• Spatial Information Research
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• v.5 no.2
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• pp.185-194
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• 1997

Spatial decision support systems(SDffi), a new class of decision support system(DSS), result from the melding together of GIS and DSS, Planning support systems(PS5) add more advanced spatial analysis functions than GIS and intertemporal functions to the functions of SDSS. This paper reports the development of a planning support system providing a framework that facilitates urban planners and civil engineers in conducting coherent deliberations about the generation of satisficing sewers. 1he planning support system for the generation of satisficing sewers(PS5/GSS) was designed from the understanding that land use and development drive the demand for storm and sanitary sewers. Through four stages of supply, demand, alternative generation, and evaluation, PSS/GSS integrates basic planning, preliminary design, and engineering design of sewer. GIS and graphic user interface are excellent toolboxes for designing sewer networks, estimating the quantity of wastewater, and showing generated alternative sewers. A sewer model using simulation tedmique can generate an initial sewer. Users can define alternative sewers by the direct manipulation of sewer networks or by the manipulation of parameters in the sewer model. The sewer model evaluates the performance of the user defined alternatives.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.3
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• pp.89-109
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• 2018

This study investigates the influence of project-based learning method on the self-directed learning and problem-solving abilities of students taking the 'Media Center Management' course in Library Information Science (LIS). During this study, two tests measuring students' self-directed learning and problem-solving abilities were conducted, containing 48 items divided into 8 categories and 30 items divided into 5 steps of problem-solving processes, respectively. By utilizing the correspondence sample T-test during this study, statistically significant results were found in all categories of self-directed learning, excluding the 'self-understanding' category. In addition, significant differences were found in the 5 steps problem-solving processes as well. Subsequently, an in-depth interview was conducted, inquiring into the students' perspectives on the difficulty of attending classes, the content of lectures, the appropriateness of assignments, the validity of the evaluation method, the relationship with their team members, and the benefits acquired from completing the assignments. Finally, suggestions for future research were presented.

• Journal of the Korean Society for information Management
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• v.41 no.2
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• pp.71-96
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• 2024

This study focused on the fact that limitations of implementing school-centric models and standards of information literacy construction. This study was conducted with the purpose of developing and validating an instructional model to effectively design and practice online information literacy instruction for upper elementary school students based on a public library. Through a review of prior literature and analysis of current status and cases, a primary model was developed including the definition and area of information literacy, learning stages and activities, conceptual and procedural model, and teaching and learning plan. In addition, the first and second expert surveys were conducted to evaluate the internal validity of the model. The final model was derived by synthesizing and converging the collected opinions. As a result of the study, the final model consisted of 7 areas: 'Information literacy concept', 'Instruction component area', 'Conceptual model', 'Procedure model', 'Design principles and detailed guidelines', and 'Learning Steps and Activities' and 'Teaching and Learning Plan'.

• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.4
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• pp.105-117
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• 2010

The topographical depressions in urban areas, the lack in drainage capability, sewage backward flow, road drainage, etc. cause internal inundation, and the increase in rainfall resulting from recent climate change, the rapid urbanization accompanied by economic development and population growth, and the increase in an impervious area in urban areas deteriorate the risk of internal inundation in the urban areas. In this study, the vulnerability of internal inundation in urban areas is analyzed and SWMM model is applied into Oncheoncheon watershed, which represents urban river of Busan, as a target basin. Based on the results, the representative storm sewers in individual sub-catchments is selected and the risk of vulnerability to internal inundation due to rainfall in urban streams is analyzed. In order to analyze the risk and vulnerability of internal inundation, capacity is applied as an index indicating the volume of a storm sewer in the SWMM model, and the risk of internal inundation is into 4 steps. For the analysis on the risk of internal inundation, simulation results by using a SMMM model are compared with the actual inundation areas resulting from localized heavy rain on July 7, 2009 at Busan and comparison results are analyzed to prove the validity of the designed model. Accordingly, probabilistic rainfall at Busan was input to the model for each frequency (10, 20, 50, 100 years) and duration (6, 12, 18, 24hr) at Busan. In this study, it suggests that the findings can be used to preliminarily alarm the possibility of internal inundation and selecting the vulnerable zones in urban areas.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.10a
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• pp.298-301
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• 2000

1980년대 이후 이동통신은 급격한 발전을 거듭하여 왔다. 이제 음성과 문자 서비스뿐만 아니라 영상 서비스까지도 가능한 IMT-2000 시대를 맞이할 것으로 전망된다. IMT-2000은 기존의 모든 통신서비스를 수용하면서 멀티미디어 서비스로 영역이 점점 더 확장되어 가는 제 3 세대 종합이동통신 시스템을 의미한다. IMT-2000은 기존의 이동통신에서 제공할 수 없었던 서비스가 추가되어가는 단계적인 서비스의 고도화가 예상된다. 이와 같이 IMT-2000 서비스의 요구사항이 단계적으로 발전되어감에 따라 사용자 관점에서 고품질의 서비스를 제공하고 나아가 세계시장에서의 경쟁우위를 달성할 수 있는 고객만족을 전략적으로 추구해야 할 필요성이 대두되고 있다. 이를 위해서 서비스의 단계적인 고도화에 따라 각 서비스의 고객만족 평가체계를 구축하고 전체적으로는 우수한 고객가치를 전달 할 수 있는 지속적인 평가와 개선이 요구된다. 본 연구에서는 IMT-2000 서비스의 고객만족 평가속성 체계를 1차적으로 정리하였다. IMT-2000 서비스 시장이 앞으로 어떻게 전개될 지 모르는 불확실한 상황이지만 기존의 고객만족 패러다임과 실무 및 학계에서의 이동통신 관련 고객만족 문헌, IMT-2000 서비스관련 문헌 등을 토대로 고객만족 평가속성들을 체계적으로 도출하고자 하였다. 이후 이론적 타당성과 실증분석을 통해 더욱 체계적인 고객만족속성체계를 제안하고자 한다

• The KIPS Transactions:PartC
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• v.14C no.2
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• pp.179-184
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• 2007

The problem of selecting base station location in the design of mobile communication system has been basically regarded as a problem of assigning maximum users in the cell to the minimum base stations while maintaining minimum SIR. and it is NP hard. The objective function of warehouse location problem, which has been used by many researchers, is not proper function in the base station location problem in CDMA mobile communication, The optimal and approximate solutions have been presented by using proposed object function and algorithms of exact solution, and the simulation results have been assessed and analyzed. The optimal and approximate solutions are found by using mixed integer programming instead of meta-heuristic search methods.

• 한국방재학회:학술대회논문집
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• 2011.02a
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• pp.35-35
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• 2011

CFT가 갖는 다양한 구조적 이점으로 인해, 축력이 지배적인 기둥 구조물에만 주로 적용되던 CFT 요소가 점차 거더에 적용되어 가고 있다. 그러나, 현재 CFT 요소에 대한 설계 기준은 축력이 지배적인 보-기둥 구조물에 대한 것으로 제한되어 있으며, 휨이 지배적인 보 구조물에 대한 현행 설계 기준의 적용성을 검토해야 할 필요가 있다. 현행 설계기준에서 제시하고 있는 CFT 요소의 극한 강도 평가방법은 소성응력분배법 및 변형률적합법으로 구분되어지며, 각 방법을 이용한 극한 강도의 평가결과를 기존 연구자들의 CFT 요소 휨 실험결과와 비교 분석하였다. 휨 강성 평가에 대한 타당성을 검증하기 위해 AISC에서 제시하는 휨 강성 평가식을 기존 실험 연구와 비교 검토하였으며, 아울러 압축력에 따라 휨 강성을 보정할 수 있도록 수정된 Roeder et al.의 제안식을 함께 검토하였다. 검토 결과, 강도 평가에 있어서는 설계 기준에서 제안하는 두 방법 모두 CFT 거더의 휨 강도를 적절히 평가할 수 있었으며, 강성 평가에 있어서는 설계 기준의 제안식이 휨 초기 강성을 적절히 평가하는 반면 사용 단계에서의 휨 강성은 Roeder et al.의 수정된 강성 평가식에 의해 적절히 평가할 수 있음을 확인하였다.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.39 no.1
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• pp.33-41
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• 2002

In this paper, we present a frequency weighted model reduction using LMIs for minimizing the H$\infty$ weighted model error compared with the methods of frequency weighted balanced truncation and frequency weighted Hankel norm approximation. The proposed algorithm, its form is equal to the sufficient condition of performance preserving controller approximation, is based on an iterative two-step LMI scheme induced from bound real lemma. So, it can be applied to the problem of the performance preserving controller approximation. The controller reduction is useful in a practical control design and ensures its easy implementation and high reliability The validity of the proposed algorithm is shown through numerical examples. Additionaly, we extend the proposed algorithm to performance preserving controller approximation by applying to the HIMAT(highly maneuverable aircraft technology) system.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.8 no.6
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• pp.180-186
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• 2009

Due to the large capacity and low cost, electrolytic capacitors with of energy storage and voltage regulation are used for almost all types of non-linear load as the DC/DC converter. Electrolytic capacitor, which is the most of the time affected by the aging effect, plays very important role for the power converter system quality and reliability. Therefore, this paper proposes a new method to detect the changes the capacitance value of an electrolytic capacitor in order to analyze the internal characteristic and worn-out state of an electrolytic capacitor. Simulation results by frequency analysis show the validity of the proposed capacitance estimation algorithm.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2014.05a
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• pp.44-45
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• 2014

Recently the Korean government also has strictly restricted a law such as GBCC(Green Building Certification Criteria)and RPS(Renewable Portfolio Standard) on the construction. Especially the government announced a obligation of renewable energy consumption over 12% for all the public buildings of total area over 1,000㎡ since 2014. Regarding to the policy, this study presented the economics of energy analysis of the public office buildings that supplies 12% renewable energy output in the early stage of construction project. This paper calculated on CO₂ emission by the geothermal, solar heat, and solar photovoltaic system and estimated the saving cost. Reduced cost through the energy saving are predicted to influence on the total construction cost. As a result air pollution and energy saving cost are expected that renewable energy system would be saving total initial cost of construction on planning phase.