Variation of bifurcation diagram of difference equation, X (t1) AX (t)(1X (t) BX (t1) ), investigated as a function of B. Several bifurcation patterns appear with B, such as logistic model like pattern, period-3, period-4 and oscillatory pattern.

We present comparative analysis of average behavior based on path length for hierarchical routing schemes. The analyzed schemes are K-scheme (by Kamoun et al.), G-scheme (by Garcia et al.), and I-scheme (by the authors). The analysis is performed by simulation experiments. The results show that I-scheme is superior to both K- and G-schemes, and that K-scheme is better than G-scheme with respect to path length. Additionally, a path length obtained by I-scheme is about 20% longer than the optimal one on the average.

Parameters of impulsive interference on power line were derived by fitting the observed noise to calculated exceedance probabilities of the envelope. Middleton's class A or B model may be applied to the interference that noise sources are Poissonian distributed on power line and appeared randomly in time. For the periodic and pulsive interference, a simple model is valid.

The novel switched-capacitor frequency-to-voltage converter without employing active component is proposed. Therefore, it is free from non-ideal factors of active components, such as offset voltage or open loop gain of op-amps.

A disparity detection method with coarse-to-fine strategy using trinocular stereo images is presented. The method employs zero-crossings of the Laplacian of Gaussian filtered images in multiple resolutions as features to make correspondence. An experiment has shown a good result for zero-crossings having an intense gradient.

On the basis of the relation between the multichannel prediction model and the 2-D prediction model, the convergence properties of prediction error covariance, prediction coefficients and corresponding 2-D polynomials of the latter model are derived from the known convergence properties of those of the former model. Furthermore, the formulas of the convergence order of the 2-D prediction model are obtained by using the knowledge of the convergence order of 2-D correlation sequence {γ_i,j}.

A new class of active circuits for realization of all-pole low-pass characteristics is proposed. The proposed circuit simulates the doubly terminated ladder filters realized by lossless inductors and lossy capacitors. The number of required operational amplifiers is about two thirds that of the conventional leapfrog realization. First, the synthesis method of an LC ladder filter with lossy capacitors is described. Second, the relations between the voltage and the current of the above-mentioned LC filter are derived and circuits for realizing these relations and a method for synthesizing an odd-order filter are shown. Finally, a fifth-order low-pass filter is designed and it is shown that the measured response shows a good agreement with the theoretical value. Furthermore, the element sensitivity is estimated by a computer and it is shown that the sensitivity of the proposed circuit is lower than that of the conventional leapfrog circuit.

This paper develops a closed form approximation method for the mean performance measures in a single-server priority queue with batch arrivals of two classes. The batch arrivals queueing model considered here is an extension of the previously analyzed models and it has a potential applicability in packet communication systems. The interarrival time of batches, batch size (the number of customers) and service time of customers are assumed to have a general distribution for each priority class. The head-of-the-line (HL) and preemptive-resume (PR) rules are considered. Qualitative characterization results are presented through a flow-balance argument. Especially, important relationships between the mean performance measures are derived, which enable us to make an approximation. Using a diffusion approximation for the unfinished work and its refinement, and using the qualitative results, new approximate formulas for the mean performance measures, e.g., mean delay time of each priority class are obtained. Some numerical examples are provided and compared with exact and simulation results, confirming the accuracy of the approximation. The proposed approximate formulas are shown to be exact if the arrival streams for both classes are batch Poisson processes.

The theory of finite fields has been successfully applied to the constructing of the various algebraic codes, digital signal processing, and techniques of cryptography. Especially the theories on four operations are very important, because it is strongly related to the size and the throughput of the gate circuits for the various encoders and decoders. In this paper we shall give a new method for constructing the gate circuit that yields the multiplicative inverses over GF (2^m). The method is based on a new algorithm for computing multiplicative inverses in GF (2^m). The operations needed for our algorithm are rarely performed on GF (2^m), but primarily on the subfields of GF (2^m). When performing the multiplication and division over finite fields, the idea of using the subfield has been given wide attention. However the conventional algorithms taking advantage of this idea are not necessarily efficient from the practical point of view. We see that our algorithm proved superior to the conventional methods when GF (2^m) has the subfield GF (2²).

This paper presents busy/idle signal" scheme for control channel in mobile satellite communication systems. In the design of channel access schemes in mobile satellite communication systems, the following three factors must be taken into account: (1) a control channel is shared by call setup signals and response signals, (2) differences in propagation delays occur depending on the distance between the satellite and the mobile stations, (3) the number of retransmissions of a call setup signal is limited. Traffic performance measures of the proposed channel access scheme, such as throughput, mean setup delay and mean response delay, are compared with those of the random access scheme and the framed access scheme. A numerical method is presented for obtaining these measures, and the method's accuracy is demonstrated by comparing results with those obtained by simulation. This numerical method is very simple and is applicable to channel access schemes for mobile satellite communication systems with the above three factors. Using the numerical method, the proposed scheme is shown to be superior to other schemes.

Photonic switching and coherent optical transmission would be key technologies for realizing future all optical broadband wide-area networks. This paper reports results of studies on integrating photonic switching systems and coherent optical transmission technologies. Introducing coherent optical transmission technologies to photonic space-division switching systems will lead to some excellent features, including line handling capacity expansion, transmission span increase and integration capability with coherent WDM/FDM broadcasting systems. Photonic wavelength-division (WD) switching systems with large number of WD channels would also be possible, with coherent optical transmission technologies. Space-division switching experiments in a 100 Mb/s optical FSK transmission system were carried out using LiNbO₃ photonic switch matrices. Receiver sensitivity improvement of 7.5 dB was observed in the transmission experiments through a photonic switch matrix and long SMFs (22 km, 100 km). This allows more cascaded connection for photonic switch matrices in a photonic switching system. It was also shown that crosstalk component can be rejected at the receiver by introducing channel separation greater than 3 GHz, even when the crosstalk power is ten times larger than the desired signal. From these experimental results, a photonic SD switching system whose line capacity exceeding 500-lines and whose transmission line length was over 20 km, would be expected.

This paper describes the induction heating system designs for spliced fiber reinforcement and the reinforcement performances. In the case of the reinforcement method using hot-melt adhesive, it is necessary to give the reinforcing assembly the precise temperature distribution. For this reason, the power transfer efficiency from the power source to the work object of the reinforcing assembly was investigated under practical induction heating conditions. Furthermore, the effect of each coil of the induction coils on the magnetic intensity generated in the part of the work object opposite the induction coils was examined. The transient temperature distribution of the work object could be obtained through simulation by designing the proper numbers of turns of wire, the setting positions of the induction coils and the dimension of electric power at a power source. The simulation results agreed approximately with the measured temperatures of the work objects. Through the proper thermal designs, the sandwich and heat-shrinkable-sleeve reinforcements were completed within 1 min., 30 sec. with good performances by supplying less than 26, 12-W of electric powers, respectively.