• 대한수의학회지
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• 제44권4호
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• pp.587-591
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• 2004

Blood samples from 622 pigs of 44 farms which were sero-positive to Mycoplasma hyopneumoniae (M. hyo) by ELISA method were collected from May 2003 to July 2004. And they were divided into 2 categories : M. hyo-vaccinated group (7 swine farms) and M. hyo-non-vaccinated group (37 swine farms). Then, each swine farm was analysed by sero-positive percentage per weeks of age. It was observed that the sero-positive percentage to M. hyo is directly proportional to weeks of age in the 44 swine farms that were selected. This meant that there has been a chronic infection of M. hyo in Korean swine herds and control of M. hyo infection did not have worked efficiently. In 7 M. hyo-vaccinated swine farms, there were no reliable patterns between sero-positive percentage to M. hyo and weeks of age. Although the swine farms have been used M. hyo vaccine, they had only little sero-positive percentage that was less than 50% at 6 to 11 weeks of age. This means a present vaccination program does not induce sufficiently a seroconversion expected. In 37 M. hyo-non-vaccinated swine farms, it was observed that sero-positive percentage was higher at above 15 weeks of age. This result showed that infection of M. hyo occurred commonly at between 7 and 12 weeks of age, at which pigs moved to the growing house. Because a risk of natural infection is severe at growing stage as well as nursery stage, it suggested that M. hyo vaccination at several weeks prior to the growing stage will give efficient effect to control the enzootic pneumonia.

• 한국화재소방학회논문지
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• 제31권5호
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• pp.107-116
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• 2017

터널화재는 국제적인 관심사이며, 매년 중대 터널화재는 발생하고 있다. 교통밀도가 증가하면서 장대터널은 물론, 더 많은 수의 터널이 건설되고 있어서, 앞으로 터널화재의 잠재위험성이 더 나빠질 수 있으므로 더욱더 심각한 문제이다. 도로터널 화재발생시 소방대원이 효과적인 소방활동 전략을 수립하도록 하는 것이 본 연구의 궁극적 목적이다. 과거 화재 사례로부터 어떠한 사고가 발생하였고, 어떠한 소방활동이 행해졌는지 알아보기 위하여 국내외 73건의 터널화재사고사례를 조사하여 4가지 사고유형으로 분류하였다. 소방활동의 전략수립을 위해 개입시간과 열방출율의 관계로 6가지 화재시나리오 곡선을 도출하였다. 이것은 두 가지 기준 즉, 반응한계와 최대 도착시간에 따라 소방활동의 전략을 수비적, 공격적 전략 중 선택할 수 있도록 하였다. 도로터널 분류 모델은 각 소방기관이 관할 터널의 화재 위험 정도를 화재 진압의 관점에서 평가하고 예방조치를 수립하는데 사용될 수 있다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2016년도 학술발표회
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• pp.197-197
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• 2016

Forecasting future drought events in a region plays a major role in water management and risk assessment of drought occurrences. The creeping characteristics of drought make it possible to mitigate drought's effects with accurate forecasting models. Drought forecasts are inevitably plagued by uncertainties, making it necessary to derive forecasts in a probabilistic framework. In this study, a new probabilistic scheme is proposed to forecast droughts, in which a discrete-time finite state-space hidden Markov model (HMM) is used aggregated with the Representative Concentration Pathway 8.5 (RCP) precipitation projection (HMM-RCP). The 3-month standardized precipitation index (SPI) is employed to assess the drought severity over the selected five stations in South Kore. A reversible jump Markov chain Monte Carlo algorithm is used for inference on the model parameters which includes several hidden states and the state specific parameters. We perform an RCP precipitation projection transformed SPI (RCP-SPI) weight-corrected post-processing for the HMM-based drought forecasting to derive a probabilistic forecast that considers uncertainties. Results showed that the HMM-RCP forecast mean values, as measured by forecasting skill scores, are much more accurate than those from conventional models and a climatology reference model at various lead times over the study sites. In addition, the probabilistic forecast verification technique, which includes the ranked probability skill score and the relative operating characteristic, is performed on the proposed model to check the performance. It is found that the HMM-RCP provides a probabilistic forecast with satisfactory evaluation for different drought severity categories, even with a long lead time. The overall results indicate that the proposed HMM-RCP shows a powerful skill for probabilistic drought forecasting.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제27권3호
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• pp.51-60
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• 2021

Purpose: The purpose of this study is to derive the residential environment design elements that affect suicide, and then analyze the actual situation in terms of suicide prevention and suggest implications. Methods: The study was conducted through literature analysis, field surveys, and interviews with stakeholders. Results: As a result of extracting the variables related to the residential environment that affect suicide suggested in a total of 18 papers, 15 variables were extracted and organized into major categories such as housing type, health and welfare facilities, leisure and cultural facilities, and living environment. Next, we selected a public rental housing complex with a relatively high suicide rate among multi-family housing as the case, and conducted a empirical analysis. It was investigated that the facilities were insufficient, and apart from the quantitative satisfaction of the rest, various problems were exposed, such as the classification of users according to age and insufficient management in terms of the actual use of residents including suicide attempters. Implications: First, it is necessary to search for the design direction of the residential environment for suicide prevention. Second, it is necessary to find a way to solve the exclusion phenomenon that appears in space and programs. Third, when planning a space for suicide prevention, understanding of the behavior of high-risk groups should be reflected.

• Safety and Health at Work
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• 제12권3호
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• pp.311-316
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• 2021

Background: The present study investigated the association between two domains of physical activity (occupational physical activity [OPA] and leisure-time physical activity [LTPA]) and sleep duration. Methods: We investigated 3,421 paid workers from the Korea National Health and Nutrition Examination Survey, 2014-2015. Sleep duration was categorized into three categories (short for less than 5 h, optimal for 5-9 h, and long for more than 9 h). OPA and LTPA were defined in terms of answers to relevant questions. Odds ratios were calculated for sleep duration according to each physical activity domain using multinomial logistic regression models. Results: There were 464 subjects (13.6%) who showed short sleep duration, and 169 subjects (4.9%) who showed long sleep duration. Prevalence of OPA and LTPA was higher in male workers than in female workers (for OPA: 3.67% and 1.76%, respectively, p = 0.0108; for LTPA: 16.14% and 6.07%, respectively, p < 0.0001). The odds ratio of OPA for long sleep duration in female workers was 3.35 (95% confidence interval, 1.37-8.21). Otherwise, LTPA was not associated with sleep duration in female paid workers, nor both physical activity domains in male paid workers. Conclusion: Female paid workers with work-related physical activity were at risk of oversleeping. These findings also suggested that physical activity has distinct associations with sleep duration according to the physical activity domains and sex.

• Safety and Health at Work
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• 제12권4호
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• pp.479-489
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• 2021

Background: During 2011, a study was undertaken to assess safety conditions in Serbian underground coalmines by analysis of injury data. The study covered all Serbian coalmines, identified week spots from the aspect of safety, and recommended possible courses of action. Since then, Serbia has made changes to safety and health legislation; all coalmines introduced new preventive measures, adopted international standards, and made procedures for risk management. After 10 years a new study has been performed to analyze the impact of these changes. Materials and methods: In this study, the injuries that have occurred in the Serbian underground coal mines over the last 20 years were analyzed. Statistical data analysis was performed by IBM SPSS Statistics v23. The injuries that occurred in the last ten years were compared with the results of the previous study (2000-2009). The average values of injury rates for both periods were compared for each of the categories (severity, age, body part, qualification), and the results were presented as absolute difference or percentile difference. Results: The results showed reduction in the number of injuries in the category of 20-30 years old workers, where the new training procedures for workers, which were set by mandatory legal regulations, certainly contributed. They also showed an increase in the number of injuries in the category of old workers, which indicates that the law did not have a positive effect on this category. Conclusion: The total number of injuries is still high; therefore, it is necessary to introduce mechanization and automation in mines and have a better policy for older workers who retire later nowadays.

• 한국융합학회논문지
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• 제10권8호
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• pp.21-26
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• 2019

본 논문은 C4.5 알고리즘을 이용한 피로 인식 방법을 제안한다. 피로 평가에 대한 국내외 연구를 바탕으로 중국인의 생활습관 및 문화적 특성과 결합하여 피로 자기평가 척도를 완성하였다. 본문에서 사용한 척도는 58개 하위항목에 적용되어 있으며 피로의 유형과 정도를 평가하는 데 사용되었다. 이 항목들은 육체적 피로, 정신적 피로, 개인의 습관 및 피로의 결과 등을 측정하는 4가지 분류 항목에 포함된다. 본 연구의 목적은 피로 형성의 주요 원인을 분석하고 그에 따른 피로 정도를 인식함으로써 피로에 대한 주관적 관심을 증가시키고 과도한 피로로 인한 심뇌혈관계 질환의 위험을 감소시키는 데 있다. C4.5 알고리즘을 활용한 피로 인식 시스템의 인식률은 평균 85%로 나타나 본 제안의 유용성을 확인하였다.

• 융합정보논문지
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• 제9권3호
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• pp.44-55
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• 2019

본 연구의 목적은 남자 대학생들의 스포츠토토 도박을 통해 겪게 되는 경험과 그들이 당면하고 있는 문제를 파악하여 남자 대학생 도박중독의 예방 및 회복 프로그램에 기초자료를 제공하고자 시도하였다. 본연구의 참여자들은 8명의 남자 대학생으로 심층 인터뷰 한 자료를 Colaizzi의 현상학적 연구방법에 따라 분석하였다. 연구결과 경험의 범주는 4개로 바다로 달려가는 바람처럼, 회한으로 흐르는 눈물, 수면 아래로 잠긴 삶, 꿈을 꾸는 날엔 으로 도출되었다. 본 연구를 통해 스포츠토토는 접근성이 용이하고 흥미 유발적인 요소가 많지만, 일반 도박자들과 마찬가지로 자기 통제력을 상실한 채 중독에 빠질 위험이 크다는 것이 드러났다. 그렇지만 도박 기간이 짧은 대학생이 경제적 자금 조달의 한계점으로 현실을 자각할 경우 도박중독 위험으로부터 비교적 빠르게 격리될 수 있다고 본다. 따라서 스포츠를 좋아하는 대학생들을 위한 도박 예방교육과 상담이 필요할 것으로 생각된다.

• 한국환경보건학회지
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• 제45권2호
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• pp.173-185
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• 2019

Objectives: The objectives of this study are to evaluate the accuracy and precision of exposure model ECETOC TRA v.3.1 by comparing model predictions with repeated exposure measurements in Korean workplaces and to investigate the applicability of ECETOC TRA to Korean workplace exposure assessment in K-REACH. Methods: Measured values and work conditions for 14 kinds of chemicals collected from exposure field surveys conducted at 10 companies in Korea were utilized for this study. All possible process categories (PROCs) considered to be relevant to each work process classification were selected and applied to ECETOC TRA as major determining parameters. In order to quantify the accuracy of the model, the lack of agreement (bias, relative bias, precision) was calculated and the risk ratios for each exposure situation between estimated and measured were also compared. Results: The estimated values varied between five and 25 times according to the PROCs for all exposure situations (ESs) based on tasks/chemicals. The results showed that most of the estimated values were below the measured values, and just 13 of 53 tasks were above the measured values. The overall bias and precision were $-2.91{\pm}1.62$ with ECETOC TRA, and we found that ECETOC TRA showed a low level of conservatism when applied to Korean workplaces, similar to previous studies. Conclusions: This study demonstrates that the existed PROC codes have limitations in fully covering various ESs in Korea. In order to improve the applicability of ECETOC TRA in K-REACH, the addition of new PROCs for Korean industries are necessary.

• Parasites, Hosts and Diseases
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• 제56권6호
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• pp.589-596
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• 2018

Ticks are the vectors of various pathogens, threatening human health and animal production across the globe. Here, for the first time we detected Ricketssia spp., Borrelia spp. and protozoan in ticks from Poyang Lake region in Jiangxi Province of eastern China. In 3 habitat categories and on 12 host species, 311 ticks from 11 species were collected. Haemaphysalis longicornis was the predominant species, accounting for 55.63%, followed by Rhipicephalus microplus, Haemaphysalis flava and Ixodes granulatus. Of the collected ticks, 7.07% were positive for tick-borne pathogens, and H. longicornis and H. flava were found to be co-infected with Ricketssia spp. and protozoan. H. flava was the most detected positive for tick-borne pathogens, whereas H. longicornis had the lowest infection rate, and the difference in infection rates between tick species was significant (${\chi}^2=61.24$, P<0.001). Furthermore, adult ticks demonstrated remarkably greater infection rate than immature ticks (${\chi}^2=10.12$, P=0.018), meanwhile ticks on Erinaceidae showed significantly higher positivity than ticks collected on other host species (${\chi}^2=108.44$, P<0.001). Genetic fragment sequencing and analyses showed at least 4 pathogen species presence in ticks, namely Borrelia yangtzensis, Rickettsia slovaca or Rickettsia raoultii related genospecies, Babesia vogeli and Hepatozoon canis or Hepatozoon felis related genospecies. The finding indicates that the abundant ticks can carry diverse pathogens in Poyang Lake region, and pathogen infection is highly related to species, vertebrate hosts and life stages of ticks.