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송상현 ( Sanghyun Song ),임현운 ( Hyunwoon Lim ),이경준 ( Kyeong-jun Lee ) 한국수산과학회 2023 한국수산과학회지 Vol.56 No.6
This study aimed to evaluate the effectivity of full-fat black soldier fly Hermetia illucens (BSF) and defatted meal-worm Tenebrio molitor (MW) larvae meal as a fish meal (FM) substitute in a low-fish meal (LFM) diet for juvenile olive flounder Paralichthys olivaceus. The LFM diet comprising 45% FM with tankage meal, poultry byproduct meal, soy protein concentrate and wheat gluten was the control diet. Three experimental diets were 10% FM in Con with BSF, MW and a mixture of both at the same ratio (designated as B10, M10 and B5M5, respectively). Four hundred and forty-fourth juvenile P. olivaceus (34.3±0.1 g) were randomly distributed into 12 tanks (425 L) in three replicate groups per treatment and fed the experimental diets for 15 weeks. At the end of the feeding trial, growth performance, survival, biological indices (condition factor, viscerosomatic index, hepatosomatic index), non-specific immune re-sponses (lysozyme, myeloperoxidase) and intestinal histology (villi length and goblet cells) were not significantly affected by treatments. Feed utilization was significantly decreased in M10 compared to the control group. Alanine aminotransferase level was significantly higher in M10 than in the control group. Glucose level was significantly lower in B10 than in the control group. These results suggest that BSF and MW can be used as FM substitutes. How-ever, considering feed conversion ratio and AST level, MW availability is thought to be lower than that of BSF, and feeding fish with a diet containing MW for an extended period is thought to adversely affect fish growth.
현주식(Joosik Hyun),문만빈(Manbeen Moon),오현운(Hyunwoon Oh) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
HS440, HS590 as an automotive steel sheet, which are used for a structural part in an auto-body, are occasionally exposed in the various temperature environments(about -50℃ ~ 150℃). Therefore, It is required to evaluate the mechanical characteristics(tensile strength, yield strength, elongation, work-hardening exponent etc.) under the low to high temperature environment. In this study, in order to identify the mechanical characteristics of HS440 and HS590, the uniaxial tensile tests are performed with the variation of temperature range from -60℃ to 200℃. Tensile tests carried out using universal testing machine(ZWICK Z250) with installed temperature chamber and acquired stress-strain relation, tensile strength, yield strength, elongation, work hardening exponent at the various temperature conditions. The test results showed that the mechanical properties(strength, elongation etc.) increased in the low temperature(0℃ ~ -60℃) and decreased in the high temperature(50℃ ~ 200℃). Accordingly, It is necessary to evaluate the accurate material properties and has to consider the change of mechanical properties with the variation of temperature for the safety design of an auto-body.