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More diverse marine tasks and longer range water missions require the hydrodynamic shape, viz. hull shape, of Autonomous Underwater Vehicles (AUVs) for both efficient design and least resistance. Therefore a systematic design for the hydrodynamic shape of AUVs is needed and necessary to meet the various requirements. In the present work, a hierarchical classification for the hull shape of AUVs was...
With the wide application of Automatic Identification System (AIS) on ships, a large amount of data is generated, namely AIS data. It is of great significance for the development of water transportation to process the data effectively. Traditional relational database management systems (RDBMS) have low performance when processing massive data. In this paper, HBase which is a representative of the...
Phase change memory (PCM) is one of the most promising candidates to replace DRAM as main memory in deep submicron regime. Regardless of single-level or multiple-level cells, the programming costs to each state exhibit significant asymmetries in latency, energy and endurance. In this paper, we exploit the potential of reducing programming costs in terms of latency, energy, and endurance for PCM through...
Using phase change memory (PCM) as main memory for embedded systems, such as Beidou navigation terminals, has many advantages, such as non-volatile, energy saving, anti-crack and so on. However, the problem of write operations needs to be solved to prevent premature failure of the PCM chips. In this paper, the data allocation problem of a hybrid PCM and DRAM main memory in Beidou navigation terminals...
Power, performance, and durability are the most concerned features in design of embedded systems, such as navigation terminals. The storage system is often the main cause of power bottlenecks and durability bottlenecks. In this paper, Phase-Change-Memory (PCM), which has many advantages such as non-volatile, energy saving, robust and so on, is used in the Beidou navigation terminals. With the design...
With the development of the Internet, traditional big data computing platform gradually lose its competitive advantages as a result of high latency. On the contrary, a fast, easy to use and generic big data computing frame called Spark draws more and more attentions. At the same time the integrated solution which is based on RDD (Resilient Distributed Datasets) and is offered by Spark makes the applications...
Kitchen safety in catering industry has a direct impact on people's health and life safety. In this paper, a kitchen video monitoring system named “sunshine kitchen” is designed and constructed, which is based on cloud computing and video data analysis and provides services for the public, government, operators and other groups of people. One cloud data center is constructed as the supporting and...
Based on the actual needs of Smart Humen Port, a logistics cloud platform for Dongguan Port of Humen is constructed. Using cloud computing techniques, the platform implements the resource integration of physical servers, storage devices and a variety of heterogeneous applications, and provides enterprises public infrastructure services, basic business systems and supporting systems, and enterprise...
Informatization is the ultimate way out for audit method in China. In order to improve audit quality, the auditee's information system always needs to be restored on the auditors' environment by re-installing them. The kind of audit model brings great pressure to the auditors, not only is the heavy workload at each audit project, but also there is incompatibility problems between different operating...
Cloud computing has good prospects in many application fields, because it dramatically reduces the construction cost, brings data integration capability, and has efficient and flexible working models. One core layer of cloud platform is the IaaS layer. In this paper, an instance of IaaS platform is proposed, called G-Cloud, which is a cloud operating system and supports the virtualization and unified...
Phase change random access memory (PRAM) is one kind of nonvolatile memory, which is desirable to be used for DSP systems as main memory, as it consumes less power than DRAM and is much denser than DRAM. In this paper, we utilize a hybrid main memory composed of DRAM and PRAM, which leverages the low power consumption of PRAM while minimizing the performance and lifetime degradation caused by PRAM...
Image process is a key process to the fish-like robot polo game. A good image process system is one of the basic elements of winning the game. But in the past games, it was before the game begun that we made effort to adjust the parameters to adapt to the environment. Obviously, this kind of method couldn't meet the reality of the changeable competition environment. This paper proposes a self adaptive...
A lab-scale two-stage UASB-A/O combined process for treating the real municipal waste leachate and a pilot-scale SBR for treating the municipal wastewater were used to investigate the inhibition kinetics of FA(free ammonia, FA) and MLSS(Mixed liquor suspended solids,MLSS) to nitrification rate. Under the premise of achieving short-cut nitrification-denitrification stably (running 130 days) in UASB-A/O...
Non-volatile memories are good candidates for DRAM replacement as main memory in embedded systems and they have many desirable characteristics. Nevertheless, the disadvantages of non-volatile memory co-exist with its advantages. First, the lifetime of some of the non-volatile memories is limited by the number of erase operations. Second, read and write operations have asymmetric speed or power consumption...
In this paper, we focus on register allocation techniques to simultaneously reduce energy consumption and heat buildup of register accesses. The conflict between these two objectives is resolved through the introduction of a hardware rotator. A register allocation algorithm followed by a refinement method is proposed based on the access patterns and the effects of the rotator. Experimental results...
In this paper, we utilize a hybrid main memory composed of DRAM and Phase Change Random Access Memory (PRAM) for DSP systems, which leverages the low power consumption of PRAM while minimizing the performance and endurance degradation caused by write operations on PRAM. We re-consider the variable partitioning problem on this hybrid main memory. Different objectives, for example power consumption...
Cache is known for its unpredictability in embedded systems. Cache locking technique is often utilized to guarantee a tighter prediction of Worst-Case Execution Time (WCET) which is one of the most important performance metrics for embedded systems. However, in Multi-Processor Systems-on-Chip (MPSoC) systems with multi-tasks, Level 2 (L2) cache is often shared among different tasks and cores, which...
Multiple memory banks with bank switching is a technique to increase memory size without extending address buses. A special instruction, Bank Selection Instruction (BSL) is inserted into the original programs to modify the bank register to point to the right bank, which increases both the code size and runtime overhead. In this paper, we carefully partition variables into different banks and insert...
Though a lot of research has been done on fault tolerance for MPI applications, process migration has not gained widespread use because the complexity of the requirement that the knowledge about the location of a migrated process has to be made known to every other process in the MPI application. In this paper, we present a novel and effective process migration method for MPI application. We implement...
Modern processors often provide cache locking capability which can be applied statically and dynamically to manage cache in a predictable manner. The selection of instructions to be locked in the instruction cache (I-Cache) has dramatic influence on the performance of multi-task real-time embedded systems. This paper focuses on using cache locking techniques on a shared I-Cache in a real-time embedded...
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