• The Transactions of the Korea Information Processing Society
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• 제6권11호
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• pp.3034-3045
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• 1999

For efficiently providing multimedia services, distributed computing environments are specified the requirements of various services and distributed object platforms applied an object-oriented technology by TINA Consortium and OMG CORBA. Because multimedia service applications are becoming large and distributing, their servicing managing interfaces among objects are being complicated. In order to solve these defects, it is necessary to suggest a new object grouping model and specify object service/management requirements can be introduced under the object groups. We have been developed the distributed object group platform that can group all individual objects by the relating services and can supply trading functions for interconnecting between distributed objects or object groups. In this paper, we designed and implemented the Virtual Drawing Board for remote equational services on the distributed object group platform we mentioned above. As results, we designed a basic structure and service interfaces, and showed execution procedures of VDB system consisted of distributed objects and objects groups for educational services. For supporting distributed services of VDB system, we used three kinds of tools as follows; IONA orbix 2.2 of CORBA compliance as an object middleware, OrbixTrader 1.0 for interconnection of distributed objects, and the OGTG we developed for interconnection of distributed object groups and checking access rights of objects included in an arbitrary object group.

• Journal of Information Processing Systems
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• 제13권2호
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• pp.236-255
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• 2017

The rapid growth of smart devices demands an enhanced throughput for network connection sustainability during mobility. However, traditional wireless network architecture suffers from mobility management issues. In order to resolve the traditional mobility management issues, we propose a novel architecture for future wireless access network based on software-defined network (SDN) by using the advantage of network function virtualization (NFV). In this paper, network selection approach (NSA) has been introduced for mobility management that comprises of acquiring the information of the underlying networking devices through the OpenFlow controller, percepts the current network behavior and later the selection of an appropriate action or network. Furthermore, mobility-related scenarios and use cases to analyze the implementation aspects of the proposed architecture are provided. The simulation results confirm that the proposed scenarios have obtained a seamless mobility with enhanced throughput at minimum packet loss as compared to the existing IEEE 802.11 wireless network.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2003년도 추계학술발표논문집 (중)
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• pp.729-732
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• 2003

연구자 및 연구관리기관의 효율적인 연구업무를 지원하기 위해 국내의 많은 연구기관들이 시스템을 도입하여 운용하고 있다. 좀더 효율적인 연구 활동을 지원하고 연구과제의 관리 및 데이터의 공유, 검색, 저장을 위해 XML 기반의 연구과제 제안서 접수 시스템을 개발하였다. 개발된 연구과제제안서 접수시스템은 한글과 같은 워드프로세서로 작성된 문서를 접수 받아서 XML로 변환 후 데이터 베이스에 저장하는 시스템으로 연구과제 관리 업무의 효율성 및 문서관리, 검색, 저장을 용이하게 할 수 있다. 본 연구에서 개발된 시스템은 정부출연연구원 및 21세기 프론티어 사업단에 보급되어 현재 운용되고 있다.

• Journal of Information Processing Systems
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• 제7권1호
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• pp.121-136
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• 2011

With the rapid growth of GPS-enable Smartphones, the interest on using Location Based Services (LBSs) has increased significantly. The evolution in the functionalities provided by those smartphones has enabled them to accurately pinpoint the location of a user. Because location information is what all LBSs depend on to process user's request, it should be properly protected from attackers or malicious service providers (SP). Additionally, maintaining user's privacy and confidentiality are imperative challenges to be overcome. A possible solution for these challenges is to provide user anonymity, which means to ensure that a user initiating a request to the SP should be indistinguishable from a group of people by any adversary who had access to the request. Most of the proposals that maintain user's anonymity are based on location obfuscation. It mainly focuses on adjusting the resolution of the user's location information. In this paper, we present a new protocol that is focused on using cryptographic techniques to provide anonymity for LBSs users in the smartphone environment. This protocol makes use of a trusted third party called the Anonymity Server (AS) that ensures anonymous communication between the user and the service provider.

• Journal of Digital Contents Society
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• 제19권2호
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• pp.335-341
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• 2018

There exists a limit in efficient processing of mixed workloads that database markets requires in recent years since existing database systems utilize a static page storage model. In this paper we propose a dynamic page storage model that can reflect the characteristics of mixed workloads. We also describe how to extract optimized column groups from given mixed workloads and how to construct pages dynamically. Finally, we show in our experiments that the proposed model is more efficient than the existing model in processing given mixed workloads.

• Journal of Information Processing Systems
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• 제1권1호
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• pp.14-21
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• 2005

Even though mainly statistical methods have been used in anomaly network intrusion detection, to detect various attack types, machine learning based anomaly detection was introduced. Machine learning based anomaly detection started from research applying traditional learning algorithms of artificial intelligence to intrusion detection. However, detection rates of these methods are not satisfactory. Especially, high false positive and repeated alarms about the same attack are problems. The main reason for this is that one packet is used as a basic learning unit. Most attacks consist of more than one packet. In addition, an attack does not lead to a consecutive packet stream. Therefore, with grouping of related packets, a new approach of group-based learning and detection is needed. This type of approach is similar to that of multiple-instance problems in the artificial intelligence community, which cannot clearly classify one instance, but classification of a group is possible. We suggest group generation algorithm grouping related packets, and a learning algorithm based on a unit of such group. To verify the usefulness of the suggested algorithm, 1998 DARPA data was used and the results show that our approach is quite useful.

• Nuclear Engineering and Technology
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• 제50권3호
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• pp.340-355
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• 2018

The methods and performance of a fast reactor multigroup cross section (XS) generation code EXUS-F are described that is capable of directly processing Evaluated Nuclear Data File format nuclear data files. RECONR of NJOY is used to generate pointwise XS data, and Doppler broadening is incorporated by the Gauss-Hermite quadrature method. The self-shielding effect is incorporated in the ultrafine group XSs in the resolved and unresolved resonance ranges. Functions to generate scattering transfer matrices and fission spectrum matrices are realized. The extended transport approximation is used in zero-dimensional calculations, whereas the collision probability method and the method of characteristics are used for one-dimensional cylindrical geometry and two-dimensional hexagonal geometry problems, respectively. Verification calculations are performed first for various homogeneous mixtures and cylindrical problems. It is confirmed that the spectrum calculations and the corresponding multigroup XS generations are performed adequately in that the reactivity errors are less than 50 pcm with the McCARD Monte Carlo solutions. The nTRACER core calculations are performed with the EXUS-F-generated 47 group XSs for the two-dimensional Advanced Burner Reactor 1000 benchmark problem. The reactivity error of 160 pcm and the root mean square error of the pin powers of 0.7% indicate that EXUF-F generates properly the broad-group XSs.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2010년도 추계학술발표대회
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• pp.1434-1437
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• 2010

본 논문은 철강공정을 위한 미들웨어 구조를 제시하였다. 제안된 미들웨어는 커널 코어, 철강공정에 필요한 각 서비스 기능, 응용 소프트웨어와의 연결을 유지하는 채널 매니저, 응용 소프트웨어의 서비스 요구를 처리하는 API 핸들러, 미들웨어 사용 API로 구성된다. 제안된 미들웨어는 분산환경을 지원하며, 산업체에서 주로 사용되는 운영체제들을 지원하도록 구현하였다. 제안된 미들웨어에 대해 각 서비스의 성능이 측정되었으나, 지면상 본 논문에는 동기 메시지 서비스, 타이머 서비스의 성능만을 제시하였다. 또한 제안된 미들웨어를 철강공정 중 하나인 열간압연공정에 적용한 결과, 기존 상용 미들웨어를 사용한 환경에 비해 응답시간 성능이 30-35% 향상하였음을 보였다.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2011년도 추계학술발표대회
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• pp.854-857
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• 2011

전자 결재 시스템은 오프라인 문서 결재보다 효율적인 문서 관리가 가능 하고 예산 낭비를 방지할 수 있으며, 작업 능률을 극대화 할 수 있다는 장점 때문에 현재 많은 기업에서 도입하여 사용하고 있다. 하지만 상용화되어 있는 전자 결재 시스템에서 사용되는 이미지 서명은 복제 및 위조가 가능하다는 위협이 존재한다. 이러한 문제를 해결하기 위해서 단순 서명 방식을 적용한 전자 결재 시스템이 제안되었다. 하지만 단순 서명 방식을 이용한 전자 결제 시스템은 단 한 명의 결재자만을 고려한 시스템으로 실제 기업에는 다양한 직책의 결재자가 존재하기 때문에 적용하기가 어렵다. 이에 본 논문에서는 C.Boyd 의 순차 다중서명 방식을 사용하여 다수의 결제자가 서명할 수 있는 전자 결제 시스템을 제안한다.

• The Journal of Fisheries Business Administration
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• 제46권3호
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• pp.1-14
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• 2015

This study aims to examine factors affecting the seafood processing business of primary cooperatives. For this purpose, I divided primary cooperatives that participate to seafood processing business into three group by sales scale. And then analyzed survey results for the four items that might be affecting the seafood processing business, type of seafood processing methods, HACCP certification status, distribution channels, processing difficulties during project implementation, etc. The result offers four implications. First, It is desirable to reduce the burden of the initial investment by leveraging the consignment process at the initial entry to seafood processing business. Second, HACCP certification is essential factor in order to promote seafood processing business as a long-term economic business. Third, To the steady growth of the seafood processing business, it is important to secure fixed large customers, as well as a individual customer. Fourth, For the continued growth of the seafood processing business it should be approached differently by way of sales, when the National Federation of Fisheries Cooperatives support to primary cooperatives.