• 패션비즈니스
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• 제24권5호
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• pp.1-20
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• 2020

This study analyzed the perceptions related to recycling clothing and the actual conditions of unused clothing based on demographic characteristics to help reduce environmental pollution. A total of 833 questionnaires were used in data analysis for this survey study. The subjects consisted of men and women in their 20s to 50s who resided in Gyeongnam and Ulsan, Korea. The data were analyzed by χ²-test using SPSS. The results obtained were as follows. The intention to recycle others' clothing was significantly different for all the demographic characteristics. Overall, the response "I have an intention to recycle others' clothing" was reported by a relatively high proportion of the respondents. The analysis of the motivation to others' clothing showed a significant difference in all demographic characteristics except gender. The main motivation for recycling clothing was because "I wanted to recycle the clothing". The factors hindering recycling others' clothing showed significant differences according to gender, marital status, and occupation. The main hindrance factor was reported as "feeling uncomfortable". The causes of occurrence of unused T-shirts significantly different for all demographic characteristics. The causes of occurrence of unused trousers and skirts was significantly different for all demographic characteristics except monthly income. The cause of undisposed, unused clothing was related to all demographic characteristics Overall, the response "reluctant to dispose of" was reported by a relatively high proportion of the respondents.

• 한국화재소방학회논문지
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• 제19권3호
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• pp.64-69
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• 2005

산불은 경제적 손실뿐만 아니라 인명을 위협할 수 있는 국가적 재해다. 이러한 산불을 미연에 방지하고 피해를 저감하기 위해서는 산불발생위험지역을 사전에 판단하여 효율적으로 관리하는 것이 필요하다. 본 연구에서는 입지환경에서 중요한 부분을 차지하는 산림토양특성 중 토양형, 지형, 토성, 경사, 배수 등과 산불발생지점을 가지고 각 지점별 산불발생위험을 예측할 수 있는 산불발생확률 모형을 개발하였다. 개발 시 조건부확률과 GIS를 이용하였다 개발된 산불발생확률 모형의 적합성 검정을 위하여 추정모형의 예측력 비율을 검토할 수 있는 예측비곡선에 적용한 결과 실효성이 있는 것으로 나타났다. 이러한 결과를 적용하여 산불관리자가 손쉽게 산불발생위험지역을 파악할 수 있도록 위험지역을 구분하였다.

• 한국항해항만학회지
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• 제27권6호
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• pp.611-618
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• 2003

It can be said that the relationship between the maneuvering ability of operators and the navigational environment affects the safe degree of navigation in the collision avoidance situation. In order to reduce the occurrence probability of accident and to maintain the safety, it is necessary to clarify the relationship between human behavior and navigational environment. In this study, therefore, we analyzed and discussed the relationship between the maneuvering characteristics and the safety focused on human behavior as a fundamental factor of marine accidents using ship handling simulator and questionnaire. As a result, we concluded that navigational environment changes variously and the maneuvering ability of operators also varies with the navigational environment, and the ship handling characteristics strongly affect the occurrence probability of accident.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1425-1427
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• 2009

In this paper, we investigated influence of gas pressure and gas mixing ratio on the abnormal discharge characteristics of fluorescent lamp. Abnormal discharge characteristics have been examined by changing inner gas pressure and mixing ratio. As the inner gas pressure and mixing ratio increase, the occurrence of abnormal discharge was delayed. It was found out that the occurrence of abnormal discharge is sufficiently delayed at the optimized inner gas pressure and mixing ratio.

• 한국자동차공학회논문집
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• 제10권5호
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• pp.107-113
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• 2002

LPG has been well known as a clean alternative fuel for vehicles. Recently, several LPG engines for heavy duty vehicles have been developed, which can replace some diesel engines that are one of the main sources for air pollution in the urban area. Because cylinder bore of heavy duty LPG engine is larger than that of gasoline, the study of knock characteristics of LPG engine are needed. In this study, the knock characteristics were investigated with various engine speed, air excess ratios and LPG fuel compositions. Experimental results indicated that the Knock occurrence probability decreases with increasing engine speed and propane fraction of fuel. The Knock occurrence probability is highest at excess air ratio of 1 and decreases as the mixture strength became leaner.

• 해양환경안전학회지
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• 제17권2호
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• pp.123-129
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• 2011

해양오염으로부터 해양환경 및 생태계를 보호하기 위해서는 해양쓰레기 발생 및 이동에 관한 집중적인 연구가 필요하다. 본 연구에서는 해안표착물의 조성과 발생원 분석을 통해 연간 발생량 및 특성에 대한 분석을 하였다. 전라남도 신안군 임자도 대광해수욕장을 대상으로 $100\;m{\times}20\;m$($=2,000\;m^2$) 구역을 설정하여 분포량 및 발생 특성을 분석한 결과, 2008년부터 2010년까지 총 1,445 kg의 해안표착물이 수거되었다. 가장 많은 양을 차자하는 품목은 플라스틱으로서 평균 46.5%, 스티로폼 20%, 목재 12.6% 등으로 나타났다. 외국 기인 발생량은 총 155.5kg으로 이중 90% 이상이 플라스틱류로 대부분 중국 기인의 플라스틱과 어업용 부표였다. 한편, 해안표착물의 발생량 변화를 파악하기 위해 해양 환경의 계절적 변화를 분석하였다. 2009년과 2010년은 북풍 계열의 풍향과 풍속이 우세한 계절에 발생 비율이 높았으며, 2008년은 조류의 흐름이 타 연도의 동일 계절과 달리 서향의 왕복성 흐름을 보인 여름철(7월)에 발생률이 40%(409개)로 가장 높게 나타났다. 외국 기인 해안표착물의 계절별 변화를 살펴보면 전체적으로 1윌, 5월에 발생률이 높았으며 11월이 다음으로 많은 양을 차지하였다. 한편, 2008년에는 여름철 (7월) 발생률이 46%로 가장 높은 데 비해 2009년과 2010년에는 4%의 가장 낮은 비율을 보임으로서 상반되는 결과를 나타내었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 추계학술대회 논문집 학회본부
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• pp.261-263
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• 1994

This paper deals with the on off arc characteristics of electromagnetic relay contacts contaminated by NaCl and $H_2SO_4$. In this paper, I have studied the characteristics of on-off voltage waveform. the contact errosion, contact surface analysis by SEM and EDAX under changed R-L parameter of testing circuit. After considers these result, I have tried to promote the diagnosis method and developed the contacts. As a results, (1) The arc duration and the numbers of arc occurrence characteristics are depended on contamination degree. The contamination degree is high when the arc characteristics is high. (2) Under clean condition, arc occurrence voltage, surge peak voltage, arc duration and the rate of contact errosion is lower than wet condition. (3) Surge peak voltage and arc duration is depended on L parameter. When L is High, the arc characteristics is high.

• 한국습지학회지
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• 제13권3호
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• pp.443-453
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• 2011

본 연구는 소유역별 토지피복특성을 분석하고, 각 소유역로부터 발생되는 비점오염원 부하 특성을 분석하여 각 소유역별로 토지피복특성에 적합한 오염부하 저감 대책을 수립할 수 있는 방법을 제시하는 것을 목적으로 하고 있다. 연구대상유역은 무심천 유역으로 하였으며, 사용된 수질모형은 HyGIS-SWAT을 이용하였다. 토지피복도 분석에서 특정 분류항목이 50%이상의 토지피복 비율을 갖는 토지피복에 따라 시가화지역, 농업지역, 그리고 산림지역으로 구분하여 유출부하 특성을 분석하였다. 분석결과 유사량 및 영양염류의 연간 발생부하량의 크기는 농업지역, 산림지역, 시가화지역의 순서로 발생되는 것으로 분석되었다. 2번 소유역에 대해서 하천을 중심으로 버퍼구역을 설정하고 버퍼구역내 농업지역을 자연초지로 토지피복을 변화시켜 발생부하량을 분석하였다. 분석결과 토지피복변화는 변경전과 비교하여 토지피복변화는 농경지 면적이 소유역내 36.6%에서 27.9% 및 15.3%로 변화되는 것으로 나타났다 2번 소유역에 대한 유사발생량 및 영양염류 발생량 분석결과 유사발생량은 52%에서 약 46% 정도 감소하는 것으로 분석되었고, 영양염류의 경우에도 변경전보다 49% 34% 정도 감소하는 것으로 분석되었다. 향후 추가적인 연구는 각 소유역별로 다양한 오염부하 저감 대책 시나리오를 수립한 후 어떠한 저감대책이 효과적인지를 평가하는 연구를 수행하고자 한다.

• 한국산업보건학회지
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• 제18권4호
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• pp.271-281
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• 2008

This study is to characterize the occurrence types and mineralogical characteristics of asbestos for the Kwangcheon areas, Chungnam. The mine areas had been exploited as asbestos mines for several decades since 1930. Host rocks of the asbestos are serpentinites and altered rocks of the ultramafic rocks. Representative samples of the host rocks and minerals were sampled and were examined with microscopes. To confirm for the existences and compositions for the asbestos, the rock samples were analysed with EPMA, XRD and EDS. Chrysotile, tremolite and actinolite were found as asbestos and non-asbestos forms in these areas. Chrysotiles, as non-asbestos forms, occur in the host rocks with mesh and hourglass textures. They, as asbestos forms, are mainly found as the veins. The tremolite and actinolite, as asbestos types, occur as alteration products of the olivine and pyroxene within the host rocks. They, as asbestos types, are also found following the cracks and fractures. Overall results suggest that three types of the asbestos are found in the Kwangcheon and Kaewol mine areas. Based on the occurrence types for the asbestos, additional studies are required for the asbestos in the top soil and air.

• 한국환경과학회지
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• 제16권5호
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• pp.583-591
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• 2007

In this study, meteorological characteristics concerning the occurrence of fog are analyzed using 4-years (2000-2003) data at Chuncheon. From the analysis of meteorological characteristics, the fog at Chuncheon occurred before sunrise time and disappeared after that time and lasted for 2-4 hours. When fog occurred, on the whole, wind direction was blew the northerly and wind speed was below 2.1 m/s. Especially, about 42 % of foggy day fell on the calm($0{\sim}0.2m/s$) conditions. The difference between air temperature and dew point temperature near the surface were mainly less than $2^{\circ}C$. For the lack of water surface temperature, the water sur-face temperature was calculated by using Water Quality River Reservoir System (WQRRS). In Chuncheon, there is close correlation between the frequency of fog day and outflow from Soyang reservoir and high frequency of occurrence due to the difference between air and cold outlet water temperature.