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.
The Sea-Wing7000 underwater glider, developed by the Shenyang Institute of Automation, CAS, is an instrument platform designed to glide to depths of 7000 meters for the application of deep-sea environment variables observation. Similar in structural layout to the “Sea-Wing” glider[1], to achieve these depths, The “Sea-Wing7000” using composite of carbon fiber / resin as the pressure hull. A “Sea-Wing7000”...
Code review is known to be of paramount importance for software quality assurance. However, finding a reviewer for certain code can be very challenging in Modern Code Review environment due to the difficulty of learning the expertise and availability of candidate reviewers. To tackle this problem, existing efforts mainly concern how to model a reviewer's expertise with the review history, and making...
Failure location and mechanism analysis about a microsystem fault is presented in this work. The fault phenomenon of abnormal low output power amplitude appears only at low temperature during thermal cycle test. A series of analysis including internal fault location and replacing parts for validation help to find the fault origin: a line winding inductor. The failure mechanism of the failed inductor...
In all the security issues in wireless sensor networks (WSNs), session key exchange is fundamental one with a great challenge. Owning to the semi-group property and one-way trapped characteristic of Chebyshev polynomials, an enhanced key exchange scheme based on Chebyshev chaotic map for WSNs was proposed in this paper. Our scheme aims at increasing the security of the session key between nodes. According...
Optical Wavelength Division Multiplexing (WDM) networks based on fixed grid technology have exposed some questions, including wasting of bandwidth resources in multi-domain heterogeneous networks. Flexible grid technologies can provide end-to-end optical path according to the client flexibly and effectively. However, it is unpractical to deploy a one-time green-field flexible grid technologies subjected...
In opportunistic networks, forwarding based protocols lead to a large amount of data flow to the highly connected nodes and unfairness of the nodes' traffic load, finally, it makes the highly connected nodes suffer congestion and results in the messages were discarded. To solve this problem, a congestion control algorithm based on Social Awareness is proposed in this paper. When choosing the next...
Understanding and predicting cellular traffic at large-scale and fine-granularity is beneficial and valuable to mobile users, wireless carriers and city authorities. Predicting cellular traffic in modern metropolis is particularly challenging because of the tremendous temporal and spatial dynamics introduced by diverse user Internet behaviours and frequent user mobility citywide. In this paper, we...
This paper presents a new technology to realize a millimeter wave antenna with circular polarization. The antenna has a complex structure which consists of several dielectric slabs to achieve wideband, high-gain performance. Thank to the 3D printing technologies, the complex antenna can be easily fabricated with low cost. The proposed antenna has a wide impedance bandwidth of 50% from 45 to 75 GHz...
Compressed sensing is a novel theory which combined signal sampling and compression together, and this paper propose an improved reconstruction algorithm. Firstly this paper analysis the sparsity of the power quality disturbance signal and the selection of the measurement matrix, then, this paper proposes an improved regularization sparsity adaptive matching pursuit algorithm (RCoSaMP) on the basis...
Freeway bottlenecks restrict traffic flow on freeway corridors during peak periods. Previous research claim that the pre-queue flow (PQF) shifts to the queue discharge flow (QDF) after the onset of bottleneck. The flow transition is a complicated and stochastic process. Moreover, driver behaviors differ among lanes. Previous research has been devoted to investigating the flow transition process and...
Collaborative filtering algorithm is one of the most successful technologies in recommendation system, and similarity calculation is the core. To solve the problem that the traditional similarity calculation method is not accurate in the case of sparse data, a cooperative filtering recommendation algorithm combining weighted entropy and user attribute is proposed in this paper. This algorithm applies...
Electromagnetic radiation for a printed circuit board (PCB) midplane connector is studied in this paper. By applying integral-equation (IE) based method and characteristic mode (CM) analysis, the current is split into radiating and non-radiating ones. The radiated power from each part of the structure can be quantified using the radiating current. Therefore, the radiation hot spot can be identified...
Spectral phase coding by using 0/π-phase-shift and ±π/2-phase-shift are thoroughly studied. The security vulnerability and improvement are analysed by evaluating the encoded signal. ίπ/2-phase-shift spectral phase coding can guarantee the security by hiding the optical code in the encoded signal. In addition, coding performance of both spectral phase coding techniques is investigated by measuring...
a semiconductor device adopts glass insulators to realize the sealing insulation between metal leads and case. Abnormal low resistance phenomenon between the metal lead and shell take places in several devices after working under normal pressure, temperature and humidity for a certain period. The normal resistance is usually at the level of Megohm, while the abnormal resistance is instable and from...
The solder points cracking of a component with package of ceramic ball grid array (CBGA) type is studied in the paper. The cracking cause is found and the failure mechanism is clarified. The weakness of the package structure design is demonstrated by comparing the experiment results of two kinds of components, which provides guidance for the reliable design and application.
Hyperspectral imaging (HSI) is a relatively new modality in medicine and can have many potential applications. In this study, we developed label-free hyperspectral imaging for tumor margin assessment. HSI data, hypercube (x,y,λ), consists of a series of images of the same field of view that are acquired at different wavelengths. Every pixel in the hypercube has an optical spectrum. We collected surgical...
Crystal Oscillators are widely used in many systems; and phase noise is one of the most important specifications of crystal oscillators. It is well known that crystal oscillators are acceleration sensitive devices. Vibration will degrade the phase noise of crystal oscillators used in many applications such as aircrafts, vehicles, and missiles, etc. This paper analyses the design of a novel low phase...
The paper investigates equilibrium decisions for the dual channel large product supply chain where the manufacturer produces large products and sells it through the traditional channel and the direct sale channel applying the cooperative delivery strategy with the retailer. We take the Stackelberg game model led by the retailer to explore the optimal condition where the cooperative delivery strategy...
Different from representation learning models using deep learning to project original feature space into lower density ones, we propose a feature space learning (FSL) model based on a semi-supervised clustering framework. There are three main contributions in our approach: (1) Inspired by Zipf's law and word bursts, the feature space learning processes not only select trusted unlabeled samples and...
This work investigates the downlink resource allocation (RA) problem in orthogonal frequency division multiplexing (OFDM)-based cognitive radio networks. The objective of this work is to develop a fair RA-algorithm that maximizes the capacity of secondary users (SUs) and in the same time limits the interference caused to the primary users. The fairness condition is formulated as a minimal data condition...
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.