• 터널과지하공간
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• 제18권6호
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• pp.465-479
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• 2008

저심도 터널 굴착시 예상되는 암반 거동을 정량적으로 파악하기 위해 계층 분석적 의사결정 방법과 암반 공학 시스템 방법을 적용하여 암반 거동 지수를 산정하였다. 복잡하고 조직화되지 않은 암반 거동을 효과적으로 결정하기 위해 쌍대 비교 매트릭스를 이용하는 계층 분석적 의사결정 방법과 상호 영향 매트릭스를 이용하는 암반 공학 시스템 방법을 적용하였고, 전문가 의견의 불확실성을 극복하고자 퍼지 델파이 방법을 적용하였다. 저심도 암반 터널 굴착 시 예상되는 암반 거동 유형으로 소성 변형, 낙반과 낙석을 제시하였다. 각각의 암반 거동 유형을 결정하기 위해 일축압축강도, 암질 지수와 절리 조건을 포함하는 암반 내생적 매개변수, 응력, 지하수와 지진 조건을 포함하는 암반 외생적 매개변수와 굴착 매개변수를 고하였다. 이를 서울 지하철 O호선 O공구 설계에 적용하여 예상되는 암반 거동 유형을 정량적인 암반 거동 지수로 제시하였다.

• 상하수도학회지
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• 제38권2호
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• pp.69-81
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• 2024

In this study, an evaluation system that can be used to evaluate the feasibility of developing and supplying hydrothermal energy for the operation of large-scale complex facilities was developed. To this end, this study derived factors to be considered when selecting a location for the use of hydrothermal energy using raw water from multi-purpose dams and regional water supply systems through literature survey and expert interviews. The evaluation indicators derived from this study are divided into four sectors: hydrothermal energy utilization factors, location factors, planning factors, and disaster safety factors, and are composed of 10 mid-level indicators and 34 detailed planning indicators. The relative importance of all factors was derived using the Analytic Hierarchy Process (AHP) technique, and the developed evaluation indicators and relative importance were applied to four multi-purpose dam regions in the country. As a result, it was found that in the development and use of hydrothermal energy utilizing regional raw water supply line the urban planning conditions of the supply site can have a greater impact on the location selection results than the hydrothermal energy development itself. Due to the characteristics of the evaluation indicators developed in this study and their nature as comprehensive indicators, it is believed that the results should be applied to determine the overall adequacy of site selection in the early stages of hydrothermal energy development. In the future, it is believed that it will be necessary to analyze the problems in supplying and operating hydrothermal energy using raw water from multi-purpose dams and regional water resources. Based on the analysis the evaluation system developed in this study is expected to be improved and supplemented.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.412-417
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• 2007

The energy efficiency and environment-friendly aspect of the railway system would be superior to other on-land transportation systems. In a preliminary feasibility study stage, the energy efficiency and problems related with environment are usually not considered. Selection of optimal railway line is taken into consideration include of the purpose of railway, geographical features and facility of management. The railway Alignment which could be reasons of environmental problems are focused and studied in this paper. This study performed opinions of specialists, checking of industrial environment, analysis of bid guideline to select the optimal line and executed AHP method to make quality model and choose weight factors. The investment for railway systems could be encouraged by the considering of main environmental elements evaluated with the modified noise and vibration standard for environment-friendly railway construction.

• 신재생에너지
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• 제7권3호
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• pp.83-91
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• 2011

The purpose of this study is to select appropriate location factors for wind power plant, provide detailed classification criteria, and find out appropriate sites for installing wind power plant in Gangwondo. In this study, the following 11 factors were extracted for site selection of wind power plant : wind resource, topography (valley angle, distance to the ridge), forest density, land use, preservation area, national park, Baekdu-Daegan, noise, shade, Transmission Line, and approaching roads. Each factor had relatively different level of importance so that AHP (Analytic Hierarchy Process) technique was used to calculated the weighted value per factor. For overlay analysis, classification criteria were prepared for each factor and each factor was classified into 3 grades : very appropriate, intermediate, poor. According to overlay analysis, the areas which received the highest grade (grade 5) was only in 0.16% of the total area of Gangwondo and had a tendency to exist along the mountain ridge over 600-meter elevation. Through analyzing the yearly average of wind power density, it was proved that the wind power density of areas with grade 4 or 5 had abundant wind resource over $400W/m^2$.

• Geomechanics and Engineering
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• 제30권3호
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• pp.313-324
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• 2022

With the development of the economy, people's utilization of underground space are also improved, and a large number of cities have begun to build subways to relieve traffic pressure. The choice of subway station construction method is crucial. If an inappropriate construction method is selected, it will not only waste costs but also cause excessive deformation that may also threaten construction safety. In this paper, a subway station construction scheme selects model based on the AHP-fuzzy comprehensive evaluation. The rationality of the model is verified using numerical simulation and monitoring measurement data. Firstly, considering the economy and safety, a comprehensive evaluation system is established by selecting several indicators. Then, the analytic hierarchy process is used to determine the weight of the evaluation index, and the dimensionless membership in the fuzzy comprehensive evaluation method is used to evaluate the advantages and disadvantages of the construction method. Finally, the method is applied to Liaoyang east road station of Qingdao metro Line 2, and the results are verified by numerical simulation and monitoring measurement data. The results show that the model is scientific, practical and applicable.

• 한국산학기술학회논문지
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• 제8권3호
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• pp.673-681
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• 2007

최근 새롭게 6시그마를 도입한 기업과 이미 장기간 품질분임조 활동을 진행해 왔던 제조업체를 중심으로 기존의 분임조 활동을 어떻게 6시그마와 연계시킬 것인지에 대한 논의가 활발한 상황이다. 본 연구는 품질분임조 활동과 6시그마를 결합한 절차를 실제 생산 공정 문제에 적용하고 그 효과를 입증하는 것을 목적으로 한다. 즉, 품질개선 활동의 단계적 절차를 수행함에 있어, 문제정의(Define), 측정(Measure), 분석(Analyze) 등의 초기 단계에서는 6시그마의 절차를, 개선(Improve)과 관리(Control)에 해당하는 후반부에서는 PDCA사이클을 중심으로 한 품질분임조 기법을 활용하였다. 특히 개선대상 과제(테마)를 선정함에 있어 계층의사결정(AHP)을 활용함으로써 보다 합리적인 의사결정을 추구하였으며, 실험계획법을 통해 공정 개선을 위한 최적의 대안을 선정하기도 하였다. 제안된 절차의 적용결과 불량률이 현저히 감소하고 상당한 비용절감의 효과가 있음을 확인할 수 있었다.

• 대한전자공학회논문지
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• 제25권4호
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• pp.430-436
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• 1988

LSF(Line Spectral Frequency) derived from LPC has known as a very useful transmission parameter of speech signals, for it has a good linear interpolation characteristics and a low spectrum distortion at low bit rates coding. This paper presents that it is possible to extract directly the formant frequencies of speech signals from LSF parameter without application of FFT algorithm by comparing the distribution of LSF parameter with the frequency distribution of analysis filter. This paper suggests the advanced algorithm that results in improving the speed of convergence at analytic solution method. Also, for the flexibility of parameters, the process that transforms from LSF to LPC is presented.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제26권1호
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• pp.137-154
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• 2012

미적분학에서 '근사(approximation)'는 핵심 개념 가운데 하나인데, 이를 설명하기 위한 기본 개념은 '접선(tangent)'이며, 접선은 특별한 조건을 가지는 '직선(line)'이다. 본 연구에서는 미적분학의 이론적 기초가 되는 이들 수학적 지식에 대해 중등학교 기하지도 관점에 기초하여 교수학적 고찰을 하고, 이와 관련하여 개연성 있는 지도를 위한 주안점과 지도 방안을 제안한다. 이를 위해 유클리드 기하학에서의 점, 선, 원, 직선, 접선, 근사에 대해 알아보고, 이를 해석 기하학으로 번역하는 과정을 통해 대수적 조작을 위한 수학적 지식들을 유의미하게 유도한다. 그리고 현대수학의 관점으로 이를 발전시켜 근사를 위한 수학적 지식들의 유선(流線, stream line)을 구성한다. 또한 이를 바탕으로 직선, 접선 그리고 근사에 관한 학교수학의 내용을 고찰하여 지도의 주안점과 지도 방안을 모색한다. 이러한 연구는 교사들에게 교수학적 내용지식을 주며, 이들 수학적 지식을 개연성 있게 지도할 수 있는 수업모델 개발에 대한 기초를 제공한다. 나아가 학생들에게 수학이 계통적 학문이라는 것과 학교수학이 뚜렷한 목적성 아래 구성된 활동이라는 것을 인식하게 한다.

• 품질경영학회지
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• 제41권2호
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• pp.301-322
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• 2013

Purpose: This study aims to determine the needs of customers who use railroads as a mode of transportation and propose customer-oriented improvements in railroad technology by making connections between customer needs and railroad technology. Methods: We primarily used two methods for this study, AHP and QFD. First, AHP was used to evaluate the relative importance among the different components of railroad technology. Second, the QFD was applied to make a link between customer needs and railroad technology. Results: Railroad technology is largely divided into development, maintenance, and support. Empirical results showed the following improvement priorities in development, vehicle, system, line, signal/communication, power, and structure, in maintenance, vehicle, signal/communication, line, process, power, and structure, and in support, safety/precaution, management, environmental energy, operations/logistics, and station. Conclusion: Recognizing limitations in measuring the level of railroad technology when using the existing 'Technology Growth Model,' we used AHP and QFD to explore improvement directions for customer-oriented railroad technology. By offering customer-oriented services based on this study, railroad service providers will be able to acquire competitive advantage in the market.

• 산업경영시스템학회지
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• 제18권35호
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• pp.139-155
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• 1995

This study is concerned with the economic analysis of implementing a material handling system using automated guided vehicle(AGV)s in order to improve the productivity of the production process of chinawares. Analytic hierarchy process(AHP) method for selecting the facilities of material handling systems is presented. Subsequently, as an example, a chinaware production line is analyzed for the economic analysis. The result shows that seven manpowers can be reduced. However the introduction of the new material handling system is turn out to be undesirable due to high initial cost of AGV system, Nevertheless, in the long term, automatic material handling system such as AGV system are expected to play major roles in the modern manufacturing area.