Toward a Usage-Based Security Framework for Collaborative Computing Systems

2008 ◽  
Vol 11 (1) ◽  
pp. 1-36 ◽  
Author(s):  
Xinwen Zhang ◽  
Masayuki Nakae ◽  
Michael J. Covington ◽  
Ravi Sandhu
Keyword(s):  
Collaborative Computing ◽  
Security Framework ◽  
Computing Systems

scholarly journals Reputation management in collaborative computing systems

2009 ◽  
Vol 3 (6) ◽  
pp. 546-564 ◽  
Author(s):  
Alvaro E. Arenas ◽  
Benjamin Aziz ◽  
Gheorghe Cosmin Silaghi
Keyword(s):  
Reputation Management ◽  
Collaborative Computing ◽  
Computing Systems

A Novel Energy Saving Approach through Mobile Collaborative Computing Systems

2012 ◽  
pp. 661-676
Author(s):  
Xiaoxin Wu ◽  
Huan Chen ◽  
Yaoda Liu ◽  
Wenwu Zhu
Keyword(s):  
Energy Saving ◽  
Energy Savings ◽  
Transmission Rate ◽  
Handheld Devices ◽  
Collaborative Computing ◽  
Computing Systems ◽  
Collaborative System ◽  
Video Frames ◽  
Long Time ◽  
Save Energy

Energy saving has been studied widely in both of computing and communication research communities. For handheld devices, energy is becoming a more and more critical issue because lots of applications running on handhelds today are computation or communication intensive and take a long time to finish. Unlike previous work that proposes computing or communication energy solutions alone, this paper proposes a novel energy savings approach through mobile collaborative systems, which jointly consider computing and communication energy cost. In this work, the authors use streaming video as investigated application scenario and propose multi-hop pipelined wireless collaborative system to decode video frames with a requirement for maximum inter-frame time. To finish a computing task with such a requirement, this paper proposes a control policy that can dynamically adapt processor frequency and communication transmission rate at the collaborative devices. The authors build a mathematical energy model for collaborative computing systems. Results show that the collaborative system helps save energy, and the transmission rate between collaborators is a key parameter for maximizing energy savings. The energy saving algorithm in computing devices is implemented and the experimental results show the same trend.

A Novel Energy Saving Approach through Mobile Collaborative Computing Systems

2012 ◽  
pp. 90-104
Author(s):  
Xiaoxin Wu ◽  
Huan Chen ◽  
Yaoda Liu ◽  
Wenwu Zhu
Keyword(s):  
Energy Saving ◽  
Energy Savings ◽  
Transmission Rate ◽  
Handheld Devices ◽  
Collaborative Computing ◽  
Computing Systems ◽  
Collaborative System ◽  
Video Frames ◽  
Long Time ◽  
Save Energy

Energy saving has been studied widely in both of computing and communication research communities. For handheld devices, energy is becoming a more and more critical issue because lots of applications running on handhelds today are computation or communication intensive and take a long time to finish. Unlike previous work that proposes computing or communication energy solutions alone, this paper proposes a novel energy savings approach through mobile collaborative systems, which jointly consider computing and communication energy cost. In this work, the authors use streaming video as investigated application scenario and propose multi-hop pipelined wireless collaborative system to decode video frames with a requirement for maximum inter-frame time. To finish a computing task with such a requirement, this paper proposes a control policy that can dynamically adapt processor frequency and communication transmission rate at the collaborative devices. The authors build a mathematical energy model for collaborative computing systems. Results show that the collaborative system helps save energy, and the transmission rate between collaborators is a key parameter for maximizing energy savings. The energy saving algorithm in computing devices is implemented and the experimental results show the same trend.

A Novel Energy Saving Approach through Mobile Collaborative Computing Systems

2010 ◽  
Vol 1 (2) ◽  
pp. 1-16
Author(s):  
Xiaoxin Wu ◽  
Huan Chen ◽  
Yaoda Liu ◽  
Wenwu Zhu
Keyword(s):  
Energy Saving ◽  
Energy Savings ◽  
Transmission Rate ◽  
Control Policy ◽  
Critical Issue ◽  
Handheld Devices ◽  
Collaborative Computing ◽  
Computing Systems ◽  
Collaborative System ◽  
Save Energy

Energy saving has been studied widely in both of computing and communication research communities. For handheld devices, energy is becoming a more and more critical issue because lots of applications running on handhelds today are computation or communication intensive and take a long time to finish. Unlike previous work that proposes computing or communication energy solutions alone, this paper proposes a novel energy savings approach through mobile collaborative systems, which jointly consider computing and communication energy cost. In this work, the authors use streaming video as investigated application scenario and propose multi-hop pipelined wireless collaborative system to decode video frames with a requirement for maximum inter-frame time. To finish a computing task with such a requirement, this paper proposes a control policy that can dynamically adapt processor frequency and communication transmission rate at the collaborative devices. The authors build a mathematical energy model for collaborative computing systems. Results show that the collaborative system helps save energy, and the transmission rate between collaborators is a key parameter for maximizing energy savings. The energy saving algorithm in computing devices is implemented and the experimental results show the same trend.

Artefact in 20Å-Resolution Electron Images of Negatively Stained Twodimensional Membrane Protein Crystals

1982 ◽  
Vol 40 ◽  
pp. 92-93
Author(s):  
Douglas L. Dorset ◽  
Barbara Moss
Keyword(s):  
Electron Scattering ◽  
Cross Correlation ◽  
Transmission Function ◽  
Group Symmetry ◽  
Asymmetric Structure ◽  
Object Model ◽  
Phase Object ◽  
Computing Systems ◽  
Resolution Electron ◽  
Plane Group

A number of computing systems devoted to the averaging of electron images of two-dimensional macromolecular crystalline arrays have facilitated the visualization of negatively-stained biological structures. Either by simulation of optical filtering techniques or, in more refined treatments, by cross-correlation averaging, an idealized representation of the repeating asymmetric structure unit is constructed, eliminating image distortions due to radiation damage, stain irregularities and, in the latter approach, imperfections and distortions in the unit cell repeat. In these analyses it is generally assumed that the electron scattering from the thin negativelystained object is well-approximated by a phase object model. Even when absorption effects are considered (i.e. “amplitude contrast“), the expansion of the transmission function, q(x,y)=exp (iσɸ (x,y)), does not exceed the first (kinematical) term. Furthermore, in reconstruction of electron images, kinematical phases are applied to diffraction amplitudes and obey the constraints of the plane group symmetry.

Recovery boiler sootblowers: History and technological advances

TAPPI Journal ◽  
2015 ◽  
Vol 14 (1) ◽  
pp. 51-60
Author(s):  
HONGHI TRAN ◽  
DANNY TANDRA
Keyword(s):  
Cfd Modeling ◽  
Computing Systems ◽  
The Past ◽  
Technological Advances ◽  
Recovery Boilers ◽  
Computational Fluid Dynamics Cfd ◽  
Recovery Boiler ◽  
Steam Parameters ◽  
Insight Into ◽  
Deposit Removal

Sootblowing technology used in recovery boilers originated from that used in coal-fired boilers. It started with manual cleaning with hand lancing and hand blowing, and evolved slowly into online sootblowing using retractable sootblowers. Since 1991, intensive research and development has focused on sootblowing jet fundamentals and deposit removal in recovery boilers. The results have provided much insight into sootblower jet hydrodynamics, how a sootblower jet interacts with tubes and deposits, and factors influencing its deposit removal efficiency, and have led to two important innovations: fully-expanded sootblower nozzles that are used in virtually all recovery boilers today, and the low pressure sootblowing technology that has been implemented in several new recovery boilers. The availability of powerful computing systems, superfast microprocessors and data acquisition systems, and versatile computational fluid dynamics (CFD) modeling capability in the past two decades has also contributed greatly to the advancement of sootblowing technology. High quality infrared inspection cameras have enabled mills to inspect the deposit buildup conditions in the boiler during operation, and helped identify problems with sootblower lance swinging and superheater platens and boiler bank tube vibrations. As the recovery boiler firing capacity and steam parameters have increased markedly in recent years, sootblowers have become larger and longer, and this can present a challenge in terms of both sootblower design and operation.

Deconstructing Turkey’s “Open Door” Policy towards Refugees from Syria

2015 ◽  
Vol 12 (3) ◽  
pp. 209-225 ◽  
Author(s):  
Burcu Togral Koca
Keyword(s):  
Human Rights ◽  
Civil War ◽  
Border Studies ◽  
Open Door ◽  
Open Door Policy ◽  
Security Framework ◽  
Liberal Policy ◽  
The Way

Turkey has followed an “open door” policy towards refugees from Syria since the March 2011 outbreak of the devastating civil war in Syria. This “liberal” policy has been accompanied by a “humanitarian discourse” regarding the admission and accommodation of the refugees. In such a context, it is widely claimed that Turkey has not adopted a securitization strategy in its dealings with the refugees. However, this article argues that the stated “open door” approach and its limitations have gone largely unexamined. The assertion is, here, refugees fleeing Syria have been integrated into a security framework embedding exclusionary, militarized and technologized border practices. Drawing on the critical border studies, the article deconstructs these practices and the way they are violating the principle of non-refoulement in particular and human rights of refugees in general. 

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