• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.17 no.8
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• pp.708-719
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• 2007

In case of indoor gymnastics training floor, in view of its characteristics, since it is simultaneously required the related smooth communication between the coach and the player, also the acoustic performance regarding to the clearness of music, besides the sport activity, the consideration about the acoustic character has entered the stage as an indispensable element. On such viewpoint, recently constructed dome-typed gymnastic training floor was optimized acoustic design with remodeling through acoustic simulation test. And acoustic satisfaction degree and reaction was attempted to investigate about the gymnastics training floor estimating value of human's psychological(sensual) degree using auralization that enables to experience the virtual sound field at the stage of design. As the result of investigation about the research on the space of object, it could be known that the valuation regarding to the acoustic performance of 'after-improvement' was distinctly more refined than that of 'before-improvement'. It is now considering that such result of the study can be utilized as the useful data which enables to improve the retrenchment effect of the construction cost as well as the acoustic capability, by means of the prediction control on the acoustic problem from the stage of design, for the occasion when the similar indoor sport gymnasium is planning to build for the near future.

• Computers and Concrete
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• v.19 no.5
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• pp.509-514
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• 2017

Concrete retaining walls are the most common types of geotechnical structures for controlling instable slopes resulting from lateral pressure. In analytical stability, calculation of the concrete retaining walls is regarded as a rigid mass when its safety is required. When cracks in these structures are created, the stability may be enforced and causes to defeat. Therefore, identification, creation and propagation of cracks are among the important steps in control of lacks and stabilization. Using the numerical methods for simulation of crack propagation in concrete retaining walls bodies are among the new aspects of geotechnical analysis. Among the considered analytical methods in geotechnical appraisal, the boundary element method (BEM) for simulation of crack propagation in concrete retaining walls is very convenient. Considered concrete retaining wall of this paper is Pars Power Plant structured in south side in Assalouyeh, SW of Iran. This wall's type is RW6 with 11 m height and 440 m length and endurance of refinery construction lateral forces. To evaluate displacement and stress distributions (${\sigma}_{1,max}/{\sigma}_{3,min}$), the surrounding, especially in tip and its opening crack BEM, is considered an appropriate method. By considering the result of this study, with accurate simulation of crack propagation, it is possible to determine the final status of progressive failure in concrete retaining walls and anticipate the suitable stabilization method.

• Journal of IKEEE
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• v.6 no.1 s.10
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• pp.1-9
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• 2002

Converged LAN accepts diverse traffics so that performance analysis is very important for successful development of converged LAN. In this paper, we develop simulation program using SALM II and simulate queue management scheme and scheduling algorithm for converged LAN. The result of simulation shows the effect of performance for cyclic service algorithm larger than priority algorithm using weight. And queue management can be easy by implementation of Back Pressure scheme.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.6
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• pp.285-289
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• 2012

In this paper, the farm information system was designed by ubiquitous computing. The irrigation system was set up for growing forest products. Also, the integrated sensing system with the radar sensors would be constructed for sensing the temperature, the humidity and the direction of the wind, ect. And the monitoring programs for workers in the fields were provided for the control and the monitoring the growing conditions of the forest products. Finally the database was constructed for the total monitoring and management system, so the data from sensor system was stored in the database sever for analysing growing environment.

• Journal of the Society of Naval Architects of Korea
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• v.53 no.4
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• pp.282-289
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• 2016

Traditional construction method of the stern tube is difficult to control the process and needs excessive working hours. Recently in order to resolve these issues, stern tube unit has been installed for some commercial vessels. The stern tube unit is a monolithic structure of bush and related components. The purpose of this study is to carry out a feasibility study for application of the stern tube unit for a 174K twin skeg LNG carrier. In this study, a 19,000 TEU container carrier installing the stern tube unit has been selected to compare with the deformations of stern for a 174K twin skeg LNG carrier.

• 한국태양에너지학회:학술대회논문집
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• 2012.03a
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• pp.549-552
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• 2012

Recently the world is trying to reduce carbon emissions for global warming. Reducing use of fossil fuels can decrease carbon emission. In this reason the construction field has tried to reduce the use of fossil fuels relating to heating and cooling of buildings. An energy loss through the window system is about 10 to 30 percent of energy consumption of the whole building. The use of window film insulation is increasing to control the heat loss at the windows. The window film insulation absorbs solar radiation and makes the surface temperature of windows high. In this study, window surface temperature is measured, and an impact on indoor air is identified after attaching window film insulation. Finally, we found that cooling load decreases through simulation.

• Journal of Sasang Constitutional Medicine
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• v.24 no.2
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• pp.47-53
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• 2012

1. Objectives : The aim of the present study was to describe the Korea Constitutional Multicenter Bank (KCMB), which was various clinical data bank for scientific advancement of constitutional diagnosis and treatment. 2. Methods and Results : The KCMB is based on the 28 multi-institute cooperative clinical research networks including domestic and international institute. Since the KCMB was founded in 2006, data have been accumulated from 10,412 subjects. The KCMB consists of three parts: The clinical constitutional data, the measurement data, and the biological data. The method of data entry is via web based electronic Case Report From (eCRF). The eCRF has been developed and programed to ensure the efficient entry of data. We also developed coding manual, ongoing quality control assessment to obtain high-quality data. 3. Conclusions : The KCMB with various data contribute to providing the scientification of Sasang Constitutional Medicine.

• Proceedings of the KSR Conference
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• 2001.10a
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• pp.299-303
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• 2001

In this paper, we introduce the Partial Half-Through Type Plate Girder Bridge proposed by Hyundai Development Co. and KRTC Consortium in Turn-Key Based design last year, and this type of bridge may be adapted to the railway bridge under similar conditions. This bridge across the North Han River was to be concerned its find view and the protection of water source. For its location is inside the dam, it required the long span and the clearance for the flood also. Its new composite section was able to diminish the deflection and vibration. Its shop-fabrication could control its quality easily, and might to be launched. This structural type have satisfied its functions, construction situations, and overall safeties, so this is the field-oriented type. However the composition and connections of the proposed members are different to the recent forms, and difficult to be applied to present specifications. Therefore it requires a certification on the application for more safety by not only analytical verifications but also experimental studies. Nevertheless, this type of bridge may have some more applications from now on.

• Journal of the Korean Society for Railway
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• v.9 no.3 s.34
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• pp.282-290
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• 2006

In the current train operation system, large scaled stations like Cheongnyangni and Yongsan are not remote controlled from the central operator but manually by local operator. It is because there are so many entering and exit of trains between depot and mainline which are operating through the large scaled stations and it is very effective to traffic flow on the mainline. Therefore, Kyong Bong Technology Co., Ltd. (KBTech) and Korea Railway Research Institute (KRRI) are continuing the research and development to import 'Autonomous Decentralized System (ADS)'as part of a new train operation control system which is a national policy project of MOCT (Ministry Of Construction & Transportation). The concept of the 'Autonomous Decentralized System (ADS)' has born in 1970's in Japan by the influences of molecular biology. The special features of ADS are being a system that able to do the online expansion, online maintenance and fault tolerance. This thesis introduces the concept of technology of ADS and also describes the system designing & development to apply with large scaled stations.

• 한국지구물리탐사학회:학술대회논문집
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• 2003.11a
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• pp.504-510
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• 2003

This study has been carried out to evaluate the passive treatment systems for acid mine drainage in Korea and to suggest, if possible, the method for the improvement. 35 passive treatment systems in 27 mines have been constructed since 1996. SAPS, being the main process, was combined with more than one of processes such as anaerobic wetland, aerobic wetland, and oxidation pond for the construction of passive treatment system. Problems observed during the operation include the poor sulfate removal ratio, overflow, leakage, unusabless of the whole system, and inefficiency. The reasons of the poor sulfate removal ratio are believed that the low temperature during the winter prohibits the SRB activity and HRT for bacterial sulfate reduction is insufficient. An alternative method In Adit Sulfate Reducing System which enables to keep the temperature constant at about $15^{\circ}C$ was suggested. IASRS is the methods of placing the SAPS inside the adit, which enables the temperature around the system constant can be maintained. The experiments using the laboratory scaled model systems made up of four sections showed high efficiencies in pH control and metal removal ratios, but showed still low sulfate removal ratio of about $23\%$ also with high COD at the beginning of the operation.