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송석일,Song, S.I. 한국전자통신연구원 2000 전자통신동향분석 Vol.15 No.6
홈 네트워크의 표준화를 추진하는 분야활동은 크게 매체에 의해서 유/무선으로 구분될 수 있다. 여기서 소개하는 이외에도 홈 네트워크를 목표로 하는 활동분야는 많지만 여기서는 최근 활동이 활발한 분야인 TA1394/HAVi, USB2, Home PNA, 전력선 통신, 무선 1394, Home RF-WG, 블루투스, IrDA의 표준화 단체를 중심으로 국내외 표준 규격화 동향에 대하여 기술한다.
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송석일,정태진,Song, Seok-Il,Jeong, Tae-Jin 한국전자통신연구원 1996 전자통신동향분석 Vol.11 No.3
본 고에서는 멀티미디어 이동체 통신핵심 관련 기술분야인 멀티미디어 이동체통신을 위한 음성, 화상의 정보압축기술과 표준화동향에 대하여 서술하고, 개인이동통신의 무선액세스 기술과 개인이동통신을 지원하는 인텔리전트 네트워크의 개념에 따른 이동네트워크의 플렛폼화를 목표로 한 구조에 대하여 기술한다.
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Continuous Skyline Query on Sensor Network
송석일 한국정보기술학회 2011 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.1 No.2
Data centric storages for sensor networks have been proposed to efficiently process multi-dimensional range queries as well as exact matches. Usually, a sensor network does not process only one type of the query but supports various types of queries such as range queries, exact matches and skyline queries. Therefore, a sensor network based on a data centric storage for range queries and exact matches should process skyline queries efficiently. However, existing algorithms for skyline queries have not considered the features of data centric storages. Some of the data centric storages store similar data in sensor nodes that are placed on geographically similar locations. Consequently, all data are ordered in a sensor network. In this paper, we propose a new skyline query processing algorithm that exploits the above features of data centric storages.
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송석일,이석희,유재수,Song, Seok-Il,Lee, Seok-Hui,Yu, Jae-Su 한국정보처리학회 2000 정보처리논문지 Vol.7 No.7
In this paper, we propose a recovery method for high dimensional index structures. It recovers efficiently transactions including reinsert operations that needs undo or rollback due to system failures or transaction failures. It is based on WAL(Write Ahead Logging) protocol. We apply the method to the FCIR-Tree and implement it based on MiDAS-III which is the storage system of a multimedia DBMS, called BADA-III. We also show through performance evaluation that the recovery method with our algorithm recovers reinsert operations efficiently over that without our algorithm.
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Dynamic Log Page Allocation Method for Flash Memory
송석일,길기정 한국정보기술학회 2011 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.1 No.1
Due to advantages of NAND flash memory such as non-volatility, low access latency, low energy consumption, light weight, small size and shock resistance, it has become a better alternative over traditional magnetic disk drives, and has been widely used. Traditional DBMSs including mobile DBMSs may run on flash memory without any modification by using Flash Translation Layer (FTL), which emulates a random access block device to hide the characteristics of flash memory such as “erase-before-update”. However, most existing FTLs are optimized for file systems, not for DBMSs, and traditional DBMSs are not aware of them. Also, traditional DBMSs do not consider the characteristics of flash memory. In this paper, we propose a flash-conscious storage system for DBMSs that utilizes flash memory as a main storage medium, and carefully put the characteristics of flash memory into considerations. The proposed flash-conscious storage system exploits log records to avoid costly update operations. It is shown that the proposed storage system outperforms the state of the art flash-conscious DBMSs through the simulation.
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An Empirical Study on Supporting System for Agricultural Product Storage Technology
송석일,곽윤식 한국정보기술학회 2014 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.4 No.1
Most of the existing agricultural product management systems based on ICT convergence are designed to trace the history of harvesting and distribution procedures or to monitor the growth process. ICT convergence management system needs to grow beyond the boundary of merely tracing the distribution history and monitoring growth environments; it should monitor environmental factors that affect agricultural products in the storage and distribution process, measure the level of deterioration based on the monitoring result, and thus reduce the rates of disposal due to quality deterioration. In addition, there should be a system to predict prices of agricultural products and to determine the best timing of sales so that farmers can sell goods at reasonable prices. This study relates the basic structure and functions of this system and presents the result of the empirical research project.
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An Empirical Study on Agricultural Product Distribution Technology by Means of ICT Convergence
송석일,곽윤식 한국정보기술학회 2014 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.4 No.1
When it comes to the high distribution cost ratio of agricultural products, the major causes include lack of competition among distribution channels and inefficiency of distribution steps in addition to inevitable aspects such as the large volume and weight compared to the price, distance between producers and consumers, advanced types of consumption, gradual decomposition, and natural spoilage, the last two of which are primary factors that increase the distribution cost ratio. In general, agricultural products are vulnerable to supply shock, and thus price fluctuation rates are higher than those of industrial products. In particular, vegetables and fruits, which are difficult to keep fresh for a long period of time and easily affected by weather conditions, are of high price fluctuation rates. For these reasons, it is of urgent need to come up with ways to minimize natural spoilage and disposal in distribution of agricultural products. The suggested system provides various functions : a function to predict weight reduction of products during the storage and distribution process based on the analysis of data collected by the server to judge the level of quality deterioration.
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송석일,김영일,유병한,안지환,Song, S.I.,Kim, Y.I.,Ryu, B.H.,Ahn, J.H. 한국전자통신연구원 2004 전자통신동향분석 Vol.19 No.3
초고속 유선 인터넷 서비스의 성숙된 시장환경에서 이동중에도 인터넷 서비스를 제공 받으려는 사용자의요구가 증가되고 있으며, 이러한 요구를 수용하기 위한 기술로서 휴대인터넷이 주목 받고 있다. 본 고에서는 휴대 인터넷의 표준화 동향을 중심으로 서비스 실현을 위해 고려되어야 하는 요소기술과 연구개발이 진행되고 있는 외국의 휴대인터넷 기술사례에 대하여 살펴보고, 한국전자통신연구원과 통신업체(제조업체 및 통신사업자)들이 협력하여 연구 개발중인 초고속 휴대인터넷(High-Speed Portable Internet: HPi) 시스템의 구조 및 기능을 중심으로 기술한다.
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Survey on Seamless Migration Methods in Cloud Computing Environments
송석일 한국정보기술학회 2012 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.2 No.2
Generally, in cloud platforms, multiple applications (tenants) are hosted in a single node and they show various load patterns that are not easy to predict. Also, since cloud platforms usually use pay-per-use policy, they should be able to minimize the operating cost. Consequently, elastic load balancing to scale up and down according to work load is the most important feature for cloud providers. A low cost live migration is the key technique for the elastic load balancing. Subsequently, many migration methods have been proposed. In this paper, we summarize them, and analyze them in terms of several aspects. Finally, we compare the methods and draw further research issues
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