scholarly journals The 3rd International Planning Competition: Results and Analysis

2003 ◽  
Vol 20 ◽  
pp. 1-59 ◽  
Author(s):  
D. Long ◽  
M. Fox

This paper reports the outcome of the third in the series of biennial international planning competitions, held in association with the International Conference on AI Planning and Scheduling (AIPS) in 2002. In addition to describing the domains, the planners and the objectives of the competition, the paper includes analysis of the results. The results are analysed from several perspectives, in order to address the questions of comparative performance between planners, comparative difficulty of domains, the degree of agreement between planners about the relative difficulty of individual problem instances and the question of how well planners scale relative to one another over increasingly difficult problems. The paper addresses these questions through statistical analysis of the raw results of the competition, in order to determine which results can be considered to be adequately supported by the data. The paper concludes with a discussion of some challenges for the future of the competition series.

2006 ◽  
Vol 25 ◽  
pp. 187-231 ◽  
Author(s):  
A. Gerevini ◽  
A. Saetti ◽  
I. Serina

The treatment of exogenous events in planning is practically important in many real-world domains where the preconditions of certain plan actions are affected by such events. In this paper we focus on planning in temporal domains with exogenous events that happen at known times, imposing the constraint that certain actions in the plan must be executed during some predefined time windows. When actions have durations, handling such temporal constraints adds an extra difficulty to planning. We propose an approach to planning in these domains which integrates constraint-based temporal reasoning into a graph-based planning framework using local search. Our techniques are implemented in a planner that took part in the 4th International Planning Competition (IPC-4). A statistical analysis of the results of IPC-4 demonstrates the effectiveness of our approach in terms of both CPU-time and plan quality. Additional experiments show the good performance of the temporal reasoning techniques integrated into our planner.


2013 ◽  
Vol 275-277 ◽  
pp. 2570-2578
Author(s):  
Nurbol Luktarhan ◽  
Nan Nan Xie ◽  
Muheyatn Niyazbek ◽  
Jin Shan He

Automated Planning is a very important branch of Artificial Intelligence, and one of the top competitions of Automated Planning is International Planning Competition, which is held by International Conference on Automated Planning and Scheduling. This paper gives the concepts about planning domains, and lists the sources of planning domains of IPC. Then from the aspects of application, the planning domains used in IPC are classified to three parts, theoretical research domains, application-oriented domains and comprehensive domains. And application-oriented domains are divided into five groups: robots-related domains, astronomy domains, engineering domains, games domains and network-related domains. Combining with the development of planning domains in 6 sessions of IPC, potential trends of the development of planning domains are explored.


2005 ◽  
Vol 24 ◽  
pp. 581-621 ◽  
Author(s):  
A. Botea ◽  
M. Enzenberger ◽  
M. Mueller ◽  
J. Schaeffer

Despite recent progress in AI planning, many benchmarks remain challenging for current planners. In many domains, the performance of a planner can greatly be improved by discovering and exploiting information about the domain structure that is not explicitly encoded in the initial PDDL formulation. In this paper we present and compare two automated methods that learn relevant information from previous experience in a domain and use it to solve new problem instances. Our methods share a common four-step strategy. First, a domain is analyzed and structural information is extracted, then macro-operators are generated based on the previously discovered structure. A filtering and ranking procedure selects the most useful macro-operators. Finally, the selected macros are used to speed up future searches. We have successfully used such an approach in the fourth international planning competition IPC-4. Our system, Macro-FF, extends Hoffmann's state-of-the-art planner FF 2.3 with support for two kinds of macro-operators, and with engineering enhancements. We demonstrate the effectiveness of our ideas on benchmarks from international planning competitions. Our results indicate a large reduction in search effort in those complex domains where structural information can be inferred.


AI Magazine ◽  
2010 ◽  
Vol 31 (1) ◽  
pp. 95
Author(s):  
Roman Bartak ◽  
Simone Fratini ◽  
Lee McCluskey

We report on the staging of the third competition on knowledge engineering for AI planning and scheduling systems, held during ICAPS-09 at Thessaloniki, Greece in September 2009. We give an overview of how the competition has developed since its first run in 2005, and its relationship with the AI planning field. This run of the competition focused on translators that when input with some formal description in an application-area-specific language, output solver-ready domain models. Despite a fairly narrow focus within knowledge engineering, seven teams took part in what turned out to be a very interesting and successful competition.


2004 ◽  
Vol 34 (136) ◽  
pp. 455-468
Author(s):  
Hartwig Berger

The article discusses the future of mobility in the light of energy resources. Fossil fuel will not be available for a long time - not to mention its growing environmental and political conflicts. In analysing the potential of biofuel it is argued that the high demands of modern mobility can hardly be fulfilled in the future. Furthermore, the change into using biofuel will probably lead to increasing conflicts between the fuel market and the food market, as well as to conflicts with regional agricultural networks in the third world. Petrol imperialism might be replaced by bio imperialism. Therefore, mobility on a solar base pursues a double strategy of raising efficiency on the one hand and strongly reducing mobility itself on the other.


Author(s):  
Alaa Taleb Khalaf

The present research aims at arriving the motives of the Russian intervention in the Syrian crisis, in the first section, As well as the positions of regional and international countries in favor of this intervention and opposition to it, in the second section, And the out looking of the future of this intervention and keeping an open crisis in Syria by posing future scenarios and the likelihood of one of them, and the jungle in the third section.


Author(s):  
Loreta De Stasio

En este artículo examinaremos algunas de las principales estrategias discursivas empleadas en dos artículos publicados por U. Eco en L’Espresso, una revista semanal muy conocida en Italia de carácter político, social, cultural y económico, en el marco de una página personal titulada “La Bustina di Minerva”, es decir, “El Sobrecito de Minerva”. El título es una referencia a la comunicación breve, a las observaciones de cualquier tipo, pero igualmente, de forma simultánea. Los sobrecitos reflexionan sobre el mundo contemporáneo, la sociedad italiana, los medios de comunicación de masas; tratan de la actualidad y la relacionan con la historia y la filosofía, con Internet y el futuro del Tercer Milenio, y nos proponen los pensamientos de U. Eco con más viveza que una conferencia o un tratado.La ironía, la sátira y la parodia son las bases argumentativas de muchos “Sobrecitos”. Generalmente, el humor transmite dos sentidos a la vez. Detrás de una serie de textos tan variados temáticamente aparece a menudo una misma estructura binaria, un cuerpo dual. Con frecuencia, un mismo artículo obedece a una doble orientación tematica, ya que suelen mezclar dos motivos que pertenecen a áreas diferentes, alternando simultáneamente dos sujetos. A esta doble orientación temática del “Sobrecito” corresponde la doble orientación semántica de la palabra irónica que, junto con la parodia es un discurso dialógico o bi-direccional en el que se mezclan dos voces.In this article some of the main discursive strategies used in two articles published by U. Eco are examined. These articles have been published in L'Espresso, a weekly review very widespread in Italy, of political, social, cultural and economic character, within the framework of a column titled “La Bustina di Minerva”, that is to say, “The little bag/envelope of Minerva”. This title refers to a brief communication, to observations of any type, but also, immediate. The “bustine” reflects on the contemporary world, the Italian society, the mass media; they deal with present time and relate it to history and philosophy, Internet and the future of the Third Millennium, and they propose us Eco’s thoughts with more vividness than a conference or an essay.Irony, satire and parody are the argumentative bases of many “bustine”. Generally, humour transmits two senses simultaneously. Behind a series of texts so thematically varied there is often a same binary structure, a dual body. Frequently, a same article obeys to a double thematic direction, since usually they mix two arguments that belong to different areas, alternating two subjects simultaneously. To this double thematic direction of the “bustina” corresponds the double semantic direction of the ironic word that, along with parody, is a dialogic or bidirectional speech in which two voices are mixed.


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