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- 저자 : Penghao Sun (검색결과 4 건)
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An Optimized Deployment Mechanism for Virtual Middleboxes in NFV- and SDN-Enabling Network
( Gang Xiong ),( Penghao Sun ),( Yuxiang Hu ),( Julong Lan ),( Kan Li ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.8
Network Function Virtualization (NFV) and Software Defined Networking (SDN) are recently considered as very promising drivers of the evolution of existing middlebox services, which play intrinsic and fundamental roles in today`s networks. To address the virtual service deployment issues that caused by introducing NFV or SDN to networks, this paper proposes an optimal solution by combining quantum genetic algorithm with cooperative game theory. Specifically, we first state the concrete content of the service deployment problem and describe the system framework based on the architecture of SDN. Second, for the service location placement sub-problem, an integer linear programming model is built, which aims at minimizing the network transport delay by selecting suitable service locations, and then a heuristic solution is designed based on the improved quantum genetic algorithm. Third, for the service amount placement sub-problem, we apply the rigorous cooperative game-theoretic approach to build the mathematical model, and implement a distributed algorithm corresponding to Nash bargaining solution. Finally, experimental results show that our proposed method can calculate automatically the optimized placement locations, which reduces 30% of the average traffic delay compared to that of the random placement scheme. Meanwhile, the service amount placement approach can achieve the performance that the average metric values of satisfaction degree and fairness index reach above 90%. And evaluation results demonstrate that our proposed mechanism has a comprehensive advantage for network application.
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RETCAM: An Efficient TCAM Compression Model for Flow Table of OpenFlow
Chaoqin Zhang,Penghao Sun,Guangwu Hu,Liang Zhu 한국통신학회 2020 Journal of communications and networks Vol.22 No.6
OpenFlow is a widely adopted dataplane protocol insoftware-defined networking (SDN). However, the expansion ofsupported match fields in OpenFlow brings additional pressure tothe storage space of ternary content addressable memory (TCAM)in physical device, since the arbitrary wildcard support in thematch field of OpenFlow relies heavily on TCAM for looking-upspeed. In this paper, a mathematical model aiming at the storagespace reduction of the flow table in TCAM is presented, which isnamed as RETCAM. RETCAM analyzes the relationships amongall the match fields and then categorize the redundancy amongdifferent fields into three types. Based on the three redundancytypes, three compression algorithms named as inter-field merge,field mapping and intra-field compression are presented. The outcomes of each compression algorithm are flow entries with smallerbit-width which is sent to TCAM for flow matching. In this way, theflexibility of OpenFlow is not harmed, thus maintaining the function integrity of the original flow table. Simulation at the end showsthat RETCAM saves almost about 60% of TCAM space for a givenflow table with no damage to the function integrity of OpenFlow,and the compression performance stands stable with the increaseof flow table size.
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Yingying Zhang,Penghao Yu,Baorui Sun,Yi Zhou,Peijian Chen,Junhao Xu,Yushuai Zhao 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.2
This paper investigated the seismic performance of a typical “Integrated Station-Bridge high-speed railway station structure with a composite isolation system. The influential mechanism of the structure with isolation system was analyzed based on shaking table tests, mainly investigating on the failure mode, acceleration response and displacement response. Besides, a parameter optimization method of isolation layer for long-span structures was proposed based on genetic algorithm to better enhance the isolation performance of the large-span structure. The research revealed that there was no obvious damage to the composite isolation system under the PGA = 0.82 g. The nature frequency of the structure with isolation system is only 12.5% of that of non-isolation structure. The first three natural vibration frequency of the structure with isolation system only reduce 3.4%, 3.2%, 6.14% after the PGA = 1.27 g, that of the non-isolation structure reduce by more than 20%. The acceleration amplification factor of each layer of composite isolation system is less than 1, in particular, that of truss is about 0.3. The displacement response and acceleration response of the structure with isolation system have been reduced by about 90%. The proposed optimization method of isolation layer parameters provides an important reference for the isolation design for high-speed railway stations.
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Separating VNF and Network Control for Hardware-Acceleration of SDN/NFV Architecture
Tong Duan,Julong Lan,Yuxiang Hu,Penghao Sun 한국전자통신연구원 2017 ETRI Journal Vol.39 No.4
A hardware-acceleration architecture that separates virtual network functions (VNFs) and network control (called HSN) is proposed to solve the mismatch between the simple flow steering requirements and strong packet processing abilities of software-defined networking (SDN) forwarding elements (FEs) in SDN/network function virtualization (NFV) architecture, while improving the efficiency of NFV infrastructure and the performance of network-intensive functions. HSN makes full use of FEs and accelerates VNFs through two mechanisms: (1) separation of traffic steering and packet processing in the FEs; (2) separation of SDN and NFV control in the FEs. Our HSN prototype, built on NetFPGA-10G, demonstrates that the processing performance can be greatly improved with only a small modification of the traditional SDN/NFV architecture.
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