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Convolutional Neural Network (CNN) has received remarkable achievements in hyperspectral image (HSI) classification. However, how to effectively implement spatial context that has been demonstrated to be crucial for classification of HSI is still an open issue. Current CNNs for hyperspectral classification are restricted into a small scale due to small-scale input and limited training samples. Therefore,...
Energy transfer from low mobility material to high mobility material is essential for optoelectronic application. We demonstrate Foster energy transfer from organic material (PTCDA) to monolayer MoSe2 though steady state and transient photoluminescence spectroscopy.
The modern image search system requires semantic understanding of image, and a key yet under-addressed problem is to learn a good metric for measuring the similarity between images. While deep metric learning has yielded impressive performance gains by extracting high level abstractions from image data, a proper objective loss function becomes the central issue to boost the performance. In this paper,...
This paper simulates scattering properties of metasurfaces by finite difference time domain(FDTD) method with generalized sheet transition conditions (GSTCs) to alleviate computational burden. It is found that a metasurface can be represented by the electric and magnetic polarization densities, which is related to electromagnetic field by GSTCs. The GSTCs are thereby implemented in 3D FDTD codes and...
Previous approaches for early-stage shipboard-power-system simulation were driven by a need to perform time-domain simulation during the early design stage and included an internal idealized representation of the control system. Herein, the reduced-order physical model of the power system is combined with an independent representation of the control system. This allows the benefits of faster simulation...
This paper investigates the dynamic characteristics of a coaxial magnetic gear (CMG) system by using the analytical model of the CMG, which provides a quick and accurate method to predict the dynamic performance of the CMG. The dynamic characteristics under different conditions such as start-up and the abrupt load changes are studied. Moreover, the dynamic pull-out torque which may cause loss of synchronism...
This paper first briefly surveys the near-field scanning for antenna measurements, then focuses on the near-field scanning for electromagnetic compatibility (EMC) applications. Key theories and practices are covered, and some latest development and open issues regarding the near-field scanning for EMC applications are finally presented.
Permanent-magnet (PM) direct-drive radial-axial flow turbine generator is widely used in the field of low-grade waste heat (below 200 °) Organic Rankine Cycle (ORC) power generation. However, special mechanical balance devices are needed to suppress the axial force produced by radial-axial turbine under the high-speed operation, resulting in not only the complex structure of the generator, but also...
The electrical conductivity of a carbon fiber reinforced plastic (CFRP) panel is highly anisotropic due to its varied fiber orientations. This paper presents an effective modeling method for studying the lightning direct effect on a multidirectional CFRP panel based on an electrical conductivity characterization of unidirectional samples. The characterization using 4-probe method is done with a simple...
This paper combines the design philosophies of synchronous and asynchronous, online and offline interactive teaching and learning environments to create a long-distance real-time educational support system based on intelligent perception (i-percieve), intelligent manageability (i-manage), intelligent interactive feedback (i-feedback), smart displays (i-view) and other core technologies. In addition...
With the advent of Software-as-a-Service (SaaS), SaaS developers are facing many more challenges associated with multi-tenancy and dramatically increased number of users, e.g., scalability, availability, increased cost of development/testing/deployment, high cost of customization. As most of them are highly common, it is becoming very desirable if a generic and powerful deployment platform can be...
The scattering properties of metascreens are characterized based on Babinet's principle and generalized sheet transition conditions for metafilms. Through this method, the reflection and transmission coefficients of metascreens could be computed analytically, under arbitrary incident angles and polarizations, once the surface susceptibilities of corresponding complementary metafilms have been extracted...
Convolutional Neural Networks (CNNs) with Bilinear Pooling, initially in their full form and later using compact representations, have yielded impressive performance gains on a wide range of visual tasks, including fine-grained visual categorization, visual question answering, face recognition, and description of texture and style. The key to their success lies in the spatially invariant modeling...
The energy efficiency of a data center largely depends on the performance of its cooling system, which consumes 30% to 40% of the total electricity. Very often, the cooling efficiency degrades over time and the degradation depends on various external factors and internal system states. This study is motivated by the need to estimate the degradation of system internal states from measured system operating...
Recent years have witnessed a growing interest in developing automatic parking systems in the field of intelligent vehicle. However, how to effectively and efficiently locating parking-slots using a vision-based system is still an unresolved issue. In this paper, we attempt to fill this research gap to some extent and our contributions are twofold. Firstly, to facilitate the study of vision-based...
One efficient approach for generating single photons is based on using a two-level atom, which inherently cannot emit more than one photon at the time. As early as the 1980s, this quantum feature was identified as the gateway to creating single photon sources (SPS's), where a regular excitation sequence would produce a stream of photons with photon number fluctuations below the shot noise. Such an...
Massive parallel business workflows running in the cloud are prone to temporal violations (namely intermediate runtime delays) due to various reasons such as service performance fluctuation and resource conflicts. To deliver satisfactory on-time completion, cloud workflow temporal verification is employed to accurately detect time delays of workflow activities and timely handle temporal violations...
Unlicensed taxis are widely considered as major obstacles to city traffic regulation and public safety. Thus, many governments have issued restrictions for car-hailing services and alleged that the use of unlicensed vehicles was illegal. However, it is very challenging that traffic administrative enforcements face limited manpower to prohibit unlicensed taxis, due to costly and time-consuming procedure...
This paper discusses the roles and characteristics of group members in collaborative learning under a network environment, using case study and content analysis. This paper focuses on the following aspects: design of research method, the data collection, the case analysis and discussion, the research conclusion and the existing question. The results show that implementing cooperative learning needs...
This paper proposes to evaluate the installed performance of a slotted waveguide (SWA) antenna array on large platforms using an equivalent model based on near-field samplings over slots. The tangential electric fields over the SWA slots were first sampled to obtain equivalent magnetic current sources. The equivalent sources were then put on a closed perfect electric conducting box, same profile of...
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