• Journal of the Korean housing association
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• v.11 no.1
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• pp.137-149
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• 2000

This study examined to find out for Common facilities and services of apartments for the preschool children to grope for the way of more suitable environments about increasing the apartment house in Korea. According to the purpose of this study, the subject survey was confine to housewives, who have preschoolers, in the apartment of metropolitan Seoul and its newly developed satellite cities. The major findings were as followers: 1)As a result of analysis by each item for common facilities and service according to social and demographically characteristics of the subjects, the difference in demand between groups was recognized in employment of housewives, monthly average house income, and age of housewives. 2)For the preschool children housewives desired the community child care be placed at the first story of apartment and kindergarten is placed at a separate space, and playhouse is located at the first story or separate space. 3)For the preschool children housewives desired the apartment located at sub-city then the city or rural area etc.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.383-384
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• 2015

This paper presents a new space vector modulation (SVM) method for indirect matrix converters (IMCs) to reduce commonmode voltage as well as minimize output current ripple in a high voltage transfer ratio. In the proposed SVM, the three-vector modulation scheme is used in the rectifier stage, while the nonzero state modulation technique, where the three nearest active vectors are selected to synthesize the desired output voltage, is applied to inverter stage to reduce the CMV. The proposed SVM method can significantly reduce the output current ripple and common-mode voltage of the IMC without any extra hardware. Simulated results are provided to demonstrate the effectiveness of the proposed SVM method.

• Nonlinear Functional Analysis and Applications
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• v.27 no.2
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• pp.271-287
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• 2022

In this article, we shall prove a common fixed point theorem for two weakly compatible self-maps 𝒫 and 𝔔 on a dislocated metric space (M, d^*) satisfying the following ξ-weakly expansive condition: d^*(𝒫c, 𝒫d) ≥ d^* (𝔔c, 𝔔d) + ξ(∧(𝔔c, 𝔔d)), ∀ c, d ∈ M, where $${\wedge}(Qc,\;Qd)=max\{d^*(Qc,\;Qd),\;d^*(Qc,\;\mathcal{P}c),\;d^*(Qd,\;\mathcal{P}d),\;\frac{d^*(Qc,\;\mathcal{P}c){\cdot}d^*(Qd,\;\mathcal{P}d)}{1+d^*(Qc,\;Qd)},\;\frac{d^*(Qc,\;\mathcal{P}c){\cdot}d^*(Qd,\;\mathcal{P}d)}{1+d^*(\mathcal{P}c,\;\mathcal{P}d)}\}$$. Also, we have proved common fixed point theorems for the above mentioned weakly compatible self-maps along with E.A. property and (CLR) property. An illustrative example is also provided to support our results.

• Journal of the Korean housing association
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• v.16 no.5
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• pp.117-125
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• 2005

Since Mapo Apartment was introduced as a new urban housing type in the early sixties, apartment has been a typical urban housing in our country. In these days, according to various life-styles and new attitudes about the quality of life, apartment has been developed in various types like high rise residential complex and apartments with special themes. This study has been focused on the transition of modem urban housing in France. The origin of a word, apartment, has been defined and history of apartment in French urban life has been analyzed focusing on the common space and community facilities. Representative apartments in the 18th, 19th and 20th century were selected and comparatively analyzed. Especially in the 19th century, urban housing for working class had been a major concern among the communist and the bourgeoisie and has its own characteristics relative to each other. The characteristics shown in the apartment by the communist in France have been followed in the Korean apartments since 1960's, then the recent trends are rapidly changing in the housing market in Korea. Thus, the findings of this study can be very useful to understand the recent changes of diverse housing types in our society and also be very helpful to prospect our urban housing types in the future according to the changes of new lift styles.

• Journal of Power Electronics
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• v.16 no.6
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• pp.2258-2271
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• 2016

In this paper, some crucial performance characteristics related to the operational reliability of the post-fault Pulse Width Modulated (PWM) rectifiers, such as line current harmonic distortion, Common Mode Voltage (CMV), and current stress on the capacitors, are fully investigated. The aforementioned performance characteristics of post-fault rectifiers are highly dependent on the utilized space vector modulation (SVM) schemes, which are also examined. Detailed analyses of the three most commonly used SVM schemes for post-fault PWM rectifiers are provided, revealing the major differences in terms of the zero vector synthesis approaches. To compare the performances of the three SVM schemes, the operating principles of a post-fault rectifier are presented with various SVM schemes. Using analytical and numerical methods in the time domain, the performances of the line current distortion, common mode voltage and capacitor current are evaluated and compared for each SVM scheme. The proposed analysis demonstrates that the zero vector synthesis approaches of the considered methods have significant impacts on the performance characteristics of rectifiers. In addition, the advantages and disadvantages of the proposed SVM schemes are discussed. The experimental results verify the effectiveness and validity of the proposed analysis.

• Journal of Power Electronics
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• v.16 no.3
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• pp.936-945
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• 2016

Large magnitude common-mode voltage (CMV) and its variation dv/dt have an adverse effect on motor drives that leads to early winding failure and bearing deterioration. For matrix converters, the switch states that connect each output line to a different input phase result in the lowest CMV among all of the valid switch states. To reduce the output CMV for matrix converters, this paper presents a new space vector modulation (SVM) strategy by utilizing these switch states. By this mean, the peak value and the root mean square of the CMV are dramatically decreased. In comparison with the conventional SVM methods this strategy has a similar computation overhead. Experiment results are shown to validate the effectiveness of the proposed modulation method.

• Korean Institute of Interior Design Journal
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• v.24 no.1
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• pp.72-81
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• 2015

The change towards meeting diverse customer needs has started to affect the hotel industry as well. Design hotels emerged as customers demanded differentiated lodging experiences they could not fulfill at franchise hotels which were uniform in style everywhere in the world. Design hotels are meant to provide a new concept of space through unique design sensibility and work of designers, which highlighted the role of interior design. This research analyzes the characteristics of indoor space expressed in design hotel common spaces by the French designer Andree Putman, also known as the founder of boutique hotels and the concept of design hotels. As the original founder of the concept of design hotels, Putman's scope of work stretches wide, from interior design to product design. She is also one of the few French designers with a modernist inclination. The research runs a review on previous literature, characteristics of design hotels according to design tendency, and the association with characteristics of indoor space designed by Andree Putman, followed by case analyses extracted by analyses on design characteristics of common spaces she has designed. The analysis reveals that she creates comfortable yet elegant space, using contrast and fusion arising from negotiation of design styles to interpret space, the sense of spatial balance and understated expression of order through symmetrical structures, diverse creation of space through geometric structuring, highlighting indoor space by utilizing lights as objects, and the heterogeneous harmony achieved by contrasting juxtaposition, and understated formativeness. It is expected that study results would be utilized as methods of new designs of interior space in design hotels.

• The Korean Journal of Air & Space Law and Policy
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• v.20 no.2
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• pp.293-306
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• 2005

In order to bridge the digital divide issues in the Asia Pacific region, Japan initiated the Asia Broadband Program, during implementing E-Japan and U-Japan Plans with collaboration among Asia Pacific Counties. This paper describes first joint experiments that were undertaken in Japan, Singapore and China. Then this paper also describes Japanese efforts to build space infrastructure for development of ICT Society in the Asia Pacific region for further international cooperation to bridge the digital divide Article 1, para. 1, of the Outer Space Treaty of 1967, calls for exploration and use of outer space to be carried out for the benefit and in the interests of all countries irrespective of their degree of economic or scientific development. The augmentation of common benefit from space communication could contribute to bridge the digital divide issues in developing countries in Asia Pacific region. Accordingly, space- infrastructure building would be very important to implement common benefit among countries concerned through international cooperation and collaboration

• The Transactions of the Korean Institute of Power Electronics
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• v.19 no.6
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• pp.488-493
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• 2014

This paper presents a carrier-based pulse-width modulation(PWM) method for reducing the common-mode voltage of a three-level four-leg converter. The idea of the proposed PWM method is intuitive and easy to be implemented in digital signal processor-based converter control systems. On the basis of the analysis of space-vector PWM(SVPWM) and sinusoidal PWM(SPWM) switching patterns, the fourth leg pole voltage of the three-phase converter called "f leg pole voltage" is manipulated to reduce the common-mode voltage. To synthesize f leg pole voltage for the suppression of the common-mode voltage, positive and negative pole voltage references of f leg are calculated. An offset voltage is also deduced to prevent the distortion of a, b, and c phase voltages. The feasibility of the proposed PWM method is verified by simulation and experimental results. The common-mode voltage of the proposed PWM method in peak-to-peak value is 33% in comparison with that of the conventional SVPWM method. The transition number of the common-mode voltage is also reduced to 25%.

• Journal of the Korean Society of Clothing and Textiles
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• v.36 no.9
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• pp.901-915
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• 2012

This study comparatively analyzes the characteristics, changes, and differences in class-based costume typology according to a concept of $17^{th}$ and $18^{th}$ century common people in France. The methods and contents are as follow. First, the scope of common people is grasped according to the historical background and a concept of $17^{th}$ and $18^{th}$ century common people in France. Second, through considering a prior research on analyzing the data of ancient documents on the economy of clothing, it classifies common people into bourgeoisie, urban common people, rural common people, and the destitute. It then examines diachronic evolution, and class-based synchronic difference in the consumption of $17^{th}$ and $18^{th}$ century common people's costumes in France. Third, it analyzes the appearance frequency by period according to type of common people's costumes, which were shown in pictorial materials with 283 sheets of engravings and 54 pieces of paintings; in addition, it reconstructs the succession and expansion in typology. It grasps differences and changes in morphology by class, space, and period of typology for common people's costumes. Common people's consumption of costumes was understood to have grown in qualitative aspects as well as a rise in the whole clothing demand. A class-based structure formed and indicated that a fashion cycle existed. As a result of analyzing common people's clothes (shown in pictorial materials of the $17^{th}$ and $18^{th}$ century) 41 items were grasped by gender and according to costume kind. Typology in common people's costumes (classified into bourgeoisie, urban common people, rural common people, and the destitute) showed a change by period. A change in typical costume typology was accepted more by the bourgeoisie than by urban and rural common people, and was accepted more by rural communities than by urban populations. Thus, a difference was formed through an expansion with a temporal difference that depended on class and space.