• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.573-575
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• 2014

클럭 경쟁에서 코어 경쟁으로 전환된 요즘. 병렬 프로그래밍은 중요 하다. 동기화 개체를 사용하면 병목 현상이 발생하며, 1:1 Thread 모델은 자원의 낭비와 문맥전환 비용이 발생한다. Thread 풀 모델은 직렬화에 약점을 가지는게 되는데, 본 논문에서는 다중 개체 대응에 적합한 병렬 프로그래밍 모델을 제시한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.5B
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• pp.520-530
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• 2004

A multidatabase system (MDBS) is designed to provide universal access to distributed data across multiple autonomous, heterogeneous local database systems (LDBSs). In this paper, we propose a global concurrency control (GCC) algorithm in MDBS. The proposed GCC algorithm adopts the idea of message ordering in group communication messaging system. A necessary condition of GCC algorithm is that global transactions are serialized in the same order at all LDBSs that they execute. n all operations of a transaction are bundled in a single message and the message arrives at LDBSs in the same order using message ordering property, each LDBS can perform subtransactions in the same order. As a result, message ordering allows to determine easily the relative serialization order of global transactions, and then it can support a local autonomy without any information about the serialization order of transactions executing locally.

• Journal of KIISE:Databases
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• v.31 no.2
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• pp.140-149
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• 2004

Data broadcast has received much attention as a very efficient method for disseminating data items in mobile environment with large number of mobile clients. In this approach, a database server periodically and continuously broadcasts data items through wireless channels and clients perform read-only transactions by accessing necessary data items from the air. While broadcasting, the server must also process update transactions on the database, which raises an obstacle for client's accessing consistent data. In this research, we propose a new algorithm SCDSC(Serialization Checking with DirtySet on Commit) which is an alternative for solving the concurrency control problem efficiently. The SCDSC is a kind of optimistic concurrency control in that a client checks the consistency of data using a DirtySet as a part of data broadcast when it commits its transaction. In each broadcast cycle, the server updates and disseminates the DirtySet with newly changed data items for last few cycles in the sliding window approach. We perform an analysis and a simulation study to evaluate the performance of our SCDSC algorithm in terms of data consistency and data currency.

• Journal of KIISE:Computing Practices and Letters
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• v.5 no.4
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• pp.479-488
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• 1999

인터넷의 성장과 더불어 수많은 응용시스템들이 인터넷 기반 시스템으로 바뀌고 있다. 특히, 인터넷 기반 전문가시스템은 다양한 구조와 방법으로 설계될 수 있고 이미 제작되었던 수많은 인터넷 기반 전문가시스템들은 그 나름대로의 장단점을 가지고 있다. 본 연구는 특정 전문가시스템의 개발이 아니라 WWW(World Wide Web)을 사용자 인터페이스로 이용할 수 있는 전문가시스템 쉘에 관한 연구이다. 본 시스템은 WWW 하부구조에 대한 의존성을 제거, 클라이언트와 네크워크에 부담 격감, HTML과 부합하는 텍스트에 기초한 통신과 같은 장점 외에 중앙 집중적 다중 사용자 접근 관리 기능을 제공한다. 본 시스템은 다중사용자를 위한 서버/클라이언트 환경 구축을 위해 소켓을 이용하여 큐잉(queueing)과 직렬화(serialization)를 해결하고 비연결 지향적인 WWW의 특성으로 인한 사용자 관리의 어려움은 사용자의 IP 주소와 Timer를 이용한 휴무기간 검사를 이용하여 해결한다.Abstract The growth of internet drives many applications into internet-based systems. Internet-based expert systems can be designed with various concepts and methodologies, and they have their own merits and demerits. This papers is a study on a development of not expert system itself but expert system shell which is able to use WWW(World Wide Web) as user interface. The suggested system supports functions on multiuser management controlled by a server system as well as independence on development environments, minimization of the load for clients and network, and text-based communications such as HTML. The system uses socket, which solves problems of queuing and serialization, in order to construct multiuser server/client environmen and also the system solves the non-connective property of WWW which makes it difficult to control users and processes by using IP address and idle time which is supported by the timer.

• The KIPS Transactions:PartC
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• v.15C no.1
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• pp.61-68
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• 2008

With the rapid advancement of mobile communication, mobile devices are evolving into convergence devices with various multimedia capabilities. But, high performance of devices demands complicated settings, and thus contains latent error possibilities, and poor system performance caused by the collision of different softwares. To solve these problems, device management becomes an important issue. Open Mobile Alliance(OMA) developed OMA DM(Device Management), which is a device management standard. Recently released OMA DM v1.2 provides improved mobile device management methods compared to earlier versions. This paper introduces design and implementation of OMA DM v1.2 based management agent. By using Tree and Description Serialization(TNDS) for acquiring, adding, and editing objects in the mobile devices, it provides more effective device management with small amount of network traffic.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2001.10a
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• pp.61-64
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• 2001

We propose a message-based communication protocol for software agents. An emphasis is placed on the problems of sharing and exchanging information through agent communication. We adopt the Resource Description Framework (RDF) schema for information modelling in business domain. The eXtensible Markup Language (XML) serialization is used to generate messages for agent communication. The use of XML and RDF enables software agents to understand the contents of messages correctly and consistently. We believe that the approach can provide a promising way to the automation of business processes through seamless communication among the partners.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.4 no.4
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• pp.35-42
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• 1981

This paper grasped the labor productivity actual condition by the standard of per unit working hour and production about the main products of our country's industrial the main materials and could understand the average of our country's labor productivity as compared this with the labor productivity actual condition of Japan. As the point at issue of analitical result. 1. Low a matter of thinking about productivity. 2. Have a lot of difficult problem in an industrial part. 3. Have the point at issue on technical development and accumulation. 4. Have the point at issue on management. As a countermeasure about these. 1. must convert the way of use of industrial policy. 2. must make a housing development and special serialization of a small and medium enterprise. 3. must establish an organic technical development system. 4. must grope the policy of management rationalization.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.1-3
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• 2008

환경오염과 화석에너지의 고갈 및 가격 급등에 따라 신재생에너지에 대한 관심이 고조되고 있고 특히 태양광발전시스템은 전 세계적으로 그 수요가 폭발적으로 급증하고 있다. 본 논문에서는 태양광발전시스템의 최종단에서 가장 중요한 역할을 하는 태양광 인버터의 특별 사양에 대해 약술하고 당사에서 개발한 중소용량 인버터와 발전소용과 해외시장 진출을 목표로 개발 중인 250kW급 태양광 인버터에 대한 개발사례에 대하여 기술한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.10
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• pp.2945-2951
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• 2009

By observing and classifying the articles that are centering around the forecasting information which are dealing with the health related articles in the mass media such as the daily press, KBS1 9 O'clock news, and TV broadcast station's health serialization program, this research was to fulfill ultimately to present health predicted execution for the data on the present state of analysis for the general public to acquire the health related information and to practice the presented basic data of the useful health information to the patients and general public by understand the tendency of the health related information that is presented to the general public. The period of the subject for analysis conducted in a year, started in January 1st, 2006 and finished in December 31st 2006. The research sampled about 50% of the subject of analysis by using the computer's random sampling in considering the quantity of work. Look in to the subject of health information, the daily news paper illustrated in the order of the cause of diseases and dangerous factor (15.5%), the medical treatment and techniques, the medication(15.4%), and the health promotion(14.6%), and the TV news presented the subject on the cause of diseases and dangerous factor(27.5%) the most, and the least presented in the order of the mechanics(24.2%), and the administrator(11.3%).

• Journal of Internet Computing and Services
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• v.4 no.6
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• pp.87-93
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• 2003

Data Replication makes distributed system and database system improved in availability and performance. But it is difficult to keep strict consistency in data update. Existing algorithms keep strict consistency, but have problems of cost a great deal and delay time. It is to introduce hybrid update propagation algorithm which permits eager update for original copy and propagates lazy update for other copies. Hybrid update propagation algorithm also permits group update in ownership. This algorithm menages replica version in order to control group update consistency. Consistency and performance is improved by combining eager update and lazy update with group ownership. Simulation shows improvement of transaction throughput and response time depending on application and execution environment.