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In this paper, a novel automatic approach of computing 3D skeletons of airways is introduced, which is based on optimized double distance transform field and endpoints detection. The advanced double distance transform fields are constructed by the fast marching method (FMM). The endpoints are detected automatically combining 3D SUSAN corner detector and the local extreme value of distance from source...
Level set method for topology optimization are by now sophisticated and used in a wide variety of research areas. Level set method with mesh requires finite element analysis that is often complex and time consuming due to large sparse coefficient matrix of equations. This paper presents EBE-CG method to parallel compute large sparse linear equations for level set method based on normal conjugate gradient...
This paper proposes and analyses a method that will increase the number of voltage level of any existing topology, only thing is load should be connected across H-bridges. In order to verify the proposed cell, various existing topologies have been simulated and analyzed. The purpose of the circuit proposed is to reduce the use of IGBT switches and hence improving the Total Harmonic Distortion.
Decentralized control of networked systems has been widely investigated in the literature, with the aim of regulating the overall state of the system to some desired configuration, thus obtaining coordinated emerging behaviors (e.g. synchronization, swarming, coverage, formation control) by means of local interaction. In this paper we introduce a methodology to solve a tracking problem, that is defining...
The formation of Autonomous Underwater Vehicles (AUV) has been increasingly researched with tremendous amount of potential applications, e.g., environment monitoring or surveillance, self-localization and mapping, as well as security patrol. However, acoustic modem is almost the only instrument up to now can effectively work for multi-AUV communications, which is a big limitation in comparing with...
We propose a graph-based segmentation model that takes into account both topological information and intensity similarity to segment non-small-cell lung carcinoma (NSCLC) from PET volumes. The proposed model estimates the probabilities of each voxel belonging to the given foreground and background labels. The topological information is derived from our region of interest topological skeleton tree...
A distributed power balance strategy applied for DC/DC stage in Solid State Transformer (SST) is presented in this paper. Firstly, the essence of unbalanced power issue in dc/dc stage of SST is analyzed theoretically. Then an adapted droop method is developed. The proposed control strategy can not only distributed balance the dc/dc stage output power, but eliminate the voltage drop caused by the conventional...
Conventionally in wireless power transfer applications, symmetrical resonant tank (SRT) type, which employs an identical physical geometry for transmitter coil (Tx) and receiver coil (Rx), has been popular because it minimizes the leakage flux. However, for portable applications it is desirable to minimize size and weight of Rx, while Tx should provide stronger and more uniform magnetic field. Consequently,...
The unipolar gate driving method provides a low cost and simple solution for inverter system design. However, the unipolar gate driving can cause issues like ‘parasitic oscillation’ during turn-on of power switches and ‘unintended parasitic turn-on’ caused by the Miller-effect of power semiconductors. Hence the maximum value of gate resistance has to be limited. To overcome the above mentioned issues,...
This paper proposes the use of the modular multilevel converter (MMC) for ac-dc conversion using medium frequency transformers in a two-stage topology with unidirectional switches. The losses analysis of the propose converter are presented with a comparative studyamong others two topology well know in the literature for traction applications. The basic description of the topology and some simulation...
This paper proposes a single-phase three-level split DC-bus inverter for individual maximum power point tracking (MPPT) controls. With only eight switches and one filter inductor, the proposed system provides compact and cost-effective circuits in comparison with conventional single-phase individual MPPTs topologies. The proposed system has two split DC-buses from conventional single-phase three-level...
In this paper, cognitive secondary users (SUs) are taken into account to cooperate for messages information transmission without a data center using Belief Propagation — based framework (BP). We also exploit generalized belief propagation (GBP) to simulate individual marginal distribution of SUs in random topology networks with loops. Simulation results indicate that BP gives a substantial gain of...
This paper presents a grid connected cascade dual buck inverter with Sensorless current control method to utilize the present renewable energy structure. A grid-tie control system is proposed for cascaded dual-buck inverter with both active and reactive power flow capability in a wide range for renewable energy and distributed generation sources. A cascaded two switch dual buck inverter with two power...
Wash trade refers to the activities of traders who utilise deliberately designed collusive transactions to increase the trading volumes for creating active market impression. Wash trade can be damaging to the proper functioning and integrity of capital markets. Existing work focuses on collusive clique detections based on certain assumptions of trading behaviours. Effective approaches for analysing...
As IC technology continues to evolve and more transistors are integrated into a single chip, high chip temperature due to high power density not only increases packaging/cooling cost, but also severely degrades reliability and the performance of computing systems. In the meantime, as transistor feature size continues to shrink, it becomes difficult to precisely control the manufacturing process. The...
This paper describes continuing work on a new method for state estimation of a non-linear AC power system in a direct, non-iterative manner. This method is based on the Kipnis-Shamir relinearization technique that is used to solve over-defined sets of polynomial equations. The technique transforms the equations to a higher dimension linear space which allows the states to be solved in a non-iterative...
As complexity of VLSI circuits grows, routability has been one of the key factors considered by tree construction algorithms in global routing. Flexibility is a geometric structural property of rectilinear Steiner minimal tree (RSMT), and it is expected to accord with routability and therefore predict the overflow situation. Reference [9] proposed a new definition of flexibility of RSMT, combining...
Automatic synthesis of digital circuit is mostly solved, at a well defined boundary conditions. Algorithm of a digital topology generating can be performed. From traditional discrete electronic parts an analog circuit implementation is almost impossible, because analog integrated circuits configurable through a digital interface already exist. Automatic synthesis of analog circuits can be important,...
Following up on our previous work, we formulate a linear, loss-adjusted, shift factor mixed integer program (MIP) to co-optimize generation and network topology. While both the B-theta and shift factor topology control (TC) formulations lead to production cost saving, we showed that the shift factor formulation performs better for small to medium switch able sets. In this paper we extend the original...
Addition is a vital operation in all data paths. The power dissipation and speed performance remain the primary factors that identify the choice of adders. To achieve the desired energy efficiency or lower power dissipation, the selection of the particular adder topology plays a major role. The operating speed of adder or the circuit latency of adder can be minimized by the use of architectures such...
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