The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
For comparing the stability and reliability of horizontal, vertical and flip LED chips, we carried on the high temperature and high current aging experiment towards to the three kinds of bare LED chips on our self-build online monitoring and accelerated life system. Most of samples shown stable performance during the entire experiment process, but there was only one flip LED chip whose illuminant,...
The design of the system is based on ZigBee and the greenhouse environment is detected by a slave computer. The data collected will be transmitted to a host computer to do the specific operation. That is, by displaying and controlling greenhouse parameters in real time, the host computer can realize real-time monitoring and control of greenhouse temperature, humidity, light, air quality and other...
This paper investigates the problem of link scheduling in a single-hop energy harvesting wireless body area network (EH-WBANs) where sensor devices's energy harvesting rates and data rates are spatially heterogeneous and temporally variant. To maximize the channel utilization with the lifetime operation, an adaptive TDMA-based protocol (AT-MAC) is proposed, which is suitable for communication in an...
In this article, the hardware system of radionuclide monitoring and the test results are introduced. The analysis of the digital pulse signal through the pretreatment circuit, high-speed ADC and the FPGA, can obtain the signal amplitude, time, pulse shape etc, and then the marine radioactivity can be obtained. This system can be used to monitor the marine radionuclide.
Autoscaling involves complex cloud operations that automate the provisioning and de-provisioning of cloud resources to support continuous development of customer services. Autoscaling depends on a number of decisions derived by aggregating metrics at the infrastructure and the platform level. In this paper, we review existing autoscaling techniques deployed in leading cloud providers. We identify...
Vibration acceleration detection of spindle monitoring requires that the accelerometer has an adequate measurement sensitivity and response frequency above the interested range. This paper aims at design a kind of micro-electro-mechanical system (MEMS) accelerometer that can be used in the spindle component's vibration detection. To measure the vibration acceleration of the high speed spindle accurately,...
Maize is one of China's major grain crops, it occupies a pivotal position in northern China. So there is great need to be informed the abreast of maize acreage, growth and yield of maize production timely for the management, price of macro-control and foreign trade. Implement yield estimation by RS is more advanced than any other traditional statistical methods in agricultural development. To obtain...
Nonintrusive load monitoring (NILM) has been developed for decades in load monitoring and disaggregation. Methods of digital signal processing and statistical modeling have been applied in detecting state change events, extracting the load signatures, identifying individual device load for disaggregation, and parameterizing the transient of devices for diagnosis. In this paper, we discuss the challenges...
Research on sensor network has been focused at overcoming these deficiencies through more energy efficient routing, localization algorithms and system design. This paper tried to discuss some application related challenges, such as data integration, data storage, metadata generation, data fast query. We use analytical data management concept to create a virtual layer, which maps the real sensor network...
Total projection to latent structures (T-PLS) has been used for quality-related process monitoring. Compared to PLS, the T-PLS is more effectively in detecting the quality-related abnormal situations for linear and static processes. To describe the nonlinear and dynamic process characteristics, a new monitoring approach, dynamic total kernel projection to latent structures (DT-KPLS), is proposed in...
For the classical BP algorithm has some deficiencies, such as the accuracy is insufficient, the rate of convergence does not descend, weight value closes to zero. This paper proposes the AB neural network to adjust the step and the hidden-layer neurons algorithm based on BP network. Network A with learning ability configures and adjusts the structure of Network B and trains it, by adjusting the step...
According to the study on risk identification, risk estimation, risk assessment and risk control of monitoring-based deep excavation engineering, a set of feasible risk management system of deep excavation engineering is built up in this paper. The expert surveys method (including Delphi), fault tree analysis, checklist are used in identifying risk factors in deep excavation engineering. The risk...
Exceptions cause temporal failures of Web-based systems to deliver continuous and responsive end-to-end services. On cloud platforms, resource provisioning and administration become less explicit, which entails techniques that can act on exceptions according to known strategies. In this paper, we propose a middleware-based approach that encompasses a healing process that links available strategies...
This paper presents a kind of TOC (Total Organic Carbon) based on the dynamic method of chemiluminescence, which utilizes ozone oxidation and organic pollutants to conduct oxidation reaction and chemiluminescence, then combines the detection technique of glimmer photoelectric conversion and the time-series integration method carried out on the curve of luminescence kinetics to realize the rapid and...
System anomaly detection is very important for development, maintenance and performance refinement in large scale distributed systems. It's a good way to obtain the troubleshooting and problem diagnosis by analyzing system logs produced by distributed systems. However, due to the increasing scale and complexity of distributed systems, the size of logs must be very large. Thus, it's inefficient for...
With the widespread usage of RFID technology, complex event processing becomes a very important part in RIFD system. In order to improve the working efficiency of the system and provide semantic results to the enterprise application, it is necessary to transform the raw RFID data into meaningful events. However the RFID data stream has unique features compared with the traditional data stream such...
Contour mapping is an energy-efficient method for geographic correlated value monitoring in Wireless Sensor Networks(WSNs), it suppresses reporting nodes by selecting nodes that are on a contour line. A sensor network is often densely deployed in applications such as temperature or humidity monitoring. In these applications, contour mapping plays a crucial role in data aggregation and data transmission...
In some oil fields, the consumption of electricity and energy was very high because the beam pumping unit worked sustained, expect in the height period of electricity consumption. It increases the burden on the grid and make machines wearied easily when voltage instability. In this paper, we propose a concept of intermittent pumping to beam pumping unit and build a monitoring system of oil wells based...
Quality of individual services is substantial to guarantee high performance and availability of overall composite service oriented systems. This requires the process of diagnosing service quality degradation and responding to it in a timely and non-stopping manner. This paper presents a modeling-based approach to coordinate the process of Web service management, configuring parameters or invoking...
An on-line monitoring system for the insulation condition of capacitive-type equipment is described. The system adopts a distributed and layered multi-CPU structure, which is composed of the on-site measuring and processing unit, and data management and diagnosis system in the control room of substation. The on-site measuring and processing unit is based on DSP+FPGA hardware platform. Thus, the hardware...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.