• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.361-361
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• 2011

하나로 냉중성자원(CNS: Cold Neutron Source)은 원자로 수조내 반사체 탱크에 위치한 수직 조사공에 설치되어 하나로 노심에서 발생하는 열중성자를 감속재인 액체 수소층을 통과시켜 냉중성자를 생산한다. 생성된 냉중성자는 유도관을 통하여 냉중성자 산란장치에 공급되어 이용 연구에 활용된다. 감속재로 사용되는 수소는 헬륨냉동계통의 운전에 따라 수소가 수조내기기 집합체(IPA: In Pool Assembly) 내로 이동되어 액화되어지므로, 극저온의 헬륨가스의 흐름이 중요하다. 헬륨냉동기에 의해 만들어진 극저온인 헬륨은 IPA 내의 수소와 열교환을 하기 위해서 배관을 통해 이동되며, 열손실없이 전달하기 위하여 헬륨 배관은 진공층이 형성된 이중배관으로 설계되어 있다. 헬륨 이중배관은 공급 및 회수 배관으로 구성되어 있으며, 헬륨 배관의 외관에 진공층을 20개의 구간으로 나누어 제작 및 설치되었으며, 각각의 진공도를 유지하고 있다. 이 논문에서는 하나로 냉중성자원 헬륨 이중배관의 특성과 헬륨냉동계통의 운전 및 정지시 온도 변화에 따른 이중배관 진공도의 변화를 분석하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.4
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• pp.874-880
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• 2007

Capillary Suction Time(CST) and Specific Resistance to Filtration(SRF) were commonly used to evaluate the sludge dewatering behaviors. A coupled equation was developed through the mathematical theory which represented both CST and SRF as the physical filterability of the ultrasonically treated sludge. The model for coupling CST and SRF includes both equipment variables and variables related to sludge characteristics, and verified with the results from experiments. The results of the theoretical and experimental study showed that a good correlation relationship among dewaterability indices.

• Journal of the Korea Society of Computer and Information
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• v.13 no.5
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• pp.309-313
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• 2008

This paper examine Citizenship Behavior of Police officer, Empowerment and Customer Orientation in the Police organization, and look for the method of the human resource management to draw behavior of local police. For that, this paper show the base of the basic study for empirical method, this study draws citizenship behavior toward police officer, influence factor of empowerment, and looks for the effective method of the human resource management to draw customer orientation of members

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.389-389
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• 2022

상수도 관망에서의 유량 측정은 유수율을 결정하는 데 있어서 중요한 평가 수단이다. 따라서, 유량 측정을 위해 유량계를 활용하는데, 높은 빈도의 자료를 획득할 수 있는 수압계는 시중에서 저가로 활용 가능하지만, 상수도관망 예산의 상당부분을 차지하고 있는 유량계는 수압계보다 고가에도 낮은 빈도의 자료만을 획득하는 비용 대비 낮은 효율을 가진다. 만약 수압계의 측정자료를 유량자료로 고속전환하는 기술을 개발하면 기존의 유량계보다 적은 비용으로 고빈도의 유량자료를 획득할 수 있다. 상수도 관망에서 수압자료를 유량 자료로 전환하는 기술은 기존 관망에서 유도된 지배방정식에서 임의 관망에서 일련의 유도과정을 거쳐 상하류 단사이 수압과 유량의 관계를 형성하고, 이러한 관계를 활용하여 간단한 저수조-관망-밸브 체제에서 관망 내의 특정지점에서의 시간상 수압자료와 시간상 유량자료의 비를 정의한 다음, 임의의 지점에서 측정된 수압자료를 정의한 비로 나타나는 임피던스 역수를 역푸리에 전환하면 시간상의 유량자료를 획득할 수 있는 원리이다. 이러한 수압-유량 전환기술의 원리를 가지고 개발된 기술의 정확도를 확인하는 과정을 수행하였으며, 이는 전통적 천이류 해석 방법인 특성선 모델로 비교하는 수치해석적인 방법 그리고 실제 설치된 관망을 사용해서 수압을 측정하고, 지정된 지점에서 유량을 정밀측정하여 비교하는 실험적인 방법을 통해 정확도를 비교해봄으로써 개발된 기술을 검증해보고자 한다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.32 no.6
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• pp.906-912
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• 2003

The study was conducted to investigate the effect of Saengshik supplementation on lipid metabolism in rats fed high cholesterol diets. Male Spraque-Dawley rats were administrated 1% cholesterol to induce hypercholesterolemia and were fed on diet containing Saengshik (30%, w/w). Serum and liver lipid profiles and fecal bile acids excretion were examined after 7 weeks of experimental diet. The feeding of diet containing 30% Saengshik significantly decreased total cholesterol (TC) contents in liver and plasma. Since cholesterol was balanced by entero-hepatic circulation through bile acid synthesis and reabsorption, inhibition of bile acid re-uptake in intestine decreases total cholesterol in liver and blood. In this point, significant increament of fecal bile acid excretion in Shaengshik group decreased TC and improved hypercholesterolemia. Also plasma high density lipoprotein-cholesterol (HDL-C) decreasing risk for coronary heart disease in Saengshik supplemented group was significantly higher than control group, whereas low-density lipoprotein-cholesterol (LDL-C) accumulation in arterial vessel wall was significantly lower than control group. In this result, we supposed that supplementation of Saengshik, uncooked natural food, may improve hypercholesterolemia through increment of cholesterol excretion.

• Korean Journal of Plant Resources
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• v.21 no.1
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• pp.5-11
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• 2008

This study examined the characteristics of Pinus thunbergii community that forms a windbreak forest around the coast of Gwanmaedo located in Jodo-myeon, Jindo-gun, Jeollanamdo which is located in the south-western areas of Korea from December 2005 to April 2007 and to suggeste the ecological management methods of coastal windbreak areas. P. thunbergii community, a coastal windbreak forest of Gwanmaedo, was classified into disturbance, growth, mixture, stability, and back mountain vegetation according to major companions species and vegetation types. P. thunbergii community of disturbance and growth vegetation needs active management through tree thinning, mowing, weeding out, use of rest space, and felling sick pine trees. P. thunbergii community of mixture, stability, and back mountain vegetation needs active preservation of a coastal windbreak to restore natural vegetation by making a windbreak walk and a forest buffer zone and inducing vegetation succession. Accordingly, in this study, ecological management methods were suggested according to the actual state of distribution by habitat characteristics of coastal windbreak areas such as management of beaches and surrounding area of idle lands, restoration of back wetlands, inhibition of foreign plants, maintenance of diversity of species and habitats, and prevention of aging and spread of damage from insects.

• Journal of the Korean Society of Hazard Mitigation
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• v.8 no.4
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• pp.61-66
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• 2008

As the water distribution system which is one of the critical lifeline system is deteriorated and pipe failures occur frequently, the more efficient pipe monitoring system becomes a critical issue in the water industry. One of the pipe monitoring systems is called "Smart-pipe System" which is permanent, comprehensive and an automated SIM (Structural Integrity Monitoring) system and has superiorities to existing monitoring system. To implement a smart-pipe system on a water distribution system, assessment of its indirect benefit obtaining from smartpipe such as the ratio of preventing water main failures must be preceded. However, only some researches on this field have been performed. In this paper, the concept of smart-pipe system is compared with the current monitoring systems for a water distribution system, and a method to quantify its benefit using the inconvenient time for customers is suggested. The suggested method was applied to a real water distribution system to estimate its applicability and benefit.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2006.11a
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• pp.243-246
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• 2006

Most of the guided weapons have been kept and transferred at the launching tube and fired in case of necessity in these day. Launching tube is a kind of case to protect the guided weapons from external environments and conducted as a guide when they are fired. When we attached the guided weapons to launching tube we usually has used explosive bolt. Explosive bolts have been used explosives when they had to be separated. But when they are separated there are some bad effects; a flame, fragments and pyre-shock. Because of these bad effects there are many restriction to use bolt as joining devices to precision guided weapons. To solve these problems we invented ball type bolt. Unlike explosive bolt, ball type bolt is separated without a flame, fragments and pyre-shock. And it also has a good mechanical properties as much as those of explosive bolt.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.05a
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• pp.179-182
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• 2008

Most of the guided weapons have been kept and transferred at the launching tube and fired in case of necessity in these day. Launching tube is a kind of case to protect the guided weapons from external environments and conducted as a guide when they are fired. When we attached the guided weapons to launching tube we usually has used explosive bolt. Explosive bolts have been used explosives when they had to be separated. But when they are separated there are some bad effects; a flame, fragments and pyro-shock. Because of these bad effects there are many restriction to use bolt as joining devices to precision guided weapons. To solve these problems we invented ball type bolt. Unlike explosive bolt, ball type bolt is separated without a flame, fragments and pyro-shock. And it also has a good mechanical properties as much as those of explosive bolt.

• The Journal of the Korea Contents Association
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• v.16 no.3
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• pp.116-124
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• 2016

In this paper, we propose digital exhibition contents for the aquarium, especially 'Gyeongpo Lagoon Ecological Museum'. We try to plan appropriate media contents that can be mixed with the aquarium storytelling. The aquarium must have special spaces that are not related with an exhibition directly but are necessary for survival of fishes such as a water circulation room. We design the special spaces using media contents and let visitors feel that the whole aquarium is in the ocean. First of all, we investigate the aquarium currently under construction. And then, we propose the appreciate media platforms and plan individual content. We suggest 3 types of media platforms, 3D water projection, interactive games utilizing Kinect, and a fog screen. Moreover, we produce 2D drawing concepts, 3D modeling images, and virtual exhibitions in virtual reality for the representation of the location in which those platforms are installed and the media contents we plan. The pre-visualization is helpful for the media platform construction and is used as a rough sketch to producing an animation shown in the exhibition.