Qingguo Zhou

Barrier synchronization for CELL multi-processor architecture

Cell microprocessor is a new multi-processors system, which has been used for consumer electronics, multimedia decoding/encoding, compress or uncompressing area. One important development technology for multi-processor system is barrier synchronization, which can improve the system performance if the appreciated barrier is adopted. Based three different communication mechanisms (mailbox, dma, and signal notification register) offered by CELL system, we implement three kinds of barrier implementation tools on the CELL multi-processor system. In the paper, we will show the implementation of barrier synchronization tools and compare the barriers from three aspects: spu size, performance, and synchronization information capacity.

Cost-Efficient Data Cryptographic Engine Based on FPGA

FPGA offers major advantages when using them forcryptographic applications. It is effective way to useFPGA as a cryptographic engine co-operating withgeneral-purpose CPU system to implement cost-efficientsecurity systems. In this paper, we implement a encryptsystem using Xilinx virtex-4 FPGA device. The core of thesystem is two widely used cryptographic algorithm core:SHA256 and AES128. These two cores are mounted onthe WISHBONE bus and interacting with computerthrough PCIe port.. At the same time, the well-definedAPIs for applications are provided. The system design iswith hardwares effectiveness in mind. The FPGA encryptsystem is almost 20 times faster than the double coreprocesser, also its only take 5% CPU usage thansoftware 90% CPU usage. This cryptographic engine wasused as an integral part of security data storage system.

BD-LZW picture compression algorithm for WSN system

In the paper, a new parallel LZW-Like algorithm, bi-directory LZW algorithm (BD-LZW) will be interpreted. The new algorithm can be used in data compression/decompression system which runs on multi-microprocessor system, such as CELL, which the algorithm will be implemented on. Different from the conventional parallel LZW algorithm with one input directory, BD-LZW algorithm allows two threads reading characters from two ends of string. By this method, the data can be partitioned for compression/decompression loading between two threads fairly and easily. The most important is the compression performance can be improved by the new algorithm. Comparing running time, its lower 10% than conventional parallel LZW (P-LZW) algorithm when there are two threads running on CELL architecture.

Port embedded Linux to XUP Virtex-II Pro development board

As its free, rich code resource and supporting many kinds of CPU architecture, Linux is making steady progress in the embedded arena. The Virtex-II Pro serials development system, produced by Xilinx company, provides an advanced hardware platform that consists of a high performance Virtex serials platform FPGA surrounded by a comprehensive collection of peripheral components that can be used to create a complex system and meet different special embedded application areas. This paper mainly introduces porting embedded Linux to the XUP Virtex- II Pro development system, and using serials of development tool kits. It is a good guide to develop embedded system with FPGA development system and Linux.

A case study of microkernel for education

The paper will introduce a new operating system architecture microkernel for education. For its safe, small, and flexible feature, micorkernel is becoming widely use in various aspects. Taking it to education, will from different design architecture to make learner get deeper understanding of operating system mechanisms. Fiasco is a real, second-generation microkernel whose source code is less than 15,000 lines, and it is freely available under the GNU General Public License. In this paper, based on Fiasco, the microkernel operating system will be introduced especially in its kernel mechanism.

Low-cost airlines in web-based backpacking

Backpacking seeks the most amusement of travel only with small amount of money. Low-cost airlines help to gain this goal with the implementation of B2C e-commerce. In current web society, backpackers can communicate with each other more than before, and there are much more information about low-cost airlines in the web. Therefore, now the web helps backpackers a lot to achieve low-cost airlines to reduce the cost but promote the quality of travel.

The analysis of Wireless Sensor Networks for environmental monitoring implementation

Wireless Sensor Networks have been researched for years. The paper analyzes the implementation for environmental monitoring from both the hardware and software aspects. The framework of the programming in TinyOS-2.x has also been mentioned. Then we describe the data collection module in two ways, single-hop and multi-hop networking. The article presents the details of the implementation and describes the future work that will be carried out in the end.

A Case Study of OSS/COTS-Based System Development: Design and Implementation of an Open Scalable Network Storage Attached System

In the past decade researchers have been interested in building system based on the open source software (OSS) or commercial-off-the-shelf (COTS) more and more. Since most of functions are provided by the OSS/COTS how to choose the suitable components has to be the first issue. Now there are some models targeted this problem but we think most of existing models are impractical. Finally, in this paper we design and implement a network attached storage system as typical case study about system development based on OSS/COTS and we focus on these problems: evaluation and choice of available OSS/COTS for system with a definite requirement.

p3m: A Kernel Space Tool for Multimedia Stream Monitoring

With the development of the broadband Internet, heterogeneous multimedia service or protocols have been widely deployed, however, to monitor their quality of service (QoS) has become an important job. There are two traditional strategies: one is server-based QoS monitor depending on the specific multimedia server, such as Helix. Another is tcpdump-based, for example mmdump, which can measure the nature of multimedia traffic merely. These tools both work in the user space, which will reduce the efficiency. At present, we present p3m (portable multimedia monitor), a portable multimedia QoS monitor tool, which parses and analyzes the stream packet in the kernel space. The p3m is server-independent and can monitor the multimedia packets of interest for optional storage, thus greatly reducing resource requirements. This paper describes the design and implementation of p3m and demonstrates one instance of its utility in monitoring the QoS of RTSP with Helix Server.

Preliminary optimization analysis with envelopes for robot motion

The area of robots contains various kinds of computing requirements. For motion planning or path finding, one of the key issues is to implement the mechanism of collision detection for avoiding contact in the robot trajectory between the robot and surrounding objects. Based on some basic geometric models, this paper presents the preliminary analysis for collision detection at first, and then envelopes are introduced for optimization. All the approaches are simulated in a virtual scenario provided by a freeware of robot simulator.