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1990 Vol. 12, No. 1
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1990, 12(1): 1-6.
Abstract:
A simple and practical rectangular transform and the vector quantization technique are described. A method for image data compression by combining the rectangular transform with vector quantization technique is presented. By using this method, the di...
A simple and practical rectangular transform and the vector quantization technique are described. A method for image data compression by combining the rectangular transform with vector quantization technique is presented. By using this method, the di...
1990, 12(1): 7-13.
Abstract:
Interval and recency rank coding, which are invented by Elias, are good adaptive source coding schemes for independent source. The upper bound of coding efficiency of the two schemes is shown to be that of probability rank coding, and the concept of ...
Interval and recency rank coding, which are invented by Elias, are good adaptive source coding schemes for independent source. The upper bound of coding efficiency of the two schemes is shown to be that of probability rank coding, and the concept of ...
1990, 12(1): 14-21.
Abstract:
It is well known that 1IR filters require very few computations, comonred with FIR filters, in order to meet stringent magnitude specifications when the phase distortion can be tolerated. An approximately linear phase, however, can be also obtained w...
It is well known that 1IR filters require very few computations, comonred with FIR filters, in order to meet stringent magnitude specifications when the phase distortion can be tolerated. An approximately linear phase, however, can be also obtained w...
1990, 12(1): 22-31.
Abstract:
An automatic tuning low frequency LC low-pass notch filter is developed. The generalized immittance converter (GIC) is used as a tunable inductor.The notch frequency of the filter can track the control frequency (the frequency of power supply or inte...
An automatic tuning low frequency LC low-pass notch filter is developed. The generalized immittance converter (GIC) is used as a tunable inductor.The notch frequency of the filter can track the control frequency (the frequency of power supply or inte...
1990, 12(1): 32-37.
Abstract:
A uniform GTD formula for the TM plane wave diffraction by a perfect conducting wedge loaled with an impedance surface on the illuminated side is given. This formula is used to compute the back-scattered RCS of some rectangular flat plates coated wit...
A uniform GTD formula for the TM plane wave diffraction by a perfect conducting wedge loaled with an impedance surface on the illuminated side is given. This formula is used to compute the back-scattered RCS of some rectangular flat plates coated wit...
1990, 12(1): 38-46.
Abstract:
By searching the inverse transformation of the conformal mapping combined with the method of the graphical approximation, a more effective approach is presented for the analysis of many transmission lines. This method is expounded with an example of ...
By searching the inverse transformation of the conformal mapping combined with the method of the graphical approximation, a more effective approach is presented for the analysis of many transmission lines. This method is expounded with an example of ...
1990, 12(1): 47-56.
Abstract:
Analytical expressions are given for computing the magnetic potential and characteristic functions produced by non-radial deflectors. These expressions are useful for designing the deflectors such as used in the color picture tubes and the electron b...
Analytical expressions are given for computing the magnetic potential and characteristic functions produced by non-radial deflectors. These expressions are useful for designing the deflectors such as used in the color picture tubes and the electron b...
1990, 12(1): 57-64.
Abstract:
A new phenomenological model for fitting the illuminated I-V curves of a-Si:H PIN solar cells is proposed, in which the relation between photocurrent and applied bias voltage is used. The I-V curve of the a-Si:H PIN solar cells were measured and anal...
A new phenomenological model for fitting the illuminated I-V curves of a-Si:H PIN solar cells is proposed, in which the relation between photocurrent and applied bias voltage is used. The I-V curve of the a-Si:H PIN solar cells were measured and anal...
1990, 12(1): 65-68.
Abstract:
A sixteen tree method of data compressing of bilevel image is described. This method has high efficiency, and no information loss during compression; and it is easy to realize.
A sixteen tree method of data compressing of bilevel image is described. This method has high efficiency, and no information loss during compression; and it is easy to realize.
1990, 12(1): 69-73.
Abstract:
An efficient method for the optimization of linear network is presented. The computation cost in circuit optimization mainly depends on the simulation of network. In general, the simulation of a linear network needs to solve high dimension linear equ...
An efficient method for the optimization of linear network is presented. The computation cost in circuit optimization mainly depends on the simulation of network. In general, the simulation of a linear network needs to solve high dimension linear equ...
1990, 12(1): 74-79.
Abstract:
Based on the second kind of Green s identity, a boundary integral equation for arbitrary cross-section waveguide is transformed to a system of linear homogeneous algebraic tquations by means of expansion of boundary bases and using the eigenfuncuons ...
Based on the second kind of Green s identity, a boundary integral equation for arbitrary cross-section waveguide is transformed to a system of linear homogeneous algebraic tquations by means of expansion of boundary bases and using the eigenfuncuons ...
1990, 12(1): 80-82.
Abstract:
A frequency tripler covering 210-270 GHz frequency band with a peak efficiency of 5.8% is lescribed. The maximum output power occurs at input power of 30-50 mW. The frequency tripler consists of an input waveguide WR-12, an output waveguide WR-4 and ...
A frequency tripler covering 210-270 GHz frequency band with a peak efficiency of 5.8% is lescribed. The maximum output power occurs at input power of 30-50 mW. The frequency tripler consists of an input waveguide WR-12, an output waveguide WR-4 and ...
1990, 12(1): 83-88.
Abstract:
A new method of analysing the high-frequency behaviour of the deflection system of oscillotrons is described. By analysing the tr ansit-time-different model of the deflection system of oscillotrons under unit-step function voltage, either the sweep t...
A new method of analysing the high-frequency behaviour of the deflection system of oscillotrons is described. By analysing the tr ansit-time-different model of the deflection system of oscillotrons under unit-step function voltage, either the sweep t...
1990, 12(1): 89-92.
Abstract:
The expression for the optimum output electrode depth of MCP is given. At optmum operation of MCP, the energy distribution curve of the output electron (EDOE) only shows a low energy sharp main peak, its FWHM is reduced to lower limit, and MCP can op...
The expression for the optimum output electrode depth of MCP is given. At optmum operation of MCP, the energy distribution curve of the output electron (EDOE) only shows a low energy sharp main peak, its FWHM is reduced to lower limit, and MCP can op...
1990, 12(1): 93-99.
Abstract:
Fine low dimensional modulated fringes (FLDMF) by named in GaAs/ AlxGa1-xAs multilayer heterostructures using transmission electron microscopy (TEM) have been observed. Philips EM400ST and JEOL EM4000EX were used in this work. The FLDMF with equal wi...
Fine low dimensional modulated fringes (FLDMF) by named in GaAs/ AlxGa1-xAs multilayer heterostructures using transmission electron microscopy (TEM) have been observed. Philips EM400ST and JEOL EM4000EX were used in this work. The FLDMF with equal wi...
1990, 12(1): 100-102.
Abstract:
Depletion Model Selective doped heterojunction transistor is designed and fabricated. Epitaxial modulation loping material were grown by a home-made MBE system. The gate length and width for low noise depletion devices were 1.2-1.5m and 2180m respeci...
Depletion Model Selective doped heterojunction transistor is designed and fabricated. Epitaxial modulation loping material were grown by a home-made MBE system. The gate length and width for low noise depletion devices were 1.2-1.5m and 2180m respeci...
1990, 12(1): 103-108.
Abstract:
The investigations of carbon films which are coated on Mo and Hf by using RF sputtering method are presented, including the preparation of carbon films, analysis of the composition of them, their secondary emission and thermal radiation properties an...
The investigations of carbon films which are coated on Mo and Hf by using RF sputtering method are presented, including the preparation of carbon films, analysis of the composition of them, their secondary emission and thermal radiation properties an...
1990, 12(1): 109-112.
Abstract:
A metal-oxide secondary emission film can be deposited on glass, ceramic or semiconductor substrates by thermal decomposition of an organo-metal alkoxide. For instance, MgO (or Al2O3) secondary emission film can be obtained from magnesium (or Alumini...
A metal-oxide secondary emission film can be deposited on glass, ceramic or semiconductor substrates by thermal decomposition of an organo-metal alkoxide. For instance, MgO (or Al2O3) secondary emission film can be obtained from magnesium (or Alumini...
