This volume contains a detailed, precise and clear semantic formalism designed to allow nonprogrammers such as linguists and literary specialists to represent elements of meaning which they must deal with in their research and teaching. It can be said that the issue with more influence along the project was the. First we define a semantic model for virtual environments populated by digital items virtual entities. Simulating socially intelligent agents in semantic virtual environments 3 version of an ontology for virtual humans is also introduced. Homepage of roland geraerts crowd simulation software. Semantic modeling of virtual environments using mascaret. In programming language theory, semantics is the field concerned with the rigorous mathematical study of the meaning of programming languages.
The virtual reality technology that can generate high quality ves has been introduced to many. Architecture of a virtual reality and semanticsbased. Investigation on semantics to improve the covax system. Semantic virtual environments for product design 25 computer engineering and informatics department the accuracy of the users movements for interaction or navigation dictates if a task can be performed successfully. Semanticsbased representation of virtual environments semanticsbased representation of virtual environments gutierrez, mario. Assessment and content authoring in semantic virtual environments.
Semanticsbased question generation and implementation are straightforward from a syntactic point of view. Semanticsbased representation of virtual environments semantic. In section 3, we pre sent our approach to creating an ivge from gis data. A software platform for semanticsbased enterprise knowledge. Indeed, if lis the set of all atomic entities and relations, fv returns a unique label for every v 2v, and fe always returns. Some test applications are described to demonstrate the benefits of the semanticsbased representation of interactive virtual environments, including autonomous characters and collaborative. Computer technology has only recently become advanced enough to solve the problems it creates with its own interface. Graphbased representations are extremely common in formal semantics jones et al. Semantic virtual environments semantic virtual environments otto, karsten a. Inclusive symbolic environments william bricken april 1994 abstract.
Semantics based question generation and implementation are straightforward from a syntactic point of view. Environment representation virtual environments and spatial representations have been used in several application domains. Interactive virtual environments are useful tools for handson learning or rehearsing of procedural tasks. Virtual reality vr is a medium that comes close to the way humans perceive information, reducing the impedance between the representation of the information and peoples conceptualizations of space and time. Abstract today s virtual environment ve systems share a number of issues with the htmlbased world wide web. This xmlbased ontology is aimed at modelling and animating the human body as well as at the interaction of virtual humans with smart objects kallmann and thalmann, 1999. Electrical and computer engineering, the university of british columbia, vancouver, canada v6t 1z4 2institute of system engineering, shanghai jiaotong university, shanghai, china 200052 3faculty of computer science, university of new brunswick. A collaborative 3d environment for authoring of design.
About the semantic representation of natural language. Bim based virtual environment for fire emergency evacuation. A semanticsbased multiagent framework for vehicular social network development xiping hu1, jidi zhao2, dizhi zhou3, victor c. The tools are engineered as a monolithic system in one address space, and the application program is embedded in the same address space. I believe we should be able to build and understand a full programming language semantics, endtoend, in 46 hours with a content going straight to the point, showed in live coding. A semanticsbased, active render framework to realize. In this paper we address the problem of knowledge management and. However, task training applications typically provide a constrained course of action for the learner, forcing them down a single specific solution path. Modeling and simulation framework for development of. An ontology for semantic representation of an urban virtual.
Distributed representations for compositional semantics. A semanticsbased, active render framework to realize complex. A software platform for semanticsbased enterprise knowledge management. Knowledge representation for virtual environments ve became an important issue with increasing interest in the last decade 1 2. Alignmentbased compositional semantics for instruction. An ontology for semantic representation of an urban. Virtual tours, are based on a rich semantic description of the environment and tasks that users. Attribute grammars define systems that systematically compute metadata called attributes for the various cases of the languages syntax. Assessment and content authoring in semantic virtual. Breys call for moreanalysis of ethical issues of virtual realityvr is continued by further analyzing issuesin a specialized domain of vr namelymultiuser environments. A further analysis of the ethics of representation in virtual. Semantic based virtual environments for product design antoniou efstratios am 4150. Knowledge representation formalisms and me thods semantic networks. Section 4 depicts a way to enhance the ivge information by automatically associating semantics with surfaces based on their boundaries.
Semantic virtual environments for product design 2 computer engineering and informatics department abstract nowadays virtual reality greatly assists in the testing of products and processes that do not yet exist or exist in a preliminary state. For virtual scenarios, this equates to having a meaningful semantic under. Graph based representations are extremely common in formal semantics jones et al. Were upgrading the acm dl, and would like your input. Vr continues to be an active research topic for different scientific communities e. A model for exploring virtual reality environments. Semanticsbased representation of virtual environments. On the contrary, our approach uses a topological model and provides an exact representation of gis data, allowing an accurate geometrical exploitation. New semanticsbased software tools that accelerate the speed companies can develop or adjust their processes while slashing costs have resulted from a major european research. Aug 07, 2009 new semantics based software tools that accelerate the speed companies can develop or adjust their processes while slashing costs have resulted from a major european research. Semantic modelling should provide a consistent representation of the. The objective is to enable agents to make decisions that are consistent with the semantic state of their environment. Many virtual reality vr applications, such as virtual learning.
A collaborative 3d environment for authoring of design semantics. The solution we propose is based on a semantic model aimed at representing the meaning, and functionality of objects in a virtual scene. Conventional vge approaches are generally built upon a grid based representation, raising the wellknown problems of the lack of accuracy of the localized data and the difficulty to merge data with multiple semantics. Currently, two impediments block widespread use of intelligent training tools for virtual environments. The idea is to model the interaction between the agents and the. One solution, virtual reality vr, immediately raises fundamental issues in both semantics and epistemology.
Semanticsbased approaches are less explored in previous research. In this paper, we present an object representation based on the semantics and functionality of interactive digital items virtual objects within a virtual. This xml based ontology is aimed at modelling and animating the human body as well as at the interaction of virtual humans with smart objects kallmann and thalmann, 1999. We propose an efficient physicsbased method for dexterous real handvirtual object interaction in virtual reality environments. In this paper, we propose a novel approach to automatically building informed virtual geographic environments ivge using data provided by geographic information systems gis. Several elements ofbreys article are critiqued in order to givemore. Semantic and virtual realityenhanced configuration of domestic. The graphics content and the semantics of the scenes are married into a consistent and cohesive ontological model while at the same time knowledge based techniques for the querying, manipulation, and seman. Distributional approachesmeaning distributed representations that exploit co. Our method is based on the coulomb friction model, and we show how to efficiently implement it in a commodity vr engine for realtime performance. Indeed, the agents operating in ve need semantic informations on it to adapt their behavior to identi. Section 6 shows the virtual learning environments used in the spanish universities. This paper presents hcsm, a framework for behavior and scenario control based on communicating hierarchical, concurrent state machines. Ai2 was founded to conduct highimpact research and engineering in the field of artificial intelligence.
Semantic scholar is a project at the allen institute for ai ai2. We study how we can automatically create a data structure that represents the walkable surfaces in virtual environments, and how it can be updated dynamically and efficiently when it changes. Actors, virtual humans, semantics and ontologies for virtual environments 1 introduction the utilizaion of semantics representation as a key component in the construction of virtual environments is a growing practice both in academia and industry, particularly as a means by which to afford virtual agents a greater form of autonomy 1. Kovalchuk 337 technology is extended to support dynamic rebuilding of systemas structural model, arrange a model state with related data according to domain semantics, and correct representation of systemas state during wf management. Using gis data to build informed virtual geographic. And all this is spread to a whole semester of messing with tokenizers and bnf grammars, without understanding an actual semantics of programming languages. Next, section 5 presents two addi tional information enhancements based on a geometrical. Virtual environments ves are threedimensional, computer generated environments that occur in the real world but can be manipulated by the endusers. In this paper we present mug, a collaborative 3d environment to support knowledgebased conceptual design. Semanticsbased question generation and implementation. This work integrates computeraided and collaborative design methods with representation framework being developed for the semantic web. Informed virtual geographic environments for knowledge.
Proceedings of the 5th joint virtual reality conference. Semantic based virtual environments for product design. Independent verification and validation of software semanticbased knowledge systems show promise. Semantics, ontology, virtual reality, product design, modular systems. The aim of this phase was to establish the way of performing the data integration, to assess the common representation schema and prepare conversion or adaptation procedures. Were funded by paul allen, microsoft cofounder, and led by dr. Virtual environments ves provide an appealing vehicle for training complex skills, particularly for domains where realworld practice incurs significant time, expense, or risk. Virtual environments are populated with virtual objects. Alignmentbased compositional semantics for instruction following. Informaticians working in this areabiomedical knowledge representation and semanticsare interested in knowledge representation techniques e.
Semanticsbased representation of virtual environments we consider every object participating in a ve application not only as a 3d shape, but as a dynamic entity with multiple visual representations and functionalities. Ve and not for code generation, as in classical software development process. The graphics content and the semantics of the scenes are married into a consistent and cohesive ontological model while at the same time knowledgebased techniques for the querying, manipulation, and seman. We describe the needs and benefits of using a semanticsbased representation for. It also exploits virtual reality technologies as an efficient means to simplify the. Semanticsbased representation of virtual environments article pdf available in international journal of computer applications in technology 232. Semantic instrumentation of virtual environments for training. Section 4 describes in detail the semantic knowledge base, backbone of the d4all. We consider every object participating in a ve application not only as a 3d shape, but as a dynamic entity with multiple visual representations and functionalities. The obtained ivge provides 2d and 3d geographic information for visualization and simulation purposes. Semantics based approaches are less explored in previous research.
Track and improve business slas instead of monitoring infrastructure alerts. Simulating socially intelligent agents in semantic virtual. Generating semantic information for virtual environments. Algebraic semantics is a form of axiomatic semantics based on algebraic laws for describing and reasoning about program semantics in a formal manner. A performance test comparison between moodle and sakai is shown in section 7.
An infrastructure is presented for semantic virtual environments sves that is based on an extensible ontology, together with a set of software components that facilitate the creation and. Without providing formal semantics, we provide enough detail to implement the state machines and an execution engine to run. It does so by evaluating the meaning of syntactically valid strings defined by a specific programming language, showing the computation involved. Knowledge representation incorporates findings from psychology about how humans solve problems.
The vso modeling and simulation for interactive virtual environments k. Semantic modelling of interactive 3d content with domainspecific. Conventional vge approaches are generally built upon a gridbased representation, raising the wellknown problems. A semanticsbased multiagent framework for vehicular. Allbeck2 abstractin order to build virtual humans with pleasing interactions in virtual scenarios, a consistent representation of all relevant relations and information is required.
Semantics based representation of virtual environments. Thalmannsemanticsbased representation of virtual environments. In this paper we address the problem of knowledge management and interoperability in virtual enterprise environments where knowledge is often fragmented and heterogeneous. A semantically rich object representation, therefore, goes beyond its basic.
Coupling ontologies with graphics content for knowledge. In this work, we have created a unique environment that allows a group of users, working together over. Applied to virtual environments, we define semantics as the information conveying. We discuss an approach in which the virtual environment is semantically instrumented in order to allow for the tracking of and reasoning about openended learner activity therein. The mathematical representation of semantics is a key issue for natural language processing nlp. Pdf an infrastructure for semantic virtual environments.
The flavor of the experience that the user has while using the system. In such a case that the evaluation would be of syntactically invalid strings, the result would be non. This model is embodied into a more global system simulating a virtual city. The representation is based on semantic web standards and ontologies, which enable use of general as well as domain knowledge for exploration of content. Our approach leverages ontology based knowledge representation which allows for a structured and meaningful description of virtual. Pdf semanticsbased representation of virtual environments. A further analysis of the ethics of representation in.
In this paper we present mug, a collaborative 3d environment to support knowledge based conceptual design. Jan 01, 2005 in this paper, we present an object representation based on the semantics and functionality of interactive digital items virtual objects within a virtual environment ve. Generating semantic information for virtual environments j. This allows for dynamically scaling and adapting the. The knowledge base has been developed using the software protege 48. Industry leading automated crossteam collaboration and root cause analytics are key to our solution. May 10, 2005 semantic virtual environments semantic virtual environments otto, karsten a.
Alternatively, architecturedependent binary code can be lifted to an intermediate representation that can be at least partially executed into a symbolic virtual machine, but that. We specify the structure and an operational execution model of hcsms state machines. Ve a virtual environment is a dynamic spacetime region that consists of objects that bear spatial and temporal relations to one another and whose identity conditions supervene on the actual or possible sensory and cognitive states of the agents who inhabit that environment. We describe the needs and benefits of using a semantics based representation for. In this paper we present an object representation based on the semantics and functionality of interactive digital items virtual objects within a virtual environment ve. To support the rapid production of software for research prototypes, interlisp uses a large virtual memory space, for example. Semantic web technologies have proved to be an efficient way to represent the.
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