• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.1
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• pp.215-224
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• 2013

This paper proposes a robust lane detection algorithm for bumpy or slope changing roads by estimating extrinsic camera parameters, which represent the pose of the camera mounted on the car. The proposed algorithm assumes that two lanes are parallel with the predefined width. The lane detection and the extrinsic camera parameter estimation are performed simultaneously by utilizing B-snake in motion compensated and merged feature map with consecutive sequences. The experimental results show the robustness of the proposed algorithm in various road environments. Furthermore, the accuracy of extrinsic camera parameter estimation is evaluated by calculating the distance to a preceding car with the estimated parameters and comparing to the radar-measured distance.

• Proceedings of the KIEE Conference
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• 1999.07b
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• pp.516-518
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• 1999

This paper presents an feed-forward neural network design instead PI controller for the speed control of an Induction Motor. The design employs the training strategy with Neural Network Controller(NNC) and Neural Network Emulator(NNE). Emulator identifies the motor by simulating the input and output map. In order to update the weights of the Controller. Emulator supplies the error path to the output stage of the controller using backpropagation algorithm. and then Controller produces an adequate output to the system due to neural networks learning capability. Therefore it becomes adjustable to the system with changing characteristics caused by a load. The speed control based on neural networks for induction motor is implemented by a vector controlled induction motor. The simulation results demonstrate that actual motor speed with neural network system well follows the reference speed minimizing the error and is available to implement on the vector control theory.

• Transactions of the Korean Society of Mechanical Engineers
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• v.12 no.4
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• pp.833-846
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• 1988

Two-phase flow heat transfer phenomena with flash evaporation inside a vertical tube were studied experimentally. Void fractions were measured using electrical probes, and the flow patterns were identified from the output voltage signal itself. The flow pattern as well as the beat transfer rates were changing along the axial distance from the tube inlet with the system pressure. As the pressure inside the tube decreases with fixed inlet temperature, the overall heat transfer coefficient through the tube wall and the boiling heat transfer coefficient inside the tube increase whereas the condensation heat transfer coefficient outside the tube decreases. The boiling heat transfer coefficient inside the tube measured by the experiments appeared to be somewhat larger than the value obtained from the Chen's correlation. Also, the flow patterns identified from present experiments are at the larger quality region of the low pattern map based on the transition criteria of Mishima and Ishii. This may be due to the non-equilibrium flashing phenomenon occurred at the nozzle exit and the tube inlet ; this also implies that the flow pattern of the two-phase flow depends strongly on the inlet conditions.

• Journal of the Korean Society for Precision Engineering
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• v.26 no.1
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• pp.97-104
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• 2009

There is a many kinds with nondestructive testing such as RT and UT representatively. Referred before two testing methods there is a limit which is spatial such as nuclear pipe, small vessel, sealing up vessel. So a new technique needs to overcome the limit which is spatial. shearography will be able to overcome the limit which is spatial. This paper introducing shearography which was known as non-contact full-field testing method and It is an interferometric technique for measurement of surface deformation such as displacement or displacement gradient. Also, a research about internal defect of the flange welding zone was accomplished. About variation with method pressurized with the Gaseous Nitrogen. Phase map where is various were measured according to changing a sheared direction, size of crack and loaded pressure. Consequently, crack quantitatively to be detected qualitatively was measured by using shearography.

• Journal of architectural history
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• v.26 no.6
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• pp.29-40
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• 2017

Soswaewon as a typical villa garden of Korea is a symbolic garden that its diverse compositions imply a specific meaning. This study reviewed the purpose of introduction, meaning, and location of the landscape plants as one of the compositions and covering quite a large part of Soswaewon through 48 Yeong (meaning 48 poems of Soswaewon) and Soswaewondo (meaning Map of Soswaewon). In 48 Yeong, 27 verses describe landscape plants as their key poetic matters. The most frequently mentioned top 3 plants are bamboos, pine trees, and Japanese apricots. The three plants are called Sehansamwoo(歲寒三友) showing constant fidelity and loyalty in any changing situations, which was regarded to represent the nature of scholars. And also the study examined the frequency and planting location of the plants in Soswaewon by comparing 48 Yeong and Soswaewondo, and the result showed some differences between them. That seems to be caused by the limitations in the comparison, because in case of 48 Yeong, the location and frequency of landscape plants can be examined only through the context of the verses, and Soswaewondo showed different production time from 48 Yeong and expressed them only in a form of drawing. The plants have symbolic meanings multi-layered and ambiguous. With their symbolic meanings, the landscape plants reviewed through 48 Yeong consistently represent fidelity and loyalty, man of virtue, and hermit. That is, Soswaewon is the garden granting some significance to its compositions by interacting with the things.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2003.11a
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• pp.295-299
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• 2003

The development of rapid science technology and data communication technology in 1990 was infiltrated into our real lives deeply and drew forth various changes in various sides. According to that with the new definition of the character of space the users' patterns in the space were changed. We come to have a turning point of change with the introduction of personal computer and digital revolution late in the 20th century. Accordingly, this study is to analyze the connected structure of the space on a basis of the apartment model house since 2000 in order to investigate the aspect of changing the space according to the era of informationization. This analysis of space structure makes the characteristics in the era of informationization objectified. And it will understand the distinct change of space by grasping the relations with the connection of space, and predict the direction that the dwelling space heads for the future.

• Environmental Engineering Research
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• v.20 no.2
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• pp.155-161
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• 2015

Experimental research shows that the nitric oxides ($NO_X$) concentration track at the outlet of selective catalytic reduction (SCR) catalyst with a transient variation of Adblue dosage has a time delay and it features a characteristic of resistance-capacitance (RC). The phenomenon brings obstacles to get the simultaneously $NO_X$ expected to be reduced and equi-molar ammonia available to SCR reaction, which finally inhibits $NO_X$ conversion efficiency. Generally, engine loads change frequently, which triggers a rapid changing of Adblue dosage, and it aggravates the air quality that are caused by $NO_X$ emission and ammonia slip. In order to increase the conversion efficiency of $NO_X$ and avoid secondary pollution, the paper gives a comprehensive analysis of the SCR system and tells readers the key factors that affect time delay and RC characteristics. Accordingly, a map of time delay is established and a solution method for time constant and proportional constant is carried out. Finally, the paper accurately describes the input-output state relation of SCR system by using "variable RC model with time delay". The model can be used for a real-time correction of Adblue dosage, which can increase the conversion efficiency of $NO_X$ in SCR system and avoid secondary pollution forming. Obviously, the results of the work discover an avenue for the SCR control strategy.

• Journal of Technology Innovation
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• v.19 no.2
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• pp.77-97
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• 2011

Information technologies are changing rapidly in recent years because of the latest IT development and technology convergence. Therefore, government tries to choose technologies required to achieve mid and long-term strategic technical development target and present technology road map. We established national defense scientific technology plan process for weapon systems. However, national defense IT plan process has not been established yet. Accordingly, in this paper, we suggested outlook of future national defense informationization through national defense Information Technology environment analysis, and discovered future potential Information Technology for national defense through methodology of investigation and analysis and suggested Defense IT Planning development.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2010.04a
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• pp.389-393
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• 2010

The Objective of this study was to develop a system for visualizing inundation area by using 1-D numerical model analyzing damage information such as inundation area, facilities, land usages, population, building, loads. In this study, we have reviewed hydraulic models to select a flood model for simulation of discharges, water depths and velocities. The study area is Namhan River from Youngwol to Paldang Dam which had a flood damage on upper and below regions of Chungju Dam by a storm event in 2006. At the first, we developed the DB system base on GIS thematic map, ortho images, cadastral maps to analyze flood damages and support decisions making. Changing the boundary conditions such as discharge at the gauging stations, flood simulations were performed and then damages were extracted from the databases information support system based on 1-D numerical hydraulic model, it is expected to be able to analyze flood damages and support a decision making for reduce flood relate damages. In the future, the system developed in this study could be applied for flood forecasting system of small scaled streams.

• Journal of Digital Convergence
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• v.11 no.1
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• pp.165-172
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• 2013

Website creations and their renewal process are very difficult due to ever-changing mobile environments such as various operating systems and mobile devices. In this regard, HTML5 serves as the solution and guideline to developing well-functioning websites. Mobile websites using HTML5 can provide consistent contents and services even though users access them through various OS or device types. This paper examines a possibility of the HTML5-based website for a local private college located in Busan. For this, location-based map service and semantic auto dialing webform service have been implemented. After making the website available, students and staff members were satisfied with the improvement in the speed of loading time and error free contents service. In the future, the rest of HTML5 functionalities are planned to be implemented sequentially.