• 한국응용과학기술학회지
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• 제34권4호
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• pp.818-826
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• 2017

신 재생에너지 보급통계에 의하면 바이오매스 발전실적은 2013년 부터 급증하고 있으며 그 중에서 가장 급격하게 증가한 연료는 Wood pellet으로 2013년 696Gwh, 2014년 2,764Gwh, 2015년에는 2,512Gwh를 발전 하였고 국내 Wood pellet 총 소비량은 2015년 기준 148만톤이며 그 중 발전용으로 소비된 Wood pellet은 108만톤으로 약 73%를 차지하고 있다. 본 연구에서 Wood pellet 소요량을 예측한 결과 국내 발전용으로 필요한 Wood pellet 소요량은 2020년 261만톤, 2025년 685만톤, 2030년 1,139만톤이 필요하며, 최적 바이오매스 발전량 산정을 위하여 바이오매스 발전소에서 국내 생산 Wood pellet 사용량을 50% 사용한다는 가정하에 기 허가 신청된 발전소를 가동하기 위해서는 2021년 226만톤의 Wood pellet이 국내에서 생산되어야 한다는 결론이 도출 되었다.

• 한국환경복원기술학회지
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• 제22권1호
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• pp.1-11
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• 2019

This study suggested that various stakeholder can be participated in regional Environment planning and practical use of policy with rapid assessment of Ecosystem Services(ES). We applied to the rapid assessment of ES method to Ansan city and local registers selected Ecosystem assets that considered to space of ES. Ecosystem assets were measured 5 types Likert scale about 37 indicators of ES and confirm the main ES through the basic statistics. Furthermore Ecosystem assets classified according to similar character of ES. Ecosystem assets of Ansan were selected 47 site and Local climate regulation, Research and education, Primary production was high among the ES indicators. As a result two main group deduced that ecological education group(such as Research and education, Habitat) and safety regulation group(such as Air regulation, Fire regulation) through the factor analysis. In terms of location characteristics of each group, the ecological education-centered ecosystem assets were located near the downtown area, while the safety regulation group was located at the outskirts, such as mountains and coasts. This indicates that the ecological education about the habitat provision can be achieved in Ansan city downtown area and that outskirts should be approached from the aspect of ecological function to establish a plan. The result of Rapid assessment of ES, which can be lead a balanced and developmental consultation when establishing polices for environment planning and management in region.

• 한국응급구조학회지
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• 제25권2호
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• pp.19-38
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• 2021

Purpose: This study aimed to investigate the relationship between emergency medical service accessibility in different regions and the sudden death rate in elderly patients with ischemic heart disease using data analysis techniques and suggest improvements in regional emergency medical services. Methods: The study collected data from the NEDIS database and Statistics Korea. Data on a total of 75,867 patients aged ≥65 years were reviewed among patients with ischemic heart disease who visited emergency medical institutions in 2018. Frequency analysis, chi-square test, multiple logistic regression analysis, and simple logistic regression analysis were performed using SPSS PC Window 25.0. Results: With an emergency medical resource per 100km², there was a concomitant reduction in the risk of death. There was a decrease in the death rate by 0.967, 0.970, 0.997, and 0.391 times with the increase in the presence of a fire department, an ambulance, a paramedic, and a regional medical center, respectively. Furthermore, a decrement in the death rate was witnessed 0.844, 0.825, and 0.975 times with the initiation of a local emergency medical center, a local emergency medical institution, and an angiography device, respectively(p <.001). Conclusion: To improve the accessibility of emergency medical services, the population and geometric area of the region should be considered essential factors when deploying emergency medical resources.

• 한국안전학회지
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• 제35권6호
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• pp.25-31
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• 2020

Boiling Liquid Expanding Vapor Explosion(BLEVE) can cause not only economic damage to the plant but also serious casualties. LPG accidents account for 89.6 percent of all accidents caused by gas leaks in Korea over the past nine years, while casualties from accidents also account for 73 percent of all accidents, according to statistics from the Korea Gas Safety Corporation. In addition, a potential explosion and a fire accident from one LPG storage tank may affect the nearby storage tanks, causing secondary and tertiary damage (domino effect). The safety distance standards for LPG used by LPG workplaces, charging stations, and homes in Korea have become stricter following the explosion of LPG charging stations in Bucheon. The safety distance regulation is divided into regulations based on the distance damage and the risk including frequency. This study suggests two approaches to optimizing the safety distance based on the just consequence and risk including frequencies. Using the Phast 7.2 Risk Assessment software by DNV GL, the explosion overpressure and heat radiation were derived according to the distance caused by BLEVE in the worst-case scenario, and accident and damage probability were derived by considering the probit function and domino effect. In addition, the safety distance between LPG tanks or LPG charging stations was derived to minimize damage effects by utilizing these measures.

• 한국환경보건학회지
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• 제49권3호
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• pp.149-158
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• 2023

Background: Injury is one of the major health problems in South Korea. Few studies have evaluated both intentional and unintentional injury when investigating the association between exposure to air pollutants and injury. Objectives: We aimed to explore the association between short-term exposure to ambient air pollution and years of life lost (YLLs) due to injury. Methods: Data on daily YLLs for 2002~2019 were obtained from the the Death Statistics Database of the Korean National Statistical Office. This study estimated short-term exposure to particulate matter with an aerodynamic diameter of <10 ㎛ (PM₁₀), particulate matter with an aerodynamic diameter of <2.5 ㎛ (PM_2.5), sulfur dioxide (SO₂), nitrogen dioxide (NO₂), carbon monoxide (CO), and ozone (O₃). This time series study was conducted using a generalized additive model (GAM) assuming a Gaussian distribution. We also evaluated a delayed effect of ambient air pollution by constructing a lag structure up to seven days. The best-fitting lag was selected based on smallest generalized cross validation (GCV) value. To explore effect modification by intentionality of injury (i.e., intentional injury [self-harm, assault] and unintentional injury), we conducted stratified subgroup analyses. Additionally, we stratified unintentional injury by mechanism (traffic accident, fall, etc.). Results: During the study period, the average daily YLLs due to injury was 307.5 years. In the intentional injury, YLLs due to self-harm and assault showed positive association with air pollutants. In the unintentional injury, YLLs due to fall, electric current, fire and poisoning showed positive association with air pollutants, whereas YLLs due to traffic accident, mechanical force and drowning/submersion showed negative associations with air pollutants. Conclusions: Injury is recognized as preventable, and effective strategies to create a safe society are important. Therefore, we need to establish strategies to prevent injury and consider air pollutants in this regard.

• 한국구조물진단유지관리공학회 논문집
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• 제17권3호
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• pp.118-125
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• 2013

폴리비닐알코올 섬유와 폴리에틸렌 섬유 등의 합성 섬유는 고연성 섬유보강 시멘트 복합재료를 제조하는데 성공적으로 사용되고 있다. 폴리프로필렌 섬유 역시 복합재료를 제조하는데 사용되고 있지만, 고연성을 구현하는 목적보다는 고온에 노출된 콘크리트의 내화 성능 향상 목적으로 사용되고 있다. 이 연구에서는 폴리프로필렌 섬유로 보강된 시멘트 복합재료의 성능을 향상시키는 방법에 대하여 논하고자 한다. 폴리프로필렌 섬유보강 시멘트 복합재료의 성능을 평가하기 위하여 5가지 배합을 결정하였다. 1종 보통포틀랜드시멘트 (OPC)와 OPC를 다량 치환한 플라이애시를 결합재로 사용하였고 물-결합재 비는 0.23~0.25이다. 또한 부피비로 2%의 폴리프로필렌 섬유가 사용되었으며, 연성을 향상시킬 목적으로 폴리스틸렌 비드가 사용되었다. 슬럼프, 밀도, 압축강도, 1축 인장 실험을 포함한 일련의 실험을 수행하였으며, 실험결과, 파괴역학, 마이크로역학, 통계이론을 이용하여 폴리프로필렌 섬유보강 시멘트 복합재료의 성능을 향상할 수 있는 것으로 나타났다.

• 한국농림기상학회지
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• 제16권4호
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• pp.336-342
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• 2014

본 연구는 우리나라의 광역지자체의 산림지 온실가스 배출량을 시범산정하기 위해 수행되었다. 온실가스 배출량은 국가 온실가스 인벤토리 산정 지침에 따라 산정하였으며, 이를 위해 임업통계연보 및 산림관련 활동 자료 및 배출계수를 이용하였다. 그 결과 산림지의 2011년 총 배출량은 -58,711Gg $CO_2eq.$, 벌채, 연료재 수집, 산불에 의한 배출량은 19,896Gg $CO_2eq.$로 나타났다. 2011년을 기준으로 산림지에서는 온실가스를 흡수하는 것으로 나타났고, 순 배출량은 -38,815Gg $CO_2eq.$로 나타났다. 광역지자체 별로는 강원도에서 온실가스를 가장 많이 흡수하는 것으로 나타났다. 본 연구의 산정결과는 현재 중복산정을 최대한 배제하고자 많은 통계를 활용하지 않은 것으로, 향후 활동자료 및 배출계수 등을 보완하여 산정할 필요가 있을 것으로 사료된다.

• 동의생리병리학회지
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• 제25권1호
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• pp.138-143
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• 2011

In spite of abundant clinical resources of stroke patients, the objective and logical data analyses or diagnostic systems were not established in oriental medicine. As a part of researches for standardization and objectification of differentiation of syndromes for stroke, in this present study, we tried to develop the statistical diagnostic tool discriminating the 4 subtypes of syndrome differentiation using the essential indices considering the sex. Discriminant analysis was carried out using clinical data collected from 1,448 stroke patients who was identically diagnosed for the syndrome differentiation subtypes diagnosed by two clinical experts with more than 3 year experiences. Empirical discriminant model(V) for different sex was constructed using 61 significant symptoms and sign indices selected by stepwise selection. We comparison. We make comparison a between discriminant model(V) and discriminant model(IV) using 33 significant symptoms and sign indices selected by stepwise selection. Development of statistical diagnostic tool discriminating 4 subtypes by sex : The discriminant model with the 24 significant indices in women and the 19 significant indices in men was developed for discriminating the 4 subtypes of syndrome differentiation including phlegm-dampness, qi-deficiency, yin-deficiency and fire-heat. Diagnostic accuracy and prediction rate of syndrome differentiation by sex : The overall diagnostic accuracy and prediction rate of 4 syndrome differentiation subtypes using 24 symptom and sign indices was 74.63%(403/540) and 68.46%(89/130) in women, 19 symptom and sign indices was 72.05%(446/619) and 70.44%(112/159) in men. These results are almost same as those of that the overall diagnostic accuracy(73.68%) and prediction rate(70.59%) are analyzed by the discriminant model(IV) using 33 symptom and sign indices selected by stepwise selection. Considering sex, the statistical discriminant model(V) with significant 24 symptom and sign indices in women and 19 symptom and sign indices in men, instead of 33 indices would be used in the field of oriental medicine contributing to the objectification of syndrome differentiation with parsimony rule.

• 대한치과기공학회지
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• 제34권4호
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• pp.447-455
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• 2012

Purpose: This study was to investigate oral hygiene knowledge and the actual condition of oral care for the students in the public health and non-public health Departments. Methods: The survey sample consisted of 262 randomly selected students. 197 of them are public health-related students and 65 are non-public health-related students. The questionnaires used in this study consisted of 4 items for general information, oral health status of 2 items, 5 items for Oral hygiene knowledge and actual condition of oral care of 5 items. Collected data were analyzed by Frequency Analysis t-test and Crosstabs using SPSS(Statistical Package for Social Sciences) Win 19.0 statistics program. Results: Regarding general characteristics of the subjects, there were 53.8% of first-year student, 26.0% of second-year student and 20.2% of third-year student among 52.3% of males and 47.7% of females. The subjects received less than "100,000" won(13.0%), "100,000-190,000" won (5.0%), "200,000-290,000" won(30.9%), "300,000-390,000" won (33.2%) and more than "400,000" won(17.9%) a month for an allowance. The subjects had 'none' (44.3%), '1'(6.5%), '2'(12.6%), '3'(5.0%), '4'(5.3%), 'more than' 5(0.8%) of dental caries and 'do not know' were 25.6%. The numbers of dental prosthetics were 'no' (35.5%), '1'(13.7%), '2'(17.2%), '3'(10.3%), '4'(11.5%), and 'more than 5'(11.8%). The public health students(84.8%) had a higher positive response rate than the non-public health students(66.2%). The public health students(80.2%) had a higher negative response rate than the non-public health students(78.5%) in the result of onset of gum disease pain awareness. The non-public health students(65.5%) had a higher negative response rate than the public health students(68.3%)) in the result of heredity of gum disease. The t-test showed that public health-related department students(M=8.264, SD=0.821) had more knowledge about oral hygiene than non-public health-related department students(M=8.015, SD=1.082). 'do not use' in the oral care products except toothpaste and toothbrush showed that public health-related department students(60.4%) use the products more than non-public health-related department students(66.2%). Conclusion: In this study, public health-related department students had higher oral hygiene knowledge and actual condition of oral care compared to non-public health-related students, but low in practical action. Due to the lower level of dental care products use in non-public health-related department, a continuous oral care education program is required.

• 한국항해항만학회지
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• 제29권1호
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• pp.35-42
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• 2005

본 연구는 선원들이 가지고 있는 스트레스 인지정도와 대처방법을 분석하여 선원들을 위한 스트레스 관리 방안을 마련하는데 기초자료가 되고자 시행한 횡단적 조사연구이다. 연구의 대상은 한국해양수산연수원에서 2003년 10월 20일부터 11월 15일까지 안전교육을 수강하는 선원 428명이었으며 설문지에 의한 방법으로 수집하였다. 연구에 사용된 도구는 스트레스 인지와 대처방법을 측정하는 도구이며, 수집된 자료는 SPSS 10.1 통계 프로그램을 이용하여 서술 통계, t-test, ANOVA로 분석하였다. 본 연구의 결과는 다음과 같다. 1) 일반적 특성간의 스트레스 인지정도의 차이를 살펴본 결과. 항해 구역, 결혼 상대, 흡연량, 음주 횟수, 운동 횟수, 수면 양상, 수면 시간, 여가 시간, 직업 만족도 특성에서 스트레스 인지정도의 유의한 차이가 있었다. 2) 일반적 특성에 따른 스트레스 대처방법의 차이를 확인한 결과, 집단간 유의한 차이가 있는 특성으로는 현재 신분, 항해 구역, 연령, 승선 경력, 학력, 결혼 상태, 연 수입, 음주 횟수, 음주량, 운동 횟수, 수면 양상, 직업 만족도로 나타났다. 3) 스트레스 인지정도와 대처방법간의 차이를 알아본 결과, 스트레스 점수가 높은 집단이 정서 중심의 대처와 소망적 사고를 많이 하는 것으로 나타났다.