지각과민치아에 대한 Nd:YAG 레이저 조사의 효과

정성용,김경희,고명연,안용우,박준상,Jung, Sung-Yong,Kim, Kyoung-Hee,Ko, Myong-Yun,Ahn, Yong-Woo,Park, Jun-Sang 대한안면통증구강내과학회 2005 Journal of Oral Medicine and Pain Vol.30 No.4

The purpose of this study was to evaluate the desensitizing effects of a Nd:YAG laser (Sunlase, SUNRISE Technologies, Inc., USA) irradiation on cervically exposed hypersensitive dentine. 45 patients was irradiated with pulsed Nd:YAG laser (1.5 W, 20 Hz, 75 mJ/pulse, 4 minutes) as the experimental group, 27 patients was mock irradiated as the control group. The degree of sensitivity to the thermal and tactile stimuli were determined qualitatively with an evaporative stimulus defined as two times air blast at a distance of 3 mm from each site to be tested and with a mechanical stimulus as a slightly scratching the cervical site with a dental explorer. A qualitative registration of the degree of discomfort was determined according to a numerical pain scale(NPS) in an 11-point scale in which 0= "no pain" and 10="most excruciating pain imaginable". Recordings were assessed before treatment, immediately after, 1 and 2 weeks after treatment. Pain tolerance threshold and pulp vitality were evaluated with electric pulp tester before and immediately after treatment. 1. Desensitizing of hypersensitive dentine with Nd:YAG laser irradiation was more effective than that with mock irradiation. 2. The placebo effect of mock irradiation was recognized for severe sensitive teeth($NPS\;{\geqq}\;6$), but not for moderate sensitive teeth(NPS < 6). 3. Laser irradiation did not affect the pain tolerance threshold and pulp vitality of the hypersensitive teeth. 4. Desensitizing effect of laser irradiation for the hypersensitive teeth had been continuing at least 2 weeks. It was concluded that desensitizing of hypersensitive dentine with a Nd:YAG laser is effective and the maintenance of the positive result was more prolonged than the placebo effect.

광통신용 파장 대역에서 동작하는 체적 홀로그래픽 필터

정성용(Sung-Yong Jung),양병춘(Byungchoon Yang),이병호(Byoungho Lee) 대한전기학회 1998 대한전기학회 학술대회 논문집 Vol.1998 No.11

집/배송 터미널(연계거점) 입지선정을 위한 MADM 분석 기반 최적의사결정 방법론

정성용(Sung Yong Jung),김승모(Seung Mo Kim) 한국SCM학회 2015 한국SCM학회지 Vol.15 No.1

Most of the studies on selection of a parcel terminal location have taken direct cost variables into consideration to design a model and to suggest a methodology for solution. But, this study utilized TOPSIS (Technique for Order Preference by Similarity to ideal Solution) as a analysis tool of Multi-Attribute Decision Making, to reflect several additional environment variables such as volume ratio, land cost, accessibility to express highways and a level of traffic congestion for the purpose of quantitative evaluation on a level of candidate parcel terminals, and their order of priority was drawn. In this study, an optimal decision-making methodology for selection of a parcel terminal location is suggested, according to Goal Programming which is a multi-purpose optimization technique, so as to maximize a level of a candidate location as well as to minimize logistics costs. This methodology was based on SSCFLP as one of optimization models for location selection to make it possible to apply for evaluated candidate result values.

유전자 알고리즘을 이용한 강의실 배치문제

정성용(Jung sung-yong),김태식(Kim Tae-sik) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.1B

유전자 알고리즘(Genetic Algorithms)은 전형적인 Combinatorial Optimization 문제에 적용되는 최적해 탐색 알고리즘이다. 본 연구에서는 유전자 알고리즘을 이용하여 다양한 매개변수로 인해 최적의 값을 쉽게 얻을 수 없는 대학의 강의실 배치문제를 해결하고자 하였다. 본 연구에서는 강의실, 강의실의 수용학생수, 개설강좌수, 개설강좌당 수강신청인원등 4개의 매개변수를 이용하여, 강의실에 개설가능한 강좌의 유형을 정하고, 각 강좌별로 수강신청한 학생의 수가 강의실의 최대 수용인원을 넘지 않도록 하는 조건에서 약 88.9%의 만족도를 얻었다.

원형 및 사각형 단면 형상을 가진 tandem 실린더의 gap flow 유동현상 규명에 관한 연구

정성용(Sung Yong Jung),박한욱(Hanwook Park) 한국가시화정보학회 2020 한국가시화정보학회지 Vol.18 No.2

Problems related with flows around structures are typical in various engineering fields. The characteristics of these flow structures depend strongly on the shape of the body. The flow regime around square cylinders which are also employed in various applications has also been investigated. In addition to a single body, flows past closely spaced structures arranged in tandem are observed in numerous practical applications. In this study, the flow characteristics around the circular and the square cylinder were investigated according to S/D. The velocity fields and Reynolds stress of the single cylinders were acquired to explain the flow behaviors between tandem cylinders. The differences observed in the flow behaviors of square and circular cylinders were studied. The flow patterns around two tandem cylinders can be classified into three types of wake interference behaviors according to S/D. This is related with the flows between cylinders.

COSYSMO를 이용한 SUAV 체계에 대한 SE 비용추정에 관한 연구

정성용(Sung Yong Jung),박인경(In Kyoung Park) 한국경영과학회 2008 한국경영과학회 학술대회논문집 Vol.- No.-

Organization wishes to develop newer and more complex system according as social structure is more complex and a technology develops more. Therefore, field of system engineering in development of new system is realized by all-important essential boundary. However cost of SE have considered restrictively being not about SE cost having applied SE. About this problem, this study provides COSYSMO as model for SE cost estimation, as the application example, estimate SE cost for smart UAV system applying COSYSMO in PRICE Trueplanner.

도시교통 혼잡비용과 대기오염의 적정수준 결정에 관한 연구

정성용(Jung Sung Yong),김운수(Kim Woon Soo) 한국지역개발학회 1995 韓國地域開發學會誌 Vol.7 No.2

Today, most CBD areas in major cities suffer from traffic congestion, which not only causes higher travel time, but also results in worsened air pollution. Motor vehicles are the greatest single contributors to urban air pollution due to the sheer volume of their emissions per mile driven. The basic objective of this research is to develop a methodology through which both transportation network performance and urban air quality can be substantially improved. We present a mathematical programming model(Nonlinear Static Programming Model : NLSPM) that jointly minimizes transportation costs and automobile pollution impacts, using both the user-optimum and the system-optimum approach. The combined model must also properly deal with the interactions between travel time, traffic flow and speed, link capacity investment decisions, vehicle emission/diffusion, and the resulting air pollution concentrations. Based on the numerical analysis of the combined model for different Origin-Destination demands and meteorological conditions over a hypothetical network, we then figure out the social optimum level of traffic congestion and air pollution concentrations in the transpotration network.

영문논문 : 통계적 시뮬레이션을 통하여 도출된 로짙모형 파라메타 최우추정치의 소표본적 특성

정성용(Jung Sung Yong) 한국지역개발학회 1998 韓國地域開發學會誌 Vol.10 No.2

본 연구에서는 로짓모형의 확률변수에 대한 가정이 충족되지 않은 경우의 수단더미 상수의 최우추정치의 성질을 통계적 모의분석 기법을 이용하여 도출해 보고자 하였다. 모의분석 결과에 의하면, 확률변수 분포가 로짓모형의 가정과 일치하는 경우에는 수단더미 상수를 포함하는 모형이 수단더미상수를 포함하지 않는 모형에 비해 약간 우수하나 수단상수 추정치의 편차는 여전히 심하게 발생하는 것으로 분석되었다. 이 경우에도 수단더미 상수를 포함하지 않는 축약모형의 파라메타의 최우추정치는 편향된 추정치가 아님이 밝혀졌다. 확률변수 분포가 로짓모형의 가정으로부터 위배되었을 경우에는, 수단더미상수의 최우추정치는 매우 편향된 값을 갖게 되므로 수단상수를 포함하는 모형은 수단상수를 포함하지 않는 축약모형에 비해 모형의 평균 제곱오차 값이 크게 나타났다. 본 연구의 모의분석을 통하여 얻는 경험적 지식에 의하면, 수단상수가 모형 전체의 설명력에 차지하는 비중이 높거나 확률변수에 대한 가정이 잘못되었다고 판단되는 경우에는 수단더미상수를 포함하지 않는 축약모형을 이용하는 것이 더욱 바람직하다.

미분양주택 조세감면이 개별수요에 미치는 이질적 효과

정성용(Jung, Sung Yong) 한국지적학회 2014 한국지적학회지 Vol.30 No.2

금융위기이후 누적되는 미분양아파트 해소를 위해, 이명박정부 및 박근혜정부는 취득세, 양도소득세 등과 같은 다양한 조세감면정책을 시행하였다. 대부분의 선행연구에서는 시계열 자료를 거시경제모형에 적용하여 미분양아파트 조세감정책의 장기적 효과를 평가하고 있다. 거시경제모형은 부동산 정책의 장기적 정책효과 측정에는 유효하나, 단기적, 분배적 효과와 같은 미시적 효과 측정에는 부적절하다. 따라서, 본 연구에서는 소비자의 사회ㆍ경제적 특성에 따른 부동산 조세감면정책의 이질적 파급효과를 측정하기 위한, 시장분할법 및 확장모형을 적용한 개별수요모형을 구축하였다. 본 연구의 실증분석결과에 의하면, 미분양아파트 해소를 위한 조세감면정책은 소비자의 경제적 특성인 소득이나 자산규모에 따라 상이한 영향을 미치는 것으로 규명되었다. 확장모형의 의한 실증분석결과에 의하면, 미분양아파트 개별수요에 영향을 미치는 조세관련변수는 고정계수가 아니라 소비자의 사회ㆍ경제적 특성변수와 상호작용하는 가변계수로 규명되었다. To resolve the unsold housing accumulation. problem after the financial crisis in 2007, Lee Myung-bak. and Park Geun-hye government implemented various real estate tax reduction policies. In the most previous studies, the effect of tax reduction policies are evaluated by the macro-economic model using aggregated time-seris data such as Grangeur, VAR and VECM. However, it is impossible to evaluate the distributional impact of the policy over population. using macro-economic model. The policies are never evaluated in rhe previous studies in terms of how the policy influenced the indvidual's demand changes in the real estate market. Thus, various individual demand models, which is possible to explain the distribution effect of the tax reduction policy, are constructed in this study. According to the empirical result of this study, the tax reduction policies for the unsold housing have no longer homogeneous impacts over population. The result of the probit model using the expansion method shows that the parameter of tax-related variables such as acquisition tax and capital gain tax are not fixed parameters but variable parameters.

부동산 거래비용이 매도자의 거래의사에 미치는 영향 -진술선호모형의 실험적 분석결과를 중심으로

정성용 ( Sung Yong Jung ) 韓國不動産分析學會 2009 不動産學硏究 Vol.15 No.2

The real estate tax policies have been repeatedly changed as a means of stimulating or deterring the domestic economic conditions in korea. Those frequently changed tax policies of real estates on transactions have made korean nationals distrust of tax policies of real estate in the local market and that resulted in the price turbulence. It is desirable to implement a consistent tax policy of real estate, which is designed to meet the long-term policy goals like obtaining of stabilities of the real estate market. Analyzing both positive and negative effects imposed by the tax policies on the real estate market is important to suggest the right tax policy to achieve stabilities of real estate market through the tax policies. The purpose of this study is to develop a model which can explain sellers` reactions against tax policy changes of real estate market. A real estate transaction model which is consisted of the transaction cost theory and the individual choice model is introduced in this study. The model is expected to explain how each individual seller`s willingness to sell is influenced by changes of real estate tax policies. The result of this experimental study using the stated preference approach confirms theoretical results of the transaction cost theory and so does results of prior studies on housing and land-use. The transaction cost which incurs in the process of the real estate transaction such as registlation taxes, acquisition taxes and capital gains taxes affect negative influences on the seller`s willingness to sell. The heavy burden of taxation on the capital gain may freeze trading activities in the local real estate market. And eventually, that freeze on transactions in real estate may cause negative impacts of real estate resources distributions in the nation.