ELEKTRONIKA, ENERGETYKA, ELEKTROTECHNIKA ›
ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA ›
2009-11 |
| |
|
|
Prenumerata
|
A buffer thresholds policy in linked in series servers with blocking
|
|
WALENTY ONISZCZUK 
|
The aim of this paper is to build up an analytical model of computer
networks with blocking, feedback priority service and
threshold policies; seeking to obtain high network utilization,
acceptable delay time, and some degree of fairness among
users. In the past couple of years, there has been a strong
demand for computer networks that can provide adequate
quality of service (QoS) among users. Such demand initiated
a need for a solution where the servers play an active role in
congestion control. A series of threshold policies and congestion
control procedures were proposed to control queue
lengths and to promote fairness among task generating
sources [1,6]. Queuing network models (QNMs) with finite capacity
queues and blocking provide powerful and practical
tools for performa[...]
|
|
|
|
A system automating repairs of IT systems
|
|
|
MAREK KAMIŃSKI
|
Very fast and progressive informatization of almost all domains
of our lives became an undisputed fact. Because huge
number of IT systems of various kinds needs supervision and
maintenance 24 hours a day and 365 days a year, many IT
companies provide nowadays to their customers a new service
offer of remote monitoring, technical support and assistance
in taking care of their systems.
Monitoring is relatively easy in realization because lots of
monitoring systems have been already developed [1] and they
usually accomplish their task in a satisfactory way. We distinguish
traditional monitoring systems [2-7] (usually having centralized
monitoring logic), and ones dedicated to monitoring
grid or cluster structures [8-11] (usually having monitoring
logic distributed), but regardles[...]
|
|
|
|
An experiment of implementation of DLP system working as a Linux kernel loadable module
|
|
|
ADAM RAKOWSKI IMED EL FRAY
|
Computerization in business is a fact. A perspective of shortening
the time of document flow between company units, improving
internal communication and enhancement of management
processes is expectation of many managers. Due to increased
role of computers in business, the need of better care of data security
- from physical security till access control is a fact.
Each computerized corporation stores the critical confident
data about its contracts, staff, technology, security procedures
etc... An enterprise shares important data to many people, so
the risk of information leakage caused by disloyality or human
error is significantly increased. Published in 2006 "Deloitte’s
2006 Global Security Survey" [1] tells that the second most frequent
reason of internal IT security v[...]
|
|
|
|
Average individual classification probability function
|
|
|
MAREK LANDOWSKI ANDRZEJ PIEGAT
|
In everyday life people use different words to make various
mental calculations. Therefore the proper description of
a word is a crucial problem. There are two types of models of
linguistic concept: possibilistic model and probabilistic model.
In the possibilistic theory models of linguistic concept are described
by the membership function [1], whereas in probability
theory models of linguistic concept are described by
classification probability function [2,3]. Possibilistic models described
by the membership function are mainly used in fuzzy
control and in modeling input-output relation of an object like
y = f(x1, x2, …, xn). Probabilistic models describing linguistic
concepts by classification probability function seem to perform
better in automatic thinking and decisio[...]
|
|
|
|
Evolutionary sets of cooperating ship trajectories: open waters and restricted waters
|
|
|
RAFAŁ SZŁAPCZYŃSKI
|
The paper contains a description of an already developed, revised
version of the method, which has been first presented by
the author in its early version in [1]. The method combines
some of the assumptions of game theory approach to this
problem [2] with evolutionary programming approach [3] and
aims to find an optimal set of cooperating trajectories of all
ships involved in an encounter situation, by means of evolutionary
algorithms. Depending, whether we are focusing on
restricted water regions or open waters, specific methods of
generating the initial population, various ship domains and different
sets of specialised operators have been used throughout
the research presented here.
Optimisation problem
It is assumed that we are given the following data: stationary
constrai[...]
|
|
|
|
Generation of harmonic sequences in accordance to tonal harmony rules with artificial neural networks
|
|
|
WOJCIECH ZABIEROWSKI ANDRZEJ NAPIERALSKI
|
There has been a continuous research throughout the world.
in the field of computer generated music. Many implementations
has appeared as well as a lot of disputes on this topic,
and it is now perceived as a branch of science.
The computer participation in the process of music creation
is not only restricted to being an aid for the composer. In
fact, a machine is able to replace human in the creation
process. There are some realizations that are purely machinegenerated
and which were able to reach the top of pop music
lists, successfully competing with human-made works.
The elements of the branch of science mentioned above
include musicological analysis of musical opus and automatic
harmonization of the melody line. The research presented
below can be applied in particular in [...]
|
|
|
|
Global multicriteria optimization in weather routing
|
|
|
JOANNA SZŁAPCZYŃSKA
|
A task of finding a global optimum in a complex, non-linear optimization
problemwith constraints belongs to NP-hard problem
class. Hence, selecting a global optimization method reliable
and suitable for given problem might be a challenge [1]. The
problem becomes even more complicated when it is defined as
a multicriteria (aka multiobjective) optimization problem (MOP).
Possible approaches include goal function linearization, interactive
optimization techniques and multicriteria searching for
Pareto-optimal solutions. The latter scheme is the most popular
and often performed by metaheuristic methods.
Ship route optimization in weather routing is an example of
a real lifeMOP class problem. The term“weather routing" refers
to a process of finding the most convenient route fo[...]
|
|
|
|
Influence of the number of bins on the recognition results using Point Distance Histogram
|
|
|
DARIUSZ FREJLICHOWSKI
|
The shape is one of the features of an object that can be used
for its recognition. In the template matching approach a shape
has to be properly represented. It means that it has to be described
in a way making the process of recognition easier.
Usually, the shape description algorithm has to be invariant to
some of its deformations, e.g. scaling or rotation. The most desirable
approaches are robust to all shape deformations. However,
there are not many of that kind, because it is really difficult
to construct an algorithm solving so many various problems.
Moreover, in many cases not all shape distortions arise. Sometimes
the invariance to a few selected problems is sufficient.
Nowadays, the number of shape descriptors applied in the
pattern recognition area is innumerable (an [...]
|
|
|
|
Medical pattern intelligent recognition based on linguistic modelling of 3D coronary vessels visualisations
|
|
|
MIROSŁAW TRZUPEK MAREK R. OGIELA RYSZARD TADEUSIEWICZ
|
Characteristic for the coronary vessels in different patients with
various pathologic forms observed on flat, i.e. 2D, images is a
certain level of repetitiveness and regularity. The same images
registered by a machine rendering 3D images (helical CT
scanner) feature a much greater number of visible details,
which, however, results also in the increase of the number of
both individual differences and those between various examinations
of the same patient. Having considering these difficulties,
a decision was made to apply the methods of automatic
image understanding for the interpretation of the images considered,
which consequently leads to their semantic descriptions.
Thanks to such posing of the problem, the diagnosis put
forth (being naturally but a suggestion for the physi[...]
|
|
|
|
Ochrona własności przemysłowej w Przemysłowym Instytucie Telekomunikacji S.A. na przestrzeni 75 lat Jego historii
|
|
|
JERZY KOBIERZYCKI WŁADYSŁAW KĘSKA
|
Artykuł ma charakter okolicznościowy z okazji 75 lat istnienia
Przemysłowego Instytutu Telekomunikacji S.A. i prezentuje
osiągnięcia Instytutu w obszarze ochrony własności przemysłowej.
Na wstępie zawiera rys historyczny, krótko charakteryzuje
politykę patentową PIT S.A. oraz służbę ochrony
własności przemysłowej. Zaprezentowano również osiągnięcia
patentowe PIT S.A., opisano konkurs "Mistrz Wynalazczości
i Racjonalizacji" - organizowany w Instytucie od 1979 roku. Pokazano
sylwetki 10 najbardziej wyróżniających się twórców.
Rys historyczny
Podstawą prawną podjęcia działalności w zakresie ochrony
własności przemysłowej w powołanym w 1934 roku Państwowym
Instytucie Telekomunikacyjnym było Rozporządzenie
Prezydenta Rzeczypospolitej z dnia 22 marca 1928 roku
o ochronie wynalazków[...]
|
|
|
|
Ontology-based approach to scada systems vulnerabilities representation for CIP
|
|
|
MICHAŁ CHORAŚ ANNA STACHOWICZ RAFAŁ KOZIK ADAM FLIZIKOWSKI RAFAŁ RENK
|
Critical Infrastructures are the organizations delivering goods
and services in an economy that are fundamental to the functioning
of society and the economy [1]. As for types of critical
infrastructures, there are some domains within an economy
that are considered crucial and most important. The loss of or
disaster within a CI will affect a part or all society. Some of
critical sectors described in [2] are agriculture and food, water,
public health and defence.
The INSPIRE Project focuses on telecommunication, energy
and transportation sectors. CI are now identified and protected
by national and international law and regulations
(nationally in e.g. Poland by Ministry of Infrastructure in Crisis
Management regulations [3]; internationally e.g. by NATO and
by EU) [4-6]. Most of[...]
|
|
|
|
Open virtual steganographic laboratory
|
|
|
PAWEŁ FORCZMAŃSKI MICHAŁ WĘGRZYN
|
Among many different applications where data hiding techniques
can be used, one that has received huge attention in recent
years is steganography. In that scenario, not just the
embedded message is hidden, but the communication process
itself is tried to be concealed. Steganography is both art. and
science of undetectable communication [1]. Opposed to cryptography
which encrypts a message, steganography achieves
private communication by hiding message in cover object so
not only content is known but also very existence of message.
Throughout the history many different media types have been
used to hide information. Nowadays steganographic applications
[9,16] are using computer file system, transmission protocols,
audio files, video files, text files or images, which are the
mo[...]
|
|
|
|
Radary pasywne - nowa technika radiolokacji
|
|
|
ZBIGNIEW CZEKAŁA
|
Termin "radar pasywny" bywa używany niezbyt precyzyjnie
w odniesieniu do sensorów, które wykrywają i lokalizują
obiekty powietrzne na podstawie promieniowania elektromagnetycznego
emitowanego przez zainstalowane na nich
urządzenia, takie jak radary pokładowe, radiostacje, transpondery
systemu rozpoznawania "swój-obcy". Dobrze znanymi
sensorami tego typu są urządzenia Tamara i Vera
produkcji czeskiej, a kilka lat temu szczególne zasłynął ukraiński
system Kolczuga. Niefortunność terminologii polega tu
na tym, że tego typu urządzenia w istocie nie są radarami,
gdyż nie wykorzystują energii odbitej od wykrywanych obiektów,
tylko energię bezpośrednio przez nie emitowaną. Chociaż
z pierwotnego znaczenia angielskiego terminu "radar"
jako skrótu od radio detection and ranging nie wyni[...]
|
|
|
|
Signed electronic document and its probative value in certificate and certificateless public key cryptosystem infrastructures
|
|
|
JERZY PEJAŚ
|
The Art. 5, paragraph 1 of the Act on Electronic Signature from
September 18th, 2001 (see [1]) states that the secure electronic
signature based on a qualified certificate (shortly, the
qualified electronic signature) evokes legal effects defined by
Act if it was created in the validity period of this certificate. This
regulation doesn’t apply to the certificate after period of its validity
or from the day of its revocation and in the period of its
suspension unless there is possible to prove that the signature
was created before end of the validity period of the certificate
or its revocation or suspension (i.e. to avoid a signature to become
unduly questionable or even rejected in the future, the
point in time when it was issued may require to be provable).
The requireme[...]
|
|
|
|
SMS-B project of educational platformfor e-business
|
|
|
PIOTR JAŁOWIECKI TOMASZ WOŹNIAKOWSKI ARKADIUSZ ORŁOWSKI
|
Nowadays companies and enterprises collects and stores
huge amounts of data. However according to different evaluations
until recently only not much over 7% of these informations
were using in business strategic decisions making
processes [1,6]. Change of this situation became possible with
popularizing the Business Intelligence (BI) technologies.
Originally the BI applications were understood only as
a specialized systems of the information management. Currently,
BI systems still are being used in their primal role to deliver
information for management support processes but more
often these systems constitutes wide connecting of applications
and technologies used for collecting, aggregation, selection,
analysis and suitable presentation of the business information
derived fro[...]
|
|
|
|
Synthesis and management of system with parallel multiprocessors and fault tolerance
|
|
|
MIECZYSŁAW DRABOWSKI
|
The management of computer systems [1,2] is an issue the
basic objective of which is to find an optimum solution, satisfy
the requirements and limitations enforced by the given specification
of operations (tasks) and resources. The following criteria
of optimality are usually considered: the costs of planning in
execution of operations, its operating speed and reliability. The
problems of operations and resources scheduling are one of
the most significant issues occurring at the procedure planning
of operating system responsible for controlling the distribution
of tasks and resources in computer systems. The problem of
control in resources requires the list of available hardware resources
- the set describing resources - which can be used to
realization of operations. The start[...]
|
|
|
|
System dalekosiężnej identyfikacji i śledzenia statków
|
|
|
JERZY CZAJKOWSKI KAROL ŁYSZYK
|
Opisując dziesięciolecie istnienia Światowego Morskiego Systemu
Łączności Alarmowej i Bezpieczeństwa - GMDSS (Global
Maritime Distress and Safety System) w artykule
opublikowanym w numerze 5/2009 Elektroniki autorzy oprócz
przedstawienia ogólnej charakterystyki systemu, podsystemów
składowych i realizowanych funkcji scharakteryzowali tematykę
obrad Podkomitetu IMO (International Maritime
Organization) ds. radiokomunikacji ratownictwa - COMSAR
(Communication Search and Rescue). Podkomitet ten na
przestrzeni ostatnich dziesięciu lat podejmował sprawy które
związane były z ciągłym rozwojem systemu GMDSS - zarówno
dotyczących nowych technologii, jak i systemów zwiększających
bezpieczeństwo żeglugi. Między innymi w artykule
wspomniano o radiowych systemach do ochrony statków
i por[...]
|
|
|
|
Szkło dla fotoniki. Część 14.Parametry szklanego włókna optycznego
|
|
|
RYSZARD ROMANIUK
|
Szklane włókno optyczne jest popularnie uważane za dość prosty
optyczny lub optoelektroniczny obiekt pasywny przeznaczony
do transmisji fali EM. W powszechnym rozumieniu
parametry włókna optycznego decydujące o jego wszystkich
właściwościach to: tłumienność, średnica i refrakcja. W sensie
ekonomicznym znaczną dominantę stanowią włókniste szklane
światłowody telekomunikacyjne wytwarzane zaledwie w kilku
podstawowych rodzajach ściśle opisanych przez stosowne
normy przemysłowe. Wśród światłowodów telekomunikacyjnych
dominującą ekonomicznie grupą są skompensowane dyspersyjnie
światłowody jednomodowe szerokopasmowe
przeznaczone do transmisji fali optycznej z podziałem falowym
DWDM. Drugim głównym rodzajem włókien telekomunikacyjnych
są znacznie tańsze światłowody wielomodowe przezn[...]
|
|
|
|
|
|
The efficient data authentication in Web GIS
|
|
|
WITOLD MAĆKÓW
|
The web mapping and Web GIS are relatively new phenomena.
They may be treated as a branch of development of classical
GIS (Geographic Information System). On the one hand,
their appearance was forced by increasing public demand for
accessible and fresh spatial data, and on the other hand rapid
development of internet technologies made it possible. Although
terms web mapping and web GIS are often used alternatively,
their meanings is slightly different. Web mapping
is usually understood as a process of designing, generating
and distributing spatial data in form of a map across internet.
Web GIS basses on the similar foundations, but the special
emphasis is put on possibility on processing and analyzing of
spatial data by end user [1]. Sometimes web mapping may be
treated as a f[...]
|
|
|
|
The role of fuzzy modeling in creation of knowledge base’s for intelligent decision’s support systems hydrometeorological phenomenon threat
|
|
|
TATIANA TRETYAKOVA
|
The hydrometeorological information is one of many types of
information used in the decision of a different sort of problems
issues. It is well known, that this type of information should be
used to avoid or reduction of the negative consequences connected
to influence of hydrometeorological factors on functioning
of economic objects (industrial, service, social and
cultural). The probable variant of a chain of the consequences
connected to influence of hydrometeorological factors on economic
object, could be presented as follows: influence of the
dangerous hydrometeorological phenomenon → damage of
subsystems of the economic object → abnormality of functioning
of the object → negative influence on the ecological
environment and people’s health → t[...]
|
|
|
|
The security level of particular blind steganographic systems
|
|
|
JERZY KOROSTIL ŁUKASZ NOZDRZYKOWSKI
|
Steganographic hiddenmessages in digital graphic image should
not lead to visible distortions in the resulting image [1,2]. There
are many methods of reducing the occurrence of distortion. One
of thesemethods is presented in the article [3], where by using of
specified threshold values it rejects blocks which statistical metrics
reveal the existence of a single structure. Hidden messages
in such block would result in the occurrence of visible distortions.
This article proposes the utilization of human visual perception
and its limits that the message is hidden below the
threshold of human vision. It enables the examination of proposed
steganographic methods to ensure a proper level of
concealment of hidden message.
Determining the size of distortions
caused by steganographic h[...]
|
|
|
|
The use of speech recognition and user verification in closed-circuit television systems
|
|
|
MARIUSZ KUBANEK
|
Speech recognition systems, and the verification of persons
on the basis of independent speech are widely used. Speech
is the most natural way for humans to communicate with each
other. Over the past decade, much work has been done in
man-machine communications in order to incorporate speech
as a new modality in multimedia applications. The greatest interest
is in two areas which have received considerable interest:
speech recognition, in which the aim is for the machine to
extract and understand the linguistic message in the speech,
and speaker recognition, where the goal is to identify, recognize
or verify the speaker responsible for producing the
speech. Speech recognition systems are used in mobile
phones for dial voice, in operating systems to voice control of
different a[...]
|
|
|
|
Wielopoziomowy trening symulacyjny w szkoleniu operatorów urządzeń. Zastosowanie do szkolenia operatorów robotów mobilnych
|
|
|
ANDRZEJ KACZMARCZYK MAREK KACPRZAK ANDRZEJ MASŁOWSKI
|
Do szkolenia operatorów urządzeń kosztownych i/lub stwarzających
istotne zagrożenie dla otoczenia w przypadku błędu
operatora używa się trenażerów wykorzystujących symulację
komputerową (symulatory do szkolenia pilotów, kierowców
pojazdów drogowych i szynowych, obsługi broni i innych
urządzeń wojskowych). Zapotrzebowanie na trenażery będzie
rosło z wielu powodów. Po pierwsze pojawiają się nowe
urządzenia i nowe profesje operatorskie. Jednym z takich nowych
obszarów jest szkolenie operatorów robotów zdalnie
sterowanych, znajdujących coraz szersze zastosowanie
w wielu dziedzinach - w wojsku i policji, inspekcji i ratownictwie,
pielęgnacji i medycynie (ze zdalną chirurgią włącznie).
Po drugie - w starych i w nowych profesjach będzie rosła
liczba operatorów do przeszkolenia, gdyż [...]
|
|
|
|
Wpływ konstrukcji cyfrowych układów scalonych na generację zaburzeń elektromagnetycznych
|
|
|
JULIUSZ SZCZĘSNY
|
W artykule przedstawiono wyniki pomiarów emisji zmiennych
pól EM w funkcji częstotliwości taktowania, generowanych
przez układy scalone w formie matryc FPGA, zawierające
często spotykane bloki funkcjonalne, rozmieszczone
w różnych miejscach struktury półprzewodnikowej [1,2]. Opracowano
w tym celu dwa projekty układów scalonych mających
za zadanie mnożenie liczb w nieskończonej pętli programowej.
Pierwszy z projektów wykorzystywał algorytm mnożenia
kombinacyjnego a drugi sekwencyjnego. Projekty te były dodatkowo
modyfikowane w celu zmiany liczby i topologii aktywnych
bramek logicznych. Każdy projekt układu scalonego
był implementowany do matrycy cyfrowej Xilinx typu XCV 800.
Zmiany konfiguracji oraz liczby bloków funkcjonalnych wykorzystywanych
przez każdy z projektów pozwoliły[...]
|
|
|
|
Wspomnienie Edward Leja (1937-2009)
|
|
Niniejsze wspomnienie jest moją osobistą refleksją,
wdzięcznością i podziękowaniem - za możliwość
wspólnej pracy, korzystania z Twojego ogromnego
doświadczenia zawodowego oraz prostej ludzkiej
życzliwości i przyjaźni - jaką miałem okazje doświadczyć
- dziękuję Ci za to Edwardzie.
Edward Leja urodzony
w 1937 roku w Rakszawie,
powiat Łańcut, mając
10 lat stracił ojca i wraz
z bratem bardzo wcześnie
musieli myśleć o sobie,
musieli stać się samodzielni
i dorośli.
Edward bardzo dobrze
się uczył, wykazując
szczególne zamiłowanie
do malowania oraz uzdolnienia
w kierunku nauk
matematyczno-fizycznych. Po zdanej w 1954 roku maturze
próbował dostać się na Akademię Sztuk Pięknych
w Krakowie, ale Jego dokumenty maturalne z Liceum
Ogólnokształcącego w Żołyni nie dotarły na czas do
[...]
|
|
|
|
XVII Walne Zebranie Członków Polskiego Towarzystwa Próżniowego
|
|
Podczas obrad XI Seminarium Powierzchnia i Struktury
Cienkowarstwowe odbyło się 20.05.2009 r. w Szklarskiej
Porębie zwołane przez Zarząd Główny Polskiego
Towarzystwa Próżniowego na podstawie uchwały
Zarządu PTP nr 3/2009:
Uchwała Zarządu PTP nr 3/2009
Na podstawie §25 p. 4 statutu PTP Zarząd zwołuje
Walne Zebranie Sprawozdawczo - Programowe
Członków Towarzystwa w Szklarskiej Porębie, w Ośrodku
Konferencyjno-Szkoleniowym "Radość" Politechniki
Wrocławskiej ul. Muzealna 5, 20 maja 2009 r. -
w trakcie XI Seminarium "Powierzchnia i Struktury Cienkowarstwowe"
na godz. 1945 w I terminie,
na godz. 2000 w II terminie
z następującym porządkiem obrad:
1. otwarcie zebrania,
2. wybory Sekretarza Walnego Zebrania,
3. przyjęcie porządku obrad,
4. wybór Komisji Wnioskowej,
5. sprawozdan[...]
|
|
|
|
|
|
Twój Profil
Twój koszyk
