Chapter 3. Topics; Publishing to a Topic; Checking That Everything Works as Expected; Subscribing to a Topic; Checking That Everything Works as Expected; Latched Topics; Defining Your Own Message Types; Defining a New Message; Using Your New Message; When Should You Make a New Message Type?; Mixing Publishers and Subscribers; Summary; Chapter 4. Services; Defining a Service; Implementing a Service; Checking That Everything Works as Expected; Other Ways of Returning Values from a Service; Using a Service; Checking That Everything Works as Expected; Other Ways to Call Services; Summary.
Even simple agents, such as LEGO robots, are capable of exhibiting complex behaviour when they can sense and alter the world around them. From Bricks to Brains offers an introduction to embodied cognitive science and illustrates its foundational ideas through the construction and observation of LEGO Mindstorms robots. Discussing the characteristics that distinguish embodied cognitive science from classical cognitive science, the authors place a renewed emphasis on sensing and acting, on the importance of physical embodiment, and on the exploration of distributed notions of control. They also show how synthesizing simple systems and observing their behaviour can generate new theoretical insights. Numerous examples are brought forward to illustrate a key theme: the importance of environment to an actor. Even simple agents, such as LEGO robots, are capable of exhibiting complex behaviour when they can sense and alter the world around them.
Want to develop novel robot applications, but don’t know how to write a mapping or object-recognition system? You’re not alone, but you’re certainly not without help. By combining real-world examples with valuable knowledge from the Robot Operating System (ROS) community, this practical book provides a set of motivating recipes for solving specific robotics use cases. Ideal for enthusiasts, from students in robotics clubs to professional robotics scientists and engineers, each recipe describes a complete solution using ROS open source libraries and tools. You’ll learn how to complete tasks described in the recipes, as well as how to configure and recombine components for other tasks. If you’re familiar with Python, you’re ready to go. Learn fundamentals, including key ROS concepts, tools, and patterns Program robots that perform an increasingly complex set of behaviors, using the powerful packages in ROS See how to easily add perception and navigation abilities to your robots Integrate your own sensors, actuators, software libraries, and even a whole robot into the ROS ecosystem Learn tips and tricks for using ROS tools and community resources, debugging robot behavior, and using C++ in ROS
Want to develop novel robot applications, but don’t know how to write a mapping or object recognition system? You’re certainly not alone, but you’re not without help. By combining real-world examples with valuable knowledge from the Robot Operating System (ROS) community, this practical book provides a set of motivating recipes for solving specific robotics use cases. Ideal for wide range of robot enthusiasts, from students in robotics clubs to professional robotics scientists and engineers, each recipe describes a complete solution using ROS open source libraries and tools. You’ll not only learn how to complete the task described in the recipe, but also how to configure and recombine the components for other tasks. All recipes include Python code. No robot hardware is required to get started, just experience with Python and Linux. This book is appropriate for undergraduate and graduate students in introductory robotics courses.
“We are not worth more, they are not worth less.” This is the mantra of S. Brian Willson and the theme that runs throughout his compelling psycho-historical memoir. Willson’s story begins in small-town, rural America, where he grew up as a “Commie-hating, baseball-loving Baptist,” moves through life-changing experiences in Viet Nam, Nicaragua and elsewhere, and culminates with his commitment to a localized, sustainable lifestyle. In telling his story, Willson provides numerous examples of the types of personal, risk-taking, nonviolent actions he and others have taken in attempts to educate and effect political change: tax refusal—which requires simplification of one’s lifestyle; fasting—done publicly in strategic political and/or therapeutic spiritual contexts; and obstruction tactics—strategically placing one’s body in the way of “business as usual.” It was such actions that thrust Brian Willson into the public eye in the mid-’80s, first as a participant in a high-profile, water-only “Veterans Fast for Life” against the Contra war being waged by his government in Nicaragua. Then, on a fateful day in September 1987, the world watched in horror as Willson was run over by a U.S. government munitions train during a nonviolent blocking action in which he expected to be removed from the tracks and arrested. Losing his legs only strengthened Willson’s identity with millions of unnamed victims of U.S. policy around the world. He provides details of his travels to countries in Latin America and the Middle East and bears witness to the harm done to poor people as well as to the environment by the steamroller of U.S. imperialism. These heart-rending accounts are offered side by side with inspirational stories of nonviolent struggle and the survival of resilient communities Willson’s expanding consciousness also uncovers injustices within his own country, including insights gained through his study and service within the U.S. criminal justice system and personal experiences addressing racial injustices. He discusses coming to terms with his identity as a Viet Nam veteran and the subsequent service he provides to others as director of a veterans outreach center in New England. He draws much inspiration from friends he encounters along the way as he finds himself continually drawn to the path leading to a simpler life that seeks to “do no harm.&rdquo Throughout his personal journey Willson struggles with the question, “Why was it so easy for me, a ’good’ man, to follow orders to travel 9,000 miles from home to participate in killing people who clearly were not a threat to me or any of my fellow citizens?” He eventually comes to the realization that the “American Way of Life” is AWOL from humanity, and that the only way to recover our humanity is by changing our consciousness, one individual at a time, while striving for collective cultural changes toward “less and local.” Thus, Willson offers up his personal story as a metaphorical map for anyone who feels the need to be liberated from the American Way of Life—a guidebook for anyone called by conscience to question continued obedience to vertical power structures while longing to reconnect with the human archetypes of cooperation, equity, mutual respect and empathy.
I was recently in a brainstorming session with market research and R&D managers at a Fortune 50 client. The marketing manager turns to the R&D technical lead and asks, “can you give me a list of all possible technologies out there?” She was speaking the language of high level summary of the universe of possibilities. The technical lead, on the other hand, translated it as “give me information on the technologies we are capable of delivering in the near future.” Simple miscommunication? Little business impact? Not if you’re trying to stretch the innovation possibilities and the R&D lead disqualifi es longer term technologies because they’re not ready now. That’s one reason why innovation at some companies looks like the same old stuff re-packaged.
After serving in the Vietnam War, S. Brian Willson became a radical, nonviolent peace protester and pacifist, and this memoir details the drastic governmental and social change he has spent his life fighting for. Chronicling his personal struggle with a government he believes to be unjust, Willson sheds light on the various incarnations of his protests of the U.S. government, including the refusal to pay taxes, public fasting, and, most famously, public obstruction. On September 1, 1987, Willson was run over by a U.S. government munitions train during a nonviolent blocking action in which he expected to be removed from the tracks. Providing a full look into the tragic event, Willson, who lost his legs in the incident, discusses how the subsequent publicity propelled his cause toward the national consciousness. Now, 23 years later, Willson tells his story of social injustice, nonviolent struggle, and the so-called American way of life.
An only child living in Aldershot, Brian Stuart has always been in touch with the arts. When his father was called up to the army in 1940 his mother decided to take in boarders who performed weekly in the Hippodrome.
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