Taizo Kojima

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Signal design methods for the approximately synchronized CDMA systems based on complete complementary codes have been proposed. It has been shown that both the information transmission rate and the frequency usage rate can be increased by these kinds of CDMA systems. However, there are two big problems, that is, the small cell capacity and the large signal(More)
A digital system software simulator can provide high level support for testing and debugging of firmware using graphical user interfaces which perform visualization of the hardware model. Since sufficient knowledge of the target hardware is required for the development of a simulator, a simulator is usually developed by a hardware engineer, even though the(More)
In recent years, enjoying multimedia contents with portable devices become popular. These multimedia processing workloads are too heavy workload for a conventional processor so that current portable devices implement additional dedicated processor for multimedia processing. But we have to left conventional processor to execute OS and miscellaneous(More)
This paper describes the automatic generation of system descriptions for SCADA (Supervisory Control And Data Acquisition) systems. The proposed method produces various types of data and programs for SCADA systems from equipment definitions using conversion rules. This method can be used with various SCADA systems, and provides visual editing tools for(More)
Reinforcement learning (RL) is a kind of machine learning. It aims to adapt an agent to a given environment by utilizing a reward and a penalty. We know the penalty avoiding rational policy making algorithm (PARP) and the penalty avoiding profit sharing (PAPS) as examples of RL systems that are able to suppress a penalty and learn a rational policy. However(More)
For the purpose of the specification and operation level simulations of hardware, hardware description language Alhard (Application-oriented Language for HARDware simulation) was designed, and its simulation system was developed. Alhard language is an application-oriented language to be used for generation of simulators, and is designed by expanding C(More)
A convoluted-time and code division multiple access (CT-CDMA) communication system based on complete complementary codes has been proposed. There are some variations in setting some parameters for this communication system. In this study, we generalize the parameter settings for this communication system, and evaluate the constraints where the information(More)
Some signal design methods for the approximately synchronized CDMA systems based on complete complementary codes have been proposed. It has been shown that estimating the multipath channels and applying the convolution of the spread-time signals can increase both the information transmission rate and the frequency usage rate. It is also pointed out that the(More)
The purpose of this research is to provide a system framework that enables users to interact with systems by icons, using cellular phones as user interface devices. The response of the interaction of the system must be quick enough to satisfy users under such limitations as data transmission speed and performance. This work describes an application(More)
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