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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℃.
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.
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.
적정 수송 조건하의 활어용 컨테이너 내 참전복(Haliotis discus hannai)의 생존 및 생리 변화 구명
양성진 ( Sung Jin Yang ),전제천 ( Je-cheon Jun ),강희웅 ( Hee Woong Kang ),박노백 ( Noh Back Park ),민병화 ( Byung Hwa Min ) 한국수산과학회(구 한국수산학회) 2018 한국수산과학회지 Vol.51 No.3
This study investigated survival rates and physiological responses in Pacific abalone (Haliotis discus hannai) to 18 days of containment in live fish containers (8℃, 34 psu). The investigation was divided into three periods: before, during, and recovery after transportation. The overall survival rate was greater than 99%. Glucose, aspartate aminotransferase (AST) and alanine aminotransferase (ALT) rose immediately on the first day of containment, but then gradually returned to normal levels. NH<sub>3</sub> continued to rise after the first day, but during the recovery period it decreased to a level not significantly different from that of the control group. Na<sup>+</sup> and osmolality did not show any abnormal changes. After recovery, superoxide dismutase (SOD) was not significantly different from control. Abalone in the experimental group had lower glutathione reductase (GR) than control. The hyalinocyte ratio fell immediately after confinement, but then gradually increased until it reached a normal level. The ratios of apoptotic and necrotic cells indicated no specific variations in hemocyte viability. Histological changes in the epidermal layer and muscle layer of the foot were not significantly different from those seen in the control group. The experimental data obtained in this study suggest that live fish containers may be used for transport of Pacific abalone withouts ignificantly impacting their physiology or survival rates.
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.
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)