on the transition life. The results indicate that the more complex the CFRP stacking sequence, the longer is the transition life. This test method is expected to be useful for ensuring the fatigue safety and economy of hybrid laminate composites.

참전복(Haliotis discus hannai)의 장거리 수송을 위한 적정 수온 및 염분 조건 탐색

양성진,민병화,이정용,전제천,명정인,Yang, Sung Jin,Min, Byung Hwa,Lee, Jeong Young,Jun, Je-Cheon,Myeong, Jeong-In 한국해양생명과학회 2017 한국해양생명과학회지 Vol.2 No.2

This study was carried out to investigate the stress response of pacific abalone exposed to various water temperatures (4, 6, 8, and 10℃) and salinities (26, 30, and 34 psu) for 7 days, with the aim of finding optimum conditions for long-distance ocean transport of pacific abalone. At the end of the experiments, the survival rate was ranged from 98.7~100% at 8 and 10℃ but dropped to 25~55% at 4℃ in all salinity levels. The levels of SOD and glutathione in hemolymph were significantly higher at 4 and 6℃ than the control in all salinity groups, indicating that these temperatures induce severe stress in pacific abalone. It was found that THC was lowest at 6℃ in the 26 psu groups. The study showed that the hemocyte of pacific abalone populations mostly consisted of blast-like cells and hyalinocytes with the ratio of hyalinocytes being significantly lower at 4 and 6℃ than the other temperatures in the 26 psu groups. Percentages of apoptotic cells and necrotic cells were higher in the 26 psu group and 4 and 6℃ temperature groups. These results explicit that pacific abalone was exposed to greater stress at 26 psu and at 4 and 6℃ but experienced no significant higher stress at 30 and 34 psu and 8 and 10℃. It was therefore concluded that the optimum temperature and salinity for the long distance transport of pacific abalone range from 8~10℃ and 30~34 psu, respectively.

수온과 염분이 참전복, Haliotis discuss hannai의 혈림프액 성상과 유리아미노산 조성에 미치는 영향

양성진,이정용,황형규,민병화,신윤경,명정인,Yang, Sung Jin,Lee, Jeong Young,Hwang, Hyung Kyu,Min, Byung Hwa,Shin, Yun Kyung,Myeong, Jeong In 한국해양생명과학회 2016 한국해양생명과학회지 Vol.1 No.1

Glucose was continuously increased as time was elapsed under the temperature at 6℃ and 4℃. NH₃ was significantly increased at 4℃. AST was increased as temperature and salinity were decreased which indicated that it was affected by temperature, salinity and interaction of temperature×salinity. ALT was significantly increased as temperature was decreased. Free amino acid contents, excluding aspartic acid, threonine, serine and glycine were increased as temperature was decreased. This decreasing tendency was also observed when salinity was decreased. Taurine, aspartic acid, glutamic acid and arginine were significantly increased as salinity was decreased, while glycine, alanine, methionine, tyrosine, and histidine were decreased as salinity was decreased. The result of this study suggested that transport condition to minimize the stress is considered in the range of 30~34 psu, 8~10℃.

독성지수 시험규격 BS 6853 Annex B 와 BSS 7239 간 독성지수 산출법 비교 및 상관식 도출

양성진(Sung Jin Yang),이창덕(C. D. Lee),오지은(J. E. Oh),강찬용(C. Y. Kang) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10

국내외 법령과 규격에 따르면, 철도차량에 사용되는 내장재를 대상으로 재질의 난연 성능을 진단하기 위해 화염전파, 연기밀도 그리고 독성지수 항목을 주로 시험한다. 관계된 국내 법령인 ‘(도시)철도차량 안전기준에 관한 지침’에 의거하면 BS 6853 Annex B 시험방법을 통한 독성지수 성능을 진단하게 되는데, 해외공급품의 경우 BSS 7239 시험 방법에 의거한 독성지수 결과를 제시하는 경우가 많다. 따라서 본 논문에서는 재질의 독성지수를 측정하는 두 규격(BS 6853 Annex B, BSS 7239)간 시험결과를 직접 비교할 수 있도록 산출법을 분석하여 상관식을 도출하고자 한다. In accordance with domestic regulations and overseas standards, combustible materials which intended to be used for railway vehicle should be tested against parameters mainly as Flammability, Smoke density and toxicity to prove the required reaction to fire performance. Based upon the domestic regulation, The Rolling Stock (Commute Urban Subway) Safety Guideline by MOLIT (Minister of Land, Infrastructure and Transport), it is required to test and prove the Toxicity performance in accordance with the BS 6853 Annex B while overseas supplied items are occasionally are tested under the BSS 7239 standard, not a BS 6853 Annex B. With this background, Correlation has been investigated through comparing calculation method between two kinds of toxicity test standards.

FDS(Fire Dynamics Simulator)를 이용한 전동차 화재감지 시뮬레이션

양성진(Sung Jin Yang),이창덕(Chang Deok Lee),노주현(Joo-Hyun Rho),박길배(Kilbae Park),이강운(Kang Wun Lee),김창용(Chang Yong Kim),박원희(Won Hee Park),이원용(Won-yong Lee) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10

철도차량 기술기준에 의거 화재위험이 있다고 판단되는 차량의 구획공간에는 화재감지기가 설치되어야 한다. 이에 따라서 철도차량의 객실 천정 부에는 열·연기 복합 화재감지기가 설치되며 이는 지정된 연기 농도(15%/m)와 온도(65℃)조건에서 화재 상황임을 인지하여 감지신호를 송출한다. 이때 해당 구획공간 내 감지기 수량과 배치 등의 설계변수가 화재감지 응답속도에 영향을 주는 인자로 작용한다. 본 연구에서는 FDS(Fire Dynamics Simulator) 해석 툴을 이용하여 화재성장을 모사하고 설정된 감지기 수량과 배치 조건에서 감지 응답속도를 예측하고자 하며 이를 통해 해당 설계 타당성과 전동차 화재감지성능을 검토하였다. Fire detector shall be equipped within a confined area which may lead to risk of fire in accordance with the Technical Specifications for Urban Railway Vehicles (KTRS-VE-Part51). As per this technical guidelines, heat and smoke detector are considered generally to the vehicle design to perceive the fire occurring at the condition of pre-determined temperature (65℃) and smoke concentration (15%/m). In considering fire detection design, parameters such as amount of detectors and its arrangement deemed to be main factors could affect on detecting promptness. The aim of this study is to review the parameter adequacy for fire detection design by simulating the fire growth and detection time for the typical urban railway vehicle by using of FDS (Fire Dynamics Simulator)

요즘 애들을 위한 기독교교육의 방향: MZ세대를 중심으로

양성진(Sung-Jin Yang) 감리교신학대학교 2022 신학과세계 Vol.- No.103

본 논문은 MZ세대를 중심으로 요즘 애들을 위한 기독교교육의 방향에 관한 고찰이다. 최근 요즘 애들은 정치적, 경제적, 사회문화적 영역에서 큰 영향력을 끼치고 있다. 이에 요즘 애들에 대한 이해가 필요하다. 연구자는 개별성을 추구하는 세대, 다층적 소통을 강조하는 세대, ‘왜?’라고 질문하는 세대로 요즘 애들의 특성을 규정짓는다. 또한 요즘 애들을 위한 신앙교육의 방향으로 개방성, 환대, 경계의 속성을 가진 하나님의 품을 제안할 것이다. 더욱이 하나님의 품이 되는 신앙공동체는 개별성을 추구하는 세대를 위한 개별맞춤형 신앙교육, 다층적 소통을 강조하는 세대를 위한 공감과 소통의 신앙교육, ‘왜?’라고 질문하는 세대를 위한 목적 지향적 신앙교육을 제언할 것이다. This article explores the direction of Christian education for young people these days, focusing on the MZ generation. Recently, young people have been exerting great influence in the fields of politics, economy, and social culture. Therefore, it is necessary to understand young people today. I define the characteristics of young people these days as a generation that pursues individuality, a generation that emphasizes multi-layered communication, and a generation that asks why. Moreover, I will propose the arms of God with the attributes of openness, hospitality, and boundary in the direction of faith education for young people these days. Also, the faith community as the arms of God aims to provide individual customized faith education for the generation seeking individuality, faith education for compassion and communication for the generation emphasizing multi-layered communication, and purpose-oriented faith education for the generation asking why.

철도 차량 화재시 화재강도 예측을 위한 연구

양성진(Yang Sung-Jin),장정훈(Chang Jung-Hoon),강찬용(Gang Chan-Yong) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

Most of train fires which occur in usual cases do not grow up significantly on a large scale enough to bring about casualties and harmful damages. However, the consequence of some train fire accidents can be devastating disaster so that it would be even recorded in history in unusual cases. Accordingly, such a probability of fire disaster cannot be ignored in aspect of the railway safety assesment. A scale of injury and damage is very difficult to predict and analyze. Because it is depend on various factors, i.e. fire load, burning period, facilities, environment condition, and so on. Thus, a prediction of fire load could be understood as a one methodology to estimate railway safety assesment. The summation method which is one of them is used to evaluate the overall fire load by assuming that sum of heat release rate per unit area or mass of each composite material equals the total. However, since the train fire is classified into a compartment fire in under-ventilation condition. The summation method do not estimate a fire load completely. In this journal, Various methods to predict fire load are introduced and evaluated. Especially the fire simulation tool FDS(Fire Dynamics Simulator)which is based on the CFD(Computational Fluid Dynamics) is introduced, too. Through the FDS simulation, numerical analyses for the fire load and flame spread are performed. Then, these results of the simulation are validated through the comparison study with the experimental data. Then, limitations and approximations including in simulation process are discussed. The future direction of research is proposed.

Kriging 활용한 AFPM 모터 냉각 유로 최적설계 연구

양성진(S. Yang),조용우(Y. Cho),우혜림(H. Woo),신용우(Y. Shin),서정무(J. Seo) 한국전산유체공학회 2023 한국전산유체공학회 학술대회논문집 Vol.2023 No.5

동합금 가두리 망 사육어류, 조피볼락(Sebastes schlegeli)의혈액 성상과 중금속 축적률

양성진 ( Sung Jin Yang ),전제천 ( Je Cheon Jun ),박정준 ( Jung Jun Park ),명정인 ( Jeong In Myeong ),신윤경 ( Yun Kyung Shin ) 한국어류학회 2014 韓國魚類學會誌 Vol.26 No.3

동합금 가두리망에 6개월간 사육한 조피볼락을 대상으로동합금 가두리 망에서 유출되는 물질이 어류의 생존, 성장및 건강도에 미치는 영향을 조사하였다. 대조구와 실험구간의 생존율과 성장률 그리고 혈액 성상은 유의한 차이가 없었으며(P/0.05), 간세포의 형태 및 간 조직 내에 존재하는 모세혈관과 담관의 구조가 특이적인 차이를 보이지 않았다. 구리와 아연 축적량은 실험 초기에 비해 증가하였지만 실험구와 대조구 간의 차이가 없었으며 허용기준치에 비해 매우 낮게 나타나 본 연구에 사용된 동합금망은 어류의 생존, 성장 및 건강도에 영향을 끼치지 않는 것으로 여겨진다. The effect of substances discharged from copper alloy mesh on the survival rate, growth, and health status of Sebastes schlegeli was investigated. Survival rate of experimental group was 10%higher than control group. There was no significant difference in weight gain and SGR between control group and experiment group (P/0.05). Glucose concentration was lower in the experimental group than that in the control group. GOT and GPT contents did not show significant difference during experiment except for the early three months of experiment (P/0.05). Ammonia concentration had not significantly changed in the experimental group, but it had increased until four months of experiment and then decreased afterwards in the control group. TCHO had decreased in the experiment group compared with that of control group. Copper and zinc contents had increased as compared with those in the initialst age of experiment with no significant difference between experiment group and control group(P/0.05). Histological analysis for the liver revealed that liver tissues were not particularly different from those in control group. There were no significant differences in survival rate, growth, and hematological characteristic between control group and experiment group (P/0.05). Though copper and zinc were accumulated as compared with those during the initial stage of experiment, the levels were lower than permissible levels for copper and zinc. As a result, copper alloy mesh would not adversely affect on the survival rate, growth, and health status of fishes.

고급 한식당 서비스 실패의 심각성이 고객행동의도에 미치는 영향: 서비스 회복의 진정성의 조절효과를 중심으로

양성진(Sung-Jin Yang),조용범(Yong-Bum Cho) 한국조리학회 2019 한국조리학회지 Vol.25 No.6