• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1996.06b
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• pp.128-133
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• 1996

In this paper, we describe the design and implementation of a multimedia information system integrating hypermdia, information retrieval, and DBMS technologies. We browse the information space through hypermedia link navigation and also use ad hoc queries for direct retrieval of information from the database. Both the hypermedia and the information retrieval systems are integrated into a database management system (DMBS) so that concurrent edition, update, and retrieval of documents can have the ACID properties of atomicity, consistency, isolation, and durability. We will first explain the architecture of the system and then, describe how the hypermedia system is integrated with information retrieval capability, and finally integrated with DBMS capabilities.

• Applied Science and Convergence Technology
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• v.27 no.5
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• pp.95-99
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• 2018

We discuss the structural and optical characteristics of GaN nanowires (NWs) grown on Si(111) substrates by a plasma-assisted molecular-beam epitaxy. The GaN NWs with high crystal quality were formed by adopting a new growth approach, so called Ga pre-deposition (GaPD) method. In the GaPD, only Ga was supplied without nitrogen flux on a SiN/Si surface, resulting in the formation of Ga droplets. The Ga droplets were used as initial nucleation sites for the growth of GaN NWs. The GaN NWs with the average heights of 60.10 to 214.62 nm obtained by increasing growth time. The hexagonal-shaped top surfaces and facets were observed from the field-emission electron microscope images of GaN NWs, indicating that the NWs have the wurtzite (WZ) crystal structure. Strong peaks of GaN (0002) corresponding to WZ structures were also observed from double crystal x-ray diffraction rocking curves of the NW samples. At room temperature, free-exciton emissions were observed from GaN NWs with narrow linewidth broadenings, indicating to the formation of high-quality NWs.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.18 no.5
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• pp.1163-1185
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• 2024

With the sharp increase in the volume of literature data, researchers must spend considerable time and energy locating desired papers. A paper recommendation is the means necessary to solve this problem. Unfortunately, the large amount of data combined with sparsity makes personalizing papers challenging. Traditional matrix decomposition models have cold-start issues. Most overlook the importance of information and fail to consider the introduction of noise when using side information, resulting in unsatisfactory recommendations. This study proposes a paper recommendation method (PR-SLSMF) using document-level representation learning with citation-informed transformers (SPECTER) and low-rank and sparse matrix factorization; it uses SPECTER to learn paper content representation. The model calculates the similarity between papers and constructs a weighted heterogeneous information network (HIN), including citation and content similarity information. This method combines the LSMF method with HIN, effectively alleviating data sparsity and cold-start issues and avoiding topic drift. We validated the effectiveness of this method on two real datasets and the necessity of adding side information.

• Information and Communications Magazine
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• v.28 no.6
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• pp.84-90
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• 2011

본 논문은 2011년 4월 IEEE SA에서 차세대 이동통신 규격으로 승인된 IEEE 802.16m의 구현에 관한 것이다. 승인된 규격은 ITU-R에서 4세대 이동통신 표준인 IMT-Advanced 표준 기술로 확정될 예정이며, 국내에서는 WiBro-Advanced, 해외에서는 Wireless MAN-Advanced 또는 WiMAX-2로 불린다. 이 규격을 기반으로 2009년부터 규격의 표준화 활동과 함께 시스템 개발을 시작하여, 2010년 12월 1차 개발을 완료하였다. 개발된 WiBro-Advanced 시스템은 ITU-R이 요구하는 4세대 이동통신의 요구사항을 만족하고 있다. 본 논문은 구현된 시스템의 핵심 기술에 대해 기술하고, 기술적인 특징들을 살펴본다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.555-556
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• 2009

본 논문에서는 Workflow Management System(이하 WMS)인 Kepler와 Pegasus를 정책 기반 자원 관리 시스템과 통합한 Hybrid Workflow 관리 시스템을 제안하고, 이를 통해 사용자의 서비스 수준 합의 (Service Level Agreement, SLA) 사항에 따라 서비스 요구 수준을 보장할 수 있는 Workflow 관리 시스템을 구현하여 성능 평가를 수행하였다.

• International journal of advanced smart convergence
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• v.12 no.1
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• pp.59-63
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• 2023

We create a malware detector classification method with using the Sequential Probability Ratio Test (SPRT) in IoT. More specifically, we adapt the SPRT to classify malware detectors into two categories of basic and advanced in line with malware detection capability. We perform evaluation of our scheme through simulation. Our simulation results show that the number of advanced detectors is changed in line with threshold for fraction of advanced malware information, which is used to judge advanced detectors in the SPRT.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.361-363
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• 2021

Digital character rigging is an important technology to improve animation vividness, and there are many kinds of complex ways of rigging system. To move naturally, the fish are tested for movement. Because 2,4 family role information although some, but the study of fish (0 family) action information is not much. As the diversity and complexity of fish production increases, inefficient time and capital are required. How to build a fish-like skeleton system depends on how to build an efficient and agile rigging program. The aim of this study is to compare the Advanced Skeleton-based animation process with Maya Rig, which can solve the high time-cost rigging problem, and to explore the best automatic plug-in based on the advantages of Advanced Skeleton, broadening the research scope of fish animation.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.149-153
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• 2006

외부 조인은 조인에 참여하는 릴레이션들에서 조인 조건을 만족하지 않는 한쪽 또는 양쪽 튜플들도 결과로 반환하는 조인 연산으로 OLAP 질의 처리, 계층적 뷰 처리, 중첩 질의 처리 등의 다양한 고급 데이타베이스 응용에서 널리 사용된다. 많은 상용 DBMS에서 외부 조인을 지원하고 있으나, 상세한 구현 방법은 공개되어 있지 않다. 본 논문에서는 한국과학기술원 멀티미디어 및 데이타베이스 연구실에서 개발하고 있는 오디세우스 객체관계형 DBMS를 위한 외부 조인을 설계하고 구현한다. 본 논문에서는 거의 모든 DBMS에서 제공 되는 가장 기본적인 조인 방법인 중첩 루프 조인 알고리즘을 확장하여 외부 조인 연산을 구현한다. 그리고, 외부 조인이 포함된 질의를 최적화하기 위해 조인 연산의 결과를 임시 릴레이션에 저장하는 대신에 다음 조인 연산의 입력으로 파이프라이닝시키는 것을 최대화 하는 방법을 제안한다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2003.09a
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• pp.11-15
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• 2003

Amount of biological data information has been increasing exponentially. In order to cope with this bio-information explosion, it is necessary to construct a biological data information integration system. The integration system could provide useful services for bio-application developers by answering general complex queries that require accessing information from heterogeneous bio data sources, and easily accommodate a new database into the integrated systems. In this paper, we analyze architectures and mechanisms of existing integration systems with their advantages and disadvantages. Based on this analysis and user requirement studies, we propose an integration system framework that embraces advantages of the existing systems. More specifically, we propose an integration system architecture composed of a mediator and wrappers, which can offer a service interface layer for various other applications as well as independent biologists, thus playing the role of database management system for biology applications. In other words, the system can help abstract the heterogeneous information structures and formats from the application layer. In the system, the wrappers send database-specific queries and report the result to the mediator using XML. The proposed system could facilitate in silico knowledge discovery by allowing combination of numerous discrete biological information databases.

• International Journal of Advanced Culture Technology
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• v.3 no.2
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• pp.77-86
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• 2015

In this paper there is an overview of some standards and security models which are implemented in such an IP-based and heterogeneous networks and we also present some security models in an open environment and finally we obtain that as a result of the nature of 4G networks there are still more security holes and open issues for expert to notice. Our survey shows that a number of new security threats to cause unexpected service interruption and disclosure of information will be possible in 4G due mainly to the fact that 4G is an IP-based, heterogeneous network. Other than that, it tells about the security issues and vulnerabilities present in the above 4G standards are discussed. Finally, we point to potential areas for future vulnerabilities and evaluate areas in 4G security which warrant attention and future work by the research and advanced technology industry.