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.
IEC 61850 is an international standard for digital substation automation systems based on network communication platform. It has been widely used in power generation, transmission, distribution and scheduling. The protocol implemented unified modeling for object, enhanced interoperability and interchangeability between different terminals. In this paper, we apply the protocol is to power and environment...
This paper presents a new way to implement four by four MIMO antennas in a mobile terminal. By properly choosing the position of the feeding and shorting pin on only one radiator, the proposed design can offer four decoupled and uncorrelated antenna ports. All of the four antennas resonant at the 3.5GHz band. The superiority of the proposed antenna is verified by measurement. Measured S-parameter,...
This study presents a newly modified unidirectional bowtie antenna with dual-band operation. The proposed antenna consists of two bowtie dipole elements, a square loop, a parallel-strip line (changed from a microstrip line), and a ground plane. The dual-wideband operating characteristics of this antenna are achieved by means of the square loop. Experimental results show that the proposed antenna has...
Two wideband microstrip patch arrays sharing a common aperture are designed for GSM, DCS and UMTS cellular deployment in this paper. The proposed arrays consist of a lower band array with 4 elements and an upper band array with 4 differently sized elements. The design of proposed shared aperture arrays helps to reduce the aperture size. In contrast to the lower-band element, two pieces of rectangular...
In this paper, we address the fault-tolerant routing problem in a heterogeneous wireless sensor network consisting of several resource-rich supernodes, and large number of energy-constrained sensor nodes. We propose the immune cooperative multi-particle-swarm algorithm (ICMPSA) to provide fast routing recovery method, in order to maintain K disjoint paths from each source node to the nearest supernode,...
A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann constant k by comparing electrical and thermal noise power. A measurement with an integration period of 10 hours and bandwidth of 640 kHz results in relative offset of 0.5×10−6 from the current CODATA value of k, and type A relative standard uncertainty...
As there are many noise influences such as speckle noise in the reconstructed object light field, how to obtain a high quality wrapped phase image is one of the most important part in holographic interferometry. The principle of holographic interferometry is introduced and a new algorithm for holographic interferometry is put forward. And it is also verified by experiments. The experiment result shows...
The maximum principal stress, von Mises equivalent stress, equivalent creep strain in dissimilar welded joints between martensitic heat-resistant steel (T91) and bainitic heat-resistant steel (G102) are simulated by FEM under the conditions of 833K and inner pressure of 28MPa. The results show that the maximum principal stress and von Mises equivalent stress are quit high in the vicinity of weld/G102...
One key step in text mining is the categorization of texts, i.e., to put texts of the same or similar contents into one group so as to distinguish texts of different contents. However, traditional word-frequency-based statistical approaches, such as VSM model, failed to reflect the complicated meaning in texts. This paper ushers in domain ontology and constructs new conceptual vector space model in...
A model of architecture for cross-layer interactions is crucial to the design, analysis, and optimization of network protocols for wireless ad hoc networks. While a various number of research works have been conducted on different aspects of the cross-layer design, very little attention has been given to modeling the cross-layer design and standardizing the open architecture issues. This paper presents...
The central idea of cross-layer design is to optimize the control and exchange of information over multiple layers to achieve significant performance improvements by exploiting the interactions between various protocol layers. In order to maintain the advantages of the existing layered architecture and to preserve the modularity of protocol stacks to the great extent possible, a novel cross-layer...
Due to the dynamic topology, limited resources and unpredictable channel conditions, the strict layered design is not flexible enough to cope with the wireless ad hoc and sensor network environment. This paper presents an in-depth analysis of difficulties in cross-layer design and the latest cross-layering approaches for wireless ad hoc and sensor networks. According to the number of layers involved...
The Zhesang gold deposit is located in southeast Yunnan of the “Golden Triangle” area. Carrying out geochemical survey and delineating the boundary of the gold anomalies, around the mine area, is of significant guiding for further geological exploration. According to 1:50000 soil geochemical survey, 10 square kilometer anomaly area was delimited, in which six highly anomalous places exist. Dingjieshan...
In order to suppress the installation errors of photoelectric payload and increase the precision of target location using photoelectric payload equipped on the aerial mobile platform, a new method of calibrating fixing errors dynamically is proposed based on quasi-linear model. The method analyzes the relationship between measurement data and true value and comes to a quasi-linear conclusion between...
A novel particle filter algorithm is proposed to track a variable number of targets in acoustic sensor networks, where the sensor data represent measurements of acoustic signals from one or more targets and background noise. The algorithm is based on the scheme of which assumed that at most one target may change between two time instants. The algorithm firstly estimate the number and identities of...
An identification method based on multiple template vector quantization is proposed through extracting LPC characteristic from acoustic target under noise surroundings. This paper introduces an approach for training acoustic target codebooks in the battlefield using multiple session training samples with every target having multiple codebooks. Finally target is identified by vector quantization. Simulation...
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.