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Requirements of different applications and usage scenarios on a wireless positioning system is very different. A single positioning system is unlikely to meet all the requirements. UWB based positioning systems offer a solution which would meet all the indoor usage requirements. Though, the theoretical positioning accuracy offered by such systems is very good, in actual implementation, their accuracy...
Wireless sensor networks deployed in industrial monitoring applications are required to gather information about multiple types of data (multi-dimensional) related to the environment. The primary challenge that any WSN presents is energy and latency optimization. Hence, for query resolution about a particular data push and pull methods must be efficiently employed. The A-MDMRA model stores data in...
Contrary information is recorded in the process of Ribonucleic Acid transcription, which is similar to the anti-synchronization process. In this paper, the anti-synchronization of coupled Boolean networks is investigated. Firstly, the definition of anti-synchronization is introduced, and the drive-response Boolean networks dynamics are translated into linear representations with the semi-tensor product...
High-speed, image-sensor visible light communication using rolling shutter has been studied. Symbol synchronization method by sequential estimation is applied to the line scan sampling using the rolling shutter of the image sensor and achievable symbol rate is simulated. Over 1400 symbols per second can be realized by the symbol synchronization at the frame rate of 30 fps with a QVGA screen. Acceptable...
Due to the rapidly increasing use of big data, machines are stressed to provide more computing power at higher energy efficiency while maintaining simpler and more scalable computing paradigms. Transactional Memory (TM) is one such technique that can be used for synchronization instead of conventional locks used in critical sections since it has simpler paradigms, is scalable and has better energy...
Based on a workshop developed at INICTEL-UNI, this paper presents the methodology and considerations taken to improve the experiences in communication laboratory sessions in Peruvian universities with Software Defined Radio platforms, using a HackRF-One for transmission and a RTL-SDR for reception together with GNUradio Companion, an open source software. The use of these tools allows real communications...
We investigate the problem of content adjustment in real time according to the usage of storage and spectrum resources in elastic optical datacenter networks. A novel resource-efficient content adjustment (RECA) scheme is proposed to minimize spectrum consumption, content synchronization cost, and blocking probability.
This paper proposes an adaptive method to modify network delay caused by clock skew. First, we introduce the concept of end-to-end network delay, and then we propose a method which aims at eliminate the effect cause by the difference clock frequency. The method first denoises the data set to remove error points, and then uses Least Square Method to estimate the clock skew in distributed network. Finally,...
We consider the case of spreadsheet based workgroup collaboration, in which users cooperate through spreadsheets. While spreadsheet exchange through email and shared directories is still the most common way to share data, spreadsheet sharing in the Cloud is rapidly spreading, leveraging the evolution of office tools toward delocalized system over the Cloud. In this paper we observe that spreadsheet...
A real-time learning analytics system is proposed for in-classroom use. We used an e-learning system and an e-book system to collect real-time learning activities during lectures. The collected logs were analyzed and presented visually on a web-based system for the teacher. The teacher can monitor how many students are viewing the same page as the teacher, whether they are following the explanation,...
A worksharing model is presented to enhance parallel compression of data-intensive bitmap indices. To increase spatial locality, our approach interleaves multiple independent bitmaps in a combined file. Each file block, which fits entirely in cache, is processed by independent threads. Results show that our model significantly outperforms embarrassingly-parallel designs.
Recent years have witnessed a growing popularity of file synchronization systems. In this paper, we take a first step towards the understandings of a new Peer-to-Peer file synchronization system, Resilio Sync. Our real-world measurement identifies its unique features and reveals its potential fairness issues
In this paper we present a new approach to implementing causal consistency in geo-replicated data stores, which we call Optimistic Causal Consistency (OCC). The optimism in our approach lies in that updates from a remote data center are immediately made visible in the local data center, without checking if their causal dependencies have been received. Servers perform the dependency check needed to...
In Named Data Networking (NDN), data synchronization plays an important role similar to transport protocols in IP. Many distributed applications, including pub-sub applications such as news and weather services, require a synchronization protocol where each consumer can subscribe to a different subset of a producer's data streams. However, existing Sync protocols support only full-data synchronization,...
In this paper, we address the fundamental problem of improving the performance of many-to-one and many-to-many communications. Our approach is Time Division Multiple Access (TDMA) based but addresses the limitations of existing TDMA implementations in a novel way. In a nutshell, we combine packets from many senders into a single large packet transmission by exploiting capture effect achieved through...
With significant increases in mobile device traffic slated for the foreseeable future, numerous technologies must be embraced to satisfy such demand. Notably, one of the more intriguing approaches has been blending on-device caching and device-to-device (D2D) communications. While various past research has pointed to potentially significant gains (30%+) via redundancy elimination (RE), some skepticism...
This experience paper presents how a globally distributed software engineering team was able to deliver usable software at the end of each takt, why this was important, and the benefits derived. We also describe the approach taken, the challenges faced and the steps to overcome them.
This paper proposes a polynomial fuzzy control design strategy for synchronizing multi-scroll Chen chaotic systems. At first, the master and slave multi-scroll Chen chaotic systems are transformed into the equivalent polynomial fuzzy models. Then a polynomial fuzzy control is designed to synchronize the master and slave polynomial fuzzy models. In the control design, the polynomial feedback gains...
Programmers use begin constructs in Chapel to create fire and forget-style tasks, which do not perform any implicit synchronization with the parent task. While this provides a good facility to invoke parallel tasks, it poses issues when the child task accesses a variable declared in the scope of its ancestor. If the parent task exits before the child, its scope is deallocated and the child may end...
This study presents an application of Iterative Learning Control Theory (ILC) for synchronization between two chaotic systems with output signal error. The iterative learning law illustrates the relationship between (i-1)-th iterative error output of drive-response system and iterative (i-th) input of response system. The error convergent describes the path response system tracking the trajectory...
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