• 자원ㆍ환경경제연구
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• 제11권2호
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• pp.233-260
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• 2002

This paper tries to analyze the efficiency structure and regulatory effects in electric power industry by using total factor productivity and indices based on cost function method. This paper performed an empirical analysis on the efficiency improvement and optimal scale taking the cost aspect in electricity industry into account. By expanding the cost structure framework, this paper proposes the analytical method regarding the needs of technology regulation and presents the empirical results which can be verified. Hence, this work can play a key role in decision-making of the national power development and regulatory policy. The empirical result indicates that the electricity industry in Korea has been in the state of economies of scale until 1980s, However, due to sustained growth of power generation, economies of scale declined and subsided after 1980s and then diseconomies of scale is shown recent years. The analysis on the effect of technology regulation shows the national large-scale base-load power plant development-oriented policy until so far contributed substantial cost effect to the electricity industry. The empirical result indicates that the reserve requirement as one of means of technology regulation policy did not contribute to the economies of scale but positive effect on the total factor productivity in Korea.

• 사상체질의학회지
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• 제25권3호
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• pp.135-144
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• 2013

Objectives Two conflicting readings of "Donguisusebowon" so far have been presented that Sasang Constitutional Medicine inherited the traditional Five Elements theory and that it was a new perspective on its own right. The main purpose of this paper is to review the theoretical ground of Sasang Constitutional Medicine to see whether it has inherited the Traditional Korean Medicine, and show that it had been developed as an original view independent of the Five Elements theory. Methods To do this, I inquired into the theoretical background of Sasang Constitutional Medicine as well as its philosophical premises and its leading ideas. Results and Conclusions As a result, I have found that Sasang Constitutional Medicine is an original medical theory developed in empirical terms on its own right, divorced from the transcendental view of the Five Elements theory, while borrowing some concepts from I-Ching and Neo-Confucianism only for technical tools. In short, Sasang Constitutional Medicine may well be put as calling for a reappraisal of the Han-medical and Confucian accounts of human being, and a transition from speculative method based on the Five Elements theory to a verifiable empirical method. In this vein, my reading of Sasang Constitutional Medicine in empirical perspective may well be appraised as presenting a new way to further inquiries into the theoretical nature of it, and to getting itself across with Western medicine as well.

• Computers and Concrete
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• 제27권5호
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• pp.473-487
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• 2021

The review of the literature and design guidelines indicates a lack of design codes governing the shear strength of reinforced concrete (RC) beams strengthened with ultrahigh-performance fiber-reinforced concrete (UHPFRC). This study uses the results of a 3D finite element model constructed previously by the authors and verified against an experimental programme to gain a clear understanding of the shear strength of RC beams strengthened with UHPFRC by using different schemes. Experimental results found in the literature along with the numerical results for shear capacities of normal-strength RC and UHPFRC beams without stirrups are compared with available code design guidelines and empirical models found in the literature. The results show variance between the empirical models and the experimental results. Accordingly, proposed equations derived based on empirical models found in the literature were set to estimate the shear capacity of normal-strength RC beams without stirrups. In addition, the term 'shear span-to-depth ratio' is not considered in the equations for design guidelines found in the literature regarding the shear capacity of UHPFRC beams without stirrups. Consequently, a formula estimating the shear strength of UHPFRC and RC beams strengthened with UHPFRC plates and considering the effect of shear span-to-depth ratio is proposed and validated against an experimental programme previously conducted by the authors.

• Computers and Concrete
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• 제31권6호
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• pp.545-559
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• 2023

In this study, an experimental investigation was conducted to assess the influence of ground granulated blast furnace slag (GGBS) and silica fume (SF) on the fresh and hardened properties of grout specimens and preplaced aggregate concrete (PAC). Grout proportions were optimized statistically using a factorial design and were applied to 10 mm and 20 mm coarse aggregates to produce PAC. The results demonstrate that GGBS has a more significant effect on the compressive strength of grout compared to SF, with a small increase or decrease in the GGBS content having a greater influence on the compressive strength of grout than SF. The water to binder ratio had the most significant effect on the compressive strength of PAC, followed by the coarse aggregate size and sand to binder ratio. An empirical relationship to predict the compressive strength of PAC was proposed through an experimentally derived factorial design along with a statistical analysis of collectively obtained data and a deep literature review. The results predicted by the empirical relationship were in good agreement with those of PAC produced for verification.

• ETRI Journal
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• 제7권3호
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• pp.35-41
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• 1985

The objective of this study is to estimate the price elasticity of demand for telephone use in Korea. This paper provides a comprehensive review of the existing empirical study and establishes the econometric demand estimation model applicable to Korean telephone service. By this model, the price elasticities of demand in local and toll uses are estimated and their implications are discussed.

• 한국콘텐츠학회지
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• 제10권3호
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• pp.36-44
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• 2012

• 천문학회지
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• 제29권spc1호
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• pp.239-240
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• 1996

Precise masses, radii, and luminosities from eclipsing binaries and colour-magnitude diagrams for open clusters are classic tools in empirical tests of stellar evolution models. We review the accuracy and completeness required for such data to discriminate between current models and describe some recent. results with implications for convection theory.

• 복식문화연구
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• 제19권3호
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• pp.518-530
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• 2011

Based on the development of digital technology, Photoshop as a computer graphics program has extended its range of application to creative techniques that can express the contemporary sense of fashion illustration. Thus, the objectives of this study are to seek a new technique of fashion illustration through a study of computer graphics programs required for vitalization in this digital era and to present the application. This is done after a literature review and empirical investigation. For the literature review, specialty publications with precedent studies related to the subject of this study are examined, and internet materials with related key words are sought to establish the reference data for the study. For the empirical investigation, cases of each expression for blending mode are examined to seek the correct means of fashion illustration. Five works are created as a result. The specific contents of this study are as follows: First, the types and characteristics of blending mode are examined. Second, cases in which the blending mode is applied are analyzed to seek insight into their utilization. Third, five works are created by applying the blending mode to present the result.

• 통상정보연구
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• 제12권3호
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• pp.3-34
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• 2010

The purpose of this study is first to identify the dimensions of a trade show's service quality and the dimensions of the exhibitors' show performance, and thereafter determine the relationship between the trade show's service quality and the exhibitors' show performance. This study attempted empirical research, together with a literature review, to discover the effect of service quality upon on exhibitors' performance. A survey was conducted during an international trade show that was held in Korea where more than 100 businesses participated. The sample was selected from among the people who were in charge (e.g., managers) of their own private businesses. As a result, the study validated nine dimensions of a trade show's service quality: host and public relations, security, reputation and reliability, access, customer service, exhibition program, physical facilities, convenient facilities, and attendance cost. The study also identified five dimensions of the performance of participants: sales performance, information collection, networking, image building, and motivation. Overall, the empirical results of this study verified that there is a correlation between the performance of exhibitors and the service quality. of trade shows.

• 복식문화연구
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• 제23권6호
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• pp.1051-1060
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• 2015

The purpose of this study is to examine the different communication messages behind African women's hairstyles, and to compare young and old African women's hairstyles. The contents of this research are: the hairstyle as communication media, the types of African women's hairstyles, and the difference between young and old women's hairstyles. We used a review of literature and an empirical study as the research methods for this study. For the literature review, we used papers on African hairstyles, and we linked hairstyles to corresponding communication. For the empirical study, we took a database of 240 pictures (120 pictures of young women and 120 pictures of old women) from websites related to African hairstyles and we analyzed the pictures to differentiate between young and old African women's hairstyles. The results of this study reveal that African women's hairstyles express messages of power, ceremony, and status and identification communication. Within the 240 pictures, we found out which hairstyles are preferred by young and old women. Young African women prefer long, straight hairstyles and artificial hair (wigs), while old women keep short, natural hairstyles. The result of this research will be useful for understanding African women's hairstyles as well as contribute to the field of hair design.