• Journal of the Korean Solar Energy Society
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• v.35 no.5
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• pp.49-56
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• 2015

In this study a hybrid heating system based on geothermal source and solar heat was developed in order to save energy for greenhouse heating and its field performance was evaluated. Developed system are composed of following parts: water tank, heat exchanger, heat pump, fan coil unit and heat storage unit. The working performance test was carried out in a greenhouse cultivating oriental orchids being managed by $23^{\circ}C$. Field performance test results showed that average heating coefficient of performance ($COP_h$) was 3.4 for the period from mid-January to mid-March 2013. Heating coefficient of performance ($COP_h$) of developed hybrid heat pump system was more sensitive to water tank temperature than outside air temperature. This study showed that developed hybrid heat pump system has a potential to save the heating costs up to 91% compared to conventional agricultural oil heaters.

• Journal of Auto-vehicle Safety Association
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• v.11 no.1
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• pp.23-29
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• 2019

Recently, use of composite materials has been increasing for body structures and chassis parts in the car industry because of weight reduction effect and excellent mechanical thermal characteristics. However, application of composite materials in brake system is very difficult because it is hard to obtain enough brake performance due to low heat storage capacity of the composite materials. In this paper, we will present new carbon ceramic composite disc with high flow characteristic. To obtain this characteristic, new vent structures were designed by using ARIZ method and substance-field model analysis. The flow effect of these vent structures on the brake performance was verified by pugh matrix and cooling test. The test results show improvement of cooling performance up to $30^{\circ}C$. Finally, These results will improve brake the reliability of the brake performance for the high performance vehicles and electric vehicles.

• Journal of the Korea Society of Computer and Information
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• v.26 no.9
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• pp.37-47
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• 2021

In this paper, we propose a new deep learning model for tongue segmentation with improved accuracy compared to the existing model by diversifying the receptive field in the U-net. Methods such as parallel convolution, dilated convolution, and constant channel increase were used to diversify the receptive field. For the proposed deep learning model, a tongue region segmentation experiment was performed on two test datasets. The training image and the test image are similar in TestSet1 and they are not in TestSet2. Experimental results show that segmentation performance improved as the receptive field was diversified. The mIoU value of the proposed method was 98.14% for TestSet1 and 91.90% for TestSet2 which was higher than the result of existing models such as U-net, DeepTongue, and TongueNet.

• Proceedings of the KSR Conference
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• 2003.10b
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• pp.141-145
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• 2003

Step-by-step laboratory performance test and repetitive improvement of KRRI rail fastening system show that it has the similar capability as other fastening systems that have been globally used. In this study, for the evaluation of field applicability, construction and rolling-stock operation test of KRRI rail fastening system are performed. Through this approach, comparison against the service criteria of foreign countries are made.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.146-146
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• 2000

This paper presents field test results of the GPS precise positioning using carrier phase observable. The Least-squares AMBiguity Decorrelation Adjustment(LAMBDA) method is implemented to resolve integer ambiguity problem for two epoch Ll carrier phase measurement data. Field test results show that the GPS precise positioning of cm-level accuracy is obtainable with conventional low cost, single frequency C/A code GPS receivers.

• 한국터널공학회:학술대회논문집
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• 2005.04a
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• pp.131-141
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• 2005

Korea shotcrete technology has been developed by constructing underground space, roads and rails for expanding Social Overhead Capital. To late, importance of shotcrete is raised due to the efforts for semi-permanent use of underground structure and a long term safety. Shotcrete testing method and quality criterion have been developed continusously in abroad, but there are no standard and quality criterion of shotcrete in Korea. International quality criterion has been used to domestic conditions, so various problems are occurred in construction field, material, mixture, equipment, and so on. In this study, to establish standard of domestic shotcrete, both criteria and quality of shotcrete were investigated and opinion poll was performed in the construction field. Indoor and field test were performed to investigate appliance possibility of high-performance shotcrete.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.12
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• pp.3069-3078
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• 2014

This research handles the performance improvement effect by the Modeling & Simulation and shows the design, implementation, test results of the new 3-axis magnetometer which is the core component of strategic offensive deploying mine. The submarine is modelled by using the commercial electromagnetic field analysis tool on numerical value, and its magnetic field characteristic is predicted in order to apply the new magnetometer to the future underwater weapon system. The method to take the performance test results of new 3-axis magnetometer in the land is shown instead of the real test result in sea by making the miniature submarine.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.581-585
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• 2005

For the Korean high speed railway rolling stock, which is developed through the G7 research project, various tests such as components test, prototype train test, on-line test have been carried out for years. In order to obtain the system stability, mutual interface between each part (rolling stock, track, bridge, electricity and signal) should be verified. For this reason, track performance according to the speed increase of HSR has been monitored in field. Especially, through the analyses of accumulated data, structural and running stability of HSR has been evaluated. With this viewpoint, this paper presents the track performance test method and the test results corresponding to 350km/h speed increase of HSR.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.15-18
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• 2004

In this paper, it is implemented the monitoring system for TV advertisement using video watermark. The functions of an advertisement monitoring system are automatically monitoring for the time, length, and index of the on-air advertisement, saving the log data, and reporting the monitoring result. The performance of the video watermark used in this paper is tested for TV advertisement monitoring. This test includes LAB test and field test. LAB test is done in laboratory environment and field test in actually broadcasting environment. LAB test includes PSNR, distortion measure in image, and the watermark detection rate in the various attack environment such as AD/DA(analog to digital and digital to analog) conversion, noise addition, and MPEG compression The result of LAB test is good for the TV advertisement monitoring. KOBACO and SBS are participated in the field test. The watermark detection rate is 100% in both the real-time processing and the saved file processing. The average deviation of the watermark detection time is 0.2 second, which is good because the permissible average error is 0.5 second.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.1
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• pp.206-213
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• 2007

In this paper, The monitoring system for TV advertisement is implemented using video watermark. The functions of the advertisement monitoring system are monitoring the time, length, and index of the on-air advertisement, saving the log data, and reporting the monitoring result. The performance of the video watermark used in this paper is tested for TV advertisement monitoring. This test includes LAB test and field test. LAB test is done in laboratory environment and field test in actually broadcasting environment. LAB test includes PSNR, distortion measure in image, and the watermark detection rate in the various attack environment such as AD/DA(analog to digital and digital to analog) conversion, noise addition, and MPEG compression. The result of LAB test is good for the TV advertisement monitoring. KOBACO and SBS are participated in the field test. The watermark detection rate is 100% in both the real-time processing and the saved the processing. The average deviation of the watermark detection time is 0.2 second, which is good because the permissible average error is 0.5 second.