• The Journal of the Convergence on Culture Technology
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• v.9 no.4
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• pp.473-478
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• 2023

The construction business has a high accident rate among all the industries, and it accounts for 68% of the total accident rate for the small and medium-sized construction sites where a safety manager is not appointed,. Thus, through effective safety management and education of the construction sites, the accident rate can be significantly reduced. This study proposed a plan to improve the system suitable for small and medium-sized construction sites by integration with the basic safety & health education system. Through previous research and survey, the improvement points of special safety & health education at small and medium-sized construction sites, and the preference for integration with basic safety & health education were analyzed.

• The Journal of Bigdata
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• v.7 no.2
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• pp.139-152
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• 2022

Engineering's work area for plants is a technical area that directly affects productivity, performance, and quality throughout the lifecycle from planning, design, construction, operation and disposal. Using the different types of data that occur to make decisions is important not only in the subsequent process but also in terms of cyclical cost reduction. However, there is a lack of systems to manage and analyze these integrated data. In this paper, we developed a knowledge base-based plant engineering analysis platform that can manage and utilize data. The platform provides a knowledge base that preprocesses previously collected engineering data, and provides analysis and visualization to use it as reference data in AI models. Users can perform data analysis through the use of prior technology and accumulated knowledge through the platform and use visualization in decision-support and systematically manage construction that relied only on experience.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.222-222
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• 2022

최근 기후변화로 인해 지역 및 시기별로 강수량이 편중되면서 가뭄(0.72회/년) 등 물 관련 재해가 빈번하게 발생하고 있으며, 가뭄의 강도 또한 심화되는 추세이다. 본 연구대상 지역인 태안군과 괴산군의 경우 기후변화 시나리오(RCP 4.5)를 적용, 미래(~2100년) 기상조건에 대하여 기존 농업용 저수지의 용수공급능력을 평가한 결과, 가뭄대응(내한) 능력이 감소하는 것으로 분석되었다. 한편, 농업가뭄의 경우 주로 영농기에 발생하여 장마가 시작되면서 해소되었으나, 최근 기후변화로 인해 지속기간이 점차 증가하여 가뭄피해가 매년 반복되고 있다. 그러나, 현재까지 추진된 가뭄대책의 경우 관정개발, 저수지 준설 등 단기·사후처방 중심의 대책이 마련되어 지속적인 재해관리와 예방에 많은 어려움을 겪고 있다. 이에 본 연구에서는 지역 맞춤형 가뭄대응 종합대책을 마련하여 기후 변화대비 안정적인 영농기반을 구축하고자 하였다. 기존시설 개선, 수요관리 등 최근 정부정책 방향과 재원조달 방안을 고려, 법적근거(농어촌정비법 등)에 의한 실현 가능한 사업계획을 수립하는 한편, 다목적 농촌용수 개발, 용수이용체계 재편 등 사업유형을 구분한 후 단계별(장·단기) 가뭄대책을 마련하였다. 가뭄대책 수립 시 한국농어촌공사에서 개발한 '수리수문 설계 시스템(K-HAS)'을 이용하여 용수 수요량을 산정하였고, 기존 수리시설물별 물 수지 분석을 통해 여유수량이 확보된 수원을 최대한 활용코자 하였다. 저수지 개발 등 신규 수자원 확보가 용이한 내륙·산간지역의 경우 중·대규모 저수지(유효저수량 1백만m³, 유역면적 200ha이상) 개발계획을 수립하는 한편 지역특성(형상, 표고차 등), 개발여건 및 경제성 등을 고려하여, 적정 개발범위(수혜면적 20ha이상)을 설정하였다. 한편, 신규 수자원개발이 어려운 도서·해안지역의 경우 용수 재이용(회귀수 활용) 및 담수호 내 염해방지시설을 도입하는 등 지역 맞춤형 가뭄대책을 수립하였다. 본 연구에서 제시한 단계별(장·단기) 가뭄대책이 차질없이 시행될 경우 기후변화 대비 안정적인 농업용수공급이 가능하고, 상습가뭄 발생(물 부족) 지역에 대하여 효율적이고 합리적인 물(수요·공급)관리가 가능할 것으로 기대된다.

• Journal of Korean Society of Transportation
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• v.20 no.3
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• pp.17-30
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• 2002

Incident duration prediction is one of the most important steps of the overall incident management process. An accurate and reliable estimate of the incident duration can be the main difference between an effective incident management operation and an unacceptable one since, without the knowledge of such time durations, traffic impact can not be estimated or calculated. This research presents several multiple linear regression models for incident duration prediction using data consisting of 384 incident cases. The main source of various incident cases was the Traffic Incident Reports filled out by the Motorist Assistant Units of the Korea Highway Corporation. The models were proposed separately according to the time of day(daytime vs. nighttime) and the fatality/injury incurred (fatality/injury vs. property damage only). Two models using an integrated dataset, one with an intercept and the other without it, were also calibrated and proposed for the generality of model application. Some findings are as follows ; ?Variables such as vehicle turnover, load spills, the number of heavy vehicles involved and the number of blocked lanes were found to significantly affect incident duration times. ?Models, however, tend to overestimate the duration times when a dummy variable, load spill, is used. It was simply because several of load spill incidents had excessively long clearance times. The precision was improved when load spills were further categorized into "small spills" and "large spills" based on the size of vehicles involved. ?Variables such as the number of vehicles involved and the number of blocked lanes found not significant when a regression model was calibrated with an intercept. whereas excluding the intercept from the model structure signifies those variables in a statistical sense.

• Journal of the Korean Institute of Landscape Architecture
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• v.45 no.6
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• pp.1-9
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• 2017

This study investigates the environmental factors of endemic species in Korea in order to understand their ecological characteristics, and to investigate the target species of their natural habitats to find similar sites. The purpose is to restore and follow suitable growth methods for the appropriate highway facility of target species to establish a management system via monitoring. This study endeavors to restore the target species near highway facilities on the basis of monitoring data and restore sites have similar natural characteristics of the target species. After restoring the target species, a restoration strategy and management plan will be established for breeding and continuation. The restoration strategy and management plan of the target species is divided into breeding, restoring, maintaining and monitoring plans. Specially management plans include several divisions such as soil, water, non-point pollution source reduction and naturalized plants. The results of this study can be used as reference materials for the restoration of endemic Korean plants in the future of highway routes, and for systematic management measures in habitats.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.777-785
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• 2021

Many utility lines are buried underground to provide various functions of the city. Because historical records are not managed systematically, damage has occurred during excavation. In addition, the demand for an underground facility management system is increasing as the aerial underground project is progressing. By attaching an electronic recognition sensor to an underground facility, such as pipelines, the management history and site conditions can be carefully managed. Therefore, in this study, electronic recognition sensors, such as BLE Beacon, UHF RFID, geomagnetic sensor, and commercial marker, were tested to analyze the strengths, weaknesses, and field applicability through a pilot project. According to the limited research results collected through two pilot projects, the installation depth is most important to demonstrate the performance of the electronic reader. In addition, because it should be used in urban areas, the influence of environmental interference should be minimized, and there should be no performance degradation over time. In the case of the geomagnetic recognizer, the effect of environmental interference was large, and performance degradation occurred over time using the BLE Beacon. In the field situation, where the installation depth can be controlled to less than 40cm, the utility of the battery-free UHF RFID was the best.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.743-743
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• 2012

최근 국내에서는 저탄소 녹색도시 조성의 일환으로 도시의 환경오염과 기후변화의 문제의 원인이 되고 있는 탄소 배출을 억제하고 고유가 시대에 에너지저감을 동시에 고려하는 저탄소 도시 조성을 통해 기후변화 시대에 대응을 추진하고 있다(국토해양부, 2009). 이러한 결과로 최근 도시내 물순환시스템(urban water circulating system or blue-network)의 구축이 요구되며 이는 자연의 생태 기능을 복원하고 오염부하를 저감하여 도시 환경의 건강성과 지속성 향상에 기여한다. 이러한 도시물순환시스템은 시민의 휴식 및 문화 공간, 도심열섬현상 완화, 재해방지, 생물서식공간(biotope) 제공 등의 기본적인 기능 이외에도 탄소배출 감소, 우수 저류공간 확보, 지하수위 유지, 비상용수 확보, 대기오염물질의 집진제거, 습지보전 및 생물종 다양성 확보 등의 주요 기능을 수행할 수 있기 때문에 구도심의 재개발 또는 신도시 개발 시 도시 어메니티(amenity) 증진에 널리 적용되고 있다(서울시정개발연구원 2003; 한국토지공사 2003). 남한산성을 포함하는 청량산 계곡수를 발원지로서, 공간적 범위는 장지천과 창곡천을 따라 약 3.5 km 서쪽으로 흘러 탄천에 이르기까지의 물길축(blue-network)를 기반으로 하며 총면적은 $6.8km^2$ 으로 서울, 성남, 하남의 3개 행정구역에 걸쳐있다. 내용적 범위는 현황조사(개발 컨셉, 하천분포현황, 인접지역 연계, 수질), 수량 및 수질 확보방안(물수지분석, 다중 수원 확보방안, 목표수질 설정, 부영양화 가능성 평가), 물순환시스템 구축(소하천 등과 연계 방안), 유지관리 방안의 순서로 진행하여 기본계획을 도출하였다. 현황조사 결과 본 사업대상지는 장지천, 창곡천, 학암천 등 3개 소하천이 서쪽의 탄천과 연결되어 있으며 동쪽은 산지로 청량산이 인접하기에, 주변 자연지형을 최대한 고려하여 물순환시스템을 계획하였다. 하천 유량은 기존 환경영향평가서, 하천 연계방안, 신도시 조성 관련기준 등을 종합적으로 고려하여 하류에서 각각 장지천 $10,087m^3/d$, 창곡천 $7,103m^3/d$, 복우천 $5,530m^3/d$ 의 유지용수량을 산정하였다. 도시 친수공간 확보와 어메니티 향상을 위해 지구내 수로(휴먼링)을 조성하여 장지천, 창곡천과 연계하였으며 주요 유지용수는 저탄소 녹색도시 건설에 부합하도록 우수을 활용한 함양지 및 계곡수로 조성 계획하였다. 또한, 인접한 장지천 및 창곡천 등 소하천은 지속적인 유량공급 및 양질의 수질을 확보하기 위해서 하상여과수를 검토 후 제안하였다.

• Journal of the Korean Institute of Landscape Architecture
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• v.48 no.4
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• pp.41-54
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• 2020

This study was conducted to provide basic data for a transparent and fair bidding system by identifying problems and suggesting improvement measures through an analysis of the bidding status for construction projects and service-related landscaping of multi-family housing. To this end, we used the data from the "Multi-Family Housing Management Information System (K-apt)" that provides the history of apartment maintenance, bidding information, and the electronic bidding system to examine the winning bid status and amount, along with the size and trends of the winning bids by year, and the results of the selection of operators by construction type. As a result, it was found that out of the total number of successful bids (36,831), 4.4% (16,631) were in the landscaping business, and the average winning bid value was found to be about 24 million won. According to the data, 73% of the landscaping cases were valued between 3 million won and 30 million won, and 58.6% of the cases were in the field of "pest prevention and maintenance". 36% of the total number of bids were awarded from February to April, with "general competitive bidding" accounting for 59.8% of the bidding methods. As for the method of selecting the winning bidder, 55% adopted the "lowest bid" and "electronic bidding method," and 45% adopted the "qualification screening system" and "direct bidding method." As an improvement to the problems derived from the bidding status data, the following are recommended: First, the exception clause to the current 'electronic bidding method' application regulations must be minimized to activate the electronic bidding method so that a fair bidding system can be operated. Second, landscaping management standards for green area environmental quality of multi-family housing must be prepared. Third, the provisions for preparing design books, such as detailed statements and drawings before the bidding announcement, and calculating the basic amount shall be prepared so that fair bidding can be made by specifying the details of the project concretely and objectively must be made. Fourth, for various bidding conditions in the 'business operator selection guidelines', detailed guidelines for each condition, not the selection, need to be prepared to maintain fairness and consistency. These measures are believed to beuseful in the fair selection of landscaping operators for multi-family housing projects and to prepare objective and reasonable standards for the maintenance of landscaping facilities and a green environment.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.6A
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• pp.799-808
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• 2008

The analysis of vehicular loads reflecting the domestic traffic circumstances is necessary for the development of adequate design live load models in the analysis and design of cable-supported bridges or the development of fatigue load models to predict the remaining lifespan of the bridges. This study intends to develop an ANN(artificial neural network)-based Bridge WIM system and Influence line-based Bridge WIM system for obtaining information concerning the loads conditions of vehicles crossing bridge structures by exploiting the signals measured by strain gauges installed at the bottom surface of the bridge superstructure. This study relies on experimental data corresponding to the travelling of hundreds of random vehicles rather than on theoretical data generated through numerical simulations to secure data sets for the training and test of the ANN. In addition, data acquired from 3 types of vehicles weighed statically at measurement station and then crossing the bridge repeatedly are also exploited to examine the accuracy of the trained ANN. The results obtained through the proposed ANN-based analysis method, the influence line analysis method considering the local behavior of the bridge are compared for an example cable-stayed bridge. In view of the results related to the cable-stayed bridge, the cross beam ANN analysis method appears to provide more remarkable load analysis results than the cross beam influence line method.

• Journal of the Society of Disaster Information
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• v.15 no.4
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• pp.459-468
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• 2019

Purpose: The cavity exploration of the lower part of the road is carried out to prevent ground-sinking. However, the detected communities cannot be identified by the cavity location and history information, such as repackaging the pavement. Therefore, the field applicability of RFID systems was evaluated in this study to enable anyone to accurately identify information. Method: During temporary recovery, tag recognition distance and recognition rate were measured according to underground burial materials and telecommunication tubes using RFID systems with electronic tag chips attached to the bottom of the rubber cap. Result: The perceived distance and perceived rate of depth for each position of the electron tag did not significantly affect the depth up to 15cm, but it did have some effect if the depth was 20cm. In addition, water effects from nearby underground facilities and rainfall are relatively small, and the effects of wind will need to be considered during the weather conditions of the road. Conclusion: The RFID tags for field application of the pavement management system store various information such as location and size of cavity, identification date, cause of occurrence, and surrounding underground facilities to maximize cavity management effect with a system that can be computerized and mobile utilization.