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The thermal contact resistance between two surfaces is a pervasive hurdle to effective heat transport in avionics, telecommunications, data center, and other electronics thermal management applications. A novel concept for dry contact thermal conductance enhancement is presented that utilizes a custom-made projection micro-sterolithography (μSL) system to fabricate ‘spring-like’ 3D microstructures...
Data aggregation is an important mechanism to reduce energy consumption in Wireless Sensor Networks (WSNs). By investigating spatial and/or temporal correlation of raw data, sensor nodes can aggregate raw data to a meaningful digest instead of directly sending raw data to sink, this process is considered as data aggregation. Several aggregation works focus on the raw data, they use raw data to cluster...
Data aggregation has been developed to take benefits from either spatial or temporal correlation of collected data. In wireless sensor networks, data aggregation is a key mechanism to reduce energy consumption and to increase capacity. Most current aggregation functions are designed for specific network topology or data pattern, with prior assumptions. Concretely, these functions are developed with...
This paper presents a model checking-based schedulability checking approach for Rate-Monotonic Scheduling (RMS) algorithm. To do so, RMS algorithm is modelled with TMSVL, and the desired property, i.e. Schedulability, is specified with the property specification language in TMSVL. Next, whether RMS algorithm is schedulable on a set of tasks is verified by checking whether the desired property is valid...
Data aggregation is a key problem in wireless sensor networks due to both energy-constrained and bandwidth-constrained. In this paper, we highlight the aggregation benefits in network layer and MAC layer by modeling the energy consumption for some energy-efficient routing protocols and MAC protocols. Besides, we define two parameters, aggregation ratio w and packet size coefficient λ, to evaluate...
Reconfigurable architectures have found use in a wide range of application domains, but mostly as static accelerators for computationally intensive functions. Commodity computing adoption has not taken off due primarily to design complexity challenges. Yet reconfigurable architectures offer significant advantages in terms of sharing hardware between distinct isolated tasks, under tight time constraints...
The practical applications of wireless sensor networks require robust time synchronization. In this paper we describe the Flooding Time Synchronization Protocol (FTSP) that provides time synchronization service in such networks. We found there are Key nodes and Non-key nodes when using FTSP in the case of temperature interference. This protocol was designed to utilize low communication bandwidth,...
Ruin probability is an important scale of measurement for insurance company, for it can know own compensation ability well, so it is important to research ruin probability's advancing expansion for its stable manage. In this paper, we consider the classical risk model, assuming that the tail of claim-size is second-order regular variation. First we prove the closeness of second-order regular variation,...
Emergency evacuation has many applications in computer animation, virtual reality, architecture planning, safety science, etc. However, current methods most focus on the agent-based modeling and simulation. These simulation results can not consider the human behavior fully and their reliabilities are doubtable. This paper presents a new method to simulate the large-scale crowds in real-time and verify...
With the intensive development of university information system, the increasingly expanding and accumulating historical data seriously affects the efficiency of information system performance and brings data management and storage difficulty. In view of university's data characteristics, connected with the authors' experience of data archiving in data management, in this paper the authors put forward...
Precision Agriculture Monitor System (PAMS) is an intelligent system which can monitor the agricultural environments of crops and provides service to farmers. PAMS based on the wireless sensor network (WSN) technique attracts increasing attention in recent years. The purpose of such systems is to improve the outputs of crops by means of managing and monitoring the growth period. This paper presents...
Progresses in the study of speciation and biological uptake of arsenic in soil are introduced. The researches on bioavailability of arsenic are summarized, and the main factors which affect arsenic bioavailability are emphatically discussed. Relationship between speciation and availability of arsenic is concluded and the concerned problems and future development orientation are pointed out.
Thermal aware scheduling (TAS) is an important system level optimization for CMP and MPSoC. An event driven thermal estimation method which can assist dynamic TAS is proposed in this paper. The event driven thermal estimation is based upon a thermal map which is updated only when a high level event occurs. To minimize the overhead, while maintaining the estimation accuracy, the prebuilt look-up-tables...
Reconfigurable devices such as Field Programmable Gate Arrays (FPGAs) are very popular in today?s embedded systems design due to their low-cost, high-performance and flexibility. Partially Runtime-Reconfigurable (PRTR) FPGAs allow hardware tasks to be placed and removed dynamically at runtime. Hardware task scheduling on PRTR FPGAs brings many challenging issues to traditional real-time scheduling...
Partially runtime-reconfigurable (PRTR) FPGAs allow hardware tasks to be placed and removed dynamically at runtime. We present an efficient algorithm for finding the complete set of maximal empty rectangles on a 2D PRTR FPGA, which is useful for online placement and scheduling of HW tasks. The algorithm is incremental and only updates the local region affected by each task addition or removal event...
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