Prabhat Ranjan - Academia.edu (original) (raw)

Papers by Prabhat Ranjan

Research paper thumbnail of Dynamic Modulation Scaling for Energy Efficient Topology Control of Wireless Sensor Networks

Wireless communication is the most energy expensive operation for energy constrained wireless sen... more Wireless communication is the most energy expensive operation for energy constrained wireless sensor networks. Different topology structures require different transmission power levels in order to maintain wireless connectivity between the nodes. For a highly energy constrained network like Wireless Sensor Network ( WSN) it is highly desired to have such a topology which will need less transmission power for network connectivity purpose. Dynamic modulation scaling (DMS) is a technique useful for optimizing transmission energy with respect to number of packets that need to be transmitted at that particular time intervals. In general, DMS trades off transmission energy against transmission delays. Multilevel (M-ary) modulation is the key aspect for dynamic modulation scaling. Dynamically varying the constellation size b (number of bits per symbol) with respect to number of packets that need to be transmitted helps in optimizing transmission power. In this scenario it is very important to decide minimum and maximum bounds on constellation size (scale of modulation) otherwise it may result in performance degradation. In this paper various factors affecting minimum and maximum limit of b are discussed and it is shown that the individual node can decide minimum limit on b but for deciding maximum limit it needs to consider network aspects such as network topology, node density, location of particular node etc. Only proper selection of these limits results in optimized power consumption with satisfactory performance. Otherwise trying to save energy without satisfying performance parameters will require retransmission and the energy cost for that will be much higher than what was saved earlier. In this paper we have focused on calculating the bounds on values of b for cluster base network topology. We have proposed effective cluster based topology generation mechanism with DMS to optimize transmission energy. Our objective here is to optimize the average transmission energy of deployed WSN through clustering, intra-cluster leveling and DMS for overall energy effectiveness of the network.

Research paper thumbnail of Power and Buffer Overflow Optimization in Wireless Sensor Nodes

Prolonging the life span of the network is the prime focus in highly energy constrained wireless ... more Prolonging the life span of the network is the prime focus in highly energy constrained wireless sensor networks. Sufficient number of active nodes can only ensure proper coverage of the sensing field and connectivity of the network. If most of the nodes get their batteries depleted then it is not possible to maintain the network. In order to have long lived network it is mandatory to have long lived sensor nodes and hence power optimization at node level becomes equally important as power optimization at network level. In this paper need for a dynamically adaptive sensor node is signified in order to optimize power at individual nodes. We have analyzed a wireless sensor node using queuing theory. A sensor node is looked upon as a tandem queue in which first server is the processor or micro controller and the second server in series is the transmitter. Both the servers have finite and very small buffers associated with them as the sensor nodes are tiny devices and have very limited hardware. In this paper we have analyzed and simulated sensor node models. First we have considered a sensor node working with fixed service rate (processing rate and transmission rate). Secondly we have considered an adaptive sensor node which is capable of varying its service rates as per the requirement and ensure the quality of service. We have simulated both the models using MATLAB and compared their performances like life time, power consumption, buffer overflow probability and idle time etc. We have compared the performances of both the models under normal work loads as well as when the catastrophe (heavy wok load) occurs. In both the situations an adaptive service model out performs the fixed service model as it saves the power during normal period and increases the lifetime and during catastrophe period it consumes more power but ensures the QoS (Quality of Service) by reducing the overflow probability.

Research paper thumbnail of Effect of network coding on buffer management in wireless sensor network

Intelligent Sensors, Sensor Networks and Information Processing Conference, 2008

In resource constrained wireless sensor networks (WSN), it is highly desirable to make efficient ... more In resource constrained wireless sensor networks (WSN), it is highly desirable to make efficient use of available buffer. Hence for the WSN designed for the monitoring applications, buffer management is a key requirement at sensor nodes. We have proposed an efficient buffer management scheme based on random linear network coding as the in-network processing on data packets. With buffer allocation from source to sink path, our scheme distributes the buffer requirement among the nodes on the path. Further in the case of a packet loss, the proposed scheme recovers packet from available information distributed on the path from source to sink. We have compared our scheme with conventional buffer management scheme. Results show that network coding based buffer management scheme has better buffer availability with less redundancy and reduced loss recovery cost.

Research paper thumbnail of Sensor networks to monitor quality of life in rural area

In this paper, we examine the possibility of Sensor Networks being used to monitor various parame... more In this paper, we examine the possibility of Sensor Networks being used to monitor various parameters, which affect quality of life in rural India and thereby provide an opportunity to improve the quality of life. Quality of life of human beings in rural area is integrated with that of ...

Research paper thumbnail of Co-Ordinated Adaptive Power (CAP) Managemet for Wireless Sensor Networks

2007 International Conference on Sensor Technologies and Applications (SENSORCOMM 2007), 2007

Abstract In order to have energy optimized sensor nodes a low power hardware design is the basic ... more Abstract In order to have energy optimized sensor nodes a low power hardware design is the basic requirement, on that low power device applying sleep scheduling algorithms further energy savings can be achieved. CAP ie co-ordinated adaptive power ...

Research paper thumbnail of Topology control algorithm for IEEE 802.15.4 based single sink wireless sensor networks

2011 Fifth IEEE International Conference on Advanced Telecommunication Systems and Networks (ANTS), 2011

IEEE 802.15.4 is a communication standard specifically designed, targeting resource constrained n... more IEEE 802.15.4 is a communication standard specifically designed, targeting resource constrained networks. IEEE 802.15.4 provides MAC and Physical layer specifications for low power personal area networks like wireless sensor networks. IEEE 802.15.4 is designed considering the energy concerns of network devices normally called sensor nodes in wireless sensor networks. As per the standard network nodes are categorized as Full Function

Research paper thumbnail of Optimizing Power and Buffer Congestion on Wireless Sensor Nodes Using CAP (Coordinated Adaptive Power) Management Technique

International Journal of Wireless & Mobile Networks, 2011

Limited hardware capabilities and very limited battery power supply are the two main constraints ... more Limited hardware capabilities and very limited battery power supply are the two main constraints that arise because of small size and low cost of the wireless sensor nodes. Power optimization is highly desired at all the levels in order to have a long lived Wireless Sensor Network (WSN). Prolonging the life span of the network is the prime focus in highly energy constrained wireless sensor networks. Sufficient number of active nodes can only ensure proper coverage of the sensing field and connectivity of the network. If large number of wireless sensor nodes get their batteries depleted over a short time span then it is not possible to maintain the network. In order to have long lived network it is mandatory to have long lived sensor nodes and hence power optimization at node level becomes equally important as power optimization at network level. In this paper need for a dynamically adaptive sensor node is signified in order to optimize power at individual nodes along with the reduction in data loss due to buffer congestion. We have analyzed a sensor node with fixed service rate (processing rate and transmission rate) and a sensor node with variable service rates for its power consumption and data loss in small sized buffers under varying traffic (workload) conditions. For variable processing rate Dynamic Voltage Frequency Scaling (DVFS) technique is considered and for variable transmission rate Dynamic Modulation Scaling (DMS) technique is considered. Comparing the results of a dynamically adaptive sensor node with that of a fixed service rate sensor node shows improvement in the lifetime of node as well as reduction in the data loss due to buffer congestion. Further we have tried to coordinate the service rates of computation unit and communication unit on a sensor node which give rise to Coordinated Adaptive Power (CAP) management. The main objective of CAP Management is to save the power during normal periods and reduce the data loss due to buffer congestion (overflow) during catastrophic periods. With CAP management we are trying to adaptively change the power consumption of sensor nodes. Power consumption of processing unit and communication unit are coordinated together and changed adaptively with respect to the workload. Coordination between processing and communication subunits results in better energy optimization as well as possible data loss before transmission because of limited buffer sizes can be avoided.

Research paper thumbnail of CAP (Coordinated Adaptive Power) Management Technique with Adaptive Threshold Policy for Wireless Sensor Nodes

Proceedings of the Asia-Pacific Advanced Network, 2011

Research paper thumbnail of EPCAP: Explicit Prioritized Channel Access Protocol for IEEE 802.15.4 based Wireless Sensor Networks

2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013

ABSTRACT IEEE 802.15.4 is a communication standard specifically designed targeting low power pers... more ABSTRACT IEEE 802.15.4 is a communication standard specifically designed targeting low power personal area networks. It provides MAC and Physical layer specifications for resource constrained networks like Wireless Sensor Networks(WSN). IEEE 802.15.4 MAC specification targets fairness as one of the design considerations. That creates a problem when IEEE 802.15.4 MAC is used for event driven WSN applications. For an example, in a WSN deployed to detect a forest fire an event of fire requires higher preferences than routine updates. To target this limitation, we have extended channel access mechanism of IEEE 802.15.4 MAC in the form of prioritized channel access mechanism namely Explicit Prioritized Channel Access Protocol (EPCAP). EPCAP adds different priority levels to IEEE 802.15.4 MAC to handle critical events. Further, we have modeled EPCAP as M/G/c multi-server queueing system. To show the effectiveness of our mechanism we have simulated and compared it with standard protocol.

Research paper thumbnail of Context Aware Middleware Architecture for Wireless Sensor Network

2009 IEEE International Conference on Services Computing, 2009

Wireless sensor networks are application specific, data centric networks where different applicat... more Wireless sensor networks are application specific, data centric networks where different applications run on deployed network. Each application interprets the underlying sensor network differently and each changing event has different effect on running applications. In this paper we have proposed context aware middleware architecture called as 'MidSen'. This architecture bridges the gap between multiple applications running at application level and deployed sensor networks. MidSen architecture handles static as well as dynamically changing network and application components. MidSen has adopted a rule based engine to handle system dynamics. Midsen makes applications flexible by allowing them to update their rules against knowledge base. Our experimental results show that proposed Context Aware Service Discovery (CASD) algorithm gives better recall value and precision compare to previously proposed discovery algorithms.

Research paper thumbnail of Intra-Cluster Topology Creation in Wireless Sensor Networks

2007 Third International Conference on Wireless Communication and Sensor Networks, 2007

Clustering is proven method for energy efficient control mechanisms through which WSN creates con... more Clustering is proven method for energy efficient control mechanisms through which WSN creates connected topology generation. However, in cluster formation high focus hierarchical network topology.

Research paper thumbnail of Bounds on Dynamic Modulation Scaling for Wireless Sensor Networks

2007 Third International Conference on Wireless Communication and Sensor Networks, 2007

Wireless communication is the most energy expensive operation for energy constrained wireless sen... more Wireless communication is the most energy expensive operation for energy constrained wireless sensor networks. Dynamic modulation scaling (DMS) is a technique useful for optimizing transmission energy with respect to number of packets that need to be transmitted at that particular time intervals. In general, DMS trades off transmission energy against transmission delays. Multilevel (M-ary) modulation is the key aspect for

Research paper thumbnail of Prioritized IEEE 802.15.4 for wireless sensor networks

2010 Wireless Advanced 2010, 2010

Abstract Wireless Sensor Network is application specific data centric networks, having applicatio... more Abstract Wireless Sensor Network is application specific data centric networks, having application span ranging from house hold application to mission critical applications. Applications like fire detection require immediate attention from the base station. Further ...

Research paper thumbnail of Optimized Rumor routing algorithm for Wireless Sensor Networks

2009 Fifth International Conference on Wireless Communication and Sensor Networks (WCSN), 2009

Wireless Sensor Network is data centric network that works on query reply mechanism with various ... more Wireless Sensor Network is data centric network that works on query reply mechanism with various types of quires. Rumor routing is on of the data centric routing algorithm for Wireless Sensor Networks. Literature shows that Rumor routing algorithm is energy efficient than the Ant ...

Research paper thumbnail of A survey: Topology control for wireless sensor networks

Signal Processing, Communications …, 2008

Wireless sensor network is a densely deployed resource stress network where each small chunk of r... more Wireless sensor network is a densely deployed resource stress network where each small chunk of resource adds the high value to over all network functionality. Topology control is a technique through which network controls it's dense deployment for efficient resource utilization. ...

Research paper thumbnail of Vacuum photodiode detectors for broadband vacuum ultraviolet detection in the Saha Institute of Nuclear Physics Tokamak

Review of Scientific Instruments, 1997

We report on the application of the vacuum photodiode to detect vacuum ultraviolet ͑VUV͒ radiatio... more We report on the application of the vacuum photodiode to detect vacuum ultraviolet ͑VUV͒ radiation emitted from the Saha Institute of Nuclear Physics ͑SINP͒ Tokamak. It is simple to fabricate and provides broadband spectral response in the VUV and ultrasoft x ray ͑10 eV-1 keV͒. In our design, a stainless steel photocathode is used, which has a response identical to tungsten in the wavelength range 100-1200 Å. Its surface is passivated, to minimize contamination and monolayer deposition, by electropolishing it. Some representative experimental results illustrating the range of applicability are presented with special emphasis on its performance in disruptive shots.

Research paper thumbnail of Dimensionality reduction for high dimensional data

Proceedings of the 2014 International Conference on Information and Communication Technology for Competitive Strategies - ICTCS '14, 2014

Research paper thumbnail of A concept of out degree in CFG for optimal test data using genetic algorithm

2012 1st International Conference on Recent Advances in Information Technology (RAIT), 2012

Research paper thumbnail of Tool Condition Monitoring in Microturning of Aluminium Alloy Using Multiple Sensors

Applied Mechanics and Materials, 2014

Research paper thumbnail of RF-CePal: A universal remote control based on MEMS accelerometer

2010 Sixth International conference on Wireless Communication and Sensor Networks, 2010

RF-CePal' is networked sensor device to assist people with restricted finger movements. Many elec... more RF-CePal' is networked sensor device to assist people with restricted finger movements. Many electrical/electronic equipment can be operated using IR based remote control. As these remote controls take user input using push buttons, persons with restricted finger movement (e.g those with cerebral palsy) cannot operate such equipment. Taking advantage of MEMS accelerometer, we recognize gross movements of hand and map them to important functions of the equipment to be operated. We had earlier developed a device in which IR transmitter was integrated in the device along with sensor. However many users have problem pointing it towards the equipment to operate it reliably. In this paper, we report our work on developing a two part networked system communicating via zigbee based wireless link to overcome this difficulty. First part of the device(body device) containing sensor is placed on the body part (e.g hand/wrist) and the other part (base device) is pointing in direction of IR receiver of equipment. Tilt angle of hand is used as input to device (e.g left tilt changes the channel on TV). Based on preliminary trials, we have made design modifications to make the system more suitable and cheaper. This system is now being made available to users.

Research paper thumbnail of Dynamic Modulation Scaling for Energy Efficient Topology Control of Wireless Sensor Networks

Wireless communication is the most energy expensive operation for energy constrained wireless sen... more Wireless communication is the most energy expensive operation for energy constrained wireless sensor networks. Different topology structures require different transmission power levels in order to maintain wireless connectivity between the nodes. For a highly energy constrained network like Wireless Sensor Network ( WSN) it is highly desired to have such a topology which will need less transmission power for network connectivity purpose. Dynamic modulation scaling (DMS) is a technique useful for optimizing transmission energy with respect to number of packets that need to be transmitted at that particular time intervals. In general, DMS trades off transmission energy against transmission delays. Multilevel (M-ary) modulation is the key aspect for dynamic modulation scaling. Dynamically varying the constellation size b (number of bits per symbol) with respect to number of packets that need to be transmitted helps in optimizing transmission power. In this scenario it is very important to decide minimum and maximum bounds on constellation size (scale of modulation) otherwise it may result in performance degradation. In this paper various factors affecting minimum and maximum limit of b are discussed and it is shown that the individual node can decide minimum limit on b but for deciding maximum limit it needs to consider network aspects such as network topology, node density, location of particular node etc. Only proper selection of these limits results in optimized power consumption with satisfactory performance. Otherwise trying to save energy without satisfying performance parameters will require retransmission and the energy cost for that will be much higher than what was saved earlier. In this paper we have focused on calculating the bounds on values of b for cluster base network topology. We have proposed effective cluster based topology generation mechanism with DMS to optimize transmission energy. Our objective here is to optimize the average transmission energy of deployed WSN through clustering, intra-cluster leveling and DMS for overall energy effectiveness of the network.

Research paper thumbnail of Power and Buffer Overflow Optimization in Wireless Sensor Nodes

Prolonging the life span of the network is the prime focus in highly energy constrained wireless ... more Prolonging the life span of the network is the prime focus in highly energy constrained wireless sensor networks. Sufficient number of active nodes can only ensure proper coverage of the sensing field and connectivity of the network. If most of the nodes get their batteries depleted then it is not possible to maintain the network. In order to have long lived network it is mandatory to have long lived sensor nodes and hence power optimization at node level becomes equally important as power optimization at network level. In this paper need for a dynamically adaptive sensor node is signified in order to optimize power at individual nodes. We have analyzed a wireless sensor node using queuing theory. A sensor node is looked upon as a tandem queue in which first server is the processor or micro controller and the second server in series is the transmitter. Both the servers have finite and very small buffers associated with them as the sensor nodes are tiny devices and have very limited hardware. In this paper we have analyzed and simulated sensor node models. First we have considered a sensor node working with fixed service rate (processing rate and transmission rate). Secondly we have considered an adaptive sensor node which is capable of varying its service rates as per the requirement and ensure the quality of service. We have simulated both the models using MATLAB and compared their performances like life time, power consumption, buffer overflow probability and idle time etc. We have compared the performances of both the models under normal work loads as well as when the catastrophe (heavy wok load) occurs. In both the situations an adaptive service model out performs the fixed service model as it saves the power during normal period and increases the lifetime and during catastrophe period it consumes more power but ensures the QoS (Quality of Service) by reducing the overflow probability.

Research paper thumbnail of Effect of network coding on buffer management in wireless sensor network

Intelligent Sensors, Sensor Networks and Information Processing Conference, 2008

In resource constrained wireless sensor networks (WSN), it is highly desirable to make efficient ... more In resource constrained wireless sensor networks (WSN), it is highly desirable to make efficient use of available buffer. Hence for the WSN designed for the monitoring applications, buffer management is a key requirement at sensor nodes. We have proposed an efficient buffer management scheme based on random linear network coding as the in-network processing on data packets. With buffer allocation from source to sink path, our scheme distributes the buffer requirement among the nodes on the path. Further in the case of a packet loss, the proposed scheme recovers packet from available information distributed on the path from source to sink. We have compared our scheme with conventional buffer management scheme. Results show that network coding based buffer management scheme has better buffer availability with less redundancy and reduced loss recovery cost.

Research paper thumbnail of Sensor networks to monitor quality of life in rural area

In this paper, we examine the possibility of Sensor Networks being used to monitor various parame... more In this paper, we examine the possibility of Sensor Networks being used to monitor various parameters, which affect quality of life in rural India and thereby provide an opportunity to improve the quality of life. Quality of life of human beings in rural area is integrated with that of ...

Research paper thumbnail of Co-Ordinated Adaptive Power (CAP) Managemet for Wireless Sensor Networks

2007 International Conference on Sensor Technologies and Applications (SENSORCOMM 2007), 2007

Abstract In order to have energy optimized sensor nodes a low power hardware design is the basic ... more Abstract In order to have energy optimized sensor nodes a low power hardware design is the basic requirement, on that low power device applying sleep scheduling algorithms further energy savings can be achieved. CAP ie co-ordinated adaptive power ...

Research paper thumbnail of Topology control algorithm for IEEE 802.15.4 based single sink wireless sensor networks

2011 Fifth IEEE International Conference on Advanced Telecommunication Systems and Networks (ANTS), 2011

IEEE 802.15.4 is a communication standard specifically designed, targeting resource constrained n... more IEEE 802.15.4 is a communication standard specifically designed, targeting resource constrained networks. IEEE 802.15.4 provides MAC and Physical layer specifications for low power personal area networks like wireless sensor networks. IEEE 802.15.4 is designed considering the energy concerns of network devices normally called sensor nodes in wireless sensor networks. As per the standard network nodes are categorized as Full Function

Research paper thumbnail of Optimizing Power and Buffer Congestion on Wireless Sensor Nodes Using CAP (Coordinated Adaptive Power) Management Technique

International Journal of Wireless & Mobile Networks, 2011

Limited hardware capabilities and very limited battery power supply are the two main constraints ... more Limited hardware capabilities and very limited battery power supply are the two main constraints that arise because of small size and low cost of the wireless sensor nodes. Power optimization is highly desired at all the levels in order to have a long lived Wireless Sensor Network (WSN). Prolonging the life span of the network is the prime focus in highly energy constrained wireless sensor networks. Sufficient number of active nodes can only ensure proper coverage of the sensing field and connectivity of the network. If large number of wireless sensor nodes get their batteries depleted over a short time span then it is not possible to maintain the network. In order to have long lived network it is mandatory to have long lived sensor nodes and hence power optimization at node level becomes equally important as power optimization at network level. In this paper need for a dynamically adaptive sensor node is signified in order to optimize power at individual nodes along with the reduction in data loss due to buffer congestion. We have analyzed a sensor node with fixed service rate (processing rate and transmission rate) and a sensor node with variable service rates for its power consumption and data loss in small sized buffers under varying traffic (workload) conditions. For variable processing rate Dynamic Voltage Frequency Scaling (DVFS) technique is considered and for variable transmission rate Dynamic Modulation Scaling (DMS) technique is considered. Comparing the results of a dynamically adaptive sensor node with that of a fixed service rate sensor node shows improvement in the lifetime of node as well as reduction in the data loss due to buffer congestion. Further we have tried to coordinate the service rates of computation unit and communication unit on a sensor node which give rise to Coordinated Adaptive Power (CAP) management. The main objective of CAP Management is to save the power during normal periods and reduce the data loss due to buffer congestion (overflow) during catastrophic periods. With CAP management we are trying to adaptively change the power consumption of sensor nodes. Power consumption of processing unit and communication unit are coordinated together and changed adaptively with respect to the workload. Coordination between processing and communication subunits results in better energy optimization as well as possible data loss before transmission because of limited buffer sizes can be avoided.

Research paper thumbnail of CAP (Coordinated Adaptive Power) Management Technique with Adaptive Threshold Policy for Wireless Sensor Nodes

Proceedings of the Asia-Pacific Advanced Network, 2011

Research paper thumbnail of EPCAP: Explicit Prioritized Channel Access Protocol for IEEE 802.15.4 based Wireless Sensor Networks

2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013

ABSTRACT IEEE 802.15.4 is a communication standard specifically designed targeting low power pers... more ABSTRACT IEEE 802.15.4 is a communication standard specifically designed targeting low power personal area networks. It provides MAC and Physical layer specifications for resource constrained networks like Wireless Sensor Networks(WSN). IEEE 802.15.4 MAC specification targets fairness as one of the design considerations. That creates a problem when IEEE 802.15.4 MAC is used for event driven WSN applications. For an example, in a WSN deployed to detect a forest fire an event of fire requires higher preferences than routine updates. To target this limitation, we have extended channel access mechanism of IEEE 802.15.4 MAC in the form of prioritized channel access mechanism namely Explicit Prioritized Channel Access Protocol (EPCAP). EPCAP adds different priority levels to IEEE 802.15.4 MAC to handle critical events. Further, we have modeled EPCAP as M/G/c multi-server queueing system. To show the effectiveness of our mechanism we have simulated and compared it with standard protocol.

Research paper thumbnail of Context Aware Middleware Architecture for Wireless Sensor Network

2009 IEEE International Conference on Services Computing, 2009

Wireless sensor networks are application specific, data centric networks where different applicat... more Wireless sensor networks are application specific, data centric networks where different applications run on deployed network. Each application interprets the underlying sensor network differently and each changing event has different effect on running applications. In this paper we have proposed context aware middleware architecture called as 'MidSen'. This architecture bridges the gap between multiple applications running at application level and deployed sensor networks. MidSen architecture handles static as well as dynamically changing network and application components. MidSen has adopted a rule based engine to handle system dynamics. Midsen makes applications flexible by allowing them to update their rules against knowledge base. Our experimental results show that proposed Context Aware Service Discovery (CASD) algorithm gives better recall value and precision compare to previously proposed discovery algorithms.

Research paper thumbnail of Intra-Cluster Topology Creation in Wireless Sensor Networks

2007 Third International Conference on Wireless Communication and Sensor Networks, 2007

Clustering is proven method for energy efficient control mechanisms through which WSN creates con... more Clustering is proven method for energy efficient control mechanisms through which WSN creates connected topology generation. However, in cluster formation high focus hierarchical network topology.

Research paper thumbnail of Bounds on Dynamic Modulation Scaling for Wireless Sensor Networks

2007 Third International Conference on Wireless Communication and Sensor Networks, 2007

Wireless communication is the most energy expensive operation for energy constrained wireless sen... more Wireless communication is the most energy expensive operation for energy constrained wireless sensor networks. Dynamic modulation scaling (DMS) is a technique useful for optimizing transmission energy with respect to number of packets that need to be transmitted at that particular time intervals. In general, DMS trades off transmission energy against transmission delays. Multilevel (M-ary) modulation is the key aspect for

Research paper thumbnail of Prioritized IEEE 802.15.4 for wireless sensor networks

2010 Wireless Advanced 2010, 2010

Abstract Wireless Sensor Network is application specific data centric networks, having applicatio... more Abstract Wireless Sensor Network is application specific data centric networks, having application span ranging from house hold application to mission critical applications. Applications like fire detection require immediate attention from the base station. Further ...

Research paper thumbnail of Optimized Rumor routing algorithm for Wireless Sensor Networks

2009 Fifth International Conference on Wireless Communication and Sensor Networks (WCSN), 2009

Wireless Sensor Network is data centric network that works on query reply mechanism with various ... more Wireless Sensor Network is data centric network that works on query reply mechanism with various types of quires. Rumor routing is on of the data centric routing algorithm for Wireless Sensor Networks. Literature shows that Rumor routing algorithm is energy efficient than the Ant ...

Research paper thumbnail of A survey: Topology control for wireless sensor networks

Signal Processing, Communications …, 2008

Wireless sensor network is a densely deployed resource stress network where each small chunk of r... more Wireless sensor network is a densely deployed resource stress network where each small chunk of resource adds the high value to over all network functionality. Topology control is a technique through which network controls it's dense deployment for efficient resource utilization. ...

Research paper thumbnail of Vacuum photodiode detectors for broadband vacuum ultraviolet detection in the Saha Institute of Nuclear Physics Tokamak

Review of Scientific Instruments, 1997

We report on the application of the vacuum photodiode to detect vacuum ultraviolet ͑VUV͒ radiatio... more We report on the application of the vacuum photodiode to detect vacuum ultraviolet ͑VUV͒ radiation emitted from the Saha Institute of Nuclear Physics ͑SINP͒ Tokamak. It is simple to fabricate and provides broadband spectral response in the VUV and ultrasoft x ray ͑10 eV-1 keV͒. In our design, a stainless steel photocathode is used, which has a response identical to tungsten in the wavelength range 100-1200 Å. Its surface is passivated, to minimize contamination and monolayer deposition, by electropolishing it. Some representative experimental results illustrating the range of applicability are presented with special emphasis on its performance in disruptive shots.

Research paper thumbnail of Dimensionality reduction for high dimensional data

Proceedings of the 2014 International Conference on Information and Communication Technology for Competitive Strategies - ICTCS '14, 2014

Research paper thumbnail of A concept of out degree in CFG for optimal test data using genetic algorithm

2012 1st International Conference on Recent Advances in Information Technology (RAIT), 2012

Research paper thumbnail of Tool Condition Monitoring in Microturning of Aluminium Alloy Using Multiple Sensors

Applied Mechanics and Materials, 2014

Research paper thumbnail of RF-CePal: A universal remote control based on MEMS accelerometer

2010 Sixth International conference on Wireless Communication and Sensor Networks, 2010

RF-CePal' is networked sensor device to assist people with restricted finger movements. Many elec... more RF-CePal' is networked sensor device to assist people with restricted finger movements. Many electrical/electronic equipment can be operated using IR based remote control. As these remote controls take user input using push buttons, persons with restricted finger movement (e.g those with cerebral palsy) cannot operate such equipment. Taking advantage of MEMS accelerometer, we recognize gross movements of hand and map them to important functions of the equipment to be operated. We had earlier developed a device in which IR transmitter was integrated in the device along with sensor. However many users have problem pointing it towards the equipment to operate it reliably. In this paper, we report our work on developing a two part networked system communicating via zigbee based wireless link to overcome this difficulty. First part of the device(body device) containing sensor is placed on the body part (e.g hand/wrist) and the other part (base device) is pointing in direction of IR receiver of equipment. Tilt angle of hand is used as input to device (e.g left tilt changes the channel on TV). Based on preliminary trials, we have made design modifications to make the system more suitable and cheaper. This system is now being made available to users.