• Environmental and Resource Economics Review
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• v.21 no.2
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• pp.237-269
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• 2012

This study applies a discrete-continuous choice model to a national survey data set of automobile uses to investigate the potential impacts of a bonus-malus system for new cars in Korea. Not only the impacts on the discrete choice of automobile type and class but also those on the continuous decision making of car operation are analyzed. The characteristics of automobiles and individuals that determine car choice and operation are identified. The simulation based on the estimation result shows that an appropriately designed bonus-malus system can induce a reduction in energy consumption and $CO_2$ emission substantially without additional government expenditure.

• Archives of design research
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• v.19 no.4 s.66
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• pp.101-110
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• 2006

In this study, I suggested a new model of universal web navigation design which can enhance users' web usability. I would like to prove that when users enjoy web navigation design, they access information much more effectively. Using a survey, I suggest some types of web navigation design for users. After that, I conducted an experiment with 4 types of web navigation designs, which have been developed to reflect varying stages of comprehensibility. My survey focused on three points. First I measured the time they spent to search for information. Second, I tested whether they lost their way while searching for information and if they did lose their way, I checked whether they could recover from their errors and find their way back. Third, I investigated whether layout, location and size of the web navigation design factors affected usability. The results of my survey indicated that users spend the shortest time, have the easiest interface, and have least error incidence under the web navigation design to enhance old-aged users' web usability. Thus, developing a universal web navigation design can encourage people to be more involved with the internet.

• Journal of Conservation Science
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• v.32 no.1
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• pp.63-73
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• 2016

This study defined material and characteristics of 24 glass fragments and 26 whole glass beads. The feature of glass beads shape are divided into 5 types following color, size, weathering condition and manufacturing techniques. Through the chemical composition, the first and second type is soda glass, the third type is potash glass, the fourth and fifth type is lead barium glass. This site showed the aspect that the chemical composition is changed according to the feature of glass shape and was found that various chemical compositions. Looking at the flow of glass culture, the tomb that are lead barium glass IItype and potash glass I, IItype is relatively preceding period and the tomb that are soda glass and lead barium glass IIItype is following period.

• Journal of the Korea institute for structural maintenance and inspection
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• v.20 no.5
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• pp.26-34
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• 2016

The failure modes of steel column-base plate connection arranged on the basis of AISC Design Guide-#1 and -#10 are base plate tension and compression side flexural yielding, yielding, pull-out and shear failure of anchor rod, concrete crushing in concrete footing and steel column yielding. The bending moment capacity and failure mode in this connection are predicted using limit-state function and we compare these results and test result. In the case that thickness of base plate is relatively thick, bending moment capacity and failure mode in steel column-base plate connection accurately predicted. But in the case that thickness of base plate is relatively thin and axial force do not exist, prediction of failure mode in this connection is somewhat inaccurate.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.4
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• pp.914-925
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• 1998

This paper considers the evaluation of the hybrid acquistion perdformance for the pilot signal in the direct sequence code division multiple access(DS/CDMA) forward link. the hybrid acquisition is introduced by the combination of two schemes, the parallel and serial acquisions. The mean acquisition time of the proposed scheme is derived to consider both the best case(the correct code-phase offsets are included i one subset) and the worst case(the correct code-phase offsets exist at the boundary of two subsets), which are cause by the distribution of the correct code-phase offsets in the subset. Expressions for the detection, false alarm, and miss probabilities are derived for the case of multiple correct code-phase offsets and multipath Rayleigh fading channel. Numerical results present the hybrid acquistion performance with repect to design parameters such as postdetectio integration length in the search and verification modes, subset size, and number of I/Q noncoherent correlators, and compare the hybrid acquistion with the parallel acquistion in terms of the minimum acquistion time under the same hardware complexity.

• Asia Marketing Journal
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• v.5 no.3
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• pp.35-59
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• 2003

본 연구는 동일 제품범주 내에서 상호 대체가능성(substitutability)을 중심으로 연구 되어 왔던 상표간의 사용상황 대체(substitution-in-use) 이론을 산업간 경쟁의 차원으로 확대하여 적용할 수 있는 가능성을 탐색하는데 그 목적이 있다. 이를 위해 소비자의 소비경험이 선택기준의 중요한 요소로 작용하는 서비스부문을 대상으로 소비자의 선택동기, 즉 소비동기의 차원에서 산업간 경쟁구조와 경쟁강도를 분석하고자 하였다. 연구의 범위는 마케팅 분야에서 비교적 소외되어 왔던 엔터테인먼트 부문, 특히 문화예술부문과 스포츠부문에 초점을 맞추었다. 연구방법으로는 이들간의 심리적 거리를 측정하여, 그 근접성의 정도에 따라 산업간 경쟁구조와 경쟁특성을 분석하였다. 분석도구는 그 동안 마케팅의 영역에서 특정 산업 내에의 상표간 경쟁구조를 연구하는데 이용되었던 심리적 거리측정도구를 이용하였다. 이에 따라 구매자의 사용목적에 따른 상표간 대체 가능성을 산업간의 심리적 근접성을 이용해 측정하고 그 거리의 크기에 따라 경쟁강도의 선택의 대체성을 분석하였다. 방법론적 측면에서는 먼저 엔터테인먼트산업, 문화예술과 공연예술산업, 그리고 스포츠 등의 소비동기 유형을 살펴본 후, 이들 중에서 중복가능성이 있는 동기유형을 선별하였다. 이에 따라 다양한 관람 엔터테인먼트산업에서 나타나고 있는 12개의 소비동기 유 형을 발견할 수 있었다. 이후 이렇게 추출된 동기유형을 대상으로 산업간 대체성을 심적 거리좌표를 이용하여 측정하고 측정된 자료를 다차원척도법(MDS)을 이용해 2차원의 공간 상에 투사하였다. 그리고 상호간의 근접성과 경쟁구조를 확인하고 분석결과에 대해 논의 하였다. 분석결과 엔터테인먼트 상품들간에는 근접성의 차원에서 서로 대체될 수 있음을 발견할 수 있었고 이는 이들이 동일한 시장을 대상으로 경쟁관계가 있음을 시사하는 것이다. 개별 관람동기 차원의 분석 결과, 관람 엔터테인먼트 소비자들은 동일한 관람동기를 서로 다른 많은 유형의 엔터테인먼트산업이나 공연예술, 문화예술상품, 쇼나 오락, 관람스포츠 등에 의해 해결하고 있음을 발견할 수 있었다. 본 연구에서 사용한 접근방법과 연구의 결과는 향후 간접적 관계에서 직접적 관계로 경쟁이 확대되는 많은 마케팅분야에 적용될 수 있을 것이다.

• Journal of Venture Innovation
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• v.2 no.2
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• pp.47-64
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• 2019

This study analyzed the effects of small business CEO's competencies type on business performance. For this purpose, 4 independent variables(strategic, marketing, management and network competencies) and 2 dependent variables(financial and non-financial performance) were used. 220 data were collected from the field survey questionnaires administered to a convenience sample of small business CEO. For hypothesis testing, the IBM SPSS Statistics 24.0 was used. Frequency analysis, exploratory factor analysis, correlation analysis, and hierarchical regression analysis were conducted. Empirical studies showed as follows. First, this study showed that the four competencies were significant to financial performance and the three competencies(except management competencies) were significant to non-financial performance. The higher small business CEO's competencies, the more likely it affects both the financial and non-financial performance of the company. Second, effects of small business CEO's competencies on financial performance were analyzed in order of network competencies > management competencies > strategic competencies > marketing competencies. Third, effects of small business CEO's competencies on non-financial performance were analyzed in order of network competencies > marketing competencies > strategic competencies. These findings had some implications. In academia, the impact forces of 4 small business CEO's competencies were analyzed for the first time. In practices, successful start-ups or sustainable management requires an interest in the active enhancement of small business CEO's competencies.

• Journal of the Korean Society for Railway
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• v.18 no.1
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• pp.8-14
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• 2015

This paper describes a prediction method for micro-pressure wave emitted from a tunnel on the Kyung-bu high-speed railway. Pressure and micro-pressure wave were measured simultaneously to obtain some constants for the prediction method. The change of a micro-pressure wave were analyzed according to the speed of the train, the track bed type, and the distance from a tunnel portal. At a train speed of 300km/h, the micro-pressure wave of 4.0km long ballast track tunnel is about 7.5Pa; that of 3.3km long slab track tunnel is about 14.3Pa The strength of the micro-pressure wave decreases in inverse proportion to the distance and becomes about 0.5~1.0Pa at a point of 100m from the tunnel exit. Micro-pressure waves were predicted using the formula with the obtained the constants. Using a comparison between the predicted data and field measurement data, it was confirmed that micro-pressure wave can be predicted easily through the prediction formula.

• Education of Primary School Mathematics
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• v.26 no.3
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• pp.181-197
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• 2023

The importance of reasoning processes based on fractional concepts and number senses, rather than a formalized procedural method using common denominators, has been noted in a number of studies in relation to compare the magnitudes of unlike fractions. In this study, a unlike fraction magnitudes comparison test was conducted on fourth-grade elementary school students who did not learn equivalent fractions and common denominators to analyze the reasoning perspectives of the correct and wrong answers for each of the eight problem types. As a result of the analysis, even students before learning equivalent fractions and reduction to common denominators were able to compare the unlike fractions through reasoning based on fractional sense. The perspective chosen by the most students for the comparison of the magnitudes of unlike fractions is the 'part-whole perspective', which shows that reasoning when comparing the magnitudes of fractions depends heavily on the concept of fractions itself. In addition, it was found that students who lack a conceptual understanding of fractions led to difficulties in having quantitative sense of fraction, making it difficult to compare and infer the magnitudes of unlike fractions. Based on the results of the study, some didactical implications were derived for reasoning guidance based on the concept of fractions and the sense of numbers without reduction to common denominators when comparing the magnitudes of unlike fraction.

• Journal of Industrial Convergence
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• v.17 no.4
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• pp.9-14
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• 2019

This paper presents several problems that can occur in the development of the ultra-compact LED package of less than 1.0mm and introduces the solution to them. In the existing mold structure, since the upper and lower core parts are integrated, various errors have occurred due to the roughness of EDM in the small model, which is a limiting factor in further reducing the mold size. As a countermeasure, the prefabricated model was presented in an earlier study to overcome the obstacles to the development of a ultra-compact LED package. In this paper, several problems have been found during the fabrication of prototypes as a starting work to produce the results for the presented model. The types are suggested and the solutions are discussed. And by changing the existing 2-row structure to 3-row structure in the same size lead frame, the aspect of efficient production is considered. The experimental procedure verifies the proposed solution and conducts a test to produce a prototype to confirm that a good product can be produced.