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Articles 23131 - 23160 of 27393

Full-Text Articles in Engineering

Stray Magnetic Field Distributed Around A Pmsm, Ali̇ Ahmed Adam, Kayhan Gülez, Seli̇m Köroğlu Jan 2011

Stray Magnetic Field Distributed Around A Pmsm, Ali̇ Ahmed Adam, Kayhan Gülez, Seli̇m Köroğlu

Turkish Journal of Electrical Engineering and Computer Sciences

In this work, the low frequency electromagnetic emission from permanent magnet synchronous motors is studied. The main objective is to provide a safety region for humans in the vicinity of these motors, especially as these motors are now being used widely in inhabited areas, where high flux densities are expected. In this study, a new proposed equivalent magnetic circuit is used to estimate the stray fields at the surface of the motor. The analysis showed that the emission of the stray field in the radial direction depends on the permeability of the stator body. Low values of permeability may result …

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New Srco With Explicit Current-Mode Output Using Two Ccs And Grounded Capacitors, D R. Bhaskar, Kasim K. Abdalla, Raj Senani Jan 2011

New Srco With Explicit Current-Mode Output Using Two Ccs And Grounded Capacitors, D R. Bhaskar, Kasim K. Abdalla, Raj Senani

Turkish Journal of Electrical Engineering and Computer Sciences

A new Grounded-Capacitor Single Resistance Controlled Sinusoidal Oscillator (SRCO) with explicit current output using two Current Conveyors (CCs) and five passive elements is presented. The proposed circuit offers (i) independent control of condition of oscillation and frequency of oscillation, (ii) low active and passive sensitivities, (iii) use of both the grounded capacitors (suitable for IC implementation) and (iv) reasonably good frequency stability. The workability of the proposed configuration has been confirmed by the PSPICE simulations.

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Imitation Of Basic Hand Preshapes By Fluid Based Method: Fluidics Formation Control, Umut Ti̇lki̇, İsmet Erkmen, Aydan Müşerref Erkmen Jan 2011

Imitation Of Basic Hand Preshapes By Fluid Based Method: Fluidics Formation Control, Umut Ti̇lki̇, İsmet Erkmen, Aydan Müşerref Erkmen

Turkish Journal of Electrical Engineering and Computer Sciences

In this paper, a new approach is developed, avoiding the correspondence problem caused by the difference in embodiment between imitator and demonstrator in imitation learning. In our work, the imitator is a fluidic system of dynamics totally different than the imitatee, which is a human performing hand gestures. The fluidic system is composed of fluid particles, which are used for the discretization of the problem domain. In this work, we demonstrate the fluidics formation control so as to imitate by observation basic hand preshaping features. Our fluidic formation control is based on setting suitable parameters of Smoothed Particle Hydrodynamics (SPH), …

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Four Quadrant Fgmos Analog Multiplier, Si̇nem Keleş, Hulusi̇ Hakan Kuntman Jan 2011

Four Quadrant Fgmos Analog Multiplier, Si̇nem Keleş, Hulusi̇ Hakan Kuntman

Turkish Journal of Electrical Engineering and Computer Sciences

A novel four-quadrant analog multiplier using floating gate MOS (FGMOS) transistors operating in the saturation region is presented. The drain current is proportional to the square of the weighted sum of the input signals. This square law characteristic of the FGMOS transistor is used to implement the quarter square identity by utilizing only six FGMOS transistors. The main features of this remarkably simple multiplier circuit configuration are the large input signal range equal to 100% of the supply voltage, nonlinearity of 0.0081%, bandwidth of 1.4--1.5 Ghz and THD of maximum 2.67% (while the inputs are at their maximum values).

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Statistical Analysis When The Data Is An Image: Eliciting Student Thinking About Sampling And Variability, Tamara J. Moore, Margret Hjalmarson, Robert Delmas Jan 2011

Statistical Analysis When The Data Is An Image: Eliciting Student Thinking About Sampling And Variability, Tamara J. Moore, Margret Hjalmarson, Robert Delmas

School of Engineering Education Faculty Publications

Within statistics education, there is a growing interest in understanding students' application of understanding about variability and sampling given the relative lack of research in either area (Shaughnessy, 2007). The task examined in this paper elicited students' knowledge of these concepts within a small-group problem solving task completed by teams of first-year engineering students. In the Nanoroughness task, teams of students designed a procedure for quantifying the roughness of a material surface using digital images generated by atomic force microscopy. The procedure required students to apply statistical methods in order to aggregate the data. The focus of this article is …

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Table Of Contents Jan 2011

Table Of Contents

Journal of Digital Forensics, Security and Law

No abstract provided.

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A Survey Of Contemporary Enterprise Storage Technologies From A Digital Forensics Perspective, Gregory H. Carlton, Joseph Matsumoto Jan 2011

A Survey Of Contemporary Enterprise Storage Technologies From A Digital Forensics Perspective, Gregory H. Carlton, Joseph Matsumoto

Journal of Digital Forensics, Security and Law

As the proliferation of digital computational systems continue to expand, increasingly complex technologies emerge, including those regarding large, enterprise-wide, information storage and retrieval systems. Within this study, we examine four contemporary enterprise storage technologies. Our examination of these technologies is presented with an overview of the technological features of each offering and then followed with a discussion of the impact of these technologies on digital forensics methods, particularly regarding forensic data acquisition. We offer a general opinion concerning a recommended data acquisition method when faced with the task of obtaining a forensic image of data contained within these technologies, we …

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Legal Issues Regarding Digital Forensic Examiners Third Party Consent To Search, Thomas Lonardo, Doug White, Tricia P. Martland, Alan Rea Jan 2011

Legal Issues Regarding Digital Forensic Examiners Third Party Consent To Search, Thomas Lonardo, Doug White, Tricia P. Martland, Alan Rea

Journal of Digital Forensics, Security and Law

This paper focuses on Federal law as it relates to consent to search relating to Fourth Amendment privacy in the practice of Digital Forensics. In particular, Digital Examiners should be aware of how decisions in Federal Court may impact their ability to acquire evidence in both civil and criminal settings. Digital Forensics, being a relatively new field, is particularly subject to change as cases and appeals are decided. This paper provides an overview of relevant case law relating to issues in Digital Forensics. More importantly, our research provides Digital Forensic Examiners (DFE), as defined by Lonardo, White, and Rea (2008, …

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Exploring The Iphone Backup Made By Itunes, Mario Piccinelli, Paolo Gubian Jan 2011

Exploring The Iphone Backup Made By Itunes, Mario Piccinelli, Paolo Gubian

Journal of Digital Forensics, Security and Law

Apple’s™ iPhone™ is one of the widest selling mobile on the market, thanks to its simple and user-friendly interface and ever growing pool of available high quality applications for both personal and business use. The increasing use of the iPhone leads forensics practitioners towards the need for tools to access and analyze the information stored in the device. This research aims at describing the process to forensically analyze a logical backup of an iPhone made by the Apple iTunes™ utility, understanding the backup’s structure, and creating a simple tool to automate the process of decoding and analyzing the data. In …

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A Case Study In Forensic Analysis Of Control, Fred Cohen Jan 2011

A Case Study In Forensic Analysis Of Control, Fred Cohen

Journal of Digital Forensics, Security and Law

This paper describes a case study in which a method for forensic analysis of control was applied to resolve probative technical issues in a legal action. It describes one instance in which the analysis was successfully applied without challenge, addresses the details of most of the different facets of the analysis method, and demonstrates how such analysis provides a systematic approach to using technical methods to address legal issues as a case study.

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Extraction Of Electronic Evidence From Voip: Forensic Analysis Of A Virtual Hard Disk Vs Ram, David Irwin, Jill Slay, Arek Dadej, Malcolm Shore Jan 2011

Extraction Of Electronic Evidence From Voip: Forensic Analysis Of A Virtual Hard Disk Vs Ram, David Irwin, Jill Slay, Arek Dadej, Malcolm Shore

Journal of Digital Forensics, Security and Law

The popularity of Voice over the Internet Protocol (VoIP) is increasing as the cost savings and ease of use is realised by a wide range of home and corporate users. However, the technology is also attractive to criminals. This is because VoIP is a global telephony service, in which it is difficult to verify the user’s identification. The security of placing such calls may also be appealing to criminals, as many implementations use strong encryption to secure both the voice payload as well as to control messages making monitoring such VoIP calls difficult since conventional methods such as wire-tapping is …

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Table Of Contents Jan 2011

Table Of Contents

Journal of Digital Forensics, Security and Law

No abstract provided.

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Book Review: Ios Forensic Analysis: For Iphone, Ipad And Ipod Touch, Christopher Schulte Jan 2011

Book Review: Ios Forensic Analysis: For Iphone, Ipad And Ipod Touch, Christopher Schulte

Journal of Digital Forensics, Security and Law

As Digital Forensics practitioners, we know that our discipline is constantly evolving. Keeping abreast means we need to continually refine and broaden our knowledge pools through experience, education, research, peer exchange, and more. Mobile device forensics can be especially dynamic and challenging. With multiple standards in place at the hardware, operating system, and user interface levels, it can be daunting to preserve, analyze, search and report on these tiny yet ubiquitous hand-held computers. Apple Computer’s line of mobile products (iOS devices - iPhone, iPad, iPod Touch) is no exception to this rule.

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Column: Every Last Byte, Simson Garfinkel Jan 2011

Column: Every Last Byte, Simson Garfinkel

Journal of Digital Forensics, Security and Law

Inheritance powder is the name that was given to poisons, especially arsenic, that were commonly used in the 17th and early 18th centuries to hasten the death of the elderly. For most of the 17th century, arsenic was deadly but undetectable, making it nearly impossible to prove that someone had been poisoned. The first arsenic test produced a gas—hardly something that a scientist could show to a judge. Faced with a growing epidemic of poisonings, doctors and chemists spent decades searching for something better

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Technology Corner: Brute Force Password Generation -- Basic Iterative And Recursive Algorithms, Nick V. Flor, Haile Shannon Jan 2011

Technology Corner: Brute Force Password Generation -- Basic Iterative And Recursive Algorithms, Nick V. Flor, Haile Shannon

Journal of Digital Forensics, Security and Law

Most information systems are secured at minimum by some form of password protection. For various reasons a password may be unavailable, requiring some form of password recovery procedure. One such procedure is software-based automated password recovery, where a program attempts to log into a system by repeatedly trying different password combinations. At the core of such software is a password generator. This article describes the basic iterative and recursive algorithms for generating all possible passwords of a given length, which is commonly referred to as brute-force password generation. The paper ends with a discussion of alternative password recovery procedures one …

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Illicit Trafficking Of Radioactive Sources: Experiences With Fake Materials In Tanzania, Iddi Mkilaha Dec 2010

Illicit Trafficking Of Radioactive Sources: Experiences With Fake Materials In Tanzania, Iddi Mkilaha

Tanzania Journal of Engineering and Technology (TJET)

Radioactive materials although are very useful, they are one of the catastrophic sources of mass destruction if misused. These materials have a number of positive uses which makes them very essential in our modern society. Incidences such as the bombings of the US Embassies in East Africa, the September 11, and many others had formed a basis for international responsive actions to control illicit trafficking of Radioactive and Nuclear Materials. The aim of this work is to track the movements and subsequently uses of these materials. Tanzania is one of the countries where International Nuclear Safeguards protocols are fully operational …

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Flotation Circuit Performance Determination Using Size By Size Recovery – Case Of Bulyanhulu Gold Mine, Savinus Maronga Dec 2010

Flotation Circuit Performance Determination Using Size By Size Recovery – Case Of Bulyanhulu Gold Mine, Savinus Maronga

Tanzania Journal of Engineering and Technology (TJET)

The Bulyanhulu rougher flotation circuit performance has been determined by establishing the performance of individual cells. Direct sampling was done on all the rougher cell input, output and size analysis was performed on the samples with material in each size fraction assayed for copper and gold to determine their recoveries. It was observed that the performance of rougher cell number 3 and 4 was poor compared to other cells especially for finer particles below 53 µm where the recoveries were below 60%. In the last two flotation cells recoveries of both metals was very good (above 90%) in all particle …

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Universal Design Of Transportation Systems: A Case Study Of Access And Mobility Of People With Disabilities At Selected Intersections In Dar Es Salaam, Nurdin Mushule Dec 2010

Universal Design Of Transportation Systems: A Case Study Of Access And Mobility Of People With Disabilities At Selected Intersections In Dar Es Salaam, Nurdin Mushule

Tanzania Journal of Engineering and Technology (TJET)

The pedestrian facilities at intersections must be usable by pedestrians of all ages and capabilities. Intersections in particular must be designed to safely accommodate pedestrians of all ages and physical and mental abilities. Often, however, intersection designs fail to accommodate people with visual and mobility disabilities. In this regard, for pedestrians with disabilities, intersections can prove to be a challenge. Some of those challenges include provision of insufficient pedestrian clearance time due to use of inappropriate design pedestrian speed. Most importantly, the required facilities to enable People With Disabilities (PWD) to use the intersection without hindrance may be missing. Obstacles …

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Analysis Of Factors Affecting Technological Innovativeness In Engineering Enterprises In Tanzania, Emanuel Mjema Dec 2010

Analysis Of Factors Affecting Technological Innovativeness In Engineering Enterprises In Tanzania, Emanuel Mjema

Tanzania Journal of Engineering and Technology (TJET)

This paper discusses the technological innovativeness in engineering enterprises in Tanzania and analyses the factors affecting the innovativeness. It starts by analyzing various concepts regarding innovation, then analyzed from documentary review factors affecting innovativeness and then analyzed the innovativeness in Tanzanian enterprises. From the documentary review it was learnt that the following key factors influence technological innovativeness: Existence of innovation management; Existence of market to absorb the products of innovation; Existence of partnership between the universities and the firms; Existence of positive culture and politics towards innovation; The government playing its role to influence innovation; Existence of the right knowledge; …

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A Time-Domain Analysis Of Wave Force On Small-Scale Cylinders Of Offshore Structures, Bao-Lei Geng, Bin Teng, De-Zhi Ning Dec 2010

A Time-Domain Analysis Of Wave Force On Small-Scale Cylinders Of Offshore Structures, Bao-Lei Geng, Bin Teng, De-Zhi Ning

Journal of Marine Science and Technology–Taiwan

To get the accurate wave loads on the small-scale cylinders on the platforms, not only the incident wave but also the diffraction and radiation wave should be considered. By taking the wave diffraction from a fixed large-scale cylinder as an example, wave loads on small-diameter cylinders in the diffraction wave field are calculated by Morison formula in this paper. A time-domain numerical model on wave diffraction from large-scale structures is developed with a higher-order boundary element method (HOBEM). Then the velocity and acceleration of any water particle in the fluid domain can be produced from the solved diffraction potential. Results …

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Improving The Emulsion Stability Of Sponge Cake By The Addition Of ?-Polyglutamic Acid, Yung-Shin Shyu, Wen-Chieh Sung Dec 2010

Improving The Emulsion Stability Of Sponge Cake By The Addition Of ?-Polyglutamic Acid, Yung-Shin Shyu, Wen-Chieh Sung

Journal of Marine Science and Technology–Taiwan

The batter properties of sponge cake with the addition of γ-polyglutamic acid (PGA) at different levels (0.05, 0.1, 0.5 gkg-1, w/w) was evaluated. The viscosity, emulsion stability and foam stability increased at the addition of 0.5 gkg-1 PGA level. PGA caused significant declines in the differential scanning calorimetry (DSC) enthalpy, onset and peak temperatures of ice-melting transition of sponge cake. Sponge cakes manufactured with 0.5 gkg-1 PGA addition were in general lighter on crumb color and white index than the control. Scanning electron microscopy showed that sponge cake with the addition of 0.1 and 0.5 gkg-1 PGA exhibited microstructures having …

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Sidescan Sonar Image Processing:Correcting Brightness Variation And Patching Gaps, Yet-Chung Chang, Shu-Kun Hsu, Ching-Hui Tsai Dec 2010

Sidescan Sonar Image Processing:Correcting Brightness Variation And Patching Gaps, Yet-Chung Chang, Shu-Kun Hsu, Ching-Hui Tsai

Journal of Marine Science and Technology–Taiwan

Sidescan sonar data are typically presented as gray level images. However, sidescan images often show striking variations in brightness. These variations, caused by the sonar beam pattern and the constantly changing attitude of the towfish, make the images difficult to read as pictures of the seabed. This reduces the utility of the images for marine geologists. In this paper, the effects of the sonar beam pattern across the swath are corrected using a normalization process based on the average signal intensity for each grazing angle. Noise along the track, which is generally caused by changes in the attitude of the …

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The Sensitivity Analysis Of A Mems Microphone With Different Membrane Diameters, Cheng-Ta Yang Dec 2010

The Sensitivity Analysis Of A Mems Microphone With Different Membrane Diameters, Cheng-Ta Yang

Journal of Marine Science and Technology–Taiwan

In MEMS capacitive microphone design, it is very critical to get highest yielding rate and sensitivity as the two major factors dominate structure design of microphone. The centralpost MEMS microphone is introduced in this paper to differentiate from traditional fixed membrane boundary microphone since the construction is simple and only few masks are required in the process so that the yielding can be greatly enhanced. Thus, it is necessary to find the relationship between the sensitivity and dimension of the diameter of the membrane. The main research steps described in this paper include using CoventorWarer to develop one analysis model …

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The Application Of E-Technology For Marine Information Service, Lien-Kwei Chien, Tsung-Shen Feng, Chieh-Cheng Yen, Beng-Chun Lee, Heng-Wen Chang Dec 2010

The Application Of E-Technology For Marine Information Service, Lien-Kwei Chien, Tsung-Shen Feng, Chieh-Cheng Yen, Beng-Chun Lee, Heng-Wen Chang

Journal of Marine Science and Technology–Taiwan

The purpose of this study is to establish the multi-function querying system by applying e-technology in marine data. Subjects tendency technology is new concept in system designing process of this study which originate from simulation language that was replace the structural technology. We also investigate the statistical characteristics of ocean waves and surges over Taiwan waters by cluster and return period analysis. Marine drifter track analysis and search area determination system were also analysis and import to GIS querying system. In order to make the locations of the near shore ships and sailing data could be easily convey through wireless …

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Stability Assessment For The Undersea Gas Pipeline, Wen-Chien Tseng, Lien-Kwei Chien, Sheng-Tse Chuang, Pei-Chi Tsai, Ya-Ting Hsu, Ting-Ting Lu, Chu-Kuan Lin Dec 2010

Stability Assessment For The Undersea Gas Pipeline, Wen-Chien Tseng, Lien-Kwei Chien, Sheng-Tse Chuang, Pei-Chi Tsai, Ya-Ting Hsu, Ting-Ting Lu, Chu-Kuan Lin

Journal of Marine Science and Technology–Taiwan

In general, the activities of harbour district, coastal construction and re-transportation of tide and current are all possible to influence the stability of research area and sediment environment in nearshore area. It indicates that status of deposit property of seabed and variability of sediment environment are important factors to stability and safety for the path of undersea gas pipeline. An assessment procedure and approach for the prediction of the wave-induced and earthquake-induced liquefaction potential and erosion potential are proposed for marine engineering practice. The soil sample of this study is obtained from deposit zone of gas pipeline of seabed in …

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A New Calibration Method For Low Cost Mems Inertial Sensor Module, Sheng-Chih Shen, Chia-Jung Chen, Hsin-Jung Huang Dec 2010

A New Calibration Method For Low Cost Mems Inertial Sensor Module, Sheng-Chih Shen, Chia-Jung Chen, Hsin-Jung Huang

Journal of Marine Science and Technology–Taiwan

This paper presents a new calibration method to overcome the challenges of MEMS inertial sensors for underwater navigation. The MEMS inertial sensor module is composed of an accelerometer, a gyroscope and a circuit of signal process. For navigation estimation, it is easy to be influenced by errors which come from MEMS inertial sensors. In general, the sources of error can be categorized into two groups, deterministic type and stochastic type. The former primarily includes bias errors, misalignment and nonlinearity; the latter contains temperature effect and signal drifting. Subsequently, the linearity calibration is used to modify the deterministic error and the …

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The Performance Of Indium Tin Oxide Films Deposited On Plastic Substrate Applied For Solar-Cell Buoy, Chien-Kun Wang, Jyh-Jier Ho, Sung-Jen Nien, Yuang-Tung Cheng, William Lee, Chih-Chiang Lu, Bao-Shun Yau, Hsing-Wang Tsai, Chung-Cheng Chang Dec 2010

The Performance Of Indium Tin Oxide Films Deposited On Plastic Substrate Applied For Solar-Cell Buoy, Chien-Kun Wang, Jyh-Jier Ho, Sung-Jen Nien, Yuang-Tung Cheng, William Lee, Chih-Chiang Lu, Bao-Shun Yau, Hsing-Wang Tsai, Chung-Cheng Chang

Journal of Marine Science and Technology–Taiwan

In this paper, we report the indium tin oxide (ITO) films deposited on the polyethyene terephthalate (PET) substrate, which surface is treated with detergent solution. The ITO films are deposited on room temperature by direct current (DC) magnetron sputtering from a ceramic target of a 90% In-10% Sn alloy. The deposited opto-electric ITO films on PET with detergent treatment are 83.4% average visible transparency, and 5.8 × 10-4 Ω-cm resistivity, respectively. And then, we use the spin coating to form the polymer solar cell. Under optimal conditions of surface treatment and film deposition, the experimental result shows 2.12% of the …

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Signal Subspace Transformation For Direction-Of-Arrival Estimation Of Wideband Sources In Near Field, Lena Chang Dec 2010

Signal Subspace Transformation For Direction-Of-Arrival Estimation Of Wideband Sources In Near Field, Lena Chang

Journal of Marine Science and Technology–Taiwan

A novel adaptive signal subspace transformation for direction-of-arrival (DOA) estimation of wideband sources in the near-field is proposed in this paper. The method is composed of two transformations: signal subspace focusing (SSF) and far-field transformation (FFT). SSF aligns the signal subspaces for different frequencies in the bandwidth of the sources based on focusing matrices. FFT transforms the near-field steering vector to be the far-field steering vector with same direction-of-arrival (DOA) allocation. By the way, we simplify the location estimation of wideband sources in the near-field to be narrowband sources in the far field. The proposed method can track the DOAs …

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Determining The Cyclic Strength Of Geomaterials Under Low Frequency Cyclic Loading With Acoustic Emission, Helsin Wang, Ta-Peng Chang, Ju-Jiang Hung Dec 2010

Determining The Cyclic Strength Of Geomaterials Under Low Frequency Cyclic Loading With Acoustic Emission, Helsin Wang, Ta-Peng Chang, Ju-Jiang Hung

Journal of Marine Science and Technology–Taiwan

Acoustic emission is traditionally regarded as an explicit measurable index for microcracking in geomaterials. An accelerative cracking point is first introduced based on the different characteristics of acoustic emission at stable fracture propagation stage. Accelerative cracking point is located between the fracture initiation strength and critical energy release point, a point causing a fatal uncontrolled fracture in materials. Microcracking dominates the real mechanical characteristics in the materials, not reflected on the conventional mechanical experimental results as the stress level beyond the accelerative cracking point at the stable fracture propagation stage. At this stage, non-stress-controlled fracture in materials could arise as …

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Response Analysis Of Concrete Piles Subjected To Lateral Impact, Helsin Wang, Ta-Peng Chang, Jin-Jun Wang Dec 2010

Response Analysis Of Concrete Piles Subjected To Lateral Impact, Helsin Wang, Ta-Peng Chang, Jin-Jun Wang

Journal of Marine Science and Technology–Taiwan

One-dimensional wave theory is assumed to interpret longitudinal waves impulse response or impact echo testing results in concrete piles. Transient flexural waves tests are alternatively introduced to evaluate piles where the tops are inaccessible for conventional longitudinal wave testing. The resulting interpretation for flexural waves based on one-dimensional wave theory is improper due to various velocities at low frequencies. In this research, treating a pile as a waveguide, three-dimensional wave theory provides the dispersion relation between phase flexural velocity and frequency. Using the resonance solutions and first-mode flexural wave curve is a simple and efficient method to find the resonant …

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