Impedance of low voltage power line have important effect on performance of power line communication. This paper presents measurements and analysis of the impedance of several electric loads and ...communication nodes on low voltage residential distribution network at frequencies from 80kHz to 500kHz. These measurement results are valuable and provide important reference on power line communication architecture design.
Profiling and tracing mechanisms are vital to identify performance bottlenecks for the optimization of modern multi-threaded applications 1. While profiling generates a summary of averaged ...performance metrics, tracing provides a full record (trace) of timestamped events 1. Hence, tracing is mandatory for detailed timing analysis but is usually difficult to implement. First, the generated traces can get large which usually results in a high overhead to record them. Second, lossless traces (no events get lost) with precise timestamps for correct event ordering across large multi-core systems are challenges for common tracing mechanisms. As a complementary approach to existing tracing mechanisms, we introduce GLS Tracing (Gem5-based Low-intrusive Software Tracing), which overcomes the mentioned challenges. GLS Tracing combines the flexibility and fine granular resolution of software tracepoints (TP) with the low-intrusive system analysis capabilities of the Gem5 simulator. Using new Gem5 pseudo-instructions (Trace Point Operation, TPOP), the time-consuming recording of a native TP in software tracing is offloaded to the Gem5 Full-System simulator, thus reducing the number of CPU cycles to be simulated for this tracing. This new tracing capability is integrated into the native Linux kernel software TP infrastructure TRACE_EVENT, resulting in an average overhead reduction of 93% per recorded TP (from on average 2300 clock cycles down to 160 clock cycles). In addition, a less flexible but almost non-intrusive TP is defined that adds only 5 to 10 cycles overhead per TP. This provides a lossless low-intrusive tracing solution for Gem5, which can be used in both user-space and kernel-space functions.
Human NKX2.5 (NK2 homeobox 5) premature stop codon (PTC) mutations cause congenital heart diseases such as atrial septal defect and atrioventricular block. At present, eight NKX2.5 PTC mutations were ...reported as E109X, Q149X, Q170X, Q187X, Q198X, Y256X, Y259X and C264X. To observe the ability of tRNA suppressors to read through NKX2.5 PTC mutations and produce functional full-length proteins, eight NKX2.5 PTC mutations were cloned into pcDNA3.1(-) vectors and four fragments (wild-type NKX2.5, E109X, Q149X and C264X) were cloned in pEGFP-N1 vectors to acquire NKX2.5-EGFP fusing plasmids. After transfection of NKX2.5-EGFP with or without corresponding tRNA suppressor into HeLa cells, the quantity of EGFP was measured to confirm the readthrough ability of the PTCs. NKX2.5 full-length and truncated protein expression levels were examined by Western blotting and the readthrough efficiency of tRNA suppressors on the PTCs was calculated respectively. The activity of NKX2.5 full-length and truncated protein was confi
A Goal Model of Autonomous Agent Organization Zhigang Huang; Pengyi Gao; Min Sun ...
2009 International Conference on Computational Intelligence and Software Engineering,
2009-Dec.
Conference Proceeding
When a task is received by an agent organization in multi-agent system (MAS), it should be partitioned into multiple subtasks which will be assigned to suitable agents to be pursued. A goal model of ...autonomous agent organization (GMAAO) is proposed in which a trigger mechanism of event is added to the traditional "AND/OR" task decomposition tree to deal with the event-driven feature of MAS, and the task decomposition method can reduce the task cost greatly. A case study shows that the creation of goal instances is triggered by event dynamically, and the task overhead can be reduced since the task decomposition path with lowest overhead can be chosen.
Distribution network reconfiguration is the main measure of distribution network optimization, its purpose is to determine the optimal topology of distribution network, is an effective measure to ...reduce network loss, its mathematical essence is a complex multi-objective nonlinear combinatorial optimization problem. This paper first introduces the methods of distribution network reconstruction, which are divided into three categories: heuristic algorithm, artificial intelligence algorithm and mathematical programming algorithm. It simply analyzes the advantages and disadvantages of three kinds of distribution network reconstruction algorithms, and then analyzes three commonly used distribution network reconstruction algorithms: switch opening and exchange (SOE),Mixed Integer second-order Cone Programming (MISOCP) based on DistFlow model and optimal matching loop flow method. Finally, IEEE33 nodes are used to test the effectiveness of three kinds of distribution network reconstruction methods. After comparative analysis of three kinds of distribution network reconstruction methods, it is concluded that SOE method is a more accurate and efficient method to solve the distribution network reconstruction problem.
The energy internet is a cyber-physical system (CPS) to connect directly and indirectly the devices of information, communication, control, and protection to effectively generate, transmit, use, and ...store various energy by merging new technologies such as artificial intelligence (AI), cloud computing, and blockchain, etc. Recently, AI technology has become increasingly popular in many research and industrial fields because it can perform tasks well. However, applying AI technologies to energy internet is relatively less. Therefore, in this paper, the potential applications of AI technologies in the energy internet will be reviewed and discussed. In section II and section III, the operating and monitoring of power systems are the main parts to discuss. Firstly, applying AI technologies to the operation of control, optimization, and decision-making in power systems will be detailed in section II from three aspects such as existing problems, potential demands, and valuable improvement. Secondly, in section III, detecting faults and analyzing stability by energy internet monitoring is mainly discussed. Finally, in section IV, it shows an example using the neural network to analyze the power flow of a standard IEEE 39 nodes power system compared with traditional Newton-Raphson method.
Fine structured multiple-harmonic electromagnetic emissions at frequencies around the equatorial oxygen cyclotron harmonics are observed by Van Allen Probe A outside the core plasmasphere（L~5） off ...the magnetic equator（MLAT~.7.5°）during a geomagnetic storm. We find that the multiple-harmonic emissions have power spectrum density（PSD） peaks during 2–8equatorial oxygen gyroharmonics（ f ~ n fO＋, n=2–8）, while the fundamental mode（n=1） is absent, implying that the harmonic waves are generated near the equator and propagate into the observation region. Additionally, these electromagnetic emissions are linearly polarized. Different from the equatorial noise emission that propagates considerably obliquely, these emissions have moderate wave normal angles（approximately 40°–60°）, which predominately increase as the harmonic number increases.Considering their frequency and wave normal angle characteristics, it is suggested that these multiple-harmonic emissions play an important role in the dynamic variation of radiation belt electrons.
The approach combines both Chan's algorithm and another close-form algorithm to solve the aircraft multilateration surveillance equations. Results developed are applicable for the surveillance system ...as a final location solution or as an initial one for the iteration algorithm. However, the ambiguous problem occurs if there are only three TOA measurements. So, the approach will also focus on it and provides an advisable comment to avoid the ambiguity in the receiver stations allocation process for the surveillance system in the airport.
This paper proposes a statistical geometric model for multipath propagation of the satellite communication, which provides some insight into the spatial properties of wideband channels. The ...Closed-form explicit expressions of the probability density functions (pdf) of the time of arrival (TOA) for multipath signals and the power delay profile according to the various elevation angles of the satellite are derived, where the scatterers are located uniformly within a three-dimensional (3-D) hemisphere around the receiver. The proposed model provides the general and accurate theoretical approximations for multipath propagation channels, which is validated by the simulation. The result shows that the numerical outcomes from the model are consistent with the measurements, especially effective in urban environment, and is thus useful for analytical purposes.
In this paper, synthetic functions expansion (SFX) method is employed for improving the efficiency of the method of moments (MoM) by reducing the number of unknowns. With the geometrical domain ...decomposition, the SFs are generated from the solution of each decomposed subdomain called block in isolation under excitation by manually defined extra sources. The precision is closely related with the definition of extra sources and how to obtain enough information from the response to all resources. This paper discusses some particular factors that affect the generation of SFs and the overall performance of EM scattering computation, the rules of dealing with these factors and controlling precision and efficiency are put forward and illustrated with a series of numerical results.
