• 대한교통학회지
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• 제26권3호
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• pp.85-95
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• 2008

고속도로 교통사고 발생의 주요 원인인 과속을 줄이기 위하여 경찰청에서는 많은 예산을 들여 과속단속카메라를 설치 운영하고 있다. 지점식 과속단속카메라의 경우 GPS 탑재장치에 의해 위치가 노출되어 과속단속 실적이 떨어지며, 과속단속카메라가 설치되지 않은 차로나 구간에서 캥거루 주행 등 회피거동에 의해 과속억제 효과 또한 감소하고 있다. 운전자의 회피거동으로 인하여 긴 내리막 구간, 터널, 교량 등에서 과속예방효과나 교통사고 감소효과는 제한적일 수밖에 없다. 따라서 중요 시설이나 위험구간에서 차량들의 속도를 일정하게 유지시켜 교통사고 예방효과를 높이기 위한 대안으로 구간과속단속의 필요성이 높아지고 있다. 따라서, 본 연구에서는 우리나라 고속도로에 최초로 도입된 구간과속단속시스템의 효과평가를 위하여 시스템 적용 전 후 교통류특성과 관련된 자료를 수집하여 비교.분석하였고, 그 결과, 시스템 설치 후 속도저감 효과 및 해당 구간의 교통류 안정적 흐름을 보이는 것으로 나타나 구간과속단속 운영구간에 있어서 교통안전성 제고와 교통사고 감소효과가 있는 것으로 파악되었다.

• 대한교통학회지
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• 제23권1호
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• pp.21-32
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• 2005

현행 무인교통단속장비는 특정한 지점에서의 위반 여부를 판단하여 단속하는 특징을 갖고 있어 운전자들이 시스템 설치 지점 앞에서만 속도를 줄이고 통과하자마자 다시 속도를 증가시키는 경향을 보이고 있다. 특히 터널, 교량 및 커브 구간에서의 사고 위험도는 다른 구간에 비해 높은 것으로 분석되고 있다. 따라서 일정구간에 걸쳐 도로나 교통여건으로 과속교통사고의 위험이 높거나 과속사고가 많이 발생되는 도로구간에서 안정적인 속도관리를 위해 구간과속단속시스템의 도입이 필요하다고 판단된다. 본 연구에서는 터널, 교량 구간의 교통류 특성을 분석하여 기존 지점과단속시스템의 한계를 분석하였다. 그리고 구간과속단속시스템을 적용하기 위한 도로구간의 적정거리를 현장 도로구조, 교통여건, 사고발생 내용을 검토하여 제시하였다. 또한 각 교량이나 터널에 대하여 적절한 구간과속단속시스템의 설치 위치를 제시하였다.

• 지구물리와물리탐사
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• 제1권1호
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• pp.19-24
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• 1998

본 논문은 3차원 굴절탄성파 탐사시 얻게 되는 굴절주시를 이용하여 경사진 지층경계면상 속도 분포를 추정하는 방법을 수립코자 수행한 연구를 요약한 것이다. 자료획득은 토모그래피 기법에, 주시 역산은 under-relaxation ART 기법에 의거하였다. 모델은 경사 2층 구조이며, 관련된 매개변수는 지반조사시 만나게 되는 지층을 염두에 두고 선정하였다. 하부 지층에는 수직으로 저속도 혹은 고속도 이상대가 존재하며, 따라서 탐사의 주목적은 이러한 이상대를 탐지하는 것이다. 몇 가지 경우에 대하여 역산을 수행한 결과, 경사 지층 경계면의 경우, 경사 보정을 수행치 않으면 역산 결과는 판독이 어렵거나, 판독하더라도 착오를 일으킬 수 있다는 사실을 확인하였다. 종래 심도 추정을 위한 굴절탄성파 탐사에서, $15^{\circ}$ 이내의 경사지층 경계면을 평균적으로 수평이라고 가정해도 큰 오차가 나지 않는다는 사실을 상기할 때, 앞에 말한 사실은 특이한 일이다.

• Journal of Gastric Cancer
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• 제22권1호
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• pp.35-46
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• 2022

Background: The correlation between hospital volume and postoperative outcomes has led to the centralization of complex procedures in several countries. However, the results reported in relation to gastric cancer (GC) are contradictory. This study aimed to analyze GC surgical volumes and 30-day postoperative mortality in Italy and to provide a simulation for modeling centralization of GC resections based on district case volumes. Methods: A national registry was used to identify all GC resections, record mortality rates, and track the national in-border GC resection health travel. Hospitals were grouped according to caseload. Centralization of all GC procedures performed within the same district was modeled. The outcome measures were a minimal volume of 25 GC resections/year and the 30-day postoperative mortality. Results: In 2018, 5,873 GC resections were performed in 498 Italian hospitals (mean resections per hospital per year: 11.8); the postoperative mortality rate (5.51%) was tracked from 2016-2018. GC resection health travel ranged from 2% to 50.5%, with a significant (P<0.001) difference between northern and central/southern Italy. The mean mortality rate was 7.7% in hospitals performing one to 3 GC resections per year, compared with 4.7% in those with >17 GC resections/year (P≤0.01). Most Italian districts achieved 25 procedures/year after centralization; however, 66.3% of GC cases in southern Italy vs. 42.2% in central and 52.7% in the northern regions (P<0.001) required reallocation. Conclusion: Postoperative mortality after GC resection correlated with hospital volume. Despite health travel, most Italian districts can reach a high-volume threshold, but discrepancies in mortality rates are alarming.Trial RegistrationResearch Registry Identifierresearchregistry6869

• 대한기계학회논문집A
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• 제24권1호
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• pp.134-143
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• 2000

A train performance simulation (TPS) software is a computer program that simulates the operation of a train system over a specified railway route and it is widely used in railroad operation and research applications. Numerical and graphical results from the simulation software, which is developed in this study, provide information on such performance variables as travel time. running speed, energy consumption at a specific time interval and in overall service time as the train moves along the route. Three types of input data are required for a computer simulation: track information, train information, and running conditions. The simulation of train performance starts with several simple mathematical models including train configuration. traction efforts, running resistance. and braking requirements. Based on the basic specifications of Korean High Speed Railway, System. this study, puts a focus on the estimation and assessment of train performance comparing. the specific train configurations of KEST20/11. CPLE20/10. PROP20/10, which are proposed from the previous G7 projects.

• 농촌계획
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• 제19권2호
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• pp.93-105
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• 2013

In recent years, over 100 trails were created in Korea, and Jeju Olle and Jiri Mt. Doolle trail are the most familiar and successful trails in Korea. The research aimed to find relationship between fair tourism and long distance trails. In the first step, we investigated the concept of fair tourism, and deducted 8 key-words; 1)local participation 2)resource sharing 3)provision of unique social, cultural resources 4)sovereignty of local culture 5)small_scale, low impact, eco-friendly 6)sustainable infrastructure 7)revitalize local community 8)comprehensive accommodation of a diverse tourists. Through the analysis of 3 representative sites of long distance trails, we tried to find out the distinct characteristics of fair tourism of the selected sites with evaluating criteria that was provided by UNEP and related organizations. The finding of the study could contribute to defining concept of fair tourism, and by doing so, attribute in setting up a framework of designing and planning of long distance trail under the concept of fair tourism that diverse parties could co-benefit, including local community, local government and tourists.

• Journal of Biosystems Engineering
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• 제26권6호
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• pp.517-524
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• 2001

Steep and narrow ramp installed in the paddy field makes it difficult and sometimes dangerous to drive agricultural machines on it. Because agricultural machinery become larger and heavier, it is necessary to revise design standard for ramp to provide safe travel. This study was conducted to revise the design standard fur paddy field ramp, especially for its width and slope. A mathematical model predicting travelling path of a tractor on paddy field ramp and farm road was developed and simulated. To verify this model, field tests were carried out. The model could predict trvelling path with RMS Error of 12.5cm and 8.2cm, which were judged to be adoptable fur determining the width of paddy field ramp. By applying this model to 110ps tractor, which was assumed to be the largest tractor in Korea, width of paddy field ramp was determined as over 3.6m. The slope of paddy field ramp, which provided tractor with 10% of the total weight of the tractor and the mounted implement as reaction force at front wheel against ground was analyzed by considering weight transfer effect on a ramp. The result showed that adequate slope of paddy field ramp was 14°.

• 한국콘텐츠학회논문지
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• 제14권3호
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• pp.232-240
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• 2014

본 연구에서는 노인들의 관광경험이 삶에 질에 미치는 영향관계를 구조방정식모형을 이용하여 알아보았다. 연구의 조사대상은 제주지역에 거주하는 65세 이상으로 총 209부의 설문 내용이 분석에 활용되었다. 연구 결과, 관광경험은 '가족', '사회', '건강', '심리적', '물질적', '여가' 삶의 영역 만족에 정(+)의 영향을 미치는 것으로 밝혀졌다. 또한, '가족', '건강', '심리적', '여가' 삶의 영역에 만족은 전반적인 삶의 만족에 긍정적인 영향을 미치는 것으로 나타났으나, '사회', '물질적' 삶의 영역 만족은 전반적 삶의 만족에 유의한 영향을 미치지 않는 것으로 밝혀졌다.

• 한국조경학회지
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• 제33권2호
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• pp.1-15
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• 2005

The purpose of this paper is to classify zones disrupting green spaces in city and to evaluate of their grades. The results are as follows; L There were 158 green spaces in Dalsu-gu. The 158 green spaces were classified 4 patterns and minutely classified into 9 types. The area of the 'nature park' type was turned out to be $70.1\%$ of the total area of green spaces in Dalsu-gu, then the type was considered as a important part of the green-network in Dalsu-gu. The 9 types such as 'nature park', 'river', 'neighborhood park' and so on were analysed with ecological indexes. 2. Based on the ecological indexes of 'ratio of the green space', 'features of the surrounding matrix' and 'travel distance of the wildlives' , zones disrupting green spaces were ranging widely and re-divided to 236 sectors. 3. The analysis results for classifying the grades were that grade I appeared over industrial complex and housing complex widely. On the other side, grade II and III appeared around or between nature park and neighboring park Consequently, it was necessary to consider the grade and make zones disrupting green spaces into green space for improving green network.

• 유통과학연구
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• 제10권9호
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• pp.5-11
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• 2012

Purpose - The objective of the paper is to explain both the price sensitivity of international tourists to South Korea and the price sensitivity of Korean tourists to international travel. The study examines long-run equilibrium relationships and Granger causal relationships between foreign exchange rates and inbound and outbound tourism demand in South Korea. Research design/ data / methodology - The study employs monthly time series data from January 1990 to September 2010. The paper examines the long-run equilibrium relationship using the Johansen cointegration test approach after unit root tests. The short-run Granger causality was tested using the vector error correction model with the Wald test. Results - Hypothesis 1 testing whether there is a long-run equilibrium relationship between exchange rates, inbound and outbound tourism demand is supported. Hypothesis 2 testing whether exchange rates lead to a change in touristarrivals and expenditure is not supported. Hypothesis 3 testing whether exchange rates lead to a change in tourist departures and expenditure is supported. Conclusions - The findings of this study show that the impacts of tourism price competitiveness are changing quite significantly with regard to destination competitiveness. In other words, the elasticity of tourism price over tourism demand has been moderated.