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양식산 넙치와 자연산 넙치의 관능적 특성 및 저장중 신선도 변화 연구
박병학,박소희,조재선 한국조리과학회 2003 한국식품조리과학회지 Vol.19 No.1
This study was conducted to investigate the physicochemical and organoleptic characteristics and freshness of wild and cultivated Paralichthys olivaceus during storage. By the results of morphological observation, wild Paralichthys olivaceus had white abdomen, light black skin and transparent muscle, but cultivated Paralichthys olivaceus had black spotted abdomen, dark black skin and dark pink muscle. Moisture contents of wild and cultivated Paralichthys olivaceus were similar, but the lipid content was higher in cultivated Paralichthys olivaceus than that of wild Paralichthys olivaceus. Sensory scores of appearance, Taste, texture and overall acceptability were higher in wild paralichthys olivaceus than that of cultivated Paralichthys olivaceus. The reason was that lipid content was higher in cultivated Paralichthys olivaceus. The freshness of cultivated paralichthys olivaceus seemed to last shorter than that of wild one due to rapid increase of the volatile basic nitrogen content, pH and total microbial count during storage.
신제품개발을 위한 프론트로딩 요소 우선순위 도출 :자동차부품 설계단계 중심으로
박병학,옥영석,천동필,박세훈 한국산업경영시스템학회 2019 한국산업경영시스템학회지 Vol.42 No.4
The purpose of this study is to provide the priority of the front-loading factors in the design stage of the automotive parts development process in order to efficiently and effectively respond to the demands of the car maker (customer). Front-loading is defined as a strategy in order to improve development performance by shifting the identification and solving of design problems to earlier phases of a product development process. Two approaches of the front-loading are project-to-project knowledge transfer and rapid problem solving. For the study, a survey was conducted on the R&D department in the automobile parts company and analyzed by AHP (Analytic Hierarchy Process) method. The result of the survey shows the cost savings is the highest weight in terms of front-loading effect and in terms of front-loading factors, it gives priorities as “the problems of past project” first, “Design Review” second, “CAE (Computer Aided Engineering)” third, “FMEA (Failure Mode and Effects Analysis)” fourth, “benchmarking” and SR (Sourcing of Requirements). The results of the study will be helpful to provide practical value for improving product design of component development.
박병학 여수대학교 1997 論文集 Vol.11 No.2
Applicability of the RNG κ-εmodel to the analysis of unsteady axisymmetric turbulent flow of a reciprocating engine including intake system is studied numerically. The predicted results using the RNG κ-εmodel are compared to these from the modified κ-εmodel and experimental data. Using the RNG κ-εmodel, the predicted axial and radial velocity at the valve exit and in-cylinder region show good agreements with the experimental data. The application of the RNG κ-εmodel seems to have some potential for the simulations of the unsteady turbulent flow within a port/valve-cylinder assembly over the modified κ-εmodel.
개방형 지열시스템의 효율적 설계를 위한 영향인자에 대한 연구
박병학,전원탁,이보현,이강근,Park, Byeong-Hak,Joun, Won-Tak,Lee, Bo-Hyun,Lee, Kang-Kun 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.4
Open-loop groundwater heat pump (GWHP) system generally has benefits such as a higher coefficient of performance (COP), lower initial cost, and flexible system size. The hydrogeological conditions in Korea have the potential to facilitate the use of the GWHP system because a large number of monitoring wells show stable groundwater temperatures, shallow water levels, and high well yields. However, few studies have been performed in Korea regarding the GWHP system and the most studies among them dealt with Standing Column Well (SCW). Because the properties of the aquifer have an influence on designing open-loop systems, it is necessary to perform studies on various hydrogeological settings. In this study, the hydrogeological and thermal properties were estimated through various tests in the riverside alluvial layer where a GWHP system was installed. Under different groundwater flow velocities and pumping and injection rates, a sensitivity analysis was performed to evaluate the effect of such properties on the design of open-loop systems. The results showed that hydraulic conductivity and thermal dispersivity of the aquifer are the most sensitive parameters in terms of performance and environmental aspects, and sensitivities of the properties depend on conditions.