Power-Flow Simulator with Visualization Function Based on IEEE Common Data Format

Sugino, Shohei,Sekiya, Hiroo Korea Multimedia Society 2016 The journal of multimedia information system Vol.3 No.4

In this paper, a power flow simulator, which visualizes power flow and system configuration, is proposed and implemented. Generally, it is necessary to prepare a text file with power-system descriptions, which is one of the barriers for power-flow simulations. The proposed simulator has a function of automatic generations of IEEE common data format files from user-drawn power-system diagrams. Therefore, it is possible for users to carry out simulations only by drawing power system on display. In addition, the proposed simulator also has a function that power-system diagram is illustrated automatically from an IEEE common data format file. By using this function, it is possible to visualize amounts and directions of power flows on the bus-system diagram, which helps users to comprehend network dynamics intuitively. Because the proposed simulator allows including renewable-resource generators in power systems, it is useful to evaluate the power distribution system. It is shown in this paper that the proposed simulator can make IEEE common data format files correctly and illustrate intuitive power flow.

Multiple-Packet Reception MAC Protocol Applying Pulse/Tone Exchange in MIMO Ad-Hoc Networks

Yoshida, Yuto,Komuro, Nobuyoshi,Ma, Jing,Sekiya, Hiroo Korea Multimedia Society 2016 The journal of multimedia information system Vol.3 No.4

This paper proposes a medium access control (MAC) protocol for multiple-input multiple-output (MIMO) ad-hoc networks. Multiple-packet receptions in MIMO systems have attracted as a key technique to achieve a high transmission rate. In the conventional protocols for multiple-packet receptions, timing offsets among multiple-frame transmissions cause frame collisions induced by hidden nodes, which degrades network performance. In the proposed protocol, transmission synchronization among hidden nodes can be achieved by applying pulse/tone exchanges. By applying the pulse/tone exchanges, multiple-packet receptions among hidden nodes can be achieved, which enhances network throughputs compared with the conventional protocol. Simulation results show effectiveness of the proposed protocol.

APMD: A fast data transmission protocol with reliability guarantee for pervasive sensing data communication

Liu, Yuxin,Liu, Anfeng,Li, Yuxuan,Li, Zhetao,Choi, Young-june,Sekiya, Hiroo,Li, Jie Elsevier 2017 Pervasive and mobile computing Vol.41 No.-

<P><B>Abstract</B></P> <P>In pervasive sensing data communication systems, it is significant to ensure data reliably and rapidly sent to the control center. Otherwise, laggard data transmission may result in vital loss. An adaptive persistent m data (APMD) transmission protocol is proposed to reduce delay with reliability guarantee for pervasive sensing data communication systems. In APMD transmission protocol, each data packet is sent for m ( m ≥ 1 ) times by sender at the first time of transmission. If the data packet cannot be received successfully for m times, sender will transmit this data packet again and wait for ACK sent back by receiver in the send and wait way. The next data packet will not be sent until this packet is sent successfully or the time of transmission reaches the maximum limit. The option of appropriate value of m is based on the energy situation, which guarantees high network lifetime. Both theoretical analysis and experimental simulation results indicate that the APMD protocol is better than the previous data transmission protocol. The delay can be reduced by 12.73%–14.78%, the energy utilization rate can be improved by about 35% compared to the SW-ARQ protocol, while the reliability increases slightly and the lifetime has no difference.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A fast data transmission protocol is proposed for pervasive sensing. </LI> <LI> The high reliability can be guaranteed in our protocol. </LI> <LI> The delay can be reduced by 12.73%–14.78% compare to previous studies in our protocol. </LI> <LI> The energy utilization can be enhanced by 35%. </LI> </UL> </P>

Alternative Multiplicative Iterative Method for Projection Matrix Design in Compressive Images

Tian Shujuan,Fan Xiaoping,Xie Jingxiong,Li Zhetao,Choi Youngjune,Sekiya Hiroo 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.9

A throughput aware with collision-free MAC for wireless LANs

Pei, Tingrui,Deng, Yafeng,Li, Zhetao,Zhu, Gengming,Pan, Gaofeng,Choi, Youngjune,Sekiya, Hiroo Springer Science + Business Media 2016 Science China. Information sciences Vol.59 No.2

A Trust-Based Model for Security Cooperating in Vehicular Cloud Computing

Tang, Zhipeng,Liu, Anfeng,Li, Zhetao,Choi, Young-june,Sekiya, Hiroo,Li, Jie Hindawi Limited 2016 Mobile information systems Vol.2016 No.-

<P>VCC is a computing paradigm which consists of vehicles cooperating with each other to realize a lot of practical applications, such as delivering packages. Security cooperation is a fundamental research topic in Vehicular Cloud Computing (VCC). Because of the existence of malicious vehicles, the security cooperation has become a challenging issue in VCC. In this paper, a trust-based model for security cooperating, named DBTEC, is proposed to promote vehicles’ security cooperation in VCC. DBTEC combines the indirect trust estimation in Public board and the direct trust estimation in Private board to compute the trust value of vehicles when choosing cooperative partners; a trustworthy cooperation path generating scheme is proposed to ensure the safety of cooperation and increase the cooperation completion rates in VCC. Extensive experiments show that our scheme improves the overall cooperation completion rates by 6~7%.</P>

Generalized analytical expressions for end-to-end throughput of IEEE 802.11 string-topology multi-hop networks

Sanada, Kosuke,Komuro, Nobuyoshi,Li, Zhetao,Pei, Tingrui,Choi, Young-June,Sekiya, Hiroo Elsevier 2018 AD HOC NETWORKS Vol.70 No.-

<P><B>Abstract</B></P> <P>It is an effective approach for comprehending network performance is to develop a mathematical model because complex relationship between system parameters and performance can be obtained explicitly. This paper presents generalized analytical expressions for end-to-end throughput of IEEE 802.11 string-topology multi-hop networks. For obtaining expressions, a relationship between the durations of the backoff-timer (BT) decrements and frame transmission is expressed by integrating modified Bianchi’s Markov-chain model and airtime expression. Additionally, the buffer queueing of each node is expressed by applying the queueing theory. The analytical expressions obtained in this paper provide end-to-end throughput for any hop number, any frame length, and any offered load, including most of analytical expressions presented in previous papers. The analytical results agree with simulation results quantitatively, which shows the verifications of the analytical expressions.</P>

Energy-Efficient Broadcasting Scheme for Smart Industrial Wireless Sensor Networks

Chen, Zhuangbin,Liu, Anfeng,Li, Zhetao,Choi, Young-June,Sekiya, Hiroo,Li, Jie Hindawi Limited 2017 Mobile information systems Vol.2017 No.-

<P>In smart Industrial Wireless Sensor Networks (IWSNs), sensor nodes usually adopt a programmable technology. These smart devices can obtain new or special functions by reprogramming: they upgrade their soft systems through receiving new version of program codes. If sensor nodes need to be upgraded, the sink node will propagate program code packets to them through “one-to-many” broadcasting, and therefore new capabilities can be obtained, forming the so-called Software Defined Network (SDN). However, due to the high volume of code packet, the constraint energy of sensor node, and the unreliable link quality of wireless network, rapidly broadcasting the code packets to all nodes in network can be a challenge issue. In this paper, a novel Energy-efficient Broadcast scheme with adjustable broadcasting radius is proposed aiming to improve the performance of network upgrade. In our scheme, the nonhotspots sensor nodes take full advantage of their residual energy caused in data collection period to improve the packet reception probability and reduce the broadcasting delay of code packet transmission by enlarging the broadcasting radius, that is, the transmitting power. The theoretical analyses and experimental results show that, compared with previous work, our approach can averagely reduce the Network Upgrade Delay (NUD) by 14.8%-45.2% and simultaneously increase the reliability without harming the lifetime of network.</P>

Distributed cooperative communication nodes control and optimization reliability for resource-constrained WSNs

Liu, Xiao,Liu, Anfeng,Li, Zhetao,Tian, Shujuan,Choi, Young-june,Sekiya, Hiroo,Li, Jie Elsevier 2017 Neurocomputing Vol.270 No.-

<P><B>Abstract</B></P> <P>The utilization of distributed control and optimization is still a challenge issue to achieve reliable communication for resource-constrained networked systems. In this paper, a distributed cooperative communication nodes control (DCCNC) approach is proposed to achieve higher reliability communication and longer network lifetime for resource-constrained wireless sensor network (WSNs). A DCCNC scheme adopts feedback control approach to determine the appropriate number of node which participates in cooperative communication according to the application reliability requirements. A residue energy notification mechanism is used to notice the minimum residual energy of nodes in a network, then the number of cooperative communication nodes is adjusted according to the difference between the residual energy of nodes and the minimum residual energy of network. In a DCCNC scheme, larger number of participate cooperative communication nodes are adopted in non-hotspots area to achieve high reliability, while less number of participate cooperative communication nodes are adopted in hotspots area to achieve high network lifetime. The theoretical analysis and experimental results show that comparing with previous communications schemes, DCCNC scheme can reduce end to end Data Fail delivering Ratio (DFR) by 57.16–93.29% while retaining network lifetime, and DCCNC approach can also improves lifetime by 3.89–18.75% while retaining weighted end to end (DFR).</P>

Orthogonal-Gradient Measurement Matrix Construction Algorithm

Pan, Tian,Choi, Youngjune,Tian, Shujuan,Fan, Xiaoping,Li, Zhetao,Sekiya, Hiroo Institution of Electrical Engineers 2016 Chinese journal of electronics Vol.25 No.1

<P>An orthogonal-gradient measurement matrix construction algorithm is proposed for reducing the maximum and average mutual-coherence of sensing matrix. It shrinks Gram matrix based on equiangular tight frame theory. An orthogonal-gradient factor matrix is deduced. It obtains an optimized measurement matrix with the orthogonal-gradient factor matrix. The results of experiments show that the proposed algorithm effectively reduces the maximum and average mutual-coherence of sensing matrix. This leads to a better reconstruction performance for signals with different sparsities compared with Gaussian matrix, Elad's, Xu's, Vahid's and Li's methods.</P>