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.

수시 학생부 교과전형에서의 수능최저등급 완화 방안에 대한 연구

홍정의,허민규 한국교통대학교 2015 한국교통대학교 논문집 Vol.50 No.-

The goal of this study is analyze the relationship between student high school grade and university academic achievement also Scholastic Ability Test score and university academic achievement. Department of Education continuously asked reduce the types of admission and mitigate admission restriction. For the purpose of simplify university admission process, we need to mitigate or remove the minimum standard of SAT score. At this research, analyzed the effects of mitigating minimum SAT score and suggested possible solution

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'.

鼻의 生理機能에 대한 硏究

許埈寧,姜政秀 대전대학교 한의학연구소 2000 혜화의학회지 Vol.9 No.1

The following results obtained through studies related on nose. 1. Nose is called mingtang(明堂)·mianwang(面王), as it emphasize the meaning of viewing diagnosis(望診) and is called yuangpinzhimen(元牡之門), tianpinzhimen(天牡之門), qiqizhimen(七氣之門) as it emphasize the meaning of the entrance of atmosphere flow. Because it's position is the middle of face, we call tianzhongzhiyue(天中之嶽), zhongyue(中嶽). 2. As the organ of body, nose comes under the category of lung-iron(肺金), functionally comes under the category of heart-fire(心火). Functionally we can smell oder, organically nose is the pathway of respiration and to be resonator. 3. Wuzangliufu(五臟六腑) is arranged closely around the nose. The essence of wuzangliufu(五臟六腑) reflect nose, so nose becomes the standard of coloring diagnosis(色診). 4. We call nose is feihou(肺候), but it is not connected directly between the lung channel and nose. In case of lung symptom(肺證), first of all, nose become to appear the condition of lung, the lung channel and nose is close functionally. 5. The view of channels, nose is a connection with channels of yangming(陽明), bladder(膀胱), du(督脈) directly. By the connecting of each three channels, spleen stomach heart and kidney(脾胃心腎) are connected with indirectly. As the result of the relation, nose helps for body to breathe and to circulate qi(氣) and smell. And so the nature of wuzangliufu(五臟六腑 ) appear to the nose. 6. Particularly, the yangming channel(陽明經), and the bladder channel(膀胱經) are important. Because air-qi(天氣) reach to kidney·lung through nose, ground-qi(地氣) reach to spleen·stomach through mouth and yingwei(營衛) revolve through the bladder channel(膀胱經). As the result nose becomes the essential organ of circulation of yingwei(營衛), ascent and descent of qi(氣).

골프장 경기보조원의 근골격계 자각증상과 관련 요인

허경화,한영선,정혜선,구정완 大韓産業醫學會 2004 대한직업환경의학회지 Vol.16 No.1

목적: 직업관련성 근골격계질환과 관련된 여러 가지 위험요인에 노출되어 있는 경기보조원의 작업내용과 관련하여 근골격계 증상 유발 양상을 파악하고, 근골격계 증상 관련 요인을 파악하고자 하였다. 방법: 경기도 지역에 있는 6개 정규 골프장을 대상으로 경기보조원 316명에 대하여 2003년 4월 9일부터 4월 30일까지 3주간 설문지를 배부한 후 자기 기입 식으로 작성하게 하여 수거함으로써 자각증상 조사를 실시하였으며, 설문지는 미국 산업안전보건연구원이 사용하는 표준화된 설문지(NIOSH, 1993)의 국내 번역판(노상철 등, 1997)을 이용하였다. 결과: 조사대상 경기보조원의 신체 부위별 근골격계 자각증상 호소율은 다리/무릎/발목/발이 41.8%로 가장 높은 증상 호소율을 보였으며 어깨 35.8%, 등/허리 35.8%, 목 28.8%, 팔/손목/손가락 28.5% 순 이었다. 성수기의 1일 근무시간이 팔/손목/손가락 부위를 제외한 나머지 부위에 영향을 주는 것으로 나타났다. 경기보조원의 업무특성과 관련하여 골프장의 경사와 굴곡의 정도, 내장객의 폭언 및 폭행, 업무의 속도를 조절할 수 없음, 일의 육체적 부담의 강도, 고용의 불안정성, 직장을 잃을 가능성 등이 근골격계 자각증상과 유의한 연관성을 보였다. 직무스트레스 특성에서는 정신적 직무요구도가 높은 반면, 낮은 직무 재량도를 보여 근무긴장도가 높은 것으로 조사되었다. 다변량 로지스틱 회귀분석을 실시한 결과 목 부위, 어깨 부위, 등/허리 부위 및 다리/무릎/발목/발 부위의 근골결계 증상에는 성수기 12시간 이상의 근무시간이, 팔/손목/손가락 부위의 증상에는 낮은 직무 재량도에서 유의한 영향을 미치는 요인으로 관찰되었다(P<0.05). 결론: 경기보조원의 근골격계 증상은 과중한 업무시간과 높은 직무요구도에 비해 낮은 직무재량도를 보이는 고긴장 직무 등에 의해 호소율이 높게 나타남을 알 수 있다. 근골격계 질환의 호소 요인에 대한 구체적인 대안의 마련과 더불어 정부기관에서 주도적으로 검토하여 경기보조원들이 속해있는 골프장 운영업체가 근골격계질환의 예방을 위한 조치와 경기보조원의 건강과 관련한 안전보건교육 등을 시행할 수 있도록 하는 방안이 마련되어야 할 것으로 본다. Objectives: This study evaluated the complaint rates of musculoskeletal symptoms and investigated the related factors of musculoskeletal symptoms in the caddies. Methods: For 316 caddies working at 6 regular golf courses, we used the self-recording questionnaires to examine general characteristics, job stress factors, subjective musculoskeletal symptoms designed by NIOSH, working environments, and working contents. Results: The complaint rates of musculoskeletal symptoms according to the musculoskeletal criteria of NIOSH were 41.8% in leg/knee/ankle/foot, 35/8% in the upper back/lower back, 28.8% in the neck, and 28.5% in the arm/wrist/fingers. Important factors affecting musculoskeletal symptoms were daily working hours during the high-demand seasons in all anatomical sites except the arm/wrist/fingers. Other related factors were degrees of winding and inclined in the golf courses, violent language and violence of customers, inability to regulate the velocity and work load control, heavy physical burden, instability of employment, and possibility of unemployment according to the specialty of caddies. As a results of multivariate logistic regression analysis, musculoskeletal symptoms of the neck, shoulders, back/lower back and leg/knee/ankle/foot were significantly influenced by working time over 12 hours in the high-demand season, and symptoms of the arm/wrist/fingers by low decision latitude (P<0.05). Conclusions: The complaint rates of musculoskeletal symptoms in the caddies were affected by working time over 12 hours and low decision latitude against excessively high psychological job demand.

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.

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.

전반사형 외인성 페브리 페롯 광섬유 압력센서의 설계

허진석,이정주 경북대학교 센서기술연구소 2002 센서技術學術大會論文集 Vol.13 No.1