717 research outputs found
DESIGNING HYPERMEDIA APPLICATIONS
We describe a step-by-step methodology for the design and construction of hypermedia applications and illustrate our approach using a small application. The Relationship Management Design (RMD) methodology begins with a data model of the application domain and proceeds through the design of the hypertext network, user interface and run-time dynamics finally concluding with the construction and testing of the target hypermedia system. Our ultimate objective is to use the RMD approach as the basis for the construction of computerized tools to support the design and development of hypermedia applications.Information Systems Working Papers Serie
Characterization of wavelength interleaving in radio-over-fiber systems employing WDM/SCM
A radio-over-fiber (RoF) distribution system incorporating both sub-carrier multiplexing and wavelength division multiplexing (WDM) technologies is presented. This signal is directly modulated onto three high-speed lasers. Bragg filters are employed at the receiver base station in order to both demultiplex the required optical channel, and ensure that the detected signal is single side band (in order to overcome dispersion limitations of the link). System spectral efficiency is optimised by wavelength interleaving. The channel spacing between the WDM channels is varied and the system performance for different values of channel spacing and spectral efficiencies is investigated. The results show that wavelength interleaving is a reliable technique that could be used to increase the spectral efficiency of RoF systems
HYPER MODEL MANAGEMENT SYSTEMS
In this paper we study the integration of Model
Management and Hypertext systems to produce a Hyper
Model Management System (HMMS). Model Management
Systems constitute a class of software that
is designed to support the construction, storage, retrieval,
and use of models in the context of decision
support systems (DSS). Hypertext systems allow users
to split information into data fragments which the user
cart browse to find information by taking non-linear
paths in computer based texts. It has been suggested
that DSSs should be conceived as environments which
support decision making. We support the view that
such environments can be readily provided for the subtask
of model management by hypertext systems. The
different kinds of model knowledge can be captured
within different types of hypertext nodes and the relationships
among these can be maintained by hypertext
links. In this paper we describe some aspects of
model management where hypertext will have a significant
impact. However, plain hypertext is ineffective
in dealing with the dynamic nature of information in
model management tasks where data is revised, models
executed, and reports are created on the fly. Dynamic
domains require dynamic hypertexts. In this paper we
also study the requirements for dynamic hypertexts.
These can be satisfied within the class of generalized
hypertext systems by using special hypertext nodes and
links which we describe. We explore different architectures
to integrate MMS and Hypertext systems to
obtain HMMSs. This paper emphasizes the need for a
shift to integrating Model Management and hypertext
technologies.Information Systems Working Papers Serie
HYPER MODEL MANAGEMENT SYSTEMS
In this paper we study the integration of Model Management and Hypertext systems to
produce a Hyper Model Management System (HMMS). Model Management Systems constitute
a class of software that is designed to support the construction, storage, retrieval, and
use of models in the context of decision support systems (DSS). Hypertext systems allow
users to split information into data fragments which the user can browse to find information
by taking non-linear paths in computer based texts. It has been suggested that DSSs
should be conceived as environments which support decision making. We support the view
that such environments can be readily provided for the subtask of model management by
hypertext systems. The different kinds of model knowledge can be captured within different
types of nodes and the relationships among these can be maintained by hypertext links.
In this paper we describe some aspects of model management where hypertext will have
a significant impact. However, plain hypertext is ineffective in dealing with the dynamic
nature of information in model management tasks where data is revised, models executed,
and reports are created on the fly. Dynamic domains require dynamic hypertexts. In this
paper we also study the requirements for dynamic hypertexts. These can be satisfied within
the class of generalized hypertext systems by using special hypertext nodes and links which
we describe. We explore different architectures to integrate MMS and Hypertext systems to
obtain HMMSs. This paper emphasizes the need for a shift to integrated Model Management
environments and proposes hypertext as an integrating technology.Information Systems Working Papers Serie
Observation of Precipitation Evolution in Fe-Ni-Mn-Ti-Al Maraging Steel by Atom Probe Tomography
We describe the full decomposition sequence in an Fe-Ni-Mn-Ti-Al maraging steel during isothermal annealing at 550 °C. Following significant pre-precipitation clustering reactions within the supersaturated martensitic solid solution, (Ni,Fe)3Ti and (Ni,Fe)3(Al,Mn) precipitates eventually form after isothermal aging for ~60 seconds. The morphology of the (Ni,Fe)3Ti particles changes gradually during aging from predominantly plate-like to rod-like, and, importantly, Mn and Al were observed to segregate to these precipitate/matrix interfaces. The (Ni,Fe)3(Al,Mn) precipitates occurred at two main locations: uniformly within the matrix and at the periphery of the (Ni,Fe)3Ti particles. We relate this latter mode of precipitation to the Mn-Al segregation
DESIGNING HYPERMEDIA APPLICATIONS
We describe a step-by-step methodology for the design and construction of hypermedia applications and illustrate our approach using a small application. The Relationship Management Design (RMD) methodology begins with a data model of the application domain and proceeds through the design of the hypertext network, user interface and run-time dynamics finally concluding with the construction and testing of the target hypermedia system. Our ultimate objective is to use the RMD approach as the basis for the construction of computerized tools to support the design and development of hypermedia applications.Information Systems Working Papers Serie
HYPER MODEL MANAGEMENT SYSTEMS
In this paper we study the integration of Model
Management and Hypertext systems to produce a Hyper
Model Management System (HMMS). Model Management
Systems constitute a class of software that
is designed to support the construction, storage, retrieval,
and use of models in the context of decision
support systems (DSS). Hypertext systems allow users
to split information into data fragments which the user
cart browse to find information by taking non-linear
paths in computer based texts. It has been suggested
that DSSs should be conceived as environments which
support decision making. We support the view that
such environments can be readily provided for the subtask
of model management by hypertext systems. The
different kinds of model knowledge can be captured
within different types of hypertext nodes and the relationships
among these can be maintained by hypertext
links. In this paper we describe some aspects of
model management where hypertext will have a significant
impact. However, plain hypertext is ineffective
in dealing with the dynamic nature of information in
model management tasks where data is revised, models
executed, and reports are created on the fly. Dynamic
domains require dynamic hypertexts. In this paper we
also study the requirements for dynamic hypertexts.
These can be satisfied within the class of generalized
hypertext systems by using special hypertext nodes and
links which we describe. We explore different architectures
to integrate MMS and Hypertext systems to
obtain HMMSs. This paper emphasizes the need for a
shift to integrating Model Management and hypertext
technologies.Information Systems Working Papers Serie
HYPER MODEL MANAGEMENT SYSTEMS
In this paper we study the integration of Model Management and Hypertext systems to
produce a Hyper Model Management System (HMMS). Model Management Systems constitute
a class of software that is designed to support the construction, storage, retrieval, and
use of models in the context of decision support systems (DSS). Hypertext systems allow
users to split information into data fragments which the user can browse to find information
by taking non-linear paths in computer based texts. It has been suggested that DSSs
should be conceived as environments which support decision making. We support the view
that such environments can be readily provided for the subtask of model management by
hypertext systems. The different kinds of model knowledge can be captured within different
types of nodes and the relationships among these can be maintained by hypertext links.
In this paper we describe some aspects of model management where hypertext will have
a significant impact. However, plain hypertext is ineffective in dealing with the dynamic
nature of information in model management tasks where data is revised, models executed,
and reports are created on the fly. Dynamic domains require dynamic hypertexts. In this
paper we also study the requirements for dynamic hypertexts. These can be satisfied within
the class of generalized hypertext systems by using special hypertext nodes and links which
we describe. We explore different architectures to integrate MMS and Hypertext systems to
obtain HMMSs. This paper emphasizes the need for a shift to integrated Model Management
environments and proposes hypertext as an integrating technology.Information Systems Working Papers Serie
Approaching Petavolts per meter plasmonics using structured semiconductors
A new class of strongly excited plasmonic modes that open access to
unprecedented Petavolts per meter electromagnetic fields promise wide-ranging,
transformative impact. These modes are constituted by large amplitude
oscillations of the ultradense, delocalized free electron Fermi gas which is
inherent in conductive media. Here structured semiconductors with appropriate
concentration of n-type dopant are introduced to tune the properties of the
Fermi gas for matched excitation of an electrostatic, surface "crunch-in"
plasmon using readily available electron beams of ten micron overall dimensions
and hundreds of picoCoulomb charge launched inside a tube. Strong excitation
made possible by matching results in relativistic oscillations of the Fermi
electron gas and uncovers unique phenomena. Relativistically induced ballistic
electron transport comes about due to relativistic multifold increase in the
mean free path. Acquired ballistic transport also leads to unconventional heat
deposition beyond the Ohm's law. This explains the absence of observed damage
or solid-plasma formation in experiments on interaction of conductive samples
with electron bunches shorter than . Furthermore,
relativistic momentum leads to copious tunneling of electron gas allowing it to
traverse the surface and crunch inside the tube. Relativistic effects along
with large, localized variation of Fermi gas density underlying these modes
necessitate the kinetic approach coupled with particle-in-cell simulations.
Experimental verification of acceleration and focusing of electron beams
modeled here using tens of Gigavolts per meter fields excited in semiconductors
with free electron density will pave the way for Petavolts
per meter plasmonics.Comment: 16 pages, 10 figure
Profiling a decade of information systems frontiersâ research
This article analyses the first ten years of research published in the Information Systems Frontiers (ISF) from 1999 to 2008. The analysis of the published material includes examining variables such as most productive authors, citation analysis, universities associated with the most publications, geographic diversity, authorsâ backgrounds and research methods. The keyword analysis suggests that ISF research has evolved from establishing concepts and domain of information systems (IS), technology and management to contemporary issues such as outsourcing, web services and security. The analysis presented in this paper has identified intellectually significant studies that have contributed to the development and accumulation of intellectual wealth of ISF. The analysis has also identified authors published in other journals whose work largely shaped and guided the researchers published in ISF. This research has implications for researchers, journal editors, and research institutions
- âŠ