• 센서학회지
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• 제8권1호
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• pp.69-79
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• 1999

본 연구에서는 CCD 카메라 전용의 디지털 신호 처리기(DSP)를 이용하여 고해상도의 CCTV 카메라를 구현하였다. 기존의 아날로그 신호 처리기를 사용한 CCTV 카메라는 카메라의 기본 기능인 자동노출(AE), 자동백색조정(AWB), 역광보정(BLC) 등의 처리에 한계점을 갖고 있으며, 영상의 열화 현상이 심하고, 카메라를 생산하는 경우에 조정 매개변수를 수동으로 조정하여야 하는 등 여러 가지 문제점을 내포하고 있다. 따라서 본 연구에서는 이상의 문제점을 해결하기 위하여 국산의 CCD 카메라 전용의 디지털 신호 처리기를 사용하여, 이를 마이컴으로 제어함으로써 자동노출, 자동백색조정, 역광보정 둥의 처리를 화상의 질에 따라 자동으로 조절할 수 있도록 하였다. 또한 마이컴의 채택으로 화면에 문자를 표시하는 기능을 구현함으로써 사용자와의 대화적 형식의 카메라 제어가 가능하도록 구현하였으며, 생산 과정에서 수동으로 카메라 동작 매개 변수를 조정하여야 하는 문제점을 해결하기 위하여 전자적인 가변저항(EVR)을 채택하였다. 그 결과 카메라 조정 변수를 프로그램에 의해 조정하는 것이 가능해졌으며 파라미터 값의 재현성 및 조정 용이성 부분에서의 신뢰성과 조정시간의 감소로 인한 생산단가 절감의 효과를 가져올 수 있었다.

• 한국측량학회지
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• 제27권1호
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• pp.683-692
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• 2009

디지털 카메라를 이용한 지상형 원격탐사 기술은 농작물의 생육관리, 법면 녹화의 모니터링 및 환경 평가와 같은 식생평가분야에 유용한 기술로서 기대되고 있다. 본 논문에 서늘 일반적인 목적으로 판매되고 있는 디지털 카메라의 식생 평가분야에의 적용 가능성에 대하여 검토하였다. 그 결과, $\gamma$보정, 적정노출보정을 실시함으로써 시계열 관측 데이터간의 상면조도와 입사 에너지간의 관계를 분석할 수 있었다. 또한, 지상형 원격탐사에 있어서의 촬영 각도, 조도의 영향을 보정하기 위한 모델식을 제안하였다. 평가시험에서는 분광광도계와 디지털 카메라에 의해 구한 NDVI에는 높은 상관관계가 있음을 알 수 있었다.

• 한국환경보건학회지
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• 제44권5호
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• pp.409-420
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• 2018

Objectives: An outbreak of humidifier disinfectant-related respiratory disease has not only been a massive disaster for end users, but it is also a concern for the workers of the manufacturers. This study presents the results of a questionnaire survey on the health effects among workers involved in the manufacture of humidifier disinfectants. Methods: Seven sites where humidifier disinfectants were manufactured were identified. A questionnaire survey was conducted to assess the physical symptoms experienced by workers related to humidifier disinfectants. Among a total of 177 workers, 42 subjects were available for the survey. Results: Twenty-one of the 42 respondents reported that they experienced respiratory or skin and mucosal irritation symptoms during work. Of the respondents who experienced symptoms, 14 believed that their symptoms were related to the work process and reported that the symptoms were experienced while working. However, no respondents reported ongoing symptoms or sequelae during the investigation period, and this result could not minimize selection bias due to low response rates. We then compared the characteristics of the group who experienced suspicious symptoms with those of the group without any symptoms. There was no statistically significant difference between two groups. Conclusions: We could not find significant health effects related to the humidifier disinfectant manufacturing process, although 21 respondents experienced stimulant symptoms and 14 respondents believed that the symptoms were related to the work process. Due to the long period of time after occupational exposure and the lack of data, there were many limitations to this study. However, this is one of the few follow-up investigations of workers related to this large-scale disaster in South Korea and the limitations of this study highlight the need to follow up with a nationwide database rather than an occasional survey.

• 전자공학회논문지
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• 제53권12호
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• pp.120-127
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• 2016

디지털 x선 영상을 획득하기 위하여 최근에는 DR(digital radiography) 기술에 근거한 방사선 디텍터의 개발이 활발하게 진행되고 있다. 이러한 방사성 디텍터의 잡음 특성은, 균일한 노출에서 획득한 영상을 사용하여 NNPS(normalized noise power spectrum)를 측정하여 관찰한다. 이때 고정형태잡음(fixed pattern noise)을 제거하기위하여 두 장의 영상 차를 사용한다. 본 논문에서는 보다 정확한 NNPS를 측정하기 위하여, 먼저 여러 장의 영상을 획득하여 두 장의 평균영상을 구하고 그의 차를 사용하여 NNPS를 구하는 방법을 제안하였다. 이때 여러 장의 영상들의 평균으로 인하여 NNPS 값이 실제 값보다 작아지는데, 이러한 NNPS의 보정을 위하여, 평균할 때 사용한 영상 개수의 함수인 보정 상수도 함께 제안하였다. 또한 평균영상의 비를 사용하여 NNPS를 구하는 방법도 제안하였다. 실제 방사선 디텍터에서 획득한 영상을 사용하여 NNPS를 측정하는 실험을 통하여, 제안한 방법으로 NNPS 보다 정확하게 구할 수 있음을 관찰하였다.

• 대한불안의학회지
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• 제9권2호
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• pp.106-112
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• 2013

Objective : Several reports have found abnormal levels of androgen in post-traumatic stress disorder (PTSD) patients. This abnormality in androgen is hypothesized to due to chronic psychological stress effects on the hypothalamic-pituitary-gonadal (HPG) system. The present study was conducted to estimate serum testosterone levels in PTSD patients in comparison with normal subjects. Methods : Seventy-five male Korean veterans of the Vietnam War volunteered for the study, of which eleven were excluded because of incomplete psychological assessment. To measure basal serum testosterone, blood samples were collected between 8.00 and 9.30 a.m. The clinician administered PTSD scale (CAPS), the structured clinical interview for DSM-IV (SCID), Hamilton Anxiety Rating Scale (HAM-A), Hamilton Rating Scale for Depression (HAM-D), Mini International Neuropsychiatric Interview Plus (Korean version of MINI-Plus), CES-K (Korean version of combat exposure scale). Results : The serum testosterone level of PTSD patients ($5.4{\pm}2.5ng/mL$) was higher than that of a control group ($3.1{\pm}1.7ng/mL$, p<0.001). Testosterone levels were significantly correlated with CAPS (r=.38, p<.01), HAM-A (r=.35, p<.01) and HAM-D (r=.28, p<.01) in all subjects. Conclusion : The results of the present study suggest that chronic psychological stress affects the HPG system.

• 패션비즈니스
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• 제19권4호
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• pp.37-56
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• 2015

This thesis aimed to determine the effecting factors(eating pattern, working condition, stress, health care) that help maintain the health of the cosmetologists' digestive system and the diseases involved (acid reflux, indigestion, gastritis, constipation & diarrhea). The research methods included survey and statistical analysis. The survey was conducted on 242 cosmetologists from August 30 to October 30 2014. The data analysis included frequency, cross table, ${\chi}^2$-test, and regression with SPSS(V. 14). The results were as follows ; (1) The cosmetologists' health of digestive system and eating pattern are related. Regular and enough meal times cause less digestive disease. Acid reflux, indigestion, gastritis, constipation and diarrhea are differently related with the type of usual eating pattern, especially, instant food is not good for digestive health. (2) The cosmetologists' health of digestive system and working condition are related. Longer daily working hours and exposure time to chemical odors are more likely to be associated with digestive diseases; whereas, longer time of standing and talking with colleagues are less likely to be associated with digestive diseases. (3) The cosmetologists' health of digestive system and stress are related. Headache, boredom, conflict of pay and compensation, and insomnia are not good for digestive health. (4) The cosmetologists' health of digestive system and health care are related. Periodical medical examination and usual body stretching are correlated with digestive diseases; whereas, people who do regular exercise and bowel movement are less likely to have digestive diseases.

• Journal of Preventive Medicine and Public Health
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• 제34권1호
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• pp.35-40
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• 2001

Objectives : To elucidate the transient effects on the risk of occupational injuries as acute events and establish so alternative proposal. Methods : The study population comprised a total of 302 workers randomly selected from applications for occupational injury compensation reported to the Inchon local labor office from January 1. 1999 to December 31. A case-crossover design, where each case serves its own control, was applied to this study. Through a telephone interview, workers provided useful data concerning five job related stressful events such as company transfer, work load change, overtime work, exchange duty, and work-part transfer. They were asked whether there were stressful events within a week of the occurrence of injury and the degree of stress. Exposure status from one year prior was used as control information. In the end, the data provided by 158 of selected persons was used for the analysis based on the quality of the data provided by the participants. A conditional logistic regression was used to discover the transient effects on the risk of occupational injuries as acute events. Results : The effects a company transfer and work load change on occupational injury was statistically significant on the risk of occupational Injuries as an acute event(RR=5.5, 95% CI=2.501-12.428; RR=3.1, 95% CI=1.963-5.017, respectively). Other stressful events were found to elevate the risk factor for the occurrence of occupational jujury, but were not significant. Conclusions : Our results suggested that transient stressful events elevated the risk factor for the occurrence of occupational injury.

• Safety and Health at Work
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• 제9권1호
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• pp.75-78
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• 2018

Background: To identify work sectors with high risk for work-related musculoskeletal disorders (MSDs) in Korean men and women. Methods: We analyzed nationwide data to identify ergonomic risk factors in Korean employees. In particular, we analyzed data on exposure to five ergonomic risk factors (painful/tiring postures, lifting/moving heavy materials, standing/walking, repetitive hand/arm movements, and hand/arm vibration) according to employment sector, sex, and age, using the 2014 Fourth Korean Working Conditions Survey. We also used workers' compensation data on work-related MSDs in 2010, which is available by sex. Results: The different work sectors had different gender distributions. "Manufacturing" (27.7%) and "construction" (11.3%) were dominated by males, whereas "human health and social work activities" (12.4%), "hotel and restaurants" (11.7%), and "education" (10.4%) were dominated by females. However, "wholesale and retail trade" and "public administration and defense" employed large numbers of males and females. Furthermore, the work sectors with a greater proportion of work-related MSDs and with multiple ergonomic risk factors were different for men and women. For men, "construction" and "manufacturing" had the highest risk for work-related MSDs; for women, "hotel and restaurants" had the highest risk for work-related MSDs. Conclusion: Ergonomic interventions for workers should consider gender and should focus on work sectors with high risk for MSDs, with multiple ergonomic risk factors, and with the largest number of workers.

• Safety and Health at Work
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• 제5권4호
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• pp.234-237
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• 2014

Background: Inhalation of asbestos fibers can lead to adverse health effects on the lungs. This study describes lung function profiles among individuals with nonmalignant asbestos-related disorders (ARDs). Methods: The study population was from the Workers' Compensation (Dust Diseases) Board of New South Wales, Sydney, Australia. Lung function measurements were conducted in males with asbestosis (n = 26), diffuse pleural thickening (DPT; n = 129), asbestosis and DPT (n = 14), pleural plaques only (n = 160) and also apparently healthy individuals with a history of asbestos exposure (n = 248). Standardized spirometric and single-breath diffusing capacity for carbon monoxide ($DL_{CO}$) measurements were used. Results: Mean age [standard deviation (SD)] was 66.7 (10.3) years for all participants. Current and ex-smokers among all participants comprised about 9.0% and 54.8%, respectively. Median pack-years (SD) of smoking for ex- and current-smokers were 22.7 (19.9). Overall 222 participants (38.6%) and 139 participants (24.2%) had forced expiratory volume in 1 second ($FEV_1$) and forced vital capacity (FVC) measurements < 80% predicted, and 217 participants (37.7%) had $FEV_1/FVC$ results < 70%. A total of 249 individuals (43.8%) had DLCO values < 80% predicted and only 75 (13.2%) had DLCO/VA results < 80% predicted. A total of 147 participants (25.6%) had peak expiratory flow (PEF) measurements < 80% predicted. The presence of ARDs lowered the lung function measurements compared to those of healthy individuals exposed to asbestos. Conclusion: Lung function measurement differs in individuals with different ARDs. Monitoring of lung function among asbestos-exposed populations is a simple means of facilitating earlier interventions.

• 한국환경보건학회지
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• 제45권4호
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• pp.340-357
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• 2019

The purpose of this paper is to help develop a comprehensive understanding of the humidifier disinfectant disaster from diverse perspectives based on a critical review of the relevant academic research papers published so far in the fields of both natural and social science. The authors reviewed pertinent articles in the six academic areas of law, social science, humanities, medicine, toxicology, and environmental health. A proper understanding of the issue of humidifier disinfectant is a challenging task because diverse aspects of it have become related over the more than two decades since such products were first released to the market in 1994. Technical and esoteric issues such as the complex system for relief and compensation for health damages and the approval of chemical toxicity are known to be major impediments to viewing the bigger picture regarding this tragedy. The authors believe that experts need to consider a comprehensive perspective going beyond their individual research arena to gain a better understanding of this issue, especially since it was an alarm signal on ethics and the role of experts and scholars in Korean society. Besides the two professors arrested by the prosecutor's office, it should be remembered that medical doctors recommended patients use humidifiers and disinfectants, and the media was inactive in reporting on this issue. Furthermore, the current paucity of examination of the social and political implications of this tragedy calls for more active engagement by researchers in the humanities and social sciences. In this regard, this paper is a work of self-examination and self-criticism by the authors that could resonate with the overall academic community.