Faculty Profiles - YAMAUCHI Toshihiro

MISC - YAMAUCHI Toshihiro

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Evaluation of a Buffer Cache Mechanism for Homepage Contents

KOTOGE Miyuki, TABATA Toshihiro, TANIGUCHI Hideo

IPSJ SIG Notes 106 ( 83(OS-106) ) 95 - 102 2007.8

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

Web site contains various contents. It also has an entrance page of the web site. Many internet users tend to browse the various contents from the entrance page. Therefore, it is important to shorten the access response time of the entrance page for web service. To meet this requirement, we proposed a buffer cache control method that stores files of specific directories in buffer cache on a web server. We focused attention on that the web server stores similar types of files for a same directory. In this paper, we describe the buffer cache control method, and evaluate access response time at each entrance page of department of Okayama University with our method. From the result of this e valuation, we show effectiveness of our method.

A Design and Evaluation of Filtering Method of Image Spam in Bayesian Filter

UEMURA MASAHIRO, TABATA TOSHIHIRO

IPSJ SIG Notes 38 ( 71 ) 311 - 318 2007.7

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

In late years, with the spread of Internet, increase of an unwanted e-mail becomes a problem. In 2006, there is a finding that spam-mail is occupied 91% of the whole E-mail. A Bayesian filter filtering statistically with Bayes theory as an anti-unwanted e-mail measure is used widely. The filter has high precision of filtering and is able to match with the trend of an unwanted e-mail and personal preference as the characteristic. However, the image spam that does imaging of contents of an unwanted e-mail increases rapidly as the end run. Baysian filter is not able to do an appropriate learning and judgement for binary data such as images since Bayesian filter learns and judges for only text data. Therefore, in this paper, we pay attention to information, such as file size of an attached image and suggest a technique of filtering with adding these information to a corpus of existing Bayesian filter as an anti-image spam measure. In addition, we report the evaluation result.

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A Design and Evaluation of Filtering Method of Image Spam in Bayesian Filter

UEMURA MASAHIRO, TABATA TOSHIHIRO

IEICE technical report 107 ( 141 ) 103 - 110 2007.7

Language：Japanese Publisher：The Institute of Electronics, Information and Communication Engineers

Mechanism of Information Gathering and Display for Visualization of Operating System Behavior in Tender

KINOSHITA Akira, KAWAHARA Taisuke, TABATA Toshihiro, TANIGUCHI Hideo

IPSJ SIG Notes 105 ( 36(OS-105) ) 31 - 38 2007.4

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

It is difficult to grasp the behavior situation of software, because a scale of software grows. In addition, it is hard work to understand the flow of complicated software such as OSs. Although the visualization of OS behavior has been developed, it is difficult to grasp the flow of internal processing of OS including interrupts and exceptions. In this paper, we describe the mechanism of the visualization of OS behavior including interrupts in Tender. In Tender, the information of the flow of internal processing of OS can be gathered by adopting the program structure, and the mechanism of visualization can be achieved at OS level by considering the processing type of interrupt and so on. Employing this mechanism, the information of the visualization of OS behavior can be used for studying OSs and for supporting program developments. We describe the mechanism of display and the visualization of the process scheduling as an example of OS behavior to study.

Speed-up of fork & exec System-call by Recycling Resource on Tender

SAEKI Kenji, TABATA Toshihiro, TANIGUCHI Hideo

IPSJ SIG Notes 105 ( 36(OS-105) ) 23 - 30 2007.4

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

The cost of process creation is high in the processing of OS. The costs degrade the performance of program execution. To solve this problem, we have implemented fast process creation and disappearance by recycling process resource in Tender. Tender has BSD/OS interface for program execution of the BSD/OS. In this paper, we describe the method of speed-up of fork and exec system-call by recycling resource in Tender, and evaluate fork and exec system-call by recycling each resource. Moreover, we report the effect of recycling resource by using Apache web server.

Process creation mechanism for AnT

NISHINA Tadato, NOMURA Yusuke, TABATA Toshihiro, NOMURA Yoshinari, TANIGUCHI Hideo

IPSJ SIG Notes 105 ( 36(OS-105) ) 7 - 14 2007.4

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

AnT is an operating system based on micro-kernel architecture. Filesystem, device driver and other operating system modules run as a process named external-core. AnT can adapt various kind of computer environment by changing set of external-core. In this paper, we present process creation mechanism for AnT to make AnT adapt computer environment and create process need by AnT. And we present efficient mechanism of process control.

D-3-7 Startup of Device Driver Process by I/O Request for AnT

Nishina Tadato, Nomura Yusuke, Tabata Toshihiro, Taniguchi Hideo

Proceedings of the IEICE General Conference 2007 ( 1 ) 22 - 22 2007.3

Tender上のWebサーバにおける資源再利用機能の効果

佐伯顕治, 田端利宏, 谷口秀夫

第69回全国大会講演論文集 2007 ( 1 ) 35 - 36 2007.3

ドライバプログラムの効率的な構成制御法

滝口真一, 田端利宏, 乃村能成, 谷口秀夫

第69回全国大会講演論文集 2007 ( 1 ) 27 - 28 2007.3

AnT におけるNICドライバプロセスの実現

岡本幸大, 乃村能成, 田端利宏, 谷口秀夫

第69回全国大会講演論文集 2007 ( 1 ) 29 - 30 2007.3

Proposal of a Persistent Mechanism for Computer Processing by Non-volatilizing Data on Virtual Memory Space

OHMOTO TAKUMI, TABATA TOSHIHIRO, TANIGUCHI HIDEO

IPSJ SIG Notes 104 ( 10(OS-104) ) 25 - 32 2007.1

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

Data on main memory is no longer available when a computer is turned off, because volatile memory is used for main memory. Therefore, a computer cannot continue processing before the shutdown. In order to solve this problem, users use a file function or hibernation function. However, users have to specify I/O operations between main memory and external storage. As the result, these functions cannot deal with an urgent stop of a computer. Thus, we propose a persistent data management on virtual memory space. We call this mechanism "plate" function. In this paper, we explain persistent mechanism for computer processing using plate. This mechanism regularly stores data which are managed by plate. Thus, using this mechanism, the loss of processing can be reduced.

Design and Implementation of Memory Management for AnT Operating System

UMEMOTO MASANORI, TABATA TOSHIHIRO, NOMURA YOSHINARI, TANIGUCHI HIDEO

IPSJ SIG Notes 104 ( 10(OS-104) ) 33 - 40 2007.1

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

AnT is an operating system based on micro-kernel architecture. Therefore, AnT can provide various kinds of service. However, there is a problem about a data transferring overhead caused by a lot of inter-process communications. Therefore, we need to examine memory management so that AnT can transfer data with low overhead. In this paper, we present design, implementation and evaluation of memory management. Resulting from the design and the implementation, AnT can realize memory protection from each program, high speed inter-process communication and high speed rebooting. We evaluate data transferring and rebooting.

Evaluation of File Access Permissions that Integrate Access Vector Permissions

山口拓人, 中村雄一, 田端利宏

情報処理学会シンポジウム論文集 2007 ( 10 ) 2007

An Evaluation of Performance of Security Focused OS by Measuring the Overhead of LSM

松田直人, 田端利宏, 宗藤誠治

情報処理学会シンポジウム論文集 2007 ( 10 ) 2007

B_036 Evaluation of Directory Oriented Buffer Cache Mechanism

Kotoge Miyuki, Saitou Kei, Tabata Toshiihro, Nomura Yoshinari, Taniguchi Hideo

5 ( 1 ) 147 - 148 2006.8

B_038 Proposal of Fast Cryptographic File System by Using Delayed Write

Matsuda Naoto, Tabata Toshiihro

5 ( 1 ) 151 - 152 2006.8

B_028 Basic Function of Save and Restore a Process Context on Tender

Nanba Hiroki, Tabata Toshihiro, Taniguchi Hideo

5 ( 1 ) 131 - 132 2006.8

B_030 Realization of High Speed Inter-process Communication for AnT

Umemoto Masanori, Tabata Toshihiro, Nomura Yoshinari, Taniguchi Hideo

5 ( 1 ) 135 - 136 2006.8

Design for AnT Operating System

TANIGUCHI Hideo, NOMURA Yoshinari, TABATA Toshihiro, ADACHI Toshimitsu, NOMURA Yusuke, UMEMOTO Masanori, NISINA Tadato

IPSJ SIG Notes 103 ( 86(OS-103) ) 71 - 78 2006.8

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

There is a remarkable thing for progress of a microprocessor and input-output hardware. Furthermore, improvement of transmission speed of a channel is remarkable, too. In addition, a computer is necessary in various scenes, and service classification to offer increases drastically. It is demanded that base software can use a function and performance of these hardware effectively. Therefore it was started development the AnT operating system (An operating system with adaptability and toughness) to have both adaptability and solidity. This article explains a design policy of the AnT operating system and a characteristic function.

Evaluation of Heterogeneous Virtual Storage (HVS)

TABATA TOSHIHIRO, TANIGUCHI HIDEO

IPSJ SIG Notes 102 ( 44(OS-102) ) 29 - 36 2006.5

Language：Japanese Publisher：Information Processing Society of Japan (IPSJ)

We have proposed Heterogeneous Virtual Storage (HVS) that is integrated both single virtual storage and multiple virtual storage. HVS has multiple virtual storage spaces. The number of processes on a virtual storage space is more than zero. Besides, a process can migrate between virtual storage spaces. Therefore, HVS has both single virtual storage's advantages and multiple virtual storage's advantages. In this paper, we report the evaluation of basic functions in OS in order to make clear the application of HVS functions. In addition, we implemented some functions in Apache Web server in order to use the functions of HVS, and describe the performance of Apache.

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