Current Issue : July - September Volume : 2019 Issue Number : 3 Articles : 5 Articles
Broadcast encryption (BE) allows a sender to broadcast its message to a set of\nreceivers in a single ciphertext. However, in broadcast encryption scheme,\nciphertext length is always related to the size of the receiver set. Thus, how to\nimprove the communication of broadcast encryption is a big issue. In this\npaper, we proposed an identity-based homomorphic broadcast encryption\nscheme which supports an external entity to directly calculate ciphertexts and\nget a new ciphertext which is the corresponding result of the operation on\nplaintexts without decrypting them. The correctness and security proofs of\nour scheme were formally proved. Finally, we implemented our scheme in a\nsimulation environment and the experiment results showed that our scheme\nis efficient for practical applications....
Growing from water, Can Tho is a region on delta area of Southern Vietnam\ncarved up by the currents of Mekongâ??s tributary, where settlements and water\nare closely interact. Being an important city, Can Tho puts in high expectations\nfor investment calls that activate the growth of the city towards a new\ndirection of urbanism. This trend seems to neglect its nature way of coping\nwith water. In this connection, the intention of the research is to understand\nthe urbanism in delta area of Can Tho, its confidences and fears the region\nhas to experience and deal with. The intensive field work reveals an evaluation\ntowards Can Thoâ??s spatial quality and major water problems. As a closing,\nthe last section has share thoughts that different strategies of urban design\nto retrieve back the wisdom of living with water which are required for\nfuture urbanity of Can Tho region....
The field of nanosatellites is constantly evolving and growing at a very fast speed. This creates a growing demand for more\nadvanced and reliable EDAC systems that are capable of protecting all memory aspects of satellites. The Hamming code was\nidentified as a suitable EDAC scheme for the prevention of single event effects on-board a nanosatellite in LEO. In this paper, three\nvariations of Hamming codes are tested both in Matlab and VHDL. The most effective version was Hamming [16, 11, 4]2. This\ncode guarantees single-error correction and double-error detection. All developed Hamming codes are suited for FPGA\nimplementation, for which they are tested thoroughly using simulation software and optimized....
In this paper, we use a Circle Restricted Three-Body Problem (CRTBP) to\nsimulate the motion of a satellite. Then we reformulate this problem with the\ncontroller into the description using Koopman eigenfunction. Although the\noriginal dynamical system is nonlinear, the Koopman eigenfunction behaves\nlinearly. Choosing Jacobi integral as the Koopman eigenfunction and using\nthe zero velocity curve as the reference for control, we are allowed to combine\nwell-developed Linear Quadratic Regulator (LQR) controller to design a nonlinear\ncontroller. Using this approach, we design the low thrust orbit transfer\nstrategy for the satellite flying from the earth to the moon or from the earth to\nthe sun....
One of the major causes of ecological and environmental problems comes from the\nenormous number of discarded waste tires, which is directly connected to the exponential growth\nof the worldâ??s population. In this paper, previous works carried out on the effects of partial or full\nreplacement of aggregate in concrete with waste rubber on some properties of concrete were\ninvestigated. A database containing 457 mixtures with partial or full replacement of natural\naggregate with waste rubber in concrete provided by different researchers was formed. This\ndatabase served as the basis for investigating the influence of partial or full replacement of natural\naggregate with waste rubber in concrete on compressive strength. With the aid of the database, the\npossibility of achieving reliable prediction of the compressive strength of concrete with tire rubber\nis explored using neural network modelling....
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