PPT-Gradient Clock Synchronization

in Wireless Sensor Networks Philipp Sommer Roger Wattenhofer Time Synchronization is a wellstudied Problem Time Clocks and the Ordering of Events in a Distributed System L Lamport Communications of the ACM 1978. eeethzch Abstract Clock synchronization is one of the most basic building blocks for many applications in computer science and engineering The purpose of clock synchronization is to provide the constituent parts of a distributed system with a common g shooter detection Goals of clock synchronization Compensate offset between clocks Compensate drift between clocks terms are explained on following slides Time Synchronization Sensing Localization Duty Cycling TDMA Ad Hoc and Sensor Networks Roger W ReferenceBroadcast Synchronization RBS is a technique that allows a set of receivers in a broadcast network to accurately esti mate each others clock values RBS provides a relative timeframe for conversion between the local clocks of di erent nodes Rui. . Gu. , . Guoliang. . Jin. , . Linhai. Song, . Linjie. Zhu, Shan Lu. University . of Wisconsin – Madison, USA. Proper Thread Synchronization . is . Hard. Very easy to get things wrong. H. ard-to-find concurrency bugs(Data race, Atomicity Violation, Dead Lock). Hakim Weatherspoon. CS 3410, Spring 2012. Computer Science. Cornell University. P&H Chapter 2.11. Administrivia. Pizza . party: PA3 Games Night. Friday, April 27. th. , 5:00-7:00pm. Location: Upson . Susmitha. . kota. . 21-sep-2015. AGENDA. Introduction. Synchronization. Physical Clocks. Global Positioning System. Algorithms. Future Work. References. Introduction: Real . Time System. Clock. . Synchronization. in Wireless Sensor Networks. Philipp Sommer. Roger Wattenhofer. Time Synchronization is a well-studied Problem. Time, Clocks, and the Ordering of Events in a Distributed System. Tan. 2*. . David Yau. 1,3. 1. Advanced Digital Sciences Center (ADSC), Illinois at Singapore. 2. Nanyang Technological University, Singapore. 3. Singapore University of Technology and Design; . Marc S. . Orr. †. §. , . Shuai . Che. §. , Ayse Yilmazer. §. ,. Bradford . M. . Beckmann. §. , Mark . D. . Hill. †. §. , . David A. . Wood. †. §. †. UW-Madison, . §. AMD . Research. ASPLOS, March 16, 2015. Farnaz. . Moradi. . Asrin. . Javaheri. Outline. Wireless sensor networks. Surveillance Applications. Clock synchronization. Synchronization algorithms. RBS. FTSP. Implementation. Performance Evaluation. John Levine, P.E.. Levine Lectronics and . L. ectric. Why do we need to synchronize our relays?. Relays at all three locations tripped. All three had different times. Are these events related???. Definitions. Professor Hugh C. Lauer. CS-3013, Operating Systems. (Slides include . copyright materials . Modern . Operating Systems. , 3. rd. ed., by Andrew Tanenbaum and from . Operating System Concepts. , 7. th. Second ISSI Workshop on Spacetime Metrology, Clocks and Relativistic Geodesy. March 25-28, 2019. International Space Science Institute, Bern, Switzerland. Nathan R. Newbury. NIST, Boulder, CO, USA. Team. Time and Clock Time and Clock Primary standard of time = rotation of earth De facto primary standard = atomic clock (1 atomic second = 9,192,631,770 orbital transitions of Cesium 133 atom.