Professor Dr. Yutaka TAKAHASHI - a researcher of Information Technology and computer simulation methods and their application

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<div class='header' macro='gradient vert [[ColorPalette::PrimaryLight]] [[ColorPalette::PrimaryMid]]'>
<div class='headerShadow'>
<span class='siteTitle' refresh='content' tiddler='SiteTitle'></span>&nbsp;
<span class='siteSubtitle' refresh='content' tiddler='SiteSubtitle'></span>
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<span class='siteTitle' refresh='content' tiddler='SiteTitle'></span>&nbsp;
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<div class='title' macro='view title'></div>
<div class='subtitle'><span macro='view modifier link'></span>, <span macro='view modified date'></span> (<span macro='message views.wikified.createdPrompt'></span> <span macro='view created date'></span>)</div>
<div class='tagging' macro='tagging'></div>
<div class='tagged' macro='tags'></div>
<div class='viewer' macro='view text wikified'></div>
<div class='tagClear'></div>
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<div class='editor' macro='edit title'></div>
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<div class='editor' macro='edit text'></div>
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To get started with this blank TiddlyWiki, you'll need to modify the following tiddlers:
* SiteTitle & SiteSubtitle: The title and subtitle of the site, as shown above (after saving, they will also appear in the browser title bar)
* MainMenu: The menu (usually on the left)
* DefaultTiddlers: Contains the names of the tiddlers that you want to appear when the TiddlyWiki is opened
You'll also need to enter your username for signing your edits: <<option txtUserName>>

These InterfaceOptions for customising TiddlyWiki are saved in your browser

Your username for signing your edits. Write it as a WikiWord (eg JoeBloggs)

<<option txtUserName>>
<<option chkSaveBackups>> SaveBackups
<<option chkAutoSave>> AutoSave
<<option chkRegExpSearch>> RegExpSearch
<<option chkCaseSensitiveSearch>> CaseSensitiveSearch
<<option chkAnimate>> EnableAnimations

----
Also see AdvancedOptions

<<importTiddlers>>

[[System Dynamics Society|http://www.systemdynamics.org/]]
*April 2006-March 2008 Liaison of Japan Chapter
[[International Systems Science Society|http://www.isss.org/]]
[[Japan Society of Management Information|http://www.jasmin.jp/en/home/index.html]]
[[Japan Society of Business Mathematics|http://www.isc.senshu-u.ac.jp/~thc0417/jbm/eindex.htm]]
*June 1997-May 2001 Secretary
*June 2001-May 2003 Controller
*June 2005-May 2009 Director
[[Information Processing Society of Japan|http://www.ipsj.or.jp/english/index.html]]
[[Operations Research Society of Japan|http://www.orsj.or.jp/english/index.html]]
[[Japan Society for Information and Management|http://wwwsoc.nii.ac.jp/oa/]]

It is the best way to use Internet email when you contact me.
My email address is takahasi[at-mark]isc.senshu-u.ac.jp.
Note: in order to eliminate spam mails, this page indicate [at-mark] instead of "@."
It is necessary to substitute [at-mark] with "@" when you send an email to me.)

I always try to reply as soon as possible.If you have not received my reply to your email, please let me know.

/***
|''Name:''|CryptoFunctionsPlugin|
|''Description:''|Support for cryptographic functions|
***/
//{{{
if(!version.extensions.CryptoFunctionsPlugin) {
version.extensions.CryptoFunctionsPlugin = {installed:true};

//--
//-- Crypto functions and associated conversion routines
//--

// Crypto "namespace"
function Crypto() {}

// Convert a string to an array of big-endian 32-bit words
Crypto.strToBe32s = function(str)
{
	var be = Array();
	var len = Math.floor(str.length/4);
	var i, j;
	for(i=0, j=0; i<len; i++, j+=4) {
		be[i] = ((str.charCodeAt(j)&0xff) << 24)|((str.charCodeAt(j+1)&0xff) << 16)|((str.charCodeAt(j+2)&0xff) << 8)|(str.charCodeAt(j+3)&0xff);
	}
	while (j<str.length) {
		be[j>>2] |= (str.charCodeAt(j)&0xff)<<(24-(j*8)%32);
		j++;
	}
	return be;
};

// Convert an array of big-endian 32-bit words to a string
Crypto.be32sToStr = function(be)
{
	var str = "";
	for(var i=0;i<be.length*32;i+=8)
		str += String.fromCharCode((be[i>>5]>>>(24-i%32)) & 0xff);
	return str;
};

// Convert an array of big-endian 32-bit words to a hex string
Crypto.be32sToHex = function(be)
{
	var hex = "0123456789ABCDEF";
	var str = "";
	for(var i=0;i<be.length*4;i++)
		str += hex.charAt((be[i>>2]>>((3-i%4)*8+4))&0xF) + hex.charAt((be[i>>2]>>((3-i%4)*8))&0xF);
	return str;
};

// Return, in hex, the SHA-1 hash of a string
Crypto.hexSha1Str = function(str)
{
	return Crypto.be32sToHex(Crypto.sha1Str(str));
};

// Return the SHA-1 hash of a string
Crypto.sha1Str = function(str)
{
	return Crypto.sha1(Crypto.strToBe32s(str),str.length);
};

// Calculate the SHA-1 hash of an array of blen bytes of big-endian 32-bit words
Crypto.sha1 = function(x,blen)
{
	// Add 32-bit integers, wrapping at 32 bits
	add32 = function(a,b)
	{
		var lsw = (a&0xFFFF)+(b&0xFFFF);
		var msw = (a>>16)+(b>>16)+(lsw>>16);
		return (msw<<16)|(lsw&0xFFFF);
	};
	// Add five 32-bit integers, wrapping at 32 bits
	add32x5 = function(a,b,c,d,e)
	{
		var lsw = (a&0xFFFF)+(b&0xFFFF)+(c&0xFFFF)+(d&0xFFFF)+(e&0xFFFF);
		var msw = (a>>16)+(b>>16)+(c>>16)+(d>>16)+(e>>16)+(lsw>>16);
		return (msw<<16)|(lsw&0xFFFF);
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	var k2 = 0x6ED9EBA1;
	var k3 = 0x8F1BBCDC;
	var k4 = 0xCA62C1D6;

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	var h1 = 0xEFCDAB89;
	var h2 = 0x98BADCFE;
	var h3 = 0x10325476;
	var h4 = 0xC3D2E1F0;

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		var c = h2;
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			e=d; d=c; c=(b>>>2)|(b<<30); b=a; a = t;
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		for(j=20;j<40;j++) {
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			e=d; d=c; c=(b>>>2)|(b<<30); b=a; a = t;
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		h2 = add32(h2,c);
		h3 = add32(h3,d);
		h4 = add32(h4,e);
	}
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};


}
//}}}

[[Yutaka TAKAHASHI]]

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[[Yutaka TAKAHASHI]]
[[My Research Activities]]
[[My Lectures and Seminars]]
[[Academic Societies]]
[[Contact]]

!Undergraduate School
There are lots of computer science classes and a business model simulation classby me.
Permanent classes are below:
*Introduction to Computer Science
*Computers and Software
*Programming
*Information Communication Network
*Multimedia Expression
*Business Model Simulation

Of course, I have [[My Seminar]] and students can learn the art of simulation there.

!Graduate School
In addition to [[My Seminar]], I have two lectures: Information Processing I and II.
*Information Processing I: Systems Thinking
*Information Processing II: System Dynamics (using PC)

!Other Seminars or lectures
I have several classes at universities in Japan, in addition to my Senshu University. Gakushuin University invites me this year. These classes are below:
-Management Science
-Statistics using computer
-Network

In addtion, I am frequently invited to seminars as a speaker, especially to IT, System Dynamics, or System Dynamics seminars.
If you are planning to have such seminars, please [[Contact]] me as soon as possible with your plans via email.

!Papers (Here listed only papers written in English after 2005.)
|The Importance of Balancing Knowledge Protection and Knowledge Interchange|In "Ethical Issues and Social Dilemmas in Knowledge Management: Organizational Innovation" IGI. Ed. by G. Costa. pp. 180-198, 2010|
|The importance of keeping engineers and knowledge workers inside on organisations’ performances (with N. Tanaka)|Proceedings of  The 28th International Conference of the System Dynamics Society, 2010|
|The necessity of educating appropriate communication media use and network leave|Journal of Information and Management, 30(3),pp. 99-108.|
|Dynamic simulation modelling using descriptive information in natural language|International Journal of Simulation and Process Modelling 2008 - Vol. 4, No.3/4  pp. 215 - 222|
|Improvement in the translation process from natural language to system dynamics models|Lecture Note in Business Information Processing 10: Advances in enterprise engineering I; Springer, 2008|
|Causal Loop Structure Maintaining Charity Shop Operation|2007 Conference on Systems Science, Management Science and System Dynamics|
|A Study of Cognitive Management Issues at the Business Ventures Targetting the Business in the New Field Using Causal Loop Diagram (collaboration with Y. Fukunaga et al.)|The 51st Annual Meeting of the International Society for the Systems Sciences 2007|
|Stock Flow Diagram Making with Incomplete Information about Time Properties of Variables|2006 Conference of the System Dynamics Society; the Netherlands.|
|Nomadic Beer Game on Computer Networks (collaboration with N. Tanaka et al.)|2006 Conference of the System Dynamics Society; the Netherlands.|
|Influence of Free Version upon Pay Version of High Specialty Software Diffusion|International System Dynamics Conference; 2005; Boston. |
|Translation from Natural Language to Stock Flow Diagrams|International System Dynamics Conference; 2005; Boston. |
|Some Contributions toward Spatial Urban Dynamics (collaboration with A. Uchino et al.)|International System Dynamics Conference; 2005; Boston. |
|System Dynamics Analysis of Differences between Extra Time Work and Postponement -Focused on characteristics of measures corresponding to the extra duties-|2005 Conference of System Dynamics and Management Science Sustainable Development of Asia Pacific |
|Paragraph Archetypes - An Experiment on Building Story Templates -|2005 Conference of System Dynamics and Management Science Sustainable Development of Asia Pacific |
|System Dynamics Modelling Using UML Collaboration Diagrams (collaboration with N. Tanaka et al.)|2005 Conference of System Dynamics and Management Science Sustainable Development of Asia Pacific |

In addition, I have many papers written in Japanese. 

!Books
|The Importance of Balancing Knowledge Protection and Knowledge Interchange|In "Ethical Issues and Social Dilemmas in Knowledge Management: Organizational Innovation," IGI. Ed. by G. Costa. pp. 180-198, 2010|
I have written eight books about System Dynamics and Information Processing. All they are in Japanese.
If you would like to have the title list, please [[Contact]] me via email.

!Other activities
*Supervision of STELLA Japanese version (version 5.1J), System Dynamics simulation software of &link(isee systems,http://www.iseesystems.com);.
*I am frequently invited to seminars as a speaker or teacher, especially to System Dynamics or Systems Thinking seminars.
If you are planning to have such seminars, please [[Contact]] me as soon as possible with your plans via email.

!Undergraduate school seminar

In this seminar, students concentrate on learning the basic theory of System Dynamics, how to operate System Dynamics software, and application to solutions of management field problems.

Students are requested to write long report for their academic units of this seminar.

This seminar is opend in [[Ikuta campus|http://www.acc.senshu-u.ac.jp/koho/english/intro2/campus/area_ikuta.html]].

!Graduate school seminar

Graduate students who have much interest in System Dynamics, Systems Thinking, and Information Processing can write their papers in this seminar.

This seminar is opend in [[Kanda campus|http://www.acc.senshu-u.ac.jp/koho/english/intro2/campus/area_kanda.html]].

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a researcher of Information Technology and computer simulation methods and their application

Professor Dr. Yutaka TAKAHASHI

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This site is powered by TiddlyWiki.

I am a professor at School of Commerce, [[Senshu University|http://www.senshu-u.ac.jp/koho/Welcome.html]].
My major is research about "relationship between Information Technology(IT) and society" and "the development of computer simulation methods and application of computer simulation to business, political, and environmental issues."
Currently, I am a member of public procurement surveillance committee of Ministry of Health, Labour and Welfare, Japan.
Please read [[My Research Activities]], [[My Lectures and Seminars]], [[Academic Societies]], and [[Contact]].
A "Modelling Poster" used in my System Dynamics seminar is [[here|http://www.isc.senshu-u.ac.jp/~thc0577/modellingA3Vensim.pdf]]. This poster shows how to make your own SD models including techniques to decide which variable should be stock and which pair of variables should be connected.
In order to make my make work correctly, please turn on Java Script functions.