고령자를 위한 영양강화 유제품 개발 II. 고령자 영양강화 적용 기술 현황

김범근,장혜원,최가희,문용일,오세종,박동준 한국낙농식품응용생물학회 2019 Journal of Dairy Science and Biotechnology (JMSB) Vol.37 No.4

Milk and dairy products are the high value foods for the elderly population. In particular, fermented milk is the best source of calcium for people in the specific age group of over 79 years. It provides a good source of protein. Regular exercise and active lifestyle are recommended to slow down the muscle loss. However, exercising without proper nutrient intake is simply not sufficient at this age. Milk and dairy products provide the iron and protein content required for effective exercise-assisted growth. Milk nutrients have the advantage of being produced in various food forms, such as liquid, semi-solid, and powder types. Fat-soluble vitamins such as retinol and vitamin K can be encapsulated using various technologies for milk and dairy products. Using the encapsulation method, spray drying and fluidized-bed coating have been used for adding the micro-nutrients to the food. Microencapsulation technology is being applied in case of the fermented dairy products too. In particular, various wall materials are being developed to enhance the viability of probiotics. In the near future, advanced high-efficiency technologies that can effectively nourish the dairy products with nutrients will be developed to produce targeted high-nutrition value food for the elderly.

ESTIMATION OF RESIDUAL STRESS IN CYLINDER HEAD

김범근,A. EGNER-WALTER,H. CHANG 한국자동차공학회 2006 International journal of automotive technology Vol.7 No.1

Residual stresses are introduced in aluminum cylinder head during quenching at the end of the T6 heattreatment process. Tensile residual stress resulted from quenching is detrimental to fatigue behavior of a cylinder head when it is overlapped with stresses of engine operation load. Quenching simulation has been performed to assess the distribution of residual stress in the cylinder head. Analysis revealed that in-homogeneous temperature distribution led to Measurements of residual stress have been followed and compared with the calculated results. Results successfully proved that high tensile residual stress, which was large enough to accelerate fatigue failure of the cylinder head, are formed during quenching process at the end of heat treatment at the same critical position. Effect of quenching parameters on the distribution of residual stress in cylinder head has been investigated by choosing different combination of heat treatment parameters. It was demonstrated that changes of quenching parameters led to more homogeneous temperature distribution during cooling and could reduce tensile residual stress at the critical region of the cylinder head used in this study.

고령친화식품의 가공기술 연구 동향

김범근 한국산업식품공학회 2019 학술대회 및 심포지엄 Vol.2019 No.10

터보 디젤 엔진용 배기매니폴드의 열변형 해석

김범근,이은현,최복록 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.3

[P9-14] 감잎차와 녹차의 항산화 및 항균활성 비교

김범근,박찬은,박기재,임정호,김종찬,정승원,정진웅 한국식품영양과학회 2008 한국식품영양과학회 학술대회발표집 Vol.2008 No.10

식품산업에서의 3D 프린팅 및 저작 로봇 기술

김범근 한국농업기계학회 2017 한국농업기계학회 학술발표논문집 Vol.22 No.2

DURABILITY IMPROVEMENT OF A CYLINDER HEAD IN CONSIDERATION OF MANUFACTURING PROCESS

김범근,H. CHANG,K. LEE,C. KIM 한국자동차공학회 2007 International journal of automotive technology Vol.8 No.2

The durability of a cylinder head is influenced by the thermal and mechanical history during the manufacturing process, as well as engine operation. In order to improve the durability of cylinder head, both load from engine operation and the preload conditions from the manufacturing process must be considered. The aluminum cylinder head used for a HSDI diesel engine is investigated to reduce the possibility of high cycle fatigue crack in this study. FE analysis is performed to elucidate the mechanism of high cycle fatigue crack in the HSDI diesel cylinder head. Two separate approaches to increase the durability of the cylinder head are discussed: reducing load from engine operation and re-arranging preload conditions from the manufacturing process at the critical location of the cylinder head. Local design changes of the cylinder head and modification of pretension load in the cylinder head bolt were investigated using FE analysis to relieve load at the critical location during engine operation. Residual stress formed at the critical location during the manufacturing process is measured and heat treatment parameters are changed to re-arrange the distribution of residual stress. Results of FE analysis and experiments showed that thorough consideration of the manufacturing process is necessary to enhance the durability of the cylinder head.

연안 퇴적물에서 인의 존재형태가 용출 특성에 미치는 영향에 대한 연구

김범근,모하메드아케트키룰,권성현 한국환경생태학회 2019 한국환경생태학회지 Vol.33 No.2

This study investigated the effect of the sediment phosphorus fraction sampled from the southern coast of Korea on the release characteristics of sediments by environmental changes of water quality. We conducted the release experiment in the laboratory for 20 days and measured the phosphorus fraction properties, the environmental factors of water quality, and the release rate of total phosphorus. The results showed a decrease in dissolved oxygen by the growth of microorganisms in the water layer, leading to the anaerobic condition in which the redox potential of the sediments decreased. As such, the decreasing variability of phosphates bonded to iron oxide in the sediment phosphorus was higher after 20 days of the release experiment than the first day. 본 연구는 남해 연안에서 채취한 퇴적물을 대상으로 수질의 환경변화에 의해 퇴적물이 용출 특성에 미치는 영향을파악하기 위해 실험실에서 20일 동안 용출 배양실험을 진행하였으며, 퇴적물 인의 존재형태와 수질의 환경 인자, 총 인의 용출률을 측정하였다. 관찰 결과, 수층에서 미생물의 성장에 의해 용존 산소가 감소하여, 퇴적물의 산화환원전위가 낮아지는 혐기성환경이 진행되었다. 그에 따라 배양 초기일과 20일 후를 비교하면, 퇴적물 인의 존재 형태 중철 산화물과 결합한 인산염의 감소하는 변동성이 높게 나타났다. 이는 철 산화물이 환원될 경우 금속 이온과 분리된무기인이 수중으로 이동하는 것을 의미하는데, 분리된 무기인은 플랑크톤에 의해 잘 흡수되는 특성을 가진다. 수층의총 인을 분석한 결과 20일 차 0.304mg/L까지 지속적으로 증가하였으며, 산정된 용출률의 경우 배양 5일 이후 용존산소의 감소와 높은 관계성을 보였다. 따라서 본 연구의 결과로부터, 수층의 부영양화를 관리하기 위한 요소로서 수질의용존 산소와 퇴적물 인의 존재형태 중 철 산화물의 중요성을 확인할 수 있었다.

연안 저질 SOD의 특성과 유발 영향인자에 대한 상관관계

김범근,모하메드아케트키룰,권성현,조대철 한국환경생태학회 2019 한국환경생태학회지 Vol.33 No.5

본 연구는 퇴적물이 소모하는 산소량(SOD)과 환경 인자가 서로 미치는 영향을 파악하기 위해 퇴적물 배양실험을 수행하였다. 이를 위해 실험실에서 용출 반응조를 설치하여 20일간 배양하였으며, 퇴적물에 존재하는 물질 중 P 및 Fe와의 관계를 중점적으로 연구하였다. 분석 결과, 수층의 용존 산소는 시간의 경과에 따라 감소하는 경향을 나타냈으며, 퇴적물의 산화환원전위 또한 음의 방향으로 진행되어 혐기적 환원환경이 조성되었다. 퇴적물 산소요구량(SOD)은 배양 초기 0.05mg/g로 측정되었 으며, 20일차 0.09mg/g으로 퇴적물이 소모하는 산소량이 증가하는 경향을 관찰하였다. 이는 chl-a의 증가로 퇴적물 표층에 축적된 유기물의 분해에 의한 산소 소모(Biological-SOD), 그리고 환원반응에 의해 생성된 금속 환원물이 재산화 할 경우 소모되는 산소(Chemical-SOD)에 의한 것으로 보인다. 퇴적물에서 추출한 존재형태별 인과 SOD의 상관관계를 살펴보면 Ex-P, Org-P의 경우 양의 상관관계, Fe-P의 경우 음의 상관관계를 나타내었다. 또한, 실험 20일차 퇴적물의 미생물 군집을 분석한 결과 혐기성 철 환원균(FeRB)이 우점종으로 검출되었다. 따라서, 철 산화물과 결합한 인산염이 환원반응에 의해 분리될 경우 인산염은 수중으로 용출되어 일차생산력을 증가시키며, 환원물은 재산화 하여 퇴적물 산소 소모량에 기여하므로 본 연구는 산소 수지의 개선을 위한 기초 자료로 이용될 것으로 기대된다. This study conducted a sediment culture experiment to investigate the effects of sediment oxygen demand (SOD) and environmental factors on sediment and water quality. We installed a leaching tank in the laboratory, cultured it for 20 days, and analyzed the relationship between P and Fe in the sediment. As a result, the dissolved oxygen of the water layer decreased with time, while the oxidation-reduction potential of the sediment progressed in the negative direction to form an anaerobic reducing environment. The SOD was measured to be 0.05 mg/g at the initial stage of cultivation and increased to 0.09 mg/g on the 20th day, indicating the tendency of increasing consumption of oxygen by the sediment. The change is likely to have caused by oxygen consumption from biological-SOD, which is the decomposition of organic matter accumulated on the sediment surface due to the increase of chl-a, and chemical-SOD consumed when the metal-reducing product produced by the reduction reaction is reoxidized. The correlation between SOD and causality for sediment-extracted sediments was positive for Ex-P and Org-P and negative for Fe-P. The analysis of the microbial community in the sediment on the 20th day showed that anaerobic iron-reducing bacteria (FeRB) were the dominant species. Therefore, when the phosphate bonded to the iron oxide is separated by the reduction reaction, the phosphate is eluted into the water to increase the primary productivity. The reduced substance is reoxidized and contributes to the oxygen consumption of the sediment. The results of this study would be useful as the reference information to improve oxygen resin.

Finite Element Modeling and Parametric Study of an Automotive V-belt Pulley for Durability Improvement

김범근 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.

This paper presents an analysis of the geometric configuration and loading conditions influencing the durability of an automotive Vbelt pulley. Following the analysis steps specified in a previous studies [Proc. IMechE Part D. Vol. 223, 1301-1309 (2009), Int. J. Auto. Tech..Vol. 10, 73-77 (2009)], the fatigue life of a V-belt pulley was predicted under various conditions. The stress history of the pulley during operation was determined by performing consecutive static analyses on the pulley as it rotated. Using the stress history data calculated from finite element (FE) analysis, the damage over one pulley rotation was calculated, and the fatigue life and number of rotations to failure were estimated. A durability test was performed to compare with the analysis results for a reference analysis case. To determine the design factors affecting the durability, four parameters were evaluated: the contact angle between the pulley and belt, the contact depth of the belt, the distance between the bolt fastening face and the grooved rim area, and the bolt fastening load. The results revealed that a decrease in these parameters increased the durability of the pulley.