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A Fully Soft-Switched Single Switch Isolated DC–DC Converter
Minjae Kim,Sewan Choi IEEE 2015 IEEE transactions on power electronics Vol.30 No.9
<P>This paper proposes a soft-switched single switch isolated converter. The proposed converter is able to offer low cost and high power density in step-up application due to the following features: zero-current switching (ZCS) turn-on and zero-voltage switching (ZVS) turn-off of switch and ZCS turn-off of diodes regardless of voltage and load variation; low rated lossless snubber; reduced transformer volume compared to flyback-based converters due to low magnetizing current. Experimental results on a 100 kHz, 250 W prototype are provided to validate the proposed concept.</P>
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The Effect on Training Satisfaction and Training Continuation in the TAEKWONDO Gym Training Program
Minjae Gil J-INSTITUTE 2021 International Journal of Martial Arts Vol.6 No.4
Purpose: The purpose of this study is to provide the basic data for the leaders of Taekwondo to plan effectively their training programs by practically analyzing the training satisfaction and training contin-uation of the trainees according to the training program for the trainees who are practicing Taekwondo. Method: The subjects are elementary school 4-6 graders, middle school students, and high school stu-dents who are training Taekwondo in Jeon-la Province, and the total number of subjects are 305, and the data was processed through frequency analysis, independent t-test, One-Way ANOVA, correlation analy-sis, and linear regression analysis, and the result is as follows. Results: First, regarding the satisfaction of training according to gender, women was higher than men at Taekwondo and body strength(p<.01), (p<.05). Regarding the satisfaction of training according to training period, the trainees who trained for less than 1 year was higher than the trainees who trained for more than 3 years at personality and leadership(p<.05). Regarding the satisfaction of training accord-ing to the objective of training, It was higher than the development of character at body strength(p<.05). Second, regarding the continuation of training according to having official grade, the trainees who have the official grade was higher than the trainees who was delayed at the will of conveying the know-how(p<.05). Regarding the continuation of training according to training period, the trainees who trained less than 1 year was higher than the trainees who trained more than 3 years at the will of conveying the know-how(p<.05). Third, regarding to the correlation between satisfaction and continuation of training according to Taekwondo training program, satisfaction of training showed statistically meaningful posi-tive effect to continuation of training(p<.001). Fourth, regarding to satisfaction of training according to Taekwondo training program, Taekwondo, body strength, and leadership showed statistically meaningful positive effect at every lower grade factor of continuation of training, and personality showed statistically meaningful positive effect at the will of recommendation and the will of conveying know-how. Conclusion: Regarding to the correlation between satisfaction and continuation of training according to Taekwondo training program, satisfaction of training showed statistically meaningful positive effect to continuation of training. regarding to satisfaction of training ac-cording to Taekwondo training pro-gram, Taekwondo, body strength, and leadership showed statistically meaningful positive effect at every lower grade factor of continuation of training, and personality showed statistically meaningful positive effect at the will of recommendation and the will of conveying know how.
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CONSUMER ATTITUDE TOWARD OUTLET STORES AND RETAILER LOYALTY ACCORDING TO CONSUMER SHOPPING TYPEs
Minjae Seo 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.5
Modern consumers have significantly changed their shopping patterns, so that retailers must employ competitive and innovative strategies to counter the many new types of stores such as outlets offering premium services. In addition, customers have become smarter shoppers, refusing to pay more because of brand loyalty, especially when service and price differences have diminished. This study is an analysis of consumer shopping behavior in an effort to find effective marketing strategies to appeal to consumers who shop in outlet stores. Previous research has shown that shoppers may be clustered according to whether they are oriented toward convenience, brands, hedonism, economics, or trends. Different consumer types have different attitudes toward retailer types and also vary in their retailer loyalty. Some types have strong customer loyalty to outlet stores, but others do not. In this study, we examine the relationship between consumer attitude toward the outlet store and retailer loyalty according to consumer shopping types. Hedonism-oriented and economics-orientated consumers are expected to have more interest in outlet shopping than are brand-oriented consumers.
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Manipulating emergent properties of Hund metal: SrRuO₃-SrTiO₃ heterostructure
Minjae Kim,Chang-Jong Kang,Jaeho Han,Bongjae Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
We investigate strain dependent emergent electronic properties of SrRuO₃-SrTiO₃ heterostructure in the theoretical framework of the combination of density functional theory and dynamical mean field theory (DFT+DMFT). The SrRuO₃-SrTiO₃ heterostructure in the presence of strain was recently proposed as a possible platform for studying unconventional superconductivity of Sr₂RuO₄, a paradigmatic Hund metal, in the DFT computation. Here, from the DFT+DMFT method, we show that the SrRuO₃-SrTiO₃ heterostructure has a possibility of strain induced manipulation of low temperature emergent orders of Hund metal, covers ferromagnetic (FM) metal to Neel type antiferromagnetic (NAFM) insulator with orbital polarization. In between these emergent orders in the strain dependent phase diagram of the SrRuO₃-SrTiO₃ heterostructure, we confirmed that there is a regime in which a Fermi liquid quasiparticle experiences competing magnetic interactions of FM, NAFM, and spin density waves, indicating a clue for possible unconventional superconductivity.
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Catherine’s Enlightenment in Northanger Abbey as an English Woman with Subjecthood
Minjae Kim Ewha Institute of English and American Studies 2020 Journal of English and American studies Vol.18 No.1
This paper focuses on reading the world of Jane Austen’s Northanger Abbey as a microcosm of England in the 18th century, and aims to trace how Catherine Morland as a disinhibited subject comes to be enlightened upon realizing that her behavior and mode of judgement that viewed the world blindly in terms of the dichotomy of good and evil pertaining to the imaginary world of the gothic was irrelevant, that “among the English... there was a general though unequal mixture of good and bad”(147). And in the process of coming to be enlightened as such, what Catherine also unwittingly carries out is to serve as the catalyst for Henry Tilney’s personal transformation. I argue that Henry’s change of heart testifies to the change that Catherine as a sincere subject with agency has evoked in the private sphere, the intimate sphere of the Tilney household- or Northanger Abbey that stands in the place of the British empire as the beacon of luxury and improvement. From the perspective that views Catherine not merely as an individual but as an English woman with subjecthood, her revelation is not only that of a personal nature but a social one, an observation of Austen’s that exposes both the ignorance of the previously unreformed Catherine and the vanity of the cosmopolitan General Tilney. Constant throughout the novel is Austen’s brand of irony and satire, rendering which side she takes in the equation ambiguous. Evaluating various characters situated at different points in the spectrum of English national identity and modern improvement, Austen’s work of parody and satire reaches the conclusion that each representation has its limits and vices.
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Minjae Kim,Yeongseon Kim,Sung Hyeon Baeck,Sang Eun Shim 한국탄소학회 2015 Carbon Letters Vol.16 No.1
In this study, in order to improve the thermal and electrical properties of epoxy/graphene nanoplatelets (GNPs), surface modifications of GNPs are conducted using silane coupling agents. Three silane coupling agents, i.e. 2-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane (ETMOS), 3-glycidoxypropyltriethoxysilane (GPTS), and 3-glycidoxypropyltrimethoxysilane (GPTMS), were used. Among theses, GPTMS exhibits the best modification performance for fabricating GNP-incorporated epoxy composites. The effect of the silanization is evaluated using transmission electron microscopy (TEM), scanning electron microscopy, thermogravimetric analysis, and energy dispersive X-ray spectroscopy. The electrical and thermal conductivities are characterized. The epoxy/silanized GNPs exhibits higher thermal and electrical properties than the epoxy/raw GNPs due to the improved dispersion state of the GNPs in the epoxy matrix. The TEM microphotographs and Turbiscan data demonstrate that the silane molecules grafted onto the GNP surface improve the GNP dispersion in the epoxy.
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( Minjae Park ),( Horim Kim ),( Young Su Lee ),( Hyeri Jo ),( Xin Zhao ),( Jae Young Kim ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
Nitrogen oxides (NO<sub>X</sub>) are air pollutants that cause respiratory and cardiovascular diseases which are mainly produced by the combustion process of power plants, incinerators, and automobiles. Selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) are well-known methodologies of reducing nitrogen oxides to nitrogen by ammonia. Anhydrous ammonia (NH<sub>3</sub>, l), ammonia solution (NH<sub>3</sub>, aq), and urea solution (NH<sub>2</sub>CONH<sub>2</sub>, aq) are conventional reductants of SCR and SNCR. Anhydrous ammonia and ammonia solution are highly corrosive resulting high risk of storage and transportation. Compared to the previous two reductants, urea solution is much safer and therefore generally applied to SCR of various systems. To convert urea into ammonia, urea solution requires a pyrolysis process with a temperature of 400℃. Still, the conversion rate of urea solution is low because of by-products produced by complicated reactions. Recently, ammonium carbonate, which decomposes completely into ammonia at 58℃, is being studied as a reductant of SCR and SNCR. However, ammonium carbonate is much more expensive than urea. In this study, to take advantage of both urea and ammonium carbonate, the synergy effect of urea and ammonium carbonate was investigated by comparing the concentration of produced ammonia. Three types of solutions, 4 wt. % urea solution, 2 wt. % ammonium carbonate solution, and a mixture of 4 wt.% urea and 2 wt.% ammonium carbonate solution, were thermally decomposed in a tube furnace. The pyrolysis was performed at a temperature of 200, 300, 350, 400, and 500°C with a residence time of 2 seconds. The produced gas was dissolved into 250 ml of distilled water inside the impinger using air as carrier gas. Ammonia concentration was measured with the Nessler method and UV-Visible Spectrophotometer. This study investigated the synergy effect of urea and ammonium carbonate and how the synergy effect varies depending on the pyrolysis conditions.
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