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.

Lidocaine, Thrombin, Epinephrine 의 항균효과

김진우,이동건,전혜선,김승준,김석찬,안중현,김치홍,권순석,김영균,김관형,문화식,신완식,송정섭,박성학 대한감염학회 2005 감염과 화학요법 Vol.37 No.6

목적 : 기관지내시경 검사에서 흔히 사용되는 국소마취제인 lidocaine과 내시경시 지혈목적으로 사용되는 thrombin과 epinephrine이 각종 균주에 미치는 항균효과에 대해 알아보고자 하였다. 재료 및 방법 : 균주는 가톨릭대학교 성모병원에서 2004년 3월부터 2004년 9월까지 임상검체 에서 동정된 S. aureus, S. pneumoniae, K. pneumoniae, P. aeruginosa 각각 42, 42, 42, 43주를 대상으로 하였다. Lidocaine, thrombin, epinephrine 감수성 검사는 National Committee for Clinical Laboratory Standards (NCCLS, 2002)의 기준에 따랐다. 결과 : Lidocaine은 S. aureus, S. pneumoniae, P. aeruginosa에서 MIC_(50), MIC_(90) 모두 20,000 ㎍/mL 이었다. K. pneumoniae는 각각 10,000 ㎍/mL이었다. Thrombin은 S. aureus와 P. aeruginosa에서 MIC50 500 lU/mL 과 MIC_(90) 500 IU/mL 이상이었고, K. pneumoniae에서는 MIC_(50)과 MIC_(90)이 모두 500 lU/mL이상이었으나 S. pneumoniae에서는 MIC_(50)과 MIC_(90)은 125 IU/mL이었다. Epinephrine은 K. pneumoniae, S. pneumoniae에 대한 MIC_(50), MIC_(90)가 모두 >500 ㎍/mL이었고, S. aureus와 P. aeruginosa에 대한 MIC_(50), MIC_(90)가 모두 500 ㎍/mL이었다. 결론 : 기관지 내시경 검사에서 흔히 쓰이는 lidocaine, thrombin, epinephrine 등의 약제들이 호흡기 질환의 흔한 병원균인 S. aureus, S. pneumoniae, K. pneumoniae, P. aeruginosa 균주들에 대해 항균 효과가 있을 수 있어 세균배양검사에 영향을 미칠 수 있겠다. Background : We performed this stody to find out about antimicrobial effect of lidocaine which is commonly used local anesthetic, and thrombin and epinephrine used for hemostasis during bronchoscopic procedures. Materials and Methods : The microorganisms that were cultured from specimens obtained during bronchoscopy were Staphylococcus aureus (n=42), Streptococcus pneumoniae (n=42), Klebsiella pneumoniae (n=42), and Pseudomonas aeruginosa (n=43) collected from St. Mary's Hospital, from March to Sep 2004 were used for susceptibity testing. Susceptibility to lidocaine, thrombin, and epinephrine were tested according to the National Committee for Clinical Laboratory Standards. Result : MIC_(50) and MIC_(90) of lidocaine for S. aureus, S. pneumoniae, P. aeruginosa were all 20,000 ㎍/mL and that for K. pneumoniae were 10,000 ㎍/mL. MIC_(50) and MIC_(90) of thrombin for both S. aureus and P. aeruginosa was 500 IU/mL and above 500 IU/mL, respectively; that for K. pneumoniae were all above 500 IU/mL and for S. pneumoniae they were 125 IU/mL, MIC_(50) and MIC_(90) of epinephrine for K. pneumoniae and S. pneumoniae were above 500 ㎍/mL; that for S. aureus and P. aeruginosa were 500 ㎍/mL. Conclusion : We observed possible antimicrobial effect of lidocaine, thrombin, and epinephrine in vitro against pathogens such as S. aureus, S. pneumoniae, K. pneumoniae, P. aeruginosa, which are common respiratory microorganisms. The use of these agants could affect the result of bacterial culture.

난치성 전두엽 간질의 외과적 치료

김정목,김형일,김근수,김철진,이정청,이민철 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.11

Recent advances of neuroimaging and electrophysiological monitoring technique have contributed in improving the surgical outcome of frontal lobe epilepsy. The authors have analysed 36 consecutive cases of intractable frontal lobe epilepsy that were treated at our institute between September. 1992 and December, 1995 to determine the clinical, electrophysiological, and neuroimaging characteristics as well as to delineate the efficacy of surgical treatment in improving the seizure outcome. The patients consisted of 19 males and 17 females. The mean age of the seizure onset and the mean duration of epilepsy were 14.9 and 11.6 years, respectively. Magnetic resonance imaging(MRI) showed no lesion in 9 patients and pathological lesions in 27 patients. The types of the lesions observed included primary brain tumor, mostly low-grade glioma in 10 patients, cortical dysplasia in 4, posttraumatic scar in 4, neocortical gliosis in 3, cyst in 3, and postencephalitic atrophy in 3. Intracranial recordings were performed in 23 cases to determine the epileptogenic zone. The surgical outcome was graded according to Engle’s Classification as Class A in 20 patients. Class B in 2, Class C in 9, and Class D in 5. The surgical outcome was promising regardless of the presence or the absence of the lesion on MRI, invasive recording, age of seizure onset, and duration of epilepsy.

클럽 샤프트(Club Shaft) 특성에 따른 골프 스윙(Golf Swing)동작 분석

김성일,김기형,김형수,이현섭,김진욱,안찬규,김희진 한국운동역학회 2002 한국운동역학회지 Vol.12 No.2

본 연구는 클럽 샤프트의 대표적인 재질인 그라파이트(graphite)의 유연한(flexible) 클럽 샤프트(club shaft)의 특성에 따라 피험자가 운동학적(kinematics) 요인이 되는 관절의 각변위, 각속도, 각가속도, 클럽헤드의 속도와 가속도와 같은 변인들이 어떻게 적응하는지 비교 분석하여 보다 효율적인 드라이버 선택에 도움을 주며 샤프트 특성에 따른 신체관절의 움직임에 대한 자료를 제시하고자 하였다. 고속 카메라 2대의 속도는 500fps로 하였고 각 regylar,stiff, x-stiff, 자신의 클럽을 포함 각 4개의 클럽을 사용하여 각 클럽당 3번씩 촬영하였으며 목표방향에서 20m이상 벗어나는 경우의 촬영은 다시 촬영하였다. 본 연구에서는 디지타이징(digitizing)을 신체 9개 마커는 강체로 가정된 클럽과 신체분절 모델로 정의하였으며 2 대의 카메라(500fps)로부터 얻은 avi화일을 컴퓨터에 저장하고 자료로부터 Butterworth 6th order recursive digital filter를 사용하여 1차 자료를 smoothing 하고 DLT를 이용하여 3차원 좌표를 구성하도록 한다. 좌표값을 얻기 위하여 kwon3d v3.0을 이용하였다. 본 실험은 피험자 스스로 클럽의 특성에 따라 스윙의 속도를 달리 하기 때문에 스윙의 시간이 달라지며 어느 정도 클럽이 강성에 따라 스윙시간이 빨라지는 결과로 나타났다. 이것은 피험자가 샤프트가 강성(stiffness)에 따라 스윙 속도를 빨리 하게 되는 원인이 되는 것으로 생각된다. 어깨의 각변위는 클럽이 regular의 경우 임팩트에서 각속도를 계속 유지하고 있으며 stiff, x-stiff의 경우에는 어깨의 움직임이 임팩트에서 급격하게 감소되는 것을 알 수 있다. 이것은 팔의 동작과 클럽의 힘을 크게 하기 위한 동작으로 생각된다. 어깨 각속도는 클럽이 stiff할수록 각속도가 큰 감속하는 것으로 나타났다. 손목속도는 regular 클럽의 경우 손목의 감속이 늦게 되고 임팩트에서 손목의 감속이 적게 하는 것으로 나타났으며 stiff와 x-stiff의 클럽에서 임팩트 시에 순간적인 감가속으로 인해 클럽의 속도를 증가시키고 있다. 임팩트 시에 손목의 감가속은 클럽헤드의 임팩트 시 속도를 증가시키는 결과를 보였다. 클럽헤드는 regular 클럽이 임팩트전에는 속도 증가가 커지는 결과와 일치된 결과를 보이고 있다. The purpose of this study was to find the rational method to analyze golf swing with specific property of club shaft. Three subjects were filmed by two high speed digital cameras with 500fps. The phase analyzed was downswing of each subject. The three-dimensional coordinates of the anatomical landmarks were obtained with motion analysis system Kwon3d 3.0 version and smoothed by lowpass digital filter with cutoff frequency 6Hz. From these data, kinematic and kinetic variables were calculated using Matlab(ver 5.0) The variables for this study were angular velocity and accelerations, which were calculated and following conclusions have been made : 1) Golf swing time of stiff club is faster than that of regular club. 2) In shoulder joint motion of swing with the stiff club, x-stiff showed mort rapid negative acceleration than that of regular club. 3) In regular club, the velocity of club head would be more effective velocity, which was increasing, than those of other clubs before impact. 4) In wrist joint motion of swing with stiff club, x-stiff club showed faster than regular club in the downswing and impact more rapid negative acceleration.

고해에 의한 섬유의 특성변화가 시트의 물리적 구조에 미치는 영향

김형진 國民大學校 山林科學硏究所 2003 山林科學 Vol.15 No.-

일반적으로 제지공정은 고해공정으로부터 시작된다는 기본 개념에서와 같이 펄프섬유의 고해 처리는 섬유자체의 형태학적 변화는 물론 시트의 물리, 화학적 특성을 결정짓는 중요한 인자가 된다. 따라서 제지현장에서는 지종이나 종이의 특성에 따라 펄프섬유를 구성하는 수종, 고해시의 리파이너 형태, 고해 농도 등의 고해 인자를 고려하고 있다. 본 논문에서는 고해 공정의 제반 인자 중 PFI mill을 이용하여 고해 정도의 변화를 야기한 후 펄프 섬유의 형태학적 변화 및 시트의 물리적 특성을 평가하고자 하였다. 또한 펄프의 형태에 따른 고해 거동을 상대 비교하여 평가하고자 하였다. 연구과정으로서 실험실에서 제조한 미건조 펄프섬유를 고해하여 소섬유화, 세포벽의 탈층 등의 고해 작용을 유도하였으며, 그 결과로서 펄프섬유의 여수도 및 WRV의 증가를 가져왔다. 또한 이에 따른 수초 시트의 투기도 및 인장 특성의 증가가 야기되었다. 고해에 의한 섬유 미세분의 생성은 여수도의 향상 효과는 있었지만 상대적으로 WRV 및 zero-span 인장강도에서는 낮은 값을 보였으며 수초 시트의 인장 특성의 저하를 야기하였다. Generally, it is well known refining is an essential process in papermaking operation. It is also one of the several factors in deciding the physical and chemical properties of paper. For the manufacture of targeted paper, paper mill should actually choose the optimum conditions of refining factor such as pulp types, refining consistency, refiner types and so on. In this study, the effect on morphological change of pulp fibres by refining and physical structure of paper were investigated using different degrees of refined pulp and two kinds of fibres. The evaluations of morphological change of fibres during refining and their resulting structure of paper were carried out by measuring several factors, wetness, WRV, zero-span tensile strength, air permeability and tensile behaviour. After refining, wetness and the water retention values were increased; air permeability and the tensile strength were also increased.

항공우주 구조물 건전성 모니터링 시스템의 최근 연구동향

김인걸,이홍영,김진원,이경아,김형임 충남대학교 산업기술연구소 2004 산업기술연구논문집 Vol.19 No.1

Descriptor 시스템 모델링 밍 극배치 제어기 설계

김정주,이준형,강진식 濟州大學校 産業技術硏究所 1999 산업기술연구소논문집 Vol.10 No.1

Many of the engineering systems such a s electrical circuits. communication networks. power systems, aerospace systems and singular systems can be modelled by a descriptor system which is similar to the state space representation of the system. In this paper, we present a control algorithm for the descriptor system by using eigenstructxe assignment. When the number of poles of the system changed due to the parameters variation, the system can be modelled by two subsystems a s the one is static system and the other is dynamic. And two systems are connected serially by the manner that the one system output is connected to the input of the other system. The controller presented in this paper, designed by eigenstructure assignment, can treats such a singular system easily. To show the suggested controller has a good feature, we apply the presenied controller to the inverted pendulum system.

고효율 충전탑에서 MEA 및 AMP 흡수제를 이용한 이산화탄소의 처리

김장호,김형호,강성진,김재홍,이경재 동아대학교 환경문제연구소 2003 硏究報告 Vol.25 No.2

In control technology of green house gas CO₂ exhausted, CO₂ recovery by chemical absorption technology is recommended. In application to a power station and industrial field with using the absorbent MEA and AMP for carbon dioxide removal. we used packing tower(D=0.l5m, H=1.05m) for experimental apparatus on the chemical absorbtion being used extensively as recovery technique of CO₂.

가교된 공중합 폴리이미드막에 의한 벤젠/싸이클로헥산 혼합액의 분리

김종환,이형록,김진환 한국공업화학회 2003 응용화학 Vol.7 No.1

Crosslinked copolyimide membranes containing both sulfony1 group(-SO_2) andtrifluoromethy1 group(-CF_3) which have high affinity for benzene, were prepared andthe pervaporation properties of these membranes were investigated for the separationof benzene/cyclohexane mixtures. Crosslinked copolyimide membranes were obtainedby a polycondensation of 6FDA with DDBT and DABA and a crosslinking withethylene glycol. Sorption and pervaporation experiments were performed at 323K,333K and 351K It has been found that all the crosslinked copolyimide membranes show high separation performances and good chemical and thermal stability.

비내시경을 이용한 안와 내벽 골절 정복 2예

김진국,남태욱,임채형,김재영,김정석 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

Traditional surgical approaches to orbital medial wall fractures are either extraocular skin incision or indirect bicoronal flap. However these methods can leave remarkable orbital scar or scalp alopecia with possible complications. Endoscopic intranasal visualization of the medial orbital wall and lamina papyracea is a technique familar to otolaryngologists. This endoscopic view allows confirmation of fracture of medial orbital wall and herniation of orbital contents. Good visualization of the fracture can facilitate the anatomic reduction of orbital contents and the proper placement of orbital implant. Two cases of medial orbital wall fracture repaired by intranasal endoscopy using silastic sheet are reported.