산업단지 및 일반생활 지역의 공기 중 톨루엔에 대한 개인노출 및 생체시료의 상관성 분석

이병준(Byoungjun Lee),허 정(Jung Heo),정다영(Dayoung Jung),김순신(Sunshin Kim),류현수(Hyeon-Su Ryu),최민지(Min-Ji Choi),솨이지엔페이(Jian-Fei Shuai),임성국(Sung-Guk Im),양원호(Wonho Yang) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.4

Objectives: The purpose of this study was to assess the correlation relationship between personal exposure and urinary hippuric acid in biological monitoring for airborne toluene in an industrial complex and in general environments. Methods: Personal exposure to toluene and its metabolite, hippuric acid, in urine were simultaneously measured in occupational environments area near an industrial complex and in general environments. The study subjects were divided into three types: 137 workers who use organic solvents in the workplace, 210 residents living near a dyeing industrial complex, and 379 residents living in general environments. The toluene exposures of workers and residents were measured by a passive sampler for four days. The urine of participants was sampled when the passive samplers of personal exposure were collected. Results: The toluene and hippuric acid concentrations of workers were the highest, followed by the concentrations of residents living near a dyeing industrial complex and residents living in general environments. The coefficient of correlation between the concentrations of toluene and hippuric acid among workers was 0.749 (p<0.01) in the workplace. On the contrary, correlations between the concentrations of toluene and hippuric acid among residents living near a dyeing industrial complex and residents living in general environments were all not significant. The relationship between the concentrations of hippuric acid and toluene in three types could be described by the exponential growth model. Conclusions: This study analyzed the relationships between toluene exposure and the concentrations of hippuric acid in urine in high, middle, and low exposure environments, and could be described by the exponential growth model.

PWM AC-DC 컨버터의 입력전류 직접추종제어

우정인,최선영,정영일,서정기,허태원 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-

본 논문에서는 PWM AC-DC 컨버터의 정상상태 제어오차를 제거하고, 과도 특성을 향상시키기 위한 새로운 전류제어계를 제안한다. 먼저, 일반적인 PWM 컨버터에 대한 상태공간 모델로 표현된 수학적 모델이 제시된다. 컨버터의 상태공간 모델은 제안하는 전류제어계를 포함한 PWM 컨버터의 시뮬레이션에 사용된다. 본문에서 제안하는 정현추종 제어계는 교류성분의 전류를 직접추정 제어 하기때문에 좌표변환 알고리즘을 필요로하지 않는다. 입력전류 제어계의 전달함수롤부터 정상상태 오차가 영이되는 것을 입증한다. 그리고, 시뮬레이션과 실험을 통하열 본 제어방식의 타당성을 입증하고자 한다.

공탄성시스템의 확률론적 제어에 대한 실험적 연구

김대중,박상태,정재욱,허훈,Kim, Dae-Jung,Park, Sang-Tae,Jeong, Jae-Uk,Heo, Hun 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.11

A Newly proposed control methodology applied to the aeroelastic system experiencing flutter is investigated and its performance is verified experimentally. The flexible cantilever beam slicked with piezofilm sensor and piezoceramic actuator is modelled in physical domain. Dynamic moment equation for the system is derived via Ito's stochastic differential equation and F-P-K equation. Also system's characteristics in stochastic domain is analyzed simultaneously. LQG controller is designed and used in physical and stochastic domain. It is shown experimentally that the vibration of beam is controlled effectively by designed LQG controller in physical domain. By comparing the result with that of LQG controller designed in stochastic domain, it is shown that the new control method, called Heo-stochastic control technique, has better performance as a controller.

수련활동, 여가문화활동이 청소년의 자아정체감 형성에 미치는 영향

허정철,김원옥,오을임 朝鮮大學校 統計硏究所 2006 統計硏究所論文誌 Vol.8 No.1

본 연구는 청소년들이 올바른 자아정체감을 형성하는데 영향을 미치는 요인을 수련활동, 여가문화활동에서 진단하고, 인과모형에 의한 분석결과를 통해 향후 청소년 정책수립을 위한 시사점 및 방안을 제언하였다. 이와 같은 연구모형과 가설을 검증하기 위하여 수련활동, 여가문화활동을 독립변수로, 자아정체감 형성의 구성요인으로 자아존중감, 성취동기, 사회성, 도덕성을 종속변수로 제시하였다. 연구모형과 변수간의 가설을 검증하기 위하여 각 변수별 조작화에 따른 설문문항을 5점 구성하고, 설문지를 광주광역시와 전라남도 내의 중 · 고등학교(인문계 · 실업계) 남 · 여학생들을 대상으로 하여 설문조사를 실시하였으며, 회수된 설문지를 통해 통계분석을 척도로 실시하였다. 먼저 측정도구에 대한 검증을 수행하기 위해 신뢰성 및 요인분석을 실시하였으며, 유의성 있는 문항을 중심으로 개인 및 집단간 차이검증을 실시하였다. 다음으로 연구모형에 의한 가설을 검증하기 위하여 다중회귀분석을 실시하였다. 실증분석 결과 청소년의 수련활동, 여가문화활동이 자아정체감 형성에 영향을 미치는 중요한 요인으로 확인되어 이에 대한 정책적 방안이 모색되어야 할 것으로 시사되었다. This study aims to diagnose factors that influence on proper ego-identity development of adolescents through a training activity, voluntary service for future adolescent policy through analysis of a causal model. As a result of the analysis, it was reported that training, leisure and cultural activites have an statistically significant influence on ego-identity formation of adolescents except the motive to achieve, a member of dependant variables. First, training activities have a significant influence on self-esteem, motive to achieve, sociality and morality, especially on development of sociality, So it was suggested that for the adolescents who need to be socially developed, active participation in training activities should be recommended to promote self-identity formation. Second, it was reported that leisure and cultural activites have a statistically significant influence on self-esteem, motive to achieve, sociality and morality, and especially on morality development. Therefore, it was suggested that leisure and cultural activites should be actively developed to help their self-esteem development. According to the results of analyses, it was confirmed that the training activity, leisure and cultural activity is an important factor that influences on ego-identity formation. It is suggested that a development program should be politically promoted. Therefore, this study presents suggestions for a future adolescent educational program in view of training activities, leisure and cultural activites.

전압형 PWM 컨버터의 전압 센서리스 제어

허태원,신동률,안인모,우정인 동아대학교 정보기술연구소 2000 情報通信硏究所論文誌 Vol.8 No.1

This paper presents a control scheme for a three-phase PWM converter system without any voltage sensors. Two input currents and one load current are measured. In a general PWM converter system, the required AC input and DC output voltage values in order to control the converter are estimated using the differential equations of the converter from the measured input currents and load current values in the switch modes of the converter circuit. The PI controller is used as DC voltage controller and sinusoidal tracking controller which tracks directly AC input current is used as input current controller. The proposed method is verified by simulations. This paper describes the estimation method and configuration of the controller, and discusses steady state and transient performances of the converter.

청소년 정책수립을 위한 전인교육 프로그램이 자아정체감 형성에 미치는 영향에 관한 실증적 연구

허정철 한국사회복지정책학회 2004 사회복지정책 Vol.20 No.-

본 연구는 청소년들이 올바른 자아정체감을 형성하는데 영양을 미치는 요인을 전인교육 프로그램에서 진단하고, 인과모형에 의한 분석결과를 통해 향후 청소년 정책수립을 위한 시사점 및 방안을 제언하였다. 본 연구의 연구모형과 가설을 검증아기 위하여 전인교육 프로그램을 독립변수로, 자아정체감 형성을 종속변수로 설정하였으며, 전인교육 프로그램의 구성요인으로 수련활동, 자원봉사활동, 여가문화활동을 도출·제시하였고 자아정체감 영성의 구성요인으로 자아존중감, 성취동기, 사회성, 그리고 도덕성을 도출·제시하였다. 연구결과 수련활동, 자원봉사활동, 여가문화활동은 자아존중감, 성취동기, 사회성, 도덕성에 모두에 유의한 영양을 미치는 것으로 나타났으며, 수련활동은 특히 사회성 발달에 가장 많은 영향력을 미치며, 자원봉사활동은 청소년의 도덕성 발달에 효과가 가장 많은 것으로 나타났으며, 여가문화활동은 자아존중감 형성에 효과가 가장 많은 것으로 나타났다. 이상과 같은 실증분석 결과에 의하면 청소년 전인교육 프로그램은 자아정체감 형성에 영양을 미치는 중요한 요인으로 확인되어 이에 대한 정책적 방안이 모색되어야 알 것으로 시사되었다. 따라서 본 연구는 이에 대안 시사점을 청소년 정책수립을 위한 방안으로써 수련활동, 자원봉사활동, 그리고 여가문화활동 측면에서 제언하였다. This study aims to diagnose factors that influence on proper self-identity development of adolescents through a whole person program and present suggestions for future adolescent policy through analysis of a causal model. As a result of the analysis, it was reported that training, voluntary service and leisure activities have an statistically significant influence on self-identity formation of adolescents except the motive to achieve, a member of dependant variables. First, training activities have a significant influence on self-esteem, motive to achieve, sociality and morality, especially on development of sociality. So it was suggested that for the adolescents who need to be socially developed, active participation in training activities should be recommended to promote self-identity formation. Second, it was reported that voluntary service has a statistically significant influence on self-esteem, motive to achieve, sociality and morality, and especially on morality development. Therefore, it was suggested that voluntary service program should be actively developed to help their morality development. Third, leisure and cultural activities have a statistically significant influence on self-esteem, motive to achieve, sociality and morality and especially on self-esteem formation. Therefore, it is suggested that leisure and cultural activity program should be actively developed to help their self-esteem development. According to the results of analyses, it was confirmed that the whole-person educational program is an important factor that influences on self-esteem formation. It is suggested that a development program should be politically promoted. Therefore, this study presents suggestions for a future adolescent educational program in view of training, voluntary service and leisure and cultural activities.

2007 학생생활연구소 내방 학생 특성에 대한 연구 : MBTI와 MMPI를 중심으로

허정은,한영옥 서울여자대학교 학생생활연구소 2007 학생생활연구 Vol.20 No.-

본 연구는 서울여대 학생생활연구소에서 심리검사를 실시한 133명을 대상으로 MBTI에 의한 성격유형과 MMPI에 나타난 심리특성과의 관계에 대한 연구를 통해 추후 상담에 활용할 수 있는 정보를 제공하고자 한다. 이 목적을 위해 먼저 관련된 선행연구들을 개관하였으며, 사용된 자료분석방법은 MBTI 연속 점수와 MMPI 임상척도들간의 상관관계분석, 다중회귀분석, 분산분석 들이었다. 내향적일 수록 MMPI Ma가 낮은 것으로 나타났고 감정형일수록 MMPI Hs가 상승하고 사고형일수록 Mf척도가 상승하는 것으로 나타났다. 직관형은 Pd, Sc, Ma 등이 상승하고 인식형은 L. K척도가 상승하는 것으로 나타났다. 분산분석 결과 내향적인 집단은 MMPI 척도 높은 D와 Si, Pt가 통계적으로 유의미하게 나타났고, 외향적인 집단은 낮은 D와 Si가 통계적으로 유의하게 나타났다. 연구결과 Jung의 성격유형과 MMPI에서 나타나는 정신 병리와의 관계가 상당히 지지되었다. MBTI와 MMPI의 자료를 종합적으로 활용하는 것이 내담자에 대한 폭넓은 이해를 증진시킬 수 있을 것으로 보여 진다. The purpose of this study is to help the better counselling for the students examining the characteristic features of the accumulated data of client that had been used tests including MBTI, MMPI in 133 university student. Above all, it examined the former articles on the related subjects, and the used statistical methods were simple correlation, multiple regression analysis, Anova. The score of I preference of MBTI were significantly positively related to Ma scale of MMPI. The score of F preference of MBTI were significantly positively related to Hs scale of MMPI. The score of T preference of MBTI were significantly positively related to Mf scale of MMPI. The score of P preference of MBTI were significantly positively related to Pd, Sc, Ma scales of MMPI. The score of J preference of MBTI were significantly positively related to L, K scales of MMPI. The result of One way Anova were follows. The score of Introversion type were significantly more high in D, Si, Pt scales of MMPI than other group. The score of Extroversion type were significantly more low in D, Si, Pt scales of MMPI than other group. Jung's theories of psychological types and the pathology were somewhat supported by the results of this study.

학교생활 부적응 요인이 학교사회사업 서비스 욕구에 미치는 영향에 관한 연구 : 고등학생을 중심으로

허정철,김원옥 朝鮮大學校 社會科學硏究所 2007 社會科學硏究 Vol.28 No.1

스포츠 자기관리 전략 : 이론적 고찰

허정훈 중앙대학교 스포츠과학연구소 2001 體育硏究 Vol.- No.14

This study was an attempt to theoretical approach for the 'self-management'. At first, the theory and definition looked over. Second, the variety of the views and model of it were showed. Moreover, the researches that closely related to 'self-management' were reviewed. Specifically the content of 'self-management' in the sports psychological skill and self-control strategies was explored, and the strategy of it in the real situation was discussed. This study was emphasized the athletes' performance improving and quality of their life. And it will be used for the basic source in the researching of 'self-management'.

지역사회 구강진료기관 치위생사 집단의 직무만족에 관한 조사

허희영,오정숙,성진효,김동기 조선대학교 구강생물학연구소 2002 Oral Biology Research (Oral Biol Res) Vol.26 No.2

This study is intended for suggesting some methods or measures to improve the working environment and dental service consequently by finding out general characteristics and various factors that affects the job satisfaction in the organization according to dental hygienists' job peculiarities and supplying dental hygienists' improvement in quality and good dental treatment with dental hygienists who work in the dental clinics in the community as study objects. In this study, to research and analyze dental hygienists' job satisfaction to improve dental hygienists' job satisfaction and promote efficiency in personnel management, 50 dental clinics where there were more than 5 dental hygienists were chosen at random and 250 dental hygienists who work there were given questionnaires and the questionnaires were analyzed and finally the result was as follows. Firstly, there are some general characteristics. The ages of 2.0~2.5 cover 68% of the dental hygienists. The unmarried occupied 81.2%. The size of the working place is the dental clinic(joint opening of a dental clinic), which occupied 54.2%. Secondly, there is a meaningful difference working ability, a sense of belonging and job stability or potentiality in case of job characteristics according to the marriage or singleness, and the married questionees are higher than the unmarried ones in the average value in all question sections. Thirdly, in case of the working Place that affects dental hygienists' job satisfaction there is a difference in the working region and no difference in the working place. Fourthly, it was found out that the difference between variables according to the region is meaningful. In working ability and job stability or potentiality, there is a meaningful difference according to the region. Lastly, the things that should be improved in the dental clinics are guarantee of job stability or potentiality, harmony in the group, publicity work, geographical conditions, improvement in dental treatment level, degree of reliability and kindness for patients , equipment. and finally hygiene.