Ontwerp van 'n multimedia-studiepakket vir die afstandsonderrig van gerekenariseerde inligtingsherwinning.
- Authors: Fourie, Ina
- Date: 2014-11-20
- Subjects: Distance education - Computer-assisted instruction , Information science - Study and teaching (Higher) - South Africa , Multimedia systems , Information storage and retrieval systems - Automation
- Type: Thesis
- Identifier: uj:13062 , http://hdl.handle.net/10210/12942
- Description: D.Litt. et Phil. (Information Science) , The project involved the design of a multimedia study package for distance teaching in computerised information retrieval. This included external online and CD-ROM informa- tion retrieval, as well as specialized systems such as in-house databases, videotex, teletext and Internet. The target group was information specialists. The findings may also apply to other target groups, provided a thorough situation analysis serves as point of departure. The project was initiated by the growing importance of distance education, the constant developments in the online industry and the need for didactically grounded study packages for teaching computerised information retrieval skills. Such packages should focus on technological knowledge and skills on the higher cognitive, affective and psychomotor levels. A literature study was conducted on four subproblems: the nature of distance education; the characteristics of multimedia study packages; the didactical grounding of such packages (including curriculum development, instructional design and media selection); and the state of the art regarding the 'teaching of computerised information retrieval. This led to the conclusion that the theory of distance education should serve as focal point in the design of a multimedia package, while special attention is also given to Keegan's theory which focuses on the reintegration of the teaching and learning acts. Study packages should be the result of instructional design, which is dependent on curriculum development. The latter includes decisions made on the macro and meso levels of the curriculum and the consideration of technological infrastructures available in the wider society. Provision should also be made for the typical characteristics of multimedia packages for distance teaching, including individual study, irregular contact teaching sessions, active student involvement, opportunities for self-evaluation, enriching and remedial learning events, student support and the recognition of the needs of adult learners (andragogical needs), as well as those of young adults. The mastering of higher order skills should be supported by opportunities for active student involvement including self-evaluation of lower order skills. Provision should also be made 1I1 for the practical application of knowledge and skills, as welI as evaluation skills, by fully exploiting the possibilities offered by interactive teaching. Students should, however, attend interactive sessions welI prepared. This could be ensured by making use of prior self- evaluation as well as tutor evaluation of both subject matter and media literacy. A variety of media and teaching methods can be applied in the mediated teaching of computerised information retrieval. Media selection should be based on media character- istics, performance objectives, subject nature and logistical factors. An eclectic model for instructional design is proposed. A concept design for a multimedia package for distance teaching of computerised information retrieval was developed by applying this eclectic model. The concept design was based on the didactical situation at the University of South Africa. Although the design has focused on the ideal situation, where students have access to computers and attend sporadic contact teaching sessions, suggestions are also made for a differentiated package. These suggestions include a basic study package, a learning contract with the student and his employee, and a package with enriched learning experience.
- Full Text:
- Authors: Fourie, Ina
- Date: 2014-11-20
- Subjects: Distance education - Computer-assisted instruction , Information science - Study and teaching (Higher) - South Africa , Multimedia systems , Information storage and retrieval systems - Automation
- Type: Thesis
- Identifier: uj:13062 , http://hdl.handle.net/10210/12942
- Description: D.Litt. et Phil. (Information Science) , The project involved the design of a multimedia study package for distance teaching in computerised information retrieval. This included external online and CD-ROM informa- tion retrieval, as well as specialized systems such as in-house databases, videotex, teletext and Internet. The target group was information specialists. The findings may also apply to other target groups, provided a thorough situation analysis serves as point of departure. The project was initiated by the growing importance of distance education, the constant developments in the online industry and the need for didactically grounded study packages for teaching computerised information retrieval skills. Such packages should focus on technological knowledge and skills on the higher cognitive, affective and psychomotor levels. A literature study was conducted on four subproblems: the nature of distance education; the characteristics of multimedia study packages; the didactical grounding of such packages (including curriculum development, instructional design and media selection); and the state of the art regarding the 'teaching of computerised information retrieval. This led to the conclusion that the theory of distance education should serve as focal point in the design of a multimedia package, while special attention is also given to Keegan's theory which focuses on the reintegration of the teaching and learning acts. Study packages should be the result of instructional design, which is dependent on curriculum development. The latter includes decisions made on the macro and meso levels of the curriculum and the consideration of technological infrastructures available in the wider society. Provision should also be made for the typical characteristics of multimedia packages for distance teaching, including individual study, irregular contact teaching sessions, active student involvement, opportunities for self-evaluation, enriching and remedial learning events, student support and the recognition of the needs of adult learners (andragogical needs), as well as those of young adults. The mastering of higher order skills should be supported by opportunities for active student involvement including self-evaluation of lower order skills. Provision should also be made 1I1 for the practical application of knowledge and skills, as welI as evaluation skills, by fully exploiting the possibilities offered by interactive teaching. Students should, however, attend interactive sessions welI prepared. This could be ensured by making use of prior self- evaluation as well as tutor evaluation of both subject matter and media literacy. A variety of media and teaching methods can be applied in the mediated teaching of computerised information retrieval. Media selection should be based on media character- istics, performance objectives, subject nature and logistical factors. An eclectic model for instructional design is proposed. A concept design for a multimedia package for distance teaching of computerised information retrieval was developed by applying this eclectic model. The concept design was based on the didactical situation at the University of South Africa. Although the design has focused on the ideal situation, where students have access to computers and attend sporadic contact teaching sessions, suggestions are also made for a differentiated package. These suggestions include a basic study package, a learning contract with the student and his employee, and a package with enriched learning experience.
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Secure multimedia databases.
- Authors: Pedroncelli, Antony
- Date: 2008-06-02T13:08:07Z
- Subjects: Multimedia systems , access control , computer security , data protection , databases
- Type: Thesis
- Identifier: uj:8748 , http://hdl.handle.net/10210/509
- Description: A message can be communicated to other people using a combination of pictures, sounds, and actions. Ensuring that the message is understood as intended often depends on the presentation of these forms of multimedia. In today’s digital world, traditional multimedia artefacts such as paintings, photographs, audiotapes and videocassettes, although still used, are gradually being replaced with a digital equivalent. It is normally easy to duplicate these digital multimedia files, and they are often available within public repositories. Although this has its advantages, security may be a concern, especially for sensitive multimedia data. Information security services such as identification and authentication, authorisation, and confidentiality can be implemented to secure the data at the file level, ensuring that only authorised entities gain access to the entire multimedia file. It may not always be the case however that a message must be conveyed in the same way for every entity (user or program) that makes a request for the multimedia data. Although access control measures can be ensured for the multimedia at the file level, very little work has been done to ensure access control for multimedia at the content level. A number of models will be presented in this dissertation that should ensure logical access control at the content level for the three main types of multimedia, namely images, audio, and video. In all of these models, the multimedia data is securely stored in a repository, while the associated security information is stored in a database. The objects that contain the authorisation information are created through an interface that securely communicates with the database. Requests are made through another secure interface, where only the authorised multimedia data will be assembled according to the requesting entity’s security classification. Certain important side issues concerning the secure multimedia models will also be discussed. This includes security issues surrounding the model components and suspicion i.e. reducing the probability that a requesting entity would come to the conclusion that changes were made to the original multimedia data. , Prof. M.S. Olivier
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- Authors: Pedroncelli, Antony
- Date: 2008-06-02T13:08:07Z
- Subjects: Multimedia systems , access control , computer security , data protection , databases
- Type: Thesis
- Identifier: uj:8748 , http://hdl.handle.net/10210/509
- Description: A message can be communicated to other people using a combination of pictures, sounds, and actions. Ensuring that the message is understood as intended often depends on the presentation of these forms of multimedia. In today’s digital world, traditional multimedia artefacts such as paintings, photographs, audiotapes and videocassettes, although still used, are gradually being replaced with a digital equivalent. It is normally easy to duplicate these digital multimedia files, and they are often available within public repositories. Although this has its advantages, security may be a concern, especially for sensitive multimedia data. Information security services such as identification and authentication, authorisation, and confidentiality can be implemented to secure the data at the file level, ensuring that only authorised entities gain access to the entire multimedia file. It may not always be the case however that a message must be conveyed in the same way for every entity (user or program) that makes a request for the multimedia data. Although access control measures can be ensured for the multimedia at the file level, very little work has been done to ensure access control for multimedia at the content level. A number of models will be presented in this dissertation that should ensure logical access control at the content level for the three main types of multimedia, namely images, audio, and video. In all of these models, the multimedia data is securely stored in a repository, while the associated security information is stored in a database. The objects that contain the authorisation information are created through an interface that securely communicates with the database. Requests are made through another secure interface, where only the authorised multimedia data will be assembled according to the requesting entity’s security classification. Certain important side issues concerning the secure multimedia models will also be discussed. This includes security issues surrounding the model components and suspicion i.e. reducing the probability that a requesting entity would come to the conclusion that changes were made to the original multimedia data. , Prof. M.S. Olivier
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The effects of evaluation and rotation on descriptors and similarity measures for a single class of image objects
- Authors: Loots, Conrad
- Date: 2008-06-06T10:32:17Z
- Subjects: Multimedia systems , Information storage and retrieval systems , JPEG (image coding standard) , MPEG (video coding standard) , Image processing
- Type: Thesis
- Identifier: uj:9199 , http://hdl.handle.net/10210/564
- Description: “A picture is worth a thousand words”. If this proverb were taken literally we all know that every person interprets images or photos differently in terms of its content. This is due to the semantics contained in these images. Content-based image retrieval has become a vast area of research in order to successfully describe and retrieve images according to the content. In military applications, intelligence images such as those obtained by the defence intelligence group are taken (mostly on film), developed and then manually annotated thereafter. These photos are then stored in a filing system according to certain attributes such as the location, content etc. To retrieve these images at a later stage might take days or even weeks to locate. Thus, the need for a digital annotation system has arisen. The images of the military contain various military vehicles and buildings that need to be detected, described and stored in a database. For our research we want to look at the effects that the rotation and elevation angle of an object in an image has on the retrieval performance. We chose model cars in order to be able to control the environment the photos were taken in such as the background, lighting, distance between the objects, and the camera etc. There are also a wide variety of shapes and colours of these models to obtain and work with. We look at the MPEG-7 descriptor schemes that are recommended by the MPEG group for video and image retrieval as well as implement three of them. For the military it could be required that when the defence intelligence group is in the field, that the images be directly transmitted via satellite to the headquarters. We have therefore included the JPEG2000 standard which gives a compression performance increase of 20% over the original JPEG standard. It is also capable to transmit images wirelessly as well as securely. Including the MPEG-7 descriptors that we have implemented, we have also implemented the fuzzy histogram and colour correlogram descriptors. For our experimentation we implemented a series of experiments in order to determine the effects that rotation and elevation has on our model vehicle images. Observations are made when each vehicle is considered separately and when the vehicles are described and combined into a single database. After the experiments are done we look at the descriptors and determine which adjustments could be made in order to improve the retrieval performance thereof. , Dr. W.A. Clarke
- Full Text:
- Authors: Loots, Conrad
- Date: 2008-06-06T10:32:17Z
- Subjects: Multimedia systems , Information storage and retrieval systems , JPEG (image coding standard) , MPEG (video coding standard) , Image processing
- Type: Thesis
- Identifier: uj:9199 , http://hdl.handle.net/10210/564
- Description: “A picture is worth a thousand words”. If this proverb were taken literally we all know that every person interprets images or photos differently in terms of its content. This is due to the semantics contained in these images. Content-based image retrieval has become a vast area of research in order to successfully describe and retrieve images according to the content. In military applications, intelligence images such as those obtained by the defence intelligence group are taken (mostly on film), developed and then manually annotated thereafter. These photos are then stored in a filing system according to certain attributes such as the location, content etc. To retrieve these images at a later stage might take days or even weeks to locate. Thus, the need for a digital annotation system has arisen. The images of the military contain various military vehicles and buildings that need to be detected, described and stored in a database. For our research we want to look at the effects that the rotation and elevation angle of an object in an image has on the retrieval performance. We chose model cars in order to be able to control the environment the photos were taken in such as the background, lighting, distance between the objects, and the camera etc. There are also a wide variety of shapes and colours of these models to obtain and work with. We look at the MPEG-7 descriptor schemes that are recommended by the MPEG group for video and image retrieval as well as implement three of them. For the military it could be required that when the defence intelligence group is in the field, that the images be directly transmitted via satellite to the headquarters. We have therefore included the JPEG2000 standard which gives a compression performance increase of 20% over the original JPEG standard. It is also capable to transmit images wirelessly as well as securely. Including the MPEG-7 descriptors that we have implemented, we have also implemented the fuzzy histogram and colour correlogram descriptors. For our experimentation we implemented a series of experiments in order to determine the effects that rotation and elevation has on our model vehicle images. Observations are made when each vehicle is considered separately and when the vehicles are described and combined into a single database. After the experiments are done we look at the descriptors and determine which adjustments could be made in order to improve the retrieval performance thereof. , Dr. W.A. Clarke
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