YuChi Ho
YuChi "Larry" Ho  

Born  
Residence  United States 
Nationality  American (1961present) Chinese (19341961) 
Alma mater  Harvard University Massachusetts Institute of Technology 
Awards  Richard E. Bellman Control Heritage Award (1999) Rufus Oldenburger Medal (1999) IEEE Control Systems Science and Engineering Award NAE Member CAE Member CAS Member 
Scientific career  
Fields  Applied mathematics Control theory 
Institutions  Harvard University 
Thesis  A Study of the Optimal Control of Dynamic Systems^{[1]} 
Doctoral advisor 

Doctoral students 
YuChi "Larry" Ho (Chinese: 何毓琦; pinyin: Hé Yùqí; born March 1, 1934) is a ChineseAmerican mathematician, control theorist, and a professor at the School of Engineering and Applied Sciences, Harvard University.
He is the coauthor of Applied Optimal Control,^{[2]} and an influential researcher in differential games, pattern recognition, and discrete event dynamic systems.
Biography[edit]
Education[edit]
YuChi Ho was born on March 1, 1934 in Shanghai, China and left home at the age of 15 in 1949 to complete his high school education in Hong Kong. In 1950, Ho was accepted to the Massachusetts Institute of Technology and came to the U.S. where he received a B.S. in Electrical Engineering in the summer of 1953, at the age of 19. Ho later reported that his initial interests were in mechanical engineering, due to a childhood experience repairing a European ornamental clock without any previous knowledge of its mechanisms. His application to MIT mechanical engineering, however, was routed to the electrical engineering department by mistake, and Ho decided to stay in the department.^{[3]} Ho continued his graduate studies at MIT, receiving a M.S. degree in Electrical Engineering in 1955.
After working for Bendix Aviation for three years, Ho moved to Harvard University in 1958 where he completed a Ph.D. in Applied Mathematics in 1961. His thesis A Study Optimal Control of Dynamic Systems was advised by Arthur E. Bryson, Jr. and Kumpati S. Narendra.
Career[edit]
After finishing his Ph.D. in the spring of 1961, YuChi Ho returned to Harvard in the fall of 1961 for a teaching appointment, receiving tenure in 1965,^{[4]} and remained in the School of Engineering and Applied Sciences until his retirement in 2001. At Harvard, Ho held the title of Gordon McKay Professor of Systems Engineering, Emeritus, as well as the T. Jefferson Coolidge Chair of Applied Mathematics, Emeritus. He was also the visiting professor to the Cockrell Family Regent's Chair in Engineering at the University of Texas, Austin in 1989. In 2001, Ho retired from teaching duties at Harvard after 40 years of service and became a Research Professor. He was appointed (parttime) the Chair Professor and Chief Scientist at the Center for Intelligent and Networked Systems (CFINS), Department of Automation, Tsinghua University. In his career, he has supervised 50 Ph.D. students at Harvard and 3 students at Tsinghua.
Professional activities[edit]
YuChi Ho is a member of the U.S. National Academy of Engineering and a foreign member of the Chinese Academy of Engineering and the Chinese Academy of Sciences. He is also an IEEE Life Fellow and an INFORMS Inaugural Fellow, and a Distinguished Member of the IEEE Control Systems Society. In addition to services on various governmental and industrial panels, and professional society administrative bodies, he was the program chairman for the IEEE Conference on Decision and Control 1972, the general chairman of the IEEE Robotics and Automation Conference 1987, and President of the IEEE Robotics & Automation Society in 1988. Ho cofounded Network Dynamics, Inc., a software firm specializing in industrial automation. He is on the editorial boards of several international journals and is the founding editorinchief of the international Journal on Discrete Event Dynamic Systems.
Community service[edit]
YuChi Ho was the founder and the first chair of the annual United Asian American Dinner of Massachusetts. He also served as the Chairman of the Board of Greater Boston Chinese Cultural Association from 1995 to 1998, the President of the New England Chapter of the Organization of Chinese Americans from 1982 to 1985, a board member of the Mass Endowment for Humanities from 1985 to 1989, and a founding member and member of the steering committee of the 8020 Initiative, a national political movement for Asian Americans.
Honors and awards[edit]
 Guggenheim Fellowship (1970)
 IEEE Control Systems Science and Engineering Award (1989)^{[5]}^{[6]}
 Chiang Technology Achievement Award (1993)
 Richard E. Bellman Control Heritage Award from the American Automatic Control Council (1999)^{[7]}
 Rufus Oldenburger Medal from the American Society of Mechanical Engineers (1999)^{[8]}
 Isaacs Award from the International Society of Dynamic Games (2004)
 Member, US National Academy of Engineering^{[9]}
 Foreign member, China Academy of Engineering
 Foreign member, China Academy of Sciences
Personal life[edit]
Ho became a naturalized citizen of the United States in 1961. He and his wife Sophia^{[10]} have three children and six grand children.^{[11]} They currently reside in Lexington, Massachusetts. Since April 25, 2007, Ho blogs on ScienceNet.cn, a science blog network sponsored by the Chinese Academy of Engineering and the Academy of Sciences.^{[12]}
Work[edit]
Control theory and optimization[edit]
YuChi Ho's research in control theory began when he was a graduate student at MIT. His 1955 paper timedomain compensation for closedloop systems by a delay line method presented a new approach to the synthesis and analysis of closedloop systems in the time domain.^{[13]} Ho collaborated with Rudolf E. Kalman, a pioneer of modern control theory. Before Kalman, time series analysis and classical control theory studied the frequency domain, using harmonic analysis, especially Laplace and Fourier transforms. Kalman developed the study of the time domain using statespace models. Joining Kalman, Ho showed that the statespace representation provides a convenient and compact way to model and analyze dynamical systems with multiple inputs and outputs which would otherwise take multiple Laplace transforms to encode; further, the statespace representation can be extended into nonlinear systems. Their paper controllability of linear dynamic systems,^{[14]} developed the theory of controllability (then known as the "KalmanBertram condition").
Together with Ho's student Robert Lee at MIT, the paper A Bayesian approach to problems in stochastic estimation and control formulated a general class of stochastic estimation and control problems from a Bayesian DecisionTheoretic viewpoint.^{[15]}
Pattern recognition[edit]
After joining the faculty of Harvard University, Ho developed the HoKashyap rule in pattern recognition with his first Ph.D. student, Rangasami L. Kashyap.^{[16]}^{[17]}
Game theory[edit]
Turning his attention to game theory, Ho in 1965 published the paper Differential Games and Optimal PursuitEvasion Strategies,^{[18]} that proved the optimality of a proportional guidance scheme. His paper Nonzero Sum Differential Games^{[19]} was an influential gametheoretic study in systems and control, following earlier work by Samuel Karlin, for example.
Discrete event dynamic systems[edit]
Since the 1970s, Ho focused on research in discrete event dynamic systems, making contributions in perturbation analysis and ordinal optimization, including the book Perturbation Analysis of Discrete Event Dynamic Systems.^{[20]} and the book "Ordinal Optimization  Soft Optimization for Hard Problems" (Springer 2007)
Publications[edit]
Books[edit]
 Bryson, A.E.; Ho, Y.C. (1975). Applied optimal control. Washington, DC: Hemisphere. ISBN 0891162283.
 Ho, Y.C.; Cao, X.R. (1991). Discrete Event Dynamic Systems and Perturbation Analysis. Kiuwer Academic Publishers, Boston. ISBN 0891162283.
 Ho, Y.C.; Zhao, Q.C; Jia, Q.S. (2007). Ordinal Optimization: Soft Optimization for Hard Problems. Berlin: Springer. ISBN 0387372326.
About YuChi Ho's work[edit]
 Gong, W.B.; Yao, D.D. (1999). "An Appreciation of Professor YuChi Ho" (PDF). Journal of Optimization Theory and Applications. 100 (3): 453–456. doi:10.1023/A:1022674003827. Retrieved 20080511.
References[edit]
 ^ ^{a} ^{b} ^{c} ^{d} YuChi Ho at the Mathematics Genealogy Project
 ^ Bryson, A.E.; Ho, Y.C. (1975). Applied optimal control. Washington, DC: Hemisphere.
 ^ On Research and Education (#11) Changing Research Direction and Field of Endeavor
 ^ Harvard Celebrates the launching of the School of Engineering and Applied Sciences September 20, 2007
 ^ "IEEE Control Systems Award Recipients" (PDF). IEEE. Retrieved 20110115.
 ^ "IEEE Control Systems Award". IEEE Control Systems Society. Retrieved 20110115.
 ^ "Richard E. Bellman Control Heritage Award". American Automatic Control Council. Retrieved 20130210.
 ^ "Rufus Oldenburger Medal". American Society of Mechanical Engineers. Retrieved 20130213.
 ^ http://people.seas.harvard.edu/~ho/
 ^ YuChi Ho (20080212). "A Valentine Day Tribute to My Wife". Retrieved 20080520.
 ^ The Family Automobile Trip and vacation in the US
 ^ http://www.sciencenet.cn/blog/何毓琦.htm
 ^ Ho, Y.C. (1955). "Timedomain compensation for closedloop systems by a delay line method". Retrieved 20080511.
 ^ Kalman, R.E.; Ho, Y.C.; Narendra, K.S. (1963). "Controllability of linear dynamical systems". Contributions to Differential Equations. 1 (2): 189–213.
 ^ Ho, Y.; Lee, R. (1964). "A Bayesian approach to problems in stochastic estimation and control". Automatic Control, IEEE Transactions on. 9 (4): 333–339. doi:10.1109/TAC.1964.1105763. Retrieved 20080519.
 ^ Ho, Y.C.; Kashyap, R.L. (1965). "An algorithm for linear inequalities and its applications" (abstract). IEEE Trans. Electron. Comput. 14 (5): 683–688. doi:10.1109/PGEC.1965.264206. Retrieved 20080511.
 ^ Ho, Y.C.; Kashyap, R.L. (1966). "A Class of Iterative Procedures for Linear Inequalities". SIAM Journal on Control. 4: 112. doi:10.1137/0304010. Retrieved 20080519.
 ^ Ho, Y.; Bryson, A.; Baron, S. (1965). "Differential games and optimal pursuitevasion strategies" (abstract). Automatic Control, IEEE Transactions on. 10 (4): 385–389. doi:10.1109/TAC.1965.1098197. Retrieved 20080511.
 ^ Starr, A.W.; Ho, Y.C. (1969). "Nonzerosum differential games" (PDF). Journal of Optimization Theory and Applications. 3 (3): 184–206. doi:10.1007/BF00929443. Retrieved 20080511.
 ^ Ho, Y.C.; Cao, X.R. (1991). "Discrete Event Dynamic Systems and Perturbation Analysis". Kiuwer Academic Publishers, Boston.
External links[edit]
Wikimedia Commons has media related to YuChi Ho. 
 Home Page at Harvard University
 Mathematics Genealogy Project profile
 (in Chinese) (in English) Sciencenet.cn Blog
 Who's Who of Asian Americans biography
 Biography of YuChi Ho from the Institute for Operations Research and the Management Sciences
 1934 births
 Scientists from Shanghai
 Control theorists
 Living people
 Chinese emigrants to the United States
 Richard E. Bellman Control Heritage Award recipients
 Harvard University alumni
 John A. Paulson School of Engineering and Applied Sciences faculty
 Massachusetts Institute of Technology alumni
 Members of the United States National Academy of Engineering
 Foreign members of the Chinese Academy of Sciences
 Guggenheim Fellows