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.

태양돛 기술 동향

조형순(Hyeong-Sun Cho),김학인(Hak-In Kim),이수용(Soo-Yong Lee),노진호(Jin-Ho Roh) 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.6

태양돛은 태양 광자들의 운동량 변화를 이용하여 추력을 얻는 우주선이다. 매우 작지만 연속적인 가속도를 얻을 수 있어 태양돛은 다양한 임무를 수행할 수 있다. 효과적인 임무 개발을 위해서는 태양돛의 형상, 돛의 재료 그리고 전개 장치에 따른 구조/재료적 특성뿐만 아니라 위성의 임무 궤적에 따른 자세제어 방법들을 고려해야 한다. 본 논문에서는 태양돛의 기술발전, 태양돛 제작에 필요한 소요기술 그리고 태양돛을 이용한 향후 개발 가능한 위성 임무에 대하여 살펴보고자 한다. Solar sail spacecrafts can gain propulsion using the momentum change through reflecting the photon packets of energy from the Sun. The sail slowly but continuously accelerates to accomplish a wide-range of potential missions. To develop the potential mission of the solar sail, the configuration, the film characteristics and the deployment devices should be carefully considered. In this paper, recent development and activities of the solar sail are introduced and design technology of the sail subsystem is investigated.

백서 대장암의 동종면역효과에 관한 연구 : Effect of Cancer Bearing Rat Serum

김형일,박애자,장선택 중앙대학교 의과대학 의과학연구소 1988 中央醫大誌 Vol.13 No.2

In recent years, there has been much interests in identification and characterization of numerous tumor relating substances including ectopic hormones, oncofetal antigens, or abnormal enzymes for the diagnosis and monitoring of malignant tumors. But, practically so called cancer antigen, such as AFP, CEA, or TPA, which has been never used toward manufacturing anti-cancer antibody, while only used to compete the cancer tissue type specificity. Nowadays, cancer antigen must be actually applied in the field of cancer treatment by means of the mediator or inducer for anti-cancer antibody formation. This study researched the alloimmunization effect of the serum components obtained from cancer developing animals, chemical carcinogen (NG: N-methyl-N'-nitroso-N-nitrosoguanidine) induced colon adenocarcinoma model, in 216 male rats, and gained following results: 1. In cancer producing rats, the CRP levels were maintained evenly high values althrough the experimental period, but serum TPA was gradually increased along sequential studies, while βCG and LDH were increased in early acute phase and sooner decreased in late phase. 2. The individuals, those were alloimmunized by the serum acquired from cancer bearing rats, represented significantly high cancer rejection rate, especially in the group which was infused the serum of conspicuously high TPA concentration. 3. In the long survivers and cancer resistance group, could observed neither high βCG level nor increased LDH value, however the early deaths revealed extremely higher βCG and LDH levels in contrast of relatively lower TPA concentration. 4. So, there was able to confirm the fact that not only cancer rejection antigenicity was presented in the serum of cancer developing individuals, but also could gained prominent allommunization effect utilizing such serum of high occurring TPA believing one of immunologic cancer rejectives by itself or mediation of antibody inducing effects.

유한요소법을 위한 초기요소망 구성에 관한 연구

김형석,최관순 순천향대학교 1993 논문집 Vol.16 No.3

This paper describes a method for mesh generation of arbitrary polyhedra. This method is based on Delanuay's triangulation whose dual is well-known Vornoi's diagram. Firstly, this algorithm divides analysis model into a finite set of elements using minimum input data for depicting its boundary shape. And interior node placement can being using a proposed strategy . Finally, the connectivities are fixed and the nodes are repositioned to produce elements with somewhat improved shapes. The technique we use is called Laplacian smoothing.

지도영상으로부터 심볼 추출과 인식

김형석,최관순 순천향대학교 1991 논문집 Vol.14 No.3

In Geographic Mapping system, Facility administration is going to be computerized for secure and efficient maintenance, and it is needed to input many already existing geographic map into computer system. Then it is required to extract symbols and recognition them. Thus we developed an automatic symbol extraction and recognition system for geographic map. which enabled to input such map, at recognition rate over 85%.

응급실 심정지 환자의 심폐소생술시 순환 회복률에 관한연구

김선표,조남수,조수형 朝鮮大學校 附設 醫學硏究所 2004 The Medical Journal of Chosun University Vol.29 No.3

Background and Objectives: There has been an increase in the number of cardiac arrests due to increase in both cardiovascular diseases and the average age of the population. This study was designed to improve the result of CPR(cardiopulmonary resuscitation) by comparing and studying the outcomes of cardiac arrest. Materials and Method: We reviewed the charts of 283 patients whom CPR was performed of CPR performed in emergency department of Chosun University Hospital during the period from April 2001 to March 2004. Results: During the period, CPR were performed to 283 cardiac arrest patients. Initial ECG(Electrocardiogram) rhythm showed VF/VT(ventricular fibrillation/ventricular tachycardia) in 34 (12%) patients, PEA(pulseless electrical activity) in 99 (35%) patients and asystole in 150 (53%) patients. The precipitating causes of cardiac arrest were cardiogenic origin 20 (15.9%), non cardiogenic 164 (58%) and traumatic 55 (26.1%). 109 (38%) patients recovered the ROSC (restoration of spontaneous circulation) at least once and 7 (2.5%) patients discharged alive. Conclusion: The survival rate of patients with cardiac arrest has not changed much compared to the past. Positive predictive factor for ROSC is VF/VT as initial ECG rhythm. Negative predictive factor for ROSC is traumatic etiology.

고압 분사노즐의 최적형상에 관한 연구

이종선,김형철 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.2

This study makes to flow analysis of computational fluid dynamics(CFD) according to the basic theory of turbulent flow regarding high-pressure injection nozzle. It also makes structural analysis to find out the structural validity of the optimum shape of high-pressure injection nozzle. It divides to two areas such as plunger area and high-pressure injection nozzle area including plunger.

젊은 성인 남자의 흡연과 혈청 지질과의 관련성

조선,류소연,박종,강명근,김은숙,김형철,박광희,윤혜은,노희송 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2

Objectives: This study was performed to find the association of cigarette smoking and blood lipid profiles in healthy young adults. Methods: The data was collected by a self-administered questionnaire and health examination in 489 professional soldiers from 6 to 12 May, 2004. The status of cigarette smoking was classified by non-smoking, ex-smoked, ≤4.9, 5-9.9, and ≥10 pack-years. The statistical analysis were used by chi-square test, analysis of variance and analysis of covariates. Results: In status of subjects cigarette smoking, current smoking, ex-smoked, and non-smoking were 71.8%, 11.2%, and 17.0%, respectively, In distribution by amount of smoking, non-smoking, ex-smoked, ≤4.9 pack-years, 5-9.9 pack-years, and ≥10 pack-years were 17.0%, 11.2%, 37.4%, 21.3%, and 13.1%, respectively. At other confounding variables were controlled, total cholesterol and LDL-cholesterol were increased significantly when amount of smoking was increased. However, triglyceride and HDL-cholesterol did not showed statistically significant differences, Conclusion: Smoking has relevant to total cholesterol and LDL-cholesterol and it is need to perform the further study for finding how blood lipid profiles are affected its level by cigarette smoking and to find an influence of cigarette smoking on cardiovascular disease.

牧楡湯이 人體 肺癌細胞의 變化에 미치는 影響에 關한 分子生物學的 硏究

李炯周,金相贊,徐富一,金先熙,卞晟僖 대한본초학회 1999 大韓本草學會誌 Vol.14 No.1

This experimental study was performed to investigate the effects of Mokyou-Tang on cell cycle and gene expressions of human lung cancer cell. I examined the cell cycle progression and cell cycle-related gene expression in A549 using a flow cytometry and a quantitative PT-PCR analysis. The treatment groups, in accordance with concentration of Mokyou-Tang were classified as 3 group(MYT 100㎕/㎖, MYT 500㎕/㎖, MYT 1,000㎕/㎖), and according to treatment time, were classified as 2 group(24hours, 48hours). The results were summarized as follows; 1. In cell cycle stage, MYT 100㎕/㎖(48hours) and 1000㎕/㎖(48hours) groups were increased as compared with control group, especially 1000㎕/㎖(48hours) group showed eminent increase. 2. In p53 gene, MYT 500㎕/㎖(48hours) and 1000㎕/㎖(48hours) groups showed eminent suppressive effect to cancer cell. 4. CDKNI gene was decreased in all treatment groups, this mean that MYT has suppressive effect to proliferation of cancer cell. 4. In GADD45 gene was decreased in all treatment groups, this mean that MYT has suppressive effect to proliferation of cancer cell. The results suggest that MYT promotes G1 cell cycle arrest and suppresses the proliferation of cancer cell. Thus, it seems likely that MYT has suppressive effect to proliferation of lung cancer cell.

P2P 기반 Mobile System 구현

황인선,이호현,전병균,김형균 광주보건대학 2004 論文集 Vol.29 No.-

P2P network environments provide mobile users with direct data transmission and sharingfacilities and those environments can be classified into hybrid P2P network environments and pure P2P network environments according to the arbitration mechanism among the peers in the network. In pure P2P network environments, however, each peer directly connects to another peer and gets services without server intervention, and so, network isolation can occur when the mediating peer fails to work. In this paper, we propose a scheme for each peer to keep connection to other peers continuously by maintaining IP addresses of its neighbor peers and connecting to the peers when the mediating peer fails to work. Although the P2P application that uses our proposed framework should obtain one or more IP addresses of the neighbor peers manually, after instantiation, the application can do its job while maintaining connection to the network continuously and automatically. In order to improve these weaknesses, we introduce LBS(Location Based Service) and mobile P2P(Peer to Peer)service into the existing systems, then design and implement the enhanced system for mobile SFA using them. Through this improvement, our system makes it possible for customers or sales agents to quickly share various information and increases the efficiency of sales activity by facilitating the competition and cooperation among sales agents and reducing time-cost.