• Journal of Astronomy and Space Sciences
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• 제24권2호
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• pp.135-144
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• 2007

우주파편의 개수가 증대되면서 운용 중인 인공위성이 받을 수 있는 위험이 커지고 있다. 이 연구는 2007년 1월 11일에 발생한 중국의 FengYun 위성 격추사건과 관련하여 발생한 우주파편이 다목적 실용위성 3호에 미치게 될 영향을 분석하는 것이 목적이다. 폭발 후 발생한 FengYun 위성파편의 일부 관측자료를 바탕으로, 크기가 작아 관측이 안되는 파편들의 질량에 대한 생성개수를 추정하였다. 이를 토대로, FengYun 위성파편에 대한 공간밀도와 플럭스를 계산하였다. 또한 FengYun 위성 파편과 다목적실용위성과의 충동확률 및 손상확률을 분석하였다. 이 논문에서 개발된 모델을 사용하여 앞으로 우리나라에서 만들어질 위성들의 우주파편에 대한 위험도를 해석할 수 있을 것이다.

• 콘크리트학회논문집
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• 제26권4호
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• pp.465-474
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• 2014

콘크리트 구조물이 전생애주기 동안 발생시키는 오염물질의 종류와 발생강도를 정량적으로 분석하고 이로 인한 인간과 생태계, 지구환경 및 자원 고갈 측면에 미치는 피해를 고려하기 위하여 피해산정형 전과정평가 기법을 적용한 콘크리트 구조물의 환경영향평가를 실시하였다. 평가대상은 25층 공동주택의 벽체 구조물이며, 동일한 기능을 수행하기 위한 콘크리트 구조물의 압축강도를 일반강도에서 고강도까지 24 MPa, 40 MPa, 60 MPa로 각각 변화시켜 평가하였다. 평가기간은 50년으로 제한하였고, 생애주기는 원료 채취부터 투입원료의 생산, 구조물의 시공, 사용 및 폐기 단계를 포함시켰다. 피해산정형 전과정평가는 전과정 영향평가(LCIA) 단계 중 정규화와 가중화 단계에서 실시되는데, 특성화 단계에서 산출된 환경영향범주 결과를 인체건강, 생태계의 질, 기후변화 및 자원고갈 관점에서 단일지수화 시킬 수 있는 모델을 제시한다. 평가 결과, 콘크리트 구조물의 환경영향은 여러 영향범주 중 지구온난화, 호흡계 무기물질, 및 비재생 에너지원의 사용으로 인한 영향이 전체 환경부하의 99% 이상을 차지하는 것으로 나타났으며, 압축강도의 변화에 따라 모든 환경영향범주의 값이 일괄적으로 증가 또는 감소하는 것이 아니기 때문에 전체적인 환경영향을 살펴보기 위해서는 종말점 수준의 피해산정형 평가모델을 적용하여 모든 환경영향범주를 종합적으로 고려할 필요가 있다.

• 한국환경과학회지
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• 제22권1호
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• pp.59-72
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• 2013

The purpose of this study is to assess the effects of heavy metal concentrations in the blood and urine of the general population. This research had been conducted from April to December 2008, studying 545 residents of Daejeon and Chungcheong Province. Through the concentrations of heavy metals(Pb, Cd, Hg, As, Mn) in the biota samples and questionnaires, the residents heavy metal exposure level and the influential factors according to personal characteristics or lifestyle were evaluated. As to the heavy metal concentration in the blood and urine of the comparing region, were As and Mn statistically significant(p<0.01, p<0.05). Blood lead and urinary mercury concentrations were higher in males than females. The heavy metal concentration for each age group increased blood mercury. The concentration of all heavy metals were higher in the drinkers than in the non-drinkers. Blood lead and mercury concentrations were higher in the smokers than in the non-smokers, but the urinary cadmium, arsenic and blood manganese was higher in the non-smokers than in the smokers. As to the blood lead and urinary cadmium concentration according to the food preference fish showed high concentration. To clarify the factors affecting the heavy metal concentration in biota among subjects multiple regression analysis was conducted. As a results, it turned out that as to lead content in blood, sex, age and smoking have influence on the subjects with explanatory adequacy of 14.0 %. These results demonstrated that the factors affected the concentrations of heavy metals in blood and urine. The results of this study could be used as the foundational data for setting the health risk assessment.

• 한국환경과학회지
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• 제22권1호
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• pp.47-57
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• 2013

Studies evaluating the health effects of hazardous air pollutants assume that people's exposure to typical pollutant level is the same as specific regional pollutant level. However, depending on social and demographic factors, time-activity pattern of people can vary widely. Since most people live in indoor environments over 88% of the day, evaluating exposure to hazardous air pollutants is hard to characterize. Objective of this study was to estimate the exposure levels of university students of $NO_2$, VOCs(BTEX) and $PM_{10}$ using the scenarios with time-activity pattern and indoor concentrations. Using data from time-use survey of National Statistical Office in 2009, we investigated time-activity pattern of university students and hourly major action. A total of 1,057 university students on weekday and 640 on weekend spent their times at indoor house 13.04 hr(54.32%), other indoors 7.70 hr(32.06%), and transportation 2.36 hr(9.83%). Indoor environments in which university students spent their times were mainly house and school. Air pollutants concentrations of other indoor environments except house and school such as bar, internet cafe and billiard hall were higher than outdoors, indicating that indoor to outdoor ratios were above 1. According to three types of exposure scenarios, exposure to air pollutants could be reduced by going home after school.

• 한국항행학회논문지
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• 제20권2호
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• pp.141-147
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• 2016

항행안전시설에서 제공되는 항행정보의 서비스를 지속적으로 향상시켜 공항 운영 경쟁력 증진과 항행정보 이용자인 항공기 조종사, 항공교통관제사, 항공사, 및 일반인에게 안정성과 신뢰성 있는 항행정보 서비스 제공이 필요하다. 항행시설 안전성숙도 평가(ASMS; ANSP safety maturity survey)는 항행안전시설 분야의 조직 경영, 안전과 위험관리, 정책 기준 절차관리, 교육훈련 및 근무환경 등 유지관리 및 안전관리 필수요건들이 어느 수준까지 충족하는지를 평가하는 체계이다. 동 평가개발의 추진방침은 국제운영 우수사례 (Eurocontrol, FAA) 등 안전성숙도 평가모델 분석기법을 벤치마킹하여 국내 항행시설 평가체계 분야에 적용하고, 항행시설 유지관리 및 안전도의 계량적인 수준 측정을 위한 핵심 구성요소 발굴을 통해 유지관리(management) 분야의 26개 평가항목 및 안전관리(safety) 분야의 23개 평가항목으로 구성된 평가모델을 개발하였다. 항행시설 안전성숙도평가를 통해 항행안전시설의 성능개선 및 안전사고 예방은 물론 각종 서비스 향상을 유도하여, 이용자에게는 최상의 항행정보를 제공하기 위한 것이다.

• Journal of Nutrition and Health
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• 제30권1호
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• pp.61-74
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• 1997

A dietary intake survey in 2 major city area was conducted as a part of the study which determined the level of exposure of people to harmful substances in foodstuff. A total of 800 randomly selected men and women aged 20-49 yr and living in the cities of Seoul and Taegu were invited to participate in the survey. All subjects were interviewed by trained dietitians to answer for demorgraphic characteristics and dietary intake for 1 day by 24hr recall method, and asked to record what day ate for following 2 more days by themselves. Results were analyzed and presented for the amount and frequency of food intake by area, sex body weight. Food consumed most by adults resifing in these 2 city area was rice and followed by kimchi in the amount of 225.7g/persn/day and 85.0g/person/day, respectively. In the list of foods consumed most frequently, items used for condiments were included in addition to rice and kimchi. And the total daily intake of food per person was summed up to be 1, 534g for men and 1, 304g for women. Considerable part of this sexual difference in total intake was originated from the difference in beverage consumption including alcoholic beverages and the higher intake of certain foodstuff due to higher body weight of men. Intake data were presented din terms of per capita and per kg body weight, and compared among adults in different categories of body weight, also. The data gathered here, food intake by individuals, reflect our own dietary culture in terms of food assortment and relative contribution of each food item to total food intake include the consumption of "extreme" eaters might be found useful also especially for the sake of food safety such as risk assessment using ADI and PTWI for contaminants in the food supply.od supply.

• Nutrition Research and Practice
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• 제8권5호
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• pp.544-549
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• 2014

BACKGROUND/OBJECTIVES: Obesity-associated insulin resistance is a strong risk factor for type 2 diabetes mellitus. The aim of this study was to investigate the effect of myricetin on adiposity, insulin resistance, and inflammatory markers in mice with diet-induced insulin resistance. MATERIALS/METHODS: Five-week-old male C57BL/6J mice were fed a basal diet, a high-fat, high-sucrose (HFHS) diet, or the HFHS diet containing 0.06% myricetin or 0.12% myricetin for 12 weeks after a 1-week adaptation, and body weight and food intake were monitored. After sacrifice, serum lipid profiles, glucose, insulin, adipocyte-derived hormones, and proinflammatory cytokines were measured. The homeostasis model assessment for insulin resistance (HOMA-IR) was determined. RESULTS: Myricetin given at 0.12% of the total diet significantly reduced body weight, weight gain, and epidydimal white adipose tissue weight, and improved hypertriglyceridemia and hypercholesterolemia without a significant influence on food intake in mice fed the HFHS diet. Serum glucose and insulin levels, as well as HOMA-IR values, decreased significantly by 0.12% myricetin supplementation in mice fed the HFHS diet. Myricetin given at 0.12% of the total diet significantly reduced serum levels of leptin, tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$) and interleukin-6 (IL-6) in mice fed the HFHS diet. CONCLUSIONS: These findings suggest that myricetin may have a protective effect against diet-induced obesity and insulin resistance in mice fed HFHS diet, and that alleviation of insulin resistance could partly occur by improving obesity and reducing serum proinflammatory cytokine levels.

• Nutrition Research and Practice
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• 제14권2호
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• pp.143-151
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• 2020

BACKGROUND/OBJECTIVES: The nutrition of the elderly depends on various factors. Oral health, especially oral dryness, can be an important risk factor. In this study, we attempted to determine whether dry mouth is associated with compromised nutrient intakes. SUBJECTS/METHODS: A total of 120 participants aged 65-86 yrs (mean age: 69 ± 1 y) were included in this study. Demographic and health-related characteristics, living status, meals, number of medications, medical conditions, chewing ability, and quality of life, the Oral Health Impact Profile (the OHIP-14) were assessed. We performed one day 24-hr recall assessment for nutrient analyses. The differences of the means between the dry-mouth and non-dry-mouth groups were analyzed. Elderly subjects with xerostomia-induced dry mouth were classified as those who reported at least one dryness symptom on a questionnaire. RESULTS: A significant difference in population distribution was observed among the elderly who took medications for hypertension, diabetes and osteoporosis and was significantly higher in the dry-mouth group (70.2%) than in the non-dry-mouth group (44.4%) (P = 0.005). Compared with the non-dry-mouth group (50.8%), a significantly higher proportion (73.7%) of participants in the dry-mouth group took multiple medicines (≥ 4 medications) (P = 0.019). The intakes of vegetable fat, vitamin E, folate and water in the dry-mouth group were lower than in the non-dry-mouth group. The intakes of fluoride and ω-3 fatty acids were significantly lower in the dry-mouth group than in the non-dry-mouth group. CONCLUSION: The participants in the dry-mouth group exhibited low nutrient and water intakes. It is recommended that the elderly with dry mouth should drink sufficient water and receive targeted and specific nutritional guidance to prevent malnutrition.

• 한국안전학회지
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• 제30권3호
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• pp.135-140
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• 2015

Individuals who are vulnerable during disaster - including elderly, people with disabilities, children, pregnant women and etc - have a strong desire to protect themselves when disaster strikes since they are less capable to deal with the impact of disaster. Their experience and effort to keep them safe can be used as a resource to reduce the impacts of disaster not only for them but also for the community as a whole. Therefore, voluntary disaster management program will contribute to our society as a tool to respond effectively to disaster not only to meet the vulnerable's special needs but also to enhance community safety and public interest. This paper suggests a model that able "disaster vulnerable population" to take a leadership role in identifying risk and vulnerability factors, recommending disaster management strategy, and through that, contributing to enhance society's disaster plan. Therefore, this study aimed to surveyed individuals including "disaster vulnerable population" in order to assess the vulnerable's participation in disaster related volunteer work and surveyed associated institutions(volunteer centers, community centers) in order to research currently existing relevant programmes and the participation of "disaster vulnerable population" in such programmes. Also conducted focus group interview to explore voluntary program which will possibly integrate "disaster vulnerable population" into disaster management activities. As a result, three types of voluntary disaster management programs - education, public-relations, and activity - were suggested.

• 정보보호학회논문지
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• 제25권4호
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• pp.961-974
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• 2015

ESM에서 SIEM으로의 발전은 더 많은 데이터를 기반으로 상관분석을 할 수 있게 되었다. 취약점 진단에서 발견된 소프트웨어 취약점을 CWE와 같은 분류 표준으로 수집을 한다면, 로그 분석 및 취합, 보안관제 및 운용 과정 등에서 통일된 유형의 메시지를 활용함으로써 초기대응단계에서의 귀중한 시간절약으로 신속하게 대응할 수 있고, 모든 대응 단계에서 일관성을 유지하여 처리할 수 있게 된다. 취약점 진단과 모니터링 단계에서 CCE, CPE, CVE, CVSS 정보를 공유하여, 사전에 정의된 위협에 대해서만 탐지하지 않고, 각 자산이 가지고 있는 소프트웨어 취약점을 유기적으로 반영할 수 있도록 하고자 하였다. 이에 본 논문에서는 SIEM의 빅데이터 분석 기법을 활용하여 소프트웨어 취약점에 대한 위협을 효과적으로 탐지하고 대응할 수 있는 모델을 제안하고 적용해본 결과 기존의 방법으로 탐지할 수 없었던 소프트웨어 취약점을 탐지함으로서 효과적임을 확인하였다.