Changhyun Kwon | Main / RecentChanges http://www.chkwon.net/rss Main.RecentChanges Mon, 13 Feb 2012 18:43:59 GMT MATLAB http://www.chkwon.net/Main/MATLAB

Table of Contents (hide)

  1. 1. Some Readings
  2. 2. MATLAB Central File Exchange
  3. 3. Recipes
    1. 3.1 Some useful expressions
    2. 3.2 How to control the number of markers in figure?

1.  Some Readings

2.  MATLAB Central File Exchange

3.  Recipes

3.1  Some useful expressions

  • Custom function
x = fminunc(@(x) myfun(x,a),x0);
  myfun = @(x) x+2+a;
  • 2D plotting of 3D data
plot([1:10], squeeze(r(1,1,:)));
  • Repeat matrix
repmat(A, [1,1,N]);
  • Setting font sizes in plots
set(0,'DefaultAxesFontSize',14)

3.2  How to control the number of markers in figure?

When the size of data is large, using markers in plot is a pain. MATLAB simply puts all the data points with markers, so the plot looks very ugly. I found that drawing three times for a data series looks stupid, but definitely works. Please see the following codes as an example:

num_data = 200;
num_marker = 10;
marker_space = num_data / num_marker;

% x data
x = linspace(0,2,num_data);

% y data
y1 = exp(x);
y2 = 5-exp(-x);

% make font size big
set(0,'DefaultAxesFontSize',14)

% draw a figure
fig1 = figure;
hold on; grid on;

% (1) these two for legend
plot1 = plot(x(1),y1(1), 'ko-','LineWidth',2);
plot2 = plot(x(1),y2(1), 'b*--','LineWidth',2);

% (2) these two for markers
plot(x(1:marker_space:num_data), y1(1:marker_space:num_data), 'ko','LineWidth',2);
plot(x(1:marker_space:num_data), y2(1:marker_space:num_data), 'b*','LineWidth',2);

% (3) these two for lines
plot(x,y1,'k','LineWidth',2);
plot(x,y2,'b--','LineWidth',2);

legend('y_1','y_2','Location','Best');
xlabel('Name of x data \gamma ');
ylabel('Name of y data');

% save the figure as a 600-dpi PDF file
save2pdf('figure_filename',fig1,600);

To save the figure as a PDF file, I recommend save2pdf. The result is:

]]>chang 2012-02-13T18:43:59Z Mon, 13 Feb 2012 18:43:59 GMT chang LaTeX http://www.chkwon.net/Main/LaTeX

Table of Contents (hide)

  1. 1. How to start LaTeX (Windows)
  2. 2. Sample Tasks to Complete for Beginners
  3. 3. Readings
    1. 3.1 TeX books
  4. 4. Links
  5. 5. Useful Tools
    1. 5.1 Graphics
  6. 6. Topics
    1. 6.1 Citation and Bibliography
    2. 6.2 Merge
    3. 6.3 Beamer
    4. 6.4 Fonts
    5. 6.5 TeXLive + ko.tex
    6. 6.6 SumatraPDF + TeXmaker inverse search setup
    7. 6.7 How to use TeX in GMail and any other website with Firefox
    8. 6.8 Installing a Spell Checker for TeXworks
    9. 6.9 CV Templates
    10. 6.10 Grammar Check

4.  How to start LaTeX (Windows)

I use TeX Live and TeXworks. However, for beginning users, MikTeX and WinEdt might be easier.

  1. Download and install MikTeX. (MikTeX is free.)
  2. Download and install WinEdt. (WinEdt is a shareware.)
  3. Read this document. (This is available for many languages; English, Korean, and so on.)
  4. Start it.

5.  Sample Tasks to Complete for Beginners

After reading the this document, you may try to complete the following tasks:

  1. Produce a final PDF file using 'pdflatex', not 'latex'.
  2. Include a PDF image file (not JPG, GIF, PNG, EPS, etc) to the document.
  3. Write a table.
  4. Learn how to manage .bib files. I recommend JabRef.
  5. Using .bib and 'bibtex', cite a reference and create a final PDF file that includes a bibliography.

There are several ways to create a final PDF file and include images. I just prefer 'pdflatex' and PDF image formats to other methods and formats.

6.  Readings

6.1  TeX books

7.  Links

8.  Useful Tools

  • JabRef- Java GUI for managing BibTeX and other bibliographies
  • Excel To LaTeX Conversion -- You can create LaTeX codes for tables from an Excel spreadsheet directly.
  • Detexify -- Drawing a symbol will give you the LaTeX code for it.
  • SumatraPDF for TeX users -- This lightweight PDF viewer allows updating the document without closing/reloading, and allows inverse search.
  • HeVeA - A good HTML translator for LaTeX.
  • TeX4ht - The best HTML translator for LaTeX that I know of. The HTML version of my CV is created by the htlatex command of TeX4ht.

8.1  Graphics

  • VectorMagic - Vectorize your image
  • LaTeXPiX
  • Inkscape - This is an open source alternative to Adobe Illustrator. Inkscape can export drawings as LaTeX codes (save as PDF).
    • textext - An Inkscape extension to enter LaTeX equations in Inkscape
  • ImageMagick - command-line based image manipulation tool; especially useful for converting image formats
mogrify -format jpg *.png
convert filename.jpg filename.png

9.  Topics

9.1  Citation and Bibliography

9.2  Merge

  • LINK {ko} - PDFMerge
  • LINK {ko} - combine package

9.3  Beamer

Beamer is to generate presentation slides.

9.4  Fonts

\usepackage[T1]{fontenc}
\usepackage[scaled]{uarial}
\renewcommand*\familydefault{\sfdefault}
  • Times Roman
\usepackage{mathptmx}
  • Palatino
\usepackage{mathpazo}
  • Helvetica
\usepackage[T1]{fontenc}
\usepackage[scaled]{helvet}
\renewcommand*\familydefault{\sfdefault}

9.5  TeXLive + ko.tex

ko.TeX is a Korean typesetting package.

  • This is for Windows distribution.
:: To add ko.tex to your TeXLive installation:
tlmgr --location=http://ftp.ktug.or.kr/KTUG/texlive/2011 install collection-kotex

:: To update the TeX tree:
mktexlsr

:: To update some font maps:
updmap-sys --enable Map=xxxx.map

9.6  SumatraPDF + TeXmaker inverse search setup

At the command line, enter (Windows):

"C:\Program Files\SumatraPDF\SumatraPDF.exe" -inverse-search "C:\Program Files\Texmaker\texmaker.exe '%f' -line %l"

Change the paths appropriately.

Or, use SumatraPDF for TeX users and change the option:

C:\Program Files\Texmaker\texmaker.exe "%f" -line %l

However, TeXworks has a nice PDF viewer with a built-in inverse search functionality. TeXworks is probably already installed with your TeX distribution.

9.7  How to use TeX in GMail and any other website with Firefox

If you use Firefox, you can use send emails with TeX-rendered equation images.

9.8  Installing a Spell Checker for TeXworks

  1. Go here and obtain appropriate dictionary files. For example, US English.
  2. Follow this direction to install the obtained dictionary files.
    • For Windows 7 place .dic and .aff files in the following directory:
:: TeXLive
C:\Users\<user name>\.texlive2011\texmf-config\texworks\dictionaries

:: MikTeX
C:\Users\<user name>\AppData\Local\MiKTeX\<MiKTeX version>\TeXworks\<TeXworks version>\dictionaries

Then, restart TeXworks and select the installed dictionary in Edit > Spelling menu.

9.9  CV Templates

9.10  Grammar Check

One missing functionality in LaTeX is a grammar checker, while Microsoft Word has the best grammar checker. To use MS Word's grammar checker, I do as follows:

  1. After all writing is done, convert .tex to .html using the htlatex command of TeX4ht.
  2. Open the html file in a web browser and copy all contents to the clipboard.
  3. Open MS Word and paste to a blank document.
  4. Check grammar.
]]>chang 2012-01-30T03:26:30Z Mon, 30 Jan 2012 03:26:30 GMT chang MyName http://www.chkwon.net/Main/MyName My name is 권창현 in Korean. Its break-down is as follows:

LanguageFamily NameGiven Name
EnglishKwonChanghyun
Korean권창현
Hanja權昶賢
]]>chang 2012-01-29T02:46:37Z Sun, 29 Jan 2012 02:46:37 GMT chang Teaching http://www.chkwon.net/Main/Teaching University at Buffalo

Current students are required to access UBlearns.

  • IE 320 Engineering Economy (Spring 2012)

Applied concepts of economic decision making, including present worth analysis, cash flow equivalence, replacement analysis, equipment selection. Open to students in any discipline. [Sample Syllabus (subject to change)]

  • IE 326 Planning for Production and Service Enterprises (Fall 2008, 2009, 2010, 2011)

Examines principles central to the planning of a production process. Topics include forecasting, location analysis, inventory management, supply chain management, push and pull systems, shop scheduling and lean manufacturing. [Sample Syllabus (subject to change)]

  • IE 459/514 Revenue Management (Spring 2009, 2010, 2011)

Revenue Management (RM), or Yield Management, is a set of operational tools for generating more revenue with resource allocations and/or dynamic pricing. In this course, we will cover the fundamental concepts of RM, with mathematical models and algorithms, including capacity control, network capacity control, overbooking, dynamic pricing, customer choice modeling, pricing under competition, estimation and forecasting. By the end of this course, students will be able to understand the basic principles of RM, build mathematical models and suggest proper computational solution methods. [Sample Syllabus (subject to change)]

  • IE 671 Nonlinear Programming (Fall 2009, 2011)

Introduces single and multivariate classical optimization and Kuhn-Tucker theory. Computational methods, including penalty function, barrier function, gradient, are discussed. [Sample Syllabus (subject to change)]

  • IE 677 Network Optimization (Fall 2010)

Introduces solutions to graph theory and optimization problems on directed and undirected graphs. Network flow, transportation, assignment, maximum flow, shortest path, and minimum spanning tree problems are discussed. Some nonlinear network problems including traffic assignment are also discussed. [Sample Syllabus (subject to change)]

]]>chang 2012-01-19T18:18:26Z Thu, 19 Jan 2012 18:18:26 GMT chang QR http://www.chkwon.net/Main/QR Changhyun (Chang) Kwon

Assistant Professor
Department of Industrial & Systems Engineering
University at Buffalo, SUNY
400 Bell Hall, Buffalo, NY 14260, USA

E-mail: chkwon@buffalo.edu

Web: http://www.chkwon.net

Office Phone: 716-645-4705

If you leave a voice message to the above number, Dr. Kwon will receive an email and may check it within an hour or so.

]]>chang 2012-01-17T17:08:30Z Tue, 17 Jan 2012 17:08:30 GMT chang Places http://www.chkwon.net/Main/Places

Table of Contents (hide)

  1. 1. Musuem / Art Gallery
  2. 2. National Parks / State Parks
  3. 3. Campgrounds
  4. 4. Zoo / Aquarium / Botanical Garden
  5. 5. Children's Museum
  6. 6. University
  7. 7. Airports - Destinations and Transfers

Musuem / Art Gallery

National Parks / State Parks

Campgrounds

Zoo / Aquarium / Botanical Garden

Children's Museum

University

Airports - Destinations and Transfers

]]>chang 2012-01-15T02:50:32Z Sun, 15 Jan 2012 02:50:32 GMT chang Research http://www.chkwon.net/Main/Research If we knew what it was we were doing, it would not be called research, would it? - Albert Einstein

Research Interests

  • Methodology:
    • Nonlinear Optimization, Infinite Dimensional Optimization, Optimal Control
    • Variational Inequalities, Game Theory, Equilibrium Programming
  • Application:
    • Transportation and Traffic Theory, Congestion Pricing, Hazardous Material Transportation
    • Revenue Management, Dynamic Pricing, e-Commerce, Online Advertisement

Dr. Kwon's research has been supported by various funding agencies including the National Science Foundation, the U.S. Department of Transportation, and the Embassy of Canada in Washington D.C.

Journals and Conferences

Grants

1.
(PI) “Towards Socially and Economically Sustainable Urban Developments”, U.S. Department of Transportation through University Transportation Research Center, Region II, Research Initiative, co-Is: Jiyoung Park (UB), Qian Wang (UB), 12/23/2011 - 09/30/2012
2.
(PI) “Processing Area Improvement Initiative”, Goodwill Industries of WNY, Inc. through the Center for Industrial Effectiveness, 11/30/2011 - 5/30/2012
3.
(PI) “Collaborative Research: Regulating Hazardous Materials Transportation by Multi-Objective Dual Toll Pricing”, National Science Foundation, co-PIs: Rajan Batta (UB) and Young-Jun Son (U Arizona), 09/01/2011 - 08/31/2014 [CMMI-1068585]
4.
(PI) “Robust Routing for Hazardous Materials Transportation with Conditional Value-at-Risk on Time-Dependent Networks”, U.S. Department of Transportation through University Transportation Research Center, Region II, Faculty Development Minigrants, 07/01/2011 - 09/30/2012 [49111-07-23]
5.
(PI) “Food Service Efficiency & Capacity Analysis Study/Assessment”, Efficient Schools Team, LLC., Buffalo, NY, through The Center for Industrial Effectiveness, 03/30/2011 - 09/30/2011
6.
(PI) “Economic Implications of the Canada-US Border Bridges: Applying a Transportation-Combined Multiregional Input-Output Model for Canada and the U.S.”, Embassy of Canada in Washington, D.C., co-PI: Jiyoung Park (UB), 03/01/2011 - 02/28/2012 [link]
7.
The Canadian-American Studies Committee, Fall 2010 Grant Competition, with Jiyoung Park (UB), 2010
8.
Multiregional Policy Analysis LLC, 2010.

Publications

Working Papers

1.
Kang, Y.⋆, R. Batta and C. Kwon, “Value-at-Risk Model for Hazardous Material Transportation” [PDF] [show abstract]
2.
Kang, Y.⋆, R. Batta and C. Kwon, “Generalized Route Planning Model for Hazardous Material Transportation with VaR and Equity Considerations” [PDF] [show abstract]
3.
Kwon, C., T. Lee, P. Berglund⋆, “Robust Shortest Path Problems with Two Uncertain Multiplicative Cost Coefficients” [PDF] [show abstract]
4.
Ahmed, M. T.⋆ and C. Kwon, “Optimal Contract Problems in Online Advertising with Risk Considerations” [PDF] [show abstract]

(⋆ = Dr. Kwon’s students)

Journal Articles (Published or To Appear)

1.
Ahmed, M.T.⋆ , and C. Kwon (2012), “Pricing Game of Online Display Advertisement Publishers”, European Journal of Operational Research, 219, 477-487. [DOI] [PDF] [show abstract]
2.
Jung, T.⋆ and C. Kwon (2011), “Retailer-Supplier Matching: an Application of the Deferred Acceptance Algorithm” International Journal of Services Operations and Informatics, 6(3), 248–258. [DOI] [PDF] [show abstract]
3.
Srinivasan, A.⋆ and C. Kwon, “Operations of Online Advertising Services and Publisher’s Option”, Journal of the Operational Research Society, in print. [DOI] [PDF] [show abstract]
4.
Chung, B.D., J. Li, T. Yao, C. Kwon and T. L. Friesz (2011), “Demand Learning and Dynamic Pricing under Competition in a State-Space Framework ”, IEEE Transactions on Engineering Management, in print [DOI] [PDF] [show abstract]
5.
Wang, J.⋆, Y. Kang⋆, C. Kwon and R. Batta, “Dual Toll Pricing for Hazardous Material Transport with Linear Delay”, Networks and Spatial Economics, accepted [DOI] [PDF] [show abstract]
6.
Friesz, T. L., T. I. Kim, C. Kwon and M. A. Rigdon (2011), “Approximate Network Loading and Dual Time Scale Dynamic User Equilibrium”, Transportation Research Part B, 45(1), 176-207. [DOI] [PDF] [show abstract]
7.
Moon. Y. and C. Kwon (2011), “Online Advertisement Service Pricing and an Option”, Electronic Commerce Research and Applications, 10(1), 38-48. [DOI] [PDF] [show abstract]
8.
Kwon, C. (2011), “Single-Period Balancing of Pay-Per-Click and Pay-Per-View Online Display Advertisements”, Journal of Revenue and Pricing Management, 10(3), 261-270. [DOI] [PDF] [show abstract]
9.
Kwon, C., T. L. Friesz, R. Mookherjee, T. Yao and B. Feng (2009), “Non-cooperative Competition Among Revenue Maximizing Service Providers with Demand Learning”, European Journal of Operational Research, 197(3), 981-996. [DOI] [PDF] [show abstract]
10.
Kwon, C. and T. L. Friesz (2008), “Valuation of American Options by the Gradient Projection Method”, Applied Mathematics and Computation, 206(1), 380-388. [DOI] [PDF] [show abstract]
11.
Friesz, T. L. and C. Kwon (2008), “Supply Chain Design in Perfect Competition”, International Journal of Services Operations and Informatics, 3(3/4), 340-356. [DOI] [PDF] [show abstract]
12.
Miller, T. C., T. L. Friesz, R. L. Tobin and C. Kwon (2007), “Reaction Function Based Dynamic Location Modeling in Stackelberg-Nash-Cournot Competition”, Networks and Spatial Economics, 7(1), 77-97. [DOI] [PDF] [show abstract]

Edited Books

1.
Batta, R. and C. Kwon, “Handbook of OR/MS Models in Hazardous Materials Transportation”, Springer (In Progress)

Refereed Proceedings

1.
C. Kwon (2011), “Conditional Value-at-Risk Model for Hazardous Materials Transportation”, in Proceedings of the 2011 Winter Simulation Conference, S. Jain, R. R. Creasey, J. Himmelspach, K. P. White, and M. Fu, eds. pp. 1708-1714 [show abstract]
2.
Jeong, B., C. Kwon, Y.S. Zhang, and S. Yang (2010), “Evaluating the Research Performance of a R&D Program: an Application of DEA”, Proceedings of the International Multi-Conference of Engineers and Computer Scientists 2010 Vol III. [PDF]
3.
Friesz, T. L., M. A. Rigdon and C. Kwon (2008), “A New Gradient Projection Algorithm for the Dynamic User Equilibrium Problem”, International Symposium on Dynamic Traffic Assignment 2008
4.
Friesz, T. L., C. Kwon and M. A. Rigdon (2007), “A Model of Competition in Service Management”, Proceedings of 2007 IEEE/INFORMS International Conference on Service Operations and Logistics, and Informatics [DOI]
5.
Friesz, T. L., C. Kwon and R. Mookherjee (2007), “A Computable Theory of Dynamic Congestion Pricing”, In: Transportation and Traffic Theory 2007: Papers selected for presentation at ISTTT17, a peer reviewed series since 1959, R. E. Allsop, M. G. H. Bell and B. G. Heydecker (Eds.), pp. 1-26. [PDF] [show abstract]
6.
Friesz, T. L., C. Kwon, A. Chow and B. Heydecker (2007), “A Dynamic Efficient Toll Problem”, The Sixth Triennial Symposium on Transportation Analysis (TRISTAN VI)
7.
Friesz, T. L., R. Mookherjee and C. Kwon (2006), “Dynamic Non-cooperative Games as a Foundation for Modeling Dynamic User Equilibrium”, The First International Symposium on Dynamic Traffic Assignment [PDF]
8.
Friesz, T. L., C. Kwon and R. Mookherjee (2006), “A Computable Theory of Dynamic Congestion Pricing”, The First International Symposium on Dynamic Traffic Assignment
9.
Kwon, C. and T. L. Friesz (2006), “Valuation of American Options by the Gradient Projection Method”, College of Engineering Research Symposium 2006, Penn State University

Book Chapters

1.
Friesz, T. L., T. I. Kim, C. Kwon and M. A. Rigdon (2010), “Computing Dual Time Scale Dynamic User Equilibria”, in New Developments in Transport Planning: Advances in Dynamic Traffic Assignment (Eds.: C. M. J. Tampere, F. Viti and L. H. Immers), Edward Elgar Publishing. [LINK]
2.
Friesz, T. L., C. Kwon and D. Bernstein (2009), “Evolutionary and Preferential Attachment Models of Demand Growth”, in Complexity and Spatial Networks: In Search of Simplicity (Eds.: Aura Reggiani and Roberto Patuelli), Springer-Verlag. [LINK] [DOI]
3.
Friesz, T. L., C. Kwon and D. Bernstein (2007), “Analytical Dynamic Traffic Assignment Model" in Handbook of Transport Modelling 2nd Edition (Eds.: D. A. Hensher and K. J. Button), Elsevier. [LINK]
4.
Friesz, T. L. and C. Kwon (2007), “Strategic Freight Network Planning Models and a Dynamic Oligopolistic Urban Freight Network" in Handbook of Transport Modelling 2nd Edition (Eds.: D. A. Hensher and K. J. Button), Elsevier. [LINK]
]]>chang 2011-12-31T13:06:38Z Sat, 31 Dec 2011 13:06:38 GMT chang HomePage http://www.chkwon.net/Main/HomePage

Changhyun Kwon is an Assistant Professor in Industrial & Systems Engineering at University at Buffalo, the State University of New York. His research interests include transportation systems analysis and service operations problems. His research has been supported by various organizations including the National Science Foundation, the U.S. Department of Transportation, and Canadian Embassy. He received a PhD in Industrial Engineering in 2008 and an M.S. in Industrial Engineering and Operations Research in 2005, both from the Pennsylvania State University. He also received a B.S. in Mechanical Engineering from KAIST in 2000.

Graduate students who joined UB recently may find A Guide To Beginning Graduate Students At UB helpful. The guide may also be helpful to graduate students in other universities. See also Resources for many other useful information.

Contact

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Buffalo Skyline

]]>chang 2011-12-05T18:35:49Z Mon, 05 Dec 2011 18:35:49 GMT chang Career http://www.chkwon.net/Main/Career Links
]]>chang 2011-11-30T14:53:13Z Wed, 30 Nov 2011 14:53:13 GMT chang Linux http://www.chkwon.net/Main/Linux Ubuntu

I believe Ubuntu is the best linux distribution for any personal use. Its support for package install/update/remove is really powerful and easy to use even for beginners like me.

Linux Community

Tutorials

Thinkpad TrackPoint Scrolling in Ubuntu

]]>chang 2011-10-22T15:46:23Z Sat, 22 Oct 2011 15:46:23 GMT chang