• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.75.1-75.1
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• 2010

This research presents a fuel cell simulator for control logic verification and operator training. Nowadays, power industries are focusing on clean energy as a response to new policy. The fuel cell can be the solution for clean energy, but operating technology is not well developed compared to other conventional power plans because of its short history. Therefore we need a simulator to verify the new control strategy and train operators, because the price of a real fuel cell system is too high and mechanically weak to be used for these kind of purposes. To develop the simulator, a 300 KW MCFC(Molten Carbonate Fuel Cell) system was modeled with stack, BOPs(pre-reformer, steam generator, etc) and mechanical components(valves, pipes, pumps, blowers, etc). The process model was integrated to emulated control system and HMI(Human Machine Interface). A static load and open loop tests were conducted for verifying the accuracy of the process model, since it is the most important part in the simulation. After verifying the process model, an automatic load change and start-up tests were conducted to verify the performance of a new control strategy(logic and functional loops).

• Journal of Environmental Science International
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• v.9 no.6
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• pp.443-447
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• 2000

Chonan and Asan city have been a focal point due to rapid development as the first station for Express Railroad and key cities West Coast Development Region. Gokgyo stream adjacent to the cities plays an important role as a drainage channel for an agriculture and a discharger of urban storm water. Waster quality of the stream has been deteriorating caused by pollution sources such as a untreated wastewater discharge and runoff from the watershed. In the study, we conducted 4 surveys in April, May, July, and September to understand the current state of water quality for the stream and to make it possibe to predict future water-quality variation for future development. The system runs on a personal computer under the windows enviroment and provides extensive graphic user interface(GUI) for user-friendly assessment. Using the pull-down menus provided by the GUI panel, the user is able to operate the system by pointing and clicking the icon to identify the state of water-quality at locations concerned. Furthermore, we developed an integrated watershed management system. The constructed system could be a useful tool as a decesion maker for pollution source control strategy.

• Journal of Korea Society of Digital Industry and Information Management
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• v.10 no.2
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• pp.143-156
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• 2014

Comprehensive programming channels are based on recognition of the parent company, their parent newspaper has increased brand awareness. In this paper, the comprehensive channels to look at the structure of the channel brand architecture, a certain brand of newspapers and comprehensive channels have a effect on the formation of the image of the channel according to the future of the brand extension strategy for MPP. Referring to the brand architecture, which reveals the structural system of the brand, it is argued that TV Chosun and MBN take the integrated corporate brand strategy, while JTBC tries to mix and balance the brands of the parent corporation and its own independent one. Exceptionally, Channel A doesn't take a name of its parent corporation 'Dong-A'. It is argued that the comprehensive programming channels utilize and take the parent corporate brand, mixed brand, and independent brand in accordance with circumstances of their own parent corporates. Their parent brand of comprehensive channels give viewers a positive image and awareness of comprehensive channel brand. while building its own channel images, TV Chosun and Channel A Conservative extension of a certain brand marketers to be bound by the channel's image. Brand extension of comprehensive channels is to have the strength of their entry into the genre that is most likely higher.

• Korean Journal of Construction Engineering and Management
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• v.5 no.1 s.17
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• pp.107-113
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• 2004

The advent of Radio Frequency Identification (RFID) technology has created new opportunities for improving the material management function in the construction industry and is starting to provide major improvements in the efficiency of the material management process. The objective of the research reported herein was to introduce the benefits of RFID technology on material management in the construction industry. RFID technology is discussed and various aspects of this technology are investigated. Potential RFID applications on material management proposed by Construction Industry Institute (CII) Breakthrough Strategy Committee (BTSC) and Fully Integrated and Automated Technology (FIATECH) are spelled out Finally, business analysis of RFID to estimate its impact is provided. It is concluded that there is a significant potential for improvement of material management function in the construction industry through the use of RFID.

• Journal of Electrical Engineering and Technology
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• v.10 no.4
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• pp.1432-1440
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• 2015

A dynamic economic dispatch and control method is proposed to minimize the overall generating cost for a stand-alone microgrid in DongAo Island, which is integrated with wind turbine generator, solar PV, diesel generator, battery storage, the seawater desalination system and the conventional loads. A new dispatching strategy is presented based on the ranking of component generation costs and two different control modes, in which diesel generator and battery storage alternate to act as the master power source to follow system power fluctuation. The optimal models and GA-based optimization process are given to minimize the overall system generating cost subject to the corresponding constraints and the proposed dispatch strategy. The effectiveness of the proposed method is verified in the stand-alone microgrid in DongAo Island, and the results provide a feasible theoretical and technical basis for optimal energy management and operation control of stand-alone microgrid.

• Korean Institute of Interior Design Journal
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• v.27 no.1
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• pp.12-20
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• 2018

After the "Landscaping Law" was enacted in 2007 Korea, national and local governments has been responding swiftly by seeking various methods. Seoul Metropolitan City and other municipalities have established "Seoul Coloring and Systematization" project, which analyzes and extracts the humanities, humanities and natural environments in 2007 as an opportunity to recognize the importance of environmental color. However, it is necessary to slightly supplement the color scheme created by the observer's concept. In this way, you have to find the color of the environment in a city where real life takes place. The city's environmental color has the concept of "walking" as the basic human behavior. Because the average speed is 4km, it differs from that of a vehicle that travels more than 60km per hour. Also, most of the frontage zone is used except for special cases. Therefore the characteristics of the environmental color and frontage zone on the road side were concluded in this paper as Single Type, Connection Type, and Extension Type. In addition, the principle of environmental color of city was established by the change of texture according to space of time and the characteristics of urban scale, and new media characteristics were found in various interactions. The results of this study suggest an environmental coloring strategy for workability such as hue continuity, hue harmonization and integrated design.

• Journal of Korean Society for Atmospheric Environment
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• v.15 no.5
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• pp.567-574
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• 1999

Volatile organic Compounds(VOC) were measured at an industrial site in Ulsan in 1997 and 1998. Twenty-four hour integrated ambient air samples were collected in 6 L SUMMA canisters during the periods of June 3 to 8, 1997 and June 12 to 17, 1998. The daily mean concentrations of the total $C_2-C_9$ VOC in 1998 were about one third of those in 1997. This decrease of VOC levels may be attributable to the measures to control the emissions of VOC and the decrease of the plant operation. The decrease in the concentrations of oxygenated hydrocarbons and alkenes, especially, contributed to the decrease of the total VOC concentrations in 1998. Lowever concentrations of alkenes compared to aromatics in 1998 were due to the decrease of ethylene and propylene. In the present study, methanol (12.0 ppb) was the most abundant species, followed by acetone (10.1 ppb), propane (6.0 ppb), and vinyl chloride (5.9 ppb). The total concentrations of hazardous air pollutants (HAPs) in 1998 were reduced compared to those in 1997. However, this decrease is due to the drastic decrease of the concentration of methanol. Except methanol, the concentrations of HAPs have not varied much. It is suspected that the VOC control strategy for the Ulsan industrial area has been successful for reducing the total VOC levels but might not be effective in reducing the concentrations of HAPs.

• Journal of Institute of Control, Robotics and Systems
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• v.12 no.2
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• pp.174-185
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• 2006

This paper describes a DR construction for land navigation and the sigma point based receding horizon Kalman FIR (SPRHKF) filter for DR/GPS hybrid navigation system. A simple DR construction is adopted to improve the performance both of the pure DR navigation and the DR/GSP hybrid navigation system. In order to overcome the flaws of the EKF, the SPKF is merged with the receding horizon strategy. This filter has several advantages over the EKF, the SPKF, and the RHKF filter. The advantages include the robustness to the system model uncertainty, the initial estimation error, temporary unknown bias, and etc. The computational burden is reduced. Especially, the proposed filter works well even in the case of exiting the unmodeled random walk of the inertial sensors, which can be occurred in the MEMS inertial sensors by temperature variation. Therefore, the SPRHKF filter can provide the navigation information with good quality in the DR/GPS hybrid navigation system for land navigation seamlessly.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.1
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• pp.267-275
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• 2010

Recently, the implementation & modern policy for Global Navigation Satellite System have actively been performed by USA, RUSSIA, EU & CHINA. Therefore 100+ navigation satellites will be in orbit by 2015, and the user of military and civil will benefit from the use of a total constellation of 100+ satellites. It means that the deepest dependence to GPS would be declined. In the paper, the latest technology development & implementation policy of GNSS have been analyzed. Specially, we focused on circumstance change of GNSS & application of navigation technology for modem weapon system. Finally, the application strategy of the integrated GNSS is suggested for military and civil as well.

• Journal of the Korean Geographical Society
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• v.49 no.3
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• pp.357-370
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• 2014

This paper aims at analyzing the use of REITs for developing student housing. To do this, firstly, the case studies of student housing REITs in U.S. are analyzed, and secondly, possibility and schemes of using REITs in Korea for the expansion of student housing. REITs are actively participated in the investment and management of student housing in U.S. and they are vertically integrated real estate investment operating companies which play a role of design-development-investment-managementconsulting. Student housing REITs can be fully used in Korea. To do this, special strategy integrating investment and management strategy should be examined. In these context, joint-venture model and PPP-conbined model are suggested to use REITs effectively.