• International Journal of Computer Science & Network Security
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• 제22권9호
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• pp.376-388
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• 2022

The expansion of new applications and business models is being significantly fueled by the development of Fifth Generation (5G) networks, which are becoming more widely accessible. The creation of the newest intelligent vehicular networks and applications is made possible by the use of Vehicular Ad hoc Networks (VANETs) and Software Defined Networking (SDN). Researchers have been concentrating on the integration of SDN and VANET in recent years, and they have examined a variety of issues connected to the architecture, the advantages of software-defined VANET services, and the new features that can be added to them. However, the overall architecture's security and robustness are still in doubt and have received little attention. Furthermore, new security threats and vulnerabilities are brought about by the deployment and integration of novel entities and a number of architectural components. In this study, we comprehensively examine the good and negative effects of the most recent SDN-enabled vehicular network topologies, focusing on security and privacy. We examine various security flaws and attacks based on the existing SDVN architecture. Finally, a thorough discussion of the unresolved concerns and potential future study directions is provided.

• International Journal of Computer Science & Network Security
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• 제22권9호
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• pp.231-243
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• 2022

The expansion of new applications and business models is being significantly fueled by the development of Fifth Generation (5G) networks, which are becoming more widely accessible. The creation of the newest intelligent vehicular net- works and applications is made possible by the use of Vehicular Ad hoc Networks (VANETs) and Software Defined Networking (SDN). Researchers have been concentrating on the integration of SDN and VANET in recent years, and they have examined a variety of issues connected to the architecture, the advantages of software defined VANET services, and the new features that can be added to them. However, the overall architecture's security and robustness are still in doubt and have received little attention. Furthermore, new security threats and vulnerabilities are brought about by the deployment and integration of novel entities and several architectural components. In this study, we comprehensively examine the good and negative effects of the most recent SDN-enabled vehicular network topologies, focusing on security and privacy. We examine various security flaws and attacks based on the existing SDVN architecture. Finally, a thorough discussion of the unresolved concerns and potential future study directions is provided.

• 한국통신학회논문지
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• 제39B권6호
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• pp.406-413
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• 2014

최근 몇 년 사이 인터넷을 통해 접속 가능한 디바이스가 다양해지는 한편 디바이스가 콘텐츠의 사용자가 아닌 제공자가 되면서 콘텐츠 트래픽이 급속하게 증가하고 있다. 이와 같은 콘텐츠 트래픽이 기존과는 다른 패턴을 갖기 때문에, 효율적인 콘텐츠 전송 서비스를 위한 다양한 연구가 진행 중이다. 대표적 콘텐츠 전송 서비스 기술인 CCN(Contents Centric Network)은 기존의 기술 구조와 상이한 혁신적인 구조를 갖고 있기 때문에 기존의 네트워크와의 호환 문제가 발생한다. 이와 같은 문제를 해결하기 위해 본 논문에서는 CCN과 기존 망과의 연동 시 효율적 콘텐츠 전송을 위한 SaNA(Software adaptive Network Architecture) 구조를 제안한다. 이는 미래 인터넷의 핵심 기술 분야인 CCN 과 소프트웨어 정의 네트워킹 기술(Software Defined Networking : SDN) 을 활용하여 기존 망에 점진적으로 적용해 나가기 위한 융합 시스템이다. SaNA를 통해 콘텐츠를 서비스하는 경우, 기존 네트워크 대비 네트워크 대역폭 효율성을 두 배로 높일 수 있고, 콘텐츠 전송 시간도 약 1.7 배 단축시킬 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권11호
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• pp.5243-5263
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• 2017

Data center networks provide critical bandwidth for the continuous growth of cloud computing, multimedia storage, data analysis and other businesses. The problem of low link bandwidth utilization in data center network is gradually addressed in more hot fields. However, the current scheduling strategies applied in data center network do not adapt to the real-time dynamic change of the traffic in the network. Thus, they fail to distribute resources due to the lack of intelligent management. In this paper, we present an improved adaptive traffic scheduling strategy utilizing the simulated annealing genetic algorithm (SAGA). Inspired by the idea of software defined network, when a flow arrives, our strategy changes the bandwidth demand dynamically to filter out the flow. Then, SAGA distributes the path for the flow by considering the scheduling of the different pods as well as the same pod. It is implemented through software defined network technology. Simulation results show that the bisection bandwidth of our strategy is higher than state-of-the-art mechanisms.

• ETRI Journal
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• 제42권2호
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• pp.186-195
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• 2020

Software-defined networking (SDN) acts as a centralized management unit, especially in a network with devices that operate under the transport layer of the OSI model. However, when a network with layer 7 middleboxes (MBs) is considered, current SDNs exhibit limitations. As such, to achieve a real-centralized management unit, a new architecture is required that decouples the data and control planes of all network devices. In this report, we propose such a complementary architecture to the current SDN in which SDN-enabled MBs are included along with contemporary SDN-enabled switches. The management unit of this architecture improves network performance and reduces routing cost by considering the status of the MBs during flow forwarding. This unit consists of the following two parts: an SDN controller (SDNC) and a middlebox controller (MBC). The latter selects the best MBs for each flow and the former determines the best path according to its routing algorithm and provides information via the MBC. The results show that the proposed architecture improved performance because the utilization of all network devices including MBs is manageable.

• 전기학회논문지
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• 제66권9호
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• pp.1379-1384
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• 2017

To guarantee safety and reliability, RAMS(Reliability Availability Maintainability and Safety) activity for a communication software in train communication network is studied. In this paper, preliminary hazard analysis in RAMS activities is studied for the communication software. Preliminary hazard analysis is done through library for communication software that the specification is defined by IEC 61375. The hazards are defined, then causes and consequence for each hazard are defined. The total 36 preliminary hazards are classified. For high severity hazards are changed to acceptable level by upgrading of system requirement specification.

• 한국융합학회논문지
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• 제9권12호
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• pp.61-68
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• 2018

스마트폰과 모바일 환경이 발전하면서 개인의 업무 수행을 위한 시간과 공간의 제약이 사라지고 있다. 기업은 클라우드 컴퓨팅을 통하여 비용을 절감하고 사업의 범위를 빠르게 확대할 수 있게 되었다. 다양한 클라우드의 사용이 확대되면서 사용자, 데이터, 어플리케이션의 경계가 사라지고 있다. 경계(Perimeter)을 기준으로 하는 전통적인 보안 접근은 클라우드 환경에서 효용을 잃어가고 있다. 이에, 본 논문에서는 클라우드 환경에서 기존 Network Access Control(NAC)의 한계를 기술하고 이를 보완한 네트워크 보안 기술을 제안한다. 관련연구로 SDP에 대해서 설명하고, NAC의 한계를 극복하기 위해 SDP(Software Defined Perimeter)를 융합하고 동시에 클라우드 환경의 지원을 위한 새로운 프레임워크로의 역할을 설명한다. 본 논문에서 제안한 새로운 프레임워크는 물리적인 부분과 소프트웨어적인 부분에 SDP 기술을 적용하여 IP 기반이 아닌 신원 중심 접근제어 제공, 암호화된 세그먼트 관리, 동적정책관리 등을 지원하는 소프트웨어 기반의 네트워크 보안 솔루션을 제안한다.

• 한국정보통신학회논문지
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• 제20권3호
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• pp.491-498
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• 2016

소프트웨어 정의 네트워크는 네트워크 제어 기능을 데이터 전송 기능으로부터 물리적으로 분리하여 소프트웨어적으로 구현한다. 광범위한 지역으로 소프트웨어 정의 네트워크를 설치하기 위해서는 다중의 제어기가 요구되며, 제어기의 배치는 소프트웨어 정의 네트워크 성능에 중요한 영향을 미친다. 본 논문에서는 소프트웨어 정의 네트워크에서 효율적인 제어기 배치를 위한 메타 휴리스틱 알고리즘인 타부 서치 알고리즘을 제안한다. 보다 좋은 결과를 효과적으로 얻기 위해 새로운 타부 서치의 이웃해 생성 방식을 제안한다. 제안된 알고리즘은 소프트웨어 정의 네트워크에서 최소 전송지연과 실행속도 관점에서 성능을 평가하며, 유전 알고리즘 및 랜덤방법과 비교하여 제안된 알고리즘의 성능이 우수함을 보인다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제10권5호
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• pp.400-407
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• 2005

Reverse engineering is defined as the process where the internal structures and dynamics of a given system are inferred and analyzed from external observations and relevant knowledge. The first part of this paper surveys existing techniques for biosystem reverse engineering. Network structure inference techniques such as Correlation Matrix Construction (CMC), Boolean network and Bayesian network-based methods are explained. After the numeric and logical simulation techniques are briefly described, several representative working software tools were introduced. The second part presents our component-based software architecture for biosystem reverse engineering. After three design principles are established, a loosely coupled federation architecture consisting of 11 autonomous components is proposed along with their respective functions.

• International Journal of Computer Science & Network Security
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• 제22권10호
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• pp.303-309
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• 2022

Software Defined Networking (SDN) is a novel approach that have accelerated the development of numerous technologies such as policy-based access control, network virtualization, and others. It allows to boost network architectural flexibility and expedite the return on investment. However, this increases the system's complexity, necessitating the expenditure of dollars to assure the system's security. Network Function Virtualization (NFV) opens up new possibilities for network engineers, but it also raises security concerns. A number of Internet service providers and network equipment manufacturers are grappling with the difficulty of developing and characterizing NFVs and related technologies. Through Moodle's efforts to maintain security, this paper presents a detailed review of security-related challenges in software-defined networks and network virtualization services.