XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX THE INTERNATIONAL SOCIETY OF DYNAMIC GAMES E-LETTER, issue No. 7, 2 October 1992 Edited by Raimo P. Hamalainen and Harri Ehtamo Systems Analysis Laboratory, Helsinki University of Technology ISDG@FINHUT.BITNET or ISDG@FINHUT .HUT.FI XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Dear Dynamic Game Theorist, This is the seventh issue of the Society’s electronic newsletter. The basic minimum work principle in editing this e-letter is that the READERS send important notes and information about symposia, conferences and workshops of dynamic games, as well as abstracts of Ph.D. theses, papers and books, which they want to be included in the newsletter. The format is described below. We hope that no retyping will be needed so please follow the instructions and sample shown below carefully. The news should be concise to keep the newsletter readable. Requests for more complete information about any news item should be directed to its contributor. We appreciate any comments and suggestions that you may have on this e-letter. Next issue is planned to be sent out after two months. Looking forward to receiving your news contributions. Raimo P. Hamalainen and Harri Ehtamo P.S. The two e-mail addresses given above are in principle identical. Depending on your network one or both of them should work. If you are in a BITNET node you only need ISDG at FINHUT. In any case the safest and easiest way is to use the reply command in your e-mail system. XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Contributed by the Editors : October 2 MODEL FOR NEWS SUBMISSIONS Maximum line length is 72 characters. Place the text between two lines of x:ses. The first line should state "Contributed by" and followed by the contributor’s name, in brackets and the date. Then there should be a title line and the text. This info block should be sent to ISDG at FINHUT. XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Contributed by Tamer Basar September 30 Minutes of the ISDG Executive Board Meeting, July 15, 1992; Grimentz, Switzerland The Executive Board of the Society met in Grimentz, Switzerland, in July 15, 1992, on the occasion of the 5th Symposium on "Dynamic Games and Applications." The agenda of the meeting consisted of four major topics: Annals Electronic Newsletter Symposia planned for 1994 and 1996 Organization of the ISDG 1. Annals Tamer Basar, current president of ISDG, reported on the progress of the establishment of an Annals for the Society, with Birkhauser as the official publisher. The first volume, scheduled for early 1993, and co-edited by Tamer Basar and Alain Haurie, will be an edited volume, comprised of a subset of the papers presented at the 5th Symposium. The papers will be reviewed (with the reviews handled by a Board of Associate Editors), and possibly revised, before they are accepted for publication in the volume. The Annals will be governed by an Editorial Board, composed of the current members of the Executive Board, and L. Berkovitz, G. Leitmann, T.S.E. Raghavan, and N.N. Krasovski. Tamer Basar will act as the Managing Editor. To plan for the future volumes of the Annals, the Editorial Board was going to have a meeting in Grimentz, on July 16, 1992. 2. Electronic Newsletter Tamer Basar expressed the Board’s gratitude to Harri Ehtamo, for handling the electronic newsletter from its inception until today. It was decided to make the electronic newsletter more frequent and shorter. First an advance notice on an upcoming issue will be sent out to solicit contributions, and shortly after the newsletter will be sent out (on schedule) even if it is short. 3. Future Symposia 1994. It had been decided in the Florence meeting of the Executive Board, to hold the 1994 symposium in Boulder, Colorado. But the plans had to be changed, because the designated organizer may not be in Boulder in 1994. The Board accepted a new proposal, received from Michele Breton and Georges Zaccour, with Quebec as the site of the 1994 Symposium. Michele Breton was selected as the general chairperson of the Symposium. It was also decided to split the responsibilities of organization and program, and to institute an International Program Committee (IPC) to oversee the formation of the Technical Program of the Symposium. Geert Jan Olsder was named as the Chairperson of this IPC for the 6th Symposium. 1996. The Executive Board agreed in principle to hold the 1996 symposium in Japan, with the final decision pending, until a formal proposal is received from the potential organizers in Japan. As possible conflicts, it was pointed out that 1996 is the year of the IFAC World Congress (San Francisco), and the CDC will be held in Kobe in December. One possibility would be to move the dates of the Symposium to December, and hold it either before or after the CDC. Further discussion will be held on this topic. 4. Organization The term of Tamer Basar as President is over with this symposium. It was unanimously decided to ask him to serve for one more (two-year) term, which he accepted. It was also proposed, and unanimously voted on, to add to the bylaws of the ISDG the clause that the same person cannot serve as president for more than two consecutive terms. It was also decided to continue the Secretariat in Helsinki, under Raimo Hamalainen and Harri Ehtamo, for another two-year term. Harri will continue to serve as the Electronic Newsletter Editor. The question of the term of the Executive Board members was also raised. This will be taken up together with a more formal membership structure (with a possibility of fees, etc.) at an upcoming meeting. XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Contributed by Margriet Klompstra August 17 DOCTORAL THESIS Margriet B. Klompstra at Delft University of Technology, Department of Technical Mathematics and Informatics, September 1, 1992. Supervisor: Prof. dr. G.d. Olsder Time aspects in games and in optimal control This thesis deals with a number of aspects on both the theory of dynamic games and optimal control. The theory of both cooperative and noncooperative dynamic games has been well developed. In the third chapter different modes of cooperation are considered and it is investigated whether or not it is possible to switch between these cooperative modes and the noncooperative mode. This problem is studied for the infinite horizon two-player game. First the decision whether to cooperate or not to cooperate, assumes no future switching moments. Since the decision is made continuously in time, in reality many such switches may (and will) occur. Next, the possibility of (maximal) one future switch is considered, For problems in nonzero-sum differential games with prescribed final time and prescribed final state responsibilities are introduced. Such problems are considered for different information paths. In the last two chapters the final time is free, but constrained. First, an application of a linear-quadratic nonzero-sum game in economics is considered. Two firms in a duopoly market, extract gas from a nonrenewable resource which is common property. The game ends whenever the resource is exhausted, so the final time is implicitly determined. An algorithm, based on the maximum principle, has been proposed to solve this problem. Since there may be more than one solution, also the stability properties of the obtained solutions have been investigated. Next, the minimum fuel weather routing problem is considered. In this problem the optimal route of a ship has to be determined so that the fuel consumption will be minimized. An algorithm to calculate the minimum fuel route is proposed, which is called the isopone method. The state space is a three dimensional space, it consists of the position of the ship and the time. The algorithm describes energy fronts in this three dimensional state space. The final time is unknown, it is however constrained not to exceed some maximum value. One of the inputs in the algorithm are the charateristics of the ship. Realistic data, such as weather forecasts, oceancurrent, geographical constraints, and so on can be implemented. (Those who are interested in obtaining the thesis book may contact the author. E-mail: KLOMPSTR@NLR.NL) XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX End of ISDG E-LETTER issue No. 7, 2 October 1992