• Journal of Korea Water Resources Association
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• v.41 no.2
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• pp.127-135
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• 2008

The objective of sewer rehabilitation is to improve its function while eliminating inflow/infiltration (I/I) and insufficient carrying capacity (ICC). Such rehabilitation efforts, however, have not been particularly successful due to a lack of sewer data and unsystematic field practices. The present study aimed to solve these problems by developing a decision making model consisting of two models: the rehabilitation weighting model (RWM) and the rehabilitation priority model (RPM). In RWM, the I/I of each pipe in a drainage district is estimated according to various defects, with each defect given an individual weighting factor using an analytic hierarchy process (AHP). RPM determines the optimal rehabilitation priority (ORP) using a genetic algorithm (GA). The developed models can be used to overcome the problems associated with unsystematic practices and, in practice, as a decision making tool for urban sewer system rehabilitation.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.3
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• pp.649-664
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• 2015

Recently, the risk of security incidents has been increased due to change of IT environment and development of new hacking methods. Event study methodology that measures the effect of a specific security incident on the stock price is widely adopted to analyze the damage cost of security incidents on market value. However, analysis of company's temporary stock price change is limited to immediate practical implication, and reputation loss should be considered as a collateral damage caused by security incidents. We analyzed 52 security incidents of listed Korean companies in the last decade; by refining the criteria presented by Tobin's q, we quantitatively showed that the companies has significantly higher reputation loss due to security loss than the other companies. Our research findings can be used in order that the companies can efficiently allocate its resource and investment for information security.

• Korean journal of applied entomology
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• v.13 no.4 s.21
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• pp.251-253
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• 1974

Grain losses due to rodents are annually estimated to be about twenty percent of the whole grain production in Korea. The brown rat (Rattus norvegicus), the roof rat (Rattus rattus), the house mouse (Mus musculas) and the striped fold mouse (Apodemus agrarius) are primary species among eleven species found in the country. Rodent control has been conducted by the government since 1962. As for the poison. anticoagulant was used at first, but no satisfactory results were obtained due to limited funds, Since 1970, zinc phosphide has been introduced for the national campaign, but the degree of efficiency have been decreased year by year becaue of increased poison shyness. In order to overcome this problem, the author has improved 2inc phosphide effectiveness by the microcapsuling method with paraffin wax which increase intake of poison by masking the taste and delaying the onset of symptom. This method can be used efficiently for national campaign in future. However, more attention to this problem, more resarch, training and funding are required for the development of rodent control in Korea.

• Journal of Korea Water Resources Association
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• v.42 no.3
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• pp.177-190
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• 2009

Rehabilitation projects for old water mains typically require considerable capital investments. One of the economical ways of pursuing the rehabilitation projects is to focus on a specific area within the entire region under management. In this paper the hierarchical clustering methods that analyze spatial inter-relationship of location data are applied to about 8,000 water leak location data recorded in a case study area from 1992 to 1997. Among the hierarchical clustering methods Single, Complete, and Average Linkage Methods are used to identify clusters of the water leak locations and to divide the area according to the defined clusters. By comparing the clusters identified by the clustering methods, the best clustering method for the case study area is suggested. Prioritization of the area for maintenance is obtained based on the water leak incident intensity for the clustered area using the suggested best clustering method.

• Journal of Gifted/Talented Education
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• v.26 no.4
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• pp.635-652
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• 2016

This study investigated operation plan for the Cyber Bridge Program based on the survey from teachers of science high schools. Teachers were found to be thinking it positive that cyber programs can be operated free from the time and spatial restrictions. They thought that teacher interactions are hard to occur and teachers' role in learning is limited as well. Also, the geographical, physical, and socio cultural minorities might have benefits from cyber programs either as regular programs or the before entrance programs. Therefore, the detailed plans are needed. Most of all, since the educational contents are the key for the programs, we suggested some contents categories and developmental criteria. As a result, the developments of high quality contents and financial supports for the successful Cyber Bridge Program are essential.

• Journal of Information Technology and Architecture
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• v.11 no.2
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• pp.143-155
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• 2014

In recent years, domestic electronics, banking, electricity, services, manufacturing, pharmaceutical, corporate type and malicious hackers is corporate security through the accident occurred and the resulting loss of corporate information and the damage each year is steadily increasing. Many companies have responded to domestic business activities and to protect critical information related to laptops, smart phones, tablets, and introduced a variety of Endpoint security solutions within. However, being introduced to senselessly Endpoint security solution across the over-budget, with the same features and performance, such as conflicts and problems arise, resulting in additional maintenance costs, in an effort to resolve the conflict in the operational security of the IT department's new difficulty in becoming. Here is the introduction and operation of these Endpoint security solutions in order to solve the problem on employees's PC into the center of the information security governance based on Endpoint security solution to provide the process for determining the solutions presented.

• Journal of Korean Society of Transportation
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• v.20 no.7
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• pp.69-76
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• 2002

In conducting studies related to the national base networks, it is very important to construct a simulation network. This research provides an algorithm to construct the simulation network from the digital transportation map which is constructed based on the National Geographic Information System(NGIS). The algorithm consists of three functions(extraction of networks from transportation digital map, transform of the derived network into one suitable to transportation simulation model, and inspection of errors in the network). The direct derivation of a simulation network from GIS enables to enhance the reliability of an analysis related to a transportation facility investment as well as to reduce cost and time. In this research, Emme/2 which is generally accepted transportation planning fields is adapted for the target system. However, this algorithm will be extended to other simulation models such as Satong-Paldal which is the only transportation simulation model developed in Korea, and Tranplan in the near future.

• Journal of Korean Society of Transportation
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• v.31 no.5
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• pp.79-88
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• 2013

Recently, due to THE MOBILITY ENHANCEMENT FOR THE MOBILITY IMPAIRED ACT, local governments have tired to make various efforts on special transport services(STS), low-flow bus, and installing elevator in subway stations for handicapped people. But in case of STS, insufficient numbers of taxi are raised against the increasing demand of hadicapped people due to the limited budget. This study investigated actual use condition of STS and characteristics of selection of handicapped people on Duribal. In addition, an ordered-logistic model was employed for developing taxi use prediction model considering taxi fare discounts for diverting Duribal demands to taxies. The results can be a significant basic data for transportation policies to improve travel efficiency of the handicapped.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.22 no.3
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• pp.269-288
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• 2011

Acquisition processes in public libraries, especially as influenced by policies and regulations both in national and regional levels have not been in the main area of concerns in the research of library and information science. While the area of collection management has yet been one of the major issues in this filed, public library book-purchasing in the major factor to achieve effective library collections. This study concentrated on the policies and regulations that attempts to normalize and control the acquisition process in public libraries. This research analyzed and investigated (1) various policies and regulations regarding the library collection as public procurement, (2) legitimacy of decision between normal price procurement and discounted price contract under the current policy on normal retail price of books, (3) budget allocation, (4) policies on library acquisition processes. Suggestions are also added for the efficient collection building in public libraries.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.452-452
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• 2018

최근에는 지구온난화의 영향으로 집중 호우, 가뭄 등 기상 이변이 빈번하게 발생하고 있어서 물 관리의 복잡성과 불확실성이 매우 높아지고 있다. 특히 중소하천은 하천의 경사가 급하고 하천길이가 짧아 홍수파의 이동시간이 짧기 때문에 홍수대비를 위한 시간이 매우 짧다. 국회예산정책처(2012)에 따르면 과거 5개년간(2007~11) 발생한 자연재해 피해 중 87%가 집중 호우 및 태풍에 의한 피해이며, 이 중 98.7%가 중 소규모 하천에서 발생하였다. 그러나, 중소하천 관리를 담당하는 지자체는 열악한 재정 여건으로 인해 예방보다 사후복구에 집중할 수밖에 없는 상황이다. 또한 최근 하천 고수부지에 주차장, 위락시설 등 공간적 활용이 증가함에 따라 홍수발생시 위험성도 증가하고 있어 예방 및 대응 중심의 홍수대응기준 수립이 시급하다. ICT 인프라를 이용하여 유관기관의 실시간 수문자료를 공유하고, 수집된 실시간 수문자료를 활용한 홍수분석 및 홍수대응 기준 대응기준 수립을 통한 예방적 재난대응 체계를 마련해야 한다. 이에 본 연구에서는 A지자체를 대상으로 홍수분석 모형을 구축하고, 구축된 모형의 계산결과를 활용하여 예상강우별 도달시간, 수위상승 등을 예측하고, 하천수위별 홍수대응기준을 수립하였다. 수위별 대응기준은 현장에서 계측되는 수위값을 기준으로 홍수예보기준, 하천기본계획의 제방고 및 주변 제약 사항을 고려하여 직접알람 기준으로 활용하였다. 특히 A지자체는 상류에 B댐이 위치하여 홍수시 B댐 수위 및 운영의 영향을 반영하는 홍수대응기준의 수립이 요구된다. 본 연구에서는 강우 시나리오별 모형분석을 통하여 예상되는 호우사항에 대한 홍수대응기준을 제시하였다. 향후 본 연구로 산정된 홍수대응기준의 지속적인 보완, 실시간 수문자료 공유체계 확대, 재해관련 책임기관과의 유기적인 기술교류 등을 통해 지자체 및 중소하천 홍수피해 저감을 위한 능동적인 홍수대응 체계 구축이 수행되어야 할 것이다.