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This paper models 1-out-of-N standby computing systems with a dynamic checkpointing policy. The system performs a real-time mission task that has to be accomplished within an allowed mission time. During the mission, to facilitate an effective failure recovery the system undergoes checkpointing procedures according to a policy that dynamically determines a checkpointing frequency based on the activated...
Operator situational awareness in Nuclear Power Plant (NPP) control rooms is quintessential in ensuring plant safe operation. Towards improving situational awareness, a novel framework of the EYE - Expert Supervisory System capable of visually monitoring human machine interfaces (HMI) in cyber physical system (CPS) is proposed with target application in NPP control room environment. EYE applied on...
Because the phenomenon about unreasonable arrangement of college students' class hour is relatively common, the system designed a public colleges and universities ordering system based on WeChat. This system took use of convenience and openness of WeChat, which can tremendously simplify the development and promotion. At the same time, online ordering for the students provided a convenient way of eating,...
The increasing penetration of variable and uncertain generation from renewable resources poses a challenge for balancing the power system supply and demand. Violations of this constraint seriously impact system reliability and thus carry with them a very high cost. In order to address the issues created by variable generation increased system flexibility is required. System operators are considering...
In this paper we evaluate the impact that a Computer Supported Collaborative Marking (CSCM) system has on the marking process of a highly subjective judging task. To do so, we evaluated the inter-rater reliability of reviewers in charge of marking written essays and the time required to perform such task. We analyzed the results of two groups of markers: the experimental group first marked 5 essays...
Nowadays, with the rapid development of distributed computing, message distribution has been more and more important to distributed systems. Kafka was developed to collect and distribute massive messages for distributed systems. It is a high-throughput distributed messaging system. Kafka can always keep stable performance even if it processes millions of messages per second. Messages are persistent...
Tracing is one of the preliminary activities for children in the process of learning to write Jawi characters. Jawi characters tracing activities using digital technology with a real-time feedback is one of the new technologies in teaching and learning Jawi writing in which children perform tracing activities on a tablet using a stylus pen as an input of Jawi characters tracing. The tracing engine...
The communication subsystem of distributed embedded systems (DES) that must operate continuously and satisfy unpredictable requirement changes must be reliable and flexible. Recently the Flexible Time-Triggered Replicated Star for Ethernet (FTTRS) has been proposed as a communication subsystem that satisfies these two attributes. It is based on the master/multi-slave Flexible-Time Triggered (FTT)...
In this paper, we focus on task scheduling problems in security-critical real-time systems. We consider that all of the critical tasks are equipped with RC5 algorithm to reduce the vulnerability when facing security attacks. The relationships among security level, vulnerability and execution time of each task are firstly deduced. Then, a Multiple Task Vulnerability Optimization Method (MTVOM), which...
In this paper a new design for the low cost but high expansibility with practical multi-function vehicle electrical switch box is proposed, which uses the microchip company's PIC18F45K80 as the core. The system components and the overall program are described, focusing on the design and implementation of the software modules. How to combination the CAN bus technology and SAE_J1939 protocol in the...
This paper presents a indices-based dispatching support system which provides a hierarchical multi-level multi-department structure to combines a management-level and technical level to the system operators. By digging a “past” state, monitoring a “present” state and forecasting a “future” state, a comprehensive system operation can be realized. The advanced dispatching operation can be further provided...
To increase reliability and real time of the unmanned surface vehicle (USV), research on system design and implement of USV was completed. Introduces the hardware architecture of the control system and clarifies the function of all parts. The software architecture is designed based on the VxWorks real-time operating system. The USV control system adopts a three layered hierarchical architecture, includes...
Utilizing a heterogeneous multiprocessor system has become a popular design paradigm to build an embedded system at a cheap cost. A reliability issue, which is vulnerability to single event upsets (SEUs), has not been taken into account in a conventional IC (integrated circuit) design flow, while chip area, performance, and power consumption have been done. This paper presents a system design paradigm...
This paper presents a real-time electro-thermal simulation system which is a novel method of estimating the junction temperatures of power semiconductors. It calculates the junction temperatures of the power semiconductors in real time. The load current and the output voltage of an actual power conversion system are detected to calculate the instantaneous power loss. The detected output voltage is...
Wireless LAN can quickly and conveniently resolve the problems of network connectivity, which are difficult for LAN based on wire. Basing on above advantages and the application of Figure Skating, we develop the real-time judging system of Figure Skating. It implements the video replaying which bases on DirectShow technology of COM criteria. The system is not only characterized by excellent mobility,...
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