• Proceedings of the Materials Research Society of Korea Conference
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• 2011.10a
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• pp.5-5
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• 2011

Lithium ion batteries are found to have wide range of applications in variety of mobile devices ranging from simple toys to electric vehicles. The performance of these batteries depends on the choice of constituent materials. In this lecture, the materials aspects and perspectives of the electrode batteries will be discussed. Results from some of the specific studies made at speaker's laboratory will be presented.

• 한국전산유체공학회:학술대회논문집
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• 2007.04a
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• pp.120-124
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• 2007

Helicopters and rotary-wing vehicles encounter a wide variety of complex aerodynamic phenomena and these phenomena present substantial challenges for computational fluid dynamics(CFD) models. This investigation presents the rotor aerodynamic analysis items for the helicopter development and variety aerodynamic analysis methods to provide the better solution to researchers and helicopter developers between aerodynamic problems and numerical aerodynamic analysis methods. The numerical methods to make an analysis of helicopter rotor are as below - CFD Modelling : actuator disk model, BET model, fully rotor model,... - Grid : sliding mesh, chimera mesh / structure mesh, unstructure mesh,... - etc. : panel method periodic boundary, quasi-steady simulation, incompressible,... The choice of CFD methodology and the numerical resolution for the overall problem have been driven mostly by available computer speed and memory at any point in time. The combination of the knowledge of aerodynamic analysis items, available computing power and choice of CFD methods now allows the solution of a number of important rotorcraft aerodynamics design problems.

• Journal of the Korean Society of Clothing and Textiles
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• v.24 no.2
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• pp.266-276
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• 2000

This study was designed to examine the consumers' fashion store choice process based on the wedding dress stores, and also to find the consumers' shopping orientation and store attributes affects to store choice process. This study adapted a survey method. Each 48 wedding dress stores in Ahyun-dong and Kangnam were selected, and 325 women who got married within 2 years ago were recruited, convenient sampled as the subjects and the survey methodology was used for data collection. And convenience sampling method was used for data collection. The results of this study can be summarized as follows; First, wedding dress buyers wear classified into four subdivisions by shopping orientation; reputation-oriented group, utility-oriented group, fashion-oriented group, and time-oriented group. Second, there was significant differences in store choice type between shopping orientation group. Third, in case of important ranks on store attributes, evaluation of store attributes for each step-consideration step, visit step and choice step-was revealed to be coherent. Fourth, there was differences in important ranks among each groups. The most important attribute for all the groups was design, but reputation-oriented group raid importance to reputation of store, utility-oriented group and time-oriented group to economy, and fashion-oriented group to variety than other groups. Firth, there was no significant difference in attitude for wedding dress stores by shopping orientation groups and demographic characteristics.

• Journal of Korea Trade
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• v.26 no.7
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• pp.1-18
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• 2022

Purpose - Recent international studies have largely focused on measuring the welfare gains from increased trade varieties. To adequately capture the variety gains, it is of importance to estimate the elasticity of substitution between varieties of trade goods because it is one of the key parameters to determine the magnitude of the variety gains. Using the import data of South Korea, this paper shows that the elasticities vary substantially across the estimators, which affects the magnitude of the gains from trade. Design/methodology - Empirical studies working on the gains from trade variety have heavily depended on the estimation methods for the elasticity of substitution between trade varieties, developed by Feenstra (1994) and refined by Broda and Weinstein (2006). We estimate and compare the estimated elasticities for 8,945 HS 10 goods of South Korea, obtained from the three estimation methods: Feenstra's weighted least square (F-WLS), Feenstra's feasible generalized least square (F-FGLS), and Broda and Weinstein's feasible generalized least square (BW-FGLS). Findings - Using the estimated elasticities from the F-FGLS, considered as a suitable estimator, A typical Korean consumer saved 228 dollars per year by the greater access to new import varieties. This leads to gains from imported variety of 2.06% of GDP. In 2017, a typical Korean consumer would gain by 611 dollars, compared with 2000. China is the country with the largest contribution (28.4%), followed by Japan and USA. About 50% of all the welfare gains come from the imports from the three main trade partners. The Southern Asian countries are more important to the South Korean welfare gain than the Western European countries. Originality/value - Existing studies have chosen one of the methods without any criterion for the choice and then estimated the elasticities of substitution between varieties of trade goods. This paper focuses on the estimation specifications and methods as the cause of the disparity in estimated elasticities and welfare gains from trade variety. According to the Ramsey RESET and White tests, the F-FGLS estimates are relatively better compared to the F-WLS and BW-FGLS estimates. As another contribution, this paper provides the first measure of the welfare gains from trade variety for South Korea, using the estimated elasticities of substitution between trade varieties.

• The Journal of the Korea Contents Association
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• v.15 no.8
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• pp.375-388
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• 2015

This study verified empirically and analyzed systematically how the hospital choice factors of visitors in general hospitals influence customer satisfaction and revisiting intention. As a survey way for hypothesis verification of this study, we took a direct survey for 4 weeks(June 1 to June 28, 2014) to the outpatients and their guardians visiting the three general hospitals in Busan, Ulsan, Gyeong-nam. For the survey we distributed a total of 550 questionnaire and used the final 519 of them in verifying this research model except unreliable 31 data. The result showed that human element, accessibility element and public image of hospital choice factors effected on the customer satisfaction, but physical and effectiveness factors did not effect on it. And, the only public image factor of hospital choice factors have a good effect on the revisiting intention. Also, it influenced between customer satisfaction and revisiting intention, so it is proved that the customer satisfaction is a important factor to revisiting intention. The hospitals should promote a hospital policy to connect with customer satisfaction and income growth and provide a high-quality medical service by making effectively use of planning priority strategies of hospital management with a variety of factors.

• Journal of Digital Convergence
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• v.15 no.7
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• pp.231-238
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• 2017

The purposes of this study is to analysis the differences of the hospital choice factors between first-visit and revisit patients in general hospitals. The samples used for data analysis are 499 outpatients of G, H, S, U hospitals using a standardized questionnaires in 4 provinces. In case of first-visit patients, human, effectiveness and accessibility factors were found to have a significant positive(+) effect on hospital choice factors. In case of revisit patients, human, physical, accessibility, image of hospital and salary factors were found to have a significant positive(+) effect on hospital choice factors. Based on these results, this study suggests implications to improve customer satisfaction, profitability and provide a high-quality medical service by making effectively use of planning strategies of hospital management with a variety of factors.

• The Korean Journal of Food And Nutrition
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• v.23 no.1
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• pp.52-62
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• 2010

This study investigated college students' patterns of visiting coffee shops which are formed by students' preferences. This study surveyed 300 college students in Seongnam. The subjects were consisted of 45.2% males and 54.8% females and the average age was 20.8 years. 41.3% of subjects visited coffee shops once or twice a month and 42.4% of subjects visited coffee shops on a random basis. 26.7% of subjects stayed in coffee shops for 1~1.5 hours. The main purpose of going to coffee shops was to enjoy specialty coffee. The subjects' first favorites was coffee with various kinds of syrups and second one was Americano. When the female subjects in Seongnam chose the coffee shops, they focused more on variety factors than the male subjects. The group of subjects who had monthly expenses of less than 400,000 won focused on price factors more than the group of subjects who had monthly expenses more than 400,000 won. Moreover, environmental factors were heavily related to the usage rate and staying time of the coffee shops. Above all, price factors and promotion factors affected subjects' choice of the coffee shops in Seongnam.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.10B
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• pp.900-908
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• 2006

This paper studied on the future market competitive structure among mobile multimedia services that offer a variety of multimedia services and contents through wireless networks. In the past, forecasting methods based on market data would be used popularly in telecommunications industry. However, methods must focus on not market data but customer preferences. In this reason, paper use to forecast the market competitive structure and offer firm strategies and policies using a customer choice probability model.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.21 no.4
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• pp.112-118
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• 2013

Air travel demand has recently been growing and establishment and operation of low-cost carriers have been increased. Against this backdrop, low-cost carriers need to figure out diversified customer demand for low-cost carriers and ways to maximize marketing efficiency before applying it to the field so that they can attain superiority to large carriers in increased intensified competition. Low-cost carriers need to be differentiated from other carriers for the purpose of improving profits. Toward this end, this study conducted analysis on importance and satisfaction with carrier choice using IPA with regard to low-cost carrier customers. In conclusion, the paper accurately examined advantages and disadvantages of low-cost carriers compared to general carriers based on results of IPA analysis and suggested managerial strategies to enhance competitiveness based on division into four parts including maintenance and enforcement (1st quadrant, Delay compensation, Booking rapidity, Check rapidity, Crew service, refund service, baggage service, punctuality, transit services, airlines images), concentrated improvement (2nd quadrant, price, Convenience of seat), passive administration (3rd quadrant, Boarding service, cabin cleanliness, flight schedule, whether local crew on board, meal service, in-flight entertainment service), and enhanced satisfaction (4th quadrant, duty-free service, Variety of routes), so that practical suggestions could be presented to employees working in the field.

• Management Science and Financial Engineering
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• v.13 no.1
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• pp.73-91
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• 2007

We investigate factors that influence the choice of high-share brands(HSBs) vs. low-share brands(LSBs) among various product and consumer characteristics related to brand-share perceptions. Specifically, using 8 product categories varying in terms of purchase decision involvement, we show how the influencing factors vary across the categories. At the general level that cover all the 8 categories, our hierarchical Bayesian regressions analysis shows that factors that favor high-share brands are purchase decision involvement, search goods, experience goods, price-quality relationship, positive network externalities, and price-prestige beliefs. Conversely, consumers who value variety seeking and need for uniqueness favor low-share brands. The effects of these factors, however, vary across product categories. The identification of these characteristics can help brand managers establish a more effective brand-share strategy in such areas as setting an optimal market share goal, extending a brand, and developing ad copy. Furthermore, our consumer segmentation analysis demonstrates the general market has two distinct segments - (1) a segment composed of HSB buyers(86%) and (2) a segment composed of LSB buyers(14%). The two segments are also shown to have different significant factors that explain their brand choice. Our segmentation analysis can help marketers establish a marketing strategy that targets a specific segment of interest.