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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℃. NH<sub>3</sub> 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℃.
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.
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.
한국학의 필요성과 동서철학의 방법론적 차이 -유럽철학과 유가철학을 중심으로-
양성진 ( Sun Jin Yang ) 한국동서철학회 2016 동서철학연구 Vol.0 No.80
한국은 물질적 요소와 정신적 요소의 불균형이 극에 달하게 되었다. 우리의 관심이물적 토대인 자본주의적 사고에 집중되면서 그 이외의 정신적 가치 내지 규범은 거의 부재하게 되었다. 한국의 철학계가 관심을 기울여야하는 것은 서양철학도 그리고 동양철학도 아니다. 한국적 문제 상황을 가장 잘 치유할 수 있는 철학이 무엇인지를 고민해야하는 시점에 왔다. 한국 사회는 서구적 요소와 동양적 요소가 모두 혼재한 상태이다. 한국인과 한국 사회에 침투된 서구적 요소와 유전적으로 지니고 있는 동양적 사고를 동시에 고려한 진정한 의미의 < 한국학 >이 요청된다. 소크라테스로부터 시작된 서양의 이성중심의 철학과 공자로부터 시작된 중국 유학의 감성중심의 철학이 동서철학의 차이점이라고 할 수 있다. 그리고 서양은 하나의 개념을 통해 사태를 설명하려는 경향이 강하다면, 동양은 언어로 모든 것을 설명할 수 없다는 철학적 경향이 강하다. 또한 서양은 형이상학이 중심이 되어 철학적 사고를 함양시키는 것을 중요시한다면 동양은 철학적 사고보다는 삶의 실천의 문제에 집중하였다고 할 수 있다. In a capitalist society, South Korea is an imbalance of physical and mental component elements. our attention focused on the material basis. There are few rules to spiritual values. We should worry about what can the best heal the Korean problem situations. South Korea society is mixed with both the oriental and Western elements. We have to truly reseach the Korean studies. Firstly, we have to understand the difference between an accident and Eastern and Western thought, because it is a indispensable for understanding the Koreans. The philosophical differences between East and West. are between occidental philosophy centered reason since Socrates and oriental philosophy centered emotion of Chinese confucian philosophy. The Western thought has a strong tendency to explain the state through a single concept, while the Orient philosophy has strong philosophical tendencies that can not explain everything in the language. Western philosophy is focused on the metaphysics, while Eastern philosophy is centered on the ethics.
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.