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.
A wavefront correction near the focus of a Pettawatt laser system is demonstrated. After correction, the Strehl ratio of focus is improved to 0.90, and the focal spot size using the f/4 off-axis parabola is reduced to 6.20 × 6.77 μm2. With full peak power, the peak intensity of 2.46 × 1021 W/cm2 is obtained.
An electrically tunable microstrip phase shifter for applications of phased array antennas is designed based on nematic liquid crystal material. The experimental results show a tunable differential phase shift up to 270 at 10 GHz, and the insertion loss is less than 9 dB at 1–10 GHz range. By optimizing both of the liquid crystal tuning efficiency and overall loss, an average figure-of-merit (FoM)...
General-purpose distributed systems for data processing become popular in recent years due to the high demand from industry for big data analytics. However, there is a lack of comprehensive comparison among these systems and detailed analysis on their performance. In this paper, we conduct an extensive performance study on four state-of-the-art general-purpose distributed computing systems. Our results...
Users' online behavior, generated from endpoints of e-commerce website and app, is regarded as big data which can create large business value by mining them to acquire insights of users' preference, inclination and purpose. A good ranking result of product search and product assortment in online category classification can lift user's click rate, increase purchasing conversion rate and improve customer...
A temporal graph is a graph in which vertices communicate with each other at specific time, e.g., A calls B at 11 a.m. and talks for 7 minutes, which is modeled by an edge from A to B with starting time “11 a.m.” and duration “7 mins”. Temporal graphs can be used to model many networks with time-related activities, but efficient algorithms for analyzing temporal graphs are severely inadequate. We...
Perceptual audio hashing, which summarizes big audio data into compact and robust digest, provides a useful tool for the identification, retrieval, authentication, and other information processing of multimedia contents. This paper proposes a perceptual audio hashing algorithm based on Radon transform in wavelet domain. The wavelet approximate coefficients are mapped into a two dimensional matrix...
In order to realize the copyright protection of audio information and improve the security of the watermarking algorithm, a secure robust audio watermarking algorithm via quantization of the random correlation coefficients in lifting wavelet transform domain and QR decomposition is proposed Firstly, lifting wavelet transform is performed on the audio data, the approximate components are mapped into...
In this paper, a new two levels propagated neighborhoods based collaborative filtering method (PNCF) is proposed for developing effective and efficient recommendation system. Traditional collaborative filtering (CF) algorithms focus on construct k-nearest neighborhood for each item/user from user-item purchase/rating matrix, such as item-based k-nearest-neighbor collaborative filtering method (itemKNN)...
Failure Mode and Effects Analysis (FMEA) is a well-known design tool used to analyze component failures and identify the resultant effects. Traditional FMEA model requires engineers' input on estimating technical detection difficulty of part failure. Moreover, failure occurrence can only be computed based on historical maintenance data. However, under the IoT based environment, sensors installed on...
This paper optimized the inventory of a multilevel distribution network with intermittent lead time extension resulting from disruptive transportation infrastructure damage because of regional weather and non-stationary demands. We proposed a hierarchical solution framework of a centralized inventory control policy to tackle with intermittent lead time fluctuation and demand fluctuation, leading to...
With fierce competition in traditional manufacturing industry, it is urgent to find an effective way to gain competitive edge for enterprises to win market share. In this paper, we introduce novel ideas on new product design and customized product marketing in order to improve enterprises competitiveness by discovering business insights from multidimensional data, including product/customer profiles,...
House of Quality(HoQ) is an effective way to transform customer requirement into technical solution, aiming at helping R&D department of manufacturers to design products tailored to recent market requirement. Traditional HoQ relies highly on large-scale market survey data, which in reality costs extremely high for manufacturer. In this paper, rather than applying survey data, we propose a novel...
Enterprise resource planning (ERP) systems present a holistic view of the business from single information and IT architecture. But ERP systems are comprehensive, huge and complex systems and warrant careful planning and execution not ensure the successful implementation. A business process is set of interrelated activities which have definable inputs result in output that adds value from a custom...
Collaborative filtering (CF) based recommendation system, which can automatically predict unknown preference of a user to certain products and then generate meaningful recommendations using a explicit known ratings matrix, has become one of the most successful approaches in web-based activities such as e-commerce. As users will typically not bother to rate items they bought, data sparsity is one main...
Marketing is all about the process of communicating the value of a product or service to customers in order to stimulate sales, while target marketing maximizes the return on investment into the marketing activities. We present a piece of practice to transform massive data into actionable insights and guidance using statistical analysis and data mining methods, which helps a leading home appliance...
The non-collinear optical parametric chirped pulse amplification in yttrium calcium oxyborate was experimentally demonstrated. The amplified energy of 3.36J centered at 800nm was generated with pump of 35J. After compression, the pulse duration was 44.3fs.
Business Process Management is widely used in enterprises, and modeling and validation of cross enterprise services composition is key challenge to ensure the correctness of cross enterprise collaboration. As the detail of a business process in one enterprise is not suitable for open to other enterprises, this makes the modeling and validation of cross enterprise services composition more complex...
Solar power, regarded as natural, clean and inexhaustible energy, has nowadays attracted attention of both academic researchers and industrial practitioners. Solar panel is a popular device for family to heat water and to produce electricity to feed home electric devices. Based on the fact that home devices are commonly used in the evening, so it is intuitive and advisable to store electricity produced...
Process models are used widely in business process management related initiatives, such as business process optimization, IT system implementation, etc. In large amount of practices, multiple process models are maintained simultaneously and are required to keep consistent with each other. Synchronization of multiple process modules has been studied as a combination of several two-process-model synchronization...
Public bike system for proximity travel is widely used in urban cities all over the world. Main reasons for launching public bike program is to reduce carbon footprint so as to prevent greenhouse effect and to solve Last-Mile problem in order to make convenient for citizens. However, we may encounter awkward cases in peak hours (from 7:00 to 9:00 and 17:00 to 19:00) that no bike is available at some...
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.