The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Recently, many high-efficiency buck-boost typed inverters for the photovoltaic (PV) grid-connection applications have been proposed. However, the PV grid-connection inverters are in idle state at nighttime or low insolation. Based on green energy demand, the presented work proposes a high-efficiency bidirectional buck-cascaded buck-boost (BuCBB) inverter. It is developed via the connection of a bidirectional...
Previously, we reported on the development and clinical evaluation of an ultrasound image-guided laparoscopic high-intensity focused ultrasound (HIFU) probe for kidney tumor ablation compatible with an 18mm trocar. Since then, the relentless march towards miniaturization of laparoscopic tools has led to the obsolescence of this trocar size, prompting a re-design of the probe to accommodate market...
Prime farmland (PF) is high-quality farmland and prime farmland protection area (PFPA) is a region designated for PFs special protection. However, rapid urbanization in China has led to a tremendous farmland loss. Based on RS and GIS technique, we proposed a semiautomatic method for designating PFPAs from high-resolution satellite imagery (HRSI), which involved object-based image analysis, farmland...
This paper proposes a novel LED driver, which consists of an isolated single-switch AC-DC converter with power factor correction (PFC) suitable for streetlight applications. Theoretical analysis of operational modes for the presented LED driver is included. In addition, a 65W-rated prototype circuit of the proposed LED driver with an input utility-line voltage of 110 V has been implemented and tested...
A full-bridge single-stage high power-factor charging circuit has accomplished a lithium battery charger. With no extra design effort required, the presented charger possesses Reflex charging function. Unlike the inherited resistive power dissipation of Reflex charging method, the developed circuit transfers the energy from the battery to an inductive component and return to battery later to fulfill...
This paper proposes a robust tracking method with application to the DC-AC PWM converter of the green energy. The proposed method has the merits of hyperbolic tangential sliding hyperplane (HTSH), grey prediction (GP) and firefly algorithm (FA). The HTSH has the robustness of classical sliding mode control (SMC) and increases the system's convergence speed. However, once a highly nonlinear load occurs,...
In the generation, transmission, and distribution sectors of the smart grid, intelligence of field devices is realized by programmable logic controllers (PLCs). Many smart-grid subsystems are essentially cyber-physical energy systems (CPES): For instance, the power system process (i.e., the physical part) within a substation is monitored and controlled by a SCADA network with hosts running miscellaneous...
This paper reports a novel multi-functional self-powered pressure sensor with hierarchical wrinkle structure which is able to detect pressure as well as harvest the mechanical energy. Due to the utilization of hierarchical wrinkle structure, the device shows high sensitivity of 2.0 kPa-1 with the excellent response performance of 0.15 ms (rise-time) and 0.7 ms (release-time), respectively. In addition,...
This paper presents a novel interleaved dc-to-dc converter that is mainly composed of two flyback converters. Prior to turning on the active switch of one flyback converter, its parasitic capacitance is discharged to nearly zero voltage by the induced current in the secondary winding of the coupled inductor of the other flyback one. By this mean, both active switches can achieve zero-voltage switching...
Supervisory Control and Data Acquisition (SCADA) systems monitor and control critical infrastructure such as the smart grid. As SCADA systems become increasingly interconnected and adopt more and more cyber-enabled components, the risks of cyber attacks become a major concern. Due to their decentralized organization, peer-to-peer (P2P) botnets are resilient to many existing takedown measures and can...
Similar diseases are often caused by their similar molecular origins, such as disease-related protein-coding genes (PCGs). And nowadays, the function of PCGs has been widely studied on a gene function network, where each node represents a gene and each edge indicates an interaction between pair-wise genes. Therefore, functional interaction between disease-related PCGs should be exploited to measure...
More than 1/3 of human genes are regulated by microRNAs. The identification of microRNA (miRNA) is the precondition of discovering the regulatory mechanism of miRNA and developing the cure for genetic diseases. The traditional identification method is biological experiment, but it has the defects of long period, high cost, and missing the miRNAs that only exist in a specific period or low expression...
Functional similarity between molecules results in similar phenotypes, such as diseases. Therefore, it is an effective way to reveal the function of molecules based on their induced diseases. However, the lack of a tool for obtaining the similarity score of pair-wise disease sets (SSDS) limits this type of application. Here, we introduce DisSetSim, an online system to solve this problem in this article...
A high power LED light-distribution modeling is proposed in this paper. A fitting polynomial of the double Gaussian curve is derived from the illumination measurement of a single LED. The luminance in the lighting area can be balanced by adjusting the lamp current individually according to the optical contour of each LED. From the laboratory experiments, the superposition of the luminance which is...
Existing topology controls enable wireless nodes to control parameters, such as adjusting the transmission power or switching operating modes between a sleep mode and an active mode, to achieve energy savings and prolong network lifetime. However, the topology controls assume that the operating frequency is fixed or can be changed in a narrow range of frequencies, thus the communication distance is...
Nowadays, smart meters are capable of collecting, processing, storing, and reporting users' energy consumption data with high fidelity. While facilitating a wide variety of applications such as demand response and anomaly detection, smart meter data exposes users to the risks of revealing sensitive information including occupancy states and activity patterns. Among privacy-preserving data collection...
Aircraft detection from remote sensing images of complex background is a challenging task. Existing aircraft detection methods usually consist of two separated stages: proposal generation and window classification, which may be suboptimal for the aircraft detection task. To overcome this shortcoming, we propose a unified aircraft detection framework to simultaneously predict aircraft bounding boxes...
Recent research has validated a proof-of-concept system for real-time underground tomography using wireless signal networks. Though models have been constructed to characterize wireless signal propagation through geo-media, there lacks a thorough investigation of antenna performance under geo-property variations. In this paper, we quantitatively show that soil condition variations affect antenna functional...
An equivalent electric circuit model is used to interpret the dynamic behavior of a photo-voltaic (PV) panel with a power electronic converter. The power electronic converter used for maximum power point tracking (MPPT) draws rippled currents from the PV panel. The circuit model is derived on basis of the static single-diode model, in which, the threshold voltage is approximately identical to the...
This paper presents an efficient fabrication process of highly aligned P(VDF-TrFE) nanofibers based on conventional far-field electrospinning (CFES) technique. By attaching a comb-shape electrode onto a fast rotating drum, the process combines the advantages of plane electrode and rotating-drum-collecting methods, which leads to the orientation of the deposited nanofibers and enhances it. Additionally,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.