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Influence of Heat Treatment on the Antioxidant Compounds and Activities of Non-milled Sorghum
Jung In Kim,Koan Sik Woo,Hye In Seo,Hyun Young Kim,Young Soo Park,Jee Yeon Ko,Jae Saeng Lee,Seuk Bo Song,Tae Wook Jung,Ki Young Kim,Do Yeon Kwak,In Seok Oh,Heon Sang Jeong 한국식품영양과학회 2012 한국식품영양과학회 학술대회발표집 Vol.2012 No.10
Young Saeng Jung,Chang Ho Chae,Young Ouk Kim,Jun Seok Son,Chan Woo Kim,Hyoung Ouk Park,Jun Ho Lee,Young Hoo Shin,Ho Sung Kwak 대한직업환경의학회 2017 대한직업환경의학회지 Vol.29 No.-
Background: Although recent studies have investigated the influence of vitamin D on sleep patterns, there is a lack of research on the relationship between vitamin D and sleep patterns in Korean workers. This study focused on the relationship between serum vitamin D levels and sleep in fixed day indoor field workers in the electronics manufacturing industry in Korea. Methods: The 1472 subjects who were included in this study were selected from fixed day workers in the electronics manufacturing industry who had received a worker’s special health examination at a hospital in Changwon, South Gyeongsang Province between January 2015 and December 2015. Nighttime workers and those who showed symptoms of depression were excluded from this study. The sociodemographic and lifestyle variables of the participants were investigated, including age, sex, marital status, level of education, body mass index, smoking habits, alcohol consumption habits, and regular exercise. Work-related factors were evaluated, such as employee tenure and occupational stress. Serum 25-hydroxyvitamin D was measured as an indicator of vitamin D levels, and quality of sleep was evaluated using the Pittsburgh Sleep Quality Index (PSQI) translated into Korean. Results: The subjects had a mean serum vitamin D level of 13.70 ± 5.93 ng/mL. Vitamin D deficiency, defined as a serum vitamin D level of <10 ng/mL, was found in 24.8% of males and significantly more frequently in females (47.6%). Poor sleep quality was reported by 19.8% of participants with serum vitamin D levels ≥10 ng/mL and by 21.7% of those with serum vitamin D levels <10 ng/mL, which was a significant difference (P = .007). Multiple logistic regression analysis adjusting for significant variables found that poor sleep quality was more likely in those with vitamin D deficiency than those with higher serum vitamin D levels (odds ratio = 1.36; 95% CI, 1.01–1.82). A comparison of serum vitamin D levels and PSQI components showed that the mean scores for subjective sleep quality, sleep latency, and sleep duration were significantly higher in the vitamin D-deficient participants, indicating that the vitamin D-deficient participants had poorer sleep quality. Conclusions: This study investigated serum vitamin D levels in fixed day indoor field workers in the manufacturing industry in Korea and analyzed the relationship of vitamin D deficiency with sleep quality. A significant correlation was found between serum vitamin D deficiency and poor sleep quality. Based on the results of this study, sleep disorder management for workers can be improved by providing regular examinations checking their serum vitamin D levels and supplying vitamin D to workers with serum vitamin D deficiency to enhance their quality of sleep.
정영권(Young-Kwon Jung),이호생(Ho-Saeng Lee),김현주(Hyeon-Ju Kim),윤정인(Jung-In Yoon) 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
Plate heat exchanger is being applied in the field of marine plants and chemical industry, such as OTEC and SWAC equipment. The study aims to interpret the thermal and pressure drop characteristics of plate heat exchangers to determine the geometric design parameters such as the channel space. In this study, heat transfer performance was numerically studies with respect to the flow pattern and channel space. The results from numerical analysis indicated that the j factor was linearly decreased with flow reate over every case. As the flow increases within channel spaces, the j factor was found to be decreased linearly. And the f factor is linearly decreasing with the increase of mass flow rate. The f factor was constant with flow rate over every case. As the flow increased within channel spaces, the f factor was found to be constant.
R32, R22에 따른 판형 열교환기의 전열 특성에 대한 실험적 연구
정영권(Young-Kwon Jung),김현주(Hyeon-Ju Kim),이호생(Ho-Saeng Lee),윤정인(Jung-In Yoon) 한국해양환경·에너지학회 2014 한국해양환경공학회 학술대회논문집 Vol.2014 No.5
해양온도차발전에 사용되는 판형 열교환기의 재질은 해수의 특성상 고가의 티타늄을 많이 사용하고 있어, 제작비용의 상승의 주요 원인이 되고 있다. 이에 티타늄을 대체할 소재 및 코팅에 대한 연구도 진행중에 있다. 이에 본 논문에서는 여러 재질의 판형 열교환기에 대해서 냉매별로 열전달 및 압력강하 특성을 파악하고자 하였다. 실험에 사용된 열교환기의 재질은 티타늄, 스테인리스 등이며, 냉매는 R22와 R32를 사용하였다. 실험결과의 분석은 수정된 wilson plat 방법을 이용하여 분석하였다. 그 결과 냉매에 따른 응축/증발 열전달계수는 새로운 코팅방식이 적용된 판형 열교환기가 기존의 티타늄보다 높게 나타났다. In this study, we investigated the heat transfer and pressure drop characteristics of a plate heat exchanger in ocean thermal energy conversion (OTEC) system. We used deep seawater, surface seawater, and refrigerants (R22 and, R32) as heat and cooling sources. Our experiment was performed under the same conditions as those of and actual OTEC system : condensation temperatures of 8~20°C and 5~17°C for the deep seawater and refrigerant, respectively, and evaporation temperatures of 10~40°C and 13~45°C for the surface seawater and refrigerant, respectively. The experiments were performed in several operation modes of condensation and evaporation. The mass flow rates of the deep seawater, surface seawater, and refrigerant were varied over the rage of 60~90% of the total mass flow rate. The plates were made of titanium, stainless steel, nitride-coated New, Teflon-coated stainless steel, and DLC-coated stainless steel. The local and average heat transfer coefficients and pressure drops during condensation and evaporation were reported for R22 and R32 in the plate heat exchanger.
반용접식 판형 열교환기내 R22, R32 및 R32+R152a의 전열특성에 관한 연구
정영권(Young-Kwon Jung),김현주(Hyeon-Ju Kim),이호생(Ho-Saeng Lee),윤정인(Jung-In Yoon) 한국해양환경·에너지학회 2014 한국해양환경공학회 학술대회논문집 Vol.2014 No.11
해양온도차발전에 사용되는 판형 열교환기의 재질은 해수의 특성에 적합한 고가의 티타늄을 많이 사용하고 있어, 비용의 상승의 주요 원인이다. 티타늄을 대체할 소재 및 코팅에 대한 연구도 진행중에 있다. 이에 본 논문에서는 여러 재질의 판형 열교환기에 대해서 냉매별로 열전달 특성을 파악하고자 하였다. 실험에 사용된 열교환기의 재질은 티타늄, 스테인리스 등이며, 냉매는 R22를 기본으로 하였으며 R22를 대체하기 위한 냉매로 R32와 혼합냉매 R32+R152a를 사용하였다. 실험결과의 분석은 수정된 wilson plat 방법을 이용하여 열전달 특성을 분석하였다. 그 결과 모든 냉매에 대해서 응축/증발 열전달계수는 새로운 코팅방식이 적용된 판형열교환기가 기존의 티타늄보다 높게 나타났다. In this study, we investigated the heat transfer characteristics of a plate heat exchanger in ocean thermal energy conversion (OTEC) system. We used deep seawater, surface seawater, and refrigerants (R22, R32 and R32+R152a) as heat and cooling sources. Our experiment was performed under the same conditions as those of and actual OTEC system : condensation temperatures of 8~20°C and 5~17°C for the deep seawater and refrigerant, respectively, and evaporation temperatures of 10~40°C and 13~45°C for the surface seawater and refrigerant, respectively. The experiments were performed in several operation modes of condensation and evaporation. The mass flow rates of the deep seawater, surface seawater, and refrigerant were varied over the rage of 60~90% of the total mass flow rate. The plates were made of titanium, stainless steel, nitride-coated New, Teflon-coated stainless steel, and DLC-coated stainless steel. The local and average heat transfer coefficients during condensation and evaporation were reported for R22, R32 and R32+R152a in the plate heat exchanger.
Quality Characteristics of Wet Noodles Combined with Sorghum (Sorghum bicolor L. Moench) Powder
Hyun Young Kim,Hye In Seo,Koan Sik Woo,Jee Yeon Ko,Jung In Kim,Jae Saeng Lee,Seuk Bo Song,Tae Wook Jung,Ki Young Kim,Do Yeon Kwak,In Seok Oh,Heon Sang Jeong 한국식품영양과학회 2012 한국식품영양과학회 학술대회발표집 Vol.2012 No.10
Analysis of the high-efficiency EP-OTEC cycle using R152a
Yoon, Jung-In,Seol, Sung-Hoon,Son, Chang-Hyo,Jung, Suk-Ho,Kim, Young-Bok,Lee, Ho-Saeng,Kim, Hyeon-Ju,Moon, Jung-Hyun Elsevier 2017 RENEWABLE ENERGY Vol.105 No.-
<P><B>Abstract</B></P> <P>Ocean thermal energy conversion (OTEC) cycles utilize renewable, eco-friendly heat sources. However, their low system efficiency diminishes their advantages and impedes commercialization opportunities. In this study, a liquid–vapor ejector and a motive pump are used to enhance the efficiency of the OTEC system through a modified version called the ejector pump OTEC (EP-OTEC) cycle. By applying a liquid–vapor ejector, lower turbine outlet pressure may result than in the basic OTEC cycle. Additionally, the motive pump increases the motive pressure, thereby strongly affecting the performance of the liquid–vapor ejector. The heat source temperature, mass fraction of the motive flow, and motive pressure are varied to analyze the performance characteristics of the EP-OTEC cycle. Firstly, the higher heat source temperature yields greater turbine power for a given mass flow rate in an evaporator. Moreover, results show that the net power of the EP-OTEC cycle is clearly larger than that of the basic OTEC cycle, proving its superiority. The optimized EP-OTEC cycle using R152a yields a system efficiency of 4.0%, which is 38% higher than that of the basic OTEC cycle.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Liquid-vapor ejector and a motive pump were used to enhance the system efficiency of the OTEC, called EP-OTEC. </LI> <LI> By applying the liquid-vapor ejector into the OTEC, the turbine outlet pressure becomes lower than that in the basic OTEC. </LI> <LI> The system efficiency of EP-OTEC was 4.0%, relatively 38% higher than that of the basic OTEC (2.9%). </LI> </UL> </P>
정영권(Young-Kwon Jung),이호생(Ho-Saeng Lee),김현주(Hyeon-Ju Kim),윤정인(Jung-In Yoon) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
Plate heat exchanger is being applied in the field of marine plants and chemical industry, such as OTEC and SWAC equipment. The study aims to interpret the thermal and pressure drop characteristics of plate heat exchangers to determine the geometric design parameters such as the channel space. In this study, heat transfer performance was numerically studied with respect to the flow pattern and channel space. The results from numerical analysis indicated that the j factor was linearly decreased with flow rate over every case. As the flow increased within channel spaces, the j factor was found to be decreased linearly. And the f factor is linearly decreasing with the increase of mass flow rate. The f factor was constant with flow rate over every case. As the flow increased within channel spaces, the f factor was found to be constant.