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排序方式: 共有216条查询结果,搜索用时 31 毫秒
1.
B. Dix und R. Marutzky 《Holz als Roh- und Werkstoff》1985,43(4):148
Ohne Zusammenfassung 相似文献
2.
3.
4.
MJ O'Neill JA Lewis HM Noble S Holland C Mansat JE Farthing G Foster D Noble SJ Lane PJ Sidebottom SM Lynn MV Hayes CJ Dix 《Canadian Metallurgical Quarterly》1998,61(11):1328-1331
Methanolic extracts prepared from the leaves of Lantana camara have been found to inhibit human thrombin. An assay, in which thrombin activity is measured as a function of clot formation from fibrinogen, was used to guide the fractionation and purification of five principal active constituents (1-5), which were all characterized as 5,5-trans-fused cyclic lactone-containing euphane triterpenes. 相似文献
5.
Alexander Dix 《Datenschutz und Datensicherheit - DuD》2009,33(8):480-482
Patientinnen und Patienten vertrauen sich heutzutage nicht mehr nur ihrem Haus- oder Facharzt, sondern immer h?ufiger auch
einer Gro?klinik („Krankenhausmaschine“) an. Schon dort entsteht die Frage, wie die ?rztliche Schweigepflicht oder besser:
das Patientengeheimnis, noch aufrechterhalten werden kann. Weitere Risiken drohen dem Patientengeheimnis in der zunehmend
vernetzten Verarbeitung von medizinischen Befunden z.B. in Praxisnetzen und auch in der Online-Welt, die zweifellos gro?e
Vorteile für die behandlungsbedürftigen Menschen bringen. Sie werfen aber auch die Frage nach der Verantwortung für die Sicherheit,
Richtigkeit und Verfügbarkeit dieser Daten auf, die nicht selten lebenswichtig sein k?nnen. 相似文献
6.
A taxonomy for and analysis of multi-person-display ecosystems 总被引:2,自引:2,他引:0
Interactive displays are increasingly being distributed in a broad spectrum of everyday life environments: they have very
diverse form factors and portability characteristics, support a variety of interaction techniques, and can be used by a variable
number of people. The coupling of multiple displays creates an interactive “ecosystem of displays”. Such an ecosystem is suitable for particular social
contexts, which in turn generates novel settings for communication and performance and challenges in ownership. This paper
aims at providing a design space that can inform the designers of such ecosystems. To this end, we provide a taxonomy that
builds on the size of the ecosystem and on the degree of individual engagement as dimensions. We recognize areas where physical
constraints imply certain kinds of social engagement, versus other areas where further work on interaction techniques for
coupling displays can open new design spaces. 相似文献
7.
Filomena Impero Martin Dix Antonino Squillace Biagio Palumbo Flaviana Tagliaferri 《Materials and Manufacturing Processes》2018,33(12):1354-1360
This paper compares conventional and cryogenic cooling in the deep hole drilling of carbon fiber reinforced polymer (CFRP)/Ti stacks. Various parameters are taken into account to find if the use of cryogenic coolant is justified by the improvement of the final results. Both the thrust and the torque were acquired continuously during the machining operations and compared both in average and distribution. The use of a cryogenic coolant brings a reduction in thrust force and torque without any sensible drawback. Overall the results prove that cryogenic drilling is a suitable technology for CFRP/Ti stack drill. 相似文献
8.
Tristan Behrens Mehdi Dastani Jürgen Dix Michael Köster Peter Novák 《Annals of Mathematics and Artificial Intelligence》2010,59(3-4):277-311
The Multi-Agent Programming Contest is an annual international event on programming multi-agent systems: Teams of agents participate in a simulated cooperative scenario. It started in 2005 and is organised in 2010 for the sixth time. The contest is an attempt to stimulate research in the area of multi-agent system development and programming by (i) identifying key problems in the field and (ii) collecting suitable benchmarks that can serve as milestones for testing multi-agent programming languages, platforms and tools. This article provides a short history of the contest since it started and reports in more detail on the cows and cowboys scenario implemented for the 2008, 2009 and 2010 contest editions. We briefly discuss the underlying technological background and conclude with a critical discussion of the experiences and lessons learned. 相似文献
9.
Alternating-time temporal logic (atl) is a logic for reasoning about open computational systems and multi-agent systems. It is well known that atl model checking is linear in the size of the model. We point out, however, that the size of an atl model is usually exponential in the number of agents. When the size of models is defined in terms of states and agents rather than transitions, it turns out that the problem is (1) Δ
3
P
-complete for concurrent game structures, and (2) Δ
2
P
-complete for alternating transition systems. Moreover, for “Positive atl” that allows for negation only on the level of propositions, model checking is (1) Σ
2
P
-complete for concurrent game structures, and (2) NP-complete for alternating transition systems. We show a nondeterministic polynomial reduction from checking arbitrary alternating
transition systems to checking turn-based transition systems, We also discuss the determinism assumption in alternating transition
systems, and show that it can be easily removed.
In the second part of the paper, we study the model checking complexity for formulae of atl
with imperfect information (atl
ir
). We show that the problem is Δ
2
P
-complete in the number of transitions and the length of the formula (thereby closing a gap in previous work of Schobbens
in Electron. Notes Theor. Comput. Sci. 85(2), 2004). Then, we take a closer look and use the same fine structure complexity measure as we did for atl with perfect information. We get the surprising result that checking formulae of atl
ir
is also Δ
3
P
-complete in the general case, and Σ
2
P
-complete for “Positive atl
ir
”. Thus, model checking agents’ abilities for both perfect and imperfect information systems belongs to the same complexity
class when a finer-grained analysis is used. 相似文献
10.
Tristan M. Behrens Jürgen Dix 《Annals of Mathematics and Artificial Intelligence》2007,51(2-4):81-121
We introduce a class of Petri nets, simple logic Petri nets (SLPN), that are based on logical expressions. We show how this type of nets can be efficiently mapped into logic programs with negation: the corresponding answer sets describe interleaved executions of the underlying nets (Theorem 1). The absence of an answer set indicates a deadlock situation. We also show how to correctly model and specify AgentSpeak agents and multi-agent systems with SLPN’s (Theorem 2). Both theorems allow us to solve the task of model checking AgentSpeak multi-agent systems by computing answer sets of the obtained logic program with any ASP system. 相似文献