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Space Debris Population in the Geosynchronous Region After 100 Years
Yuya Ariyoshi,Toshiya Hanada 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
This paper shows a prediction of the environment in the geosynchronous region using an orbital debris environmental evolutionary model. We conducted three projection scenarios with changing the number of disposed satellites. The results of projections indicate that explosions of spacecraft and rocket upper stages form the origin of the orbiting fragments. Therefore, actions to reduce the explosions of the spacecraft and the rocket upper stages are effective for preserving the environment of the geosynchronous orbit. The collisions predicted in the baseline scenario are less than those in the non-disposal scenario.
AN EFFICIENT HEURISTIC APPROACH TO STATE ENCODING FOR PLA-BASED SEQUENTIAL CIRCUITS
Minato, Kenji,Ariyoshi, Hiromu,Shirakawa, Isao 대한전자공학회 1989 ICVC : International Conference on VLSI and CAD Vol.1 No.1
The present paper describes an efficient heunstic approach to state encoding of sequential circuits so that the total usage of silicon area of PLA-based two-level implementation for combinational circuits can be minimized. Apart from those conventional methods m which state encoding is determined one after another m a predetermined order of states, this approach is distinctive m that top priority is green to how to seek cubes which constitute a cover to be allocated to each group of states (where a group of states denotes a set of states which have the same next state and the same output for an input) on the basis of a magnitude estimation of cubes so that the total number of cubes to be used can be minimized. Implementation results are alsa shown to reveal how this approach is of practical use.
Face Hypercube Embedding Algorithm for Instruction Decoder
Abe, Motohisa,Ishimaru, Masakatsu,Ariyoshi, Hiromu,Shirakawa, Isao 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
We present an efficient face hypercube embedding encoding algorithm to minimize the Total number of product terms(cubes) in PLA-based implementation for instruction decoders. The algorithm works for a constraint relation matrix A which is defined such that a_(ij) = 1 if control signal i is activated by instruction j, a_(ij) = 0 otherwise. The encoding is performed progressively, row by row, finding a candidate cover for a cube which can be allocated to set oar the active instructions. The algorithm trys to assign a single cube to a control signal, and if it is unsuccessful for a specified code length, then the encoding length is extended. It follows that minimum number of cubes is necessarily guaranteed and effective area minimization is expected. Some interesting experimental results are reported.
Development of Contaminant Detection System using HTS SQUIDs
Ohtani, T.,Tanaka, S.,Narita, Y.,Ariyoshi, S.,Suzuki, S. The Korea Institute of Applied Superconductivity a 2015 한국초전도저온공학회논문지 Vol.17 No.4
In terms of food safety,mixture of contaminants in food is a serious problem for not only consumers but also manufacturers. In general, the target size of the metallic contaminant to be removed is 0.5 mm. However, it is a difficult task for manufacturers to achieve this target, because of lower system sensitivity. Therefore, we developed a food contaminant detection system based on high-Tc RF superconducting quantum interference devices (SQUIDs), which are highly sensitive magnetic sensors. This study aims to improve the signal to noise ratio (SNR) of the system and detect a 0.5 mm diameter steel ball. Using a real time digital signal processing technique along with analog band-pass filters, we improved the SNR of the system. Owing to the improved SNR, a steel ball with a diameter as small as 0.3 mm, with stand-off distance of 117 mm was successfully detected. These results suggest that the proposed system is a promising candidate for the detection of metallic contaminants in food products.