한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.

민감도 분석을 이용한 겹치기 필릿용접의 용접변수 선정에 관한 연구

정재원,김일수,김학형,손성우,전광석 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

Arc welding process is one of the most important technologies to join metal plates. Robotic welding offers the reduced manufacturing cost sought, but its widespread use demands a means of sensing and correcting for inaccuracies in the part, the fixturing, and the robot. A number of problems that need to be addressed in robotic arc welding processes include sensing, joint tracking, and lack of adequate mathematical models for parameter prediction and quality control. Problems with parameter settings and quality control occur frequently in the GMA(Gas Metal Arc) welding process because of the large number of interactive parameters that must be set and accurately controlled. The objectives of this paper are to realize the mapping characteristics of bead width using a sensitivity analysis and multiple regression method, and finally select the most accurate model in order to control the weld quality(bead reinforcement area, bead penetration area) for lap joint fillet welding.

해산어류와 두족류의 Anisakids Iarvae의 감염현황

손성원,이정훈,정영모,최용만 경남대학교 환경문제연구소 1994 환경연구 Vol.16 No.-

In this study, the infection status of the anisakids larvae was investigated. 8 species marine fishes and 2 species cephalopoda purchased from the near Southern sea in Korea, were examined to provide the importance of infection source of human body and the basic data for the prevention. The results obtained from this study were as follows. 1. The infection rate of anisakids larvae in marine fishes was 100% in Trichiurus lepturus, 100% in Scomber japonicus, 75.0% in Trachrus japonicus, 70.0% in Pseudosiciaena manchurica, 69.23% in Astroconger myriaster, 58.33% in Konosirus punctatus, 40.0% in Liparis tanakai, 20.0% in Seriola quinqureradiata, respectively. And, the infection rate of anisakids larvae in cephalopoda was 40.0% in Sepiella maindroni but Octopus rariabilis was not infected at all. 2. The total number of anisakids larvae collected from the parasitic organs was 2,199. The details were as follows: 1,032(46.93%) in the viscera, 868(39.47%) in the omentum. 191(8.69%) in the stomach, 82(3.73%) in the liver and 26(1.10%) in the muscle, respectively.

Cl이 첨가된 ZnSe의 특성 연구

손정식,김인수,이동건,배인호,박성배 嶺南大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.16 No.-

The electrical and structural properties of Cl-doped ZnSe epilayers have been studied by Hall effect measurement, Photoluminescence(PL), and chemical etching. By using ZnCl₂ as dopant source, the high quality n-type ZnSe layers with electron concentrating up to ?? have been achieved. Hall mobility for an epilayer with ?? are ~ 400 ㎠/V.s at 300 K and ~ 900㎠ /V.s at 80 K. These values are close to those reported for the homoepitaxial layer. For heavily doped samples, Cl donors are partially compensated. The PL measurements were performed at 11 K and 300 K. The excitonic emission associated with a neutral donor is dominant in the samples doped with Cl concentration below ~??. The carrier compensation was discussed with ?? complex as reported origin of self-activated(SA) emission in previous reports. The micrographs of etched surface by Br-methanol dilute solution showed that the lattice defects were increased with doped Cl concentration.

민감도 분석을 이용한 필릿용접용 용접변수 선정에 관한 연구

정재원,김일수,김학형,손성우,김인주,전광석 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

Arc welding process is one of the most important technologies to join metal plates. Robotic welding offers the reduced manufacturing cost sought, but its widespread use demands a means of sensing and correcting for inaccuracies in the part, the fixturing, and the robot. A number of problems that need to be addressed in robotic arc welding processes include sensing, joint tracking, and lack of adequate mathematical models for parameter prediction and quality control, Problems with parameter settings and quality control occur frequently in the GMA(Gas Metal Arc) welding process because of the large number of interactive parameters that must be set and accurately controlled. The objectives of this paper are to realize the mapping characteristics of bead width using a sensitivity analysis and develop the neural network and multiple regression method, and finally select the most accurate model in order to control the weld qua1ity(bead width) for fillet welding. The experimental results show that the proposed neural network estimator can predict bead width with reasonable accuracy, and guarantee the uniform weld quality.

전문 문서 개념을 사용한 지식 미디어 시스템에 관한 연구

손영수,조정래,배상현 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.4

The knowledge of the specialized fields has seen changed rapidly in the both side of quantity and quality. A hyper media as a knowledge based system is so fixed in the linked media in mutual that we couldn't tell it information provision with the view of users. In this paper, we propose the way of offering intellectual and flexible information which is the same with demand in the side of user, selecting, searching and composing the hypertext at the point of user's view through the design of knowledge media system. Three concepts are used in order to challenge the knowledge media system : special document, agent system and ontology. The special document is a knowledge using special fields. The agent system is a homogeneous controller that operates on an application to ensure that its activities are coordinated with those of the others within the community, providing a uniform control mechanism. Finally, ontology is a language for exchanging knowledgement, which is a message exchanged among agents to ensure the proper interaction among them. The combination of these three concepts is used to design the prototype of knowledge media system.

심한 요관협착을 동반한 환자에서 요관부목의 효과적인 교환 방법

손정문,장성구 大韓泌尿器科學會 1998 Korean Journal of Urology Vol.39 No.4

새로운 구조의 챠지펌프 방식를 사용한 직류-직류 변환기설계

한정우,손상희 청주대학교 산업과학연구소 2014 産業科學硏究 Vol.31 No.2

In this paper, output voltage conversion type of DC to DC converter using charge pump method is newly proposed and designed. In conventional cross-coupled charge pump, simulation results show that output voltage is 5.93V and efficiency is 99% and numbers of capacitor are 3 in case of step-up factor, 2. But simulation results using proposed charge pump in same condition show that output voltage is 5.96V and efficiency is 99% and numbers of capacitor are 2. From the simulation results, we know that output voltage and efficiency is similar between cross-coupled charge pump and proposed charge pump. But reducing capacitor makes chip size small and decrease cost down. In the proposed circuit, it is possible to remove the body effect secondary effective MOS by adding a body control system. It is possible to prevent that it is possible to prevent the shift in the threshold voltage of the MOS by the body controls, a result, the efficiency of the overall circuit is reduced. Also output voltage conversion is accomplished by varying the resistance ratio of the switch. Circuit simulations are executed with the design rule of magnachip 5V/30V 0.7um power-CMOS(Complementary Metal-Oxide Semiconductor) process and Cadence Spectre simulator.

안식향산 함유 식품 섭취가 톨루엔 폭로 근로자들의 요중 마뇨산 농도에 미치는 영향

심상효,손정일,박정일 大韓産業醫學會 1996 대한직업환경의학회지 Vol.8 No.3

This study was performed to investigate the effect of foods containing benzoic acid on the urinary hippuric acid concentration in the toluene exposed workers. The urinary hippuric acid concentration were measured at 0, 30, 60, 90, 120 and 150 minute after intake of soft drink and bread containing benzoic acid in volunteers, who did not have been exposed toluene occupationally. After that urinary hippuric acids were measured at the end of shift in toluene exposed workers. And also the concentration of toluene in air were analysed by gas chromatography. So the relationships between urinary hippuric acid concentration and age, work duration, concentration of toluene in air and intake of benzoic acid containing food were observed. The results were as follows: 1. The urinary hippuric acid concentration reached the highest level at 30 minute after intake of soft drink with bread at a level of 1.41g/g creatinine and soft drink alone at a level of 1.04g/g creatinine which contained benzoic acid among unexposed toluene, and then gradually decreased. 2. In toluene exposed group to significant effect of general characteristics such as gender, age, work duration, drinking and smoking on urinary hippuric acid concentration was showed in toluene exposed group. 3. The mean value of urinary hippuric acid concentration of group taking benzoic acid containing foods was significantly higher than that of group not taking. 4. Multiple regression analysis showed that toluene concentration in air and benzoic acid containing foods were together significantly influence on urinary hippuric acid concentration. And the function between variables is Y=0.014Toluene+0.489Benzoic acid+0.745 and the contribution rates were 31%. In conclusion, it was suggested that the information on intake of benzoic acid containing foods should be considered in measurement of urinary hippuric acid for the more accurate toluene exposure evaluation.

골격성 Ⅲ급 부정교합자의 편악수술과 양악수술후 재발경향에 관한 비교연구

김정록,손우성 대한치과교정학회 1995 대한치과교정학회지 Vol.25 No.5

본 연구는 골격성 Ⅲ급 부정교합 환자에서 술전 상태오 수술방법 사이의 관계 및 악교정 수술후 재발경향을 조사하기 위하여 시행하였다. 연구 대상으로는 악교정수술을 받은 31명(남자 17명, 여자 14명)을 선택하였고, 이중 20명은 편악수술, 11명은 양악수술을 시행하였으며, 평균연령은 22.5세였다. 각 대상에서 술전, 수술직후, 1년 이상 경과 후의 측모두부방사선 규격사진을 채득하여, 투사도를 작성하고, 분석하여 다음과 같은 결과를 얻었다. 1. 하악만을 수술한 군보다 양악 동시수술군에서 하악체의 길이가 4.24mm, 하안모 고경의 길이가 4.64mm, 하순의 길이가 4.13mm 더 길게 나타났으며, 반면 수평피개도는 3.13mm 더 작게 나타났다. 2. 하악만을 수술한 군에서 8.95±4.45mm 하악이 후방이동되었으며, 양악 동시수술군에서 상악은 5.15±3.46mm 전방이동되었고, 하악은 7.24±9.11mm 후방이동되었다. 3. 최소 1년 이상 경과 후와 수술직후의 변화에 있어서 양악 동시수술군에서 A point는 1.02±2.14mm, Pn에서는 1.05±1.48mm, Sn에서는 1.55±1.37mm 후방이동되었다. 4. 최소 1년 이상 경과 후와 수술직후의 변화에 있어서 B point에서 하악만을 수술한 군은 28% 양악 동시수술군은 8%, B´point에서 하악만을 수술한 군은 24%, 양악 동시수술군은 3% 전방이동되었다. The purpose of this study was to investigate the degree of relapse following orthognathic surgery and the relationship between preoperative state and the methods of orthognathic surgery in skeletal Class Ⅲ patients. Thirty-one patients were selected(17 men, and 14 women) for this study, who had received orthognathic surgery(20 one jaw surgery, and 11 two jaw surgery). The mean age was 22.5 years. Their lateral cephalograms, that were taken preoperatively, immediate postoperatively and follow-up over one year, were traced and analysed. The results were as follows : 1. In two jaw surgery, mandibular length, lower facial height and lower lip length were 4.24mm, 4.64mm and 4.13mm longer than in one jaw surgery, respectively. But in two jaw surgery, overjet was 31.3mm shorter than in one jaw surgery. 2. In one jaw surgery, mandible was move back 8.95±4.45mm at B point. In two jaw surgery, maxilla was moved forward 5.15±3.46mm and mandible was moved back 7.24±9.11mm at B point. 3. Between postoperation and follow-up over on year, A point, A´point, Pn and Sn were moved backward 1.02±2.14mm, 1.73±1.63mm, 1.05±1.48mm and 1.55±1.37mm in two jaw surgery, respectively. 4. Between postoperation and follow-up over one year, in one jaw surgery, B point was moved forward 2.58±4.22mm and B´point was moved forward 1.95±4.39mm. In two jaw surgery, B point was moved forward 0.65±2.88mm and B´point was moved forward 0.19±3.32mm. In one jaw surgery, relapse rate was 28% at B point and 24% at B´point, whereas in two jaw surgery, relapse rate was 8% at B point and 3% at B´point.