• Journal of the Institute of Electronics and Information Engineers
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• v.49 no.12
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• pp.89-94
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• 2012

In this paper, a UHF cavity-backed spiral antenna for partial discharge diagnosis is proposed. The proposed antenna consists of two-arm Archimedean spiral, a cavity, and a balun for feeding. The spiral antenna is designed for 0.3-1.5 GHz operating frequency. Two spiral arms of the proposed antenna are fed by a microstrip tapered-balun. In order to enhance the gain, the cavity is located in the back side of the spiral pattern. The proposed antenna is designed and simulated using CST Microwave Studio. The designed antenna is also fabricated and tested to validate performance. The measured radiation patterns are directional to the +z-axis and measured peak gain is 9.92 dBi.

• Culinary science and hospitality research
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• v.10 no.2
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• pp.107-120
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• 2004

In recently, foods must to be contained a health point and fashionable feeling, mayonnaise was called pronoun of dressing must be changes to new products. At this point, new type's dressing oil was research and developing used for raw- materials of 13 kinds. Red pepper seasoning oil, seasoning soy sauce, seasoning solution and seasoning oil were manufactured from soy sauce, vinegar, garlic etc. Manufacturing of new type's dressing oil(DO) could from only blending of these seasoning raw-materials. The result of organoleptic test about vegetables, pizzas and meats was esquired a distinction. According to, it was treated to addition of a functional raw-materials. In this study, it was investigated red pepper DO and DO for diabetic, adult disease patient as well as DO for children, Japanese dining room, general man etc. But these DO products had trouble to layer separation of upper layer and bottom layer, this problem was happened to shaking. This troubles were able to treat gums and emulsifiers.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.4
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• pp.1-7
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• 1999

The demands for the various type of directional coupler, which is for the sampling of the signal levels in mobile communication baseband or transceiver systems, are growing. The proposed dual directional coupler, which has three parallel coupled transmission lines, can provide the dual coupling and good isolation characteristics between the coupling ports. In this paper, the novel analysis method and the design equation of even and odd mode for the dual directional coupler, which is employing the asymmetrically coupled transmission lines, are proposed. Using the proposed method, the dual directional coupler for PCS system has been designed and fabricated. We obtained the desired coupling value and the high directivity of 40dB. Measured results show the validity of this design method.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.11
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• pp.1-11
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• 1999

In this paper, the effects of superstrate on the radiation patterns of dipole on cylindrical bianisotropic substrates were studied. Special constitutive relations are used to describe the bianisotropic properties of a material, such that the Green's function can be formulated. Electromagnetic fields and boundary conditions in spectral region were used to find Green's function of the spectral representation and electromagnetic fields in space region were derived through inverse Fourier transformations of fields in spectral region using asymptotic formula for far zone. Radiation characteristics of axial Hertzian dipole on superstrate loaded cylindrical bianisotropic substrates were obtained. The effects of bianisotropic superstrate on the radiation properties of the antennas including beam scanning, directivity enhancement, dark-region illumination, and on horizon radiation, are discussed.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.10
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• pp.1004-1010
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• 2003

In this paper, the 1/4 wavelength backward-wave directional coupler using coupled lines with finite metallization thickness is described. A mode-matching method, simple and fast approach to the quasi-static analysis, has been used to analyse this structure. The numerical results show that it is possible to overcome the disadvantages of weakly coupling, low directivity, and narrow strip distance non-realizable in the case of 1/4 wavelength backward-wave directional coupler with zero thickness conductor. It is also revealed that thicker metallization causes longer coupler length in the case of backward-wave symmetrical parallel coupled line directional coupler. The finite metallization thickness can be a new parameter for tight coupling in the design of backward-wave directional couplers, which enables us to design more accurate properties of monolithic microwave integrated circuits.

• Journal of the Korean Home Economics Association
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• v.47 no.7
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• pp.97-107
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• 2009

This study investigated the impact of long-term relationship orientation on emotional characteristic in fashion stores and relationship characteristic between middle-aged and senior women and salespeople. This study employed survey method with questionnaire. Data were collected from 579 women who were from the age of forty to seventy. The data were analyzed using statistic methods(SPSS 15.0 and Amos 5.0) such as frequency analysis, cronbach $\alpha$, exploratory factor analysis, second-order confirmatory factor analysis, confirmatory factor analysis and structural equation modelling. The findings of this study were concluded as follows; Firstly, the income significantly affected on emotional characteristics(p < 0.01), but had no significant effect on long-term relationship orientation(p < 0.05). The higher income, the more respondents exhibited positive attitude and sensitive emotional characteristics as a sense of sight, hearing, smell, tactile and feeling to salespeople in the fashion stores. The path of structural equation was implemented as income variables $\rightarrow$ emotional characteristics $\rightarrow$ (relationship with salespeople variables $\rightarrow$ )commitment $\rightarrow$ long-term relationship orientation which turned out to be statistically significant at the 95% confidence level. Secondly, senior group(55~70yrs) was more positive relationship with salespeople compared to middle-aged group(40~54yrs). The precondition of get satisfaction and feeling of being cared from the salespeople were critical for long-term relationship orientation. The path of structural equation was carried out as age variables $\rightarrow$ relationship with salespeople variables $\rightarrow$ commitment $\rightarrow$ long-term relationship orientation which turned out to be statistically significant at the 95% confidence level.

• The Journal of the Korea Contents Association
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• v.14 no.10
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• pp.237-246
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• 2014

The purpose of this study is to examine the relationship between customer orientation and organizational justice in hotel industry. Data were collected from employees who are working in the hotels of Seoul, South Korea and total 321 was used in data analysis. As a result of multiple regression analysis, the distributive justice and interactional justice had a positive effect on the customer orientation. However, the procedural justice had no effect on the customer orientation. Moreover, the type of employee moderates the effect between distributive and procedural justice and customer orientation, but, there was no significant moderated effect of employment type between the interactive justice and the customer orientation.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.9 no.2
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• pp.117-127
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• 2014

The purpose of this study is to examine the factors influencing social performance of social entrepreneurship and Corporate Social Responsibility(CSR) activities. This model tests various theoretical research hypotheses relating to social enterprise, social entrepreneurship, and CSR activities. Social entrepreneurship have been classified as innovativeness, proactiveness, risk-taking, and social value orientation. And CSR activities have been classified as community responsibility, philanthropic responsibility, and environmental responsibility. The proposed model is analyzed to target social entrepreneurs. Valid 115 questionnaires have been collected within three months of 2013. Smart Partial Least Square(PLS) 2.0 have been utilized for deriving the study results. The result of hypothesis testing are as follows. First, social entrepreneurship positively influence community responsibility, philanthropic responsibility, and environmental responsibility. Second, community responsibility, philanthropic responsibility, and environmental responsibility positively influence social performance in social enterprise. The results of this study will provide various implications to improve social performance and social entrepreneurship in social enterprise.

• Communications of Mathematical Education
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• v.27 no.3
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• pp.249-266
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• 2013

The purpose of this research is to investigate the principles for the development of mathematics textbook based on storytelling through literature review, textbook development, and classroom implementation. Mathematics textbook based on storytelling has been developed to help students learn mathematics interesting and meaningful. The principle for the development principles include as the principle of context, process-oriented, communication, and diversity. The developed mathematics textbooks was implemented in high school mathematics classes in order to investigate the effectiveness of the textbooks. We analyzed the data collected by the survey and the interview to find that the mathematics textbook based on storytelling had positive effect on teaching and learning of mathematics. We discussed the implication for the future development and implementation of mathematics textbook based on storytelling.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.6
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• pp.43-55
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• 2013

In this paper, we propose a cylindrical active phased array antenna of Beam Steering Characteristics in the horizontal plane(H-plane) and vertical plane(E-Plane) on the cylinder form array structure. We design the bent dipole antenna of the cylindrical array structure adapted excellent mutual-coupling characteristics, designed and manufactured the cylindrical array antennas and power combiner/divider unit for power dividing and combining on the antenna. The radiating elements array spacing of Cylindrical array antenna were determined to avoid grating lobes at half power beam steering. Beam steering of the antenna was implemented with 6-bit phase shifter in the transceiver and have been designed based on the characteristics the antenna beam steering at -24 degrees to 24 degrees horizontal, vertical 0 degrees to 36 degrees beam steering. A cylindrical active phased array antenna that produced for verification the performance of the antenna are measured radiation characteristics in accordance with beam steering at L-Band.