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Probabilistic Approach to Predicting Residual Longitudinal Strength of Damaged Double HullVLCC
Van-Vu Huynh,Seung-Hyun Lee,Sang-Rai Cho 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.3
This paper estimates the residual longitudinal strength af a damaged double hull VLCC (Very Large Crude Carrier) under combined vertical and horizontal bending moments using Smith’s method. The damage estimated in this study occurred due to collision or grounding accidents. The effects af the randomness af the yield stress, plate thickness, extent of damage, and the combination af these three parameters on the ultimate hull girder strength were investigated. Random variables were generated by a Monte Carlo simulation and applied to the double hull VLCC described by the ISSC (International Ship and Offshore Structures Congress) 2000 report.
Reliability analysis of Residual longitudinal strength of damaged ships.
Huynh Van-Vu,Cho Sang-Rai 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
In the present study, based on the value of residual longitudinal strength of damaged ships was predicted by the Smith's method, the reliability analysis has been carried out for both vertical and horizontal bending moments. The limit state function was derived based on the interaction equation. Four cases of still water bending moment and two Monte Carlo simulations which different samples have been performed. This study focused on Bulk Carrier and Double Hull VLCC in ISSC 2000.
Overview of LED Communication Networks
Huynh, Vu Van,Le, Nam-Tuan,Uddin, Muhammad Shahin,Choi, Sun-Woong,Jang, Yeong-Min The Korea Institute of Information and Commucation 2011 정보와 통신 Vol.28 No.12
Visible light communication(VLC) is one type of short-range, optical, and wireless communication system utilizing light emitting diode(LED) and laser diode(LD) as optical source. In a VLC system, visible light is used as a transmission medium and used to illuminate. Using VLC has a lot of advantages: it is harmless to human body; it transmits with high power, and it has excellent security, a high data rate, and a license free frequency band. With such a unique blend of communication and illumination in one system, the most common application would be an indoor environment. We aim at reviewing key issues in VLC network such as : FOV(field of view), priority MAC, cooperative MAC, link switching, LED-ID technique, cell site diversity, and link recovery.
Overview of LED Communication Networks
Vu Van Huynh,Nam-Tuan Le,Muhammad Shahin Uddin,Sunwoong Choi,Yeong Min Jang 한국통신학회 2011 정보와 통신 Vol.28 No.12
Visible light communication(VLC) is one type of shortrange, optical, and wireless communication system utilizing light emitting diode(LED) and laser diode(LD) as optical source. In a VLC system, visible light is used as a transmission medium and used to illuminate. Using VLC has a lot of advantages: it is harmless to human body; it transmits with high power, and it has excellent security, a high data rate, and a license free frequency band. With such a unique blend of communication and illumination in one system, the most common application would be an indoor environment. We aim at reviewing key issues in VLC network such as:FOV(field of view), priority MAC, cooperative MAC, link switching, LED-ID technique, cell site diversity, and link recovery.
Effect of longitudinal extents of damage on Residual longitudinal strength of damaged ships.
Huynh Van-Vu,Cho Sang-Rai 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
Based on the Smith's method, while calculating the residual longitudinal strength of damaged ship hull girders, the longitudinal extents of damage was not taken into account. Just only the two dimensional transverse section, which is transverse and vertical extents according to an assumption of rules, was considered. The longitudinal extent of damage assumed occurring on an overall length of bays. Therefore, for estimating the effect of longitudinal extents of damage, the residual longitudinal strength under vertical bending moment of damaged ships will be performed by a nonlinear finite element method (FEM) analysis which using many three dimensional models have taken as longitudinal extent of damage differences. This study has been analyzed on the commercial software ABAQUS with modified RIKS method and it to be applied on two models MST-3 and MSD of Nishihara experiments, the 1/3-scale Frigate model and the Double Hull VLCC in ISSC 2000.
Priority MAC based on Multi-parameters for IEEE 802.15.7 VLC in Non-saturation Environments
Vu Van Huynh,Le Nam-Tuan Le,Yeong Min Jang 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.3C
Priority MAC is an important issue in every communication system when we consider differentiated service applications. In this paper, we propose a mechanism to support priority MAC based on multi-parameters for IEEE 802.15.7 visible light communication (VLC). By using three parameters such as number of backoff times (NB), backoff exponent (BE) and contention window (CW), we provide priority for multi-level differentiated service applications. We consider beacon-enabled VLC personal area network (VPAN) mode with slotted version for random access algorithm in this paper. Based on a discrete-time Markov chain, we analyze the performance of proposed mechanism under non-saturation environments. By building a Markov chain model for multi-parameters, this paper presents the throughput and transmission delay time for VLC system. Numerical results show that we can apply three parameters to control the priority for VLC MAC protocol.
Fairness CSMA/CA MAC Protocol for VLC Networks
Huynh, Vu Van,Jang, Yeong-Min The Institute of Internet 2012 Journal of Advanced Smart Convergence Vol.1 No.1
This paper presents a fair MAC protocol based on the CSMA/CA algorithm in visible light communication (VLC) networks. The problem of bandwidth sharing among differentiated priority in VLC networks can be solved by using number of backoff time and backoff exponent parameters with AIFS. The proposed algorithm can achieve fair allocation of the bandwidth resource among differentiated priority. The two dimension Markov chain is assisted for analyzing the proposed mechanism about throughput and delay metrics. Numerical results show that our proposed algorithm improves the fairness among different traffic flows.