• Journal of the Korean Society of Hazard Mitigation
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• v.11 no.3
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• pp.229-235
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• 2011

In order to manage a sewer system effectively, flow conditions such as flux, water quality, Infiltration and Inflow (I/I), Combined Sewer Overflows (CSOs), etc need to be monitored on a regular base. Therefore, in sewer networks, a monitoring is so important to prevent the river disaster. Monitoring all nodes of an entire sewer system is not necessary and cost-prohibitive. Water quality monitoring points that can represent a sewer system should be selected in a economical manner. There is no a standard for the selection of monitoring points and the quantitative analysis of the observed data has not been applied in sewer system. In this study, the entropy method was applied for a sewer network to evaluate and determine the optimal water quality monitoring points using genetic algorithm. The entropy method allows to analyze the observed data for the pattern and magnitude of temporal water quality change. Since water quality measurement usually accompanies with flow measurement, a set of installation locations of flowmeters was chosen as decision variables in this study.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.4D
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• pp.361-368
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• 2010

It is general that mostly congested sections of national backbone networks have been improved based on the national network expansion plan. However, in case of intermodal terminals which are origins of logistics, it is still so congested that travel time between origin and destination is long. Therefore, intermodal transportation systems plan of major intermodal terminals for the intermodal connector networks between intermodal terminal and national backbone network or intermodal terminal was established. With the limitation of priority methodology applying to intermodal connector facility under existing methodology, this study suggests an improved priority methodology. This study includes characteristics of terminal on the hierarchical structure and assessment list, but it does not concentrate on the specific terminal type through survey. To avoid a certain concentration, budget constraint for each terminal type was considered ahead of priority. Finally priority methodology was developed with two-step assessment under consideration that specific terminal is not involved in intermodal connector facility project. As a result of calculating weights by survey, effects such as d/c and accessibility fluctuations index through project implementation gain high weight, and degree of region underdevelopment gets next. Although the methodology in this study could not yields the priority by assessment list, it will be useful for setting the direction on policy related to intermodal connector facility projects.

• Journal of Environmental Impact Assessment
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• v.11 no.1
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• pp.13-23
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• 2002

본 연구에서는 침출수를 비롯한 매립지의 각종 오염물질 배출로 수자원이 오염되어 피폭체의 피해가 빈발하는 문제를 해결하기 위해서, 매립지의 상대적 유해성을 평가하여 한정된 환경관리 예산의 합리적 배분을 위한 우선순위를 결정할 수 있는 의사결정 지원도구로서 LHR(Landfill Site Hazard Ranking)모형을 개발했다. LHR모형은 다요소의사결정(多要素意思決) 기법에 정성적 위해성(危害性) 평가기법을 접맥시켜 주관적 가중치를 모형에 반영한 가치내재화(價値內在化) 모형이다. LHR모형은 피폭체의 주요 피폭경로를 지하수 이동경로와 지표수 이동경로로 보았으며, 각 이동경로별로 누출 가능성, 폐기물 특성 및 피폭체 특성으로 요소범주를 3종류로 구분하여 폐기물의 독성이나 매립량같은 특성이 매립지의 수리지질학적 요소 및 자연지리적 요소에 의해 결정되는 오염물질의 누출 가능성을 통해 매립지 주변의 지역주민과 취약한 수생태계 같은 피폭체에 끼치는 매립지의 유해성을 상대적으로 평가했다. 그리고 LHR모형에서는 매립지 유해성을 공기 이동경로 및 사회경제적 측면에서도 평가하기 위해 매립지 이격거리별 토지이용 형태의 유해성을 평가했다. 그리고 각 평가요소별 가중치는 위계분석과정(位階分析過程)의 쌍대비교법(雙對比較法)에 의하여 할당했으며, 민감도 분석으로 LHR모형을 검증했다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.3
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• pp.467-475
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• 2018

The purpose of this study is to propose the evaluation criteria of asphalt pavement condition in narrow regional road considering the traffic environment in order to reduce road budget of local governments. In general, narrow regional roads are considered relatively less important because they have low travel speed and low traffic volume of heavy-vehicle. Generally, automatic surveying equipment is used for investigations of pavement condition, but the operating costs are not efficient for the narrow regional roads because the cost is too high. This study presents the pavement condition evaluation index suitable for narrow regional roads. In this study, the pavement condition evaluation index is presented considering the traffic environment of narrow regional roads. The pavement condition were classified into three classes based on the crack measured by visual inspection, and the validity of the pavement condition evaluation index presented through the expert's questionnaire survey was examined. Pavement condition for the narrow regional roads was classified into three grades based on the index values calculated by visual inspection. Expert's surveys were conducted to evaluate the validity of the proposed pavement condition evaluation. The proposed evaluation index shows a high correlation with questionnaire survey result ($R^2=0.88$). The proposed evaluation index which is obtained through visual crack inspection under limited conditions can be applied to narrow regional roads. In addition, it is expected that it will be effective not only for road management but also for road management budget by more economical evaluation method of pavement condition.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.188-196
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• 2021

Korea has invested heavily in projects related to national rivers, but there is no evaluation technique and system to manage river projects that can evaluate the effectiveness of the river projects after they are completed. Their absence leads to the inability of information on river construction sections, analysis of project effects, and benchmarking between projects. This may cause over-budget, overlapping investment problems due to the implementation of similar projects in the same section, and incorrect business elements may be repeatedly utilized. In order to solve this shortcoming, this study developed river project evaluation techniques and a river project (construction) management system. The development of evaluation techniques enables comparison and analysis between projects and can be utilized in establishing maintenance plans. The system can also provide inquiry of construction information, visualization of construction, and management of performance items. In this study, the evaluation techniques developed through prior research were modified and supplemented, and the effectiveness was verified by applying them to national river projects in A river and B river. It is expected that the evaluation techniques and system utilization measures presented will increase the work efficiency of river projects and enhance the efficiency of river projects.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.3
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• pp.457-465
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• 2018

This study proposes a novel approach to explore a "travel time budget (TTB)" using a mobile phone signaling data (MPSD), which are passively generated between a mobile phone and a base station. The data analyzied in this study were provided from KT for 8 days (from May 19 to 26 in 2016). They were about 45 million signals passively generated from users whose stay area during night was classified as three areas in Mapo-gu, Seoul and in the city of Sejong. The estmation of TTB was implemented with various pre-processing techniques on the MPSD data in a data-driven analysis. As a result, the TTBs of Mapo-gu, Seoul and Sejong were 82.94 and 80.70 minutes, respectively. The results in this study were also compared with those based on the traditional methods. The authors expect that this result will help transport experts improve the use of MPSD.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.05a
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• pp.115-128
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• 2017

국가연구개발사업은 35개 부처, 약 18.9조 원(미래부 KISTEP, 2016)에 달하며, 이러한 규모의 R&D 활동을 위해 대부분의 국가연구개발사업은 연구관리전문기관에 의한 위탁관리 형태로 추진되고 있다. 위탁관리 형태 중 하나로 볼 수 있는 사업단은 신규 대형 사업의 경우 거의 관행적으로 설립하는 경향이 있어 그 수가 증가 중인 것으로 추정되나, 그나마 드물게 수행되고 있는 국가연구개발사업 관리체계에 대한 조사나 정책 수립은 연구관리전문기관 위주로 이루어지고 있다. 이에 따라 국가연구개발사업에서 주요한 역할을 수행 중인 사업단의 현황과 운영 실태를 파악하고자 사업단의 설립형태와 기능 등 설치현황, 운영비와 인력 등 운영현황, 사업단 운영의 애로사항 등을 조사 분석 하였다. 2014년 기준으로 조사가 가능한 사업단은 모두 63개였으며, 사업단 총 인력규모와 관리하는 사업의 전체 예산 규모는 연구관리혁신협의회 11개 회원 연구관리전문기관 대비 인력규모는 2번째(17.8%), 예산은 5번째(8%) 수준이었다. 사업단의 독립법인 여부, 연구수행 여부 등 형태 기능의 특징은 다양하게 나타났으며, 사업단 기획평가관리비는 평균 5.6억 원으로 사업비 대비 비중의 평균은 6.3% 수준이었다. 사업단 운영의 애로사항으로는 계획된 예산의 적기 지원과 운영비 규정의 혼란 등이 대표적으로 도출되었다. 본고에서는 그간 선행연구와 조사 분석이 거의 이루어지지 않았던 국가연구개발사업 사업단에 대한 기본적인 실태와 현황, 이들이 직면하고 있는 다양한 문제점과 애로사항에 대해 파악하였다. 조사 분석 결과 효과적인 사업단 설립과 운영을 위해서는 적절한 가이드라인과 제도개선이 필요할 것으로 보인다. 다양한 사업단 운영 사례 분석과 연구를 통해 효율적인 사업단 조직체계와 설립형태, 적절한 운영비 제도 등을 제시해 줄 수 있다면 향후 사업단 체제와 대형 국가연구개발사업의 효과적인 추진과 관리에 도움이 될 것이다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.16 no.5
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• pp.29-39
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• 2012

The main objective is to predict the future degradation and maintenance budget for a suspension bridge system. Bayesian inference is applied to find the posterior probability density function of the source parameters (damage indices and serviceability), given ten years of maintenance data. The posterior distribution of the parameters is sampled using a Markov chain Monte Carlo method. The simulated risk prediction for decreased serviceability conditions are posterior distributions based on prior distribution and likelihood of data updated from annual maintenance tasks. Compared with conventional linear prediction model, the proposed quadratic model provides highly improved convergence and closeness to measured data in terms of serviceability, risky factors, and maintenance budget for bridge components, which allows forecasting a future performance and financial management of complex infrastructures based on the proposed quadratic stochastic regression model.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.15 no.1
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• pp.69-89
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• 2004

The purposes of this research are to grasp the actual conditions regarding management of Korean public libraries and to develop the rationalized guidelines for future-oriented policy which should be realized by the government authorities. According to the result of evaluation, it is analyzed that the regional differences of evaluation scores has grown worse, and a chronic problems such as staff shortage, old facilities, lack of budget has been continued repeatedly for 6-years. Moreover the result of evaluation was utilized as a guideline of the policy development on public libraries in the knowledge-based society, based in the evaluation for the management of public libraries in general.

• Journal of the Korean Society for Library and Information Science
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• v.33 no.2
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• pp.45-67
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• 1999

According to the recent survey, it was reported that the public libraries in Korea had seldom conducted the measurement and evaluation of the public library performance. This study, therefore. has investigated the wide range of existing literature on performance measurement and analyzed the different approaches to the problem of measuring public library performance. The performance indicators suggested in this study are 62 indicators and fall into five domains, such as materials, staff resources, user services, facilities, budget and management. Besides, some indicators are suggested to be used in cases where a more detailed examination is required - usually when measuring the performance of an individual library.