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.

연마필름을 이용한 효율적인 수퍼피니싱 조건의 결정에 관한 실험적 연구

정성용(Sung Yong Jung),박기범(Ki Beom Park),정윤교(Yoon Gyo Jung),정수룡(Soo Yong Jung) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.8

Recently, many studies are being conducted to realize high quality polishing technology, but because of high dependence on field experience and insufficient research for ultra-precision polishing technology, it is difficult to establish standardization of polishing conditions. The purpose of this study is to determine high-efficiency superfinishing conditions which are applicable in the field of machining. To achieve this, we have a developed a superfinishing device and conducted a series of polishing experiments for mechanical materials such as SM45C, Brass, Al7075, and Ti, from the perspective of oscillation speed, the rotational speed of the workpiece, contact roller hardness, contact pressure, and feed rate. From the experimental results, it was confirmed that the polishable superfinishing conditions range and efficient feed rate of polishing film can be etermined.

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

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.

카오스 이론을 이용한 암호화 기법

정성용(Jung sung-yang),김태식(Kim Tae-sik) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ

본 연구에서는 로버트 메이의 논리차이방정식(Logistic difference equation)을 이용하여 ASCII 코드로 만들어진 문서를 암호화 할 수 있도록 하는 카오스 LCC(Logistic Chaos Cryptosystem)을 제안한다. 카오스를 이용한 암호화 기법은 기존이 암호화 기법으로 알려진 DES(Data Encrypion Standard)나 RSA(Rivest, Shamir, Adleman)등과는 비교되는 기법으로 초기 조건에 민감한 카오스이 특징을 이용하였다. 실험결과 제안된 LCC 기법을 통해 암호문은 카오스적으로 표현되었으며, 원문과 사이에 어떠한 관련성도 찾아 볼 수 없었다. 향후 안전성이나 처리속도에 대한 검증과 표준화 문제 및 멀티미디어 자료 등에 대한 암호화 기법을 계속 연구해야 할 것이다.

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.

[가솔린엔진부문] 냉시동시 배기 저감을 위한 시동 배기가스 점화 기술에 관한 연구

정성용(Sung-Yong Jung),송대근(Dae-Keun Song),조용석(Yong-Seok Cho),김득상(Duk-Sang Kim),이윤석(Yoon-Seok Lee) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1

In order to reduce the exhaust emissions from gasoline-powered vehicles, the Cranking Exhaust Gas Ignition (CEGI) technology, which reduces catalyst warmup time, was developed in this study. The CEGI technology enables catalysts to reach the light-off temperature (LOT) within several seconds after engine cracking by burning fuel-air mixture in the exhaust pipe using glow plugs. Results from an experimental study showed that the catalyst reached the LOT in a sufficiently short period of time when the operation time of CEGI exceeds 4 seconds. The optimal operating time of CEGI technology, a hydrocarbon adsorber was applied to the catalytic converter, to reduce the first peak of the HC emission during the cranking period. Experimental results show that CO and THC emissions during the first 300 seconds of cold start are reduced by 97.3% and 59.1% respectively.

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.

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.