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.

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.

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℃.

조피볼락(Sebastes schlegeli)의 장거리 수송을 위한 적정 수온 및 염분 조건 탐색

양성진 ( Sung Jin Yang ),이정용 ( Jeong Young Lee ),전제천 ( Je-cheon Jun ),명정인 ( Jeong-in Myeong ),민병화 ( Byung Hwa Min ) 한국수산과학회(구 한국수산학회) 2017 한국수산과학회지 Vol.50 No.1

The optimum temperature and salinity for long-distance transportation of rockfish Sebastes schlegeli were investigated by assessing hematological characteristics and hemocyte mortality. The possible effects of the interaction of temperature and salinity on these attributes were also investigated. No significant difference was found in hematocrit and hemoglobin among experimental conditions. Glucose levels were highest in fish exposed to salinities of 34 psu (4℃), 18 psu (4-6℃) and 10 psu (4-8℃). Cortisol levels were elevated in the lowest temperature group (4℃), but upper limits decreased with decreasing salinity. AST and ALT increased as temperature decreased at salinities lower than 26 psu. The ratio of living cells was 99.0-99.6% in all experimental groups. The percentage of necrotic cells was highest in fish exposed to salinities of 34 psu (4℃), 18 psu (6-8℃), and 10 psu (4-8℃). The percentage of necrotic cells decreased significantly as temperature and salinity decreased, indicating that both salinity and the interaction of salinity and temperature affected cell necrosis.

외식 배달 앱 서비스의 지각된 위험이 지속적 이용의도에 미치는 영향

양성진(SUNG-JIN YANG) 한국외식경영학회 2022 외식경영연구 Vol.25 No.5

본 연구의 목적은 외식 배달 앱 서비스의 지각된 위험이 지속적 이용의도에 미치는 영향력과 주관적 규범의 매개역할을 살펴보는 것이다. 본 연구의 목적을 달성하기 위해 외식 배달 앱을 사용해 본 경험이 있는 서울지역의 성인을 대상으로 편의표본추출법에 의해 2022년 5월9일~5월24일까지 설문조사를 실시하였으며, 총266부를 최종 자료로 실증분석에 사용하였다. 분석결과, 첫째, 외식 배달 앱 서비스의 심리적 위험이 지속적 이용의도에 부(-)의 영향을 미치며, 프라이버시 위험은 지속적 이용의도에 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 주관적 규범은 외식 배달 앱 서비스의 프라이버시 위험과 지속적 이용의도 간에 매개열할을 하는 것으로 나타났다. 본 연구결과를 통해 소비자들의 배달 앱에 대한 지각된 위험을 감소시킴으로써 배달 앱 서비스를 지속적으로 이용할 수 있도록 외식 배달 앱 기업들에게 유용한 자료를 제공할 수 있을 것이다. The purpose of this study is to examine the effect of perceived risk of food delivery app service on continuous use intention and the mediating role of subjective norms. A survey was conducted from May 9 to May 24, 2022 by the convenience sampling method targeting adults in Seoul who had experience using food service delivery apps, and a total of 266 copies were used as final data for empirical analysis. As a results, first, the psychological risk of the food delivery app service had a negative(-) effect on the continuous use intention, and the privacy risk had a positive(+) effect on the continuous use intention. Second, the subjective norms play a mediating role between the privacy risk of the food delivery app service and the continuous use intention. Through the results of this study, it will be possible to provide useful data to food delivery app service companies so that they can continue to use delivery app services by reducing consumers' perceived risk of delivery apps.

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.

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)

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.

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

온라인 쇼핑몰의 HMR 선택속성이 만족과 재구매의도에 미치는 영향

양성진(Sung-Jin Yang),조용범(Yong-Bum Cho) 한국조리학회 2015 한국조리학회지 Vol.21 No.6