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Network Technologies & Communications (NTC 2010)

Academic Conferences - Network Technologies & Communications (NTC 2010)
Academic Conferences

By : Global Science & Technology Forum

Date : 2010

Location : Thailand / Phuket

PDF 82p
Description :

This conference focused on the demand for network technologies and communications. How the industry responded to this demand with the emergence of 3G and 4G, WiFi and WiMax, Bluetooth and Zigbee, Ultrawideband and TV-band, Powerline and Free space optical.

Keywords :

Ad hoc Networks, Multicast Routing, QoS, Quality of Service, Multistage interconnection network, MIN, Plus Minus 2i network, mathematical modeling, linear Lyapunov function, Neuron, PLC, femtocell, LTE-advanced, Multivariate predictive modeling, Round Trip Time, RTT, Receive Signal Strength Indicator, RSSI, LEDBAT, Low Extra Delay Background Transport

Keywords inside documents :

network ,routing ,nodes ,ledbat ,route ,delay ,protocol ,packet ,system ,source ,congestion ,networks ,number ,stations ,cluster ,proposed ,control ,responses ,station ,mobile

Product/ documentation details
Performance Analysis of LEDBAT in the Presence of....

Company Description : Low Extra Delay Background Transport (LEDBAT) is a novel one-way delay Internet congestion control algorithm developed to react to congestion earlier than any ofthe loss-based TCP congestion control algorithms (e.g. TCPNewReno).A LEDBAT source quickly reduces its sending rate when the queue delay experienced in its path is greater thana fixed pre-defined target value. This paper analyses LEDBAT when it is sharing a bottleneck link with TCP. Our analysis identifies the threshold of a bottle neck buffer size that leads LEDBAT to revert to a minimum congestion window of only 1packet in the presence of TCP. That is, for some application sits through put will be too low. In addition to the fact that intra protocol unfairness among multiple LEDBAT sources may occur when using the fixed minimum LEDBAT congestion window to improve the limited LEDBAT throughput, we show that the average LEDBAT throughput is fixed even as the bottleneck link capacity increases as opposed to TCP throughput that increases proportionally. This therefore necessitates the need for a dynamic minimum congestion window in the LEDBAT algorithm.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

The demand for network technologies and communications is large and growing rapidly. Networking should be on-demand, with whomever or whatever they want, regardless of time or location. To meet these requirements, industry has invested heavily in a variety of wireless and wireline communications technologies, each with its own strengths and weaknesses. In recent times, we have seen the emergence of 3G and 4G, WiFi and WiMax, Bluetooth and Zigbee, Ultrawideband and TV-band, Powerline and Free space optical.


Proceedings from the Network Technologies & Communications (NTC 2010) conference.

Abstracts from papers available from The Network Technologies & Communications (NTC 2010) conference.

 

1. A Novel QoS Multicast Routing Protocol in MANETs

Mohammad M. Qabajeh,Department of Electrical and Computer Engineering
IIUM, Malaysia

Aisha H. Abdalla,Department of Electrical and Computer Engineering
IIUM, Malaysia
Othman Khalifa, Department of Electrical and Computer Engineering
IIUM, Malaysia

 

Multicast routing protocols becomes increasingly important in Mobile Ad hoc Networks (MANET) because they effectively coordinate a set of nodes. Meanwhile, multimedia applications become essential need for users of MANET. Such applications are highly demand for Quality of Service (QoS), which makes an efficient QoS multicast routing protocols is very important. In this work we proposed a new position-based QoS multicast routing protocol (PBQMRP). This approach is formed by partitioning the physical area is into equal size hexagonal cells and electing a leader and backup leader nodes for each cell. Efficient routing is performed based on nodes positions to deliver the data to all the receivers. The simulation results show that, comparing with the well-known multicast protocol ODMRP (Demand Multicast Routing Protocol), PBQMRP achieves higher packet delivery ratio with reduced control overhead.


2. A Scalable and Secure Position-Based Routing Protocol for MANETs

Liana Khamis Qabajeh, Faculty of Computer Science and IT, University of Malaya, Kuala Lumpur, Malaysia

Miss Laiha Mat Kiah, Faculty of Computer Science and IT, University of Malaya, Kuala Lumpur, Malaysia

Mobile Ad-Hoc Networks (MANETs) are becoming increasingly applicable in different fields. Securing MANETs routing protocols is considered as one of the most difficult areas to deal with as opponents can add themselves to a MANET using the existing common routing protocols. This paper proposes a new routing protocol; ARANz, which is an extension of the original Authenticated Routing for Ad-Hoc Networks (ARAN). Apart from the authentication methods adopted from ARAN, ARANz aims to increase security, achieve robustness and solve the single point of attack and failure problems by introducing multiple local certificate authority servers. Via dealing with the network as zones and using restricted directional flooding, our new model exhibits better scalability and performance. Through simulation we evaluated ARANz and compared it with the original ARAN.Simulation results show that ARANz is able to effectively and efficiently discover secure routes within relatively large networks with large number of mobile nodes.


3. A New Optical Switching Network Architecture with  Crosstalk Free And Nonblocking Routing Algorithm

Manjur Ahmed, School of Computer and Communication Engineering
Universiti Malaysia Perlis (UniMAP), Malaysia

Mostafijur Rahman, School of Computer and Communication Engineering
Universiti Malaysia Perlis (UniMAP), Malaysia

Ahmad Nasir Che Rosli,School of Computer and Communication Engineering
Universiti Malaysia Perlis (UniMAP), Malaysia

M.M. Hafizur Rahman, Department of Computer Science and Engineering
Khulna University of Engineering and Technology (KUET), Bangladesh

Fareq Malek, School of Computer and Communication Engineering
Universiti Malaysia Perlis (UniMAP), Malaysia

Md.Sakoat Hossen, Department of Computer Science and Engineering
Khulna University of Engineering and Technology (KUET), Bangladesh

R. B. Ahmad, School of Computer and Communication Engineering
Universiti Malaysia Perlis (UniMAP), Malaysia

 

A  new multistage  interconnection  network  have been proposed with a suitable and straight forward routing algorithm  that  can  realize  input  to  output  in  a  single  pass and crosstalk free for any permutation. The switch network is  wide  sense  nonblocking  characteristics.  The  proposed network  can be  extended  for  large N×N network. We have also  focused  the  appropriate  routing  algorithm  of the proposed  network.  A  graphical  representation/simulation has been given for analyzing nonblocking and crosstalk free characteristics with single pass of the proposed network.


4. Modeling road traffic networks for control

T. PETER, Department of Control and Transport Automation, Budapest University of Technology and Economics (BME) Budapest, Hungary

J. BOKOR, Department of Control and Transport Automation, Budapest University of Technology and Economics (BME), Budapest, Hungary

 

This paper introduces a method of mathematical modeling of high scale road traffic networks. The elaborated model is in state space form where the states are vehicle densities on a particular lane and the dynamics is described by a non linear state constrained positive system. This model can be used directly for simulation and analysis and as a starting point for investigating various control strategies. Stability of the traffic over the network can be analyzed by construction linear Lyapunov function and the associated theory.

 

5. Study and Implementation for the Architecture of LonTalk Protocol

Su Goog Shon , Soo Mi Yang, The University of Suwon, Bongdam-eup Wau-ri, San 2-2, Hwasung-city, Gyeonggi-do, Republic of Korea

Jae Jo Lee, Korea Electro technology Research Institute (KERI), Gyeonggi-do, 426-170, Republic of Korea

 

This paper presents a LonTalk protocol architecture that all the OSI 7 layers of the protocol can be implemented in one ARM processor, rather than using the Neuron chip using 3 processors. The data link, network, and application layer are implemented one processor. Especially, we discuss how to implement and test the data link layer of the LonTalk based on predictive p-persistent CSMA/CA. This research, as a conclusion, shows the improvement of performance and the compatibility with the existing Neuron chip.

 

6. Microwave Generation Based on an Inverse-Gaussian, Apodized Fiber Bragg Grating and a Semiconductor, Optical Amplifier Operating in Low-Gain Regime

Bo Lin, Photonics Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore

Swee Chuan Tjin, Photonics Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore

Han Zhang, Photonics Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore

Dingyuan Tang, Photonics Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore

Jianzhong Hao, Institute for Infocomm Research, 1 Fusionopolis Way, Singapore
Bo Dong, Institute for Infocomm Research, 1 Fusionopolis Way, Singapore

Sheng Liang, School of Instrument Science and Opto-electronics Engineering, Beihang University, China

 

A stable dual-wavelength erbium-doped fiber laser that can generate a microwave signal is presented. In the ringcavity, an inverse-Gaussian apodized fiber Bragg grating based dual-wavelength pass band filter, a semiconductor optical amplifier biased in low-gain regime, and a feedback fiber loop, guarantee a stable single-longitudinal-mode operation at each lasing line. A microwave signal at 12.51 GHz is obtained by beating the dual wavelengths at a photodetector. The proposed fiber laser can find potential applications in broadband wireless access network and optical sensing network.

 

7. Towards Stable Routes in Dense Manets

Sharmila Sankar, Computer Science & Engineering, B S Abdur Rahman University Chennai, India

Dr. V. Sanakaranarayanan, Director, University Project, B S Abdur Rahman University Chennai,India

 

On-demand routing protocol is an important category of the current ad-hoc routing protocols, in which a route between a communicating node pair is discovered only on demand. However, due to the dynamic and mobile nature of the nodes, intermediate nodes in the route tend to lose connection with each other during the communication process. When this occurs, most of the existing protocols perform an end-to-end route discovery to establish a new connection for the communication. Most of the protocol ad hoc routing algorithms initiate route discovery only after path breaks. Such route repair mechanism causes high control overhead and long packet delay in a dense network. In this paper, we propose an enhanced proactive route maintenance protocol, where in a node that is likely to cause link error, as a preventive measure, hands off routing information to a suitably situated node. The proposed protocol aims to reduce the probability of route breakage and hence reduces the control overhead and latency, and increases the packet delivery ratio. Through simulation, we show that the proposed protocol is simple, robust and effective.

 

8. A Base Station Co-operation Protocol for Indoor Base Stations

Akindele Segun AFOLABI, Graduate School of System Informatics,
Kobe University, Japan.

Chikara OHTA, Graduate School of System Informatics,
Kobe University, Japan.

Hisashi TAMAKI, Graduate School of System Informatics,
Kobe University, Japan.

 

This paper presents a co-operation protocol for indoor base stations in order to achieve a more efficient distribution of radio resources among neighboring indoor base stations. Indoor base stations are usually deployed by users in an ad-hoc manner which makes prior network planning by network operators impossible. If the same pool of radio resources (e.g channels) is used by close base stations, co-operation between these base stations is vital for resolving problems such as interference. In the proposed scheme, femtocell, which is a typical example of indoor base station, is considered. Femtocells in close proximity exchange UE-assisted (User Equipment) received reference power information, and based on individual position of each femtocell, inter-base station interaction is used to form clusters.In each cluster, the cluster-head (CH) uses resource allocation tables to assign frequency-channel resources to cluster-members(CM) in a distributed manner. This scheme helps to ensure that the interest of neighbor base stations is always considered whenever a base station makes use of the available network resources such as frequency-channels. Our simulation results show that a significant percentage of the indoor base stations in a wireless network could cooperate to form clusters if our proposed co-operation protocol is used.
 

9. Hybrid predictive modeling for multivariate responses

S. Tom Au, Rong Duan, AT&T Labs, Inc.-Research

Guangqin Ma, AT&T Labs, Inc.-Research

Rensheng Wang, AT&T Labs, Inc.-Research

 

In telecommunications service industry, a group of customers may be targeted for a set of marketing interests, and these interests are usually inter-correlated. For example, churn, up selling and appetency are often considered together, and decisions on how to retain customers, and to promote or to upgrade services are associated. Instead of predicting them separately as univariate models, we propose an adaptive procedure to model multiple responses prediction into correlated multivariate predicting scheme. This adaptive procedure utilizes the correlation structure of the predictorsand the responses to enhance the prediction iteratively.This proposed method combines partial least squares (PLS) method and logistic regressions, in which the former is used to extract the mutual information from correlations, while the latter is utilized to refine every single response prediction through auxiliary information from PLS predictions.

 

10. Wireless Device Location Sensing In a Museum Project

Tanvir Anwar, Sydney, Australia
Dr. Priyadarsi Nanda, School of Computing and Communications, Faculty of Engineering and IT, University of Technology, Sydney, Australia


Indoor navigation can be implemented with Bluetooth technology as sensors. We use RTT(Round Trip Time) as an attribute towards the navigation of an object. Designing the scheme for indoor networks with the introduction of pre-fixed co-ordinates hasbeen used as a database. This paper presents a new algorithm that incorporate real lifesignal strength measurement from accesspoint and peers to estimate position and distance using Bluetooth sensor network. The main feature of this paper is to see how RTT behaves with distance and then what approach we must take to make RTT morerobust. We conducted several experiments to validate our proposed algorithm and study RTT behavior in real life application.
 

11. Efficiency development of performance management system for base stations

Narangsan Suracharoenchaikul, Department of Engineering Management (Information and Communication Technology) Srinakharinwirot University, Thailand

Namkhun Srisanit, Department of Engineering Management (Information and Communication Technology) Srinakharinwirot University, Thailand

 

The objective of this research is to automatically check percentage of complete data, recover data and send the result alert and report the processing to staff. The process is consisted of four parts as follows:

1. Checking the completion of final data (Pcal) threshold percentage,

2. Checking the cause of incomplete data from source data until the final process of the performance management system is reached,

3. Reprocessing from the problem of the performance management system and

4. Sending the alert or report to staff.


The results of this research show that it can automatically fix, reduce data percentage error from the processes of the performance management system and decrease staff’s time to check and fix this problem.

 

12. A hash-free overlay with eventually optimal locality

Martin Raack, Technische Universit¨at Berlin Complex and Distributed IT Systems, Berlin, Germany

Christian Wuertz, Technische Universit¨at Berlin Complex and Distributed IT Systems, Berlin, Germany

Philipp Berndt, Technische Universit¨at Berlin Complex and Distributed IT Systems, Berlin, Germany

Odej Kao, Technische Universit¨at Berlin Complex and Distributed IT Systems, Berlin, Germany

A key property of efficient Peer-to-Peer (P2P) overlay networks is proximity awareness. Networks that setup theirrouting tables deterministically are in fact able to provide shortoverlay path lengths of O(log n), but the entire path latency tends to grow proportionally to the number of routing steps (hops). On the other hand, those networks that are capable of optimizing their network structure to prefer proximate nodes are able to provide low routing path latencies, independent of the actual number of hops. In this paper, we present a new proximity aware routing algorithm and discovery protocol for the overlay network Papnet[1]. In contrast to classic overlay networks, Papnet does notrely on the hashing of keys and allows for more sophisticated applications than a distributed hash-table (DHT).We show, that a hash-free network like Papnet can provide very low path latencies and compare it to the well known hash-based proximity-awareoverlay network Pastry. Moreover, we show that Papnet is able to guarantee eventual convergence to optimal routing tables, a property that has not been achieved in previous overlay networks.

 

13. Performance Analysis of LEDBAT in the Presence of TCP-Newreno

Amuda James Abu, Sirindhorn International Institute of Technology, Thammasat University, Pathumthani 12000, Thailand

Steven Gordon, Sirindhorn International Institute of Technology, Thammasat University, Pathumthani 12000, Thailand

 

Low Extra Delay Background Transport (LEDBAT) is a novel one-way delay Internet congestion control algorithm developed to react to congestion earlier than any ofthe loss-based TCP congestion control algorithms (e.g. TCPNewReno).A LEDBAT source quickly reduces its sending rate when the queue delay experienced in its path is greater thana fixed pre-defined target value. This paper analyses LEDBAT when it is sharing a bottleneck link with TCP. Our analysis identifies the threshold of a bottle neck buffer size that leads LEDBAT to revert to a minimum congestion window of only 1packet in the presence of TCP. That is, for some application sits through put will be too low. In addition to the fact that intra protocol unfairness among multiple LEDBAT sources may occur when using the fixed minimum LEDBAT congestion window to improve the limited LEDBAT throughput, we show that the average LEDBAT throughput is fixed even as the bottleneck link capacity increases as opposed to TCP throughput that increases proportionally. This therefore necessitates the need for a dynamic minimum congestion window in the LEDBAT algorithm.

 

14. Distributed Cache Framework and Its Data Procurement Algorithm on Global Data Grids

Byungsang Kim, School of Information and Communication Engineering, Korea Advanced Institute of, Science and Technology, Daejeon, Korea
Yougjoo Han, School of Information and, Communication Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea

Chan-Hyun Youn, School of Electrical and Electronic Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea

 

As the global grid has grown in size, large-scale distributed data analysis schemes have gained momentum. Over the last few years, a number of methods have been introduced for allocating data intensive tasks across distributed and heterogeneous computing platforms. However, these approaches have a limited potential for scaling up computing nodes so that they can serve more tasks simultaneously. This paper tackles the scalability problem in a user-centric task distribution overlay. We propose a distributed data cache framework for storing and allocating the tasks. This paper also provides task procurement algorithms based on the steady states of the distributed caches for maximizing the distribution efficiency between the data source and the computing nodes. The experimental results show that scalability and distribution efficiency can be achieved in our system.

 

15. Spanning a Global Delay Model from HTTP-Measurements

Philipp Berndt,Technische Universität Berlin, Complex and Distributed IT Systems, 10587 Berlin, Germany

Martin Raack, Technische Universität Berlin, Complex and Distributed IT Systems, 10587 Berlin, Germany

Odej Kao, Technische Universität Berlin, Complex and Distributed IT Systems, 10587 Berlin, Germany
 

Efficient realistic network models are fundament alto simulating distributed systems and protocols. The Delfoinetwork model divides the network into a location- and distance dependentbut (from the user’s perspective) stateless backbone part and a stateful local Internet access part. Its backbone characteristics are modeled by arranging all hosts into an dimensional delay space and interpolating delays from their distance, before adding regional jitter. The local characteristics are obtained from two queues modeling the send buffers withinthe local up- and down-link, i.e. DSL or cable modem and broadband remote access server, respectively. These models were parametrized from Internet speed data based on HTTP-probes, measured by millions of users and provided by speedtest.net.While proving the model’s concept, the results show how the observed heterogeneity of consumer Internet stretches basic GNP models to their limits.

A Novel QoS Multicast Routing Protocol in MANETs

Company Description : Multicast routing protocols becomes increasingly important in Mobile Ad hoc Networks (MANET) because they effectively coordinate a set of nodes. Meanwhile, multimedia applications become essential need for users of MANET. Such applications are highly demand for Quality of Service (QoS), which makes an efficient QoS multicast routing protocols is very important. In this work we proposed a new position-based QoS multicast routing protocol (PBQMRP). This approach is formed by partitioning the physical area is into equal size hexagonal cells and electing a leader and backup leader nodes for each cell. Efficient routing is performed based on nodes positions to deliver the data to all the receivers. The simulation results show that, comparing with the well-known multicast protocol ODMRP (Demand Multicast Routing Protocol), PBQMRP achieves higher packet delivery ratio with reduced control overhead.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

A Scalable and Secure Position-Based Routing Protocol for MANETs

Company Description : Mobile Ad-Hoc Networks (MANETs) are becoming increasingly applicable in different fields. Securing MANETs routing protocols is considered as one of the most difficult areas to deal with as opponents can add themselves to a MANET using the existing common routing protocols. This paper proposes a new routing protocol; ARANz, which is an extension of the original Authenticated Routing for Ad-Hoc Networks (ARAN). Apart from the authentication methods adopted from ARAN, ARANz aims to increase security, achieve robustness and solve the single point of attack and failure problems by introducing multiple local certificate authority servers. Via dealing with the network as zones and using restricted directional flooding, our new model exhibits better scalability and performance. Through simulation we evaluated ARANz and compared it with the original ARAN.Simulation results show that ARANz is able to effectively and efficiently discover secure routes within relatively large networks with large number of mobile nodes.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

A New Optical Switching Network Architecture with Crosstalk Free And Nonblocking Routing...

Company Description : A new multistage interconnection network have been proposed with a suitable and straight forward routing algorithm that can realize input to output in a single pass and crosstalk free for any permutation. The switch network is wide sense nonblocking characteristics. The proposed network can be extended for large N×N network. We have also focused the appropriate routing algorithm of the proposed network. A graphical representation/simulation has been given for analyzing nonblocking and crosstalk free characteristics with single pass of the proposed network.

Product Type : Academic Conferences

Author : Various

PDF 5p

Languages : English

Modeling road traffic networks for control

Company Description : This paper introduces a method of mathematical modeling of high scale road traffic networks. The elaborated model is in state space form where the states are vehicle densities on a particular lane and the dynamics is described by a non linear state constrained positive system. This model can be used directly for simulation and analysis and as a starting point for investigating various control strategies. Stability of the traffic over the network can be analyzed by construction linear Lyapunov function and the associated theory.

Product Type : Academic Conferences

Author : Various

PDF 5p

Languages : English

Study and Implementation for the Architecture of LonTalk Protocol

Company Description : This paper presents a LonTalk protocol architecture that all the OSI 7 layers of the protocol can be implemented in one ARM processor, rather than using the Neuron chip using 3 processors. The data link, network, and application layer are implemented one processor. Especially, we discuss how to implement and test the data link layer of the LonTalk based on predictive p-persistent CSMA/CA. This research, as a conclusion, shows the improvement of performance and the compatibility with the existing Neuron chip.

Product Type : Academic Conferences

Author : Various

PDF 4p

Languages : English

Microwave Generation Based on an Inverse-Gaussian, Apodized Fiber Bragg Grating...

Company Description : A stable dual-wavelength erbium-doped fiber laser that can generate a microwave signal is presented. In the ringcavity, an inverse-Gaussian apodized fiber Bragg grating based dual-wavelength pass band filter, a semiconductor optical amplifier biased in low-gain regime, and a feedback fiber loop, guarantee a stable single-longitudinal-mode operation at each lasing line. A microwave signal at 12.51 GHz is obtained by beating the dual wavelengths at a photodetector. The proposed fiber laser can find potential applications in broadband wireless access network and optical sensing network.

Product Type : Academic Conferences

Author : Various

PDF 4p

Languages : English

Towards Stable Routes in Dense Manets

Company Description : On-demand routing protocol is an important category of the current ad-hoc routing protocols, in which a route between a communicating node pair is discovered only on demand. However, due to the dynamic and mobile nature of the nodes, intermediate nodes in the route tend to lose connection with each other during the communication process. When this occurs, most of the existing protocols perform an end-to-end route discovery to establish a new connection for the communication. Most of the protocol ad hoc routing algorithms initiate route discovery only after path breaks. Such route repair mechanism causes high control overhead and long packet delay in a dense network. In this paper, we propose an enhanced proactive route maintenance protocol, where in a node that is likely to cause link error, as a preventive measure, hands off routing information to a suitably situated node. The proposed protocol aims to reduce the probability of route breakage and hence reduces the control overhead and latency, and increases the packet delivery ratio. Through simulation, we show that the proposed protocol is simple, robust and effective.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

A Base Station Co-operation Protocol for Indoor Base Stations

Company Description : This paper presents a co-operation protocol for indoor base stations in order to achieve a more efficient distribution of radio resources among neighboring indoor base stations. Indoor base stations are usually deployed by users in an ad-hoc manner which makes prior network planning by network operators impossible. If the same pool of radio resources (e.g channels) is used by close base stations, co-operation between these base stations is vital for resolving problems such as interference. In the proposed scheme, femtocell, which is a typical example of indoor base station, is considered. Femtocells in close proximity exchange UE-assisted (User Equipment) received reference power information, and based on individual position of each femtocell, inter-base station interaction is used to form clusters.In each cluster, the cluster-head (CH) uses resource allocation tables to assign frequency-channel resources to cluster-members(CM) in a distributed manner. This scheme helps to ensure that the interest of neighbor base stations is always considered whenever a base station makes use of the available network resources such as frequency-channels. Our simulation results show that a significant percentage of the indoor base stations in a wireless network could cooperate to form clusters if our proposed co-operation protocol is used.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

Hybrid predictive modeling for multivariate responses

Company Description : In telecommunications service industry, a group of customers may be targeted for a set of marketing interests, and these interests are usually inter-correlated. For example, churn, up selling and appetency are often considered together, and decisions on how to retain customers, and to promote or to upgrade services are associated. Instead of predicting them separately as univariate models, we propose an adaptive procedure to model multiple responses prediction into correlated multivariate predicting scheme. This adaptive procedure utilizes the correlation structure of the predictorsand the responses to enhance the prediction iteratively.This proposed method combines partial least squares (PLS) method and logistic regressions, in which the former is used to extract the mutual information from correlations, while the latter is utilized to refine every single response prediction through auxiliary information from PLS predictions.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

Wireless Device Location Sensing In a Museum Project

Company Description : Indoor navigation can be implemented with Bluetooth technology as sensors. We use RTT(Round Trip Time) as an attribute towards the navigation of an object. Designing the scheme for indoor networks with the introduction of pre-fixed co-ordinates hasbeen used as a database. This paper presents a new algorithm that incorporate real lifesignal strength measurement from accesspoint and peers to estimate position and distance using Bluetooth sensor network. The main feature of this paper is to see how RTT behaves with distance and then what approach we must take to make RTT morerobust. We conducted several experiments to validate our proposed algorithm and study RTT behavior in real life application.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

Efficiency development of performance management system for base stations

Company Description : The objective of this research is to automatically check percentage of complete data, recover data and send the result alert and report the processing to staff. The process is consisted of four parts as follows: 1. Checking the completion of final data (Pcal) threshold percentage, 2. Checking the cause of incomplete data from source data until the final process of the performance management system is reached, 3. Reprocessing from the problem of the performance management system and 4. Sending the alert or report to staff. The results of this research show that it can automatically fix, reduce data percentage error from the processes of the performance management system and decrease staff’s time to check and fix this problem.

Product Type : Academic Conferences

Author : Various

PDF 4p

Languages : English

A hash-free overlay with eventually optimal locality

Company Description : A key property of efficient Peer-to-Peer (P2P) overlay networks is proximity awareness. Networks that setup theirrouting tables deterministically are in fact able to provide shortoverlay path lengths of O(log n), but the entire path latency tends to grow proportionally to the number of routing steps (hops). On the other hand, those networks that are capable of optimizing their network structure to prefer proximate nodes are able to provide low routing path latencies, independent of the actual number of hops. In this paper, we present a new proximity aware routing algorithm and discovery protocol for the overlay network Papnet[1]. In contrast to classic overlay networks, Papnet does notrely on the hashing of keys and allows for more sophisticated applications than a distributed hash-table (DHT).We show, that a hash-free network like Papnet can provide very low path latencies and compare it to the well known hash-based proximity-awareoverlay network Pastry. Moreover, we show that Papnet is able to guarantee eventual convergence to optimal routing tables, a property that has not been achieved in previous overlay networks.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

Performance Analysis of LEDBAT in the Presence of....

Company Description : Low Extra Delay Background Transport (LEDBAT) is a novel one-way delay Internet congestion control algorithm developed to react to congestion earlier than any ofthe loss-based TCP congestion control algorithms (e.g. TCPNewReno).A LEDBAT source quickly reduces its sending rate when the queue delay experienced in its path is greater thana fixed pre-defined target value. This paper analyses LEDBAT when it is sharing a bottleneck link with TCP. Our analysis identifies the threshold of a bottle neck buffer size that leads LEDBAT to revert to a minimum congestion window of only 1packet in the presence of TCP. That is, for some application sits through put will be too low. In addition to the fact that intra protocol unfairness among multiple LEDBAT sources may occur when using the fixed minimum LEDBAT congestion window to improve the limited LEDBAT throughput, we show that the average LEDBAT throughput is fixed even as the bottleneck link capacity increases as opposed to TCP throughput that increases proportionally. This therefore necessitates the need for a dynamic minimum congestion window in the LEDBAT algorithm.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

Distributed Cache Framework and Its Data Procurement Algorithm on Global Data Grids

Company Description : As the global grid has grown in size, large-scale distributed data analysis schemes have gained momentum. Over the last few years, a number of methods have been introduced for allocating data intensive tasks across distributed and heterogeneous computing platforms. However, these approaches have a limited potential for scaling up computing nodes so that they can serve more tasks simultaneously. This paper tackles the scalability problem in a user-centric task distribution overlay. We propose a distributed data cache framework for storing and allocating the tasks. This paper also provides task procurement algorithms based on the steady states of the distributed caches for maximizing the distribution efficiency between the data source and the computing nodes. The experimental results show that scalability and distribution efficiency can be achieved in our system.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

Spanning a Global Delay Model from HTTP-Measurements

Company Description : Efficient realistic network models are fundament alto simulating distributed systems and protocols. The Delfoinetwork model divides the network into a location- and distance dependentbut (from the user’s perspective) stateless backbone part and a stateful local Internet access part. Its backbone characteristics are modeled by arranging all hosts into an dimensional delay space and interpolating delays from their distance, before adding regional jitter. The local characteristics are obtained from two queues modeling the send buffers withinthe local up- and down-link, i.e. DSL or cable modem and broadband remote access server, respectively. These models were parametrized from Internet speed data based on HTTP-probes, measured by millions of users and provided by speedtest.net.While proving the model’s concept, the results show how the observed heterogeneity of consumer Internet stretches basic GNP models to their limits.

Product Type : Academic Conferences

Author : Various

PDF 6p

Languages : English

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