• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.1
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• pp.1-8
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• 2016

In this study, an WiFi fingerprinting method based on the k-nn algorithm was applied to improve the accuracy of location tracking of a moving train on a platform and evaluate the performance to minimize the estimation error of location tracking. The data related to the position of the moving train are monitored by the control center for trains and used widely for the safety and comfort of passengers. The train location tracking methods based on WiFi installed by telecom companies were evaluated. In this study, a simulator was developed to consider the environments of two cases; in already installed WiFi devices and new installed WiFi devices. The developed simulator can simulate the localized estimation of the position under a variety of conditions, such as the number of WiFi devices, the area of platform and entry velocity of train. To apply location tracking algorithms, a k-nn algorithm and fuzzy k-nn algorithm were applied selectively according to the underlying condition and also four distance measurement algorithms were applied to compare the error of location tracking. In conclusion, the best method to estimate train location tracking is a combination of the k-nn algorithm and Minkoski distance measurement at a 0.5m grid unit and 8 WiFi AP installed.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.3
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• pp.553-558
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• 2019

Global auto parts companies are making efforts to develop EWP(: Electric Water Pump) which is one of the core parts of environment friendly car. In eco-friendly automobiles, an independent cooling system is used rather than a cooling system that is linked to an internal combustion engine. Therefore, the research and development of the water pump operating separately from the engine and the related production system are being actively carried out. In order to overcome the shortcoming of EWP of PPS material suitable for injection system, G company which is a global parts company that researches and develops EWP around SUS and is in the process of developing robot-based production equipment for mass production. In this paper, a heat shock simulation system is designed and implemented that works with the robot-based production system to test the performance of the produced EWP. By using this system, it is possible to test the EWP in an virtual environment similar to the actual environment, thereby reducing the defect rate of the product. At the same time, all the data produced during the entire process for testing can be stored, which can be utilized in the future development of CPS(: Cyber Physical System) of EWP system based on big data.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.6
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• pp.1013-1024
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• 2022

In addition to the assessment measure of electric quality levels, load loss are also a factor in hindering the financial profits of electrical sales companies. Therefore, accurate analysis of load losses generated from distributed power networks is very important. The accurate calculation of load losses in the distribution line has been carried out for a long time in many research institutes as well as power utilities around the world. But it is increasingly difficult to calculate the exact amount of loss due to the increase in the congestion of distribution power network due to the linkage of distributed energy resources(DER). In this paper, we develop smart grid big data infrastructure in order to accurately analyze the load loss of the distribution power network due to the connection of DERs. Through the preprocess of data selected from the smart grid big data, we develop a load loss analysis model that eliminated 'veracity' which is one of the characteristics of smart grid big data. Our analysis results can be used for facility investment plans or network operation plans to maintain stable supply reliability and power quality.

• 한국ITS학회:학술대회논문집
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• 2008.11a
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• pp.519-524
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• 2008

In this paper, we mainly describe the development of exclusive u-device essentially required to implement new ITS services (taxi call service, service for transportation vulnerable, transport information service, walker's navigator, electronic payment service, call information service etc.). To design this device, Samsung main CPU S3C2440A was selected and large memories (ROM and RAM) which are required for new ITS services are applied. In addition, all of GPS, RFID module, Wi-Fi and Bluetooth functions are included to develop an exclusive device indispensable in the ubiquitous society. For this, in this paper, we first examined detailed design of an exclusive u-device development, and based on the designed contents, the performance of a realized u-device was evaluated. If services are created by linking new ITS services with relevant public institutions or companies, based on application of the exclusive u-device developed as above, they would be expanded to a new blue ocean, expectedly resulting in a big spillover effect in local societies.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.1
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• pp.1-6
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• 2006

Previous to do business computerization of industry field, it isn't efficient for write down all account book. Recently many companies competitive is raised from competence improvement for a task and cost-cutting for electronic data processing system. Moreover, sudden increase of internet-user need effective management information system and share information because of network connection. Accordingly, it needs to get out of text base information system from multimedia base system and it need to introduce E-catalog system of merchandise information. In addition, it is required technological development and merchandising with movement, real time omnipresent. carrying. In this paper, established portable B2B system with movement of precious metals and jewels field's portable terminal from mobile technology.

• Journal of KIISE:Software and Applications
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• v.26 no.8
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• pp.946-954
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• 1999

웹의 등장으로 전자 업무 처리는 급격한 성장을 보여왔다. 많은 업계에서는 업무 처리에 있어 핵심이 되는 트랜잭션을 웹에서 처리하기 위한 시스템 개발에 많은 노력을 기울여왔다. 그러나 대부분의 웹 트랜잭션 연구는 주로 CGI 방식의 트랜잭션 처리 성능의 한계를 극복하거나, 여러 HTTP 요청간의 상태 유지 방법 또는 시스템의 확장성 등에 대해 연구가 집중된 반면, 부적합한 웹 환경으로 유발되는 시스템의 일관성 손실에 대해서는 많은 관심을 받지 못했다.본 논문에서는 웹 상에서 신뢰성 있는 트랜잭션을 처리하는 경우 발생되는 세 가지 문제점을 지적하고, 이를 막기 위해 웹 트랜잭션 처리 시스템인 WebTP에서 제공하는 해결책을 제안한다. 제안한 해결책은 쿠키 로깅, 웹 페이지 로깅, 그리고 일방적으로 철회된 트랜잭션의 상태를 유지하는 기법을 근간으로 한다. 또한 제안된 방법은 유사 구조의 타 웹 트랜잭션 처리 시스템에서도 적용 가능하다.Abstract Electronic business processing has drastically grown since the advent of the World Wide Web. As transaction processing is at heart of business processing, many companies have been interested in transaction processing on the Web. However, little attention has been paid to supporting consistent transaction processing on the Web, while most of the work has been focused on performance enhancement, processing multiple HTTP requests in a single context, and scalability.This paper identifies three problems in consistent transaction processing on the Web, and proposes corresponding solutions for each problem. The results are implemented in the Web transaction processing system WebTP. These solutions are based on cookie logging, Web page logging and keeping information for unilaterally aborted transactions. The solutions proposed in this paper also can be applied to other Web transaction processing system of similar architecture.

• Clean Technology
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• v.8 no.4
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• pp.173-180
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• 2002

As a primary material for MLCC, $BaTiO_3$ particles coated with two additives in a core-shell structure were prepared in this study. This composite powder can not only reduce the VOC emission during MLCC manufacture but also increase the density and reliability of electronic products. The additives were $Y_2O_3$ and $MnCO_3$, whose composition information was obtained from domestic companies. It was observed that the surface of $BaTiO_3$ particles was uniformly as well as simultaneously coated by those two materials via urea-decomposition reaction over $70^{\circ}C$ as the reaction temperature. Elemental analysis indicated that the measured content of each additve was quite close to the designated value. The effect of polymeric dispersant such as PVP, on the coating characteristics was not as significant as expected.

• Journal of the Society of Disaster Information
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• v.8 no.1
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• pp.93-99
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• 2012

This study is to present false alarm management of alarm monitoring service, by literature analysis and interview with the persons in charge of service of alarm monitoring service companies. To reduce false alarm by customer's mistake, development of educational tool that could provide practical effect is needed. Also institutional consent to charge a specific sum of money could be considered for unnecessary dispatch that occurred by customer's mistake. To improve the false alarm by defect of equipments and installation of electronic security system, standardization of technical regulation and system installation is necessary. And to improve the performance of passive infrared sensor that cause most false alarm, the development of new type of sensor is required. It could be considered that guideline on educational contents and term definition about false alarm could be come under the security regulation.

• Journal of Digital Convergence
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• v.11 no.5
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• pp.63-72
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• 2013

Cloud services is recognized the essential IT infrastructure in the optimal smart society which is changing rapidly as a low-cost and high-efficiency. This service of starting from prominent overseas companies such as Google, Amazon, had influenced on the introduction of the service for the various policies of foreign governments, including the United States and the United Kingdom. Such countries adopt to the cloud computing and make transform to the cloud service of existing public service for the effective management of information resources. In this study, we propose a model for adoption of appropriate cloud-based public services in Korea through analyzing the foreign government case of adoption of cloud services.

• Journal of Arbitration Studies
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• v.24 no.4
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• pp.29-47
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• 2014

In recent years, with the rapid development of electronic commerce, companies engaging in e-commerce want to take advantage of fast and easy way to solve ever-growing disputes online. South Korea's e-commerce disputes are mainly solved by mediation process of Korea E-commerce Mediation Committee. The whole process of online mediation can be carried out by the network, with the advantages of high efficiency and speed. On the other hand, the introduction of CIETAC's online Arbitration Rules in China meets the actual needs. Especially the requirement of hearing trials' procedures should be easier and faster, making the dispute can be resolved in a short time. Furthermore, the whole process from applying to ruling is conducted online, which meets the needs of e-commerce business that want to solve the disputes faster and more efficient. In addition, the cost of online arbitration is much lower than the average arbitrations. The implementation of the CIETAC's Online Arbitration Rules, will further promote the development of e-commerce in China. With the increase of trade volume between China and Korea, the e-business are also increasing. Although South Korea has not yet implemented online arbitration until now, CIETAC's effort for combining arbitration and mediation have good implications for development Korea's e-commerce online dispute system to promote e-Commerce between Korea and China.