1994 Vol.16 No.2, Published: 19 March 1994
Articles |
Reviews |
|
|
|
|
|
|
Articles |
Feng Dazheng
A MODEL OF NEURAL CIRCUIT WITH ADAPTION AND NONLINEAR CONNECTION
|
1994 Vol. 16 (2): 113-120
[Abstract]
(
1564 )
[PDF 1258KB]
(
509
)
DOI:
Based on physiological properties of synapse, soma and axon, this paper presents and analyses a model of neural circuit which can approximately simulate input-output relation, strength-duration curve, adaption and nonlinear connection of real neuron. The obtained result; show that the model approximates to realistic principles of neural computation better than the available neural network. The impulse -coded WTA (Winner takes all) network constructed with the above model finds the winner more effectively th...
|
|
Wu Meng; Gong Bi; He Zhenya
A NEURAL NETWORK BASED FAULT FUZZY DIAGNOSTIC SYSTEM
|
1994 Vol. 16 (2): 121-126
[Abstract]
(
1585 )
[PDF 1103KB]
(
461
)
DOI:
A fault fuzzy diagnostic system (FFDS) based on neural network and fuzzy logic hybrid is proposed. FFDS consists of two modes: a fuzzy inference mode and a rules learning mode. The fuzzy inference rules are stored in the memory layer. The excitation levels of the memory neurons reflect the matching degree between the input vector and the prototype rules. In the rules learning mode, the rules can be produced automatically through the cluster process. As a application case of this diagnostic system, the fault diagnosis experiment of the rotating axis is simulated.
|
|
Zhang Jiashu①;Li Shiguang②
BINARY DISCRETE OBJECT DETECTION FROM 3-D SPACE OF SERIES SLICES
|
1994 Vol. 16 (2): 127-133
[Abstract]
(
1472 )
[PDF 1465KB]
(
468
)
DOI:
This paper gives moment s description of 3-D object and presents similar moment matching detection method for binary discrete objects from 3D-space of series slices. Theoretical analysis and experimental results show that it saves computer memory extremely and can easily be realized, and it decreases calculation and improves detecting ratio. Number of objects, start section and end section centers of each object are obtained after processed whole series slices.
|
|
Zheng Huanqun;Wang Chengxuan; Wang Yuhung
THE STUDY OF OPTIMAL TOLERANCE DESIGN METHOD -THE INSCRIBED GLOBE METHOD BASED ON ORTHOGONAL ARRAY OPTIMIZATION
|
1994 Vol. 16 (2): 134-141
[Abstract]
(
1853 )
[PDF 1284KB]
(
948
)
DOI:
An optimal tolerance design method is presented. The method uses an initial objective function in the design process, and a close-center objective function for reducing the design time. The orthogonal array optimization method is used in order to simplify the method. The center values and tolerances of design parameters can be determined simultaneously by searching out the radius and center of the biggest inscribed globe. Finally, it is necessary to design center value and tolerance synthetically for reaching the aim of optimal design. Two examples are presented to illustrate that the method is feasible and has superiority.
|
|
Huang Ruji
MODIFIED DOUBLE-GRAPH DECOMPOSITION ANALYSIS FOR FINDING SYMBOLIC NETWORK FUNCTIONS
|
1994 Vol. 16 (2): 142-147
[Abstract]
(
1581 )
[PDF 1030KB]
(
525
)
DOI:
The concepts of complementary cofactor pairs, normal double-graphs and feasible torn vertex sets are introduced. By using them a decomposition theorem for first-order cofactor C(Y) is derived. Combining it with the modified double-graph method, a new decomposition analysis-modified double-graph decomposition analysis is presented for finding symbolic network functions. Its advantages are that the resultant symbolic expressions are compact and contain no cancellation terms, and its sign evaluation is very...
|
|
|
Shi Xiaowei; Liang Changhong
EQUIVALENT STATEMENT TO THE UNITARY CONDITION FOR LOSSLESS NETWORK
|
1994 Vol. 16 (2): 158-162
[Abstract]
(
2086 )
[PDF 825KB]
(
556
)
DOI:
The generalised magnitude-symmetry theorem for lossless network is extended, the phase information previously omitted is supplemented. The extended theorem is equivalent to the unitary condition for lossless network rigorously. Two illustrations are given for the applications of the theorem to analysing the properties of lossless network.
|
|
Yin Wenyan; Wang Wenbing
THE DYADIC GREEN S FUNCTION THEORY FOR ONE/TWO CYLINDRICAL LAYERS OF CHIRAL MEDIUM AND ITS APPLICATIONS
|
1994 Vol. 16 (2): 163-172
[Abstract]
(
1600 )
[PDF 1438KB]
(
459
)
DOI:
The expression of dyadic Green s function for one and two cylindrical layers of chiral medium are derived by using the method of scattering superposition, for which the electric current sources are placed both inside and outside of a chiral cylinder and a cylindrical chirodome. Then the radiation characteristics of a point dipole antenna on the axis of the chiral cylinder and cylindrical chirodome are analysed. The results show that the polarized states of radiated fields can be changed by choosing the size of chiral cylinder or the thickness of cylindrical chirodome. Also, the expressions of dyadic Green's function given in thid paper can be directly use to analyse the radiation characteristics of cylindrical chirostrip antenna.
|
|
Xia Jun; Liang Changhong
THE MEASUREMENT OF COMPLEX PERMITTIVITY OF ANISOTROPIC DIELECTRICS BY MEANS OF AN ELECTROMAGNETIC OPEN RESONATOR
|
1994 Vol. 16 (2): 173-180
[Abstract]
(
1660 )
[PDF 1143KB]
(
501
)
DOI:
By applying the perturbation theory and complex-point method, theoretical research of the measurement of complex permittivity of uniaxial anisotropic materials, by means of an electromagnetic open resonator has been made, and the double refraction phenomenon due to the anisotropy of measured dielectric materials has been quantitatively analyzed. Finally, at 8mm band, an automated electromagnetic open resonator measurement system was used, and measurements have been made on some single-crystal quartz speciments.
|
|
Li Chao
CLOCK CONTROLLED SEQUENCES OVER GF(pα)
|
1994 Vol. 16 (2): 189-192
[Abstract]
(
1602 )
[PDF 659KB]
(
414
)
DOI:
A class of clock-cross-controlled sequences over GF(pα) (p ≥ 2 is a prime number, α >1 is a positive number) using the quadratic character of GF(pα), i.e., LSRg[d0,d1,d2]-clock-cross-controlled sequences is introduced. When the feedforward function g(x1,x2,…,xn), which is used as the controlling shift clock, is a quadratic form of GF(pα), the properties of the period and the linear complexity of this sequences are discussed.
|
|
Zhao Zhengyu
DIGITAL PROCESSING OF THE POLARIZATION STATE OF GEOPHYSICAL ULF SIGNALS
|
1994 Vol. 16 (2): 193-197
[Abstract]
(
1550 )
[PDF 868KB]
(
493
)
DOI:
Evaluation by running window smoothing is used for the digital pro-cessing of the polarization of geophysical ULF signals. The observed signals are resolved into two orthogonal complex components so that it is no longer necessary to consider the phase and amplitude of the signals simultaneously.
|
|
Wang Shaoqing①; Lin Weigan①;Zhang Mei②
OPTIMUM DESIGN OF SHORT-SLOT HYBRID POWER COMBINER
|
1994 Vol. 16 (2): 198-202
[Abstract]
(
1715 )
[PDF 842KB]
(
528
)
DOI:
A new idea of representing the mutual injection locking phenomena in the short-slot hybrid power combiner by a model of negative nonlinear network is proposed. This model thoroughly represents the nonlinear characteristic of the combiner. After the nonlinear equations of the combining system are derived, a method of optimizing the parameters of the combined oscillators to achieve a maximum power combining efficiency is given. The optimum results agree with experimental ones quite well.
|
|
Lei hailiang
DIRECT ALGORITHM FOR FORMING MESH EQUATIONS OF THE ACTIVE MULTI-WINDING COUPLED NETWORK
|
1994 Vol. 16 (2): 203-206
[Abstract]
(
1552 )
[PDF 726KB]
(
558
)
DOI:
The topological expressions of the circuit elements with meshs are put forward. Then, direct algorithm of mesh equations of the active multi-winding coupled network, which is planar, is formulated. The number of the network equations equals the mesh number of the network. It is less than the equations of the modified nodal approach. The procedure of forming equations of this algorithm is simpler than that of the current nodal and the loop approach.
|
|
Huang Liuxing; Wei Tongli; Zheng Jiang; Cao Juncheng
MODEL AND MODELING OF LOW TEMPERATURE CURRENT GAIN OF POLYSILICON EMITTER BIPOLAR TRANSISTOR
|
1994 Vol. 16 (2): 207-211
[Abstract]
(
1830 )
[PDF 869KB]
(
723
)
DOI:
A unified model of low temperature current gain of polysilicon emitter bipolar transistors based on effective recombination speed method is presented, incorporating bandgap narrowing, carrier freezing-out and tunneling of holes through interface oxide. The modeling results based on the unified model are in good agreement with experimental data.
|
|
Yuan Xiaojun; Wang Guangming; Lin Weigan
AN APPROXIMATE SOLUTION OF NONLINEAR WAVE EQUATION
|
1994 Vol. 16 (2): 212-216
[Abstract]
(
1440 )
[PDF 681KB]
(
533
)
DOI:
A uniformly valid approximate solution of a kind of nonlinear wave equations is studied, the research results indicate that the solution of this kind of equatiors can be represented by Airy function approximately. The usually used W. K. B. approximation is the first order approximation of the present result in the region far away from the turning point of refractivity. At the turning point of refrac-tivity, the present result is still valid.
|
|
|
|
|
Reviews |
|