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2000

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Articles 31 - 34 of 34

Full-Text Articles in Engineering

Editing Mpeg2 Video In Compressed Domain, Ren Egawa Jan 2000

Editing Mpeg2 Video In Compressed Domain, Ren Egawa

Theses

As MPEG2 becomes the heart of most digital video applications, the need to edit an MPEG2 bitstream video in compressed domain has increased. To realize this need, two major technical issues must be resolved: decoder buffer and segment extraction.

In the decoder buffer issue, the edited stream must ensure that the buffer would not overflow or underfiow as the result of the editing. This thesis invented a mathematical model that could describe the editing task and predict the editing effect on the buffer. Based on this model, the thesis then built a method to edit a stream safely. This method …


Measurement Of Microcarrier Weighted Floc Using The Environmental Electron Microscope, Viriya Vithayaveroj Jan 2000

Measurement Of Microcarrier Weighted Floc Using The Environmental Electron Microscope, Viriya Vithayaveroj

Theses

Utilizing the concept of coagulation in conjunction with the sediment enhancement by microcarrier, the microcarrier process has been demonstrated in a laboratory investigation as an effective and economic operation in removing colloidal particles in an aquatic system. The microcarrier, an inert aluminum silicate particulate (Ottawa Sand) of 53 to 75 micrometers in diameter was used in this study. The interaction between the flocs and the microcarriers plays an important role in the mixing process. The principal objective of this study is to examine the structural interaction between the flocs and the microcarrier.

The study was designed into two stages, the …


The Development Of Design And Test Methodologies For Hovercraft, John Cronin Jan 2000

The Development Of Design And Test Methodologies For Hovercraft, John Cronin

Theses

This project is concerned with the development of design and test methodologies for hovercraft.

Full-scale hovercraft field-testing is to be achieved through the dedicated re-design and re-construction of the ABl11Crossbow hovercraft. The Crossbow hovercraft is an experimental craft, which was built in England in the early seventies. The Crossbows re-design focuses on the production of a versatile craft, which is capable of modification to produce a variety of different operating conditions. The re-design and re-construction comprises several distinct areas. An improved and adjustable lift and thrust system is designed. The design and manufacture of a new more stable and versatile …


Security In Distributed Systems - A Framework For Different Application Types, Ingo Stengel Jan 2000

Security In Distributed Systems - A Framework For Different Application Types, Ingo Stengel

Theses

Security is a factor which decides upon the applicability of distributed applications. Therefore this thesis deals with security in distributed systems. The complexity of the existing distributed technologies makes it necessary to reduce the number of distributed technologies considered in this thesis, i.e. concentrating on: Java, Mobile Agents and CORBA, where only Java-based mobile agents will be considered.

After a short review of basic security principles including firewalls, existing security problems in the above mentioned distributed technologies are analysed. Additional generic problems in distributed systems are outlined.

Solutions are referring to two different areas: those regarding security problems with firewalls …