변속기 케이스에서 발생하는 방사소음 해석 및 저감 설계

정성영(Jeong, Seong-Young),오하영(Oh, Ha-Yeong),박준홍(Park, Jun-Hong),박경진(Park, Gyung-Jin),이현아(Lee, Hyun-Ah),최중선(Choi, Joong-Sun) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.6

This article presents a method to calculate the sound radiation of transmission gearbox housing by using Helmholtz integral. Rayleigh integral is used to verify the method. Half-space radiation is considered because the actual gearbox housing is on hard place like concrete. For optimization, orthogonal array is used as a fractional factorial design method. Sound Radiation is calculated with simple source like plate and sphere shape, then actual gearbox BEM model is applied to the method.

지방상수도 서비스의 생산비용 및 요금에 관한 영향요인 연구

정성영 ( Seong Young Jeong ),조세현 ( Sae Hyen Cho ),현대용 ( Dae Yong Hyun ),배수호 ( Su Ho Bae ) 한국지방행정연구원 2012 地方行政硏究 Vol.26 No.3

본 연구는 지방상수도 서비스의 생산비용 및 요금에 영향을 주는 요인을 실증적으로 분석하는데 목적이 있다. 종속변수는 상수도 생산비용 및 요금이며, 독립변수는 공급적 요인, 수요적 요인, 재정 제도적 요인 등으로 나누어 살펴본다. 실증분석을 위해 156개 지방 상수도사업자를 대상으로 2000년도부터 2009년도까지 10년치 패널 자료를 활용한다. 상수도 생산비용 및 상수도 요금을 경험적으로 추정하는데 두 회귀방정식 간의 잔차항들이 서로 높은 상관관계를 보이기 때문에 분석방법으로 SUR(seemingly unrelated regression) 모형을 활용한다. 분석결과에 따르면, 공급적 요인, 수요적 요인, 재정 제도적 요인들이 두루 상수도 생산비용 및 요금에 유의미한 영향을 미치는 것으로 나타났다. 우선 상수도 생산비용에 부정적 영향을 미치는 변수들은 상수도 시설용량과 인구밀도이었고, 긍정적 영향을 미치는 변수들은 단독주택 비율, 연립주택 비율, 상수도 보급률, 누수율, 상수도 부채 액이었다. 한편상수도 요금에 부정적 영향을 미치는 변수들은 상수도 시설용량, 인구밀도, 재정자립도이었고, 긍정적 영향을 미치는 변수들은 상수도관 길이, 지방자치단체가 일반시인 경우, 상수도 부채 액이었다. The purpose of this paper is to examine factors affecting local water supply costs and water prices in Korea. Our major concerns are in the following: (1) supply-side factors, (2) demand-side factors, and (3) institutional and financial factors. We utilize a seemingly unrelated regression (SUR) estimation method to take into account the correlations between the residuals in the both equations for our dependent variables, i.e., water supply costs and water prices. In doing that, it utilizes panel data (2000 to 2009) from 156 local water suppliers in Korea. According to empirical findings, institutional and financial factors, along with supply-side and demand-side factors, significantly affect local water supply costs and water prices. In details, water supply capacity and population density have negative effects on water supply costs, while water supply rates, water leakage rates, single household rates, multiple household rates, and water supply-related debts have positive effects. Water supply capacity, population density, and local financial autonomy make contributions to a decrease in water prices, while pipe length, a local government categorized as a city rather than a county, and water supply-related debts contribute to an increase in water prices. These findings suggest that we need to consider not only supply-side and demand-side factors but also institutional and financial factors in order to reduce water supply costs and prices.

안산시 다문화정책 거버넌스의 구조 변화 연구

정성영(Seong Young Jeong),공동성(Dong Sung Kong) 한국국정관리학회 2016 현대사회와 행정 Vol.26 No.2

본 연구는 안산시 원곡동에서 형성된 다문화정책 거버넌스 구조가 특정한 맥락과 상황 속에서 어떠한 요인에 의해 변화하는지를 심층적으로 분석하는데 목적이 있다. 다문화정책 거버넌스란 거주외국인 및 다문화와 관련된 공통의 사회문제를 해결하기 위한 의사결정 및 집행 메커니즘을 의미하며, 이를 분석하기 위해서는 거버넌스 참여자 간의 역할과 상호관계를 파악하는 것이 중요하다. 따라서 본 연구는 다문화정책과 관련된 환경과 제도의 변화 및 거버넌스 참여자들의 역할 변화가 급격하게 이루어진 시점을 기준으로 시기를 구분하고, 각 시기별 다문화정책 거버넌스 참여자의 역할과 기능 및 이들이 형성하고 있는 거버넌스의 변화과정을 분석하였다. 안산시는 우리나라의 다문화정책에 있어 가장 상징적인 지역임과 동시에 거버넌스 참여자들과 그들의 역할 측면에서 거버넌스 구조변화 연구의 대표적인 사례라 할 수 있다. 우리나라는 전통적으로 중앙정부 또는 관 주도의 Top-down 방식으로 정책결정과 집행이 이루어지는 경향이 강하다. 하지만 안산시의 경우, 종교단체 및 시민단체가 중심이 된 민간영역이 외국인 문제를 의제화하였고, 이에 대응하여 지방정부와 중앙정부가 참여하여 정책결정과 집행과정에서 적극적인 역할을 수행하는 모습을 보인다. This paper investigates the changes of governance structure associated with multi-cultural policies in the City of Ansan. It defines governance, in a broad sense, as decision-making and implementation mechanisms in order to encompass the main actors and analyse their activities in the policy-making process. The City of Ansan is a pioneer city in South Korea in that the City has been most populous with foreigners and has aggressively embraced multi-cultural policies. The initial governance structure relating to foreigners was loosely formed mainly by some religious and civic groups, and their activities were by nature somewhat sporadic and less institutionalized. But gradually the city got involved and officially initiated public programs which have expanded significantly in a short-time period. And, finally the central government became one the most influential actors by creating its own programs along with financial resources. The case of Ansan City in the field of multi-cultural policy is meaningful since the case is one of the rare cases in the history of Korean governance in that the initial governance was formed in the civilian sector, expanded by involving the local government, and finally the central government: the so-called bottom-up transformation of governance.

물리치료적용에 따른 일부 뇌졸중환자의 우울증 변화

이승주,정성영,Yi, Seung-Ju,Jeong, Seong-Young 대한물리치료학회 2001 대한물리치료학회지 Vol.13 No.1

Objectives: This study was to identify the effect of physical therapy and related factors on depression in stroke patients. Methods: Questionnaires were completed by 46 stroke patients at physical therapy room in Busan Dongeui Medical Center from September 1999 to April 2001. The self·rating depression scale(SDS)was used to assess the differences for depression score in patients who had suffered a stroke. The design of this study was follow-up study between initial physical therapy and one month after initial. Results: A little decreased score(-0.17) was seen in patients treated with physical therapy in difference of depress between initial physical therapy and one month after initial, but there was no significant difference. In gender, male had -0.42 decreased score, female. on the contrary, had +0.09 increased score. Depress score for 50 years group was decreased(-2.08), but below 50 years and above 60 were increased in age (+1.25 and +0.27, respectively). There were no significant difference in weight, educational level, religion, side of paresis, and diabetes. Significant variables related to difference of depress in multiple regression analysis were weight(p=0.0082)and diagnosis(cerebral infarction, hemorrhage)(p=0.0473, R2=0.4241). Conclusions: This study was indicated that the more weight was a higher, the higher difference of depress score was. Difference of hemorrhage patients was smaller than that of infarction patients.

자유무역협정(FTA)이 환경오염산업 교역량에 미치는 영향 분석

김수빈(Sue bean Kim),정성영(Seong Young Jeong),배수호(Su ho Bae) 한국정책분석평가학회 2015 政策分析評價學會報 Vol.25 No.4

Along with today's trend toward globalization and trade liberalization, such crucial issues as global warming and environmental destruction have been under controversial debate in the policy community. This paper aims to empirically examine the effects that Korea-Chile Free Trade Agreement (FTA) and Korea-Singapore FTA have had on inter-country trades in environmental pollution industries. For empirical analysis, it employs an interrupted time series (ITS) analysis method as a quasi-experimental design, which needs to use comparison group(s) in analyzing net effects of FTA policy. Thus, it utilizes a propensity score matching (PSM) method to reduce the potential problem of selection bias. Mexico and Canada were selected as comparison countries for Chile and Singapore, respectively. It uses the monthly data on imports and exports (measured in tons) covering January 2000 to August 2014.According to empirical findings, Korea-Chile FTA had no effects on the inter-country trades in pollution industries either between Korea and Chile or between Korea and Mexico. However, Korea-Singapore FTA significantly contributed to an increase in both exports and imports between the two countries. After Korea-Singapore FTA took effect, the importing amounts from Canada to Korea significantly increased, while the exporting amounts from Korea to Canada did not significantly change. In summary, these findings do not seem to provide conclusive evidence on the relationship between trade and environment. In future, more empirical analyses and case studies should be conducted for better understanding of trade and environment.

전기철도 감전사고 사례와 대책

박종인(Jong-In Park),김완일(Wan-Il Kim),이재봉(Jae-Bong Lee),정성영(Seong-young Jeong),박원찬(Weon-Chan Park),김재문(Jae-moon Kim),박철민(Chul-Min Park) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.7

교류 25㎸전차선로 흡상전류비 방식 고장점 표정 기초 연구 및 사례 분석

박종인(Jong-In Park),이동호(Dong-Ho Lee),정성영(Seong-young Jeong),박원찬(Weon-Chan Park),김완일(Wan-il Kim),김재문(Jae-moon Kim) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.10

지진발생 시 직류전기철도 전철주의 안정성 고찰

박원찬(Weon-Chan Park),김완일(Wan-Il Kim),이재봉(Jae-Bong Lee),정성영(Seong-young Jeong),김재문(Jae-moon Kim) 대한전기학회 2016 대한전기학회 학술대회 논문집 Vol.2016 No.10

뇌졸중환자의 물리치료 적용에 따른 인지기능변화와 관련요인

이동형,이승주,강점덕,이태식,이승동,정성영 대한물리치료학회 2000 대한물리치료학회지 Vol.12 No.3

Objectives : The aim of this study was to analyze the effect of physical therapy and related factors on cognitive function in stroke patients. Methods : Questionnaires were completed by 36 stroke patients at physical therapy room in Dongeui Medical Center from September 1999 to September 2000. The Mini-Mental State Examination-Korea(MMSE-K) was used to assess the differences for cognitive function in patients who had suffered a stroke. Results : There were severe 16.7%, mild 16.6%, and normal 66.7% in distributions for cognitive function, respectively. In the difference of cognitive function score for at initial, 25.64 for smokers had significantly higher than 20.36 for nonsmokers(p$lt;0.05). Also, 26.21 for smokers had higher than 21.27 for nonsmokers after a month(p$lt;0.05). However, no significant dilierence existed in comparison at initial with after a month. 25.0 for patients without coma was higher than 9.50 for with(p$lt;0.05), 25.80 for patients without was also higher than 10.16 for with in after a month. There were no statistically significant variables related to difference for cognitive performance in multiple regression analysis. Conclusions: Results indicated that smoker and patients without coma at onset had high cognitive functions.