• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.264-268
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• 2007

This article presents the performance evaluation case study of circuit-switched WCDMA R5MSC(Mobile Switching Center) Server and CS-MGW(Circuit Switched Media Gateway) in 3'rd generation mobile telecommunication (UMTS : Universal Mobile Telecommunication System). The presented work adopted circuit switching scenarios recommended by 3GPP(Third Generation Partnership Project) and terrestrial spectrum calculation parameters and its values defined in ITU-R M.2023 and M.1390 to do the case study on performance evaluation of circuit switched system (R5 MSC Server and CS-MGW) in WCDMA core network. This paper describes test results by using simulator which substitutes for wireless section (MS, Node-B, RNC).

• IEMEK Journal of Embedded Systems and Applications
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• v.11 no.6
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• pp.369-377
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• 2016

Recently, many changes have been made to people's life patterns as the technological advances in the ICT industry. The fusion of smart phones and various IT technologies has brought people convenience and welfare. A typical example of such fusion is the smart home. However, the existing smart home systems are difficult to be changed or extended. So we design a new smart home system with extensibility that can easily adopt legacy appliances and be scaled up. Among a variety of smart home features, this paper deals with IoT Devices that are responsible for controlling power or transmitting and receiving sensing values, IoT Gateway that connects users and consumer electronics via Internet, and Smart Home Manager that monitors and controls these components in the proposed smart home system.

• Journal of Korea Multimedia Society
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• v.17 no.11
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• pp.1279-1285
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• 2014

In this paper, we propose on image encryption method which uses NC(Non-linear Cycle) and 2D CAT(Two-Dimensional Cellular Automata Transform) in sequence to encrypt medical images. In terms of the methodology, we use NC to generate a pseudo noise sequence equal to the size of the original image. We then conduct an XOR operation of the generated sequence with the original image to conduct level 1 NC encryption. Then we set the proper Gateway Values to generate the 2D CAT basis functions. We multiply the generated basis functions by the altered NC encryption image to conduct the 2nd level 2D CAT encryption. Finally, we verify that the proposed method is efficient and extremely safe by conducting an analysis of the key spatial and sensitivity analysis of pixels.

• Geomechanics and Engineering
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• v.21 no.1
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• pp.23-33
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• 2020

An advancing cutting roof for gob-side entry retaining with no-pillar mining under specific geological conditions is more conducive to the safe and efficient production in a coalmine. This method is being promoted for use in a large number of coalmines because it has many advantages compared to the retaining method with an artificial filling wall as the gateway side filling body. In order to observe the inner structure of the gateway cutting roof and understand its stability mechanism, an equivalent material simulation experiment for a coalmine with complex geological conditions was carried out in this study. The results show that a "self-stabilization bearing structure" equilibrium model was found after the cutting roof caving when the cut line deviation angle was unequal to zero and the cut height was greater than the mining height, and the caving roof rock was hard without damage. The model showed that its stability was mainly controlled by two key blocks. Furthermore, in order to determine the optimal parameters of the cut height and the cut line deviation angle for the cutting roof of the retaining gateway, an in-depth analysis with theoretical mechanics and mine rock mechanics of the model was performed, and the relationship between the roof balance control force and the cut height and cut line deviation angle was solved. It was found that the selection of the values of the cut height and the cut line deviation angle had to conform to a certain principle that it should not only utilize the support force provided by the coal wall and the contact surface of the two key blocks but also prevent the failure of the coal wall and the contact surface.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.782-787
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• 2004

Internet Engineering Task Force (IETF) has been considering the deployment of the Random Early Detection (RED) in order to avoid the increasing of packet loss rates which caused by an exponential increase in network traffic and buffer overflow. Although RED mechanism can prevent buffer overflow and hence reduce an average values of packet loss rates, but this technique is ineffective in preventing the consecutive drop in the high traffic condition. Moreover, it increases a probability and average number of consecutive dropped packet in the low traffic condition (named as "uncritical condition"). RED mechanism effects to TCP congestion control that build up the consecutive of the unnecessary transmission rate reducing; lead to low utilization on the link and consequently degrade the network performance. To overcome these problems, we have proposed a new mechanism, named as Extended Drop slope RED (ExRED) mechanism, by modifying the traditional RED. The numerical and simulation results show that our proposed mechanism reduces a drop probability in the uncritical condition.

• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.855-858
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• 2008

It can be said that indicator of national competitiveness in 21C knowledge-based society is a ability to create various values of knowledge. Investment of R&D in Korea is located at very high position in the world, and RAND Corporation classified Korea as a industrialized country in science & technology fields because of having potentiality to future technology with major industrialized countries. But globalization status of science and technology is badly lower position among OECD nations. To disseminate Korea's scientific and technical information in the world, this paper's purpose is to examine efforts of non-english speaking countries. And it introduces KoreaScience, gateway to scientific and technical information in korea.

• Journal of the Korean Society for Library and Information Science
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• v.43 no.3
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• pp.197-219
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• 2009

The study acknowledges the need for classification systems in arts and cultural education. The study constructs a faceted classification system for this domain based on systematic methods. The study utilized iterative collaboration between domain experts and classification system developers. The classification system consists of 13 main facets and terms. The classification system has values to manage information resources effectively and efficiently. It is also beneficial for reducing cultural gaps in arts and cultural education as well as providing an information gateway for users.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.285-289
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• 2016

In recent domestic new growth model based on the IoT it has been proposed by the industry and national authorities. As applied to these Internet-based IoT convergence center of the field is expected to be realized, including the improvement and increase of efficiency of various economic values. In this paper, using KETI ( Korea Electronics Technology Institute ) developed distribution being oneM2M standards-based platform from Mobius and Gateway Platforms & Cube, and low power, capable of long-range RF communication LoRa communication module is proposed to build the site applicable environment.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.35 no.2
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• pp.155-159
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• 2022

Smart livestock, which combines information and communication technology (ICT) with livestock, can be said to be an effective solution to existing livestock problems such as productivity improvement, odors, and diseases. So far, it has hardly been universalized; thus, it is necessary to develop automation devices to reduce labor by localizing automation devices to expand the distribution of ICT technology to farms, and to advance precise specifications and health management technology using biometric information. Weighing scales currently being used in livestock farms are to prevent the spread of diseases by diagnosis and preparation for AI and other diseases in advance, using information on the growing weight of duck breeding. However, accurate values cannot be obtained due to poor breeding conditions. In this paper, we developed a separate data transmission system kit for the weighing scale and placed the sensor on top of the weighing scale so that the sensor wire is not affected by pollutants or ducks on the floor. A display function was provided, and a method of receiving and analyzing the serial port data of the weighing device, and then transmitting them to the data collection server was implemented.

• Korean Journal of Digital Imaging in Medicine
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• v.12 no.2
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• pp.81-87
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• 2010

The setting parameters of ultrasound scanner give influences to change of image. Sonographers have used a Matlab program to make Low Contrast Sensitivity(LCS) value and compared original images in order to evaluate the use of the supersonic diagnosis machinery. We confirmed the change of image in Grayscale values using Photoshop program. Experiment equipment of our research used A Medison Accuvix V10, A Multi-Tissue Ultrasound Phantom(040 GSE) of CHRIS Company, A Adobe Photoshop CS4 Program, A Convex Probe, A USB memory stick, A Probe Fixation Equipment. The method used Gain, Dynamic Range(DR) of the setting parameters of ultrasound scanner and researched Gain and DR was set to 10 dB. We changed the different settings to see the changes of images using Grayscale values of a Photoshop program about tissue images of a phantom. This study evaluated DR and Gain whether it is an image controller to get the optimum contrast to produce an image to see the how effect on the images. We did not use Gateway in supersonic diagnosis machinery. We can easily open to open the files through Photoshop program before we get Digital Imaging and Communications in Medicine(DICOM) files use USB memory stick in supersonic diagnosis machinery. When we diagnosed the lesion of the patient with ultrasound, the contrast and the Gray scale value of image are very important. In this research, we determined the optimum setting parameters that provided useful information to diagnose disease and evaluated the change of improved images.