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Experience with Disconnected Operation in a Mobile Computing Environment [chapter]

M. Satyanarayanan, James J. Kistler, Lily B. Mummert, Maria R. Ebling, Puneet Kumar, Qi Lu
The Kluwer International Series in Engineering and Computer Science  
In this paper we present qualitative and quantitative data on file access in a mobile computing environment.  ...  This information is based on actual usage experience with the Coda File System over a period of about two years. Our experience confirms the viability and effectiveness of disconnected operation.  ...  Qualitative Evaluation The nature of our testbed environment has meant that we have more experience with voluntary than with involuntary disconnected operation.  ... 
doi:10.1007/978-0-585-29603-6_20 dblp:conf/mobidata/SatyanarayananK94 fatcat:qzz5ylc2tzfadcamrujy5jrocy

Communication Disconnection Prevention System by Bandwidth Depression-Type Traffic Measurement in a Multi-Robot Environment using an LCX Network

Kei Sawai, Satoshi Aoyama, Takumi Tamamoto, Tatsuo Motoyoshi, Hiroyuki Masuta, Ken'ichi Koyanagi, Toru Oshima
2019 International Journal of Advanced Computer Science and Applications  
CONCLUSION In this paper, as a method to prevent disconnection in remote operator-mobile robot communication due to bandwidth compression assuming a multi-robot environment constructed using LCX, a bandwidth  ...  Tele-operation of mobile robots using an LCX network is more effective as an information collection method in closed spaces compared with existing methods in terms of the maintenance of the mobile robots  ...  experiments in a real environment.  ... 
doi:10.14569/ijacsa.2019.0100714 fatcat:eduwuel3knhbxiwfgaggbn4uxu

Supporting Disconnected Operations in Mobile Computing

J.H. Abawajy, M. Mat deris
2006 IEEE International Conference on Computer Systems and Applications, 2006.  
important in an environment with low-qualiy cornmrtnication linkr.  ...  Mobile computing has enabled users to seamlessly access databases even when the/ are on the move. However, in lhe absence ofreadilv available highquali!  ...  The key characteristic of mobile computing environments is that end systems experience differing degrees of connectivity during typical operational cycles.  ... 
doi:10.1109/aiccsa.2006.205197 dblp:conf/aiccsa/AbawajyD06 fatcat:z6jqs6ass5crtboq73j5lqfog4

Performance Evaluation of Transaction Processing in Mobile Data Base Systems

Ahmad Al-Qerem
2014 International Journal of Database Management Systems  
Specific characteristics of mobile environments make traditional transaction management techniques no longer appropriate.  ...  In this paper we evaluate our execution framework on different mobile computation modes using different execution strategies.  ...  ACKNOWLEDGEMENTS This research is funded by the Deanship of Research and Graduate Studies in Zarqa University /Jordan  ... 
doi:10.5121/ijdms.2014.6202 fatcat:ku53er2v6rg7jadir5qorzzqgu

Disconnected Operation Service in Mobile Grid Computing [chapter]

Sang-Min Park, Young-Bae Ko, Jai-Hoon Kim
2003 Lecture Notes in Computer Science  
Among these issues to solve, we particularly focus on a disconnected operation problem in this paper since mobile resources are prone to frequent disconnections due to their confined communication range  ...  In this paper, we discuss on the extension of grid computing systems in mobile computing environments, where mobile devices can be effectively incorporated into the grid either as service recipients or  ...  In the simulation, the disconnection and reconnection of a mobile node is governed by Poisson process with the rate of λ and µ, respectively. We perform experiments on the implemented prototype.  ... 
doi:10.1007/978-3-540-24593-3_34 fatcat:y5x5g2wv5bf6ph37u76i3dcczy

Dynamic adaptation of network connections in mobile environments

J.S. Hansen, T. Riech, B. Andersen, E. Jul
1998 IEEE Internet Computing  
In general, support for mobile computing is poorly integrated in operating systems and network software. In this article, we discuss some of these problems.  ...  S oftware engineers who want to migrate existing applications from fully connected environments to mobile environments face a significant problem in obtaining and maintaining network connectivity.  ...  With TCP, the primary problem during disconnected operation is that the TCP connection may be closed down by a connection time-out.  ... 
doi:10.1109/4236.656070 fatcat:r4vbqnoojzdm3hmntftzpjs7vm

An Evaluation of Real-Time Transaction Management Issues in Mobile Database Systems

E. Kayan
1999 Computer journal  
However, it is difficult to handle real-time constraints in a mobile computing environment due to the physical constraints imposed by the mobile computer hardware and the wireless network technology.  ...  such as the number of mobile hosts in the system, the handoff process, disconnection, coordinator site relocation and wireless link failure.  ...  This modified version, which is described in [15] , adapts 2PC to a mobile computing environment.  ... 
doi:10.1093/comjnl/42.6.501 fatcat:eofrnidpeff3ralx4kwh5at7rm

Comparison Study of Commit Protocols for Mobile Environment

Bharati Harsoor, Dr.S.Ramachandram
2012 International Journal of Advanced Computer Science and Applications  
This approach deals with the frequency disconnections and the movement of mobile devices.  ...  The paper surveys different approaches proposed for mobile transaction and outline how the conventional commitment are revisited in order to fit the needs of mobile environment.  ...  Mobility and disconnected computing are two major issues in such environment.  ... 
doi:10.14569/ijacsa.2012.030938 fatcat:2cnjy4wicbauhfqyclnaok3rqa

A Novel Data Replication and Management Protocol for Mobile Computing Systems

J. H. Abawajy, M. Mat Deris, M. Omar
2006 Mobile Information Systems  
very important in an environment with low-quality communication links.  ...  given time, thus giving the technique flexibility in mobile environments.  ...  An involuntary disconnection can occur in a mobile computing environment when there is a temporary impediment to communication.  ... 
doi:10.1155/2006/930587 fatcat:yy6l22aioffvleai74udojlgui

Application Research of Mobile Database Model Based on Ad Hoc Network

Ying Qi, Tao Zhang
2016 International Journal of Database Theory and Application  
rise in failure or error rate of transactions, increase in false transaction operations, even cause breakdown of the entire network because of long time disconnection with the master server.  ...  cost with the remote server is high, and disconnections with remote server often occur.  ...  4.2.1, in the same operating environment, a comparison of average completion time has been made between the traditional mobile database model and the new mobile database model.  ... 
doi:10.14257/ijdta.2016.9.2.18 fatcat:wxa6enozcbh3jhgwhrarzyr7sa

The 3DMA Middleware for Mobile Applications [chapter]

Tore Fjellheim, Stephen Milliner, Marlon Dumas, Kim Elms
2004 Lecture Notes in Computer Science  
combined with a set of "workers" which are able to act on the users behalf either to reduce load on the mobile device, or to support disconnected behavior.  ...  Mobile devices have received much research interest in recent years. Mobility raises new issues such as more dynamic context, limited computing resources, and frequent disconnections.  ...  It supports the publish/subscribe pardigm which has prooven useful for disconnected operation in mobile environments [2] .  ... 
doi:10.1007/978-3-540-30121-9_30 fatcat:zz4vq7kaizfatlfmgv3w2pbomy

Towards Context-Aware Ubiquitous Transaction Processing: A Model and Algorithm

Feilong Tang, Song Guo, Minyi Guo, Minglu Li, Cho-li Wang
2011 2011 IEEE International Conference on Communications (ICC)  
Transaction management for mobile and ubiquitous computing aims at providing mobile users with reliable services in a transparent way anytime anywhere.  ...  To make such a vision a reality, transaction processing for the mobile and ubiquitous computing needs to adapt to the runtime environments dynamically.  ...  In this experiment, we varied the number of interaction operations in MUC transactions from 1 to 7 with the increment of 1 to evaluate the performance impact of the number of interaction operations.  ... 
doi:10.1109/icc.2011.5963475 dblp:conf/icc/TangGGLW11 fatcat:7ihi2a4msrcsxhekowwourjcva

"Tour de France" data for the improvement of energy consumption in devices powered by limited energy sources

HAMZAOUKhalil Ibrahim, DAHMANI Soufiane, BOULET Pierre
2020 Data in Brief  
In this article, we propose a dataset about the energy consumption of mobile devices that was collected as part of a "Tour de France" with an electrical wheelchair.  ...  Based on these precise measurements in a real environment, we have elaborated predictive models of energy consumption.  ...  These measures were operated out in a real environment and confronted with the consumption measures carried out beforehand in a controlled environment.  ... 
doi:10.1016/j.dib.2020.106334 pmid:33072823 pmcid:PMC7548955 fatcat:pfich3gpzneihk7l5hwln4qffy

Building information systems for mobile environments

Evaggelia Pitoura, Bharat Bhargava
1994 Proceedings of the third international conference on Information and knowledge management - CIKM '94  
appropriate for mobile environments.  ...  , the mobility and the vulnerability of the wireless environment.  ...  to it or totally disconnected from it) in a mobile environment there arc more modes of operation.  ... 
doi:10.1145/191246.191310 dblp:conf/cikm/PitouraB94 fatcat:rbtfc5ytnbbqllgxil5mks7j6q

A Transaction Processing Model for the Mobile Data Access System [chapter]

K. Segun, A. R. Hurson, A. Spink
2001 Lecture Notes in Computer Science  
As a result, software applications have to be redesigned to take advantage of this environment while accommodating the new challenges posed by mobility.  ...  Advances in wireless networking technology and portable computing devices have led to the emergence of a new computing paradigm known as mobile computing and a number of applications.  ...  The mobile computing environment is a distributed computing platform with the following differences: the mobility of users and their access devices, frequent disconnection, limited bandwidth and the mobile  ... 
doi:10.1007/3-540-44743-1_11 fatcat:iahaxvienzexpedy44fakfcf3m
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