Multitasking Operating System Research Articles

Multi-Threaded Data Communication in Java for Advanced Computing Environments

The performance of operating systems like computers requires the proper functioning of the computer language interpreter. This interpreter follows various types of programming languages that make the performing of computer programming easy and effective. The application of the programming language of Java helps in processing multiple tasks at once. This research analyzes the novelty of Java-based data communication models in advanced computing services. This performance makes the saving of the resources used for the development of the programming language. All these development includes the performing of the multiple threads communication data processing. These multiple threads help distribute the single processed input in the multi-channel language processing, thus helping the work competition in time. It also reduces the cost of maintaining the programming languages reduced. Thus, the implementing cost of resources required for programming performance is reduced. Therefore, this implementation impacts the programmer to become more indented to use the language transformation process of Java. Moreover, it creates a more effective representation of the audio or visual content represented by a multi-tasking operating system. In this process of development in the language transformation of the operating system, the ability of the operating system for data processing improves. The systematic process of this language transformation helps in systematically transforming multiple programs at once.

Development of main functional modules for MVB and its application in rail transit

Abstract In this work, multi-function vehicle bus (MVB) controller-based Field Programmable Gate Array (FPGA) and MVB manager based on the real-time multitasking operating system were explored and developed. The function of the MVB controller data link layer was realised by using FPGA. The embedded real-time multitasking operating system uCOS-II was applied to the development of MVB manager’s processing data, device state management, message data and bus management function. The network consistency test was performed to validate data communication of MVB link layer control protocol and the management function of MVB manager; the equipment was shown to be compatible with each other and met the requirements of IEC61375-1.

Rate Control Optimization Algorithm of Ubiquitous Power Sensor Network Tester Based on Multimedia

With more and more video application scenarios and increasing complexity, the popularization of multimedia information and the urgent need to update wireless sensor networks have led to the emergence and development of wireless multimedia sensor networks. This paper focuses on the rate control optimization algorithm of multimedia-based ubiquitous power sensor network, which is mainly studied from three aspects: constructing algorithm verification platform based on multimedia technology, performance analysis, and optimization of rate control optimization algorithm based on multimedia technology. An algorithm verification platform is established based on multimedia technology. This article uses a scalable video coding method to design a client-driven scalable video transmission system. The simulation results show that the algorithm can effectively improve the video quality. The algorithm of rate control based on multimedia technology is proposed. A reliable multipath routing algorithm based on AODV is proposed. Based on the energy balance algorithm, the node-independent routing mechanism and link quality estimation model are introduced. An independent and reliable active/standby communication link to the node of the destination node is established. Linux, the full name of GNU/Linux, is a free-to-use and freely disseminated Unix-like operating system. It is a POSIX-based multiuser, multitasking, multithreaded, and multi-CPU operating system. With the development of the Internet, Linux has gained support from software enthusiasts, organizations, and companies all over the world. In addition to maintaining a strong momentum of development in servers, it has made considerable progress in personal computers and embedded systems. Under the Linux platform, a large number of tests are performed and the performance of the control code rate is analyzed. The so-called sensor network is a distributed intelligent network system that is composed of a large number of small sensor nodes with wireless communication and computing capabilities deployed in the active area through a self-organizing method that can autonomously complete designated tasks according to the environment. The distance between the nodes of the sensor network is very short, and the multihop wireless communication method is generally used for communication. The sensor network can run in an independent environment, or it can be connected to the Internet through a gateway so that users can access it remotely. It is concluded that ABR is the most suitable rate control algorithm for video transmission. According to the CQP experiment results, the QP value set in the improved ABR algorithm is at most 40; the security from the construction of the ubiquitous power sensor network to the final monitoring data collection and upload process is verified by simulating the hypothesis attacks and faults. It is proved that the construction of ubiquitous power sensor network can reduce the energy consumption and delay of monitoring data collection and verify the superiority of constructing ubiquitous power sensor network.

PERANGKAT LUNAK SIMULASI DEADLOCK MENGGUNAKAN ILUSTRASI DINING PHILOSOPHERS PROBLEM

The operating system must be able to control resource usage. In the process of designing the operating system, there is a common foundation called kongkurensi. Processes called kongkuren if processes (more than one process) are at the same time. This is called the multitasking operating system. Kongkuren processes can be completely independent of the other but can also interact with each other. Processes that require synchronization in order to interact properly controlled. However, the processes that interact kongkuren, there are problems to be solved such as deadlock and synchronization. Deadlock occurs because a set of processes in a block where every process of bringing a resource and waiting to get the resources brought by another process so there is a wait state which will never expire (deadlock).Dining Philosophers Problem is an illustration of the possibility of a deadlock, a condition in which two or more processes can not continue its execution as they waited for the use of resources. Dining Philosophers problem can be illustrated, there are five philosophers sitting around a table. Five philosophers is an illustration of the five processes with the state of the process of mutual waiting to use the resources.The results of this study are to describe the state of software deadlocks using illustrations dining philosophers problem with illustrations of all the philosophers were in a state of hunger and holding chopsticks in hand to the left, there will be a deadlock condition.Keywords: deadlock, dining philosophers problem, simulation

A novel fuzzy decision-making system for CPU scheduling algorithm

In this research article, we present a novel fuzzy decision-making system to improve CPU scheduling algorithm of a multitasking operating system. We add intelligence to the existing scheduling algorithms by incorporating fuzzy techniques in the selection of a process to be run on CPU, which result in improved waiting and turn-around times. We implement our proposed algorithm as a simulator using C language. The simulator implements our fuzzy scheduling algorithm, reads the required parameters of all the ready to run processes from a file, and finally computes a dynamic priority (dpi) value for each process. The run queue is sorted according to each process's dpi, and the process at the head of the queue is selected to run on CPU. Finally, we compare our results with some existing proposed fuzzy CPU scheduling (PFCS) algorithms as well as with some standard CPU schedulers. Our results show improvements as compared to the work of Ajmani's PFCS (Ajmani and Sethi in BVICAM's Int J Inf Technol 5:583---588, 2013), as well as from Behera's improved fuzzy-based CPU scheduling algorithm (Behera et al. in Int J Soft Comput Eng 2:326---331, 2012). Our efforts contribute to the overall efforts of the community contributing to the fuzzification of different operating system modules. These efforts finally result in an operating system that gives convenience to its users in both certain and uncertain environments and at the same time efficiently utilize the underlying hardware and software under precise as well as fuzzy conditions (Kandel et al. in Fuzzy Sets Syst 99:241---251, 1988).

Realization of Interrupts and Time Management of a Sensor Network Operating System

μOS, the operating system of microkernel wireless sensor network, is a real-time multi-tasking operating system; and its main function modules include task management, time management, interrupt management, energy conservation mechanism and communication protocol. Thereinto, its time management and interrupt management is the basis of other functional modules. The author designs and realizes clock management and interrupt management for microkernel wireless sensor network operating system μOS. It is shown from system performance tests such the time management and interrupt management are capable of satisfying real-time requirements in the system.

Design and Realization of Semaphore for a Sensor Network Operating System

μOS, the operating system of microkernel wireless sensor network, is a real-time multi-tasking operating system; the author designs a semaphore synchronization mechanism and works out mutex semaphore in the paper, in order to avoid errors resulting from resources sharing by multiple tasks in a competitive manner. It is shown from experiments that the mechanism is capable of synchronizing and multi-excluding in μOS more effectively, thus optimizing kernel synchronization and mutex in a simpler and more efficient manner.

Research on Wireless Sensor Networks Based on Open Source System

As the key technologies such as wireless communication, sensor continues to mature, wireless sensor networks has become a domestic and foreign focus of research in the field of wireless networks. The main work of the thesis is to implement ZigBee wireless sensor networking, using open source protocol FreakZ On the base of existing hardware. WSN hardware node consists of 32-bit microprocessor STM32F102CB based on ARM Cortex-M3 kernel and AT86RF212 radio transceiver; the software platform uses a lightweight multi-tasking operating system Contiki and open source protocol stack called FreakZ following ZigBee protocol specification, for networking wireless networks nodes. The paper presents the system architecture of WSN networking and its hardware components, software architecture and data transmission and reception processes of the networks. Using FreakZ protocol stack under the Contiki operating system on the base of the existing hardware platform, the network nodes information and topology displayed on the HyperTerminal indicates the success of WSN networking by using FreakZ protocol.

Software Design of Measurement and Control Device for Smart Grid Based on Embedded Operating System

Real-time multi-task embedded operating system is widely used in intelligent electronic devices. But the software design method with embedded OS is not familiar to developers in power system. So this paper depicts a sophisticated solution to overcome the difficulty in embedded software design. An overall software design is achieved in detail, and the emphasis is software architecture design, interrupt and task allocation and communication interface. After field validation, the measurement-control devices designed by this design solution have been proven that it is well adapted to the new requirements of Smart Grid.

The Design and Implementation of RTOS Based on YL-236 Single Chip Microcomputer Training Device

Using the equipment, YL-236 single chip microcomputer (SCM) control device installation and debugging training platform, used in the SCM event of the National Vocational Students Skills Competition (NVSSC) as hardware carrier, this paper researched the application method of real-time operating system (RTOS) in the implementation of the SCM Skills Competition task, and apply the real-time multitasking operating system (RTMOS), RTX51, in the 8-bit 51 SCM. That allows switch of circulation tasks, supports the signal transmission, utilizes the interrupt function in parallel, and has very small demand for RAM. That makes whole SCM task to develop much easier and more convenient, and enhances the real-time performance and reliability of the SCM Skills Competition task at the same time.

Research and Development of Automatic Control System on Material Split Packing and Packaging Integrated Machine

In order to meet the high speed, high precision, high reliability of the packaging machine, a novel control system is provided. In the hardware, the main circuits consisted of main processor module, memory module, temperature measurement and control module, input signal detection module, material split packing module, output driver module, human-machine interface module, system monitor module, power module and JTAG debug module, etc. In the software, the multi-tasking operating system μC/OS-Ⅱ and the graphical user interface μC/GUI were successfully transplanted into LPC2478. Then an experimental platform was established. And many control tasks, including automatic measurement, making bags, loading, transferring, pumping vacuum, sealing and data display, were automatically and continuously executed on the platform. Finally the results show: the machine can package 30 packets (5 g per packet) in a minute; the packaging errors ≤ 0.2 g; the packaging qualified rates ≥ 93%. In conclusion, the system performance is good.

Research on Distributed Multi-Axis Motion Control System Based on CANopen

The 32-bit ARM Cortex-M3 core processor Stm32f107vc which integrates two sets of bxCAN interfaces is used as hardware platform to achieve the design of hardware module and software module in this paper. Firstly, real-time multi-tasking operating system μCOS-II is ported to stm32 processor, then open source protocol stack microCANopen which is high real-time and reliable is transplanted under the μCOS-II, so a design of CANopen slave station is achieved. The CAN analyzer which is equipped with monitor trace functionality is used as CANopen master station to start the network, with three CANopen slave stations and one HMI, a distributed multi-axis motion control system based on CANopen which achieves network management and synchronous transmission of data in distributed control system is designed. On above basis, Fuji ALPHA5 Smart servo is used as executive member, modular design of reconfigurable motion control algorithm is realized, furthermore, The flexible module configuration enables the designer to develop systems conveniently according to the change of control requirement and network topology. This distributed control system not only has good real-time performance and stability, but also can reduce the complexity, enhance the flexibility of control system and save cost.

The Functional Design on Fault Recorder of μC/OS-II-Based Intelligent Substation

Regarding the functional requirements for smart substation in fault recorder, this paper introduced μC / OS-II, an embedded real-time multitasking operating system as the functional design. The program works with the embedded operating system, the state machine theory and new methods for embedded development, whilst tasking full use of the advantages of such functions as task scheduling, message queues, etc., aiming to achieve a fault recorder function of intelligent substation. More than taking care of the difficulty of programming, it could improve the program reliability and portability. The program has been applied in an intelligent substation protection in centralized control unit, which has brought back a good fault recorder performance. On this basis, more functions can be integrated, including network log analysis, state estimation, etc., in order to truly meet the application requirements of the smart substations.

A fast compass alignment method for SINS based on saved data and repeated navigation solution

Compared with Gimbaled Inertial Navigation System (GINS), there are two differences in the compass alignment process for Strapdown INS (SINS) as follows: (1) the input signal is the projected sensor data from body frame to calculated navigation frame, not the sensor data; (2) the output control signal participates in navigation solution rather than driving navigation frame directly. Considering these characteristics, a fast compass alignment method based on iterative calculation is designed for SINS in this paper. With the help of high performance computer, the iterative process can be finished fast and the alignment time can be shortened obviously. However, there exist two problems in the new method, one of which is how to use the saved data, and the other is how to ensure the real-time property of alignment result. For the first problem, our simulation result shows that the forward–forward navigation solution method is more effective for compass alignment than the backward–forward one. And to solve the second problem, Multi-tasking method combined with Real Time Multi-tasking Operating System (RTOS) is used to trace the change of body frame and update the body frame of attitude matrix when the alignment is finished. The car test on a type of fiber-optic gyro SINS indicates that the alignment accuracy of the proposed method processed for 142s is as precise as that of the classical compass alignment method for 720s.

Research on the Implementation of Porting uC/OS-II on the STM32F103 chip

This work show how to port μCOS-II kernel and to build the ARM cortex-m3 hardware platform. This program researches how to drive the basic external devices. This paper gives a detailed discussion that the driver programs of the underlying hardware is how to be expanded into the uC/OS_II to process the tasks from the platform. The applications can make the STM32 processor work normally by calling the functions of transplanted uC / OS_II. The system is an actual embedded real-time multi-task operating system. The speed of processing multi-tasks is faster than conventional micro-controller’s. Because this system can run the highest priority task without return to the while loop. At last, this paper gives the structure of the main framework, the code of the tasks. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2839

Robotic goalie with 3 ms reaction time at 4% CPU load using event-based dynamic vision sensor

Conventional vision-based robotic systems that must operate quickly require high video frame rates and consequently high computational costs. Visual response latencies are lower-bound by the frame period, e.g., 20 ms for 50 Hz frame rate. This paper shows how an asynchronous neuromorphic dynamic vision sensor (DVS) silicon retina is used to build a fast self-calibrating robotic goalie, which offers high update rates and low latency at low CPU load. Independent and asynchronous per pixel illumination change events from the DVS signify moving objects and are used in software to track multiple balls. Motor actions to block the most “threatening” ball are based on measured ball positions and velocities. The goalie also sees its single-axis goalie arm and calibrates the motor output map during idle periods so that it can plan open-loop arm movements to desired visual locations. Blocking capability is about 80% for balls shot from 1 m from the goal even with the fastest-shots, and approaches 100% accuracy when the ball does not beat the limits of the servo motor to move the arm to the necessary position in time. Running with standard USB buses under a standard preemptive multitasking operating system (Windows), the goalie robot achieves median update rates of 550 Hz, with latencies of 2.2 ± 2 ms from ball movement to motor command at a peak CPU load of less than 4%. Practical observations and measurements of USB device latency are provided1.

单侧Jacobi矩阵求逆算法及其DSP实现

链路自适应与先进接收机是宽带无线通信系统的核心技术，其设计与实现均涉及大量的矩阵分解以及矩阵求逆运算，提高矩阵分解和矩阵求逆运算的效率是提高宽带无线通信系统传输效能的基本途径。针对此目的，本文提出一种在经典Jacobi算法上改进的单侧Jacobi算法。由于该算法具有并行的特性，相比于串行（单核）实现在指令执行周期数上可提高至少两倍的运行效率。本文首先重点介绍改进的单侧Jacobi算法和TMS320C6474 DSP的内部架构与特性，然后重点阐述结合TI的实时多任务操作系统内核(DSP/BIOS)并行实现此算法，最后在同样精度的计算结果下比较并行算法与串行算法指令执行周期数，由此验证改进的单侧Jacobi算法在并行实现上的高效性。 Link adaptive transmission and advanced receiver are two key technologies in broadband wireless communi- cation system. The design and realization of the system both involve a large number of matrix decomposition and inver- sion. The basic way to improve transmission efficiency of broadband wireless communication system is to enhance the efficiency of matrix decompose and inverse computations. For this purpose, this paper develops a kind of one-sided Jacobi algorithm based on classic Jacobi. Since this algorithm has the characteristic of parallelism, it can increase the efficiency at least twice in terms of the instruction execution cycle numbers. This article will first focus on the im- proved one-sided Jacobi algorithm as well as internal architecture and characteristics of DSP TMS320C6474. It then elaborates on how to implement this algorithm in parallel using TI’s real-time multi-tasking operating system kernel (DSP/BIOS). Finally, this paper will compare instruction execution cycle numbers between parallel and serial algorithm under the same accuracy, proving the high efficiency of the improved one-sided Jacobi algorithm.

SEProf: A high-level software energy profiling tool for an embedded processor enabling power management functions

Energy efficiency has become one of the most important design issues for embedded systems. To examine the power consumption of an embedded system, an energy profiling tool is highly demanded. Although a number of energy profiling tools have been proposed, they are not directly applicable to the embedded processors with power management functions that are widely utilized in battery-operated embedded systems to reduce power consumption. Hence, this study presents a high-level energy profiling tool, called SEProf, that estimates the energy consumption of an embedded system running multithread software and a multitasking operating system (OS) that supports power management functions. This study implements the proposed SEProf in Linux 2.6.19 and evaluates its performance on an ARM11 MPCore processor. Experimental results demonstrate that the proposed tool can provide accurate energy profiling results with a low profiling overhead.

Design and Implementation of the Embedded Based Web Camera System

This system is composed of the frontal network camera and the remote monitoring client. Firstly, it introduces the whole system structure design and the definition of functions. This embedded web camera takes the powerful ARM9 chip as MPU. The camera captures the video through embedded multitask operating system and the digital video has been compressed by the JPEG algorithm. The general users can view video collected directly by the camera in internet explorer. The authorized users can also control the motion of the camera and configure the parameters of the embedded web camera straightly by Common Gateway Interface.

The Study of Target Tracking Based on ARM Embedded Platform

This article explored a solution of target tracking based on the ARM embedded platform, which gave a design and realization of removable image processing equipment to detect and track the pedestrian in the video. The integration level of embedded platform is very high, embedded platform supports real-time multitasking operating system, and comply with the requirements of real-time and miniaturization. Studying how to combine embedded platform with target tracking, it has instructional significance for robot development applications.