• Journal of Nutrition and Health
• /
• 제21권4호
• /
• pp.253-259
• /
• 1988

Riboflavin, Ascorbin Acid & Vitamin D status of 74 elderly Korean (35 men and 39 women)from urban households in Incheon were evaluated by blood analysis. Mean EGR-AC value of men was 1.05 while that of women was 1.03. Marginal deficiency of riboflavin(EGR-AC 1.15-1.35) was shown in 33.3% of men and 20% of women. Average plasma ascorbic acid contents of subjects were very low and men had significantly lower amount than women(0.23mg/㎗ vs 0.44mg/㎗). The percentages of subjects who had plasma ascorbic acid less than 0.4mg/㎗ were 88.9% of men and 45% of women. Mena serum Calcium, Inorganic phosphate contents and mean serum ALP activity of men were 9.97mg/㎗, 3.28mg/㎗ and 61.85 Unit/L respectively and those of women were 9.78mg/㎗, 3.49mg/㎗ and 67.80Unit/L respectively. From these results, Vitamin D status of subjects was considered to be normal.

• 대한안전경영과학회지
• /
• 제16권3호
• /
• pp.185-194
• /
• 2014

Internal engine is the main power source of vehicle and is the main source of air pollution. To satisfy this getting rigorous emission regulation, it must be solved simultaneously the dilemma of reducing emission gas and increasing heat efficiency. Diesel engine is preferred compare with gasoline engine in aspect of energy consumption but it must be solved reducing the containing of NOx, CO and HC. In this study: 1. Looking for alternative of performance improvement of Exhaust Gas Recirculation(EGR) which is emission gas reduction system. 2. Reducing malfunction of controlling emission gas. 3. Made possible precision control.

• 한국생명과학회:학술대회논문집
• /
• 한국생명과학회 2007년도 제48회 학술심포지움 및 추계국제학술대회
• /
• pp.43.1-43.1
• /
• 2007

See Full Text

• 한국자동차공학회논문집
• /
• 제15권4호
• /
• pp.178-185
• /
• 2007

A study is improvement of power and emission in a inline-pump Dr diesel engine by using Dimethyl ether Fuel. Dimethyl ether (DME) is an oxygenated fuel with a cetane number higher than that of diesel oil. It meets the ULEV emission regulation and reduces the smoke to almost zero when used in a diesel engine. But NOx emission is almost same and CO, THC emissions are lower than that of diesel engine. The emissions aren't satisfied the stronger emission regulation in the further. Generally DOC (Diesel Oxidation Catalyst) is used to reduce CO & THC emissions and EGR (Exhaust Gas Recirculation) system is used to reduce NOx emission. Test results showed that the torque and the power with DME were almost same as those of pure diesel oil, but the brake thermal efficiency increased a little. also the BSEC (Brake Specific Energy Consumption) with DME was similar that of diesel. The test results showed that the DOC was the vary effective method to reduce the CO emission in case of Dimethyl Ether Fuel in diesel engine. But, THC emission is showed a little reduction rates. Also EGR system was the very effective method to reduce the NOx emission in case of Dimethyl Ether Fuel in diesel engine.

• 대한안전경영과학회:학술대회논문집
• /
• 대한안전경영과학회 2012년 추계학술대회
• /
• pp.245-252
• /
• 2012

Internal engine is the main power source of vehicle and is the main source of air pollution. To satisfy this getting rigorous emission regulation, it must be solved simultaneously the dilemma of reducing emission gas and increasing heat efficiency. Diesel engine is preferred compare with gasoline engine in aspect of energy consumption but it must be solved reducing the containing of NOx, CO and HC. In this study 1. Looking for alternative of performance improvement of Exhaust Gas Recirculation(EGR) which is emission gas reduction system, 2. Reducing malfunction of controlling emission gas 3. Made possible precision control.

• 한국자동차공학회논문집
• /
• 제10권3호
• /
• pp.8-17
• /
• 2002

In this study, it was tried to analyze not only total hydrocarbon but individual hydrocarbon components from C$_1$to C$\sub$6/ in exhaust gas using gas chromatography to seek the reason fur remarkable differences of smoke emission of diesel fuel, esterfied rice bran oil and blended fuel(esterfied rice bran oil 20vo1-% + diesel fuel 80vo1-%). Individual hydrocarbons(C$_1$ ∼C$\sub$6/) as well as total hydrocarbon of esterfied rice bran oil is reduced remarkably compared with diesel fuel. Although smoke emission of esterfied rice bran oil reduced remarkably compared with commercial diesel fuel, NOx emission of esterfied rice bran oil and blended fuel was increased slightly at high loads and speeds. And, it was tried to reduced NOx emission of them by exhaust gas recirculation(EGR) method. Simultaneous reduction of smoke and NOx emission was achieved with the combination of esterfied rice bran oil and EGR method in consequence.

• International Journal of Automotive Technology
• /
• 제5권3호
• /
• pp.195-200
• /
• 2004

This paper is concerned with the Homogeneous Charge Compression Ignition (HCCI) engine as a new concept in engines and a power source for future automotive applications. Essentially a combination of spark ignition and compression ignition engines, the HCCI engine exhibits low NOx and Particulate Matter (PM) emissions as well as high efficiency under part load. The objective of this research is to determine the effects of Exhaust Gas Recirculation (EGR) rate on the combustion processes of HCCI. For this purpose, a 4-cylinder, compression ignition engine was converted into a HCCI engine, and a heating device was installed to raise the temperature of the intake air and also to make it more consistent. In addition, a pressure sensor was inserted into each of the cylinders to investigate the differences in characteristics among the cylinders.

• KDI Journal of Economic Policy
• /
• 제29권3호
• /
• pp.1-28
• /
• 2007

본고의 분석 결과 지니계수와 양극화지수가 이론적으로는 상이하나, 실증적으로는, 상관관계를 통해서 볼 때, 다른 지수라 보기 어렵다는 점이 확인되었다. 또한 DER지수의 추정을 통해 한국소득분포의 극화를 추정한 결과도 외환위기 전후로 소득분포의 극화가 지니계수로 측정되는 소득불평등도보다 심화되었다고 여길 수 없음이 확인되었다.

• 한국공작기계학회논문집
• /
• 제12권6호
• /
• pp.104-111
• /
• 2003

In order to collect the engine performance data and determine optimum engine conditions, engine performance test based on interface unit were tested This paper was carried out that engine' performance was developed using interface unit between personal computer and diesel engine. The results of the study are summarized as follows: Interface unit was developed. By using PAL, simulation was carried in order to logic's inspection. From this tea NO$_{x}$ were decreased, otherwise PM were increased. By using EGR system PM were increased by twice in the high load ranges, it was not seen to come into effect in the low load ranges. This system was tested D-l3 mode, the results were decreased more than 50% in the NO$_{x}$ emission.

• 대한기계학회논문집B
• /
• 제25권11호
• /
• pp.1509-1517
• /
• 2001

An experimental and numerical analysis were conducted to investigate the transient temperature distribution and flame propagation characteristics over an inline polystyrene spheres under microgravity. From the experimental, a self-ignition temperature of polystyrene bead was 872 K under gravity. Flame spread rates were 4.7-5.1 mm/s with ambient gas N$_2$and 2.3-2.5 mm/s with ambient gas CO$_2$, respectively. Flame radius diameters were 17 mm with ambient gas N$_2$and 9.6 mm with ambient gas CO$_2$, respectively. These results suggest that the flame propagation speed could be affected in the Diesel engine and the boiler combustor by EGR. In terms of the flame spread rate and the transient temperature profile, numerical results have the qualitative agreement with the experiment.