LNT 촉매에서 환원제 분사 조건에 따른 De-NO<SUB>x</SUB> 특성에 관한 실험적 연구

모지환(Ji-Hwan Mo),박영준(Young-Joon Park),송춘섭(Chun-Sub Song),윤여빈(Yu-Bin Yoon),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

LNT(Lean NOx Trap) catalyst is an aftertreatment system typically used to reduce oxides of nitrogen(NOx) emissions for diesel engine. During the lean condition of exhaust gas, NOx is stored in the LNT catalyst and released and reduced during the rich condition of exhaust gas. In generally, rich condition of exhaust gas is made by post fuel injection or injection of the reductant such as CO₂, HC. The most effective method for de-NOx performance is an optimum injection rate of reductant as a function of exhaust gas condition. Injection rate of reductant made by diesel fuel has effected on the fuel economy and NOx reduction efficiency. This paper aimed to figure out evaluate to effect of exhaust gas temperature, O₂ concentration in exhaust gas and mass of reductant injection for de-NOx peformance of LNT catalyst using the test rig. Space velocity is held 30,000 h?¹ that is generally measured high reduction performance in catalyst. In result, NOx conversion efficiency is the highest when the specification temperature of exhaust gas and reduced NOx concentration in exhaust gas as injection rate of reductant increases. O₂ concentration in exhaust gas is 4%, NOx reduction efficiency is higher than 10% of O₂ concentration in exhaust.

환경오염에 대한 인식, 이웃관계, 신체적, 정신적 건강이 노화불안에 미치는 영향: 한국인과 일본인을 중심으로

모지환 ( Mo Jee Hwan ),이중섭 ( Lee Jung Seb ) 한국보건사회연구원 2016 保健社會硏究 Vol.36 No.2

This research utilized a structural equation model to analyze the data with cases of Korea and Japan so that it could search whether it mediates both the physical mental health state and the residential environment have an effect on any kinds of path to the aging anxiety. The results are summarized as follows. Firstly, the residential environments in Korea and Japan differences in their effect on concerns about aging. Physical residential environment and social residential environment were found to affect the direct influence in the case of Korea to anxiety about aging. However, physical residential environment affected the direct influence in the case of Japan to the aging anxiety. Secondly, in both Korea and Japan, residential environment showed differences in the path of an effect on anxiety about aging. Whereas social residential environment among the residential environment have an effect on the aging anxiety by mediating the physical mental health state in the case of Korea, the physical residential environment was exposed to reach the meaningful influence the aging anxiety by mediating the physical mental health state in the case of Japan. Thirdly, except that it was rejected in the path between residential environment and the aging anxiety injecting the demographic variable which the family took care, includes the yes or no as a control variable after a control variable input that social residential environment affected the meaningful influence to the aging anxiety. It was similar with the path of the causal sequence of the control variable input before. The institutional measure relieving the aging anxiety was suggested based upon this analyzed result.

HC trap 성능 예측을 위한 실험적 연구

모지환(Ji-Hwan Mo),박영준(Young-Joon Park),윤여빈(Yu-Bin Yoon),이성욱(Seang-Wock Lee),조용석(Yong-Seok Cho) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4

In an air induction system while vehicle is parked, evaporative emissions from the fuel in the intake port and injector nozzles diffuse to atmosphere through the air cleaner. In order to reduce the evaporative emissions, the HC trap which is composed an activated carbon is installed in the air cleaner box. This paper aimed to make a numerical model for evaluating absorbing performance of hydrocarbon in the HC trap. In order to make the model, a test rig is made for measuring the deviation of hydrocarbon concentration through the HC trap. Using the results, the mass of loaded HC in the HC trap is calculated.

노인빈곤 영향요인에 관한 다층분석

모지환(Mo, Jee-Hwan),함철호(Ham, Cheol-Ho) 한국사회조사연구소 2009 사회연구 Vol.- No.18

이 연구는 한국복지패널 제1차년도(2006년) 자료를 통해 노인과 노인가구를 대상으로 빈곤 영향요인을 탐색하는 다층모형(multi-level) 분석을 시도하였다. 분석 결과 개인수준에서는 배우자 유무, 경제활동 유무를 제외한 성별, 건강상태, 순재산 규모, 교육연수가, 집단수준에서는 지역이 노인의 빈곤에 영향을 미치는 요인으로 나타났다. 이러한 연구결과는 생애주기별 고용의 질을 확보하는 대책, 기본소득(basic income) 제도의 도입, 지역적으로 차별화된 노인빈곤대책 모색의 필요성을 시사한다. The purpose of this study is to explore factors influencing the poverty of the elderly in Korea. For this, we use the panel data from first wave(2006) data from Korea Welfare Panel Study (KoWePS). The data is analyzed by adopting a Multi-level Model, which is known as an appropriate data analysis method for hierarchically structured data, to look at the factors that affect on the poverty of the elderly poor. The results of this study are as follows: on the individual level, sex, health status, scale of net property, and years of education are shown to be significant predictors for the poverty of the elderly; on the group level, region of residence is shown to be a significant predictor in determining their poverty status. Such results suggest that policies on the quality of life-time career, basic income, and regionally specialized systems are needed.

사회복지사의 재교육이 소진에 미치는 영향

모지환(Mo, Jee Hwan),최정민(Choi, Jeong Min),장신재(Jang, Shin Jae) 한국사회복지행정학회 2011 한국사회복지행정학 Vol.13 No.2

관료적 조직풍토가 조직몰입에 미치는 영향

모지환(Mo, Jee-Hwan),이중섭(Lee, Jung-Seb),문영주(Moon, Young-Joo) 한국지역사회복지학회 2011 한국지역사회복지학 Vol.0 No.38

본 연구는 지방자치단체 사회복지직 공무원 217명을 대상으로 공공 사회복지조직의 관료적 조직풍토와 공직 비윤리 행동, 직무만족, 그리고 조직몰입 간의 인과적 관계를 경험적으로 논증하였고, 그 결과를 요약하면 다음과 같다. 첫째, 관료적 조직풍토는 공직 비윤리 행동에 정적 영향을 미치는 것으로 나타나, 사회복지조직의 조직풍토가 관료적일수록 조직내 사회복지공무원의 행동양식도 비윤리적임을 알 수 있었다. 둘째, 공직의 비윤리적 행동이 직무만족이나 조직몰입 등의 조직효과성에는 유의미한 영향을 미치지 않는 것으로 나타났고, 이 같은 윤리적 혹은 비윤리적 행동과 직무만족간의 인과론적 관계에 대한 논증은 대상 집단의 업무특성에 따라 상이한 결과가 도출될 수 있다는 점에 유의할 필요가 있음을 보여준다. 셋째, 관료적 조직풍토는 조직몰입에 직접적인 영향을 미침과 동시에 직무만족을 통하여 간접적인 영향을 미치는 것으로 나타났다. 즉, 사회복지조직의 관료적 풍토가 강할수록 사회복지직 공무원의 직무만족과 조직몰입은 낮아지며, 사회복지직 공무원의 낮은 직무만족은 조직몰입의 수준도 낮추는 것으로 나타났다. 이 같은 결과를 토대로 본 연구는 권위적이고 관료적인 조직풍토의 개선과 사회복지행정의 업무특성을 반영한 전문적인 전달체계로의 개편을 제안하였다. This study empirically proved causality among Bureaucratic organizational climate, administrative unethics, job satisfaction, and organizational commitment in the public social welfare organization by using the data from 217 public officials. Summarizing the results, they are as follows. First, the bureaucratic organizational climate had positive influence on the public officials’ unethical behaviors in service. That is, the more bureaucratic in the organizational climate of social welfare organization was indicated to lead to being the more unethical even in the behavioral way of the public officials within organization. Second, the unethical behaviors in the public service were not significantly related to the job satisfaction and organizational commitment. It shows a need of paying attention to a point that the demonstration on causality between this ethical or unethical behavior and job satisfaction may be elicited different results depending on public officials’ task characteristics. Third, the bureaucratic organizational climate was indicated to not only have a direct influence upon organizational commitment but also have an indirect influence through job satisfaction. In other words, the stronger bureaucratic climate of social welfare organization leads to the lower job satisfaction and organizational commitment in public officials and that their low job satisfaction leads to lowering even the organizational commitment. Based on these results, this study suggests reorganization into the professional delivery system that improves authoritative and bureaucratic organizational climate and reflects task characteristics of social welfare administration.

자살행동 영향 요인: 성별, 연령별 집단 비교를 중심으로

모지환 ( Mo Jee Hwan ),배진희 ( Bae Jin Hee ) 한국보건사회연구원 2011 保健社會硏究 Vol.31 No.2

The purpose of this study is to identify factors that predict suicidal behavior and further examines whether there is gender and age difference. For the study, the Korean General Social Survey(KGSS, 2009) data was analyzed. Sample consists of 1,599 individuals aged 18 and over. Multiple regression was used for data analyses with SPSS 15.0 version. The results shows that (1) stress, depression and living alone were significant variables of suicidal behavior for men between aged of 18 to 59, (2) stress, depression suicidal attitude, economic status and health status were significant variables of suicidal behavior for women between aged of 18 to 59, (3) stress, depression and conception of social conflict were significant variables of suicidal behavior for men aged 60 and over, and (4) depression, suicide survival and suicidal attitude were significant variables of suicidal behavior for women aged 60 and over. Based on these findings, implications were discussed for preventing suicide.

한국인의 복지인식 결정요인에 관한 연구

모지환 ( Jee Hwan Mo ),김행열 ( Haeng Yeol Kim ) 조선대학교 동북아연구소 2009 동북아연구 Vol.24 No.1

The purpose of this study is to explore the determinants of Korean welfare attitudes. For this, panel data from 2nd wave(2007) data from Korea Welfare Panel Study (KoWePS), is used. The results show that negative evaluation of government`s social policy, economic status and welfare experiences affect on aspects of the welfare attitude investigated in this study. It can be said that the basis to demand welfare expansion exist in Korea. However It is impossible to construct developmental welfare state because of the weak reliability of government`s social policy. Considering the motive and the budget limit of welfare state, Korean welfare development should be headed for the universal welfare state instead of welfare for the poor, as public welfare experiences make people in all classes support public welfare.

청소년의 애착과 자기통제가 심리적인 부적응에 미치는 영향

모지환(Mo, Jee-Hwan),김연화(Kim, Yeon-Hwa),유제민(Yoo, Jae-Min) 한국사회조사연구소 2010 사회연구 Vol.- No.20

이 연구의 목적은 청소년들을 대상으로 애착과 부적응적 심리상태와의 관계에서 성과 자기통제의 역할을 검증하는 데 있다. 이 연구의 대상자는 한국청소년패널조사(KYPS)의 중2 패널 5차년도 자료에서 중학교 3학년으로 구성된 2,870명(남자는 1,470명, 여자는 1,400명)이다. 이 연구 결과, 애착과 자기통제는 청소년들의 심리적 부적응에 중요한 영향을 끼치고 있음을 확인하였다. 특히 성과 자기통제의 역할 검증에서 여자 청소년의 경우에는 자기통제가 애착과 부적응적 심리상태를 매개하는 것으로 나타났으나 남자 청소년의 경우에는 효과가 없는 것으로 나타나 성이 애착과 심리적인 부적응 사이에 중재효과를 보였고 자기통제는 매개효과가 있는 것으로 확인되었다. 이런 결과는 청소년의 자기통제에 영향을 미치는 애착과 부적응적 심리상태를 고려할 때, 성별에 따른 개입프로그램이나 전략을 세우는 데 도움이 될 수 있을 것이다. 그러나 이 연구의 한계점도 찾을 수 있다. 최근 아버지와의 애착이 주는 효과가 다수 연구되고 있는 점을 감안할 때, 차후 연구에서는 청소년의 애착에 영향을 미치는 부모변인을 각각 따로 비교하여 살펴보는 연구가 필요하며 부적응적 심리상태로 측정된 우울과 불안변인 또한 독립적인 차원으로 구분하여 연구될 필요가 있다. The purpose of this study is to examine about how gender and self-control influence the relationship between attachment and psychological well-being among Korean adolescents. A sample of 2,870 adolescents (in the 3rd grade of middle school, 51% boys), who responded to the wave 5 survey as second panel participants of Korean Youth Panel Study (KYPS) was used to test hypotheses. Results supported the hypothesis that self-control mediates the relations of attachments to psychological well-being. However, gender moderated those relations among variables such that for girls, self-control was a significant mediator, whereas for boys, self-control was not a significant mediator in the relationship between attachments and psychological well-being. In discussion, we suggest that attachment with each of the parents might be necessary to be compared in future studies. Also, we pointed out that depression and anxiety should be used as separated outcomes in the study.

노인일자리사업의 성과 예측 모형

모지환(Mo, Jee-hwan),유제민(Yoo, Jae-min),최정민(Choi, Jung-min) 호남대학교 인문사회과학연구소 2010 인문사회과학연구 Vol.29 No.-

본 연구의 목적은 지역구분(농촌지역과 도시지역)에 따라, 노인일자리사업 성과를 증가시키는 변인들의 조합을 확인하는 것이다. 이를 위해 의사결정나무 모형을 통해 노인일자리사업 성과에 대한 각 변인들의 타당성 검증의 절차를 거쳤다. 그 결과는 첫째, 농촌지역과 도시지역 노인일자리사업 성과를 가장 효과적으로 예측하는 변인은 참여자의 직무만족으로 나타났다. 둘째, 노인일자리사업 참여자가 직무에 대해 매우 만족한다는 조건하에 농촌지역은 (생계형/동료관계중시형/건강증진형) 모형이, 그리고 도시지역은 (공익형/건강증진형) 모형이 노인일자리사업 성과를 효과적으로 예측하는 것으로 조사되었다. 이상의 결과를 바탕으로 함의와 제언을 제시하였다. The purpose of this research is to develop a valid index to measure the outcome of the Job Creation Project for the elderly, especially focusing on living areas. The decision tree analysis was used to examine validity and identify the combination of variables that predict better outcomes of the Job Creation Project for the elderly, based on job satisfaction. Job satisfaction was the most important predictor to determine the outcome of the Job Creation Project for the elderly regardless of living areas. When the participants were very satisfied with their job, the conditions that predict the better outcome of the Job Creation Project for the elderly were different according to living areas. Participants in rural areas showed better outcomes if they spent salaries on their living expenses and utilized health care services more than three times per month, poorer outcomes if they were not satisfied with the relationship with co-workers. On the other hand, participants in urban areas showed better outcomes when they participated in public works, had disorders of the musculoskeletal system, were illiterate, or had an education level at the middle school and high school level. Implications and suggestions for further research are provided based on the results.