WorldCat Identities

Powers, David F. (David Francis) 1912-

Works: 28 works in 49 publications in 3 languages and 2,813 library holdings
Genres: Handbooks and manuals  Biography  History  Records and correspondence  Nonfiction television programs  Personal narratives  Portraits 
Roles: Author
Classifications: E842, 973.9220924
Publication Timeline
Most widely held works by David F Powers
Johnny, we hardly knew ye : memories of John Fitzgerald Kennedy by Kenneth P O'Donnell( Book )

22 editions published between 1970 and 2013 in English and Undetermined and held by 2,710 WorldCat member libraries worldwide

The two devoted Kennedy aides provide a warm portrait of the former president drawn from their fifteen years in his service
Adobe Dreamweaver CS5 with PHP by David M Powers( )

1 edition published in 2010 in English and held by 39 WorldCat member libraries worldwide

Provides information on using Dreamweaver CS5 to create applications, covers the fundamentals of PHP and database design, and how to enhance Web pages with Ajax
Kennedy, apenas te conocimos : perfil humano de un estadista by Kenneth P O'Donnell( Book )

1 edition published in 1976 in Spanish and held by 5 WorldCat member libraries worldwide

Memoirs of John Fitzgerald Kennedy by Kenneth P O'Donnell( Book )

1 edition published in 1970 in English and held by 2 WorldCat member libraries worldwide

by David F Powers( )

in English and held by 2 WorldCat member libraries worldwide

Election statistics, correspondence, speeches by John F. Kennedy, political polls, and audiotapes. Includes material relating to the book "Johnny We Hardly Knew Ye" (1972) by Powers, Kenneth P. O'Donnell, and Joe McCarthy, and to Kennedy's political career in Massachusetts and as president
Presidential auction catalog : the estate of David F. Powers by David F Powers( Book )

1 edition published in 2012 in English and held by 2 WorldCat member libraries worldwide

Floor Texture Visual Servo Using Multiple Cameras for Mobile Robot Localization by Takeshi Matsumoto( Book )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

A local localization algorithm for mobile robots has been proposed, which is based on the idea of using multiple off-the-shelf webcams to perform ground texture tracking. The localization module has been developed on a custom built robot and tested in real indoor environments with dramatic improvement over encoder based dead reckoning approaches. To take advantage of the constraints provided by the system and the type of environment the robot is exposed to, various characteristics of the camera were configured and adjusted to reduce the complexity in the tracking task. There are two constraints that are used for the proposed approach to work, which are: The elevation of the camera to the ground remains constant, and The features being tracked can only translate and not rotate in between frames. Due to the processing requirement, only two filters are actively used, which are the lens warp removal filter and block removal filter. After exploring several scoring algorithms to find the feature, a simple algorithm based on the standard deviation has been used with a shape of 16 by 16 pixel square. To improve the processing time for finding the feature, a prediction is made to where the feature is located, followed by a spiral search sequence to quickly find the best candidate, which has lead to approximately 30% speed up. By accounting for some of the sub-pixel motions by interpolating around the best candidate, the precision of the tracking increased by approximately 6 times. To distinguish between translation and rotation of the robot, a second tracker was introduced to form a two-cameras-on-the-side configuration. The two motion vectors were smoothed by using a sliding window of size 4 and a quadratic weight decay function to better synchronise the two data sources. A hybrid motion model has been introduced to handle two types of motions; regular motion based on the locomotive constraints and irregular motion, caused by bumps and sudden slippages. By switching between the two, the performance of the algorithm showed some improvements even though the frequency of erroneous tracking is already quite small. The proposed localization algorithm has been tested on various surfaces types that are commonly found in indoor environments with less than 1% error on both translation and rotation. It was found that the algorithm did not operate so well on very dark surfaces with highly repetitive or indistinguishable texture patterns. As long as the constraints can be maintained, the approach allows for an immediate and precise localization with low cost hardware at a reasonably small processing cost
Cold war : part 1 by Ted Koppel( Recording )

1 edition published in 1985 in English and held by 1 WorldCat member library worldwide

In this recording of the last half of the ABC News Special program "45/85," narration by news anchors Ted Koppel and Peter Jennings and audio from archive film and television footage are combined with new interviews, to document post-World War II history from 1945 to 1985, focusing especially on the Cold War. Begins with President Richard Nixon commenting on the Bay of Pigs fiasco, the Cuban missile crisis, and early military intervention in Vietnam. Features interviews with President Ronald Reagan and former Presidents Jimmy Carter and Gerald Ford. Includes political figures, foreign leaders, military personnel, and civil rights advocates
Ford Hall Forum audio tapes by Ford Hall Forum( )

in English and held by 1 WorldCat member library worldwide

This collection consists of audio tape recordings of Ford Hall Forum programs, recorded between 1961 and 1998. The collection also contains one video tape. Researchers should note the date of the recording is often different from the date of the broadcast. The finding aid indicates the date of recording. The recordings were assigned catalog numbers (RCS-XXX) by the Northeastern University Libraries' Media Center. The collection includes descriptions of the programs, information about the speakers, and indices by speaker, call number and subject area compiled by the Media Center staff. Each recording has corresponding information sheets (folders 5-12, box 11), containing information regarding length, speaker, general subject, lecture topic, date recorded, date broadcasted, and date of acquisition. Audiocassette RCS-566 Janet Reno: "Youth Violence" is absent from the collection
John F. Kennedy papers by John F Kennedy( )

in English and held by 1 WorldCat member library worldwide

Typed copy of Kennedy's commencement address delivered, 31 May 1957, at the University of South Carolina, with cover letter, 23 Aug. 1972, from David Powers, Museum Curator, (John F. Kennedy Library, Waltham, Mass.), to Milton S. Baker, Assistant to the President, University of South Carolina
JFK--a time remembered( Visual )

1 edition published in 1990 in English and held by 1 WorldCat member library worldwide

Examines the impact on the American people of the assassination of John F. Kennedy and of television coverage of the subsequent events, including the funeral, as well as the arrest and assassination of Lee Harvey Oswald
"Johny, we hardly knew ye" memories of John Fitzgerald by Kenneth P O'Donnell( Book )

1 edition published in 1972 in English and held by 1 WorldCat member library worldwide

PHP Dong tai wang ye she ji by David F Powers( Book )

1 edition published in 2012 in Chinese and held by 1 WorldCat member library worldwide

Ben shu fen wei 3 ge bu fen,Gong 17 zhang.Di yi bu fen xiang chu xue zhe jie shao PHP kai fa de bi bei zhi shi,Zhong dian jie shao PHP de gong neng,Ce shi huan jing,Ji ben yu fa deng;Di er bu fen nei rong bao kuo bao han wen jian,Chu li biao dan,Shang chuan he guan li wen jian,Sheng cheng suo lüe tu yi ji shi yong hui hua chuan di xin xi deng;Di san bu fen li yong PHP yu MySQL de jue jia zu he da zao dong tai wang zhan,Qi zhong bao kuo MySQL jian jie,Shi yong PHP lian jie MySQL,Chuang jian dong tai zai xian tu ku,Nei rong guan li,Ge shi hua wen ben he ri qi,Cong duo ge biao zhong ti qu shu ju,Guan li duo ge shu ju ku biao yi ji shu ju ku yong hu shen fen yan zheng deng
An Empirical Study of Graph Grammar Evolution by Martin Luerssen( Book )

1 edition published in 2009 in English and held by 1 WorldCat member library worldwide

The system presented in this chapter is a significant step towards achieving a simple, formal, comprehensive basis for graph evolution. Its main significance arises from simplifying hypergraph grammars for the purpose of evolutionary optimization, which avoids many of the complexity pitfalls of "biologically realistic" models. Yet unlike other simpler models, the graph transformations are not predefined and fixed here, but fully evolvable, allowing for an automatic optimization of the graph design bias and thus a greater degree of domain independence. It assumes, however, that we have a method for evolving such grammar. Shared grammar evolution unites several aspects of grammatical bias and developmental systems into an effective method that can evolve anything derivable from a CFG, including graphs. The success of this approach is governed by a number of factors, and through application to a diverse set of design problems, we have gained some perspective on these. Firstly, significant performance improvements can be obtained when emphasizing diversity in the grammar population. This can be accomplished most effectively by adding an entropy measure of phenotypic diversity as an evolutionary objective. Further significant improvements are obtained in combination with a less restrictive size objective, but notable increases in solution size become an issue here. Alternatively, we have also presented a multi-objective island model that exhibits performance benefits comparable to the entropy method. We further propose the application of concepts from swarm intelligence to accelerate convergence, but associated experiments fail to produce significant performance improvement, although they reveal significant increases in production reuse that lead to a more compact grammar. In relation to this, we ascertained that the search process is severely constrained by co-optimization towards a size objective, yet excessive bloat occurs as soon as the effective importance of size is reduced. The representational effectiveness of graph grammars becomes evident with the latter, but at great computational cost; a proper balance has not yet been found. Future performance improvements should arise from a better understanding of how the grammar establishes a preferential bias. We need to develop a more intelligent selection scheme that makes exploratory mutations into distant search regions viable, which, in
Embodied Conversational Agents for Education in Autism by Marissa Milne( Book )

1 edition published in 2011 in English and held by 1 WorldCat member library worldwide

"Johnny, we hardly knew ye" by Kenneth P McDonnell( Book )

1 edition published in 1973 in English and held by 1 WorldCat member library worldwide

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  Kids General Special  
Audience level: 0.14 (from 0.09 for The Kenned ... to 0.99 for Papers, 19 ...)

Alternative Names
Powers, David F.

Powers, David Francis.

Дэвид Пауэрс

دیوید پاورز