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Cluster Based Clock Synchronization for Sensor Network
Mamun-Or-Rashid,Choong Seon HONG 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
Core operations (e.g. TDMA scheduler, synchronized sleep period, data aggregation) of many proposed protocols for different layer of sensor network necessitate clock synchronization. Our paper mingles the scheme of dynamic clustering and diffusion based asynchronous averaging algorithm for clock synchronization in sensor network. Our proposed algorithm takes the advantage of dynamic clustering and then applies asynchronous averaging algorithm for synchronization to reduce number of rounds and operations required for converging time which in turn save energy significantly than energy required in diffusion based asynchronous averaging algorithm.
Preventing Tunneling Attack Using Minimum and Approximate Hop Count for Secure MANET Routing
( Mamun-or-rashid ),( Choong Seon Hong ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
Providing security in any network is a well-studied problem. It is particularly arduous and challenging in mobile ad hoc networking. A number of attacks have been identified in mobile ad hoc network (MANET) routing. One such severe attack is tunneling attack that is difficult to protect against. Among the attacks tunneling attack, where two or more nodes may collaborate to encapsulate and exchange messages between them along with the existing data routes. One vulnerability is that two such nodes may collaborate to falsely represent the length of the available paths by encapsulating and tunneling between them legitimate route messages generated by other nodes. In this paper we propose minimum and approximation hop count for preventing tunneling attack. Distance between source and destination is calculated using GPS based location information and based on transmission range of the nodes we can calculate minimum and approximate hop between two nodes. Comparing the hop count from the packet received at the node with the minimum or approximate hop count we can discard falsifying routes and neighbors generated by the malicious nodes. Our proposal hinders from false routes and fake neighbors with little data overhead of added location information and processing overhead at the source and destination.
( Mamun-or-rashid ),( Choong Seon Hong ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.1
Congestion in WSN increases energy dissipation rates of sensor nodes as well as loss of packets and thereby hinders fair and reliable event detections. We find that one of the key reasons of congestion in WSN is allowing sensing nodes to transfer as many packets as possible. This is due to the use of CSMA/CA that gives opportunistic media access control. In this paper, we propose an energy efficient congestion avoidance protocol that includes source count based hierarchical and load adaptive medium access control. Our proposed mechanism ensures load adaptive media access to the nodes and thus achieves fairness in event detection. The results of simulation show our scheme exhibits more than 90% delivery ratio with retry limit 1, even under bursty traffic condition which is good enough for reliable event perception.
Energy-Aware QoS Provisioning for Wireless Sensor Networks: Analysis and Protocol
Alam, Muhammad Mahbub,Razzaque, Abdur,Mamun-Or-Rashid, Mamun-Or-Rashid,Hong, Choong-Seon The Korea Institute of Information and Commucation 2009 Journal of communications and networks Vol.11 No.4
Wireless sensor networks (WSNs) are envisioned to facilitate information gathering for various applications and depending on the application types they may require certain quality of service (QoS) guarantee for successful and guaranteed event perception. Therefore, QoS in WSNs is an important issue and two most important parameters that hinder the goal of guaranteed event perception are time-sensitive and reliable delivery of gathered information, while a minimum energy consumption is desired. In this paper, we propose an energy-aware, multi-constrained and multipath QoS provisioning mechanism for WSNs based on optimization approach. Hence, a detailed analytical analysis of reliability, delay and energy consumption is presented to formulate the optimization problem in an analytical way. A greedy algorithm is proposed to achieve the desired QoS guarantee while keeping the energy consumption minimum. Also, a simple but efficient retransmission mechanism is proposed to enhance the reliability further, while keeping the delay within delay bound. Simulation results demonstrate the effectiveness of our scheme.
Masum, Kazi Mohammad,Mamun, Abdullah Al,Mamun-Or-Rashid, Mohammad,Abdullah-Al-Mamun, M. M.,Islam, Mohammad Nabidul Institute of Forest Science 2012 Journal of Forest Science Vol.28 No.2
An explanatory survey was conducted to assess preference and consumption pattern of horticultural species, their sources, location-wise planting preferences and diversity of these species in the rural homestead forest of the offshore island of Bangladesh. Assessment was done through multistage random sampling. Based on homestead size respondents were categorized into small (<0.05 ha), medium (0.05-0.25 ha) and large (>0.25 ha) and twenty from each category were selected randomly for the study. The study revealed that most of the farmer (75.5%) preferred to plant fruit tree species for future plantation followed by timber species (62.2%). But fruit-bearing plants were being gradually replaced by some exotic timber species such as Swietenia mahagoni, Acacia auriculiformis, Tectona grandis, Eucalyptus spp., etc. Diversity and abundance of fruit species was found higher in almost all homestead. A total of 41 horticultural species were identified and seven horticultural species among them were recognized as the most preferred ones in the study area. Consumption pattern was chiefly to meet the nutritional demand and to gain a quick monetary benefit. Average annual income from horticultural species was 7,183.33 Taka (US$102).