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.

제주도 고산에서 수용성 에어로졸의 화학적 성분 분석

장광미,이호근,강창희,허철구,박경윤,서명석 濟州大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.9 No.2

Atmospheric aerosols were collected by a High Volume Tape Sampler from March 1992 to December 1993 at Kosan, Cheju, korea. The water soluble ion concentrations in aerosol were analyzed. The concentrations of cations(Na+, K+, Ca²+, Mg²+, NH₄+) were determined by an Inductively Coupled Plazma(ICP) or an Atomic Absorption Spectrometer(AAS), and those of anions(Cl-, NO₃-, SO₄²-) were analayzed by the capillary electrophoresis method. The Ca²+, SO₄²-and NO₃- concentrations in spring were higher than those in other seasons. The lowest concentrations of these elements were found in summer, largely due to scavenging by frequent rains. Especially the ca²+ concentration on April was three to four times higher than the annual mean concentration. The enrichment factor(E.F.) of each element was calculated. The annual mean E.F. values of the Ca²+, Mg²+ and Cl- in 1992 were the same as those in 1993 except K+ and SO₄²-. The correlation formula between all cations and anions for the whole period was Anions=0.759xCations+0.066.

청정지역과 도시지역의 오존농도 특성 연구

장광미,강창희,서명석,허철구,박경윤,이호근,김영준 濟州大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.9 No.2

A study has been performed on the characteristics of rural and urban surface ozone concentration for the period of March 1992 to February 1993. The monitoring station of rural ozone is located at Kosan, Cheju and other urban monitoring stations are located at Seoul, Pusan and Kwangju. Rural's and urban's ozone data exhibit a distinct features in many ways. First, annual mean of rural ozone concentration is very high(42 ppbv) but urban's are very low(10~15 ppbv). Second, rural ozone data shows a seasonal variation with it's maximum in spring, and minimum in summer, but urban's show a seasonal variation with it's maximum in spring, and minimum in winter. Third, diurnal variation of rural data is very small but that of urban's are very large. Fourth, monthly mean of daily minimum of rural data is not low and shows a large seasonal variation, but those of urban's data are extremely low(<3 ppbv) and have no seasonal variations.

복어중독에 의한 가사 상태에서 소생한 1예

송승찬,신진호,강석우,박경남,최호순,박근태,문희식,기춘석,이성희,윤병철,노우균,조균석,이민호 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.3

Tetrodotoxin is a neurotoxin produced by about 90 species of puffer fish and causes paralysis of central nervous system and peripheral nerves by blocking the movement of all monovalent cation. Ingestion of tetrodotoxin produces clinical manifestations such as paresthesias(within 10-45 min), vomiting, lightheadedness, salivation, muscle twitching, dysphagia, difficulty in speaking, convulsion and death that expressed by cardiopulmonary arrest with loss of brain stem reflex sometimes. Tetrodotoxin prevents or delays ischemia induced neuronal death by way of following 3 mechanisms. Firstly, it reduces the energy demand of the brain tissues. Secondly, it delays or even prevents anoxic depolarization. Finally, it deminishes ischemia induced cell swelling and cerebral edema. We report a case of puffer fish poisoning which presented with cardiopulmonary arrest and loss of brain stem reflex, but completely recovered by aggressive cardiopulmonary resuscitation.

피로와 의료이용, 업무상 사고 및 질병결근

장세진,고상백,강동묵,김성아,정진주,이철갑,강명근,현숙정,조정진,차봉석,박종구 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Objectives: This study examined the relationship of fatigue to medical utilization, occupational accident and sickness absence. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project, 2002~2004). A total of 30,146 employees categorized within the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were recruited. A structured-questionnaire was used to assess the participants' sociodemo-graphics, job-related factors, health-related behaviors, personality trait, self=perceived fatigue (MFS) and the frequency of medical utilization, occupational accident and sickness absence. Data on medical utilization and occupational accident were confirmed from company health records. Chi-square test and logistic regression analysis were used to elucidate the relationship of self-perceived fatigue to medical utilization, occupational accident and sickness absence. Results: In logistic regression analyses, self-perceived fatigue was associated with medical utilization (outpatient), occupational accident and sickness absence although the strength of the associations was higher in the blue collar workers except for medical utilization. For medical utilization, the white collar worker's adjusted odds ratios of outpatient utilization for workers scoring in the third quartile and the highest quartile, compared to workers scoring in the lowest quartile were 1.50 (95% CI: 1.20-1.87) and 2.16 (95% CI: 1.69-2.75), respectively. The blue collar workers' adjusted odds ratios of outpatient utilization for workers scoring in the second (OR: 1.23, 95% CI: 1.06-1.43), third (OR: 1.42, 95% CI: 1.22-1.66) and highest quartile (OR:1.83, 95% CI: 1.55-2.17), respectively, compared to workers scoring in the lowest quartile were statistically significant. However, no associations were found between fatigue and inpatient utilization for either the white or blue collar workers. The blue collar workers' adjusted odds ratios of being injured for workers scoring in the second, third and highest quartile were 1.41 (95% CI: 1.00-2.00), 1.57 (95% CI: 1.10-2.22) and 2.41 (95% CI: 1.69-3.44), respectively, compared to those scoring in the lowest quartile, but, those of the white collar workers were not significant. There was more likely to an increased risk of sickness absence in workers scoring in the second, third and highest quartile compared to those scoring in the lowest quartile in both white and blue collar workers, but the magnitudes of risk were higher in the blue collar workers than the white collars workers. Conclusion: This result suggests that fatigue is a determinant predictor of medical utilization, occupational accident and sickness absence, and that the pattern of risks for the three outcomes differs according to the occupational type. Some limitations of this study and considerations for future study were also discussed.

Phytosociological Community Classification of Mountain Ridge from Guryongryeong to Mt. Yaksu in the Baekdudaegan, Korea

An, Hyun-Chul,Choo, Gab-Chul,Park, Sam-Bong,Cho, Hyun-Seo,An, Jong-Bin,Park, Jeong-Geun,Ha, Hyoun Woo,Kim, Jin Joong,Kim, Bong-Gyu 한국환경생태학회 2014 한국환경생태학회지 Vol.28 No.6

백두대간 구룡령-약수산 마루금에 22개의 방형구(100m2)를 설정하여 식생을 조사하였다. 식생군집을 분석한 결과 신갈나무-까치박달나무-당단풍나무군집, 신갈나무군집, 층층나무-신갈나무군집 등 3개의 군집으로 분류되었다. 백두대간 구룡령-약수산 마루금은 대부분 신갈나무가 우점하고 있었으며, 일부지역에서 까치박달나무와 층층나무 등이 혼효하고 있었다. 수종간의 상관관계에서 신갈나무와 노린재나무, 철쭉; 피나무와 찰피나무, 노린재나무; 찰피나무와 노린재나무, 철쭉; 거제수나무와 고로쇠나무; 노린재나무와 철쭉 등의 수종 간에는 높은 정의 상관이 인정되었다. 당단풍나무와 노린재나무, 철쭉 등의 수종 간에는 높은 부의 상관이 인정되었다. 조사지의 군집별 종다양성 지수는 0.8170~1.1446범위로 백두대간에 위치한 국립공원들의 능선부 식생구조 보다는 약간 낮게 나타났다. To investigate the vegetation structure of mountain ridge from Guryongryeong to Mt. Yaksu, 22 plots (100m2) installed with random sampling method were surveyed. Three groups of Quercus mongolica-Acer pseudosieboldianum community, Q. mongolica community, Cornus controversa-Q. mongolica community were classified by cluster analysis. Q. mongolica was a major woody plant species in the ridge area from Guryongryeong to Yaksusan and Carpinus cordata and C. controversa was partly occupied in some area. High positive correlations showed between Q. mongolica and Symplocos chinensis for. pilosa, Rhododendron schlippenbachii; Tilia amurensis and Tilia mandshurica, Symplocos chinensis for. pilosa; Tilia mandshurica and S. chinensis for. pilosa, R. schlippenbachii; Betula costata and Acer mono; Symplocos chinensis for. pilosa and Rhododendron schlippenbachii, and relatively high negative correlations showed between A. pseudosieboldianum and S. chinensis for. pilosa, R. schlippenbachii. Species diversity(H') of investigated groups were ranged 0.8170~1.1446 and it was lower compared to those of the ridge area of the national parks in Baekdudaegan.

A New Forage Barley Cultivar with Semi-Smooth Awn and High Yielding ‘Miho’

Young-Jin Oh,Tae-Il Park,Hyoung-Ho Park,Ouk-Kyu Han,Jong-Chul Park,Tae-Hwa Song,Yang-Kil Kim,Hyeon-Jung Kang,Jae-Seong Choi,Yun-Woo Jang,Kwang-Geun Park,Jong-Ho Park,Chon-Sik Kang,Young-Keun Cheong,Ky 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07

The purpose of development new variety ‘Miho’ (Hordeum vulgare L.) is a favorite with livestock feed and develop varieties resistant to disease and lodging. ‘Miho’ was carrying the growth habit of group Ⅲ, green and mid-wide leaf. Awn that are related to preference of livestock is a semi-smooth awn. This cultivar had 96cm of culm length, 650 of spikes per m2. Heading date of ‘Miho’ is April 27, and maturing dates on May 30, which were later than cultivar ‘Youngyang’. It also showed strong winter hardiness, and similar resistance to shattering and BaYMV compared with those of check one. The best thing among the traits of one is a new good quality with the plant green at the latter growing period. The average forage dry matter yield in the regional yield trial was about 13.1, 12.1 MT per ha in upland and paddy field, respectively, which were 9%, 2% higher than that of the check cultivar. It’s also showed 6.8% crude protein, 27.1% ADF (acid detergent fiber), and 67.5% TDN (Total Digestible Nutrients), including higher silage quality for whole crop barley. This cultivar would be suitable for the area whose daily minimum temperature was above -8℃ in January in Korean peninsula.

Fluid Flow Analysis of the Threshold based Leaky Bucket Scheme

Chul Geun Park 한국정보과학회 1998 Journal of Electrical Engineering and Information Vol.3 No.2

We investigate a Leaky Bucket(LB) scheme with a threshold in the data buffer, where leaky rate changes depending on the contents of data buffer. We use the fluid flow model for the analysis of the LB scheme with a threshold. We model the bursty input source as Markov modulated fluid flow(MMFF). As performance measures we obtain loss probability and mean delay. We present some numerical results to show the effects of the level of a threshold, the rate of token generation, the size of token pool, and the size of data buffer on the performances of the LB scheme with a threshold.

Delay Analysis of DBA Scheme in a Gigabit PON

Chul Geun Park,Ho Chul Park,Dong Hwan Han 한국멀티미디어학회 2008 한국멀티미디어학회 국제학술대회 Vol.2008 No.-

GPON(Gigabit Passive Optical Network) is a typical subscriber access network technology which adopts the DBA (Dynamic bandwidth Allocation) scheme in order to transmit upstream traffic efficiently. In this paper, we introduce the gated polling system with a two-stage queue in order to analyze the packet delay of the DBA scheme in a GPON. We use a continuous time queuing model for deriving the mean cycle time and for obtaining the mean packet delay. We get some numerical results to show the delay performance for the symmetric polling system with statistically identical stations.

Effect of Annealing Temperature on Morphology, Defect States, and Photocatalytic Performance of ZnO Nanorods

Park, Geun Chul,Lee, Chang Min,Lim, Jun Hyung,Joo, Jinho American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.11