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RISS 인기검색어
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- 저자 : Paul S. Fisher (검색결과 6 건)
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Mining intelligent solution to compensate missing data context of medical IoT devices
Fisher, Paul S.,James II, Jimmy,Baek, Jinsuk,Kim, Cheonshik Springer-Verlag 2018 PERSONAL AND UBIQUITOUS COMPUTING Vol.22 No.1
<P>When gathering experimental data generated by medical IoT devices, the perennial problem is missing data due to recording instruments, errors introduced which cause data to be discarded, or the data is missed and lost. When faced with this problem, the researcher has several options: (1) insert what appears to be the best replacement for the missing element, (2) discard the entire instance, (3) use one of the algorithms that will consider the data and then suggest viable candidate values for replacement. We discuss the options and introduce another mining intelligent technique based upon Markov models.</P>
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( Jinsuk Baek ),( Paul S. Fisher ),( Mingyung Kwak ) 한국인터넷정보학회 2008 KSII Transactions on Internet and Information Syst Vol.2 No.1
In order to securely transmit multicast data packets in a mobile environment where frequent join/leave events are a characteristic of the environment, there is a need for a new secure and efficient group key management solution. We propose a secure group key generation/distribution solution providing scalability and reliability. Using this solution, when a mobile node, which is in a multicast session, enters a new domain, the agent of the domain joins the multicast session and coordinates its data packets with the mobile node. The agent encrypts and transmits subsequent data packets to the mobile node, using a local one-time pad key. This key is generated with FI sequences, enabling the mobile node to regenerate the same data packet, based on the information sent by the agent. Our performance analysis demonstrates that the proposed solution can significantly reduce the number of key generations and distributions, when it is applied to the hierarchical mobile IPv6 network.
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An Adaptive Primary Path Switching Scheme for Seamless mSCTP Handover
Jinsuk Baek,Doowon Kim,Paul S. Fisher,Minho Jo 한국산학기술학회 2011 SmartCR Vol.1 No.2
In this paper, a primary path switching scheme is proposed to provide a seamless handover for dual-homed mobile terminals. This scheme is proposed as an enhancement to the mSCTP protocol. With this scheme, a mobile terminal performs primary path switching before it becomes unavailable due to its primary path drop. The improvement achieved by the scheme is that it considers the temporal velocity of the mobile terminal with relative RTT variances of all available paths when it performs the handover process in the overlapped area between two different networks. Our simulation results show that the proposed scheme achieves a better overall performance than other schemes, and anticipatory switching is more important for faster moving terminals.
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Baek, Jin-Suk,Fisher, Paul S.,Kwak, Ming-Yung Korean Society for Internet Information 2008 KSII Transactions on Internet and Information Syst Vol.2 No.1
In order to securely transmit multicast data packets in a mobile environment where frequent join/leave events are a characteristic of the environment, there is a need for a new secure and efficient group key management solution. We propose a secure group key generation/distribution solution providing scalability and reliability. Using this solution, when a mobile node, which is in a multicast session, enters a new domain, the agent of the domain joins the multicast session and coordinates its data packets with the mobile node. The agent encrypts and transmits subsequent data packets to the mobile node, using a local one-time pad key. This key is generated with FI sequences, enabling the mobile node to regenerate the same data packet, based on the information sent by the agent. Our performance analysis demonstrates that the proposed solution can significantly reduce the number of key generations and distributions, when it is applied to the hierarchical mobile IPv6 network.
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A Hybrid Upstream Bandwidth Allocation Method for Multimedia Communications in EPONs
Baek, Jinsuk,Kwak, Min Gyung,Fisher, Paul S. The Institute of Electronics and Information Engin 2012 IEIE Transactions on Smart Processing & Computing Vol.1 No.1
The Ethernet Passive Optical Network (EPON) has been considered to be one of the most promising solutions for the implementation of the Fiber To The Home (FTTH) technology designed to ameliorate the "last mile" bandwidth bottleneck. In the EPON network, an efficient and fair bandwidth allocation is a very important issue, since multiple optical network units (ONUs) share a common upstream channel for packet transmission. To increase bandwidth utilization, an EPON system must provide a way to adaptively allocate the upstream bandwidth among multiple ONUs in accordance to their bandwidth demands and requirements. We present a new hybrid method that satisfies these requirements. The advantage of our method comes from the consideration of application-specific bandwidth allocation and the minimization of the idle bandwidth. Our simulation results show that our proposed method outperforms existing dynamic bandwidth allocation methods in terms of bandwidth utilization.
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A Smart Backoff Scheme for Multicast Flows in Wireless LAN
Jinsuk Baek,Min Gyung Kwak,Paul S. Fisher 한국산학기술학회 2015 SmartCR Vol.5 No.3
In IEEE 802.11 wireless protocols, a multicast sender basically adopts a simple broadcasting mechanism to transmit multicast frames. As such, the multicast frames are locally transmitted at a low, fixed rate without any backoff process on the sender’s side or any feedback requirements on the receiver side. This simplicity reveals an unfairly shared channel access between unreliable multicast flows and reliable unicast flows. In this paper, we propose a novel backoff scheme for multicast frame retransmission. The proposed scheme has been strategically designed after considering the sources of multicast frame errors. We define two different types of NAK messages that include a NAK for a single frame error and a cumulative NAK for multiple continuous erroneous frames. For frame retransmission, the multicast sender is required to adaptively adjust its contention window size based on the NAKs sent by its local receiver. With the proposed scheme, we ultimately provide reliable local multicast transmission and a relatively fair channel sharing with low-priority unicast flows.
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