• Journal of Korea Multimedia Society
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• v.20 no.3
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• pp.511-519
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• 2017

This Paper introduces the design and communication method between PLC (Programmable Logic Controller) and Arduino based on MODBUS Protocol. MODBUS connection can be established in a new or existing system very easily, therefore we used this protocol in our proposed system. In the field of automatic devices, multi-function serial port such as RS232, RS422, RS485, and so on creates a great convenience to the developer. This proposed system used RS485 as a key mediator for data exchanging on a connected network. We also believe that it will reduce the development cost in various automated industry because this system can be reused or can be implemented any such PLC installed machines. RS485 is used as a communication interface between PLC (as a slave) and Arduino (as a master), through which a reliable network is created for safe and fast communication. Furthermore, RS485 allows multiple devices(up to 32) to communicate at half duplex on a single pair of wires and provides a long connectivity area (up to 1200 meters) as compare to other device, which makes it a user-friendly for various devices in the automated industry. Moreover, Arduino can play as a mediator by connecting third party device and setup a communication network with PLC.

• Journal of KIISE:Computer Systems and Theory
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• v.37 no.6
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• pp.339-347
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• 2010

Inter-process communication (IPC), which is a technique that enables exchanging data among multiple processes, is commonly used not only in user applications but also in system processes. For this reason, the performance of IPC highly influences the performance of whole computer system. Especially, heavy overload on a single server process caused by IPC requests from multiple client processes, easily results overall slowdown of IPC response time. Here, to deal with the problem stated above, the time-slice donation technique which is adapted in L4 microkernel is analyzed and enhanced for reducing latency of IPC response time and implemented on linux kernel for actual performance evaluation. While trying to maintain the additional overhead as least as possible, the experiment shows that the use of this technique enhances the performance of IPC multiple times of existing technique under certain circumstances.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.4
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• pp.849-861
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• 2015

As the rise in popularity of online games, the users start exchanging rare items for real money. As RMT (Real Money Trade) is prevalent, GFG (Gold Farming Group) who abuse RMT shows up. GFG causes social problems such as identity theft, privacy leaks. Because they needs many bot characters to gather game items. In addition, GFG induce RMT that makes in-game problems such as a destroying game economy, account hacking. Therefore, It is very important work to collapse GFG at the perspective of social and in-game. In this paper, we proposed a fundamental method for detecting RMT buyers for the collapse of GFG at the perspective of buyer by Law of Demand and Supply. We found two type of RMT by analyzing actual game data and detected RMT buyers with high recall ratio of 98% by ruled-based detection.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.8
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• pp.1443-1448
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• 2006

As computers and networks become popular, distributing information on the Internet is common in our daily life. In the past, e-mail has been the primary choice of exchanging information but messengers are gaining popularity abroad and domestically because of their nature of getting immediate responses. Information leakage by invasion that is enemy of evil in communication of communications division Server and Agent between each agents that become burden of communication for effective administration of data for most of existing messenger is becoming an issue. In this paper, we design a secure messenger system that could be obtained maximum security. It use ECC based on ElGamal methodology using PKI for secure communication. For the message encryption and decryption between the same group non, each group is kept distinct by drawing an elliptic curve and an arbitrary point is chosen on the curve.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.5
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• pp.979-985
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• 2016

In this paper, a distributed instant message system with multiple servers architecture which can distribute system load effectively using an extended media control channel has been presented. A media control channel provides establishing a reliable control channel and also keeping a reliable control channel between SIP server and client in the field of real-time media transport area. In this study, a new instant message system architecture which can distribute massive instant message including multimedia data to multiple servers has been presented. The presented instant message system architecture can distribute system load by extending media control channel. For this purpose, media control channel messages, which distribute system load to multiple servers dynamically according to increasing number of users, have been designed in our presented system. And, in our research, an exchanging procedures of media control channel messages between servers have also been presented. The performance of the proposed system has been analysed by simulation.

• Fashion & Textile Research Journal
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• v.19 no.5
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• pp.559-568
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• 2017

The purpose of this study was to identify the socio-psychological variables and demographic factors influencing the difficulty people may have in discarding fashion goods. In addition, differences of disposal behavior were investigated according to the degree of reported difficulty with which people discarded fashion goods. A total of 260 survey questionnaires were analyzed. Frequency, correlation, exploratory factor analysis, reliability, t-test and multiple regression analyses were used for data analysis using SPSS 22.0. The study results were as follows. First, the difficulty of discarding of fashion goods was positively affected by concern for the environment and the potential for creative reuse of fashion goods, whereas it was not influenced by interdependence. Second, there were differences in the difficulty with which people discarded fashion goods according to demographic factors such as gender and whether or not they held certain religious beliefs; however, there were no differences among other demographic factors. Third, the group demonstrating a high degree of difficulty in discarding fashion goods preferred certain disposal behaviors such as donating to religious organizations, schools, charities etc., exchanging with other people or bartering, reforming for other purposes, selling to secondhand shops or on the internet, storing without wearing it, or discarding it after salvaging reusable parts. The results of this study provide various guidelines for consumers and retailers of fashion products who are interested in the efficient disposal of fashion goods.

• Journal of the Korean Society for information Management
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• v.27 no.1
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• pp.79-102
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• 2010

In Korea, more than half of medical libraries are small.sized hospital libraries operated under the single.librarian system, and it is keenly required to establish collection management policies for exchanging resources with other libraries and maintaining consistency. however, it is rare to set up their collection management policies on the web among the domestic medical libraries. Thus, this study purposed to survey cases of collection management policies in domestic and foreign medical libraries and to provide basic information and ideas for Korean medical libraries that are preparing collection management policies. As long as core requirements are satisfied, collection management policies do not have a way. Thus, this case study is expected to provide useful ideas to medical libraries developing their collection management policies. For this purpose, we selected 12 survey items based on previous studies, and investigated one domestic and five foreign medical libraries, and analyzed collected data. Based on the results of analyzing the cases, we suggested 12 guidelines.

• Journal of Bio-Environment Control
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• v.9 no.4
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• pp.212-222
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• 2000

This study was performed to investigate the performance of heat recovery device attached to exhaust gas flue connected to combustion chamber of greenhouse heating system. The experimental heat recovery system is mainly consisted of LPG combustion chamber and two heat recovery units; unit-A is attached directly to the exhaust gas flue, and unit-B is connected with unit-A. Heat recovery performance was evaluated by estimating total energy amounts by using enthalpy difference between two measurement points together with mass flow rate of gas and/or air passing through each heat recovery unit depending on 5 different flow rates controlled by voltage meter. The results of this experimental study, such as heat exchange behavior of supply air tubes and exhaust air passages crossing the tubes, pressure drop between inlet and outlet, heat recovery performance of exchange unit, etc., will be used as fundamental data for designing optimum heat recovery device to be used for fuel saving purpose by reducing heat loss amounts mostly wasted outside of greenhouse through flue.

• Journal of KIISE:Information Networking
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• v.37 no.4
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• pp.255-262
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• 2010

Recently, automated signature generation systems(ASGSs) have been developed in order to cope with zero-day attacks with malicious codes exploiting vulnerabilities which are not yet publically noticed. To enhance the usefulness of the signatures generated by (ASGSs) it is essential to identify signatures only with the high accuracy of intrusion detection among a number of generated signatures and to provide them to target security systems in a timely manner. This automated signature exchange, distribution, and update operations have to be performed in a secure and universal manner beyond the border of network administrations, and also should be able to eliminate the noise in a signature set which causes performance degradation of the security systems. In this paper, we present a system architecture to support the identification of high quality signatures and to share them among security systems through a scheme which can evaluate the detection accuracy of individual signatures, and also propose a set of algorithms dealing with exchanging, distributing and updating signatures. Though the experiment on a test-bed, we have confirmed that the high quality signatures are automatically saved at the level that the noise rate of a signature set is reduced. The system architecture and the algorithm proposed in the paper can be adopted to a automated signature sharing framework.

• Proceedings of the Korea Contents Association Conference
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• 2003.05a
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• pp.237-244
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• 2003

With the rapid development of information and communication technologies(ICTs) and internet technology and the explosive increasing of internet users, we can find almost every municipal information of local governments by visiting the home page without visiting the city hall personally. And in the case of urban planning information they provide many kinds of information to inform the policy and results of urban planning to citizens The differences of urban planning information from other municipal information, at first many information of urban planning should be presented as spatial data, so we have to provide the geographic information with internet GIS, and second to realize bottom-up decision making process the exchanging of information between citizen and government should be adopted as bulletin board system(BBS) and an questionnaire in internet In this paper I evaluated the sites of urban planning information in the homepage of local governments by many index. the index are composed with 4 categories 20 items on information providing, 3 categories 12 items on communication, and 2 categories 8 items on internet GIS. And as a result I introduce some high scored sites at each category, and propose that we have to recognize the internet as the technological media to broaden the opportunities for the community people to participate in the policy-making in reference to their political demands.