• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권1호
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• pp.5-24
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• 2010

Data fusion is an attractive technology because it allows various trade-offs related to performance metrics, e.g., energy, latency, accuracy, fault-tolerance and security in wireless sensor networks (WSNs). Under a complicated environment, each sensor node must be equipped with more than one type of sensor module to monitor multi-targets, so that the complexity for the fusion process is increased due to the existence of various physical attributes. In this paper, we first investigate the process and performance of multi-attribute fusion in data gathering of WSNs, and then propose a self-adaptive threshold method to balance the different change rates of each attributive data. Furthermore, we present a method to measure the energy-conservation efficiency of multi-attribute fusion. Based on our proposed methods, we design a novel energy equilibrium routing method for WSNs, viz., multi-attribute fusion tree (MAFT). Simulation results demonstrate that MAFT achieves very good performance in terms of the network lifetime.

• 한국정보과학회논문지:데이타베이스
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• 제33권1호
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• pp.32-41
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• 2006

센서 네트워크는 온도, 습도 등 서로 연관된 여러 종류의 스칼라 데이타를 감지하기 때문에, 다차원 영역 질의가 유용하게 사용된다. 그리고 데이타 기반 센서 네트워크에서는 데이타가 센서에 직접 저장되기 때문에, 다차원 데이타를 효율적으로 관리하기 위해서는 데이타 주소 지정이 매우 중요하다. 이전의 다차원 영역 질의 처리 기법들은 데이타를 효율적으로 관리하는데 집중하여, 네트워크의 동작 시간(수명)을 고려하지 않았다. 본 논문은 Hilbert 곡선을 이용하여 센서 노드들을 선형화하고, 각 센서에게 데이타 공간을 균일하게 배분시키는, 동적인 데이타 분산 기법을 사용함으로써 네트워크 동작 시간을 연장시키는 방법을 제안한다.

• 산업경영시스템학회지
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• 제20권42호
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• pp.59-66
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• 1997

In the process to design a product, the values of the product will be designed must be considered in respect to the multi-dimensional properties consisted of subjective and objective attributes. As same reason, methods to evaluate the design alternatives in the process must evaluate the overall attributes and relationships among its, also. In this paper, the defectivenesses of evaluation methods in the process of product design are summarized. One of the severe defectivenesses of the methods is the insufficient rationality of calculation procedure. Then, we introduce the developed quantitative evaluation method to accomodate this defectiveness and to be considered a evaluator's feeling or ambiguity when evaluating design alternatives by means of fuzzy theory, and suggest it's application steps on the process of product design to be used easily.

• 기술혁신연구
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• 제13권1호
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• pp.73-89
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• 2005

As a scientific educational facility, the role of science museum has been enlarged. However there are few study to evaluate the public value of science museum. This paper applies a conjoint analysis to measuring the public value of science museum. At first, this paper chose the attributes of science museum and derived the marginal willingness to pay, As a result, the choice works for selecting a preferred option among three alternatives were within respondents' ability and the derived marginal willingness-to-pay estimates were statistically different from zero. This paper contributes to complementing the existing valuation methods by estimating the attributes of science museum and providing policy-makers with useful methodological framework and quantitative information in the decision-making process related to the policy of cultural facilities.

• 경영과학
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• 제20권1호
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• pp.125-139
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• 2003

City gas is becoming an essential resource in households due to its convenience and low price in comparison to other energy sources. However, in order to prepare for the gas market to be saturated, many city gas companies must pursue customer satisfaction management and develop happy call systems for a promising solution. In the development of the happy call systems, the difficult problem is that we cannot contact all customers because of limited resources and calling efficiency in the call center, We should find best customers according to their value. This paper suggests a methodology for the selection of happy call customers when city 9as companies consider two strategies. First, they should launch a new business area. Second, they must attempt to prevent current customers from moving from city gas to other fuels. We will discover important attributes and derive rules of weighting for the attributes through an exploration study that affect customer satisfaction and preference. Through a simulation model, we will show how many customers will be selected by our methodology.

• 소음진동
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• 제8권4호
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• pp.706-714
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• 1998

The purpose of this study is to analyse the main factors and attributes of psychological evaluation to noise. For this purpose, a psycho-acustic experiment was conducted by using the method of rating scale. 52 subjects were participated in the experiment, 20 stimuli were presented to subjects in random order with 23 adjectives. As a result of factor analysis, it was found that the primary factors for evaluating the quality of noise subjectively are four factors of unpleasantness, intensity, irregularity, and sharpness. And, as a result of MDPREF(multi-dimensional analysis of preference data), it was found that the noise sources including the factors of unpleasantness, intensity, and irregularity are related to the sounds of hammering in construction field, car horn, road traffic, idling of car, and printing by computer printer, and the factor of sharpness are the sounds of car siren, claps of thunder, car horn, and snowstorm etc.

• 한국유기농업학회지
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• 제28권2호
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• pp.189-208
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• 2020

The purpose of this study aims to estimate consumption selection attribute, part-worth of organic instant rice through the use of conjoint analysis method. The conjoint analysis is to trace the development of consumer preference among multi-attribute alternatives. The selection attribute was including 4 factors preferred Type of rice, Capacity, Brand and payment price. For this research, a total of 192 questionnaires was collected of which 200 were completed. The research design was a full profile method by orthogonal design then 9 main profiles, 3 holdout sets were created. The results of this research were as follows. Consumers of organic instant rice are consider their importance of selection attributes was in order to price (25.87%), Type of rice (27.231%), Brand/Purchase channel (24.013%) and Capacity (18.494%). The findings of this study have identified 3 clusters for each experience visitors. Each cluster has a different and showed the relative importance or preference values for each accessible attribute of the segmentation.

• 품질경영학회지
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• 제33권1호
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• pp.64-72
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• 2005

The ever increasing demand for enhanced competitiveness of engineered products requires "designing-in-quality" strategies that can effectively and efficiently incorporate concepts of uncertainty and quality into design. Multi-attribute utility function is commonly used to represent the decision-maker's preference on multiple design attributes under conditions of uncertainty and risk. One of the major issues in implementing this approach concerns the generation of appropriate utility function, especially in a complex engineering design environment. Typically, the decision maker's preference is revealed through lottery questions rather than being structured on the deductive reasoning to reflect the nonlinear tradeoffs among the attributes. The use of such intuitive procedures can lead to inexact preference information that may result in inaccuracy and rank reversal problems. This paper presents an alternative procedure based on the pair-wise comparisons between design alternatives towards a consistent preference presentation in assessing multiplicative utility function. The effectiveness of the overall procedures is tested with the aid of an injection-molding process design for a capacitor can and the results are discussed.

• 산업공학
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• 제12권2호
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• pp.266-273
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• 1999

This study is concerned with the selection of the main stadium for the World Cup football game to be held in Korea in 2002. Alternatives are (1) new construction of the main stadium at Sangam; (2) and remodeling Jamsil stadium constructed for Olympic in 1988; remodeling Munhak stadium in Inchon. For comparison purpose, we consider four decision attributes (environmental, economy. political and technical factors) under which several detailed sub-attributes are defined. Various multi-criteria decision-making tools such as AHP and TOPSIS are applied to find the best location. Our study results indicate that the best selection is remodeling Jamsil stadium. This appears due to heavy emphasis on economy factor in our analysis.

• International Journal of Contents
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• 제16권4호
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• pp.26-38
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• 2020

Determining the optimal levels of the technical attributes (TAs) of a product to achieve a high level of customer satisfaction is the main activity in the planning process for quality function deployment (QFD). In real applications, the number of customer requirements for developing a single product is quite large, and the number of converted TAs is also high so the size of the house of quality (HoQ) becomes huge. Furthermore, the TA levels are often discrete instead of continuous and the product market can be divided into several market segments corresponding to the number of HoQ, which also unacceptably increases the size of the QFD optimization problem and the time spent on making decisions. This paper proposed a genetic algorithm (GA) solution approach to finding the optimum set of TAs in QFD in the above situation. A numerical example is provided for illustrating the proposed approach. To assess the computational performance of the GA, tests were performed on problems of various sizes using a fractional factorial design.