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RISS 인기검색어
- 검색키워드
- 저자 : A. Teruya (검색결과 3 건)
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A Recursive High Level Synthesis System
Wang,J. C.,Teruya,M. Y.,Neto,J. V. Vale,Strum,M.,Jerraya,A. A. 대한전자공학회 1997 ICVC : International Conference on VLSI and CAD Vol.5 No.1
A hierarchical high level synthesis (HHLS) system, such as AMICAL, allows the obtaining of an architecture for a circuit from its behavioral description, written as a hierarchy of procedures and function calls, proper of large circuits. When specific modules are synthesized and reused as basic hardware modules in another HLS session, the resulting architecture may be inefficient due to operations overlap among the allocated hardware modules. This paper presents the structure of a CAD system that treats this problem by generating new hardware modules through a set of transformations to be applied to existing modules in an original library. We call the procedure of generating and reusing these new modules recursive high level syntheses (RHLS) which leads to a more efficient architecture. We propose a cost function that evaluates the quality of each architecture, taking into account area and time, and we present criteria to select the most promising transformation. The methodology is applied to a motor controller example (PID), showing its feasibility.
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Phase Diagram and Transport Properties of Y1−xNdxCo2 Pseudo-binary Alloys
A. T. Burkov,M. Takeda,A. Teruya,S. Watanabe,Y. Hiranaka,A. Nakamura,M. Hedo,T. Nakama,K. Yagasaki,Y. Takaesu,K. Uchima,Y. Uwatoko 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The electrical resistivity and the thermopower S of pseudo-binary Y1−xNdxCo2 alloys have beenmeasured at temperatures from 2 to 300 K under pressures up to 3.5 GPa. NdCo2 is a ferromagnetwith a Curie temperature TC of 98 K. In the ferromagnetic phase, it undergoes a 4f spin-reorientationtransition at TR = 40 K. At this transition, the easy direction of 4f magnetization is changed from[100] at temperatures above TR to [110] below TR. The system phase diagram TC(x, P) and TR(x, P)is inferred from the temperature dependencies of the electrical resistivity and the thermopower. The Curie temperature of the alloys, TC decreases with decreasing Nd concentration x and vanishesaround xc = 0.3. Above xc, the Curie temperature decreases with increasing pressure. The spinreorientationtemperature weakly depends on the composition and on the pressure until it mergeswith TC. There is a large region of the phase diagram, partly overlapping with the ferromagneticphase, where the cobalt 3d electron system is non-uniformly magnetized due to spatial fluctuationsof the 4f-3d exchange field related to a random distribution of Nd 4f magnetic moments over the Rsublattice. In this region, large static 3d magnetic fluctuations govern the electronic transport.
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Effect of Partial Magnetic Order on Resistivity and Thermopower of Ho(Co1−xAlx)2 Alloys
T. Nakama,C. Zukeran,A. Nakamura,A. Teruya,S. Hirakawa,S. Watanabe,Y. Hiranaka,M. Takeda,M. Hedo,K. Yagasaki,Y. Takaesu,K. Uchima,A. T. Burkov 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The electrical resistivity and the thermopower S of Ho(Co1−xAlx)2 alloys (x = 0 to 0.2) weremeasured at temperatures from 2 K to 300 K in magnetic fields up to 10 T. While (T) and S(T)of pure HoCo2 reveal abrupt changes at the magnetic ordering temperature TC, indicating a firstordertransition, the temperature variations of both properties across the ordering temperature inHo(Co1−xAlx)2 alloys clearly show that the type of magnetic transition changes under substitutionof Al for Co from first order to second order around x 0.06. (T) of the Al-substituted samples (x= 0.15 and 0.2) has a very unusual variation at temperatures below TC: in contrast to the expectedand usually-observed decrease of (T), the resistivity of Ho(Co1−xAlx)2 alloys (x = 0.15 and 0.2)increases at temperatures below TC. Moreover, the magnetoresistance of these alloys is positivearound TC; this is also in a sharp contrast to the usually observed negative magnetoresistance. We show that the anomalous resistivity and magnetoresistance in these alloys are related to themetamagnetic instability of the Co 3d subsystem and to the fluctuating local magnetic susceptibilitydue to atomic substitution. Due to this fluctuating local magnetic susceptibility, the uniformexchange field of 4f moments induces a non-uniform polarization of the 3d system, with staticspatial fluctuations of the local magnetization. This static magnetic disorder gives an additionalcontribution (m) to the electrical resistance in the alloys at temperatures below TC. The degreeof this disorder changes with decreasing temperature, resulting in specific variation of m withtemperature.
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