• The Transactions of the Korean Institute of Electrical Engineers P
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• v.59 no.4
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• pp.345-350
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• 2010

This paper presents a Photovoltaic Generation system using a Space Vector Modulation. PWM voltage source inverter using inverter consists of complex type of electric power converter to compensate for the defect, that is solar cell cannot be developed continuously by connecting with the source of electric power for ordinary use. It can cause the effect of saving electric power, from 10 to 20[%]. Synchronous signal and control signal was processed by the 56F8323 microprocessor for stable modulation. Also, Waveforms output current and voltage of system controlled so that phase conforms and can supply electric power that stabilize by the unit power factor.

• Structural Engineering and Mechanics
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• v.9 no.3
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• pp.289-304
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• 2000

This study discusses on the experimental and analytical results of the global buckling tests, carried out on aluminum alloy double layer space grids composed of tubular members, ball joints and connecting bolts at the member ends, with the purpose of demonstrating the effectiveness of a simplified analysis method using an equivalent slenderness ratio for the members. Because very few experiments have been carried out on this type of aluminum space grids, the buckling behavior is investigated experimentally over the post buckling regions using several space grid specimen with various values for the member slenderness ratio. The observed behavior duping the experiments is compared with the analytically obtained results. The comparison is made based on two different schemes; one on the plastic hinge method considering a bending moment-axial force interaction for members and the other on a method using an equivalent slenderness ratio. It is confirmed that the equivalent slenderness method can be effectively applied, even in the post buckling regions, once the effects of the rotational rigidity at the ball joints are appropriately evaluated, because the rigidity controls the buckling behavior. The effectiveness of the equivalent slenderness method will be widely utilized for estimation of the ultimate strength, even in post buckling regions for large span aluminum space grids composed of an extreme large number of nodes and members.

• Journal of Power Electronics
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• v.16 no.2
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• pp.455-463
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• 2016

This paper proposes a compensation method to improve the distorted space vectors when a 3-level Neutral Point Clamped (NPC) inverter has an unbalanced neutral point voltage. Since both the neutral point voltage of the DC link and the space vector of a 3-level NPC inverter are closely related depending on the output load connecting state, a distorted space vector can occur when the neutral point voltage of a 3-level NPC inverter is unbalanced. The proposed method can improve the distorted space vectors by adjusting the injection time of the small and medium vectors and by modulating the amplitude of the carrier waveforms. In this paper, the proposed method is verified by both simulation and experimental results based on a 3-level NPC inverter.

• Journal of Service Research and Studies
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• v.2 no.2
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• pp.115-123
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• 2012

Part of public arts, environmental sculpture not only enhance the beauty of a building, but also a landmark having intimate values with the city environment and symbolic meanings. 'Space storytelling' is not only a connecting bridge between the space and human, but also plays a role in promoting creation of story like a catalyst. Storytelling is expanding to many related industries and one of which is artistic structure, and the storytelling of residental space is getting widely applied to establish the competitive superiority. The purpose of this study involves logically examination the service deliver process of space storytelling based on the residential space. And this study expected to research the influencing factors about purchase and service delivery process of artistic structure.

• Korean Institute of Interior Design Journal
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• v.23 no.6
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• pp.178-186
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• 2014

Recently, a lower levels space has turned into a mediating space where people can experience urban spaces directly and it has revitalized communication between the city and company and also it has changed itself newly. In addition, this space which is connecting interior and exterior spaces of company's buildings can attract people living in the downtown as shock-absorbing and transitional space and it is getting more important part in urban context these days. Through case studies of corporate office space planning characteristics derived lower levels and to provide direction for the lower levels of the corporate office space planning purposes of the present study. Therefore, I establish the concept of the public good corporate office space and transition space, the concept of transition through the first Theoretical Methods. I investigate the properties of the transition area is used as the target for completion of the current construction culture destination since 2000, winning the corporate office, I have been talking about the characteristics of the corporate office along the lower part of the last PPS assessment criteria to apply to the building. PPS by applying an assessment factor can be derived for building enterprise case studies and analysis of the results the following conclusions about the use of publicity and transition space. First, lower levels of corporate office space had been applied to the use and activity in a very important project characteristics. Second, corporate office space, lower levels of access and linkages are important. Finally, in terms of public characteristics transition space is a important characteristic for low-rise space of headquarter buildings.

• Korean Institute of Interior Design Journal
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• no.6
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• pp.38-44
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• 1995

The purpose of this paper is to show that a shape pro-duced by natural factors such as weather, environments, etc., can be introduced into the emotion of a design, and to make a design process by planning a Korean image and characterizing its concept. Human beings, nature, man-made objects, and society have their own functions in an environmental structure. When all their functions are kept in working order, human beings come to discover orderliness out of which they can absorb pleasure. They cannot look into their own inside but they can trace back in their memories a variety of panoramic experiences which have been embed-ded onto their identity during their lifetime interactions with an empirical world. Children first acquire a way of cognition in the space, a comprehensive premise, connecting a specific place and an object of cognition. Such subconsciousness forms sky-lines of mountains, seas, and trees under the sky, and produces axis lines and beehived domes under the influ-ence of natural, cultural, and social factors, forming a folk culture. A subconscious composition of existential space is extended. A subconscious composition of existential space is extended to the areas of environmental design, product design, and fashion design. The development of a concept of place and space as a system is a necessary condition for discovering an existential foothold.

• Korean Institute of Interior Design Journal
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• v.27 no.2
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• pp.106-117
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• 2018

The purpose of the study is to present the social welfare center planning factors of space for promoting intergenerational exchanges between the elderly and children. To achieve the purpose, the study conducted a survey of professionals on the importance of planning factors. The results are as follows. First, it is surveyed that less high are Korean social welfare center planning and availability extents of space for intergenerational exchanges, while less no profound are the necessity and concern of such spaces. The result suggests that social welfare centers need a concrete planning of space for intergenerational exchanges. Second, it is identified that in order to promote intergenerational exchanges, there need to plan planning factors of each space, especially with focus on 'outdoor space' and 'specific space.' Third, it is revealed that regarding the importance of factors of 'specific space,' physical supports account for the high rates; architectural factors providing free space contribute to the supports of physical development; and decorative factors giving visual effects could be helpful for behaviors. Fourth, it is unveiled that the supports of physical behaviors are of the most importance in 'connecting space'. This would be planned as a path that gives a free access in spaces, with attention being paid to safety. Lastly, it is shown that in the case of 'outdoor space,' the supports of physical development are of the most importance. Given the fact that 'outdoor space' offers a wider scope of activities, and accommodates various available elements in connection with surrounding environments, it is considered that the space would be of help for intergenerational interactions. The study is expected to be utilized as the preliminary data which proposes the social welfare center planning factors of space for promoting intergenerational exchanges between the elderly and children.

• Journal of the Korean Institute of Educational Facilities
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• v.24 no.6
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• pp.55-64
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• 2017

This study analyzes the common space of the high schools before and after the decade of 2009 which starts Subject-centered clusters school plan, and proposes the direction of common space planning for the future. Based on the floor plans of high schools awarded as excellent school facilities every year, first, types and numbers of common space, second, area ratio between common space and program space and also moving space and staying space, third, space connections were analyzed for tracking the change of the relationship between common, staying and program spaces. The study results demonstrated that types, numbers and area ratio of the common space were increased as the years go on. Especially, the area ratio of staying space was dramatically increased after 2009 and this result was caused by the home-base, alcove space, and hall that were adopted for subject-centered clusters planning after 2009. Connecting diagram of staying area and program spaces also shows the spaces related to staying area were changed from a classrooms and administrative office etc. to a library, gym, and seminar rooms etc. In case of staying area, it would have a value as a common space for various student activities such as group activities, meetings, and multi-uses. Because student activities would be changed and encouraged depending on the location, sizes and program spaces around staying area, it should be emphasized that the planning for staying area is critical for future school design.

• Journal of Korean Society of Rural Planning
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• v.19 no.1
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• pp.209-220
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• 2013

The aim of this study is to establish the planning of Biando fishing village where can be well-known fishing villages in Korea. In order to have highlighted a tourist attractions, the identities of Biando fishing village were investigated natural resources, amenity resources, ecological resources and so on. Based on these resources, the planning of Biando fishing village considers to between community facilities and community spaces. To create the attractive fishing village, the study was underwent 5 process. The 5 process is followed as; 1) Choose the planning site 2) Literature review 3) Fields survey 4) Site Analysis 5) Spatial Planning. Through those results, Biando fishing village were classified 4 spaces. Each 4 spaces have got their own theme. The main focus of 4 spaces was associated with communicating between space and space, connecting between space and space. The first space theme was "Meeting the geese" and the main focus of planning was entry space creating. The second space theme was "Walking in the heaven" and the main focus of planning was ecological resource exploring space and relaxing space. The third space theme was "Secret of shingle beach" and the main focus of planning was leisure and experience space. Last space theme was "Falling into the sea" and the main focus of planning was trekking and leisure space.

• Korean Journal of Computational Design and Engineering
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• v.18 no.1
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• pp.49-57
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• 2013

In this paper, orthogonal projection of a point onto a 2D planar curve is discussed. The problem is formulated as finding a point on a curve where the tangent of the curve is perpendicular to the vector connecting the point on the curve and a point in the space. Existing methods are compared and novel approaches to solve the problem are presented. The proposed methods are tested with examples.