일반성인에서의 생활 스트레스가 정신증상 및 신체에 미치는 영향

김영철,정향균,이시형 大韓神經精神醫學會 1989 신경정신의학 Vol.28 No.2

In this study the authors tried to find out the amount of life stress and it's effects on psychiatric symptoms and physical condition in physically healthy subjects who checked their physical health at Koryo General Hosptial from June 1 to Oct. 31 1987. 1) The amount of life stress was net significantly correlated with their socioeconomic characteristics. 2) Psychiatric symptoms such as somatization, obsession-compulsion, depression, anxiety, hostility and psychoticism, were more severe in the female group than the male group(P<0.01). 3) The subjects in their the 50s, the less educated and the service workers suffered more from psychiatric difficulties than the groups of the other age, the higher educated and the other occupations. 4) The psychiatric symptoms except paranoia were higher in the group with the income of less than 500,000 won a month(P<0.01) and the psychiatric symptoms such as somatization, obsession-compulsion, depression(P<0.01), interpersonal sensitivity, anxiety and phobic anxiety(P<0.05) were also higher in the group who were unsatisfied with their economic status. 5) Higher the life stress became, the psychiatric symptoms such as somatization, obsession-compulsion, interpersonal sensitivity and depression, and the serum level of triglyceride and T4 were also increased(P<0.05). 6) From the above finding that the amount of life change unit and the psychiatric symptoms were higher in the 5th decade and there were positive relationship among life stress, psychiatric symptoms, serum trigliceride and T4, the authors speculate that this age group might be particularly vulnerable to suffer from atherosclerosis or coronary heart disease than the other age groups.

CMC계 수용성 섬유의 물리적 강도향상 첨가제에 관한 연구

최영민,정의현,박진원,신재균,Kajiuchi, Toshio,Hong, Kyung jin 한국공업화학회 2003 응용화학 Vol.7 No.2

The aim of this research was to develope the additive for physical strength improvement of water soluble fiber(CMC) using viscose rayon. Experimental parameters were reaction time and concentration of MgSo₄. Firstly, solubility of carboxymethylcellulose(CMC) according to the addition of MgSO₄ was tested at room temperature with water. Secondly, through the examination of the FT-IR spectra, absorption band caused by hydroxyl group and carboxyl group was confirmed.

Silaethene CL₂Si=CHCH₂?Bu의 엔반응 : Unsaturated Compounds of 14Group Elements(Ⅸ)

김정균,박은미,구미영,박경래,손병영 東亞大學校 大學院 1992 大學院論文集 Vol.17 No.-

Silaethene Cl₂Si=CHCH₂?Bu 1, generated as a reaction intermediate by the thermal elimination of LiX from Cl₃SiCHLiCH₂?Bu 2, combines with ene-component containing compounds(propene, 2-methylpropene, DMB) to give 40∼90% yield ene-products. They can be isolated and spectroscopic identified.

일부 부인과 양성 질환자의 지방조직 및 혈청의 PCBs와 DDE 농도

박성균,이강숙,노영만,구정완,민선영,한진구,고원경,김미란,정재근,이종승,김진홍 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.1

목적 : 본 연구는 지방조직과 혈청의 PCBs와 DDE 농도를 측정하고, 이에 영향을 미치는 것으로 알려진 요인들과의 관련성을 평가하고자 하였다. 방법 : 유방암, 자궁내막증 등 유기염소계 화합물의 영향이 있는 것으로 알려진 호르몬 관련 질병을 제외한 부인과 환자 52명을 대상으로 지방조직과 혈청을 분석하였으며, 설문조사를 통하여 연령, 교육수준, 직업, 비만도, 흡연과 음주, 출산력, 수유력등을 조사하였다. 지방조직과 혈청의 PCBs와 DDE 농도는 가스크로마토그래피를 사용하여 측정하였다. 결과 : 지방조직의 경우, 13개 PCBs congeners 농도의 합은 중앙값이 48.29 ng/g, 기하평균값이 56.78 ng/g이었고, DDE 농도는 중앙값이 142.89ng/g, 기하평균값이 117.06 ng/g이었으며, 혈청의 경우는 PCBs congeners 농도의 합은 중앙값이 4.67 ㎍/L, 기하평균값이 4.85 ㎍/L이었고, DDE 농도는 중앙값이 1.75 ㎍/L, 기하평균값이 2.09 ㎍/L로 나타났다. 지방조직과 혈청의 DDE 농도 사이는 높은 상관성을 보였으나(r²=0.310, p=0,0002), PCBs는 상관성이 약한 것으로 나타났다(r²=0.029, p=0.2582). 영향요인을 범주화한 후 로그변환 시킨 지방조직과 혈청의 PCBs, DDE 평균의 차이를 분석한 결과, 지방조직의 DDE만이 출산자녀수(p=0.015), 초산연령 (p=0.014), 비만지수(p=0.035)와 연관성이 발견되었다 다중회귀분석의 결과 지방조직의 DDE는 출산자녀수가 적을수록, 초산연령이 늦을수록 증가하는 경향을 보였다. 결론 : 출산자녀수와 초산연령, 비만도가 지방조직의 DDE와 관련성을 보였으며, 또한 유기염소계 화합물의 장기간의 노출에 의한 영향을 평가하는데 있어서 혈청보다 지방조직이 더 유용한 생물지표임을 알 수 있었다. Objectives : This study was purposed to determine the levels of PCBs and DDE in adipose tissue and serum and to evaluate the relations with factors affecting these levels. Methods : We analyzed adipose tissues and sera from 52 gynecologic benign disease patients aged 27-78 years, except hormonal diseases such as breast cancer and endometriosis. We also surveyed age, education, occupation, body mass index (BMI), smoking, drinking, number of children, and duration of breastfeeding by questionnaires. Tissue and serum levels of PCBs and DDE were measured using gas chromatography. Results : The median and geometric mean levels of PCBs were 48.29 ng/g, 56.78 ng/g for adipose tissue and 4.67 ㎍/L, 4.85 ㎍/L for serum, and those of DDE were 142.89 ng/g, 117.06 ng/g for adipose tissue and 1.75 ㎍/L, 2.09 ㎍/L for serum, respectively. Adipose tissue and serum levels for DDE showed high correlation (r²=0.310, p=0.0002), but those of PCBs didn't (r²=0.029, p=0.2582). In analyses of the differences of the means of log transformed adipose tissue and serum PCBs and DDE levels for groups of potential covariates, only adipose tissue DDE levels were significantly associated with number of children (p=0.015), age at first birth (p=0.074) and BMI (p=0.035). In multiple regression analysis, adipose tissue DDE levels were significantly increased with decreasing number of children and increasing age at first birth. Conclusions : This study suggested that parity and adiposity were associated with levels of DDE in adipose tissue, and adipose tissue is a better biomarker than serum for evaluating the long-term exposure of organochlorines.

선반 기어박스의 기어열 - 축계 진동 해석 및 저감에 관한 연구

최영휴,박선균,배병태,정택수,김청수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-

In this study, torsional and lateral vibrations of a gear box transmission system were analyzed theoretically using some mathematical models and examined to determine the causes of its excessive vibrations. As the results, it was found there exist possibility of resonance between gear mesh frequencies and lateral vibration mode of the transmission shaft during the third shifting mode operation. In order to avoid this resonance, we proposed changing the arrangement of gears on the transmission shaft. The measured vibration levels of the improved gear box were dramatically reduced. These results may be helpful to design a machine tool gear box with low noise and vibration.

NC선반 기어박스의 기어열 : 축계 진동해석 Spindle System for an NC Lathe Gear Box

최영휴,박선균,배병태,정택수,김청수 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-

In this study, two mathematical models are first constructed to analyze vibration characteristics of a gear train - spindle system of an NC lathe gear box. One is a lumped parameter model which is used for calculating natural frequencies of the torsional vibration, the other is a finite element model for analyzing lateral vibration and critical speeds of the spindle system. In addition, this study examines some possible resonance conditions such as gear mesh frequencies, IX shaft rpm frequencies over whole operating speed range, and so on. The results may be helpful to design a machine tool gear box with low noise and vibration.

능동 클램프 ZVS 플라이백 컨버터의 역률개선에 관한 연구

최태영,류동균,이우석,안정준,원충연,김수석 성균관대학교 2002 학술회의지원논문목록집 Vol.2002 No.-

본 논문에서는 single-stage, two-stage 두가지 역률보상(PFC)기법을 기존의 능동 클램프 플라이백 컨버터에 적용하여 역률 개선을 하였다. 삽입된 플라이백 컨버터의 능동클램프회로가 주스위치와 보조스위치의 영전압스위칭(ZVS)을 구현하며, 스위칭 손실을 줄임으로써 고효율을 얻을 수 있고, 높은 주파수에서의 스위칭이 가능하다. 하지만 일반적으로 사용되는 다이오드정류기, 평활용커패시터에 의한 낮은 역률의 문제점이 남아있다. 본 논문에서는 300W급 능동 클램프ZVS플라이백 컨버터를 설계하여 single-stage, two-stage방식을 적용, 입력역률개선을 시뮬레이션과 실험에 의해 입증하고자 한다. This paper analyzed PFC of active clamp ZVS flyback converter by adding two method PFC (Power Factor Correction) circuit - two-stage and single-stage. The addition of active clamp circuit also provide a mechanism for achieving ZVS of both the primary and auxiliary switches. ZVS also limits the turn off di/dt of the output rectifier, reducing rectifier switching loss and switching noise, due to diode reverse recovery. As a results, the proposed converters have characteristics of the reduced switching noise and high efficiency in comparison to conventional flyback converter. The simulation and experimental results show that the proposed converters improve the input PF of 300W ZVS flyback converter by adding single-stage, two-stage PFC circuit.

하악골 후퇴 수술 환자의 연조직 측모 예측의 정확성 : Quick Ceph Image Pro™(ver 3.0)와 V-Ceph™(ver 3.5)의 비교 a comparison of Quick Cept Image Pro™(ver 3.0) and V-Ceph™(ver 3.5)

김명규,최용성,정송우,전영미,김정기 대한치과교정학회 2005 대한치과교정학회지 Vol.35 No.3

본 연구는 Quick Ceph Image Pro^(™)(ver 3.0)와 국내에서 개발되어 사용 중인 V-Ceph (ver. 3.5) 2 종의 비디오 이미지 예측 프로그램의 수술 후 연조직 측모의 정확성과 신뢰성에 대해서 알아보고자 시행되었다. 골격성 Ⅲ급 부정교합으로 진단되어 수술 전 교정 치료를 받고, 하악골 후퇴 수술(body osteotomy 또는 SSRO)을 시행한 남녀 환자 각각 20명을 대상으로 하였다. 나이는 평균 21.4 ± 4세이고, 수술 전 측모두부방사선계측사진은 수술 전 평균 21.1일에, 수술 후 측모두부방사선계측사진은 수술 후 평균 335.7일에 촬영되었으며, 예측치와 실측치 차이를 비교하였다. 연구결과 Quick Ceph과 V-Ceph 모두 예측치와 실측치 사이에 크기와 방향에 있어서 오차가 관찰되었으며 이러한 오차는 상순과 하순, 턱과 연관된 항목에서 크게 나타났다 (p〈0.05). Quick Ceph은 A', Ls, Li의 수평적 위치 및 각 부분에서의 연조직 두께(Ul-Ls, L1-Li, Pog-Pog')의 수평거리 예측에서,Y-Ceph은 하순의 수직적 위치 예측에서 오차가 컸다 (p〈0.05) V-Ceph의 경우 하악골의 이동양이 증가할 때 Sn의 수직적 위치, Ls의 수평적 위치, 상순의 연조직 두께(U1 -Ls)처럼 상순과 연관된 계측치에서 예측오차가 컸으며, Quick Ceph의 경우 하악골의 이동양이 증가할 때 하순의 수평위치 및 하순의 두께에서의 예측오차가 작았다 (p〈0.05). 또한, 연조직의 두께에 따른 오차를 평가한 결과, Quick Ceph의 경우 상순과 하순의 두께가 두꺼울수록 각각에 관련된 연조직 예측의 오차가 컸으며 (p〈0.05), Y-Ceph의 경우 하순과 턱의 연조직 두께가 두꺼울수록 턱의 연조직 예측의 오차가 크게 관찰되었다 (p〈0.05). 그러나, 본 연구에서의 모든 예측오차값은 3 mm 이내로 계측되었으며 이러한 오차 범주는 임상적으로 허용 가능한 수준인 것으로 생각된다. The purpose of this study was to test and compare the accuracy and reliability of soft tissue profile predictions generated from two computer software programs (Quick Ceph Image Pro^(™) (ver 3.0) and V-Ceph^(™) (ver 3.5)) for mandibular set-back surgery. The presurgical and postsurgical lateral cephalograms of 40 patients (20 males and 20 females) were traced on the same acetate paper with the reference taken as the cranial base outline. The presurgical skeletal outlines were digitized onto each computer program and the mandible was moved to mimic the expected surgical procedure with reference to the mandibular anterior border and lower incisor position of the actual postsurgical skeletal outline. The soft tissue profile was generated and the amount and direction of skeletal movement was calculated with each software. The predicted soft tissue profile was compared to the actual postsurgical soft tissue profile. There were differences between the actual and the predicted surgical soft tissue profile changes in the magnitude and direction, especially the upper lip, lower lip and the soft tissue chin (p〈0.05). Quick Ceph had more horizontal measurement errors and thickness errors for the upper lip and lower lip, but V-Ceph had more vertical measurement errors of the lower lip (p〈0.05). There was a positive correlation between the prediction errors and the amount of mandibular movements in the vertical position of Sn, the horizontal position of Ls and the upper lip thickness for V-Ceph, and there was a negative correlation in the horizontal position and the thickness of the lower lip for Quick Ceph (p〈0.05). However, all of the prediction errors of both imaging softwares were ranged within 3 mm, and this was considered to be allowable clinically.

실라에텐 Cl_2Si=CHCH_2^tBu의 생성과 반응성 : Unsaturated Compounds of 14 group Elements(IX)^1

金貞均,朴恩美,具美英,朴慶來,孫炳榮 충남대학교 약학대학 의약품개발연구소 1993 藥學論文集 Vol.9 No.-

Lithiated 화합물인 Cl_3SiCHLiCH_2′Bu로부터 LiCl의 제거반응에 의해 생성된 준안정 반응중간체인 silaethene, Cl_2Si=CHCH_2′Bu은 propene, 2-methylpropene, 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, anthracene과 반응하여 엔반응 생성물, 2+2-, 2+4-고리화부가 생성물을 생성한다. 이들을 분별진공증류법에 의해 분리하였고 분광학적으로 확인하였다. Silaethene Cl_2Si=CHLiCH_2′Bu, generated as a metastable reaction intermediate by the thermal eliminatio of LiCl from lithiated compound Cl_3SiCHCH_2′Bu, react with propene, 2-methylpropene, 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, and anthracene to give ene-reaction product, 2+2-, and 2+4-cycloadducts. They are isolated by vacuum fractional distillation method and spectroscopically identified.

청소년 수련시설 안전기준 제안을 위한 연구

洪榮均,鄭朱然 홍익대학교환경개발연구원 2001 환경개발연구논문집 Vol.6 No.-

Youth training facilities have been increased in terms of quantity since 1990s. Such a remarkable external growth should be foundation for youth training activities to build on. However, the disregard of growth in quality resulted in many problems to the safety management. The purpose of this research investigates the problems not in terms of programs but in terms of management for efficiency and safety, and proposes the alternative way for development.