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Search Results: 1 - 10 of 455 matches for " Rosli Salleh "
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Handoff Techniques for 4G Wireless Mobile Internet
Xichun Li,Rosli Salleh
Information Technology Journal , 2007,
Abstract: In this study, new handoff technique is developed to support wireless mobile bandwidth efficiency and higher data rates. This study will address handoff issues when a mobile node comes into WLAN overlapping region from a CDMA2000 coverage area and the mobile node will be supplied service by these two networks simultaneously through setting up a mix-bandwidth data path between the two networks. The performance of the proposed new data path will be evaluated and compared with current existing scheme through extensive simulations. The cost of the established new data path is also evaluated in terms of throughput and data transmission efficiency.
Fast Handoff for 802.11 Wireless Network  [PDF]
Obay H. Sabrie, Hasan S. Hasan, Rosli Salleh
Communications and Network (CN) , 2011, DOI: 10.4236/cn.2011.34029
Abstract: Whenever the mobile station moves from the range of one access point and comes to the range of another access point a handoff process is occurred. This process takes a long time when using the IEEE 802.11 standard handoff and this delay affect the real time and multimedia applications. This paper provides a layer 2 handoff process for the IEEE 802.11 that is able to eliminate the scanning delay and reduce the total handoff delay.
Employing Orphan Nodes to Avoid Energy Holes in Wireless Sensor Networks  [PDF]
Sepideh Zareei, Elham Babaee, Rosli Salleh, Saeed Moghadam
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2112
Abstract:

When energy consumption by wireless sensor nodes gets off balance, partitions in the network appear because several of the nodes stop functioning. The respective network’s lifetime also diminishes. This problem is commonly known as the “hot spot” or “energy hole” phenomenon. To resolve this issue, a Multi-Hop Decentralized Cluster-Based Routing (MDCR) protocol is proposed. This algorithm uses orphan nodes as intermediate nodes to form inter-cluster multi-hop routing and balance the energy consumption among sensor nodes. Simulation experiments have shown that MDCR is significantly better at prolonging network lifetime compared to the Adaptive Decentralized Re-Clustering Protocol.

 

Enhancing Handoff Process using IAPP with Caching Techniques
Obay H. Sabrie,Rosli Salleh
Journal of Applied Sciences , 2009,
Abstract: This study propose a layer 2 method to enhance the handoff process through eliminating the scanning delay and reduce the time taken to perform a handoff by using Inter Access Point Protocol (IAPP) neighbor’s discovery with access point and station caching techniques, in order to build a List of Neighbors and provide the station with the next possible AP to authenticate directly.
Performance Evaluation of Percent Root Mean Square Difference for ECG Signals Compression.
Fazly Salleh Abas,Rizwan Javaid,Rosli Besar
Signal Processing : An International Journal , 2008,
Abstract: Electrocardiogram (ECG) signal compression is playing a vital role in biomedical applications. The signal compression is meant for detection and removing the redundant information from the ECG signal. Wavelet transform methods are very powerful tools for signal and image compression and decompression. This paper deals with the comparative study of ECG signal compression using preprocessing and without preprocessing approach on the ECG data. The performance and efficiency results are presented in terms of percent root mean square difference (PRD). Finally, the new PRD technique has been proposed for performance measurement and compared with the existing PRD technique; which has shown that proposed new PRD technique achieved minimum value of PRD with improved results.
Throughput Optimization of Unplanned Wireless Mesh Networks Deployment Using Partitioning Hierarchical Cluster (PHC)
Ahmed. K. Hasan,A. A. Zaidan,Rosli Salleh,Omar Zakaria
Lecture Notes in Engineering and Computer Science , 2009,
Abstract:
Securing Binding Update in Mobile IPv6 Using Private Key Base Binding Update Protocol
Hero Modares,Rosli Salleh,Amirhosein Moravejosharieh,Hossein Malakootikhah
Computer Science , 2012,
Abstract: Mobile IPv6 control signalling messages generally act as informants to the home agent (HA) and the correspondent node (CN) regarding a mobile node's (MN's) new address when its network attachment point changes. Messages should be protected to avoid different security attacks. In the existing standard, control signalling messages between HA and MN are frequently authenticated with IKEv2 and X.509 certificates via IPSec. These signalling messages between MN and CN are so far protected by an effective but insecure protocol. A protocol that uses Binding Update Route Optimisation has security vulnerabilities that allow redirection of traffic by attackers. This traffic is intercepted and then false binding updates is sent along with packet eavesdropping and Denial of Service (DoS) that disrupts any communication. Due to lack of ineffective authentication procedures to ascertain the validity of the users or hide the location data of HoA and CoA, security issues mentioned above will occur. This paper presents some of existing protecting control signalling message protocols, as well as some proposed approaches for designing a secure method-based private key IP address between an MN and a CN. Using Private Key Based Binding Update (PKBU), care-of-address (CoA) can thus be protected against False Binding Update (FBU), Man-in-the-Middle (MITM) and Denial-of-Service (DoS) attacks.
(E)-4-Hydroxy-N′-(2-methoxybenzylidene)benzohydrazide
Hesham Hussein Rassem,Abdussalam Salhin,Baharuddin Bin Salleh,Mohd Mustaqim Rosli
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812021952
Abstract: In the title compound, C15H14N2O3, the dihedral angle between the benzene rings is 66.56 (5)°. In the crystal, N—H...O, O—H...O and C—H...O interactions link the molecules into a three-dimensional network. A π–π interaction, with a centroid–centroid distance of 3.628 (6) , helps to establish the packing.
(E)-4-Hydroxy-N′-(2-hydroxy-4-methoxybenzylidene)benzohydrazide
Hesham Hussein Rassem,Abdussalam Salhin,Baharuddin Bin Salleh,Mohd Mustaqim Rosli
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812027201
Abstract: In the title compound, C15H14N2O4, the dihedral angle between the benzene rings is 40.59 (4)° and an intramolecular O—H...N hydrogen bond generates an S(6) ring. In the crystal, N—H...O, O—H...O and C—H...O interactions link the molecules into a three-dimensional network.
Polycyclic Aromatic Hydrocarbons in Coastal Sediment of Klang Strait, Malaysia: Distribution Pattern, Risk Assessment and Sources
Seyedeh Belin Tavakoly Sany, Rosli Hashim, Aishah Salleh, Majid Rezayi, Ali Mehdinia, Omid Safari
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0094907
Abstract: Concentration, source, and ecological risk of polycyclic aromatic hydrocarbons (PAHs) were investigated in 22 stations from surface sediments in the areas of anthropogenic pollution in the Klang Strait (Malaysia). The total PAH level in the Klang Strait sediment was 994.02±918.1 μg/kg dw. The highest concentration was observed in stations near the coastline and mouth of the Klang River. These locations were dominated by high molecular weight PAHs. The results showed both pyrogenic and petrogenic sources are main sources of PAHs. Further analyses indicated that PAHs primarily originated from pyrogenic sources (coal combustion and vehicular emissions), with significant contribution from petroleum inputs. Regarding ecological risk estimation, only station 13 was moderately polluted, the rest of the stations suffered rare or slight adverse biological effects with PAH exposure in surface sediment, suggesting that PAHs are not considered as contaminants of concern in the Klang Strait.
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