• 한국지리정보학회지
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• 제18권2호
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• pp.75-91
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• 2015

본 연구의 목적은 유시티의 진화지도를 통하여 유시티 진화 특성을 분석하는데 있다. 유시티 진화 특성은 서비스, 기술, 인프라, 관리 등으로 구성된 STIM 모형의 관점에 따라 부문별 진화지도를 구축하여 분석하였다. 분석자료는 2002년부터 2013년까지 한국정보사회진흥원에서 발간한 국가정보화백서를 활용하였다. 분석 결과는 다음과 같다. 첫째, 유시티 서비스는 행정 정보화 서비스, 기업 정보화 서비스, 행정 생활 정보화 서비스, 행정 공간 민간 정보화 서비스로 진화되었다. 둘째, 유시티 기술은 유선 네트워크, 센서 네트워크, 프로세싱 초고속 네트워크, 네트워크 및 보안, 융합기술 등으로 진화하였다. 셋째, 유시티 인프라는 유선 네트워크, 유 무선네트워크, 지능화시설(1990년대 후반), 지능형 시설 공간(2000년대 초반)으로 진화되었다. 넷째, 유시티 관리는 단위 네트워크 인프라 관리, 정보연계 및 운영 관리, 정보통합 및 참여운영 관리 등으로 진화 되었다. 따라서 유시티는 행정 중심의 정부 정보화, 기술 중심의 컴퓨터 지향 사회, 서비스 중심의 정보화 도시, 공간 중심의 유시티로 진화되었음을 알 수 있다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 가을 학술발표회 논문집
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• pp.527-534
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• 2000

136 cut slopes which extends from Namyangju to Chunchon city along the 46th national highway were investigated to analyze the influence factors affecting slope instability. Geologic and geotechnical conditions were examined and the detailed investigation were carried out for fifty five failed slopes. failure mode (wedge failure, planar failure, circular failure, sheet eroison and rock falls) are examined with respect to slope inclination, rock type, weathering grade and discontinuity patterns. It is suggested that the failure modes and their dimensions have relations to the morphology and geologic conditions of the slopes. Wedge failure has highest is the most frequent failure mode and falls, sheet erosions, planar failures and circular in descending order of failure percentage. Wedge failure is most dominant failure type over all lithology except quartzite formation. In slopes of well foliated and banded gneiss, failure ratio of wedge is up to 50% ca. Failure ratio(number of rock fall/number of total failure) of rock fall increases with increase fo slope inclinations and decrease of weathering grade. Dimension analyses of failed slopes shows wedge and circular failure has higher value of D/L and D/H than planar failure and sheet erosion.

• Earthquakes and Structures
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• 제2권2호
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• pp.189-206
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• 2011

In this study, the subspace stochastic realization theories (SSR model I and SSR model II) have been applied to a real bridge for estimating its dynamic characteristics (natural frequencies, damping constants, and vibration modes) under ambient vibration. A numerical simulation is carried out for an arch-type steel truss bridge using a white noise excitation. The estimates obtained from this simulation are compared with those obtained from the Finite Element (FE) analysis, demonstrating good agreement and clarifying the excellent performance of this method in estimating the structural dynamic characteristics. Subsequently, these methods are applied to the vibration induced by both strong and weak winds as obtained by remote monitoring of the Kabashima bridge (an arch-type steel truss bridge of length 136 m, and situated in Nagasaki city). The results obtained with this experimental data reveal that more accurate estimates are obtained when strong wind vibration data is used. In contrast, the vibration data obtained from weak wind provides accurate estimates at lower frequencies, and inaccurate accuracy for higher modes of vibration that do not get excited by the wind of lower intensity. On the basis of the identified results obtained using both simulated data and monitored data from a real bridge, it is determined that the SSR model II realizes more accurate results than the SSR model I. In general, the approach investigated in this study is found to provide acceptable estimates of the dynamic characteristics of highway bridges as well as for the vibration monitoring of bridges.

• 한국조경학회지
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• 제32권3호
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• pp.32-42
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• 2004

This study aims at establishing an ecological planning for road construction. which is considered to be a main cause of damage to the natural environment in Korea. This study focuses on the Pyungtak-Eumsung Highway development project. It considers the ecological factors and status of the site and its surrounding area. The study site is a four-way highway with a width of 23.4m and a length of 5.7km that spans from Hyungok-ri, Anseong City, Kyeonggi Province to Jukhyun-ri, Jincheon-gun, Chungbuk Province. The objective of the plan is "the establishment of an eco-road in harmony with nature." The plan is divided into five detailed goals: 1) restoration of river morphology and ecosystem through ecological planning; 2) establishment of wet biotopes; 3) construction of ecological corridors; 4) restoration of damaged forest ecosystems; and 5) ecological restoration of the roadside slopes that are linked with the surrounding forest. A master plan has been developed based on the detailed goals. The master plan involves: 1) establishment of a natural river, wet biotopes, and ecological corridors that facilitate the movement of amphibians, wild fowls, mammalians and fish; 2) development of a planting plan for the visitor center, the tunnel entrance, and soundproof banks; and 3) the presentation of a planting model for restoring roadside slopes that are connected to the surrounding forest. The eco-road plan needs to entail ecological conservation and restoration plans. In addition, a monitoring plan for ecological corridors and habitats should be included in the comprehensive plans, along with the continuous development of environmentally friendly technologies.

• 한국융합학회논문지
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• 제10권5호
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• pp.239-248
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• 2019

본 연구는 고속도로휴게소 종사자의 직무스트레스에 따른 음악활용을 알아보기 위해 U시와 G도에 소재한 고속도로휴게소 종사자 150명을 대상으로 조사연구를 실시하였다. 음악활용 25문항, 직무스트레스 24문항, 개인변인 4문항, 총 53문항으로 구성한 150부의 설문지를 배포한 후, 회수한 140부 중 불충분한 6부를 제외한 총 134부를 분석하였다. 그 결과 첫째, 고속도로휴게소 종사자는 음악감상을 노래부르기나 악기연주에 비해 선호하였으며, 주로 혼자 집에서 대중음악을 감상하는 것으로 나타났다. 둘째, 음악활용 목적은 기분전환, 편안함, 즐거움, 해소감, 활력감 순으로 나타났다. 셋째, 직무스트레스에 따른 고속도로휴게소 종사자의 음악활용은 전반적인 차이를 보이지 않았으나, 선호 음악 분위기와 음악을 통해 해소감을 얻는 정도가 유의하게 다른 것으로 조사되었다. 이는 고속도로휴게소 종사자의 요구와 필요에 맞는 효과적인 음악융합 프로그램 개발에 기초자료를 제공할 수 있을 것이다.

• 한국전자통신학회논문지
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• 제15권6호
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• pp.1123-1130
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• 2020

본 연구는 고속도로 교통사고 심각도 예측모델을 구축하기 위해 다섯가지 머신러닝 기반의 분류모형 적용하였다. 2015년~2017년 동안 전국 고속도로에서 발생한 사고 데이터 21,013건을 5가지의 분류 모형을 적용한 결과 LightGBM(Light Gradient Boosting Model)이 가장 좋은 성능을 나타내는 것으로 나타났다. LightGBM에서는 교통사고심각도 추정에 있어 우선순위 요인으로 사고차량 수, 사고유형, 사고지점, 사고차로유형, 사고차량 유형 순으로 나타났다. 이러한 모형의 결과를 기반으로 일관적인 사고심각도 예측 과정을 통하여 교통사고대응관리 전략 수립에 활용할 수 있다. 본 연구는 국내 기계학습을 활용한 사례가 적은 여건에서 향후 빅데이터 기반의 다양한 기계학습 기법을 활용이 가능함을 제시하고 있다.

• 한국정보시스템학회지:정보시스템연구
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• 제29권2호
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• pp.131-147
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• 2020

Purpose The purpose of this study is to develop intelligent vehicle parking distribution system based on LoRa network at the circumstance of traffic congestion during cultural festival in a local city. This paper proposes a parking dispatch and distribution system using a Q-learning algorithm to rapidly disperse traffics that increases suddenly because of in-bound traffics from the outside of a city in the real-time base as well as to increase parking probability in a parking lot which is widely located in a city. Design/methodology/approach The system get information on realtime-base from the sensor network of IoT (LoRa network). It will contribute to solve the sudden increase in traffic and parking bottlenecks during local cultural festival. We applied the simulation system with Queuing model to the Yudeung Festival in Jinju, Korea. We proposed a Q-learning algorithm that could change the learning policy by setting the acceptability value of each parking lot as a threshold from the Jinju highway IC (Interchange) to the 7 parking lots. LoRa Network platform supports to browse parking resource information to each vehicle in realtime. The system updates Q-table periodically using Q-learning algorithm as soon as get information from parking lots. The Queuing Theory with Poisson arrival distribution is used to get probability distribution function. The Dijkstra algorithm is used to find the shortest distance. Findings This paper suggest a simulation test to verify the efficiency of Q-learning algorithm at the circumstance of high traffic jam in a city during local festival. As a result of the simulation, the proposed algorithm performed well even when each parking lot was somewhat saturated. When an intelligent learning system such as an O-learning algorithm is applied, it is possible to more effectively distribute the vehicle to a lot with a high parking probability when the vehicle inflow from the outside rapidly increases at a specific time, such as a local city cultural festival.

• 한국도로학회논문집
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• 제18권5호
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• pp.105-115
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• 2016

PURPOSES : This study was initiated to analyze the characteristics of bus traffic accidents, by bus types, using the decision tree in order to establish customized safety alternatives by bus types, including the intra-city bus, rural area bus, and inter-city bus. METHODS : In this study, the major elements involved in bus traffic accidents were identified using decision trees and CHAID algorithm. The decision tree was used to identify the characteristics of major elements influencing bus traffic accidents. In addition, the CHAID algorithm was applied to branch the decision trees. RESULTS : The number of casualties and severe injuries are high in bus accidents involving pedestrians, bicycles, motorcycles, etc. In the case of light injury caused by bus accidents, different results are found. In the case of intra-city bus accidents, the probability of light injury is of 77.2% when boarding a non-owned car and breaching of duty to drive safely are involved. In the case of rural area bus accidents, the elements showing the highest probability of light injury are boarding an owned car, vehicle-to-vehicle accidents, and breaching of duty to drive safely. In the case of intra-city bus accidents, boarding owned car, streets, and vehicle-to-vehicle accidents work as the critical elements. CONCLUSIONS : In this study, the bus accident data were categorized by bus types, and then the influential elements were identified using decision trees. As a result, the characteristics of bus accidents were found to be different depending on bus types. The findings in this study are expected to be utilized in establishing effective alternatives to reduce bus accidents.

• 한국환경과학회지
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• 제16권12호
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• pp.1393-1399
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• 2007

This research helps you understand the road traffic noise levels by using a noise map. We have observed the change of the road traffic noise levels around $07:00{\sim}08:30\;and\;22:00{\sim}23:00$ using the noise map in the city. The road traffic noise level is very high both at noon and at night around a beltway and an interchange that is linked with a highway. It seems that the main route of so many vehicles, which are at neighboring cities such as N city and D and H districts and which avoid traffic jams in the city, is the beltway and interchange. The road traffic noise level of a nearby express bus terminal, railroad station, and airport is more than 75 dB at noon and 65 dB at night. The road traffic noise level of G city at night is observed to be more than 55 dB. The noise levels of a residence area and a university are higher than a road with high noise levels when the commuters drive to work. The end of the day exceeds 11 o'clock because of a culture level of development that arouses spare time, eating out, adults' drinking culture, nightlife of the youth, etc. Therefore, the road traffic noise level is high during late night hours, and it exceeds regulatory guidelines(55 dB(A)). It also damages the residence area that is located near the road.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.1130-1137
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• 2022

The Industry Foundation Classes (IFC) provides standardized product models for the building construction domain. However, the current IFC schema has limited representation for infrastructure. Several studies have examined the data schema for road and highway modeling, but not in a sufficiently comprehensive and robust manner to facilitate the overall integrated project delivery of road projects. Several discussions have focused on slope engineering for road projects, but no solution has been provided regarding the formalized parametric modeling up to now. Iterative design, analysis, and modification are observed during the process of slope design for road projects. The practitioners need to carry out the stability analysis to consider different road design alternatives, including horizontal, vertical, and cross-section designs. The procedure is neither formalized nor automated. Thus, there is a need to develop the formal representation of the product and process of slope analysis for road design. The objective of this research is to develop a formal representation (i.e., an IFC extension data schema) for slope analysis. It consists of comprehensive information required for slope analysis in a structured manner. The deliverable of this study contributes to both the formal representation of infrastructure development and, further, the automated process of slope design for road projects.