• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1525-1530
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• 2008

최근의 기상이변 및 집중호우 등에 대응하기 위해 기존 다목적댐 상류지역에 대한 홍수를 저감시키고, 용수공급, 퇴사 및 탁수저감, 부유물 차단 및 레크레이션 등 기존댐의 효용 증진과 그 가치를 제고하기 위하여 다목적댐 상류에 소규모댐 설치 필요성이 커지고 있다. 따라서 본 연구에서는 소양강, 충주, 횡성, 안동, 임하, 합천, 남강, 밀양, 대청, 용담, 섬진강, 주암(본,조), 부안, 보령, 장흥 등 전국의 다목적댐 15개소의 상류 하천 및 유역을 대상으로 국내외 사례를 조사하여 소규모댐의 정의, 역할, 기능 및 효과를 제시하고 소규모댐의 필요성 및 사업의 타당성을 정립하며, 상류 소규모댐 개발 가능지점 선정을 위하여 댐별 특성을 고려한 수문현황, 환경기초현황 등의 문헌조사와 이를 토대로 도상검토 및 현장조사를 통한 홍수조절, 상류 용수공급, 퇴사, 탁수, 부유물, 레크레이션 등의 소규모댐의 필요성을 제시하여 지자체 및 지역의견 수렴후 개발지점을 선정하는 것이다. 개발지점 선정을 위하여 이수부문 및 치수부문으로 조사목적을 구분하였으며, 이수부분은 인구 현황 및 상수도 이용실태 등을 각 댐별 관련보고서 및 현황 자료를 조사 분석하여 개발의 필요성 및 지점을 결정하였고, 치수부분은 홍수피해액, 수해상습지 및 재해위험지구 등을, 소규모댐의 설치 목적별로 지표들을 핵함수를 이용한 비매개변수적 확률밀도함수법으로 지수화하여 우선순위를 결정하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.1
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• pp.70-76
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• 2010

In this paper, we propose a personalized Chinese character education system using RankBoost algorithm on a smartphone. In a typical Chinese character education scenario, a trainee is supplied with a finite number of Chinese characters as an input set in the beginning. And, as the training session repeats, the trainee will notice her/his difficult characters in the set which she/he hardly answers. Those characters reflect their personalized degrees of difficulty. Our proposed system constructs these personalized degrees of difficulty using RankBoost algorithm. In the beginning, the algorithm start with the set of Chinese characters, of which each is associated with the same weight values. As the training sessions are repeated, the algorithm increase the weights of Chinese characters that the trainee mistakes, thereby eventually constructs the personalized difficulty degrees of Chinese characters. The proposed algorithm maximizes the educational effects by having the trainee exposed to difficult characters more than easy ones.

• The Journal of the Korea Contents Association
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• v.13 no.2
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• pp.127-136
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• 2013

The purpose of this study is to derive key success factors' priorities to industrialize can art using AHP methodology and to suggest blue ocean strategy of can art. First, the survey result showed that the most important factor was eco-commercialization(0.227). And cultural value(0.223), distribution(0.217), experience learning(0.202) are presented in order in terms of the importance. Second, it also suggested eco-design(0.118), recycling improvement(0.118), education value increase(0.117), viral marketing(0.113), and various experience learning(0.105) as detailed important factors. Moreover, this study implies that can art needs to focus on intensifying environmental craft education and eco-commercialization as blue ocean strategies.

• Journal of Information Management
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• v.38 no.1
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• pp.121-139
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• 2007

The advance of science and technology becomes the nerves of the development of economy and industry of our future in the regional level as well as in the national and international level. In Korea, it has been more than 10 years since local governments launched, and they are strategically fostering their specialized regional industries. Both the central government and the regional governments prepare and execute policies to foster specialized regional industries. Though there are many kinds of methods to analyze the outcomes of science and technology of region, in this paper, we measure the outcomes of science and technology of region by applying an informetric analysis on the SCIE papers and USPA patents. To seek for the regional speciality, we analyze the total national outcomes and the regional outcomes of S&T activities in Korea.

• Korean Journal of Construction Engineering and Management
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• v.10 no.3
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• pp.83-91
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• 2009

Construction industry is a complex industry which should be invested with plenty capital, manpower and resources. Investment factors and inner and outer environmental factors should be managed systemically in terms with risk factors possible to occur. It maximizes the profit to establish construction management by managing risk systemically. While previous studies were executed with risk related to some special progress lively, studies about risk in managing construction company leave much to be desired. Therefore, this study examined risk in the whole construction management, showed the checklist and deduced the quantitative factors through questionnaire analysis from specialists. Also, priority and grade of construction management factors were evaluated by analyzing weight of construction risk factors.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.2A
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• pp.55-62
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• 2003

This paper proposes an efficient and differentiated MAC scheduling algorithm for Bluetooth systems. The proposed algorithm guarantees QoS (Quality of Service) requirement of each master-slave pair or application. Conventional MAC scheduling algorithms for Bluetooth take priority of each pair into consideration and demonstrate relatively reasonable performance. However, their performances may depend on traffic characteristic, or they are limited by overheads for signaling. In this paper, we propose a new MAC scheduling algorithm superior to the conventional algorithms from the viewpoints of throughput, delay, and supporting QoS. Our proposed algorithm is evaluated via computer simulations under various environments and compared with the conventional scheduling algorithms. Simulation results indicate that the proposed algorithm shows better performance than the existing algorithms, and can support the QoS demand of each pair.

• Journal of Korea Water Resources Association
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• v.39 no.11 s.172
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• pp.947-960
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• 2006

This study shows the application of sustainable water resource planning procedure developed in the previous paper. Its goal is to prevent the streamflow depletion in upstream watershed of the Anyangcheon which is a typical urban stream. The pressure-state-response model which is the framework to reflect the sustainability was applied. The composite programming which is the multilevel multicriteria decision making technique is also used in the calculation of state and evaluation index. The feasible alternatives were proposed and hydrologically analyzed by SWAT(Soil and Water Assessment Tool) and the priority ranking of alternatives were proposed based on the results of SWAT.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.11
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• pp.1177-1184
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• 2014

An wired ship area network has functionality of remote control and autonomous management of various sensors and instruments embedded or boarded in a ship. For such environment, the DiffServ (Differentiated Services) realizes that the high-speed real-time flow with the higher priority has the guaranteed minimum data rate and is delivered faster. As a result of this DiffServ effect, the intelligent Ship Area Networks can be implemented. In this paper, an packet drop technique is proposed to outperform the previous RIO (RED In and Out) drop mechanism for DiffServ in ship area networks. the proposed packet drop technique does not manage the individual flows and divides them into several flow groups according to a criterion. And it guarantees the fairness between individual flows in the same QoS class through the group-based control. In simulation results of the proposed packet drop technique, the link utilization decreases than RIO. But it guarantees more data rates to DiffServ flows passing multiple bottleneck links.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.459-459
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• 2021

오래 전부터 농업용수 취수 등의 목적을 위해 설치된 하천 내 횡단구조물이 약 34,000개에 달하고, 홍수피해 방지를 위해 하천변을 따라 많은 제방이 설치되어 있다. 특히 보, 낙차공, 교각 보호공 등의 횡단구조물은 흐름의 단차를 발생시킴으로써 어류의 이동 등 하천의 종적 연속성을 훼손 또는 단절하고 있어 하천 수생태계 연속성 확보 측면에서 매우 중요한 요인으로 볼 수 있다. 하천 종적 연속성과 관련된 연구는 북미, 호주, 유럽, 일본 등에서 수생 종 특히, 어류를 중심으로 장벽의 영향을 분석하는 데 중점을 두고 진행되어 왔다. 하천 네트워크 규모에서 다수의 장벽 설치에 대한 누적 효과를 분석한 사례는 거의 없으며, 서식지 및 수생태계 연결과 관련하여, 하천 시스템의 네트워크 규모에서 속성을 설명하고 정량화하는 도구 역시 찾아보기 어렵다. 본 연구에서는 하천 네트워크 내의 종적 방향의 연결성을 정량화하기 위한 방법으로 Cote 등(2009)이 제시한 DCI(Dendritic Connectivity Index) 지표를 이용하였다. 수계 연속성 지표(DCI)는 하천 수계 내의 종적 연속성 평가를 목적으로 횡단구조물의 개소수와 위치, 어류의 이동률을 누적하여 정량화한 방법으로써, 구조물 단위 평가가 아닌 하천 단위 평가 방법이다. 곡성천과 삼척오십천을 대상으로 국가어도정보시스템 및 항공사진을 통해 구축한 구조물의 개소수와 위치정보를 이용하여 시계열 DCI를 산정하였다. 그리고 2차 조사에 걸쳐 횡단구조물 현황 및 수리 특성, 어류현황 및 이동특성 조사 및 분석결과를 DCI에 반영하여 DCIm을 산정하였다. 곡성천의 경우 현재(2018년) DCI 결과는 5.63%이며, 어류 이동률 적용 결과 DCIm은 6.29%로 산정되었고, 약 11.7% 증가하는 것으로 나타났다. 삼척오십천의 현재(2018년) DCI 결과는 9.78%이며, 어류 이동률 적용결과 DCIm은 10.34%로 산정되었고, 약 5.7% 증가하는 것으로 나타났다. 향후 하천 내 수생태계의 연속성을 확보하기 위해서는 우선적으로 하천 수생태계 훼손, 단절, 연속을 효과적으로 비교·평가할 수 있으며, 이를 통해 개선사업의 우순순위 등 의사결정을 위한 방법론의 개발이 필요하다.

• Korean Journal of Remote Sensing
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• v.38 no.3
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• pp.251-263
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• 2022

This paper presents an idea of ScanSAR image formation. For image formation of ScanSAR that utilizes the burst mode for raw signal acquisition, most conventional single burst methods essentially require a step of azimuth stitching which contributes to radiometric and phase distortions to some extent. Time-domain cross correlation could replace SPECAN which is most popularly used for ScanSAR processing. The core idea of the proposed method is that it is possible to relieve the necessity of azimuth stitching by an extension of Doppler bandwidth of the reference function to the burst cycle period. Performance of the proposed method was evaluated by applying it to the raw signals acquired by a spaceborne SAR system, and results satisfied all image quality requirements including 3 dB width, peak-to-sidelobe ratio (PSLR), compression ratio,speckle noise, etc. Image quality of ScanSAR is inferior to that of Stripmap in all aspects. However, it is also possible to improve the quality of ScanSAR image competitive to that of Stripmap if focused on a certain parameter while reduced qualities of other parameters. Thus, it is necessary for a ScanSAR processor to offer a great degree of flexibility complying with different requirements for different applications and techniques.