• Journal of Periodontal and Implant Science
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• 제32권4호
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• pp.745-752
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• 2002

Osteomyelitis is an exhaustive disease whose main feature is an inflammation of inner part of bone, bone marrow. In oral and maxillofacial area, we have maxillary and mandibular osteomyelitis and the latter is dominant because of its impaired blood supply. The main cause of osteomyelitis is a bacterial infection and the ways of infections are by periapical odontogenic infection, fracture, post-operative complication, and periodontal disease. The predominant etiologic factor is periapical odontogenic infection mostly caused by advanced dental caries. It is generally believed that periodontal disease could be a cause of osteomyelitis. But periodontal disease is usually confined to the alveolar bone area and not extends to the underlying bone marrow. Accordingly periodontal infection per se rarely cause produce oseomyelitis. Even though osteomyeltis could be occurred by periodontal disease, its virulence of infection is milder than periapical odontogenic infection. So it usually provokes sclerosing or hyperplastic osteomyelitis rather than suppurative type. We had a case of suppurative osteomyelitis caused by periodontal disease and treated it with periodontal and oral and maxillofacial surgical method.

• 한국해양학회지
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• 제25권3호
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• pp.131-134
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• 1990

일정한 기간동 한 해역에서 연속적으로 어류플랑크톤 재료를 수집하여 분석함 으로써, 그 시기에 존재하는 어류플랑크톤의 사망률을 추정할 수 있다. 이때 대상 어 종의 자치어군은 조사 해역내에 모두 존재하며, 다른 곳으로 이동되지 않았음을 전제 로 한다. 그러나 해양환경은 대단히 역동적이 기 때문에 플랑크톤들은 한 해역에만 계 속해서 머물러 있지 못하고, 시간이 지남에 따라 그 분포범위가 넓어진다. 본 연구는 kim and Bang(1990)에서 제시된 해양확산계내 자치어의 사망을 추정해에 대한 내용을 보충 설명하기 위해서 준비되었다.

• 대한안전경영과학회지
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• 제8권1호
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• pp.113-130
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• 2006

As environmental damage increase by a highly developed material civilization of today, many companies take a growing immensely interest in the influence of environment for beginning a new paradigm year by year. The previous assessments dose not run the gamut of industry but is confined within a certain facility or an area. Industrial processes and operations can not be accomplished independently but are connected with each others through suppliers and customer, and these ideas are fundamental notions of Life Cycle Assessment(LCA). This paper will introduce Life Cycle Assessment(LCA) in environment which is rising, and would like to build environmental management system using approach of Quality Function Deployment(QFD) and Safety Function Deployment(SFD) belonging to the assessment method.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2004년도 추계학술대회
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• pp.39-46
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• 2004

As environmental damage increase by a highly developed material civilization of today, many companies take a growing immensely interest in the influence of environment for beginning a new paradigm year by year. The previous assessments dose not run the gamut of industry but is confined within a certain facility or an area. Industrial processes and operations can not be accomplished independently but are connected with each others through suppliers and customer, and these ideas are fundamental notions of Life Cycle Assessment(LCA). This paper will introduce Life Cycle Assessment(LCA) n environment which is rising, and would like to build environmental management system using approach of Quality Function Development(QFD) and Safety Function Development(SFD) belonging to the assessment method.

• Journal of the Optical Society of Korea
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• 제20권5호
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• pp.628-632
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• 2016

We studied experimentally and theoretically the vertical range of the confined electric field in the gap area of metamaterials, which was analyzed for various gap widths using terahertz time-domain spectroscopy. We measured the resonant frequency as a function of the thickness of poly(methyl methacrylate) in the range 0 to 3.2 μm to quantify the effective detection volumes. We found that the effective vertical range of the metamaterial is determined by the size of the gap width. The vertical range was found to decrease as the gap width of the metamaterial decreases, whereas the sensitivity is enhanced as the gap width decreases due to the highly concentrated electric field. Our experimental findings are in good agreement with the finite-difference time-domain simulation results. Finally, a numerical expression was obtained for the vertical range as a function of the gap width. This expression is expected to be very useful for optimizing the sensing efficiency.

• 한국자동차공학회논문집
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• 제11권5호
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• pp.176-182
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• 2003

The researches for autonomous vehicle have been implemented in many studies, but most studies were confined to the lane fol1owing and changing. This paper addresses a problem of autonomous lane following parking a nonholonomic vehicle. The algorithm for image processing by the hough transform and controlling a steering angle and speed to park a nonholonomic vehicle is developed. The developed system which integrated the control algorithm for parking and vision algorithm for line traction tested with RC car and verified by the performance of the detection of parking area and the reactive parking without collisions.

• 한국태양에너지학회 논문집
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• 제33권3호
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• pp.1-8
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• 2013

In order to identify positive or negative effect of seawall on wind turbine, a wind tunnel experiment has been conducted with a 1/100 scaled-down model of Goonsan wind farm which is located in West coast along seawall. Wind speedup due to the slope of seawall contributed to about 3% increment of area-averaged wind speed on rotor-plane of a wind turbine which is anticipated to augment wind power generation. From the turbulence measurement and flow visualization, it was confirmed that there would be no negative effect due to flow separation because its influence is confined below wind turbine blades' sweeping height.

• 한국건설관리학회논문집
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• 제7권1호
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• pp.89-99
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• 2006

최근의 주택 개발사업은, 주택시장의 분위기가 사업의 중요 요인 중 하나였던 예전의 상황과 달리, 투자자금의 모집과 사업부지 물색 등의 어려움으로 타당성 분석의 정밀도가 점차 중요시 되고 있다. 주택 개발사업의 타당성 분석에 있어 토지의 이용 가치와 관련된 용적률, 상품수준에 관련된 분양비, 또한 금융비용에 영향을 미치는 공사기간은 중요한 요소이며, 본 연구에서는 이러한 용적률 분양비 공사기간을 개별 프로젝트의 고유특성인 계획특성으로 채택하였다. 따라서 본 연구는 타당성 분석의 체계적인 접근을 위하여 용적률, 분양비, 공사기간을 계획특성인자로 채택하여 타당성 분석 시 공동주택의 계획 특성이 분양원가에 미치는 영향을 회귀분석을 이용하여 분석하였다.

• 한국안전학회지
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• 제14권3호
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• pp.40-47
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• 1999

A numerical study on gaseous explosion was carried out to predict the transient pressure behavior with the partial rupture in confined vessels. Equations, assumptions and solutions for central ignition of premixed gases in closed spherical vessels are proposed with various equivalence ratios of gas fuel, as $CH_4$ and $C_3H_8$, vent areas and vent opening pressures. Given vent opening pressure in a vessel, the magnitude of second peak pressure results from the vent areas and burning velocity, varied by equivalence ratio of gas fuel. In a living room of an apartment, the higher second peak pressure than the vent pressure is not appeared due to its large window areas. As vent opening pressure is higher, the larger damage by gaseous explosion is expected and the larger vent area is necessary for relieving the damage. In the same concentration, the gaseous explosion by propane rather than methane shows the larger damage due to its higher adiabatic flame temperature and equivalence ratio.

• Asian-Australasian Journal of Animal Sciences
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• 제14권8호
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• pp.1085-1089
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• 2001

Metabolites, such as isopropyl alcohol (IPA) produced by rumen fermentation, were intravenously infused into a jugular vein of goats during feeding to explore the mechanism and roles of IPA in ruminating behavior (number of boli and ruminating time). Three female goats were confined in metabolism cages with a stanchion, The ruminating behavior measured by the number of ruminations, ruminating time, number of remastications, and remasticating time decreased (p<0,05) with intravenous IPA infusion. The IPA concentrations and VFA concentrations increased in the blood circulation. Our data suggest that sensitive receptors of rumination to IPA are more likely to be in an area such as the brain stem where they can respond to blood metabolite levels.