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This paper presents the design, implementation, and evaluation of a sports tactics analysis supporting system. In the field of sports, tactics analysis is conducted using data from multiplayer games. In so doing, it is important to recognize the actual play in a sports game. This research focuses on reproducing player action in sports games. Unlike the conventional systems that only display static...
Time-based localization techniques such as multilateration are favoured for positioning to wide-band signals. Applying the same techniques with narrow-band signals such as GSM is not so trivial. The process is challenged by the needs of synchronization accuracy and timestamp resolution both in the nanoseconds range. We propose approaches to deal with both challenges. On the one hand, we introduce...
Protocols for neighbor cardinality estimation can be used by a node in an ad hoc or sensor network to obtain a fast approximation of the number of nodes in its radio range. While the performance of such estimators was studied via simulations and mathematical analysis, we show here for the first time a proof-of-concept and performance test with an implementation on low-power wireless sensor devices...
Traditionally, the architecture of control system in large physics experiment is based on PLC and DCS like EPICS. For the control information in controls system, its timestamp is marked in control computer after transferred from PLC to computer. This mode will introduce more time deviation in time stamp. In CSNS, we will use a new PLC from BECKHOFF which can provide real-time timestamp, and we can...
Counting and identifying neighboring active nodes are two fundamental operations in wireless sensor networks (WSNs). In this paper, we propose two mechanisms, Power based Counting (Poc) and Power based Identification (Poid), which achieve fast and accurate counting and identification by allowing neighbors to respond simultaneously to a poller. A key observation that motivates our design is that the...
In this paper we will describe a positioning system based on synchronized IR light. Each node will be assigned a timeslot where they will send out an IR light. There is an IR camera that is also synchronized to the timeslots that will detect the position of each node and the ID that corresponds to the timeslot. To synchronize the clock of all nodes an IR flashlight is sent out that is detected by...
Time synchronization is of great significance in underwater acoustic (UWA) networks. Many functions, such as network protocol stack, sleep-scheduling, and localization, are based on time synchronization. Because underwater sound speed is comparatively slow, synchronization protocols encounter a long propagation latency problem, which differs from those in terrestrial sensor networks. As a result,...
In this work we propose a fail-safe control strategy to achieve a target network reliability by estimating the lifetime of nodes in a Wireless Sensor Network (WSN). In the proposed scheme, a network coordinator estimates the outage probability of small-scale uncorrelated fading channel uses and regulates the transmit power of each node in the network in order to simultaneously guarantee the outage...
As modern systems are integrating exceeding number of components for better performance and functionality, early full-system simulation tools have become essential for validating complex concurrent system interaction activities. In the past decades, many useful timing-accurate system simulation tools have been developed; however, we find that even for the most efficient techniques, more than 90% of...
The advance in nanotechnology has enabled the fabrication of nanomachines for health applications. Recently, molecular communication has become a promising communication paradigm that allows nanomachines to exchange information by using messenger molecules in fluid environments. To enable molecular communications, the knowledge of distance between nanomachines is critical since the distance affects...
Recently, various consensus-based protocols have been developed for time synchronization in wireless sensor networks. However, due to the uncertainties lying in both the hardware fabrication and network communication process, it is not clear how most of the protocols will perform in real implementations. In order to reduce such gap, this paper investigates whether and how the typical consensus-based...
Brain-Computer Interaction (BCI) is a technology developed with the purpose of building a pathway between the brain and computer which is independent of neuromuscular functions. Potential applications in rehabilitation of patients with motor disabilities and video gaming make BCI an important field of research. A task like controlling a prosthetic limb using BCI is challenging. Performing this with...
The symmetry of packet delay is one of basic assumption of PTP (Precision Time Protocol). But most existing networks could not meet this assumption to achieve high accuracy PTP synchronization. The FIFO block is one of main reasons that lead packet delay asymmetry according to the research. So the packet delay estimation with minimum FIFO block is put forward to try to select those “lucky packets”...
This paper describes a substation avalanche test system which is based on B code. The system supports simultaneous operation of multiple remote signaling and can ensure the synchronization and accuracy of time's movement. Using platform of ARM9 hardware and embedded operating systems, the system has lots of feature, such as high integration, small size and stable. The host computer can operate the...
The time synchronization system which uses the BeiDou and GPS as double clock source can receive GPS and the BeiDou satellite signal. The system built-in constant temperature crystal clock or rubidium clock utilizes the "BeiDou bidirectional synchronization method" technology and advanced control algorithm. The core control processor using STM32 chip with high performance, which can achieve...
Time synchronization is a fundamental problem in any distributed system. In particular, wireless sensor networks require scalable time synchronization for implementing distributed tasks on multiple sensor nodes. This paper proposes an energy efficient Coefficient Exchange Synchronization Protocol (CESP) based on a receiver-receiver synchronization scheme that minimizes the impact of access-time delays...
Analyze the time synchronization problem of the GPS/INS Integrated Navigation System. The relationship between time delay and data fusion filter performance is analyzed in the GPS/INS Integrated Navigation System on the basis of Kalman Filter algorithm. Design the time synchronization system on the basis of the 100Hz data collection signal to generate the pseudorange collection signal. The system...
Considering low estimation accuracy and small synchronization range of carrier synchronization algorithms in low signal-to-noise ratio (SNR) for short burst communication systems, a joint pilot and iterative decoding soft-output carrier synchronization algorithm is proposed, which utilizes the time-domain correlation algorithm for coarse estimation and makes hard decision directly for systematic soft-information...
In this paper we propose a solution to generate tree-structure outline for lecture videos by analyzing their synchronized slides, by which detailed lecture overview can be automatically provided to E-learning portal users. Starting with OCR (Optical Character Recognition) result, we reconstruct the content of each slide. After that, we explore logical relations between slides, in order to make them...
Nowadays, the growing presence of distributed energy resources (DER) makes the management of the distribution grid more complex, thus requiring distributed monitoring and controlling capabilities. The deployment of locally distributed intelligent devices over a large area involves a high performance network infrastructure (typically based on heterogeneous communication technologies) in order to provide...
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