• The KIPS Transactions:PartC
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• v.10C no.6
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• pp.727-738
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• 2003

Much research efforts are being exerted for the study of intrusion detection system(IDS). However little work has been for the communication medels and performance eveluation of the IDS. Here we present a communication framework for doing hybrid intrusion detection in which agents are used for local intrusion detections with a centralized data anaysis componenta for a global intrusion detection at multiple domains environment. We also assume the combination of host-based and network-based intrusion detection systems in the oberall framework. From the local domain, a set of information such as alert, and / or log data are reported to the upper level. At the root of the hierarchy, there is a global manager where data coalescing is performed. The global manager delivers a security policy to its lower levels as the result of aggregation and correlation of intrusion detection alerts. In this paper, we model the communication mechanisms for the hybrid IDS and develop a simular using OPNET modeller for the performance evaluation of transmission capabillities for the delivery of data and policy. We present and compare simulation results based on several scenarios focuding on communication delay.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2005.11a
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• pp.453-460
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• 2005

P2P(Peer to Peer) 기술은 잠재적 능력에도 불구하고 컨텐츠의 저작권문제와 보안문제 등으로 인하여 많은 사람들이 충분히 활용하지 못하고 있다. 본 연구는 인터넷 사용자(개인)와 소규모 서버를 운영하는 조직들이 정보 제공, 분배, 공유의 정보시스템 구조를 자신들의 목적에 맞게 자유롭게 만들 수 있는 프레임워크인 오픈웨어 (Openware)의 개발에 관한 것이다. 오픈웨어는 P2P기반 시스템으로 다음과 같은 특징올 갖는다. 1) 다수의 서버와 클라이언트로 이루어지는 구조로, 사용자의 목적에 맞게 집중형 혹은 분산형 구조를 자유롭게 혼합하여 정보시스템을 구성 할 수 있다. 이러한 정보 구조의 유연성은 다양한 형태의 협업(개인과 개인, 개인과 그룹, 그룹과 그룹)이 요구되는 응용 시스템의 기반을 제공한다. 2) 데이터 관점에서 오픈웨어는 개인이 데이터베이스를 손쉽게 생성, 관리 할 수 있고, 자신의, 데이터 혹은 데이터베이스 구조를 다른 사람이나 그룹과 공유 하거나 통합 할 수 있다. 3) 데이터 통신면에서 오픈웨어는 HTTP(HyperText Transfer Protocol) 프로토콜만을 사용하는 웹 기반 시스템으로 인터넷에 연결 되어있는 누구와도 오픈웨어를 통해 협업이 가능하다. 4) 소프트웨어 이름에서 알 수 있듯이 오픈웨어는 Java, JSP, Apache, Resin등 공개소프트어로 만들어져 있고, 오픈웨어 자체도 공개소프트웨어이다. 오픈웨어는 개인과 그룹의 흠페이지 생성과 관리, 파일 공유 기능이 구현 되어있고, 데이터베이스 공유, 통합 기능을 이용하여 개인이나 그룹의 주소록관리, 일정관리 등이 가능하다. 오픈웨어는 사용자 흑은 개발자가 다양한 형태의 응용컴포넌트를 자유롭게 등록하여 기능을 추가 할 수 있는 확장성올 제공하고 있어서, 앞으로 e-메일, 매신저, 전자결재, 지식관리시스템, 인터넷 방송 시스템의 기반 구조 역할을 할 수 있다. 현재 오픈웨어에 적용하기 위한 P2P 기반의 지능형 BPM(Business Process Management)에 관한 연구와 X인터넷 기술을 이용한 RIA (Rich Internet Application) 기반 웹인터페이스 연구를 진행하고 있다.

• Journal of KIISE:Software and Applications
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• v.31 no.11
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• pp.1439-1454
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• 2004

Recently, Levels of Information Systems Interoperability (LISI) that are used for assessing the information systems interoperability are defined according to the importance of interoperability among information systems. At that time, it is necessary to the construction of an assessment information repository to store and retrieve the interoperability assessment data efficiently. An LISI repository constructed for storing and retrieving an assessment information should support assessment systems that are developed in various Platforms and provide its functions by a standardized way. Business logics of LISI repository should be developed as distributed components, and we need to modify existing software design methods to show characteristics of LISI repository in addition to the standardized LISI data expression. Also a concrete method to recognize various implementation technologies and to apply them to implementation of LISI repository is needed. This paper provides a design method for developing an LISI repository that is considering the characteristics of LISI repository by three concerns, and an implementation scheme that can apply to the integration of the various repository implementation technologies systematically, as the LISI repository development framework for constructing the LISI repository. These help developers to construct the LISI repository effectively by providing concrete guidelines for considerations and appliable methods to construct the LISI repository.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.10
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• pp.64-75
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• 2007

Service discovery protocols is software components to find specific services or resources on network. The SLP defined by IETF protocol is a framework for automatic service discovery on IP based networks. Automatic service discovery is an important component on ubiquitous computing environment. This paper proposes a service discovery architecture named as SLPA(Service Location Protocol based on AMAAM). AMAAM(Mobility Agent Advertisement Mechanism) is an aggregation-based Mobile IP implementation in MANET. In SLPA, the role of the directory agent is assigned to the mobility agent in AMAAM. The mobility agent periodically beacons an advertisement message which contains both the advertisement of the directory agent in SLP and the advertisement of the mobility agent in Mobile IP. For evaluating the functional correctness of SLPA and the overhead of maintaining a service directory of SLPA. We simulate SLPA using ns-2 and analyze the overhead of control overheads for the aggregation. Through the simulation experiments we show the functional correctness of the proposed architecture and analyze the performance results.

• KIPS Transactions on Computer and Communication Systems
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• v.7 no.3
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• pp.81-90
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• 2018

Due to the dramatic advancement of IoT (Internet of Things), it is expected that tens of billions of IoT devices will be connected by the year 2024. Furthermore, as IoT technologies evolves, the security management in IoT platforms has become a critical issue. For example, there are interworking problems between heterogeneous IoT platforms caused by differences from communication protocols, security policies, etc. in each platform. In addition, unsecured interworking can cause major security issues including the information leakage. In this paper, in order to solve these problems, a security interworking architecture is proposed and implemented in both FIWARE and oneM2M, which are representative IoT platforms. First, the security architecture of FIWARE is analyzed and implemented, and then the security framework based on OAuth 2.0 is developed on Mobius platform. Finally, in order to validate the proposed security interworking architecture, a LED (Light-Emitting Diode) example, where the LED is controlled by only authorized users, is developed. The proposed architecture can be extended to the diverse IoT platforms and devices.

• The KIPS Transactions:PartB
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• v.9B no.2
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• pp.215-222
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• 2002

This paper presents a reliable fully automatic labeling system which fits well with languages having well-developed syllables such as in Korean. The ASL System utilize DAC (Divide and Conquer), a control mechanism, based segmentation algorithm to use phonetic and acoustic information with greater efficiency. The segmentation algorithm is to devide speech signals into speechlets which is localized speech signal pieces and to segment each speechlet for speech boundaries. While HMM method has uniform and definite efficiencies, the suggested method gives framework to steadily develope and improve specified acoustic knowledges as a component. Without using statistical method such as HMM, this new method use only phonetic-acoustic information. Therefore, this method has high speed performance, is consistent extending the specific acoustic knowledge component, and can be applied in efficient way. we show experiment result to verify suggested method at the end.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.823-826
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• 2012

In this paper, we propose an efficient network virtualization model in cloud computing environments. Virtualization is a key technology for the implementation of service-oriented architecture. It is a standardized framework that can be reused or integrated with changing business priorities through a IT infrastructure. Network virtualization has emerged as an important technical issues of the future virtualization technology in Internet. The concept of network virtualization and related technologies stay in ambiguous status since network virtualization is in its early stage. Thus, we propose a network virtualization model for cloud environment by analyzing the existing network virtualization technologies.

• Journal of Korea Society of Industrial Information Systems
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• v.7 no.3
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• pp.15-22
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• 2002

As the size and complexity of software systems increase, the design and specification of overall system structure become more significant issues than the choice of algorithms and data structures of computation. Software architecture serves as a framework for understanding system components and their interrelationships. Software architectures can be reusable assets to achieve low costs, high productivity, and consistent quality. We have developed a software architecture design environment, called Happy Work. In this paper, we would like to present the structure and functions of Happy Work. Happy Work has two main functions. First, it Provides a graphic editor for modeling of software architecture diagram. Second it provides an ADL, called HWL(Happy Work language). HWL is a language that describes software architect

• Journal of KIISE:Software and Applications
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• v.29 no.12
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• pp.895-906
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• 2002

Due to increased concern about the distributed web application, the interest in EJB - server-side Java component architecture that enables to make out Business Logic without writing codes related to complicated distributed framework - is also increasing. Despite of these increased interest, However, efforts for reliability of these systems have been insufficient. Thus, in this paper, we propose specification technique for applying DbC approach, which can elevate the reliability of software in the Object-Oriented system development, in writing formal specification of EJB-based application. Through this specification technique, developers can gain reliability in the EJB-based application development.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06d
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• pp.208-212
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• 2008

인터넷이 발달함에 따라 인터넷 기반의 협업시스템을 이용하여 정보를 교환하고 협업을 수행하는 사용 자와 그룹이 급속히 증가하고 있다. 이러한 사용자들이 급속히 증가함에 따라 사용자들의 다양한 작업 환 경을 고려한 개인화된 협업서비스가 제공되는 것이 바람직하지만 현재의 협업시스템들은 이러한 서비스를 제공하지 않아서 효과적인 협업 환경을 제공하기 어렵다. 본 논문은 협업시스템을 이용하여 다양한 사용자들의 협업 수행을 지원하는 CoPortlet의 개발에 대하여 기술한다. CoPortlet 은 포탈에 포함되는 포틀릿 컴포넌트로서 협업시스템 서버에서 제공하는 다양한 가상 공간을 지원하며, 각 가상공간의 자원을 제어하는 기능들을 제공한다. CoPortlet은 Struts 프레임워크를 바탕으로 설계하였으며, WebDAV 프로토콜을 이용하여 협업시스템과 상호 동작한다. 사용자는 여러 포틀릿과 함께 CoPortlet으로 구성되는 포탈을 이용하여 자신의 작업 환경을 고려한 맞춤형 인터페이스를 구성하고 효과적으로 협업을 수행할 수 있다.