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Yeap</title> <meta name="description" content="Search results for: Tet Yeap"> <meta name="keywords" content="Tet Yeap"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler ml-auto" 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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="Tet Yeap"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 7</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: Tet Yeap</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7</span> Implementation of an Associative Memory Using a Restricted Hopfield Network</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tet%20H.%20Yeap">Tet H. Yeap</a> </p> <p class="card-text"><strong>Abstract:</strong></p> An analog restricted Hopfield Network is presented in this paper. It consists of two layers of nodes, visible and hidden nodes, connected by directional weighted paths forming a bipartite graph with no intralayer connection. An energy or Lyapunov function was derived to show that the proposed network will converge to stable states. By introducing hidden nodes, the proposed network can be trained to store patterns and has increased memory capacity. Training to be an associative memory, simulation results show that the associative memory performs better than a classical Hopfield network by being able to perform better memory recall when the input is noisy. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=restricted%20Hopfield%20network" title="restricted Hopfield network">restricted Hopfield network</a>, <a href="https://publications.waset.org/abstracts/search?q=Lyapunov%20function" title=" Lyapunov function"> Lyapunov function</a>, <a href="https://publications.waset.org/abstracts/search?q=simultaneous%20perturbation%20stochastic%20approximation" title=" simultaneous perturbation stochastic approximation"> simultaneous perturbation stochastic approximation</a> </p> <a href="https://publications.waset.org/abstracts/122365/implementation-of-an-associative-memory-using-a-restricted-hopfield-network" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/122365.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">133</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">6</span> Subspace Rotation Algorithm for Implementing Restricted Hopfield Network as an Auto-Associative Memory</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ci%20Lin">Ci Lin</a>, <a href="https://publications.waset.org/abstracts/search?q=Tet%20Yeap"> Tet Yeap</a>, <a href="https://publications.waset.org/abstracts/search?q=Iluju%20Kiringa"> Iluju Kiringa</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper introduces the subspace rotation algorithm (SRA) to train the Restricted Hopfield Network (RHN) as an auto-associative memory. Subspace rotation algorithm is a gradient-free subspace tracking approach based on the singular value decomposition (SVD). In comparison with Backpropagation Through Time (BPTT) on training RHN, it is observed that SRA could always converge to the optimal solution and BPTT could not achieve the same performance when the model becomes complex, and the number of patterns is large. The AUTS case study showed that the RHN model trained by SRA could achieve a better structure of attraction basin with larger radius(in general) than the Hopfield Network(HNN) model trained by Hebbian learning rule. Through learning 10000 patterns from MNIST dataset with RHN models with different number of hidden nodes, it is observed that an several components could be adjusted to achieve a balance between recovery accuracy and noise resistance. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=hopfield%20neural%20network" title="hopfield neural network">hopfield neural network</a>, <a href="https://publications.waset.org/abstracts/search?q=restricted%20hopfield%20network" title=" restricted hopfield network"> restricted hopfield network</a>, <a href="https://publications.waset.org/abstracts/search?q=subspace%20rotation%20algorithm" title=" subspace rotation algorithm"> subspace rotation algorithm</a>, <a href="https://publications.waset.org/abstracts/search?q=hebbian%20learning%20rule" title=" hebbian learning rule"> hebbian learning rule</a> </p> <a href="https://publications.waset.org/abstracts/148410/subspace-rotation-algorithm-for-implementing-restricted-hopfield-network-as-an-auto-associative-memory" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/148410.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">117</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5</span> Perspectives and Outcomes of a Long and Shorter Community Mental Health Program</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Danielle%20Klassen">Danielle Klassen</a>, <a href="https://publications.waset.org/abstracts/search?q=Reiko%20Yeap"> Reiko Yeap</a>, <a href="https://publications.waset.org/abstracts/search?q=Margo%20Schmitt-Boshnick"> Margo Schmitt-Boshnick</a>, <a href="https://publications.waset.org/abstracts/search?q=Scott%20Oddie"> Scott Oddie</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The development of the 7-week Alberta Happiness Basics program was initiated in 2010 in response to the need for community mental health programming. This provincial wide program aims to increase overall happiness and reduce negative thoughts and feelings through a positive psychology intervention. While the 7-week program has proven effective, a shortened 4-week program has additionally been developed to address client needs. In this study, participants were interviewed to determine if the 4- and 7-week programs had similar success of producing lasting behavior change at 3, 6, and 9 months post-program. A health quality of life (HQOL) measure was also used to compare the two programs and examine patient outcomes. Quantitative and qualitative analysis showed significant improvements in HQOL and sustainable behavior change for both programs. Findings indicate that the shorter, patient-centered program was effective in increasing happiness and reducing negative thoughts and feelings. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=primary%20care" title="primary care">primary care</a>, <a href="https://publications.waset.org/abstracts/search?q=mental%20health" title=" mental health"> mental health</a>, <a href="https://publications.waset.org/abstracts/search?q=depression" title=" depression"> depression</a>, <a href="https://publications.waset.org/abstracts/search?q=short%20duration" title=" short duration"> short duration</a> </p> <a href="https://publications.waset.org/abstracts/74831/perspectives-and-outcomes-of-a-long-and-shorter-community-mental-health-program" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/74831.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">270</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">4</span> Effect of Rice Husk Ash on Strength and Durability of High Strength High Performance Concrete</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=H.%20B.%20Mahmud">H. B. Mahmud</a>, <a href="https://publications.waset.org/abstracts/search?q=Syamsul%20Bahri"> Syamsul Bahri</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20W.%20Yee"> Y. W. Yee</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20T.%20Yeap"> Y. T. Yeap </a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper reports the strength and durability properties of high strength high performance concrete incorporating rice husk ash (RHA) having high silica, low carbon content and appropriate fineness. In this study concrete containing 10%, 15% and 20% RHA as cement replacement and water to binder ratio of 0.25 were investigated. The results show that increasing amount of RHA increases the dosage of superplasticizer to maintain similar workability. Partial replacement of cement with RHA did not increase the early age compressive strength of concrete. However, concrete containing RHA showed higher compressive strength at later ages. The results showed that compressive strength of concrete in the 90-115 MPa range can be obtained at 28 curing days and the durability properties of RHA concrete performed better than that of control concrete. The water absorption of concrete incorporating 15% RHA exhibited the lowest value. The porosity of concrete is consistent with water absorption whereby higher replacement of RHA decreased the porosity of concrete. There is a positive correlation between reducing porosity and increasing compressive strength of high strength high performance concrete. The results also indicate that up to 20% of RHA incorporation could be advantageously blended with cement without adversely affecting the strength and durability properties of concrete. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=compressive%20strength" title="compressive strength">compressive strength</a>, <a href="https://publications.waset.org/abstracts/search?q=durability" title=" durability"> durability</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20performance%20concrete" title=" high performance concrete"> high performance concrete</a>, <a href="https://publications.waset.org/abstracts/search?q=rice%20husk%20ash" title=" rice husk ash"> rice husk ash</a> </p> <a href="https://publications.waset.org/abstracts/47128/effect-of-rice-husk-ash-on-strength-and-durability-of-high-strength-high-performance-concrete" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/47128.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">345</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">3</span> Performance of BLDC Motor under Kalman Filter Sensorless Drive</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yuri%20Boiko">Yuri Boiko</a>, <a href="https://publications.waset.org/abstracts/search?q=Ci%20Lin"> Ci Lin</a>, <a href="https://publications.waset.org/abstracts/search?q=Iluju%20Kiringa"> Iluju Kiringa</a>, <a href="https://publications.waset.org/abstracts/search?q=Tet%20Yeap"> Tet Yeap</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The performance of a BLDC motor controlled by the Kalman filter-based position-sensorless drive is studied in terms of its dependence on the system’s parameters' variations. The effects of system’s parameters changes on the dynamic behavior of state variables are verified. Simulated is a closed-loop control scheme with a Kalman filter in the feedback line. Distinguished are two separate data sampling modes in analyzing feedback output from the BLDC motor: (1) equal angular separation and (2) equal time intervals. In case (1), the data are collected via equal intervals Δθ of rotor’s angular position θᵢ, i.e., keeping Δθ=const. In case (2), the data collection time points tᵢ are separated by equal sampling time intervals Δt=const. Demonstrated are the effects of the parameters changes on the sensorless control flow, in particular, reduction of the torque ripples, switching spikes, torque load balancing. It is specifically shown that an efficient suppression of commutation induced torque ripples is achievable selection of the sampling rate in the Kalman filter settings above certain critical value. The computational cost of such suppression is shown to be higher for the motors with lower induction values of the windings. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=BLDC%20motor" title="BLDC motor">BLDC motor</a>, <a href="https://publications.waset.org/abstracts/search?q=Kalman%20filter" title=" Kalman filter"> Kalman filter</a>, <a href="https://publications.waset.org/abstracts/search?q=sensorless%20drive" title=" sensorless drive"> sensorless drive</a>, <a href="https://publications.waset.org/abstracts/search?q=state%20variables" title=" state variables"> state variables</a>, <a href="https://publications.waset.org/abstracts/search?q=torque%20ripples%20reduction" title=" torque ripples reduction"> torque ripples reduction</a>, <a href="https://publications.waset.org/abstracts/search?q=sampling%20rate" title=" sampling rate"> sampling rate</a> </p> <a href="https://publications.waset.org/abstracts/128662/performance-of-bldc-motor-under-kalman-filter-sensorless-drive" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/128662.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">148</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2</span> Induced Pulsation Attack Against Kalman Filter Driven Brushless DC Motor Control System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yuri%20Boiko">Yuri Boiko</a>, <a href="https://publications.waset.org/abstracts/search?q=Iluju%20Kiringa"> Iluju Kiringa</a>, <a href="https://publications.waset.org/abstracts/search?q=Tet%20Yeap"> Tet Yeap</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We use modeling and simulation tools, to introduce a novel bias injection attack, named the ’Induced Pulsation Attack’, which targets Cyber Physical Systems with closed-loop controlled Brushless DC (BLDC) motor and Kalman filter driver in the feedback loop. This attack involves engaging a linear function with a constant gradient to distort the coefficient of the injected bias, which falsifies the Kalman filter estimates of the rotor’s angular speed. As a result, this manipulation interaction inside the control system causes periodic pulsations in a form of asymmetric sine wave of both current and voltage in the circuit windings, with a high magnitude. It is shown that by varying the gradient of linear function, one can control both the frequency and structure of the induced pulsations. It is also demonstrated that terminating the attack at any point leads to additional compensating effort from the controller to restore the speed to its equilibrium value. This compensation effort produces an exponentially decaying wave, which we call the ’attack withdrawal syndrome’ wave. The conditions for maximizing or minimizing the impact of the attack withdrawal syndrome are determined. Linking the termination of the attack to the end of the full period of the induced pulsation wave has been shown to nullify the attack withdrawal syndrome wave, thereby improving the attack’s covertness. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cyber-attack" title="cyber-attack">cyber-attack</a>, <a href="https://publications.waset.org/abstracts/search?q=induced%20pulsation" title=" induced pulsation"> induced pulsation</a>, <a href="https://publications.waset.org/abstracts/search?q=bias%20injection" title=" bias injection"> bias injection</a>, <a href="https://publications.waset.org/abstracts/search?q=Kalman%20filter" title=" Kalman filter"> Kalman filter</a>, <a href="https://publications.waset.org/abstracts/search?q=BLDC%20motor" title=" BLDC motor"> BLDC motor</a>, <a href="https://publications.waset.org/abstracts/search?q=control%20system" title=" control system"> control system</a>, <a href="https://publications.waset.org/abstracts/search?q=closed%20loop" title=" closed loop"> closed loop</a>, <a href="https://publications.waset.org/abstracts/search?q=P-%20controller" title=" P- controller"> P- controller</a>, <a href="https://publications.waset.org/abstracts/search?q=PID-controller" title=" PID-controller"> PID-controller</a>, <a href="https://publications.waset.org/abstracts/search?q=saw-function" title=" saw-function"> saw-function</a>, <a href="https://publications.waset.org/abstracts/search?q=cyber-physical%20system" title=" cyber-physical system"> cyber-physical system</a> </p> <a href="https://publications.waset.org/abstracts/164883/induced-pulsation-attack-against-kalman-filter-driven-brushless-dc-motor-control-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/164883.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">71</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1</span> Current Drainage Attack Correction via Adjusting the Attacking Saw-Function Asymmetry</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yuri%20Boiko">Yuri Boiko</a>, <a href="https://publications.waset.org/abstracts/search?q=Iluju%20Kiringa"> Iluju Kiringa</a>, <a href="https://publications.waset.org/abstracts/search?q=Tet%20Yeap"> Tet Yeap</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Current drainage attack suggested previously is further studied in regular settings of closed-loop controlled Brushless DC (BLDC) motor with Kalman filter in the feedback loop. Modeling and simulation experiments are conducted in a Matlab environment, implementing the closed-loop control model of BLDC motor operation in position sensorless mode under Kalman filter drive. The current increase in the motor windings is caused by the controller (p-controller in our case) affected by false data injection of substitution of the angular velocity estimates with distorted values. Operation of multiplication to distortion coefficient, values of which are taken from the distortion function synchronized in its periodicity with the rotor’s position change. A saw function with a triangular tooth shape is studied herewith for the purpose of carrying out the bias injection with current drainage consequences. The specific focus here is on how the asymmetry of the tooth in the saw function affects the flow of current drainage. The purpose is two-fold: (i) to produce and collect the signature of an asymmetric saw in the attack for further pattern recognition process, and (ii) to determine conditions of improving stealthiness of such attack via regulating asymmetry in saw function used. It is found that modification of the symmetry in the saw tooth affects the periodicity of current drainage modulation. Specifically, the modulation frequency of the drained current for a fully asymmetric tooth shape coincides with the saw function modulation frequency itself. Increasing the symmetry parameter for the triangle tooth shape leads to an increase in the modulation frequency for the drained current. Moreover, such frequency reaches the switching frequency of the motor windings for fully symmetric triangular shapes, thus becoming undetectable and improving the stealthiness of the attack. Therefore, the collected signatures of the attack can serve for attack parameter identification via the pattern recognition route. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bias%20injection%20attack" title="bias injection attack">bias injection attack</a>, <a href="https://publications.waset.org/abstracts/search?q=Kalman%20filter" title=" Kalman filter"> Kalman filter</a>, <a href="https://publications.waset.org/abstracts/search?q=BLDC%20motor" title=" BLDC motor"> BLDC motor</a>, <a href="https://publications.waset.org/abstracts/search?q=control%20system" title=" control system"> control system</a>, <a href="https://publications.waset.org/abstracts/search?q=closed%20loop" title=" closed loop"> closed loop</a>, <a href="https://publications.waset.org/abstracts/search?q=P-controller" title=" P-controller"> P-controller</a>, <a href="https://publications.waset.org/abstracts/search?q=PID-controller" title=" PID-controller"> PID-controller</a>, <a href="https://publications.waset.org/abstracts/search?q=current%20drainage" title=" current drainage"> current drainage</a>, <a href="https://publications.waset.org/abstracts/search?q=saw-function" title=" saw-function"> saw-function</a>, <a href="https://publications.waset.org/abstracts/search?q=asymmetry" title=" asymmetry"> asymmetry</a> </p> <a href="https://publications.waset.org/abstracts/161313/current-drainage-attack-correction-via-adjusting-the-attacking-saw-function-asymmetry" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/161313.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">80</span> </span> </div> </div> </div> </main> <footer> <div id="infolinks" class="pt-3 pb-2"> <div class="container"> <div style="background-color:#f5f5f5;" class="p-3"> <div class="row"> <div class="col-md-2"> <ul 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