Most images used in visualization are computed with the planar pinhole camera. This classic camera model has important advantages such as simplicity, which enables efficient software and hardware implementations, similarity to human eye, yields familiar user. However, only a single viewpoint, limits parts of scene there is direct line sight. In this paper we introduce curved ray address viewpoint limitation. Rays C <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

This paper presents a bidirectional rotary actuator for electrohydraulic valves using permanent-magnet rotor with output torques and angular displacements proportional to the excitation currents. Finite-element analysis provides static characteristics of is coupled nonlinear time domain simulation determine dynamic performance. The measured simulated results agree well show that can produce up plusmn0.65 Nm, linear plusmn8deg hysteresis less than 4%, frequency bandwidth (-3 dB) about 190 Hz.

Contrails (condensation trails) are line-shaped ice clouds caused by aircraft and a substantial contributor to aviation-induced climate change. Contrail avoidance is potentially an inexpensive way significantly reduce the impact of aviation. An automated contrail detection system essential tool develop evaluate systems. In this article, we present human-labeled dataset named OpenContrails train models based on GOES-16 Advanced Baseline Imager (ABI) data. We propose model that incorporates...

We describe a technique to measure ocean wave period, height and direction. The is based on the characteristics of transmission backscattering short-range K-band narrow beam continuous radar at sea surface. transmits receives signals close surface low-grazing angle. By sensing motions dominant facet that strongly scatters back located directly in front radar, orbital velocity can be measured from Doppler shift received signal. direction are determined relationships among velocity, shift....

Activity recognition using motion sensors, which denotes a person's posture, has become one of the most important research topics in body sensor network. With rapid development monitoring and sensing applications, activity on mobile devices or portable platforms drawn lots

The Fuzzy C-Means (FCM) algorithm is commonly used for clustering. weighting exponent tn and the clustering number C are important parameters in FCM algorithm. Conventional fuzzy method must use both of two prespecified parameters, so this paper we analyses original studies on optimal selection methods m c by introducing decision theory validity index V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">kwon</sub> basing geometric structure...

Electromagnetic (EM) vortex wave carrying orbital angular momentum (OAM) can potentially be utilized to achieve azimuthal super-resolution in synthetic aperture radar (SAR) imaging realms. This contribution proposes an algorithm based on the compressed sensing (CS) theory for side-view EM strip-map SAR. Firstly, observation geometry and echo signal model are described established. Subsequently, algorithm, including Bessel function compensation, range compression azimuth process, is carried...

A compact printed log-periodic dipole antenna (LPDA) with distributed inductive load has been presented in this paper. By adding a stub on the top of each element, dimension LPAD can be reduced by 60%. The obtained an impedance bandwidth 10GHz (8GHz-18GHz). According to simulation results, designed structure achieves stable radiation patterns throughout operating frequency band.

This paper describes a radar system designed for deployment on an unmanned surface craft under development in the Autonomous Ocean Systems Laboratory of Memorial University. The includes two sub-systems: one long-range that detects sea-surface objects few kilometers away, other short-range frequency modulated continuous wave radar. not only near obstacles but also senses sea state to enhance navigation safety craft. provides useful complement blind zone and largely determines survival...

Misalignment tolerance ability and vertical distance adaptation are equally vital for both the power transfer data exchange in simultaneous wireless (SWPDT) systems. The coupling mechanism with anti-series coil is explored detail, it proven that not only misalignment but also can be significantly improved well design parameter. Data injected into extracted from partial receiving coil. link analyzed, number of turns inside designed to stabilize mutual inductance. Moreover, method distribution...

In this paper, an ocean wave measurement technique and a newly developed short-range K-band radar are tested. previous work, the its feasibility were studied based on numerical simulations tank experiments, while performance at sea was still unknown. Surface current, Stokes drift, breaking can greatly complicate interpreting backscatters. The of needed to be further investigated with experiments. Experiments carried out stationary site from moving platform. transmitted continuous received...

A wave observation system by GPS signal is proposed to measure information, such as wavelength and direction. In this an arrayed antenna used receive multi-path signals reflected from sea surface software receiver designed process composite extract information. According the signal, indispensible performance characteristics of RF front-end has been analyzed computer simulation. Autocorrelation function Teager-Kaiser energy operator are utilized core functions receiver. The verified that can...

Remote visualization has become both a necessity, as data set sizes have grown faster than computer network performance, and an opportunity, laptop, tablet, smartphone mobile computing platforms ubiquitous. However, the conventional remote (CRV) approach of sending new image from server to client for every view parameter change suffers reduced interactivity. One problem is high latency, be traversed twice, once communicate parameters transmit client. A second quality due aggressive...

A method is proposed for the retrieval of period, height and direction ocean waves from K-band radar signal. This designed frequency modulated continuous wave mounted on an unmanned surface craft. The signals transmitted, reflected received at sea are analyzed. signal shifts with water particle movements. relationship between shift characteristics established. can be retrieved through extracting analyzing periodicity amplitude deterministic relationship. Numerical simulations about processes...

With the wide application of embedded devices, security problems caused by malware intrusion into systems are increasing. Existing detection models difficult to be deployed a variety resource-constrained devices. Undetectable can cause devices malfunction and potentially spread other causing massive device failures. We propose TPM-based remote auditing scheme for software, aiming at problem that existing on systems. This paper analyzes threats faced system schemes raised objectives. use...

In this paper, four different structures are proposed to optimize electromagnetic thrust for the primary and secondary pole linear induction motors.Firstly, two-dimensional topology structure of motor is established, correlation equation established.Secondly, optimization carried out by chamfer method trapezoidal method.Then, slotted mixed with conductivity materials thrust.At same time, a model high permeability under ideal conditions from angle relative aluminum plate.Finally, optimized...

针对传统球面面形干涉测量中手动调整被测件姿态精度低、速度慢的问题,提出了激光共焦干涉面形快速高精度自动测量方法。该方法通过共焦精密定焦技术实现了对被测件共焦位置的高精度轴向定位;通过五维自动调整架对被测件进行姿态调整,实现了被测件的高精度横向定位;通过Zernike拟合对被测件进行精调以减小离焦误差和倾斜误差,实现了对干涉面形的零条纹调整。最终实现了激光共焦干涉面形自动测量。构建了激光共焦干涉面形测量系统,实验表明:该方法的面形测量结果与Zygo干涉仪的测量结果相差0.000 6<italic>λ</italic>,重复测量精度可达0.001 9<italic>λ</italic>,平均单次干涉面形测量时间为16.5 s,与手动调整至零条纹相比测量效率提高了1.56倍。该方法为干涉面形的快速高精度测量提供了一种有效的手段。

Almost a century ago, Edward Sapir noted that we "respond to gestures with an extreme alertness" according "an elaborate and secret code is written nowhere, known none, understood by all". Here are our vision initial results towards breaking the of effective instructor in education.

This paper presents two from-point visibility algorithms: one aggressive and exact. The algorithm efficiently computes a nearly complete visible set, with the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">guarantee</i> of finding xmlns:xlink="http://www.w3.org/1999/xlink">all</i> triangles front surface, no matter how small their image footprint. exact starts from set finds remaining robustly. algorithms are based on idea generalizing...

This paper presents an efficient algorithm for noncoherent demodulation of Gaussian frequency shift keying (GFSK) signals when the receiver is operating in a decision-feedback mode to aid current symbol based on previous decision bits. Enlightened by data-aided DPSK signal, maximum likelihood (ML) GFSK derived. The proposed adopts recursive structure that significantly reduces computational cost compared with standard ML methods. simulation results show method achieves comparable...