• 한국안전학회지
• /
• 제32권3호
• /
• pp.123-129
• /
• 2017

This study deals with the traffic accident of truck at circular intersection. The purpose of this study is to develop the truck accident models based on type of accident and conflict. In pursuing the above, the study gives particular attentions to selecting the appropriate models among Poisson and Negative binomial models using statistical program LIMDEP 8.0. The traffic accident data from 2007 to 2014 are collected from TAAS data set of Road Traffic Authority. Such the dependent variable as number of truck accidents and the 24 independent variables as geometry, traffic volume and others are used. The main results are as follows. First, 5 Poisson models (${\rho}^2$ of 0.164~0.351) which are all statistically significant are selected. Second, the common variable based on type of accident and conflict is analyzed to be truck apron width. The specific variables are, however, evaluated to splitter island, area of splitter island, speed limit sign, truck apron, number approach road, circular intersection sign, speed hump and traffic volume. Finally, widening the truck apron width and improving the above specific variables are analyzed to be important for truck accident reduction at circular intersections.

• 한국안전학회지
• /
• 제32권5호
• /
• pp.129-134
• /
• 2017

This study aims to develop the traffic accident models by circular intersection type using count data model. The number of accident, the number of fatal and injured persons(FSI), and EPDO are calculated from the traffic accident data of TAAS. The circular intersection accident models are developed through Poisson and negative binomial regression analysis. The main results of this study are as follows. First, the null hypotheses that there are differences in the number of traffic accidents, FSI and EPDO by type of circular intersections are rejected. Second, the scale of intersection(median, large), number of approach road, mean width and length of exit road, area of the circulating roadway and central island are selected as factors influencing the number of traffic accidents, FSI and EPDO in rotary. Third, the scale of intersection(median), guide signs(limited speed, direction, roundabout), number of approach road, entry angle, area of the intersection and central island are adopted as factors influencing the number of traffic accidents, FSI and EPDO in roundabout. Finally, transferring from rotary to roundabout could be expected to make the accident decrease.

• 한국항공운항학회지
• /
• 제20권4호
• /
• pp.106-114
• /
• 2012

As Incheon International Airport(IIA) is located in an island 50-km away from Seoul, various travel equipments for access are required. So far two connecting bridges are constructed funded by civilian funds. For the further bridge construction, the reduction of forecast traffic amount and the government subsidy for the civilian funds are big issues. Comparing the access traffics of IIA to those other competing airports, traffic conditions inside the airport are superior to other competing airports from the management point of view, as utilization conditions and equipment capacities are periodically monitored and evaluated to set up comprehensive countermeasures following constructing by stages. However, while the accessability to IIA is very important, as IIA is built on an island the conflicts between near-by developers and traffic facility operators make further bridge construction difficult. As improving the accessibility to an airport is not easy to achieve only by the IIA management's efforts, the central government level authorities should organize a committee with agencies concerned and analyze the characteristics of access traffic periodically to suggest reform measures for each organization concerned to implement appropriate undertakings at apt timing. For the future, central government's level empirical research on the airport accessibility for synthetic and systematic plan set-up is expected.

• 한국항공운항학회지
• /
• 제23권4호
• /
• pp.12-21
• /
• 2015

Due to the influence of Han-la Mountain which is located at the center of Jeju Island, a radar blind sector has been appearing in the south-east, low-altitude area of Jeju Island. Thus, the region is perilous for aircraft using surveillance in this area with the existing radar equipment that is currently available. In addition, as the popularity for domestic leisure aviation is on the rise, the safety in low-altitude area should be guaranteed. Where not only IFR flights but also VFR flights are mainly used. Therefore, immediate measures to the present state of radar blind sector in Jeju Island should be taken into serious account. Regarding the circumstances, this study's purpose is to help secure the aviation safety in Jeju region by analyzing the current air traffic surveillance system in Jeju Island and comprehending its vulnerable factors. Moreover, this study compares secondary radar surveillance system, ADS-B and MLAT(Multilateration) system with factors based on the guidance materials from ICAO Asia and Pacific region office to suggests an adequate surveillance technology considering the regional characteristics of Jeju.

• 대한토목학회논문집
• /
• 제31권2D호
• /
• pp.209-215
• /
• 2011

회전교차로는 교차로 중앙에 원형 교통섬을 두고, 교차로를 통과하는 자동차가 이 원형 교통섬을 우회하도록 하는 평면교차로의 일종이다. 국내에서는 국토해양부에서 회전교차로 설계지침을 2004년 잠정발표 하였다. 이것은 우리나라의 교통여건이 검토되지 않은 외국의 사례를 검토 소개한 것이다. 또한, 최근 국가경쟁력강화를 위해 녹색성장의 일환으로 회전교차로에 대한 관심이 집중되고 있다. 그러나 현재 기존 회전교차로 잠정지침에서는 회전교차로의 용량 및 설치 여건, 그리고 계획절차 등에 관해 기술하고 있으나, 유형별 설계요소가 개략적이고 명확하지 않아 회전교차로 설계 적용에 있어 어려움이 존재하고 있다. 본 논문에서는 국내에 설치된 많은 유형중 접근로의 모든각이 90도인 4지 회전교차로와 72도, 45도, 30도로 한군데에서 교차하는 5지 회전교차로에 대해 모의실험을 실시하였다. 1차로 회전교차로에서 내접원 직경이 커질수록 평균통행 시간이 감소하며, 5지 회전교차로의 모든 교차각에서는 시간당 교통량이 2,000대까지는 90도로 교차하는 4지 회전교차로와 비슷한 효과를 얻을 수 있는 것으로 분석되었다.

• 농촌의학ㆍ지역보건
• /
• 제21권2호
• /
• pp.243-251
• /
• 1996

Authors surveyed the inhabitants in Ulnung Island to assess the patterns of medical utilization. One hundred eighty six population(65 male and 121 female) were surveyed with formed questionnaire from Aug. 16 to Aug. 19 in 1994. Results are as follows. 1. The prevalence rate of acute diseases was 19.3%. 2. The prevalence rate of chronic diseases was 35.0%. In classification of chronic disease, the disease of musculoscletal system was the highest(33.9%) and that of digestive system in next order. 3. The first-visit medical facility when disease developed was community health center mainly. The admission care was taken in 37.6%. The 80.0% among location of medical facility for admission care was out of island. The surgical operative care were taken in 19.9%. The 86.5% among location of medical facility for surgical operative care was out of island. 4. Among the contents of dissatisfaction for medical service within island, 'Insufficient equipment' was the highest(35.8%), and 'Insufficient traffic networks' in next order. The results of this study suggest that public health facilities and medical personnel be strengthened and emergency transfer system be secured in Ulnung Island.

• 해양환경안전학회지
• /
• 제28권7호
• /
• pp.1111-1119
• /
• 2022

신안군 해역의 섬을 통한 관광사업이 활발해지면서 도서 간을 연결하는 해상교량은 현재까지 총 13개가 완공되었다. 그러나 통항로에 설치된 해상교량은 선박통항에 있어 위험성을 주며, 특히 섬과 섬을 연결하는 연도교의 경우 수로의 폭이 매우 좁아 그 위험도는 더욱 높다. 본 연구는 신안군 해역의 연도교에 대한 해상교통조사를 토대로 교각과 선박의 충돌위험도를 항만수로의 위험도 평가 모델인 IWRAP(IALA Waterway Risk Assessment Program)을 활용하여 평가하였다. 그 결과 신안1교가 충돌확률이 가장 높은 것으로 분석되었으며, 통항선박의 대부분은 연안 여객선으로 나타났다. 또한, 신안1교는 대상해역의 교각 중 가장 충돌사고가 많이 발생한 곳으로 본 연구에서는 그 원인을 분석하고자 하였다. 신안1교 해역환경의 위성사진을 영상처리기법으로 분석한 결과 해도에는 볼 수 없는 장애물이 교량 근처에 존재하는 것을 확인할 수 있었다. 이로 인해 장애물을 피해 교량의 통항유도방식인 양방향 통항과 달리 한 방향으로 통항이 집중되는 것을 알 수 있었다. 본 연구의 영상처리기법을 활용한 위험원인 분석방법은 향후 연도교의 위험요인 분석을 하는데 기초자료로 활용될 수 있을 것으로 기대된다.

• 대한교통학회지
• /
• 제23권5호
• /
• pp.73-81
• /
• 2005

기존의 삼각교통섬은 일반적으로 우회전차로와 직진차로의 분리를 위하여 포장면 상단에 연석 등을 이용하여 돌출된 시설물을 사용한다. 그러나, 기존의 삼각교통섬을 좁은 차로의 교차로에 설치할 경우, 대형자동차가 좌회전시 대향 차로를 침범하여 대향 차로에 대기하는 자동차와 충돌할 가능성이 높다. 따라서 대향 차로를 분리하여, 대형자동차가 교차로 회전시 대향 차로를 침범하는 것을 방지해야 할 필요가 있다. 본 연구는 우리나라 여건에서 기존의 삼각교통섬만으로 이루어진 평면교차로와 물방울교통섬이 추가된 평면교차로를 비교하였다. 먼저, 안전성 측면에서 대형자동차의 회전궤적을 고려하여 물방울교통섬의 설치위치 및 형태를 결정하는 방법을 제시하였으며, 운전자 및 주행 쾌적성, 보행자, 확폭량, 경제성측면에서 물방울교통섬이 기존 삼각교통섬에 비해 상대적으로 우위에 있음을 분석하였다.

• 한국수산과학회지
• /
• 제50권5호
• /
• pp.561-566
• /
• 2017

Few studies on the finless porpoise Neophocaena asiaeorientalis have been conducted on the south coast of Korea. This region includes Gadeok Island, which is located off the Korean peninsula in an area of heavy maritime traffic. Sighting surveys of finless porpoises were conducted at seven predetermined spots around Gadeok Island in January, May, July, September, and November 2016. Finless porpoises (127 individuals in 24 schools) were sighted at all but one (spot P5) of the survey locations. Fewer porpoises were spotted in summer (Jul and Sep) than in other seasons (P<0.05). Porpoises were most abundant around the south coast of the island, where they were spotted in every season, and in significantly higher numbers than at other locations (P<0.05). Single individuals accounted for 20.8% of sightings, while 25.0% of sighted schools consisted of only two porpoises. The mean school size was 5.29 individuals (SD=6.72).

• The Korean Journal of Ecology
• /
• 제5권4호
• /
• pp.187-203
• /
• 1982

The results obtained from te field investigations of Chuja Island conducted for 5 days from July 18 to 22, 1980 and from August 12 to 16, 1981 are summarized as follows: Vascular plants of this island disclosed by the present study consisted of 86 families, 210 genera, 228 species, 38 varieties and 4 래금. Nineteen species of evergreen broad-leaved trees were discovered, including Litsea japonica Juss, Camellia japonica L. and Machilus thunbergii Sieb. et Zucc. These indeciduous latifoliate trees were preserved in poor condition. Ten-twenty years old Pinus thunbergii was confirmed to be the predominant species. Seaside plants encountered were 6 species, including Vitex rotundifolia L. Fil. and Asterspathullfoius Max., but they were poorly distributed. Naturalized plants comprised a total of 12 species. This varied number of species is considered attributable to the frequent access of men owing to convenient marine traffic. the destruction of vegetation of this island may be attributed to human interference (loggin for boat construction, building and charcoal materials) ever escalated by high population density. It is worthy of noting that Bochmeria penosa Nakai et Stake which forms a large community in this island can be used as textile resources.