• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.43 no.7 s.349
• /
• pp.50-59
• /
• 2006

The new communication paradigm is rapidly shifted from wireless mobile networks to an All-IP(Internet Protocol) network, led by service industry leaders and communication manufacturers. In this paradigm, providing authentication and session keys of a subscriber becomes one of the critical tasks because of IP open accessibility among heterogeneous networks. In this paper, we introduce authentication process procedure of heterogeneous wireless mobile networks and develop so-called IMAS(Integrated Mobile Authentication Server) which can securely inter-work among all mobile networks and support the legacy networks with backward compatibility. Especially, in designing IMAS, mobile authentication inter-working mechanism, key management technique, and other issues to be overcome are presented. We analyze and evaluate the performance of authentication algorithm which creates session key. A simulation environment of IMAS is established, and a performance(TPS; Transaction Per Second) result is analyzed and evaluated. It turned out that IMAS works among heterogeneous wireless mobile networks without compensating efficiency and functionalities of the legacy networks and decrease the entropy of data redundancy and data inconsistency among networks because of the integrity of the distributed Data Base(DB).

• Journal of KIISE:Computing Practices and Letters
• /
• v.16 no.4
• /
• pp.392-404
• /
• 2010

Recently, as both business processes and IT systems become ever more complex. Especially, enterprise applications tend to become unmanageably complex and increasingly costly to maintain. Therefore complexity is the insidious enemy of software development. It is critical to have a methodology that recognizes and manages this enemy effectively. In this paper, we propose ISIS (Integrated System of Independent Subsystems) - the architectural style needed to develop the complex enterprise applications. The ISIS was developed to meet the challenge of reducing the complexity of a larger enterprise application today. It gives us architecture models for reducing development complexity and composite application. The enterprise application is partitioned into a collection of independent subsystems using ISIS decomposition schemes and equivalence relations. We use middleware named ISIS engine that provides a service for subsystems interoperability by enabling the integration of distributed, cross-platform subsystems. We have implemented an ITSM system that achieves our objectives, reducing development complexity, using the ISIS architecture. Finally, ISIS architecture provides greater flexibility and productivity when an organization needs either to change its business processes, or to update the underlying systems.

• Annual Conference of KIPS
• /
• 2003.11a
• /
• pp.157-160
• /
• 2003

최근 그리드 미들웨어 개발 연구는 과학적 어플리케이션뿐만 아니라 상업적인 비즈니스 어플리케이션에서 활용가능하도록 웹서비스(Web service) 기술을 활용하고 있다. 이를 통해 정의된 그리드 서비스 구조를 Open Grid Service Architecture(OGSA)라고 한다. OGSA 를 통해 정의된 그리드 서비스 개념은 GGF 를 통해 OGSI 라는 표준 기술 명세서로 채택되었다. OGSI 를 지원하는 그리드 서비스는 확장성있고 상호운용성을 높여 다른 서비스와의 연동 및 통합을 쉽게 이루게 한다. 본 논문에서는 기존의 그리드 정보 서비스를 OGSI 기반의 서비스 구조인 Grid Advanced Information Service(GAIS)로 재구성한다. CAIS 는 그리드 미들웨어의 기본 서비스로써 다음의 특징을 가진다. 우선, 기존의 GT3 기반의 그리드 정보 서비스와의 서비스 인터페이스 측면에서 호환성을 가지면서, 내부적으로 동적 Virtual Organiaation(VO)관리 기능을 추가로 가진다. 그리고, 여러 GAIS 들간의 VO 정보를 관리할 수 있도록 Peer-to-peer 기반의 정보 분산기능을 가진다. 또한, GAIS 내 등록된 서비스들에 대해서는 Service data에 따른 그룹화를 통해 서비스 discovery기능을 강화하게 된다. 그리드 사용자는 GAIS 를 통해 다양한 VO 에 대한 정보를 검색하고, VO 의 생성 및 참여할 수 있고, 자신이 속한 VO 에 대하여 효율적으로 자원정보 및 서비스 데이터(Service Data)를 접근할 수 있다.

• Information and Communications Magazine
• /
• v.30 no.2
• /
• pp.51-58
• /
• 2013

글로벌 기후변화 및 에너지 고갈 문제가 전(全) 지구적 이슈로 부각됨에 따라 다양한 그린 에너지기술에 대한 연구가 활발하게 진행되고 있고, 기존 주력 기술분야와 정보통신기술과의 융합을 통한 새로운 기술개발이 활발하게 추진되고 있다. 스마트그리드 기술은 이러한 패러다임에서 탄생한 기술 분야이며, 녹색 기술의 대표적인 기술 사례로 분류되고 있다. 스마트그리드에 대한 개념이 국내에 도입된 이후 기술 개발 성과 실증과 비즈니스 모델을 발굴하고자 시작되었던 제주 스마트그리드 실증단지 구축 사업도 금년 5월을 기점으로 완료될 예정이다. 스마트그리드 실증단지 구축을 통해 소비자 도메인에서의 다양한 에너지관리 솔루션 구축 방법에 대하여 확인할 수 있는 기회도 되었으나 표준화 기반의 상호운용성이 확보되지 않아 컨소시엄 간의 시스템 연동이 어려운 문제도 확인할 수 있었다. 스마트그리드는 보다 강건하고 신뢰성 있는 전력시스템의 현대화 및 지능화를 위하여 ICT(Information and Communication Technology) 기술을 활용하는 것이 필요하며, 전력공급자와 소비자 사이의 양방향 전력 및 정보의 실시간 교환 특성을 활용하여 에너지를 효율적으로 사용하도록 하는 시스템의 도입이 무엇보다 중요하다. 2011년 9/15 순환정전 사태는 전력공급 정책과 더불어 전력 소비자에 대한 관리 기능도 함께 검토되어야 한다는 것을 다시 한 번 크게 인식할 수 있는 계기가 되었다. 본 고에서는 이러한 중요성을 가지는 소비자 분야를 중심으로 한 스마트그리드 ICT 기술에 대하여 일부 주요 사항을 발췌하여 정리해 보고자 한다. 이를 위하여 스마트그리드의 전체적인 현황, 소비자 도메인에서의 스마트그리드 요소기술 및 ICT 기술의 핵심이 되는 소비자 도메인에서 사용되는 통신 기술을 중심으로 소비자 도메인 ICT 기술에 대하여 정리해 보고자 한다.

• Journal of the Korea Society of Computer and Information
• /
• v.11 no.4 s.42
• /
• pp.165-174
• /
• 2006

As context aware service supports a process of context acquisition and reasoning, there are many studies to facilitate the implementation of context aware service. However, these studies have not supported efficiently a user or service mobility that should be supported necessarily in ubiquitous computing environment. Therefore, this study proposes a dynamic context aware service model which supports a dynamic management of context information, service retrieval and composition for interactions between services, and service mobility. Then we design a middleware based on this model and implement the middleware. As the middleware is implemented on the OSGi framework. it can have an interoperability between the devices such as computers, PDA, home appliances, and sensors, because of using the standard interface technologies like UPnP. Jini and so on.

• Korean Journal of Construction Engineering and Management
• /
• v.23 no.2
• /
• pp.33-44
• /
• 2022

The simulation function by the 4D system is a representative BIM function in the construction stage. For the 4D simulation, schedule information for each activity must be created and then linked with the 3D model. Since the 3D model created in the design stage does not consider schedule information, there are practical difficulties in the process of creating schedule information for application to the construction stage and linking the 3D model. In this study, after extracting the schedule information of the construction stage using the HDBSCAN algorithm from the 3D model in the design stage, authors propose a methodology for automatically generating schedule information by identifying precedence and sequencing relationships by applying the topological alignment algorithm. Since the generated schedule information is created based on the 3D model, it can be used as information that is automatically linked by the common parameters between the schedule and the 3D model in the 4D system, and the practical utility of the 4D system can be increased. The proposed methodology was applied to the four bridge projects to confirm the schedule information generation, and applied to the 4D system to confirm the simplification of the link process between schedule and 3D model.

• Journal of the Daesoon Academy of Sciences
• /
• v.28
• /
• pp.37-72
• /
• 2017

The purpose of this article is to study the prospect of implementing a public common practice of ethics based on the 'Reordering Works of Heaven and Earth.' The 'Reordering Works of Heaven and Earth' demonstrated the prospect of a public common practice of ethics through the shared public action that would connect and mediate both the public domain and the private domain. In addition, the 'Reordering Works of Heaven and Earth' of Gucheon Sangje (九天上帝) provided us with a complete transformation, meaning the opening of a new era, transforming heaven and earth from their state in the Prior World to their optimized state in the Later World. This culminates in a new manifestation of a peaceful world revealed a prosperity and the prospect of common happiness and common order for the public. In addition, the 'Reordering Works of Heaven and Earth' has a public value as a religious culture that responds to social change and social needs. The 'Reordering Works of Heaven and Earth' revealed the prospect of a public common practice of ethics, placed importance on creating a new foundation, and restoring phenomena back to its original order. The 'Reordering Works of Heaven and Earth' presented various multi-faceted, multi-layered outlets of soteriology while exploring solutions to public issues and revealing human dignity. Through the new construction of Heaven and Earth, Gucheon Sangje had intervened in projects for human relief. The public ethical indicators of 'the actor' here are in line with those of the 'Non-action Tao' of Laozi. As the cosmos enters into the new epoch, humans have living together with the previous cosmic principle. Now we can expect the Prior World to open into a different era as humans embrace a cosmic life of 'Non-action Tao.' The active conjunction of the virtues of yin and yang is an idea of horizontal communication related to reordering of the universe. The harmonious union of divine beings and human beings suggests the way of enabling vertical communication. The resolution of grievances for the mutual beneficence of life is an ethics of peace that aims at achieving coexistence and prosperity. The private realization of Tao and the completion of the Tao in the world suggest the prospect of a common practice of ethics as means of implementing human dignity.

• Journal of Digital Convergence
• /
• v.12 no.11
• /
• pp.357-364
• /
• 2014

AR contents, if markers to be tracked move fast, show flickering while updating images captured from cameras. Conventional methods employing image based markers and SLAM algorithms for tracking objects have the problem that they do not allow more than 2 objects to be tracked simultaneously and interacted with each other in the same camera scene. In this paper, an improved SLAM type algorithm for tracking dynamic objects is proposed and investigated to solve the problem described above. To this end, method using 2 virtual cameras for one physical camera is adopted, which makes the tracked 2 objects interacted with each other. This becomes possible because 2 objects are perceived separately by single physical camera. Mobile robots used as dynamic objects are synchronized with virtual robots in the well-designed contents, proving usefulness of applying the result of individual tracking for multiple moving objects to augmented visualization of objects.

• Journal of the Korea Society for Simulation
• /
• v.19 no.4
• /
• pp.291-299
• /
• 2010

As recent advances in science, technology and performance requirements of the weapons system are getting highly diversified and complex, the performance requirements also get stringent and strict. Moreover, the weapons system should be intimately connected with other systems such as watchdog system, command and control system, C4I system, etc. However, a tremendous amount of time, cost and risk being spent to acquire new weapons system, and not being diminished compared to the rapid pace of its development speed. Defense Modeling and Simulation(M&S) comes into the spotlight as an alternative to overcoming these difficulties as well as constraints. In this paper, we propose the development process of virtual test framework based on the synthetic environment as a tool to analyze the effectiveness of the weapons system of underwater engagement model. To prove the proposed concept, we develop the test-bed of virtual test using Delta3D simulation engine, which is open source S/W. We also design the High Level Architecture and Real-time Infrastructure(HLA/RTI) based Federation for the interoperation with heterogeneous simulators. The significance of the study entails (1)the rapid and easy development of simulation tools that are customized for the Korean Theater of War; (2)the federation of environmental entities and the moving equations of the combat entities to manifest a realistic simulation.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.46 no.6
• /
• pp.66-77
• /
• 2009

In this paper, we propose a CORBA middleware extension which is suitable to SCA based communication environment. The extensions guarantee the components to interconnect others without consideration about its implementation way and enables the developers to easily achieve the performance improvements in comparison to the existing methodology. This extension includes the HAO, the IDL2VHDL compiler, and the improvement of ORBit. The HAO is ORB implemented in logic level and is limited the some function according to the characteristic of FPGA. In addition, the IDL2VHDL compiler provides the mapping from CORBA IDL to VHDL, the VHSIC hardware description language, and the additional procedures for processing the component. Finally, the improved ORBit, CORBA ORB on GPP, can be direct connecting with the HAO on FPGA.