Convolutional encoder state estimation

To estimate the convolutional encoder state from received data, one may use the inverse to the encoder G. However, channel errors make this method unreliable. We propose a method that uses the received data in the following way. We calculate the syndrome, and after a specific number of received syndrome values equal to zero, we expect that the corresponding received data is also error-free. The received data is then used to build the inverse and give an estimate for the encoder state. The method can be used in situations where knowledge of the encoder state helps the decoding process or for synchronization purposes. We analyze the performance of the described method with respect to state estimation error probability and the average time it takes before we can estimate the encoder state with a certain desired reliability     

Throughput improvement scheme in multi-code CDMA

In multi-code CDMA, there is no self-interference among the sub-codes of a single user. By taking advantage of this property, the authors propose a new scheduling scheme to improve throughput, and derive the system throughputs of two cases with the proposed scheme applied and not applied. Analysis results show that the proposed scheme considerably improves the system throughput     

一种多晶硅高温压力传感器

制作压力传感器时，在二氧化硅层上淀积多晶硅膜，既可利用优良的机械特性，又可保证压敏电阻与衬底间具有良好的绝缘性，由此可大大提高器件的温度特性。介绍了一种多晶硅压力传感器的原理和设计。实验结果表明，这类传感器具有灵敏度好，精度高等特点，电路工作范围为０－２５０℃，且具有良好的温度稳定性。     

双原子系统中原子非经典特性与光场非经典特性的关联

本文研究了双原子与双模光场相互作用系统中，双原子分崩离析有压缩与双模光场二阶压缩间的对称关系。揭示了原子间关系和光场模间关联的转换特性，并探讨了失谐量，耦和常数对原子非经典特性与光场非经典特性间关联的影响。     

SPRITE探测器的电阻问题

ＳＰＲＩＴＥ探测器的电阻是一个重要的器件参数。研究了Ｈｇ１－ｘＣｄｘＴｅ材料组分和电阻率、芯片厚度和表面电导等因素对该电阻的影响，并就实验数据进行了比较结果表明：ＳＰＲＩＴＥ器件的室温电阻主要是受Ｈｇ１－ｘＣｄｘＴｅ材料组份和芯片厚度的影响。而其液氮温度电阻则主要是受芯片表面电导的影响。     

Optimal burn-in for minimizing cost and multiobjectives

In general, a small proportion of components will be weak because of some imperfection in the control of the production process or in the design of the components. This paper discusses an optimal burn-in procedure to minimize total costs based on the assumption that some of the components are weak and deteriorate faster than the strong components. The procedure will define the costs of burn-in errors. In practice, it may be impossible to eliminate all weak components through burn-in due to a nonzero proportion of defectives of the components. Therefore, burn-in errors could occur for some reasons. Probability models and cost models are formulated to find the optimal burn-in time that minimizes the expected total cost. An example is included to show how to use the results. Finally, multiobjective optimal burn-in for series systems is presented using the surrogate worth trade-off method.     

The Performances of the Antennas in Active/Passive Compounded Guidance Part II: Compounded Antennas Schemes and Performances of Active/Passive Guidance

The second part of a two-part paper discusses two kinds common-caliber compound antennas techniques for active/passive guiding system. One is the triple-antenna compound technique which two spiral antennas are utilized to find the direction of a radiative source in passive amplitude-phase monopulse subsystem and the other is used in pulse-radar. The next is the double-antenna technique which one antenna is for passive amplitude-monopulse direction-finding and the another is for pulse-radar. The mutual influence among these antennas is analysed in details and the better one in the scheme is pointed out finally in this paper.     

The Evolution of Korean Information Infrastructure and Its Future Direction: A System Dynamics Model

The recent technological and industrial revolution dictates a new approach in constructing Korean Information Infrastructure. Lacking past data on the newly emerging markets, econometrics methodologies cannot accurately forecast future paths of advanced networks, let alone dynamic impacts of public policies. In this paper, we have built a system dynamics model of the Korean Information Infrastructure and simulated diverse policy measures including market integration and government initiative in investment for experimenting their effectiveness. The most counterintuitive result of our research is that the market integration policy will facilitate CATV networks at an early stage until the year 2010, but will result in a diminished market size in the long run. With the system dynamics approach, we can enhance our understanding of the complex policy systems and get valuable insights through learning by modeling and simulation.     

Performance Analysis of the UPC/NPC Algorithm for Guaranteed QoS in ATM Networks

It is well known that if usage parameter control/network parameter control (UPC/NPC) functions are used together with a cell loss priority control scheme in ATM networks, the measurement phasing problem can occur. This makes it difficult for a network provider to define and commit the cell loss ratio as a QoS parameter. To solve the problem, we propose a new UPC/NPC algorithm. By using the proposed UPC/NPC algorithm, we can define the cell loss ratios for CLP = 0 and CLP = 0+1 cell streams without the measurement phasing problem under any conditions. We analyzed the performance of the proposed UPC/NPC algorithm. Using a discrete time model for the UPC/NPC architecture with a discrete-time semi-Markov process (DSMP) input model, we obtained the cell discarding probabilities of CLP = 0 and CLP = 0+1 cell streams and showed that more CLP = 0 cells are accepted compared to what was proposed in ITU-T.     

Image compression through projection of wavelet coefficients

This paper proposes an image compression algorithm that adopts projection scheme on wavelet transform domain of image signal. Wavelet-decomposed image is encoded by the result of projection along one direction out of eight which approximates the coefficients most closely to the originally transformed coefficients. These projection data are vector-quantized using separate codebooks depending on the decomposition level and orientation of decomposed image. Experimental result reveals that proposed scheme shows excellent performance in PSNR manner and also shows good subjective quality.