Lei Feng, Key Laboratory of Computational Optical Imaging Technology, Academy of Opto-electronics, Chinese Academy of Sciences, Beijing, China
Wide spectral band, combination of imaging and spectrum and fine spectral detection capability are the outstanding advantages of imaging spectrometer. Rich spectral information combined with spatial image of the object point greatly improves the accuracy of target detection, expands the function of traditional detection technology, and realizes the qualitative analysis of target characteristics. Spectrometer plays an irreplaceable role compared with other technologies. It has been widely used in many military and civilian fields, such as land and ocean remote sensing, remote sensing monitoring of pollutants in atmosphere, soil and water, military target detection, medical spectral imaging diagnosis, scientific experiments and so on. Curved prism spectrometer is widely used because of its high energy and no ghost image. However, curved prism spectrometer is as a non coaxial symmetric system and its aberration theory is complex. Therefore, it is necessary to establish a numerical model and construct an initial structure to provide a good starting point for system optimization. In a practical imaging spectrometer based on prism, there are many aberrations when ray incidented on the surface of each element. In the design, it is very important to establish a mathematical model to analyze these aberrations. Curved prism is a kind of non-coaxial prism which is obtained by processing the front and rear surfaces of triangular prism into two spheres. Its front and rear surfaces are not coaxial with the optical axis, so its characteristics are complex. Firstly, on the basis of the primary aberration theory, the numerical calculation model of curved prism is established, and the optimal object distance of curved prism and the effective incident angle of curved prism are solved according to the principle of minimum aberration. For given system parameters, the coordinates of object points are known, and then the numerical model of curved surface prism spectrometer is established. The vector method is used to solve the incident and output vectors of given light rays. After transmission, the optical path extremum function is established, and the second-order partial differential equation is derived. The surface equation of each element is expanded by higher order Taylor series, that is, each surface is expressed as a functional expression of the incident point and structural parameters. A set of partial differential equations is constructed, and the least square method is used to solve the minimum of the equations, and then the initial structural parameters are calculated.
Mathematical computation, partial differential equations, vector solving, curved prism
Hamidreza Bolhasani, Amir Masoud Rahmani and Farid Kheiri, Department of Computer Engineering, Science and Research branch, Islamic Azad University, Tehran, Iran
Since 1982 that Richard Feynman proposed the idea of quantum computing for the first time, it has become a new field of interest for many physics and computer scientists. Although it’s more than 30 years that this concept has been presented but it’s still considered as unknown and several subjects are open for research. Accordingly, concepts and theoretical reviews may always be useful. In this paper, a brief history and fundamental ideas of quantum computers are introduced with focus on architecture part.
Quantum, Computer, Hardware, Qubit, Gate
Vahab Pournaghshband1 and Peter Reiher2 , 1Computer Science Department, University of San Francisco, San Francisco, USA, 2Computer Science Department, University of California, Los Angeles, Los Angeles,USA
The market is currently sated with mobile medical devices and new technology is continuously emerging. Thus, it is costly, and in some cases impractical, to replace these devices for new ones with greater security. In this paper, we present the implementation of a prototype for Personal Security Device a self-contained, specialized wearable device that augments security to existing mobile medical devices. The main research challenge for, and hence the state of the art of, the proposed hardware design is that the device, to work with legacy devices, must require no changes to either the medical device or its monitoring software. This requirement is essential since we aim to protect already existing devices, as making modifications to the device or its proprietary software often impossible or impractical (e.g., closed source executables and implantable medical devices). Through performance evaluation of this prototype, we confirmed the feasibility of having a special-purpose hardware with limited computational and memory resources to perform necessary security operations.
Wireless medical device security, Man-in-the-middle attack.
Hirantha Athapaththu1, Shavinda Herath1, Geeth Sameera1, Supun Gamlath1, Pramadhi Atapattu2 and Malitha Wijesundara3, 1Department of Software Engineering, Sri Lanka Institute of Information Technology, Sri Lanka,2Pulzsolutions (Pvt) Ltd., Sri Lanka Technology Incubator and 3Department of Information Systems Engineering, Sri Lanka Institute of Information Technology, Sri Lanka
This paper proposes a WebRTC based live teaching platform which facilitates the e-learning requirements of universities and other institutes. This solution includes lecture live streaming, lecture playback, a vector based interactive whiteboard, chatting and file sharing module and a real-time lecture movement tracking module using a PTZ camera. The system is capable of streaming two simultaneous streams of a 1080p camera and a 720p screen capture seamlessly using a network connection with 256KB/s bandwidth. Live streaming component is very less CPU intensive and it use around 14% of the CPU for streaming 10 simultaneous sessions with 10 listeners per each on a AWS t2.micro instance with 1 vCPU 2.5 GHz, Intel Xeon Family, 1 GiB memory. The original recorded videos get down-scaled and re-encoded to make the file size smaller up to 1% of the original file size. With adaptive streaming enabled player, users with an internet connection of 128KB/s bandwidth can experience an uninterrupted playback of the recorded lectures.
WebRTC, MPEG-DASH, PTZ Camera, e-Learning, Simulcast
Shailja Dalmia, Ashwin T S and Ram Mohana Reddy Guddeti, National Institute of Technology Karnataka, Surathkal, Mangalore, Karnataka, India
With the ever-growing variety of information, the retrieval demands of different users are so multifarious that the traditional search engine cannot afford such heterogeneous retrieval results of huge magnitudes. Harnessing the advancements in a user-centered adaptive search engine will aid in groundbreaking retrieval results achieved efficiently for high-quality content. Previous work in this field have made using the excessive server load to achieve good retrieval results but with the limited extended ability and ignoring on demand generated content. To address this gap, we propose a novel model of adaptive search engine and describe how this model is realized in a distributed cluster environment. Using an improved current algorithm of topic-oriented web crawler with User Interface based Information Extraction Technique was able to produce a renewed set of user-centered retrieval results with higher efficiency than all existing methods. The proposed method was found to exceed by 1.5 times and two times for crawler and indexer, respectively than all prevailing methods with improved and highly precise results in extracting semantic information from Deep web.
Search Engine, WWW, Web Content Mining, Inverted Indexing, Hidden Crawler, Distributed Web Crawler, Precision, Deep Web
Ikwu Ruth and Louvieris Panos, Department of Computer Sciences, Brunel University, London
Cyberspace has gradually replaced the physical reality, its role evolving from a simple enabler of daily live processes to a necessity for modern existence. As a result of this convergence of physical and virtual realities, for all processes being critically dependent on networked communications, information representative of our physical, logical and social thoughts are constantly being generated in cyberspace. The interconnection and integration of links between our physical and virtual realities create a new hyperspace as a source of data and information. Additionally, significant studies in cyber analysis have predominantly revolved around a single linear analysis of information from a single source of evidence (The Network). These studies are limited in their ability to understand the dynamics of relationships across the multiple dimensions of cyberspace. This
