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Process synchronization without long-term interlock

William B. Easton
1971 Proceedings of the third symposium on Operating systems principles - SOSP '71  
A technique is presented for replacing long-term interlocking of shared data by the possible repetition of unprivileged code in case a version number (associated with the shared data) has been changed  ...  by another process.  ...  Furthermore, it requires all interlocks within the system to be short-term interlocks (which can be implemented by looping on a test-and-set instruction) rather than ions-term interlocks (which require  ... 
doi:10.1145/800212.806505 dblp:conf/sosp/Easton71 fatcat:h5e5sjk4uzbfpezj6mlswlqwoe

Low–Level Space Optimization of an AES Implementation for a Bit–Serial Fully Pipelined Architecture [chapter]

Raphael Weber, Achim Rettberg
2009 IFIP Advances in Information and Communication Technology  
The special architecture for which this implementation is targeted comprises synchronous and systematic bit-serial processing without a central controlling instance.  ...  In order to shrink the design in terms of logic utilization we deeply analyzed the architecture and the AES implementation to identify the most costly logic elements.  ...  Two operators run concurrently, if the packets they process have been synchronized at some point in the data flow graph and stay synchronized.  ... 
doi:10.1007/978-3-642-04284-3_25 fatcat:3rprr4ktj5eyni4pxipbe3zhzu

A tree arbiter cell for high speed resource sharing in asynchronous environments

Syed Rameez Naqvi, Andreas Steininger
2014 Design, Automation & Test in Europe Conference & Exhibition (DATE), 2014  
We present a novel tree arbiter cell that allows a pipelined processing of asynchronous requests.  ...  A small difference that we have brought into this mechanism is the release of the MUTEX (r1−, r2−) without waiting for the client's request going down: since the mutual interlocking already prevents the  ...  One solution here is to synchronize all clients' requests to one time domain, thus reducing the problem to the globally synchronous case.  ... 
doi:10.7873/date.2014.308 dblp:conf/date/NaqviS14 fatcat:hfsanpq4gfct7kbz2amrg5kipe

design and manufacturing [chapter]

Martin H. Weik
2000 Computer Science and Communications Dictionary  
For example, the same control function is usually implemented several times in different stages in the development process, without much reuse of information from earlier stages in the process.  ...  To improve this situation, the sub-processes that generate information have to work together in a better way. This requires efficient information handling and use of standardized software components.  ...  The interlocks, defined by a mechanical designer, define which operations are allowed to be executed without causing damages to the cell.  ... 
doi:10.1007/1-4020-0613-6_4772 fatcat:o4x3csydsnanthujtmnjwyjh7i

Operational experience of ALBA's Digital LLRF at SOLARIS Light Source [article]

P. Borowiec, P. Klimczyk , A. Salom, A. Mitrovic ALBA-CELLS Synchrotron, Cerdanyola del Valles, Spain, MAX IV Laboratory, Lund, Sweden)
2018 arXiv   pre-print
Thanks to high flexibility of dLLRF only small adaptations were needed in terms of interfaces to auxiliary systems and setup of parameters.  ...  It was done at the first stage by observation of forward power from RF transmitters, after calibration of the system by calculation of the synchronous phase, which is 167.4°±2.7 [2] Long term test shows  ...  RF signals needed for the main feedback loop; and 2nd with fast ADCs (MI125 with 16 ADCs -14 bits -125 MHz) called Diagnostic Board which processes RF signals for interlock purposes.  ... 
arXiv:1803.08969v1 fatcat:vrldnc7wpnavziblfkn6kq3usu

Simplicity in the Design, Operation, and Applications of Mechanically Interlocked Molecular Machines

Andrew W. Heard, Stephen M. Goldup
2020 ACS Central Science  
a design principle that could be applied in the development of the next generation of molecular machines with a view to moving toward real-world applications of these intriguing systems in the longer term  ...  Mechanically interlocked molecules are perhaps best known as components of molecular machines, a view further reinforced by the Nobel Prize in 2016 to Stoddart and Sauvage.  ...  However, it is worth highlighting that the principles embodied in such prototypes suggest long-term, high-value applications of interlocked molecule machines.  ... 
doi:10.1021/acscentsci.9b01185 pmid:32123730 pmcid:PMC7047278 fatcat:vxgkrb3zdjhafd6e5xkgdnrs3a

Hierarchical protection control system of smart substations

Yuping ZHENG, Delin WANG, Zexin ZHOU, Tuanjie CAO
2014 Journal of Modern Power Systems and Clean Energy  
circuits of traditional substations, and introduces the hierarchical protection and control system of smart substations based on the technologies like IEC 61850 Standard, electronic instrument transformer, process  ...  Wide area protection and control functions shall be realized without depending on external time synchronization system to the greatest extent.  ...  The substation area protection and control functions shall be realized without depending on external time synchronization system to the greatest extent [10, 11] .  ... 
doi:10.1007/s40565-014-0070-2 fatcat:dtgytwpxgvhwzim2nagy2zfuti

Design of a Mutual Exclusion and Deadlock Algorithm in PCBSD – FreeBSD

Libertad Caicedo Acosta, Camilo Andrés Ospina Acosta, Nancy Yaneth Gelvez García, Oswaldo Alberto Romero Villalobos
2014 International Journal of Interactive Multimedia and Artificial Intelligence  
This paper shows the implementation of mutual exclusion in PCBSD-FreeBSD operating systems on SMPng environments, providing solutions to problems like investment priority, priority propagation, interlock  ...  strategy as the primary method to manage short-term threads synchronization [3] .  ...  As previously mentioned, FreeBSD-PCBSD implements the Mutex Synchronization strategy as the primary method to manage short-term threads synchronization which in junction with the proposed algorithm improves  ... 
doi:10.9781/ijimai.2014.316 fatcat:ljrf7de2bba45kngdqljyd5hk4

On the relevance of adversarial queueing theory in practice

Daniel S. Berger, Martin Karsten, Jens Schmitt
2014 The 2014 ACM international conference on Measurement and modeling of computer systems - SIGMETRICS '14  
Our analysis proves the robustness of these new adversaries against randomized de-synchronization effects in terms of variable link delays and nodal processing. 1 7 ≈ 14.23% for r = 1.0.  ...  In addition, we study the effect of imperfect network synchronization under the packet loss metric.  ...  For the scenarios analyzed in Sections 5 and 6, the long-term behavior of the system converges asymptotically to this worst case.  ... 
doi:10.1145/2591971.2592006 dblp:conf/sigmetrics/BergerKS14 fatcat:dymlgt6ko5cz5geyg7fvsikwwa

On the relevance of adversarial queueing theory in practice

Daniel S. Berger, Martin Karsten, Jens Schmitt
2014 Performance Evaluation Review  
Our analysis proves the robustness of these new adversaries against randomized de-synchronization effects in terms of variable link delays and nodal processing. 1 7 ≈ 14.23% for r = 1.0.  ...  In addition, we study the effect of imperfect network synchronization under the packet loss metric.  ...  For the scenarios analyzed in Sections 5 and 6, the long-term behavior of the system converges asymptotically to this worst case.  ... 
doi:10.1145/2637364.2592006 fatcat:moaf4fdk25cqfpsdu46fmrffbe

Effectiveness of frequency relays on networks with multiple distributed generation

A.A.M. Hassan, Tarek A. Kandeel
2015 Journal of Electrical Systems and Information Technology  
The factors that will be investigated are frequency measuring techniques, measuring windows, time delays and under voltage interlock function.  ...  FR1 with under voltage interlock function and FR2 without under voltage interlock function. Case 4 (:). FR1 without under voltage interlock function and FR2 with under voltage interlock function.  ...  Both FR1 and FR2 without under voltage interlock function. Case 2 (:). Both FR1 and FR2 with under voltage interlock function. Case 3 (:).  ... 
doi:10.1016/j.jesit.2015.03.007 fatcat:z373x6rx3fc3bmectsdlsla7ty

Tailored solutions for safety-installations in the Loetschberg tunnel

Walter Fuß
2008 Proceedings of the conference on Design, automation and test in Europe - DATE '08  
This article focuses on the challenges for the interlocking system LockTrac 6131 ELEKTRA.  ...  To fulfill all the safety requirements and the challenges of reliability and maintainability of this very long tunnel a lot new functions were to be realized in each of the mentioned systems.  ...  Overview The architecture of the whole system of safety installations (see figure 2) contains two interlocking stations for the tunnel (FRO and FRW) without optical signalling, one for each tube, and the  ... 
doi:10.1145/1403375.1403384 fatcat:iiabo6vss5fvhpaa4ndftn6vem

Conservation of Energy in Wireless Sensor Network by Preventing Denial of Sleep Attack

Swapna Naik, Narendra Shekokar
2015 Procedia Computer Science  
Also to enhance security further the interlock protocol is used during key exchange.  ...  Our scheme uses zero knowledge protocol (ZKP) for verifying the authenticity of the sensor nodes which pass the sleep synchronization messages.  ...  Throughput with and without attack  ... 
doi:10.1016/j.procs.2015.03.164 fatcat:r6wdd3gr3rfchbczjmwq5m3twe

LHC Collimators Low Level Control System

Alessandro Masi, Roberto Losito
2008 IEEE Transactions on Nuclear Science  
The low level control system (LLCS) of the LHC collimators is responsible for accurate synchronization of 500 axes of motion at microsecond level.  ...  Redaelli for the long discussions on the architecture of the collimation control system. They are indebted to their colleagues of the AB/ATB/LPE Section, in particular A. Brielmann, G. Conte, M.  ...  Without their help and support that went beyond standard commercial relationships, the implementation of this project would never have been possible. Finally, the authors wish to thank C.  ... 
doi:10.1109/tns.2007.914206 fatcat:xohwbeii75brjobwlh3du6txa4

LHC Collimators Low Level Control System

Alessandro Masi, Roberto Losito
2007 2007 15th IEEE-NPSS Real-Time Conference  
The low level control system (LLCS) of the LHC collimators is responsible for accurate synchronization of 500 axes of motion at microsecond level.  ...  Redaelli for the long discussions on the architecture of the collimation control system. They are indebted to their colleagues of the AB/ATB/LPE Section, in particular A. Brielmann, G. Conte, M.  ...  Without their help and support that went beyond standard commercial relationships, the implementation of this project would never have been possible. Finally, the authors wish to thank C.  ... 
doi:10.1109/rtc.2007.4382732 fatcat:y37yg2mddnao3kyjlunnzjv4ja
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