• Nuclear Engineering and Technology
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• 제13권3호
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• pp.168-175
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• 1981

• 한국막학회:학술대회논문집
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• 한국막학회 2000년도 추계 총회 및 국제학술발표회
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• pp.75-78
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• 2000

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2005년도 추계학술발표회
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• pp.79-80
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• 2005

• 에너지공학
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• 제23권1호
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• pp.81-89
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• 2014

The purpose of this study is to obtain low-emission and high-efficiency in LPG engine with hydrogen enrichment. The objective of this paper is to clarify the effects of hydrogen enrichment in LPG fuelled engine on exhaust emission, thermal efficiency and performance. The compression ratio of 8 was selected to avoid abnormal combustion. To maintain equal heating value of fuel blend, the amount of LPG was decreased as hydrogen was gradually added. The relative air-fuel ratio was increased from 0.76 to 1.5, and the ignition timing was controlled to be at minimum spark advance for best torque (MBT).

• 한국자동차공학회논문집
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• 제12권2호
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• pp.9-16
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• 2004

Close-coupled catalyst (CCC) can reduce the engine cold-start emissions by utilizing the energy in the exhaust gas. However, in case the engine is operated at high engine speed and load condition, the catalytic converter may be damaged and eventually deactivated by thermal aging. Excess fuel is sometimes supplied intentionally to lower the exhaust gas temperature avoiding the thermal aging. This sacrifices the fuel economy and exhaust emissions. This paper describes the results of an exhaust heat exchanger to lower the exhaust gas temperature mainly under high load conditions. The heat exchanger was installed between the exhaust manifold and the inlet of close-coupled catalytic converter. The exhaust heat exchanger successfully decreased the exhaust gas temperature, which eliminated the requirement of fuel enrichment under high load conditions. However, the cooling of the exhaust gas through the heat exchanger may cause the deterioration of exhaust emissions at cold start due to the increment of catalyst light-off time.

• 한국연소학회:학술대회논문집
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• 한국연소학회 제26회 KOSCO SYMPOSIUM 논문집
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• pp.247-253
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• 2003

Burning velocities of conventional methane flame and oxygen-enriched methane flame were determined by experimentally and numerically at atmospheric pressure in order to examine the validity of various detailed reaction mechanisms in oxygen-enriched flame. The schlieren system was adopted to obtain the burning velocity of flame stabilized on a circular nozzle. Premix code was employed to compute the burning velocity. Three reaction mechnisms were tested at several oxygen enrichment level, whose names are GRI 3.0, MB(Miller and Bowman) and LKY(Lee Ki Yong) reaction mechanism. Sensitivity analysis was also performed to discriminate dominantly affecting reaction on burning velociy. The results showed that conventional reaction mechanisms originally based on methane-air flame were underpredict the burning velocity at high oxygen-enrichment level. The modified GRI 3.0 reaction mechanism based on our experimental results was suggested and shows a good agreement in estimating the burning velocity and the NO number density of oxygen-enriched flame.

• 가정과삶의질연구
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• 제14권4호
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• pp.13-26
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• 1996

Based on the conceptual framework of Double ABCX model of family stress and adaptation this study developed the enrichment program for the relationship of young daughters-in-law with their mothers-in-law. Results of empirical research concerning the relationship between them also provided for the basis of designing this program. Consisting of 6 sessions this education program was delivered to 20 young daughters-in-law in a rural area of Kyunggi-do province. The effectiveness of the program was evaluated through one-group posttest design and follow-up interview. Overall most participants in the program reported that the relationship with their mothers-in-law was enhanced in terms of understanding mothers-in-laws psychology and roles of improving communication and problem-solving skills self-control and of blaming.

• PNF and Movement
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• 제6권2호
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• pp.39-50
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• 2008

Purpose : This article reviewed the advances in the understanding of the effect of motor rehabilitation and brain plasticity on functional recovery after CNS damage. Methods : This is literature study with Pubmed, Medline and Science journal. Results : The inability of CNS neurons to regenerate is largely associated with nonneuronal aspects of the CNS environment. Especially, this neuronal growth inhibition is mediated by myelin associated glycoprotein, olygodendrocyte-myelin glycoprotein, and NOGO. Enriched environment, motor learning, forced limb use have been utilized in scientific studies to promote functional reorganization and brain plasticity. Especially, enriched environment and motor enrichment may prime the brain to respond more adaptively to injury, in part by expressed neurotrophic factors. Conclusions : These reviews suggest that activity-induced neural plasticity occur in damaged brain areas in order to functional reorganization, where it could contribute to motor recovery, and represent a target for stroke rehabilitation.

• 자원환경지질
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• 제19권spc호
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• pp.103-112
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• 1986

The geology of the mine consists of Cretaceous lower andesitic breccia member, tuffaceous black shale, upper tuffaceous sandstone member and andesitic dike. Ore bodies are two parallel veins of breccia originated from hydrothermal activity of later acidic igneous intrusion. First two periods of mineralization, gold and silver, and copper, and later copper enrichment was identified. The first two might have been occurred during boiling of hydrothermal solution that formed breccia and copper enrichment was accomplished by enhancement of $CO_2$ fugacity from the organic material contained in the black shale. With all the geologic and mineralogic data and inferences attained from other investigators it was estimated that the optimum depth of the ore mineralization was between 500m and 300m below the surface of Kyong-Sang series.

• 대한가정학회지
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• 제37권8호
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• pp.29-42
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• 1999

The purpose of this study was to develop the new marital intimacy enrichment program. Some family counselors(or therapists) and 3 couples'interviewees helped to design this program. This program intended to increase couples to understand one's personality, feeling, and behavior each other. For the purpose of it, two psychological theories and two family therapy theories were provided for the base of this program. This program is consisted of 6 sessions that are Sharing, Real Understanding of Our Personalities 1, Understanding of Our Personalities H, Understanding of Our family of Origins and Habits, Understanding of Our Recent Life, and Understanding of Our Feelings, aiming for increasing couple's cognitive, affective, and sexual intimacy.