Journal archive
IT management |
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Resource management |
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A company’s ability to change increasingly depends on the ability to change its IT, something
referred to as «IT agility» here. High IT agility can contribute to increased business agility and
thus create a competitive advantage. In this paper we look at which factors influence IT agility
and how the IT agility can be increased. The main body of the paper, however, is devoted to the
research question how IT agility can be measured and actively managed. Here, the focus is on
the IT application systems landscape, a resource of significant importance for the IT agility and
competitiveness of a company.
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IT and education |
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Training IT specialists |
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The study explores characteristics of the German academic discipline «Wirtschaftsinformatik
». It is based on a literature review of fourteen publications on the history of the discipline and
on a comparison of research approaches of «Wirtschaftsinformatik» and the North-American
sister discipline «Information systems». The study identifies four characteristics of the academic
discipline «Wirtschaftsinformatik» and derives six challenges and opportunities for the business
informatics community worldwide.
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Software engineering |
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Defense software |
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authentication
server. The method of two-factor authentication of users of computer systems on the remote
server using personal biometric data is proposed. The method based on error-correcting coding and
other conversion of biometric data. The developed method is based on «fuzzy extractors» and allows
to store only fragments of biometric standard on the server and does not allow to restore the standard
if this fragments were stolen. As the biometric features of a person is proposed to use the keystroke
dynamics: duration of retention and the time intervals between keystrokes as a person type the passphrase
on the keypad. An original way to use information about the stability of biometric features is
proposed. The information about biometric features stability is used to choose the best ones for preparing
a cryptographic key and decrease errors of key generation. Also it is a part of a secret information
that storages on the server side and used in key recovery procedure. As a part of the future research
for «combining» and «subtraction» bit sequences of PRN code and biometric data for cryptographic
key generation it is planned to use fuzzy implication operation, adapting one of the fuzzy inference
algorithms (Tsukamoto, Sugeno, Mamdani, Larsen et al.)
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Software development technologies |
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As the title implies the paper considers 64‑bit enhancement of x86 (x86-64) and features of the 64‑bit
operating systems. There are some new characteristics of the architecture x86–64 such as 64‑bit integer
capability, additional registers, larger physical address space, RIP-relative addressing, additional
XMM registers, etc. Some of these issues are reflected in our article. We focus on the main features of
this specification with the point of view of programming. Much attention in our paper is given to such
concepts as «red zone» and «shadow space», which are associated with calling conventions. The paper
speaks in detail on the differences in the approaches (regarding calling conventions) adopted in
families of 64‑bit operating systems Windows and UNIX. We compare the low-level program architecture
for different operating systems supporting the x86–64 specification. The paper gives examples
of analysis of the executable code, which are compiled for operating systems with different calling
conventions. For the purity of the experiment the programs for different operating systems are translated
by compilers of C from the GNU Compiler Collection (GCC). For the study of executable code
for 64‑bit operating systems Windows and UNIX, we used the disassembler IDA PRO version 5.5.
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Algorithmic efficiency |
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This article describes the work performed by the author on the modernization of software of the
standards complex of time and frequency. New software is developed; there were made improvements
to the algorithm of formation of the analytical time scales. This work was performed with the
aim of developing technical means for fundamental support of the GLONASS system for modernization
of systems for national time scale keeping on the basis of hydrogen masers to achieve the tactical
and technical characteristics of the GLONASS system on the harmonization of the national time
scale with the International scale of coordinated universal time. Developing standards complex of time
and frequency must be part of modernized complexes of national time scale and is intended to ensure
that time scales of modernized complexes for national time scale keeping. In the process of upgrading
software of the standards complex, there was done the work on improving the methods of forming
group hydrogen keeper of the frequency and calculation of the national time scale. There were applied
weight coefficients to reduce the error of the mean relative changes in the frequency of the hydrogen
standard, on a monthly measurement interval. The sliding interval estimation of the frequency
model parameters of hydrogen masers was used for reducing the frequency instability of the analytical
frequency of group hydrogen keeper. During use of the program in the State metrological centre
«State service of time, frequency and the Earth rotation parameters determination», it was concluded
that the application of weight coefficients when determining the parameters of the regression model
of frequency changing of the reference standard allows slightly reduce the average relative errors on
annual time interval of the observations on average by 1%. It was found that the use of a sliding interval
estimation of the frequency model parameters of hydrogen masers at each day of measurements
can considerably reduce the instability of the analytical frequency of group hydrogen keeper. Using
the new method the relative decrease of the frequency instability was approximately 10% for a threemonth
time interval of observations.
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Simulation |
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Theory and practice |
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The author describes process-oriented simulation of queues with Excel. This method does not
require writing code in a programming language and is the most easy to understand, because the
whole history of the entities is reflected in one line. Modeling of the following queuing systems:
single-channel system with a queue, a two-channel system with unlimited waiting, single-channel
system with time-limited expectation, a system with group service entities, and system with batch
arrival of entities. The paper considers the mechanism of phase modeling and re-modeling in the
specified number of random realizations. For the simulation of random realizations were used cyclic
table cell, which act as storage. When considering a staged simulation, the receipt of each application
is modeling with the click of a button. The article describes the construction of graphs
to illustrate the progress of the simulation: device service requests, queue length, system state.
For their construction were used scatter plot and bar charts. The article may be useful for readers, who
want to create basic models of queues systems using spreadsheets. The presented models can be using
to teach the basics of simulation, as well as demonstration material in lectures.
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The article discusses the importance of the development of methods and simulation tools, primarily
by converting visual (graphic-analytical) organizational and business models and production processes.
It describes the basic concepts and formalisms for system-object approach «Unit-Function-
Object» (UFO-approach) and the system-object methods of knowledge representation (SOMKR) using
the apparatus of algebraic of the patterns theory Grenander, calculus processes Milner and calculus
objects Abadi-Kardelj. Substantiates the prospects of the use of these funds for the creation of new
methods of simulation. We present two methods of simulation using the system-object approach «Unit-
Function-Object». Firstly, by formalizing the system-object graphical-analytical models of knowledge
of business processes by means of algebraic calculation objects and, secondly, by converting the visual
system-object models to describe them in the language of the simulation of production processes
«CHI» (c). The results suggest the possibility and feasibility of simulation tools using in the based
UFO-approach, which is implemented in the new version of software tools UFO-toolkit, automates
the procedure described in the article modeling.
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Laboratory |
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Researching of processes and systems |
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The projects of creation and organization the high-technology industrial products production include
interrelated tasks (activities) of envisioning, planning, design and developing. Such projects have several
specifics, such as different structural relationships between activities, high level of information
uncertainty and large amount of controlled parameters. The quantity of these parameters depends on
external factors and internal connections of the project. The described peculiarities determine the necessity
of modifying of widely practiced project management formal methods and models. The article
describes requirements to project models, on which the proposed method of model creation is based.
The method includes the following stages: the decomposition of the project to subprojects; the creation
of network models of the subprojects; the creation of the model that consists of activities belonging
to different subprojects and having common input/output connections; the identification of the project
goals with the help of indicators. The indicators may be of different types: quantitative (point ant
interval estimations) and qualitative. The indicators for each goal-oriented project state are integrated
with the use of proposed algorithm and form the project trajectory. The considered model makes possible
to estimate the project trajectory in various time points. As a result the project management becomes
stable under uncertainty.
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Point of view |
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Methodology of science |
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This article is devoted to a problem of creation of the program systems (PS) organizing the information
search (IS), and providing high rates of efficiency for the mass user (not the expert in the field of
informational technologies). Researches weren’t limited by the review of achievements in practice of
creation PS_IS, and also in the corresponding scientific and engineering disciplines. The subject of researches
is the process of achievement of mutual understanding in communication between two subjects.
Such researches completely correspond to the character of researches in the scientific direction of artificial
intellect. It points out the essence which allocates from the process of communication between subjects,
and it is explained the concept corresponding to it and it is offered to call «initial identification».
Consideration of process of initial identification allowed to reveal the main contradiction in a problem
of creation PS_IS. In the process of communication (and respectively in IS) the subject operates with all
known set of concepts and uses thus as gained recognition (simple or compound) names of concepts, and
the names formed directly in the course of communication. However in a natural language only 83.000
concepts are called by simple unique names (in a word). Compound names called incomparably more
concepts, they make only insignificant part of concepts with which the subject operates in communication.
Thus, the dominating part of algorithms of II is connected with application of quickly named concepts.
It is shown that process of an operational name is feasible only with use of the model of knowledge
approached to gnoseological model. And it is also specified that after some time in computer systems
emergence of such models of knowledge is possible.
For the new technology of IS the organization of access of each concrete tag of a concrete concept
to its names in base of names is offered. That makes a basis of the organization of base of simple
and compound names. Also other characteristics of the organization of the dictionary at triune essence
are provided.
Such concept as»construction of sentence» is offered for a broad use in scientific practice interpretation
of which corresponds to interpretation of the concept «sense of the sentence» with explanations,
which allow to draw sense from sequence of alphanumeric symbols.
A great place in this work takes consideration of algorithms of formation and recognition of sentences
(that is II). Many situations of II suspension are revealed and described. It is noted that completeness
of such situations, and also algorithms of permission of the concrete situations and scenarios
of interactive interaction providing finishing II up to the end make the essence of works on formation
of the specification on design of PS realizing new technology of IS.
In conclusion it is pointed out that the declared subject due to its scale can’t be opened in one article in
details (scrupulously) to conform to requirements to the specification on creation of II. It is important that
the complete picture of new technology of IS is given in article and feasibility of such technology is shown.
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Methodology of science |
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The methodical bases of the information sciences are considered, included terminological base and
the problem of the information concept definition. The classification questions of the informatics and
metaphorical understanding information analysis in the evolution biophysics («bioinformatics») are
considered also. Discipline, which have claim on special information science role, in really to appear
«sciences» about digital information technologies in different directions of sciences, technics and economy.
They gain all-sciences knowledge role and integrated common-education discipline role through
assimilation of part of the origin science to digital information technologies. Together with logic-semiotic
and mathematical methods in social-economics information directions used own info-logic
model method. The communication mathematical theory of C. Shannon to find own application for
the most part in technical sphere. In real time theoretical base do not exist, which common to all information
sciences (used functional definitions or attributive definitions), excepting well known theory
three universes of C. Popper and environment conception by K. K. Kolin, which develop theory
three universes of C. Popper. The common theoretical bases of any information sciences is consider.
That analysis has important to classification of informatics, which based on the origin importance and
based on the metaphorical importance.
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