• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.2
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• pp.26-35
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• 2019

By operating servers, storage, and networking devices, Data centers consume a lot of power such as cooling facilities, air conditioning facilities, and emergency power facilities. In the United States, The power consumed by data centers accounted for 1.8% of total power consumption in 2004. The data center industry has evolved to a large scale, and the number of large hyper scale data centers is expected to grow in the future. However, as a result of examining the server share of the data center, There is a problem where the server is not used effectively such that the average occupancy rate is only about 15% to 20%. To solve this problem, we propose a Virtual Machine Reallocation research using virtual machine migration function. In this paper, we use meta-heuristic for effective virtual machine reallocation. The virtual machine reallocation problem with the goal of maximizing the idle server was designed and solved through experiments. This study aims to reducing the idle rate of data center servers and reducing power consumption simultaneously by solving problems.

• Journal of the Korean Society of Industry Convergence
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• v.7 no.3
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• pp.273-279
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• 2004

There are several ways to solve parking problem in the downtown One of them is to manage parking efficiently, that is, to raise use-efficiency of parking place and to help drivers to select easily. When we manage the parking place m the block efficiently, It can prevent disproportion that some parking space is over capacity and the other parking one is under. It causes not only the disproportion of economic efficiency but also the congestion of local road. The precondition to manage parking efficiently is to analyse the parking characteristics. In this study we found out the characteristics of parking vehicles by analyzing the turnover per parking mesh and occupancy rate And we build up total D/B by collecting every information about parking space. We developed the Parking Management System by using GIS with D/B and digital map. The efficient Parking Management System is for convenience of drivers and efficient usage of parking space. And this system is also the basic study to be developed as the total Parking Management System by upgrading every information.

• Journal of the Korean housing association
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• v.13 no.6
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• pp.133-140
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• 2002

This study researches the dwelling satisfaction about apartment remodeling by inspecting ten apartments located in Gwang-Ju, Jun-Nam province. The method of study is to use the field study method, which is based on cultural anthropology, and the participant observation method at same time. According to the research, we find those things as they follow. First, the participation of residents and the mutual agreement are necessary in the process of the selecting a company. Furthermore it's hard to solve the problem about an uniform design and an inferior construction. These things are the most serious factor in dissatisfaction of resident environment. Second, the space of storage and veranda should be separated for the proper functions and the space for laundry is necessary. The rooms, except bedroom, and the bathroom in the main living room should be used for practical application because they are not used so often and if we make the veranda as a inner space, we've got to make a gardening plan, too. Through this research we find out that the participation of an expert company and residents for enough communication and mutual agreement and the space plan for the satisfaction of occupants are necessary for the proper apartment remodeling.

• International Journal of Fuzzy Logic and Intelligent Systems
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• v.6 no.2
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• pp.167-172
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• 2006

As ubiquitous devices are fast spreading, the communication problem between humans and these devices is on the rise. The use of context is important in interactive application such as handhold and ubiquitous computing. Context is not crisp data, so it is necessary to introduce the fuzzy concept. The proxity relation is represented by the degree of closeness or similarity between data objects of a scalar domain. A context manager of context-awareness system evaluates imprecise queries with the proximity relations. in this paper, a systematic proximity elicitation method are proposed. The proposed generation method is simple and systematic. It is based on the well-known fuzzy set theory and applicable to the real world applications because it has tuning parameter and weighting factor. The proposed representations of proximity relation is more efficient than the ordinary matrix representation since it reflects some properties of a proximity relation to save space. We show an experiments of quantitative calculate for the proximity relation. And we analyze the time complexity and the space occupancy of the proposed representation method.

• Journal of the Korean Institute of Rural Architecture
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• v.9 no.1
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• pp.9-16
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• 2007

Educational Facility has a specialty that similar design is repeatedly taken place so the importance of POE(Post Occupancy Evaluation) is increased for the improvement of problem appeared at the former projects. The POE could provides help to the design of next project and the direction when the need of remodeling is faced. Through the process of POE, the repeat of design mistakes could be prevented and the good information related with building efficiency and other problems could be applied to the design of next school project . In this study, the POE of Manbalro(barefoot) toilet of D Elementary school in rural area of H county is performed. The toilet is renovated as an educational environment improvement project of H county educational office in Chungcheong Namdo Province. The study is focused on the user's behavior at Manbalro toilet for carrying out indicative POE by the subjective response of user's. From the research, several being reformed items is proposed however the toilet is evaluated as a successful project that design purpose of initial stage is applied well.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2008.04a
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• pp.180-184
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• 2008

Fire prevention strategies should be aimed at the prevention of structured fire since average annual rates of structured fire have been increased due to economic growth resulted in increasing high rise buildings and multipurpose occupancies over the past ten years. Hence, this study mainly focused on the improve method and problems in the field test of fire detector in compliances with experimental consideration. And it leads us to the flowing conclusions : Firstly, it is necessary to formulate a safety standards on field test. Nowadays, the test enforced in many ways without formulated standard. Therefore it is necessary to be complete the arrangements standardized and how to do the test with formulated safety standards. Second, it is necessary to establish the regal guidance with regard to inspection equipment, ie density, component and temperature of test equipment should be considered. Also the equipment is need to be standardized and improved. Third, fire inspector's competency in their practice should be enhanced. The problems arising from the lack of knowledge and competence regarding inspection could be settled by providing professional education to ensure proficiency in their practice. Specialized training, as has been noted, should be offered in accordance with occupancy type, scale and fire protection system in the fire facilities.

• Journal of Communications and Networks
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• v.16 no.2
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• pp.217-226
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• 2014

In this research, we study the problem of opportunistic spectrum access (OSA) in a time-varying environment with fading channels, where the channel state is characterized by both channel quality and the occupancy of primary users (PUs). First, a finite-state Markov channel model is introduced to represent a fading channel. Second, by probing channel quality and exploring the activities of PUs jointly, a two-dimensional partially observable Markov decision process framework is proposed for OSA. In addition, a greedy strategy is designed, where a secondary user selects a channel that has the best-expected data transmission rate to maximize the instantaneous reward in the current slot. Compared with the optimal strategy that considers future reward, the greedy strategy brings low complexity and relatively ideal performance. Meanwhile, the spectrum sensing error that causes the collision between a PU and a secondary user (SU) is also discussed. Furthermore, we analyze the multiuser situation in which the proposed single-user strategy is adopted by every SU compared with the previous one. By observing the simulation results, the proposed strategy attains a larger throughput than the previous works under various parameter configurations.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.26 no.4
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• pp.1-12
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• 2018

Baggage Handling System(BHS) is an important element of ground operation services and the importance is further emphasized as air demand increases and passengers change. If there is a problem with departure baggage handling, the aircraft's gate occupancy time will be longer than the initial plan, resulting in congestion of the anchorage leading to final passenger terminal and mooring and road congestion and arrival or It is delayed until the processing of the baggage of the connecting flight and it can cause an economic loss such as confusion in the operation of the airport. The purpose of this study is to investigate the effect of the perception of service quality of BHS users on public Institutions performance through user satisfaction, user performance, and user loyalty. Analysis results using Structural Equation Model was suggested and its implication was discussed in the conclusion.

• Journal of Internet Computing and Services
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• v.24 no.1
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• pp.9-15
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• 2023

Single-Page Application(SPA) requires data transformation for communication with RESTful API. The Backend for Frontend(BFF) pattern handles this transformation in the server, but there is some problem that increases the number of communication and makes development and distribution difficult. In this study, we propose an architecture that maps the ViewModel of SPA and the model of RESTful API directly in SPA. The proposed architecture automatically generates a mapping model between the RESTful API model and the ViewModel using the OpenAPI specification, which is the document model of the RESTful API. The data transfer component of SPA automatically converts RESTful API data and ViewModel using the created model. As a result of comparison with the existing BFF method through case study, the proposed architecture showed higher development productivity than BFF, and as a result of load tests, it recorded about 6% lower server CPU occupancy compared to BFF.

• Journal of the Korean housing association
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• v.26 no.2
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• pp.13-20
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• 2015

Single household is expected to be the typical form of future Korean elderly household from reduction of household size and rapid growth of the elderly. As Japanese solve the same problem with Senior Sharehouse, a case study on Senior Sharehouse in japan focused on the Spatial Arrangement and Spatial Composition could suggest an potential applications in Korea. In conclusion, compare to Korea, the Senior Sharehouse in Japan supplies additional $7.5{\sim}9.3m^2$ more space to support the physical movement of the elderly and to help the elderly to solve various functions at one space. The independence and privacy of residents are also assured by supplying single occupancy. Space analysis shows that public space is as spacious (47.3~55%) as personal space. The result of the Space analysis suggests that the sharehouse provides rational ratio of space to assure residents' independence. It was supposed that the center type would be the main stream of the Spatial Arrangement for sharehouse considering its characteristic of sharing space. But, the Senior Sharehouse in Japan prefers corner type. The guarantee of personal space is being considered as a important characteristic. As a result of case analysis, Senior Sharehouse can be a proper type of house for single elderly household and present study can be used for the baseline data to solve the residence problem for single elderly household in Korea.