• 한국산학기술학회논문지
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• 제19권6호
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• pp.154-159
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• 2018

도시가스 회사는 설비의 유지보수 및 점검을 수행할 경우에 가스를 방산하는 경우가 있는데, 가스누출 오인으로 신고 및 주민불안이 발생하게 됨에 따라 활성물질을 통한 천연가스의 부취냄새를 효과적으로 탈취하는 방법을 연구하는데 그 목적을 두었다. 본 연구에서는 천연가스 부취냄새 탈취를 위해 활성물질인 차아염소산나트륨을 이용한 산화법을 통해 천연가스 부취제와 활성물질간 효율적 혼합방법을 위해 간이 탈취방산장치를 제작하여 현장에서 실험을 통해 부취농도를 확인하였다. 탈취실험장치의 기본원리는 방산되는 가스(0.8~1.0MPa)의 에너지를 이용하여 활성물질용액이 첨가되도록 하여 가스 내 부취제와 혼합과정을 거친 후 방출구를 통해 대기로 방산된다. 도시가스 부취제의 활성물질인 차아염소산나트륨을 이용하여 산화반응을 통해 벤츄리와 혼합용기의 직렬연결방식을 적용하여 제작한 장치를 통해 현장에서 효과적으로 부취냄새를 제거할 수 있었다. 하지만, 실질적인 효과를 거두기 위해서는 도시가스의 다량과 고압에서 방산되는 조건에서의 적용하는 문제해결 과제가 남아 있다.

• 대한지역사회영양학회지
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• 제19권6호
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• pp.513-526
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• 2014

Objectives: This study was conducted to investigate the effect of low sodium diet education program on dietary habits, diet quality, and measures of obesity in overweight or obese middle-aged women. Methods: Subjects were 81 individuals aged 45 years or over, who completed an 8-week nutrition education. The subjects were divided into a normal group (N = 30) and an overweight-obese group (N = 51) according to the BMI. The effects were evaluated by anthropometric measurement, biochemical analysis, questionnaire, and diet records before and after the program. Results: Overweight-obese group showed significant decreases in weight (p < 0.0001), BMI (p < 0.0001), percent of body fat (p = 0.0087), waist circumference (p < 0.0001), systolic (p = 0.0003) and diastolic blood pressure (p = 0.0261). Nutrients intakes were not different between the two groups and only sodium intake was decreased after education. Total score of general dietary habits, dietary behavior related to sodium intake, dietary diversity score (DDS), diet variety score (DVS), and diet quality index-international (DQI-I) were improved in both groups compared to the baseline. Overweight-obese group showed significant improvement in 'having fruits everyday', 'having fish everyday', 'trying to eat many kinds of food', 'eating less broth when eating soup, stew, and noodles', 'eating less kimchi and salt-fermented vegetable', and 'propensity to think that dishes should be pretty seasoned'. In addition, moderation of empty calories food (p = 0.0064) and macronutrient ratio (p = 0.0004) were improved in the overweigh-obese group, but in the normal group, the results did not reach statistical significance. Conclusions: These results suggested that low sodium diet education program may contribute to obesity management by improving diet quality and dietary habits in middle-aged women.

• Journal of Nutrition and Health
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• 제38권10호
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• pp.827-835
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• 2005

The purpose of this study was to investigate the relation among mineral intakes, blood pressure, and blood lipids for health management of Korean adults over 20 years old. Subjects were recruited from the district where they lived, which included rural (Yoju, n = 137) , coastal (Taean, n = 100) , and urban district (Suwon, n : 117) . hnthropornekical measurement, blood pressure measurement, dietary intake assessment using 24-hour recall method, and blood collection and analysis of blood lipids were conducted. The average age, height, weight, and BMI were 54.1 years, 168.5 cm, 67.3 kg, and 24.5 kg/$m^{2}$ for men and 53.9 years,153.8 cm,59.2 kg, and 25.0 kg/$m^{2}$ for women, respectively. The mean daily intakes of total food and energy were 1219.1 g and 1740.9 kcal for men and 1071.3 g and 1432.6 kcal for women. The mineral intakes of men and women were 448.5 mg and 400.4 mg for calcium,955.3 mg and 803.7 mg for phosphorus, 13.3 mg and 11.1 mg for iron, 4302.8 mg and 3393.3 mg for sodium,2588.0 mg and 2264.9 mg for potassium, and 8.9 mg and 7.3 mg for zinc. The daily intakes of energy, calcium, zinc, vitamin $B_{2}$, and vitamin I were $76.1\%$, $60.1\%$, $73.1\%$, $68.6\%$, and $80.4\%$ of RDAs, respectively. The intakes of energy, calcium, zinc, vitamin $B_{2}$ and I were not meet Korean RDAs. Especially, calcium, zinc, and vitamin $B_{2}$ were less than $75\%$ of RDAs. Blood pressure of the subjects was 128.3/75.5 mmHg for men and 124.1/73.7 mmHg for women. Serum lipids of men and women were 180.2 mg/dL and 184.9 mg/dL for total cholesterol, 160.8 mg/dL and 137.6 mg/dL for triglyceride,41.5 mg/dL and 44.7 mg/dL for HDL-cholesterol,106.6 mg/dL and 112.7 mg/dL for LDL-cholesterol, and 3.5 and 3.3 for atherogenic index. While serum triglyceride and AI of men was significantly higher, HDL-cholesterol was lower than those of women. In the relation among mineral intakes, blood pressure, and serum lipids, we found a significantly negative correlation of intakes of calcium, calcium/phosphorus, calcium density with systolic blood pressure. There were significantly negative correlation between intake of calcium/phosphorus and serum cholesterol, calcium density and serum cholesterol, sodium intake and serum HDL-cholesterol. Based on these results, we concluded that high intakes of calcium, calcium/phosphorus and low sodium intake were associated with favorable blood pressure and serum lipid profiles in adult men and women. (Korean J Nutrition 38(10): 827$\sim$835,2005)

• 한국식품저장유통학회지
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• 제22권6호
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• pp.859-866
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• 2015

무기이온이 풍부한 생식물 중 버려지는 부산물을 이용하여 미네랄 확보를 위한 발효최적조건을 설정하고 발효물에 함유된 미네랄 여과 및 정제 조건을 확립하였다. 생식물 가공 후 부산물을 활용하여 다량의 미네랄을 확보하고, 생식물 미네랄 배지조성을 위하여 백미 도정 후의 현미부산물인 미강을 고체 발효시켜 열수추출한 결과 칼륨 2,019.2 mg/100 g을 포함한 미네랄을 얻을 수 있었다. 추출물에 대한 순차적인 여과로 칼륨 1,769.70 mg/100 g을 포함한 미네랄을 확보하여 정제한 후 미네랄을 염수와 치환하기 위한 조건을 확립하기 위하여 유량과의 상관관계를 알아본 결과 유량이 변화하여도 전기투석효과에 영향이 없었으며, 유속이 200 mL/L로 빠를 때 생산제품인 정제수실 반응액이 농도가 낮게 나타났다. 인가전류와의 상관관계에서는 전류를 높게 인가할수록 전기투석효과가 높게 나타났고, 그 증가곡선도 역포물선으로 인가전류가 높을수록 효율이 높음을 나타냈다. 시간과의 상관관계 결과 90분 이내에 95%의 추출액 이온이 정제수로 회수 되었으며 비례적으로 추출 이온별 농도의 변화가 있었다. 정제수실의 이온 농축수에 정제염수실에서 조성된 수산화나트륨을 혼합하여 pH 7.4 의 안전한 염화화합물을 조성할 수 있게 되었다. 전기투석 공정의 원리를 이용하여 생식물 발효 조성액에 함유된 미네랄을 정제염수와 이온치환하여 나트륨 함량 40% 대비 최저 5.7%~최고 30%까지 나트륨이 감량된 소금을 제조하여 미네랄 저염소금 개발 가능성을 확인할 수 있었다.

• 조명전기설비학회논문지
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• 제15권1호
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• pp.7-12
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• 2001

기구 배광이 전체적인 조명환경에 미치는 영향은 크며, 기구배광은 반사판, 프리즘 설계 등으로 구현된다. 램프의 물리적 크기는 기구설계에 큰 영향을 미치기 때문에 램프에 의한 배광의 변화와 램프로 흡수되는 빛을 고려하여 기구를 설계하여야 한다. 기존의 반사파 설계 알고리즘의 경우 램프의 물리적인 크기를 고려하지 않았으며, 기구배광의 출력값도 몇몇의 경우에서는 오차가 발생하였다. 이에 본 논문에서는 램프의 크기를 고려한 반사판설계 알고리즘을 개발, 구현하여 이전의 기구설계 알고리즘이 가지고 있던 오차를 줄였으며 좋은 성과를 얻었다.

• Membrane and Water Treatment
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• 제9권2호
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• pp.87-94
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• 2018

The interactions of water soluble polymers with dye are studied by ultrafiltration using a molecular weight cut off of 10 KDa regenerated cellulose ultrafiltration membrane. Two water-soluble polymers, namely Poly (Sodium-4 Styrenesulfonate) (PSS) and Poly (Vinyl Alcohol) (PVA) were selected for this study. The effects of process parameters, such as, polyelectrolyte concentrations, transmembrane pressure, ionic strength and pH of solution on dye retention and permeation flux were examined. PSS enhanced ultrafiltration achieved dye retention as high as 99% as a result of complexation between polyanion containing aromatic groups and cationic dye. This result was confirmed by the red shift. The retention of dye decreases as the salt concentration increases, a high retention was obtained at pH above 4. However, in case of PVA, relatively low retention (50%) was observed. Ionic strength and pH has no significant effect on the removal of MB. The permeate flux depended slightly on polyelectrolytes concentrations, transmembrane pressure, salt concentration and pH.

• Nuclear Engineering and Technology
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• 제54권12호
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• pp.4412-4421
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• 2022

The pressure measurement in the high-temperature liquid metal system, such as Sodium-cooled Fast Reactor(SFR), is important and yet it is very challenging due to its nature. The measuring pressure is relatively at low range and the applied temperature varies in wide range. Moreover, the pressure transfer material in impulse line needs to considered the high temperature condition. The conventional diaphragm-based approach cannot be used for it is impossible to remove the effect of thermal expansion. In this paper, the Fiber Bragg Grating(FBG) sensor-based pressure measuring concept is suggested that it is free of problems induced by the thermal expansion. To verify this concept, a prototype was fabricated and tested in an appropriate conditions. The uncertainty analysis result of the experiment is also included. The final result of this study clearly showed that the FBG-based pressure transmitter system is applicable to the extreme environment, such as SFR and any other high-temperature liquid metal system and the measurement uncertainty is within reasonable range.

• 대한지역사회영양학회지
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• 제20권6호
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• pp.433-446
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• 2015

Objectives: This study was performed to evaluate the consumer education program for reducing sodium intake based on social cognitive theory (SCT) and investigate consumer perceptions of environmental, cognitive and behavioral factors. Methods: Consumers (n=4,439) were recruited nationwide in Korea to participate in a nutrition education program for reducing sodium intake which was targeted on senior housewives (SH), parents (P), and office workers (OW). Questions regarding main factors of SCT were asked both before and after the education program. Results: SH and P recognized external social efforts and information to reduce sodium including nutrition labeling more than OW. The main barriers to practice reducing sodium intake were limited choice of low sodium food and menu, interference with social relationship when dining with others, and limited information, knowledge and skills. SH had lower barriers to practice reducing sodium intake and OW perceived 'preference to soup or stew' and 'preference to Kimchi, salted fish and fermented sauces' as barriers more than other groups at the baseline. Less than 50% of participants knew the relationship between sodium and salt, sodium in nutrition labeling, and recommended sodium intake. In addition, OW had little knowledge for capability to reduce sodium intake and lower self-efficacy to practice compared with SH and P. After education, positive outcome expectations such as lowering blood pressure, prevention of cardiovascular disease and osteoporosis were increased and barriers to practice reducing sodium intake were decreased in all groups (p < 0.05). The knowledge for behavioral capability and self-efficacy to reduce sodium intake were also improved but OW had still lower scores compared with other groups. Conclusions: These results suggested that nutrition education programs could be an effective tool to impact general population by facilitating awareness and increased capability to reduce sodium intake.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2005년도 춘계학술대회논문집
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• pp.178-180
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• 2005

본 논문에서는 65 [W] 저압나트륨램프용 전자식 안정기를 제작하여 전기, 광학적 특성을 측정하였다. 개발한 전자식 안정기는 구동주파수가 200 [kHz]로, 기존의 25 [kHz] 전자식 안정기에 비하여 20% 이상의 효율향상을 달성하였다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 1999년도 학술대회논문집-국제 전기방전 및 플라즈마 심포지엄 Proceedings of 1999 KIIEE Annual Conference-International Symposium of Electrical Discharge and Plasma
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• pp.247-249
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• 1999

본 논문에서는 91[W] 저압 나트륨 램프용 고효율 전자식 안정기를 제작하여 전기적 특성을 측정하였다. 개발된 고효율 전자식 안정기는 입력 전압 220[V], 입력 전류 435[mA], 입력 전력 94[W], 역률은 98[%], 전류 고조파 함유율 19[%]로 측정되었다.