3,377 research outputs found
Design and implementation of a man-overboard emergency discovery system based on wireless sensor networks
No full textRecently, wireless sensor networks (WSNs) have been widely employed in many different fields such as military, surveillance, health, agricultural, automation, and environmental monitoring. This paper presents a designed and implemented WSN-based man-overboard emergency discovery system, abbreviated as W-MEDS, that discovers the location of a person in emergency circumstances and runs an alarm system on a ship. The developed W-MEDS carries out a fast man-overboard (MOB) discovery and initiates the vital rescue procedure. It mainly consists of a WSN and a control and discovery system. When a MOB accident occurs, this situation is easily detected through the WSN nodes capable of real-time sensing (i.e. temperature, humidity, and acceleration) and the system enables location estimation. The control and discovery system analyzes and displays the received data from the WSN nodes. The most noteworthy advantage of the proposed W-MEDS is that it enables both real-time alarm monitoring and fast recovery. In addition to the implementation of the W-MEDS, considering hardness in performance evaluation of the real system, it has also been simulated in the OPNET Modeler to confirm the accuracy for different sizes and numbers of nodes
Design and implementation of a new quality of service-aware cross-layer medium access protocol for wireless body area networks
No full textWireless body area networks (WBANs) consist of tiny sensors that enable monitoring the health status of a person. quality of service (QoS) is a major challenge for WBANs due to the importance of vital sign information. Therefore, many QoS-based medium access control (MAC) protocols and technologies have been developed to overcome this problem. Standardization of various technologies and protocols must be addressed. ISO/IEEE 11073 personal health data standards aim to provide interoperability between healthcare devices and technologies. This paper presents a new QoS-aware cross-layer MAC protocol based on the ISO/IEEE 11073 standards that employs a slot allocation scheme, multi-channel architecture, priority mechanism, admission control, and cross-layer solution. The proposed MAC protocol has been modeled and simulated by OPNET Modeler. In addition, the proposed MAC protocol is compared with standard technologies and recent protocols in the literature, and it achieves better results for end-to-end delay, packet loss ratio, and throughput parameters. (C) 2016 Elsevier Ltd. All rights reserved
ENHANCED SECURE DATA TRANSFER FOR WSN USING CHAOTIC-BASED ENCRYPTION
No full textProcesses on Wireless Sensor Networks (WSN) and their areas of use have become more widespread, and the issue of net-work security has appeared as one of the primary necessities. As power of the processor, memory and energy sources are limited on wireless sensor network nodes, traditional encryption structures are not found effective. With these criteria taken into consideration, the need for less process load and energy consumption as well as a powerful encryption is obvious. In this study, a chaotic encryption system to meet the security need on WSN using chaotic systems was carried out. The chaotic system developed here and the commonly used Skipjack encryption were compared with the help of algorithm OPNET Modeller software and better results were achieved
isMAC: An Adaptive and Energy-Efficient MAC Protocol Based on Multi-Channel Communication for Wireless Body Area Networks
No full textRecently, the use of wireless body area networks (WBAN) has been increasing rapidly in medical healthcare applications. WBANs consist of smart nodes that can be used to sense and transmit vital data such as heart rate, temperature and ECG from a human body to a medical centre. WBANs depend on limited resources such as energy and bandwidth. In order to utilise these resources efficiently, a very well organized medium access control (MAC) protocol must be considered. In this paper, a new, adaptive and energy-efficient MAC protocol, entitled isMAC, is proposed for WBANs. The proposed MAC is based on multi-channel communication and aims to prolong the network lifetime by effectively employing (i) a collision prevention mechanism, (ii) a coordinator node (WCN) selection algorithm and (iii) a transmission power adjustment approach. The isMAC protocol has been developed and modelled, by using OPNET Modeler simulation software. It is based on a networking scenario that requires especially high data rates such as ECG, for performance evaluation purposes. Packet delay, network throughput and energy consumption have been chosen as performance metrics. The comparison between the simulation results of isMAC and classical IEEE 802.15.4 (ZigBee) protocol shows that isMAC significantly outperforms IEEE 802.15.4 in terms of packet delay, throughput and energy consumption
Comment on “Short-term effects of relaxation music on patients suffering from primary open-angle glaucoma”
No full textAbdullah Kaya,1 Yakup Aksoy,2 Mehmet Koray Sevinç,3 Oktay Diner41Department of Ophthalmology, Anittepe Military Dispansery, Ankara, Turkey; 2Department of Ophthalmology, Girne Military Hospital, Girne, Cyprus; 3Department of Ophthalmology, Beytepe Military Hospital, Ankara, 4Department of Ophthalmology, Erzurum Military Hospital, Erzurum, TurkeyWe read the current study “Short-term effects of relaxation music on patients suffering from primary open-angle glaucoma” by Bertelmann and Strempel, with great interest. The authors investigated if relaxation music had a positive effect on glaucoma.We congratulate the authors for this innovative study and want to make some contributions that may widen the impression area of this study. View original article by Bertelmann and Strempel
Interview with Sofie Abdullah
No full textفي هذه المقابلة، تتحدث الكاتبه صوفى عبد الله عن أسرار مهنة الكتابة.In this interview, Sofie Abdullah, a well-known Egyptian author, discusses the intricacies of the writing industry
Interview with Abdullah El Tayib
No full textفي هذه المقابلة، يتحدث الأديب والناقد والشاعر السوداني عبد الله الطيب عن مؤلفاته في النقد والقصص الشعبية ودواوينه الشعريه.In this interview, Sudanese author, intellectual, and poet Abdullah El Tayib discusses his collections of poetry, well-known stories, and critical writings
Interview with Abdullah Al-Baradouni
No full textلقاء مع الشاعر اليمنى عبد الله البرادوني للتكلم عن مكانة الشعر اليوم. أجرى اللقاء إبراهيم عابدين.An interview with Yemeni author and poet Abdullah Al-Baradouni about the role of poetry in modern times. Interview conducted by Ibrahim Abdeen
Task-Guided and Semantic-Aware Ranking for Academic Author-Paper Correlation Inference
No full textWe study the problem of author-paper correlation inference in big scholarly data, which is to effectively infer potential correlated works for researchers using historical records. Unlike supervised learning algorithms that predict relevance score of author-paper pair via time and memory consuming feature engineering, network embedding methods automatically learn nodes' representations that can be further used to infer author-paper correlation. However, most current models suffer from two limitations: (1) they produce general purpose embeddings that are independent of the specific task; (2) they are usually based on network structure but out of content semantic awareness. To address these drawbacks, we propose a task-guided and semantic-aware ranking model. First, the historical interactions among all correlated author-paper pairs are formulated as a pairwise ranking loss. Next, the paper's semantic embedding encoded by gated recurrent neural network, together with the author's latent feature is used to score each author-paper pair in ranking loss. Finally, a heterogeneous relations integrative learning module is designed to further augment the model. The evaluation results of extensive experiments on the well known AMiner dataset demonstrate that the proposed model reaches significant better performance, comparing to a number of baselines.We would like to thank Yuxiao Dong for suggestions. This work is supported by the Army Research Laboratory under Cooperative Agreement Number W911NF-09-2-0053 and the National Science Foundation (NSF) grant IIS-1447795. This work is partially supported by King Abdullah University of Science and Technology (KAUST)
Kajian Sastra Perjalanan dalam Hikayat Kisah Pelayaran Abdullah ke Mekah Karya Abdullah Bin Abdul Kadir Munsyi
No full textThis research is aimed to identify and to reveal a hikayat as classic travel literature of Indonesia by the travel writing theory of Carl Thompson. To gain those purposes, this research used literary criticism and descriptive-analytic methods. The object of this study is Kisah Pelayaran Abdullah ke Mekah by Abdullah bin Abdul Kadir Munsyi (1854), focusing on the six elements of travel writing by Carl Thompson’s approach based on the hikayat. This study shows that the hikayat contains six elements of travel writing. Those are self, other, movement, space, encounter, and writing. Abdullah as a sailor puts himself in his hikayat as the main character by using “sahaya” and “aku” to articulate “self” in his hikayat. The “self” during travel met new and foreign things that the author had never seen before. He drew and expressed his point of view, feeling, and observation of all the encounters that he had met during sailing in to hikayat.Keywords: Carl Thompson, hikayat, travel writin
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