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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Korean Institute of Communications and Information Sciences
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The Korean Institute of Communications and Information Sciences
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Volume & Issues
Volume 39C, Issue 12 - Dec 2014
Volume 39B, Issue 12 - Dec 2014
Volume 39A, Issue 12 - Dec 2014
Volume 39C, Issue 11 - Nov 2014
Volume 39B, Issue 11 - Nov 2014
Volume 39A, Issue 11 - Nov 2014
Volume 39C, Issue 10 - Oct 2014
Volume 39B, Issue 10 - Oct 2014
Volume 39A, Issue 10 - Oct 2014
Volume 39C, Issue 9 - Sep 2014
Volume 39B, Issue 9 - Sep 2014
Volume 39A, Issue 9 - Sep 2014
Volume 39C, Issue 8 - Aug 2014
Volume 39B, Issue 8 - Aug 2014
Volume 39A, Issue 8 - Aug 2014
Volume 39C, Issue 7 - Jul 2014
Volume 39B, Issue 7 - Jul 2014
Volume 39A, Issue 7 - Jul 2014
Volume 39C, Issue 6 - Jun 2014
Volume 39B, Issue 6 - Jun 2014
Volume 39A, Issue 6 - Jun 2014
Volume 39C, Issue 5 - May 2014
Volume 39B, Issue 5 - May 2014
Volume 39A, Issue 5 - May 2014
Volume 39C, Issue 4 - Apr 2014
Volume 39B, Issue 4 - Apr 2014
Volume 39A, Issue 4 - Apr 2014
Volume 39C, Issue 3 - Mar 2014
Volume 39B, Issue 3 - Mar 2014
Volume 39A, Issue 3 - Mar 2014
Volume 39C, Issue 2 - Feb 2014
Volume 39B, Issue 2 - Feb 2014
Volume 39A, Issue 2 - Feb 2014
Volume 39C, Issue 1 - Jan 2014
Volume 39B, Issue 1 - Jan 2014
Volume 39A, Issue 1 - Jan 2014
Selecting the target year
Evaluation for Optimal HUD Location on a Train Using EEG
Wang, Chang-Won ; Kim, Yong-Kyu ; Min, Se-Dong ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 985~993
DOI : 10.7840/kics.2014.39C.11.985
This paper suggested a new evaluation method for optimal HUD position through a correlation based on between biological signal as and statistical analysis which using (Electroencephalogram, EEG) and ANOVA. This experiment was conducted two kinds of method to evaluate the optimal HUD position. At first, visual stimulus suggested from six different positions(the top and the bottom of the left, the top and the bottom of the center and the top and the bottom of the right on the screen) in laboratory and an object image was shown for 30 seconds in a screen which has
size. And second, HUD image was configured from three different positions and an object image was shown for 30 seconds in a screen. EEG, which used
-wave for evaluate an emotional stability, were measured from Fp1, Fp2, F7 and F8 channel based on ten to twenty electrode system. From the result in laboratory, F7
-wave was shown statistically significant to significance probability of 0.006 and between
-wave were showed a negative correlation(r
Effective Palm Print Authentication Guideline Image with Smart Phone
Lee, SangHo ; Kang, SungBea ; Nyang, DaeHun ; Lee, KungHee ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 994~999
DOI : 10.7840/kics.2014.39C.11.994
Nowadays we use biometrics such as face, fingerprint or palm print for registration and authentication with smart phone. When use camera function of smart phone, normally they overlay a specific image on camera preview as guideline and induce user to take picture uniformly. In this paper, use palm print for authentication factor with smart phone, we propose a new guideline and show the result about user experiment in terms of authentication success ratio.
On-Time Internal Pedestrian Localization Algorithm Based on Ad-Hoc Networks
Han, Ji-Yong ; Jang, Jae-Min ; Han, Junghee ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1000~1008
DOI : 10.7840/kics.2014.39C.11.1000
Situation awareness for vehicles and pedestrians is very critical to ensure safety. While on-board sensors or systems can easily detect line-of-sight pedestrians, it is difficult to locate the positions of out-of-sight pedestrians especially with no GPS service. This paper proposes a method for accurate and on-time localization of indoor pedestrians by nearby vehicles. The proposed method is based on mobile ad-hoc networks among vehicles and pedestrians, without relying on infrastructures such as GPS, WiFi AP, and Bluetooth-based systems. Also, this paper develops a genetic algorithm to accurately and promptly locate pedestrians. Finally, simulation results are presented to quantitatively evaluate the proposed method compared to other studies.
Aircraft Position Prediction and Shadow Zone Penetration Control Using Bezier Curve
Jeong, Jae-Soon ; Roh, Byeong-Hee ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1011~1022
DOI : 10.7840/kics.2014.39C.11.1011
Currently, the wireless network environment of air node is constructed mainly of ground relay station. However, as the Korean Peninsula is composed of 70% mountainous region, there are multiple shadow zones. This is calling for effective measures to prevent aircraft from losing communication link during low-mid altitude missions. In this article we propose the utilization of Bezier Curve for estimation of aircraft flight path and control method for entering shadow zone. This method successfully estimated aircraft track, and analyzed the existence, disseminated the warning, and took measures to avoid the shadow zone before entering. This article, suggested after simulated experiments, proves that the method enables seamless communication during air operations.
Performance Analysis of Beam Steering Algorithm According to the Signal Separation
Yun, Seonhui ; Oh, Jongchan ; Kim, Jun O ; Nam, Juhun ; Choi, Sangwook ; Ahn, Jaemin ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1023~1030
DOI : 10.7840/kics.2014.39C.11.1023
Beam steering algorithms using array antenna are mainly used in such a manner as anti-jamming method. However, the performance is changed according to the position of signals despite the same number of signals and the same received power. In this paper, we analyzed the effect of the position relationship of the signals on the performance of the beam steering algorithms. Therefore, we defined `signal separation` as the minimum angle of the interference signals and the desired signal, and analysed the relationship between the C/N0 performance of beam steering algorithms as LCMV/PM and the signal separation. For simulation, we set many GPS signals and jamming signals compared to the degrees of freedom. And changed the position and the height of the receiver in order to obtain various signal separation angles. In addition, we examined the effects of signal separation and JSR on the anti-jamming performance by applying the loss factors of the received power. Through the research, there is a tendency that the performance of beam steering algorithms is increased with the increase of the signal separation, and signal separation is more severely affecting on the anti-jamming performance compared to the number of signals and JSR.
Fast Congestion Control to Transmit Bursty Traffic Rapidly in Satellite Random Access Channel
Noh, Hong-Jun ; Lee, Yoon-Seong ; Lim, Jae-Sung ; Park, Hyung-Won ; Lee, Ho-Sub ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1031~1041
DOI : 10.7840/kics.2014.39C.11.1031
In this paper, we propose a traffic load control scheme, called fast congestion control (FCC), for a satellite channel using enhanced random access schemes. The packet repetition used by enhanced random access schemes increases not only the maximum throughput but also the sensitivity to traffic load. FCC controls traffic load by using an access probability, and estimates backlogged traffic load. If the backlogged traffic load exceeds the traffic load corresponding to the maximum throughput, FCC recognizes congestion state, and processes the backlogged traffic first. The new traffic created during the congestion state accesses the channel after the end of congestion state. During the congestion state, FCC guarantees fast transmission of the backlogged traffic. Therefore, FCC is very suitable for the military traffic which has to be transmit urgently. We simulate FCC and other traffic load control schemes, and validate the superiority of FCC in latency.
Improving Transmission in Association with the Distance for Military Microwave Communications
Youn, Jong Taek ; Lim, Young Gap ; Kim, Young Ho ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1042~1049
DOI : 10.7840/kics.2014.39C.11.1042
In Military MicroWave communication, the distance of link, availability, transmission capacity is the important point in order to design the circuit. Currently, operated by fixed modulation, in the future it will be evolved to the modulation techniques enabled to increase the transmission capacity. It would be hard to consistently guarantee the transmission quality of the high-availability because the occurrence probability of fading increase in terms of the link distance for the case of the long distance. In the case of the modulation techniques for the transmission of high-capacity, as the distance is long, a falling-off in the fade margin from the link budget analysis cause the decrease in the availability. It is difficult to provide QoS guaranteed connection. In this paper, we propose the performance improvement technique of transmission by the variable allocation of the bandwidth and the higher priority transmission technique using setting the ratio of the higher priority capacity in association with the distance of link. Also we suggest the alternative of the calculation for channel transmission capacity to design the circuit.
Methodology of Immediate Close Air Support(CAS) Sortie Distribution
Jang, Yongjin ; Lee, Taegong ; Kim, Youngdong ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1050~1067
DOI : 10.7840/kics.2014.39C.11.1050
CAS(Close Air Support) is aircraft attack against hostile targets that are in close proximity to friendly forces. Immediate CAS is the mission that attack unplanned targets, and especially the distribution of suitable aircraft assets makes huge effect on the result of immediate CAS mission. But It is hard to find a previous studies on immediate CAS sortie distribution with aircraft suitability. This study suggests a methodology with aircraft suitability for immediate CAS sortie distribution. The methodology consists of 3 steps. Firstly, we analyze target information for situational awareness. Secondly, we calculate each aircraft`s suitability value per each target based on the result of previous analysis. Lastly, we suggest immediate CAS sortie distribution based on the aircraft adoptability value to a decision maker. This methodology will provide not only quantitative analysis, but also decision making of immediate CAS sortie distribution more timely and effectively.
Mobile Sink Based Energy Efficient Path Setup Method for Wireless Sensor Networks
Yang, Seung-Hyun ; Lee, Soong-Yeol ; Rho, Hai-Hwan ; Son, Won-Kee ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1068~1077
DOI : 10.7840/kics.2014.39C.11.1068
In this paper, we propose a novel method for path setup that optimizes energy consumptions for wireless sensor network. Existing studies usually generate paths according to Random way point approach so that it requires unnecessary energy consumptions for estimating location of the mobile sink node and transmission paths of packets. To address this problem, we propose a method that creates paths for mobile sink node using the Hilbert curve. Moreover, our method adjusts the path of the mobile sink node according to the density of sensor nodes to minimize data transmission delay. In our experiments, the proposed method outperforms existing work such as TTDD and CBPER by up to 50 times in terms of energy efficiency.
Distributed Mobility Management Scheme for the Tactical Network
Kim, Yongsin ; Sun, Kyoungjae ; Kim, Younghan ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1078~1087
DOI : 10.7840/kics.2014.39C.11.1078
In the conventional centralized mobility management schemes, it can lead to single points of failure, occurrence of a bottleneck, since all data and control are concentrated on the mobility anchor which is located in home network. In the current research of distributed mobility management, it is doing research into distributed mobility management which is supported by distributed mobility anchors. Such schemes do not consider a failure of the mobility anchor. However, it could be an issue under tactical environment since it occur non-service problem due to anchor movement, maintenance, failure, etc. In this paper, we proposed new DMM scheme named T-DMM(Tactical-Distributed Mobility Management) which can support handover even if mobility anchor breaks down. From the numerical analysis, we evaluate signaling cost and handover latency.
Designing a Common Weapon Interface Module While Taking into Account the Fire Control System Architecture of a Light Armed Helicopter
Lee, Dongho ; Park, Hanjoon ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1088~1093
DOI : 10.7840/kics.2014.39C.11.1088
The structure of the fire control system(FCS) of a light armed helicopter and effective logistics support was taken into account in the proposed common weapon interface module(CWIM) for a distributed FCS. The pros and cons of a distributed FCS and a centralized FCS were analyzed, then a CWIM which can be applied to the weapon interface module of a distributed FCS was designed and fabricated. Integration tests between the proposed CWIM and a weapon simulator were conducted to ascertain whether or not the proposed CWIM could be applicable to a distributed FCS. We expect that the CWIM design approach method secured through this study will be helpful in mitigating cable work of the FCS which will be applied to a Light Armed Helicopter and controlling various weapons.
Design Method for Integrated Modular Avionics System Architecture
Park, Han-Joon ; Go, Kwang-Chun ; Kim, Jae-Hyun ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1094~1103
DOI : 10.7840/kics.2014.39C.11.1094
In this paper, we survey the works related to the system architecture of avionics and extract characteristics from the related works. On the basis of the investigation, we propose an integrated modular avionics (IMA) architecture that can be used for current avionic upgrades and future avionic developments based on the IMA Core system. To verify the feasibility of the proposed IMA architecture, we have developed the prototype of the IMA Core system that consists of both the common hardware module and the IMA software. It was verified that the developed prototype with the common hardware module contributes to the improvement of maintainability because it can save the time and expenses for the development and can reduce the number of types of hardware modules when compared with Federated architecture. It was also confirmed that the developed prototype can save not only overall system weight, size, and power consumption but also the number of hardware types because the IMA software can support the integrated processing where the single processing hardware module can process multiple software applications.
Resource Reservation Based Image Data Transmission Scheme for Surveillance Sensor Networks
Song, Woon-Seop ; Jung, Woo-Sung ; Ko, Young-Bae ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1104~1113
DOI : 10.7840/kics.2014.39C.11.1104
Future combat systems can be represented as the NCW (Network Centric Warefare), which is based on the concept of Sensor-to-Shooter. A wireless video sensor networking technology, one of the core components of NCW, has been actively applied for the purpose of tactical surveillance. In such a surveillance sensor network, multi-composite sensors, especially consisting of image sensors are utilized to improve reliability for intrusion detection and enemy tracing. However, these sensors may cause a problem of requiring very high network capacity and energy consumption. In order to alleviate this problem, this paper proposes an image data transmission scheme based on resource reservation. The proposed scheme can make it possible to have more reliable image data transmission by choosing proper multiple interfaces, while trying to control resolution and compression quality of image data based on network resource availability. By the performance analysis using NS-3 simulation, we have confirmed the transmission reliability as well as energy efficiency of the proposed scheme.
Analysis On Optimized WNW Topology And Traffic Modeling Under Tactical Environment
Jang, Jae-Young ; Kim, Jung-Ho ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1114~1121
DOI : 10.7840/kics.2014.39C.11.1114
Armed forces conducts war under volatile and unpredictable situation. Constructing communication system which ensures a victory is very important and difficult work. Traffic modeling has been conducted to derive WNW topology which meets operational requirements and capability under tactical environment. The result of study explains based on DTaQ`s IER that company level cluster has 10~20% better packet receive rate than brigade level size.
Overlap-Based Chirp Spread Spectrum Transmission Scheme for Maritime Multipath Environment
Chae, Keunhong ; Lee, Seong Ro ; Yoon, Seokho ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1124~1131
DOI : 10.7840/kics.2014.39C.11.1124
The chirp spread spectrum (CSS) technique that transmits data signal by using a chirp signal is often used for maritime wireless communication systems such as sound detection radar systems for submarines. However, maritime multipath environment could reduce the data rate of the CSS system. To tackle the problem, an overlap-based CSS transmission scheme is proposed and analyzed in this paper: Based on the approximated Gaussian Q function, we derive a closed form expression of the bit error rate (BER) of the proposed overlap-based CSS system and investigate the mathematical relationship between the number of overlaps and the intersymbol interference (ISI).
Binomial Filters for Spectrum Sensing in Cognitive Radio System
Seong, JinSuk ; Kim, Myungsup ; Lee, Seong Ro ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1132~1138
DOI : 10.7840/kics.2014.39C.11.1132
In this paper, we proposed three types of binomial filter for spectrum sensing in cognitive radio system. Three filters are binomial, negative binomial and composite binomial filters and the frequency responses of their transfer functions are analyzed and the numbers of stages to meet the required attenuation are driven. As a result of performance analysis in terms of the number of stages, negative and composite binomial filters are superior to the binomial filter. Since the proposed three filters have a unified cascaded structure and are easy to be implemented without any multiplier, it is expected that they will have wide applications.
Packet Off-Loading Scheme Using a Femto-Cell Local Gateway and D2D Communication at Remote Shipyards
Han, Kyeongil ; Cho, Yongcheon ; Lee, Seongro ; Min, Sangwon ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1139~1145
DOI : 10.7840/kics.2014.39C.11.1139
In shipyard site, a ship is constructed by integrating lots of modules that are made in several sites with different capabilities and specifications. Recently, it needs to make a shipyard to be smart communicating various multimedia information with wired and wireless broadband networks between hierarchical shipyards. In this paper, we propose an additional function of an LTE femtocell local gateway at a remote shipyard, an information exchange method between hierarchical shipyards, and an offload method to separate the general traffic. To reduce traffic of duplicated requests in shipyard, we apply a D2D communication scheme for supporting communication between shipyard equipments without IP service network. Hence, it is expected to increase the productivity of shipyard industry with mobile communications, D2D and broadband Internet technologies.
Efficient Data Transmission Scheme with Data Fusion inside a Smart Vessel
Kim, Yeon-Geun ; Lee, Seong Ro ; Jeong, Min-A ; Kim, Beom-Mu ; Min, Sang-Won ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1146~1150
DOI : 10.7840/kics.2014.39C.11.1146
Recently, there has been interests in smart vessel technology, and it needs to consider an intelligent control system for efficient vessel manangement. In a smart vessel, however, it can cause a network overload due to a number of data transmission from a variety of sensor nodes and bridge nodes. In this letter, we propose an data transmission scheme with data fusion to reduce the number of traffic from the sensor nodes. Hence it can decrease network overload for intelligent vessel management.
Efficient Transmission Schemes in UWB Based Ship Area Networks
Kim, Jin-Woo ; Kwon, Jang-Woo ; Jeong, Min-A ; Lee, Seong Ro ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1151~1158
DOI : 10.7840/kics.2014.39C.11.1151
In this paper, a concatenated frame algorighm for improving transmission efficiency in WiMedia protocol is studied. And an efficient transmission scheme to reduce the degradation of network performance by the loss of mini-frame is proposed in this paper. The proposed scheme can reduce total energy consumption and improve the transmission efficiency since it only retransmits mini-frame in which error is occurred. The simulation results show that proposed protocol can enhance the throughput performance and improve energy efficiency by minimizing the retransmission of mini-frame.
Resource Management Scheme for Improvement of Reliability and Connectivity in wireless USB System
Kim, Jin-Woo ; Jeong, Min-A ; Lee, Seong Ro ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1159~1166
DOI : 10.7840/kics.2014.39C.11.1159
In this paper, a resource management scheme for enhancing the network connectivity and reliability in wireless USB system is proposed. Wireless USB protocol is suitable for the application that supports the real-time multimedia service in Ship Area Network since it supports high speed data transfer. However, the device`s mobility is caused the dramatic change of link state and network topology, and is occurred the degradation of network performance. Therefore, a resource management scheme for wireless USB system is proposed in this paper. The proposed technique can intelligently treat the change of link state, and solve the degradation of network performance. The simulation results show that proposed protocol can enhance the throughput and delay performance by selecting relay device with better link state.
Relay Communication Scheme for Connectivity Improvement between Smart Devices in Ship Area Networks
Lee, Seong Ro ; Kim, Beom-Mu ; Kwon, Jang-Woo ; Jeong, Min-A ; Kim, Jin-Woo ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1167~1176
DOI : 10.7840/kics.2014.39C.11.1167
In this paper, a relay communication scheme for enhancing the WiMedia network performance by device`s mobility is proposed. WiMedia protocol is suitable for the application that supports the real-time multimedia service in Ship Area Network since it supports high speed data transfer. However, the device`s mobility is caused the dramatic change of link state and network topology, and is occurred the degradation of network performance. Therefore, a relay communication scheme for WiMedia network is proposed in this paper. The proposed technique can intelligently treat the change of link state, and solve the degradation of network performance.
Packet Drop Technique for Differentiated Services in Wired Ship Area Networks
Lee, Seong Ro ; Kwon, Jang-Woo ; Jeong, Min-A ; Hur, Kyeong ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1177~1184
DOI : 10.7840/kics.2014.39C.11.1177
An wired ship area network has functionality of remote control and autonomous management of various sensors and instruments embedded or boarded in a ship. For such environment, the DiffServ (Differentiated Services) realizes that the high-speed real-time flow with the higher priority has the guaranteed minimum data rate and is delivered faster. As a result of this DiffServ effect, the intelligent Ship Area Networks can be implemented. In this paper, an packet drop technique is proposed to outperform the previous RIO (RED In and Out) drop mechanism for DiffServ in ship area networks. the proposed packet drop technique does not manage the individual flows and divides them into several flow groups according to a criterion. And it guarantees the fairness between individual flows in the same QoS class through the group-based control. In simulation results of the proposed packet drop technique, the link utilization decreases than RIO. But it guarantees more data rates to DiffServ flows passing multiple bottleneck links.
Energy Efficient Grid-Based WPAN Protocol for Ship Area Networks
Lee, Seong Ro ; Jeong, Min-A ; Hur, Kyeong ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1185~1191
DOI : 10.7840/kics.2014.39C.11.1185
An integrated ship area network has functionality of remote control and autonomous management of various sensors and instruments embedded or boarded in a ship. For such environment, a wireless bridge is essential to transmit control and/or managing information to sensors or instruments from a central integrated ship area network station. In this paper, one of reliable schemes of In-ship sensor networks using a Grid-based WPAN is proposed. The proposed scheme is based on a novel grid network which allows a multi-path communication, and is robust, energy efficient. The results demonstrate that the proposed Grid-based WPAN outperforms the IEEE 802.15.4 based network in terms of success ratio and power efficiency.
Performance Evaluation of Cooperative Spectrum Sensing in Maritime Cognitive Radio Networks
Nam, Yujin ; Lee, Yundong ; Lee, Seong Ro ; Jeong, Min-A ; So, Jaewoo ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1192~1200
DOI : 10.7840/kics.2014.39C.11.1192
This paper proposes a cooperative spectrum sensing algorithm in a maritime cognitive radio network and evaluates the performance of proposed algorithm. In the proposed algorithm, the secondary ships decide whether to transmit the feedback information or not on the basis of the threshold when the number of available feedback information of the ships is limited. The fusion ship detects whether the channel is available or not on the basis of the feedback information. This paper evaluates the proposed algorithm in terms of the detection probability and the number of secondary ships that are fed back in the maritime cognitive radio network. The simulation results show the proposed algorithm significantly reduces the feedback overhead even though the detection probability is somewhat declined.
Performance Evaluation of a HARQ-ARQ Interaction Scheme for Reliable Communications in Marine Communication Networks
Son, Jaekwang ; Lee, Seong Ro ; So, Jaewoo ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1201~1208
DOI : 10.7840/kics.2014.39C.11.1201
As the wireless communication technologies are being studied for application to marine communication networks in a fusion of marine industries and IT technology, this paper proposes a HARQ-ARQ interaction scheme for reliable communication between the smart ships. Moreover, this paper evaluates the performance of the HARQ-ARQ interaction schemes through the computer simulation. In the HARQ-ARQ interaction scheme for marine network systems, as a HARQ acknowledgement is implicitly utilized as an ARQ acknowledgement. Hence, the HARQ-ARQ interaction scheme can reduce the packet delay. However, the HARQ-ARQ interaction scheme has problems caused by the error of HARQ feedback messages. Hence, this paper considers the effect of error of HARQ feedback messages on the performance of the HARQ-ARQ interaction scheme, in marine network systems. The simulation results show that the HARQ-ARQ interaction scheme can improve the delay performance of the ships in the marine network systems.
User-Body Shadowing Analysis Technique in Ship Environment Based on the Uniform Geometrical Theory of Diffraction
Kim, Chang-Hoe ; Jung, Jae-Hoon ; Lee, Seong Ro ; Kim, Seong-Cheol ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1209~1215
DOI : 10.7840/kics.2014.39C.11.1209
The Uniform Geometrical Theory of Diffraction(UTD) is an effective technique to analyze the radio wave by ray-based calculation of the diffraction coefficient and the reflection coefficient. In this paper, user body shadowing based on the UTD is investigated when the user is close to the mobile device. Two cases are introduced. One is that the user is calling with the mobile attached to the ear(Head Model). The other is that the mobile is located about 15cm away from the user`s chest(Chest Model) Radiation Model and Scattering Model are applied to these cases presenting which model is applicable.
Efficient Handover Scheme for a Peer-to-Peer Download Service on Board
Cho, Kwang-Hyun ; Lee, Seong Ro ; Jeong, Min-A ; Kim, Dong Ho ;
The Journal of Korean Institute of Communications and Information Sciences, volume 39C, issue 11, 2014, Pages 1216~1223
DOI : 10.7840/kics.2014.39C.11.1216
Internet traffic is rapidly increasing due to the spread of personal smart devices and the demand for multimedia contents. When designing a large ship such as cruise, network architecture is also considered which supports various IT services in a maritime environment similar to the ground environment. In this paper, we consider wireless P2P (peer-to-peer) communication for efficient multimedia content sharing and propose novel handover scheme for efficient download service. The proposed handover method shows that it can improve the download symbol rates for handover in a wireless P2P system considering the signal strength and quality of peers as well. The proposed system is expected to provide efficient contents distribution and reliable communication in the ship-area-network (SAN).