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1.Energy Dissipation During Impact of an Agglomerate Composed of Autoadhesive Elastic-Plastic Particles

Author:Liu, LF;Thornton, C;Shaw, SJ

Source:PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON DISCRETE ELEMENT METHODS,2017,Vol.188

Abstract:Discrete Element Method is used to simulate the impact of agglomerates consisting of autoadhesive, elastic-plastic primary particles. In order to explain the phenomenon that the elastic agglomerate fractures but the elastic-plastic agglomerate disintegrates adjacent to the impact site for the same impact velocity, we increase the impact velocity and lower the yield strength of the constituent particles of the agglomerate. We find that increasing the impact velocity can lead to the increased number of yielded contacts, and cause the elastic-plastic agglomerate to disintegrate faster. Mostly importantly, the energy dissipation process for the elastic-plastic agglomerate impact has been investigated together with the evolutions of the yielding contacts, and evolutions of velocity during impact.

2.Deformations of the standard model: SUq(3) flavor symmetry

Author:Gresnigt, NG

Source:XXIV INTERNATIONAL CONFERENCE ON INTEGRABLE SYSTEMS AND QUANTUM SYMMETRIES (ISQS-24),2017,Vol.804

Abstract:The quantum group SUq(3) = Uq(su(3)) is taken as a baryon flavor symmetry and exceptionally accurate octet and decuplet baryons mass relations are obtained by accounting for the electromagnetic contribution to baryon masses (to zeroth order). The resulting charge specific q-deformed octet and decuplet baryon mass sum formulas are accurate to 0.02%% and 0.08%% respectively; a factor of 20 reduction in error compared to the standard Gell-Mann-Okubo mass formulas. An explicit formula for the Cabibbo angle, taken to be pi/14, in terms of the deformation parameter q and spin parity J(P) of the baryons is obtained.

3.Usable Authentication Mechanisms for Mobile Devices: An Exploration of 3D Graphical Passwords

Author:Yu, Z;Olade, I;Liang, HN;Fleming, C

Source:2016 INTERNATIONAL CONFERENCE ON PLATFORM TECHNOLOGY AND SERVICE (PLATCON),2016,Vol.

Abstract:Current authentication systems in mobile devices such as smart phones have many shortcomings. Users tend to use simple textual passwords such as PINs, which are easily cracked by intruders. Meanwhile, graphical passwords suffer from shoulder surfing attack In this paper, a new authentication system using 3D graphical passwords, will be proposed and tested to offer more security for mobile devices. This authentication system allows users to interact with the 3D objects in a 3D virtual environment and these actions are tracked in the virtual environment and used to create unique passwords. Based on the previous studies of the 3D password scheme, this paper developed a simple testing program that enables users to create their own 3D password easily. At the end of the paper, some improvements of the program and this authentication system are discussed.

4.Application of Hough Transform Feature Extraction to Reduce Angular Vibration in Images Captured from Moving Objects

Author:Afolabi, D;Man, KL;Liang, HN;Zhang, N;Lim, EG;Wan, KY

Source:2013 INTERNATIONAL SOC DESIGN CONFERENCE (ISOCC),2013,Vol.

Abstract:This paper details an ongoing research aimed at developing computational approach to reducing/eliminating vibration and light glare in images captured by digital cameras especially when the scene contains moving objects or the camera is mounted on a moving vehicle / flying drone. The algorithms developed are focused at real-time image acquisition where the enhanced/corrected images are need almost immediately after they are captured. The results show that these methods of reducing the stated problems are effective and it can be further developed for various applications.

5.Impact of Parasitic Elements on RF Performance of Nanometre-Scale MOSFET Structures

Author:Lam, S

Source:2013 IEEE INTERNATIONAL CONFERENCE OF ELECTRON DEVICES AND SOLID-STATE CIRCUITS (EDSSC),2013,Vol.

Abstract:A recently reported nanometre-scaled MOSFET structure with regrown source and drain is examined. The parasitic circuit elements are identified and quantitatively determined to estimate their impact on the transistor's RF performance. Due to the relatively large lateral parasitic capacitances from the gate electrode to the regrown source and drain regions, the current gain cut-off frequency f(T) of such a transistor is optimistically estimated to be 184 GHz which is not impressive for nanoelectronic devices with an effective gate length of 30 nm. However, with the significantly reduced parasitic series resistances due to the regrown source and drain structures together with the use of the metal gate, the maximum frequency of oscillation f(max) can attain to 820 GHz. This brings about an implication that device structure optimization to reduce the parasitic resistances has a dominant beneficial effect on the RF performance over the negative impact caused by the increased parasitic capacitances.

6.BEYOND CODES AND PIXELS

Author:Fischer, T;De Biswas, K;Ham, JJ;Naka, R;Huang, WX

Source:PROCEEDINGS OF THE 17TH INTERNATIONAL CONFERENCE ON COMPUTER-AIDED ARCHITECTURAL DESIGN RESEARCH IN ASIA (CAADRIA 2012): BEYOND CODES AND PIXELS,2012,Vol.

7.Robust Localisation of Pedestrians with Cast Shadows Using Homology in A Monocular View

Author:Xu, M;Jia, TY;Lu, L;Smith, JS

Source:PROCEEDINGS 2012 IEEE INTERNATIONAL CONFERENCE ON SYSTEMS, MAN, AND CYBERNETICS (SMC),2012,Vol.

Abstract:In this paper an object detection algorithm is proposed, which is robust in the presence of cast shadows and is based on geometric projections. The novelty of the work lies in the use of homology mapping of the foreground regions between different parallel planes within a monocular view, unlike some existing algorithms which depend on the use of multiple cameras. The results on an open video dataset are provided.

8.Operation of 8-wavelength-radius 2-layer lenses

Author:Gray, D;Nikolic, N;Thornton, J

Source:2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING,2015,Vol.2015-October

Abstract:Two competing 8-wavelength-radius 2-layer lens designs were identified in the literature. Both were analyzed by ray tracing and full wave simulation, as an initial step toward production by additive manufacturing for use at mm-wave frequencies. The conclusion of this initial study is that the relative permittivity 1.68 - 1.6 design appears to be best suited to production by laser sintering.

9.The effects of the bioanode on the microbial community and element profile in paddy soil

Author:Williamson, G;Chen, Z

Source:ENVIRONMENTAL ARSENIC IN A CHANGING WORLD (AS2018),2018,Vol.

Abstract:In paddy soil the reductive dissolution of iron oxide and the availability of organic matter plays an important role in arsenic release under anaerobic conditions. Microbial fuel cells have been shown to reduce organic matter (OM) content and the rate in which this occurs strongly relate to the external resistance applied. In this study we investigated the effects of bioanode operating at different external resistance on the paddy soil microbial community and iron and arsenic concentration. The results show that MFC can be used to reduce soil pore water iron and arsenic concentration and the extent in which this occurs depend on the external resistance applied. The MFC is able to mitigate arsenic release by decreasing organic matter availability. Furthermore, our finding shows that external resistance had a significant influence on the bacterial community composition that develop on the bioanode however only had minimal effect on the community of the bulk soil. These findings suggest that the sMFC can influence the iron and arsenic concentration by reducing OM content and the microbial community that develop in the bioanode vicinity.

10.Computation of macro-fiber composite integrated thin-walled smart structures

Author:Zhang, SQ;Zhang, SY;Chen, M;Bai, J;Li, J

Source:2016 GLOBAL CONFERENCE ON POLYMER AND COMPOSITE MATERIALS (PCM 2016),2016,Vol.137

Abstract:Due to high flexibility, reliability, and strong actuation forces, piezo fiber based composite smart material, macro-fiber composite (MFC), is increasingly applied in various fields for vibration suppression, shape control, and health monitoring. The complexity arrangement of MFC materials makes them difficult in numerical simulations. This paper develops a linear electro-mechanically coupled finite element (FE) model for composite laminated thin-walled smart structures bonded with MFC patches considering arbitrary piezo fiber orientation. Two types of MFCs are considered, namely, MFC-d31 in which the d(31) effect dominates the actuation forces, and MFC-d33 which mainly uses the d(33) effect. The proposed FE model is validated by static analysis of an MFC bonded smart plate.

11.Automatic Building and Floor Classification using Two Consecutive Multi-layer Perceptron

Author:Cha, J;Lee, S;Kim, KS

Source:2018 18TH INTERNATIONAL CONFERENCE ON CONTROL, AUTOMATION AND SYSTEMS (ICCAS),2018,Vol.2018-October

Abstract:Key issues of indoor localization is taking full advantages and overcoming its disadvantages. indoor localization based on Wi-Fi fingerprinting attracts researchers' attentions since it does not require new infrastructure and devices. Many devices such as smart phones and laptops, which have a function to capture Wi-Fi signals, can be used for Wi-Fi fingerprinting. However, due to unreliable Wi-Fi signals, there are still difficulty to achieve high positioning accuracy. The unreliable signal disturbs devices to find their locations. As a result, getting localization with devices sometimes makes a wrong decision in building classification. It is useless for people to find a destination floor if they are in different building. In this paper, we propose two consecutive multi-layer perceptrons to get more precise localization. With sumple structure, we get better performance and show precise decision results in building classification, which is critical in Wi-Fi fingerprinting. We use UJIndoorLoc dataset which is open dataset.

12.AlGaN/GaN Metal-Insulator-Semiconductor (MIS)-HFETs Based DC-DC Boost Converters with Integrated Gate Drivers

Author:Cui, M;Bu, QL;Cai, YT;Sun, RZ;Liu, W;Wen, HQ;Lam, S;Liang, YC;Mitrovic, IZ;Taylor, S;Chalker, PR;Zhao, CZ

Source:2019 10TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND ECCE ASIA (ICPE 2019 - ECCE ASIA),2019,Vol.

Abstract:This study proposed a 100 kHz, 5V/11V boost converter with an integrated gate driver for a power switching device using recessed E-mode MIS-HFETs. The integrated gate driver consisting of multi-stages DCFL (Direct-Coupled FET Logic) inverters and a buffer stage, has large input swing (up to 10 V) and wide noise margin with gate dielectric, which benefits applications requiring large gate swing without any additional drivers or level shifters. The impact of transistor size on rise times and fall times have been studied. Either buffer stage or larger width of DCFL inverter can reduce rise times from 2.4 mu s to less than 0.5 mu s at 100 kHz, so the output voltage of boost converter is increased by 10 %% at a duty cycle of 0.7. However, large buffer width can result in high gate overshoot and oscillation, indicating careful design to balance switching speed and oscillation.

13.2nd International Workshop on Multimedia Privacy and Security

Author:Hallman, RA;Li, SJ;Chang, V

Source:PROCEEDINGS OF THE 2018 ACM SIGSAC CONFERENCE ON COMPUTER AND COMMUNICATIONS SECURITY (CCS'18),2018,Vol.

14.When is analog? When is digital?

Author:Fischer, T

Source:KYBERNETES,2011,Vol.40

Abstract:Purpose - The purpose of this paper is to present a cybernetic way of seeing analog and digital along with a basic vocabulary for discussing assumptions underlying the use of both terms. Design/methodology/approach - Taking analog and digital not as properties of observed phenomena but as properties of observers, I ask not what is digital or analog, but what I do when I use these terms. I analyze introspectively, and report on, what I think my assumptions are when using the two terms. Findings - I develop a basic vocabulary to describe engagements that I describe as analog or digital. This vocabulary is applicable beyond technical contexts and suitable also for discussing social and creative processes. It includes a kind of observer who I call matchmaker. Research limitations/implications - The presented research is preliminary and subjective. Originality/value - While previous discussions consider analog and digital as properties of observed phenomena, they are considered here as properties of observers. The presented discussion is sufficiently abstract to account for the analog and the digital at various scales, including electronic signal processing and human interaction. The author argues that discussions of engagements described as analog or digital must account for observers of these engagements, including those who act as their matchmakers.

15.Modeling and Verification of NCL Circuits Using PAT

Author:Ma, JM;Man, KL;Lim, EG;Zhang, N;Lei, CU;Guan, SU;Jeong, TT;Seon, JK

Source:CEIS 2011,2011,Vol.15

Abstract:NULL Conventional Logic (NCL) is a Delay-Insensitive (DI) clockless paradigm and is suitable for implementing asynchronous circuits. Efficient methods of analysis are required to specify and verify such DI systems. Based on Delay Insensitive sequential Process (DISP) specification, this paper demonstrates the application of formal methods by applying Process Analysis Toolkit (PAT) to model and verify the behavior of NCL circuits. A few useful constructs are successfully modeled and verified by using PAT. The flexibility and simplicity of the coding, simulation and verification shows that PAT is effective and applicable for NCL circuit design and verification. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [CEIS 2011]

16.FMCW Rail-mounted SAR: porting spotlight SAR imaging from MATLAB to FPGA

Author:Melnikov, A;Le Kernec, J;Gray, D

Source:2014 IEEE INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING, COMMUNICATIONS AND COMPUTING (ICSPCC),2014,Vol.

Abstract:In this work, a low-cost laptop-based radar platform derived from the MIT open courseware has been implemented. It can perform ranging, Doppler measurement and SAR imaging using MATLAB as the processor. In this work, porting the signal processing algorithms onto a FPGA platform will be addressed as well as differences between results obtained using MAT LAB and those obtained using the FPGA platform. The target FPGA platforms were a Virtex6 DSP kit and Spartan3A starter kit, the latter was also low-cost to further reduce the cost for students to access radar technology.

17.Effects of Biased Irradiation on Charge Trapping in HfO2 Dielectric Thin Films

Author:Mu, YF;Zhao, CZ;Lu, QF;Zhao, C;Qi, YF;Lam, S;Mitrovic, IZ;Taylor, S;Chalker, PR

Source:4TH INTERNATIONAL CONFERENCE ON THE ADVANCEMENT OF MATERIALS AND NANOTECHNOLOGY (ICAMN IV 2016),2017,Vol.1877

Abstract:This paper reports the low-dose-rate radiation response of Al-HfO2/SiO2-Si MOS devices, in which the gate dielectric was formed by atomic layer deposition (ALD) with 5-nm equivalent oxide thickness. The degradation of the devices was characterized by a pulse capacitance-voltage (CV) and on-site radiation response technique under continuous gamma (gamma) ray exposure at a relatively low dose rate of 0.116 rad (HfO2)/s. Compared with conventional CV measurements, the proposed measurements extract significant variations of flat-band voltage shift of the hafnium based MOS devices. The large flat-band voltage shift is mainly attributed to the radiation-induced oxide trapped charges, which are not readily compensated by bias-induced charges produced over the measurement timescales (for timescales less than 5 ms). A negative flat-band voltage shift up to -1.02 V was observed under a positive biased irradiation with the total dose up to 40 krad (HfO2) and with the electric field of 0.5 MV/cm. This is attributed to net positive charge generation in the HfO2 oxide layer. The generated charges are transported towards the HfO2/SiO2 interface, and then form effective trapped holes in the HfO2. Similarly, a positive flat-band voltage shift up to 1.1 V was observed from irradiation under negative bias with an electric field of -0.5 MV/cm. The positive shift is mainly due to the accumulation of trapped electrons. Analyses of the experimental results suggest that both hole and electron trapping can dominate the radiation response performance of the HfO2-based MOS devices depending upon the applied bias. It was also found there was no distinct border traps with irradiation in all cases.

18.The Design of Bus Accessing Timing to NAND Flash Array for High Bandwidth

Author:Cheng, LX;Yang, Y;Liu, YY;Seon, JK;Man, KL

Source:2013 INTERNATIONAL SOC DESIGN CONFERENCE (ISOCC),2013,Vol.

Abstract:To improve the reading and writing speed of NAND flash array with multi-channel and multi-way, and to obtain the highest available bandwidth, an approach is presented in this paper. One mechanism of high efficiency bus accessing timing scheme based on interleaving is introduced into the approach. In pursuance of this timing, flash controllers are able to make every plane in the flash array to be active in parallel. Therefore the transmission ability to and from the bus can be greatly improved. Utilizing this approach, the accessing efficiency to the NAND flash array will be pushed to a very high level. According to the testing results, as opposed to normal flash bus timing scheme, the data reading efficiency can be increased by 68.5%%, and the data writing efficiency can be increased by 457%%, with the flash bus timing scheme presented in this paper being used. The conclusion can be drawn that the flash bus timing scheme presented in this paper is effective, and the reading and writing at very high speed to the NAND flash array can be realized.

19.IMPLEMENTATION OF HIGH PERFORMANCE MULTIPLIERS BASED ON APPROXIMATE COMPRESSOR DESIGN

Author:Ma, JM;Man, KL;Krilavicius, T;Guan, SU;Jeong, T

Source:ELECTRICAL AND CONTROL TECHNOLOGIES,2011,Vol.

Abstract:Estimating arithmetic is a design paradigm for DSP hardware. By allowing structurally incomplete arithmetic circuits to occasionally perform imprecise calculations, higher performance can be achieved in many different electronic systems. This paper presents a potential useful approach to implement tree multipliers by using estimating arithmetic. Experimental results show the applicability and effectiveness of the proposed approach.

20.Some criteria for a graph to be Class 1

Author:Akbari, S;Cariolaro, D;Chavooshi, M;Ghanbari, M;Zare, S

Source:DISCRETE MATHEMATICS,2012,Vol.312

Abstract:Let G be a graph. The core of G, denoted by G(Delta), is the subgraph of G induced by the vertices of degree Delta(G), where Delta(G) is the maximum degree of G. A k-edge coloring of a graph G is a function f : E(G) -> L, where vertical bar L vertical bar = k and f(e(1)) not equal f(e(2)), for every two adjacent edges e(1), e(2) of G. The edge chromatic number of G, denoted by chi'(G), is the minimum number k for which G has a k-edge coloring. A graph G is said to be Class 1 if chi'(G) = Delta(G) and Class 2 if chi'(G) = Delta(G) + 1. In this paper, it is shown that, for every connected graph of even order, if G(Delta) = C-6, then G is Class 1. Also, we prove that, if G is a connected graph, and every connected component of G(Delta) is a unicyclic graph or a tree, and G(Delta) is not a disjoint union of cycles, then G is Class 1. (C) 2011 Elsevier B.V. All rights reserved.
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