While many animals utilize socially transmitted information, there is still much to understand about how individuals form social networks and these influence information use. Here, we tested the hypothesis that food distribution availability can structure transfer when discovering novel sources. We experimentally manipulated access in wild food-caching mountain chickadees, Poecile gambeli , by ...

Mechanical end effectors capable of dextrous manipulation are now a reality. Solutions to the high level control issues, however, have so far proved difficult to formulate. We propose a methodology for control which produces the functionality required for a general purpose ma­ nipulation system. It is clear that the state of a hand/object system is a complex interaction between the geometry of ...

In this paper, we propose a novel design of end-effectors that is specialized in caging manipulation. Caging manipulation has several advantages comparing with traditional grasping manipulation. For example, caging can allow small gap/margin between end-effectors and a target object, making the manipulator relieved from constant contact and precise control. Therefore, caging manipulator can avo...

Virtual reality display systems reflect an emerging technology that is used to visualize virtual three-dimensional (3D) worlds. This article describes and evaluates tools for developing software applications that are targeted at virtual reality display systems. The evaluation focuses on the relevance of command language or direct manipulation with graphical representation as the fundamental int...

In order to implement storage and manipulation of multimedia information, especially full-motion videos, a new data model and a new language are required, because they should represent complex data of not only traditional data, characters and numerals, but also new media such as images, long texts, sounds and full motion videos. Data model B5 that is propose’d in this paper is a large sheet wit...

Though graphs are flexible enough to model any kind of data structure in principle, for some structures this results in a rather large overhead. This is for instance true for lists, i.e., edges that are meant to point to an ordered collection of nodes. Such structures are frequently encountered, for instance as ordered associations in UML diagrams. Several options exist to model lists using sta...

Permisionless decentralized ledgers (“blockchains”) allow anonymous participants and avoid control or “censorship” by any single entity. In contrast, permissioned decentralized ledgers allow only explicitly authorized parties to maintain the ledger. Permissioned ledgers support more flexible governance and a wider choice of consensus mechanisms. Both kinds of decentralized ledgers may be suscep...

Recent reports of directed reprogramming have raised questions about the stability of cell lineages. Here, we have addressed this issue, focusing upon skin-derived precursors (SKPs), a dermally derived precursor cell. We show by lineage tracing that murine SKPs from dorsal skin originate from mesenchymal and not neural crest-derived cells. These mesenchymally derived SKPs can, without genetic m...

In this work a Cartesian impedance controller for flexible joint robots is applied in a mobile manipulation setup for opening a door. The considered mobile manipulation system is a combination of the DLR-Lightweight-Robot-II and the DLR-Hand-II with a mobile platform. The presentation focuses on the Cartesian impedance control of the arm with special emphasis on the treatment of the joint elast...

Space-based robotic systems for diagnosis, repair and assembly of systems will require new techniques of planning and manipulation to accomplish these complex tasks. ' results of work in assembly task representation, discrete-ohd synthesis which provide a design environment for flexible assembly systems in manufacturing applications, and which extend to planning-of manipulation operations in un...