75 research outputs found
Large closed queueing networks in semi-Markov environment and its application
The paper studies closed queueing networks containing a server station and
client stations. The server station is an infinite server queueing system,
and client stations are single-server queueing systems with autonomous service,
i.e. every client station serves customers (units) only at random instants
generated by a strictly stationary and ergodic sequence of random variables.
The total number of units in the network is . The expected times between
departures in client stations are . After a service completion
in the server station, a unit is transmitted to the th client station with
probability , and being processed in the th client
station, the unit returns to the server station. The network is assumed to be
in a semi-Markov environment. A semi-Markov environment is defined by a finite
or countable infinite Markov chain and by sequences of independent and
identically distributed random variables. Then the routing probabilities
and transmission rates (which are expressed via
parameters of the network) depend on a Markov state of the environment. The
paper studies the queue-length processes in client stations of this network and
is aimed to the analysis of performance measures associated with this network.
The questions risen in this paper have immediate relation to quality control of
complex telecommunication networks, and the obtained results are expected to
lead to the solutions to many practical problems of this area of research.Comment: 35 pages, 1 figure, 12pt, accepted: Acta Appl. Mat
The effective bandwidth problem revisited
The paper studies a single-server queueing system with autonomous service and
priority classes. Arrival and departure processes are governed by marked
point processes. There are buffers corresponding to priority classes,
and upon arrival a unit of the th priority class occupies a place in the
th buffer. Let , denote the quota for the total
th buffer content. The values are assumed to be large, and
queueing systems both with finite and infinite buffers are studied. In the case
of a system with finite buffers, the values characterize buffer
capacities.
The paper discusses a circle of problems related to optimization of
performance measures associated with overflowing the quota of buffer contents
in particular buffers models. Our approach to this problem is new, and the
presentation of our results is simple and clear for real applications.Comment: 29 pages, 11pt, Final version, that will be published as is in
Stochastic Model
Features of lecture preparation from the subject âChild's surgery, orthopaedy and traumatologyâ in the Ukrainian high medical institutions
In the article review discusses topical issues towards numerous forms of presentation as well as lecture in the course from âChildâs surgery, orthopaedy and traumatologyâ: basic principles of lecture material preparing, basic points of the lecture standardization, modern technological capabilities providing while preparing lectures, motivational capabilities of lectures for students. High requirements for professional training on the subject, the information technologies accelerated development, ability for scientific and pedagogical activity - such requirements should be carried out for University lecturer. Today should be appointed the skills focused on a foreign language and a communication with native speakers. Lecture from âChildâs surgery, orthopaedy and traumatologyâ should be focused on an audience's attention for a long period of time. Therefore, careful preparation on the lecture, accumulation of new scientific data, choice of modern technologies for presentation, adaptation of lectures in order to suit the audience, connection between theoretical topics with practical assignment should be carried out on the practical clinical activities, individual approach of the lecturer as well as themes presentation are key components for teachersâ activity during lecture preparation and presentation of material
Prevention of autonomic disadaptation in service members
The autonomic nervous system (ANS) is the main regulator of maintaining homeostasis and organism adaptation to
changes in the environment. Most often, autonomic dysfunction occurs under the conditions of chronic psychoemotional stress.
To prevent emotion dysregulation and stress-related disorders in service members, the state of the autonomic nervous system was
assessed by examining 145 military servicemen, considering the initial autonomic tone, autonomic reactivity and autonomic
support of the individual. In most subjects there was tension and dysfunction of the ANS, which allowed us to recommend a more
thorough study of its three main components in order to identify autonomic disorders and the allocation of these persons to the risk
group for psychosomatic pathology.
ĐДгДŃĐ°ŃĐžĐČĐœĐ° ĐœĐ”ŃĐČĐŸĐČĐ° ŃĐžŃŃĐ”ĐŒĐ° (ĐĐĐĄ) Ń ĐłĐŸĐ»ĐŸĐČĐœĐžĐŒ
ŃДгŃĐ»ŃŃĐŸŃĐŸĐŒ ĐżŃĐŽŃŃĐžĐŒĐșĐž ĐłĐŸĐŒĐ”ĐŸŃŃĐ°Đ·Ń ŃĐ° ĐżŃĐžŃŃĐŸŃŃĐČĐ°ĐœĐœŃ
ĐŸŃĐłĐ°ĐœŃĐ·ĐŒŃ ĐŽĐŸ Đ·ĐŒŃĐœ Đ·ĐŸĐČĐœŃŃĐœŃĐŸĐłĐŸ ŃĐ”ŃĐ”ĐŽĐŸĐČĐžŃĐ°. ĐĐ°ĐčбŃĐ»ŃŃ
ŃĐ°ŃŃĐŸ ĐČДгДŃĐ°ŃĐžĐČĐœĐ° ĐŽĐžŃŃŃĐœĐșŃŃŃ ĐČĐžĐœĐžĐșĐ°Ń ĐČ ŃĐŒĐŸĐČĐ°Ń
Ń
ŃĐŸĐœŃŃĐœĐŸĐłĐŸ ĐżŃĐžŃ
ĐŸ-Đ”ĐŒĐŸŃŃĐčĐœĐŸĐłĐŸ ŃŃŃĐ”ŃŃ. ĐĐ»Ń Đ·Đ°ĐżĐŸĐ±ŃĐłĐ°ĐœĐœŃ
ĐČĐžĐœĐžĐșĐœĐ”ĐœĐœŃ ĐŽĐžĐ·ŃДгŃĐ»ŃŃŃŃ ŃĐ° ŃŃŃĐ”Ń-Đ°ŃĐŸŃŃĐčĐŸĐČĐ°ĐœĐžŃ
ŃĐŸĐ·Đ»Đ°ĐŽŃĐČ
Ń ĐČŃĐčŃŃĐșĐŸĐČĐžŃ
бŃĐ»ĐŸ ĐżŃĐŸĐČĐ”ĐŽĐ”ĐœĐŸ ĐŸŃŃĐœĐșŃ ŃŃĐ°ĐœŃ ĐČДгДŃĐ°ŃĐžĐČĐœĐŸŃ
ĐœĐ”ŃĐČĐŸĐČĐŸŃ ŃĐžŃŃĐ”ĐŒĐž ŃĐ»ŃŃ
ĐŸĐŒ ĐŸĐ±ŃŃĐ”Đ¶Đ”ĐœĐœŃ 145 ĐČŃĐčŃŃĐșĐŸĐČĐžŃ
Đ·
ŃŃĐ°Ń
ŃĐČĐ°ĐœĐœŃĐŒ ĐČĐžŃ
ŃĐŽĐœĐŸĐłĐŸ ĐČДгДŃĐ°ŃĐžĐČĐœĐŸĐłĐŸ ŃĐŸĐœŃŃŃ,
ĐČДгДŃĐ°ŃĐžĐČĐœĐŸŃ ŃДаĐșŃĐžĐČĐœĐŸŃŃŃ ŃĐ° ĐČДгДŃĐ°ŃĐžĐČĐœĐŸĐłĐŸ
забДзпДŃĐ”ĐœĐœŃ ĐŽŃŃĐ»ŃĐœĐŸŃŃŃ ĐŸŃĐŸĐ±Đž. ĐŁ бŃĐ»ŃŃĐŸŃŃŃ
ĐŽĐŸŃĐ»ŃЎжŃĐČĐ°ĐœĐžŃ
ĐŸŃŃб ĐČŃĐŽĐ·ĐœĐ°ŃалОŃŃ ĐœĐ°ĐżŃŃĐ¶Đ”ĐœŃŃŃŃ Ń
ĐŽĐžŃŃŃĐœĐșŃŃŃ ĐĐĐĄ, ŃĐŸ ĐŽĐŸĐ·ĐČĐŸĐ»ŃŃ ŃĐ”ĐșĐŸĐŒĐ”ĐœĐŽŃĐČĐ°ŃĐž бŃĐ»ŃŃ
ŃĐ”ŃДлŃĐœĐ” ĐŽĐŸŃĐ»ŃĐŽĐ¶Đ”ĐœĐœŃ ŃŃŃĐŸŃ
ŃŃ ĐŸŃĐœĐŸĐČĐœĐžŃ
ŃĐșĐ»Đ°ĐŽĐŸĐČĐžŃ
Đ·
ĐŒĐ”ŃĐŸŃ ĐČĐžŃĐČĐ»Đ”ĐœĐœŃ ĐČДгДŃĐ°ŃĐžĐČĐœĐžŃ
ĐżĐŸŃŃŃĐ”ĐœŃ Ń ĐČОЎŃĐ»Đ”ĐœĐœŃ
ŃĐžŃ
ĐŸŃŃб ĐČ ĐłŃŃĐżŃ ŃОзОĐșŃ ĐżĐŸ ĐČĐžĐœĐžĐșĐœĐ”ĐœĐœŃ
ĐżŃĐžŃ
ĐŸŃĐŸĐŒĐ°ŃĐžŃĐœĐŸŃ ĐżĐ°ŃĐŸĐ»ĐŸĐłŃŃ.
ĐДгДŃĐ°ŃĐžĐČĐœĐ°Ń ĐœĐ”ŃĐČĐœĐ°Ń ŃĐžŃŃĐ”ĐŒĐ° (ĐĐĐĄ) ŃĐČĐ»ŃĐ”ŃŃŃ
глаĐČĐœŃĐŒ ŃДгŃĐ»ŃŃĐŸŃĐŸĐŒ ĐżĐŸĐŽĐŽĐ”ŃĐ¶Đ°ĐœĐžŃ ĐłĐŸĐŒĐ”ĐŸŃŃĐ°Đ·Đ° Đž
ĐżŃĐžŃĐżĐŸŃĐŸĐ±Đ»Đ”ĐœĐžŃ ĐŸŃĐłĐ°ĐœĐžĐ·ĐŒĐ° Đș ĐžĐ·ĐŒĐ”ĐœĐ”ĐœĐžŃĐŒ ĐČĐœĐ”ŃĐœĐ”Đč ŃŃДЎŃ.
ĐĐ°ĐžĐ±ĐŸĐ»Đ”Đ” ŃĐ°ŃŃĐŸ ĐČДгДŃĐ°ŃĐžĐČĐœĐ°Ń ĐŽĐžŃŃŃĐœĐșŃОО ĐČĐŸĐ·ĐœĐžĐșĐ°Đ”Ń ĐČ
ŃŃĐ»ĐŸĐČĐžŃŃ
Ń
ŃĐŸĐœĐžŃĐ”ŃĐșĐŸĐłĐŸ ĐżŃĐžŃ
ĐŸ-ŃĐŒĐŸŃĐžĐŸĐœĐ°Đ»ŃĐœĐŸĐłĐŸ ŃŃŃĐ”ŃŃĐ°. ĐĐ»Ń
ĐżŃĐ”ĐŽĐŸŃĐČŃĐ°ŃĐ”ĐœĐžŃ ĐČĐŸĐ·ĐœĐžĐșĐœĐŸĐČĐ”ĐœĐžŃ ĐŽĐžĐ·ŃДгŃĐ»ŃŃОО Đž ŃŃŃĐ”ŃŃĐ°ŃŃĐŸŃООŃĐŸĐČĐ°ĐœĐœŃŃ
ŃĐ°ŃŃŃŃĐŸĐčŃŃĐČ Ń ĐČĐŸĐ”ĐœĐœŃŃ
бŃла ĐżŃĐŸĐČĐ”ĐŽĐ”ĐœĐ°
ĐŸŃĐ”ĐœĐșĐ° ŃĐŸŃŃĐŸŃĐœĐžŃ ĐČДгДŃĐ°ŃĐžĐČĐœĐŸĐč ĐœĐ”ŃĐČĐœĐŸĐč ŃĐžŃŃĐ”ĐŒŃ ĐżŃŃĐ”ĐŒ
ĐŸĐ±ŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžŃ 145 ĐČĐŸĐ”ĐœĐœŃŃ
Ń ŃŃĐ”ŃĐŸĐŒ ĐžŃŃ
ĐŸĐŽĐœĐŸĐłĐŸ
ĐČДгДŃĐ°ŃĐžĐČĐœĐŸĐłĐŸ ŃĐŸĐœŃŃĐ°, ĐČДгДŃĐ°ŃĐžĐČĐœĐŸĐč ŃДаĐșŃĐžĐČĐœĐŸŃŃĐž Đž
ĐČДгДŃĐ°ŃĐžĐČĐœĐŸĐłĐŸ ĐŸĐ±Đ”ŃпДŃĐ”ĐœĐžŃ ĐŽĐ”ŃŃДлŃĐœĐŸŃŃĐž ŃĐ”Đ»ĐŸĐČĐ”ĐșĐ°. Đ
Đ±ĐŸĐ»ŃŃĐžĐœŃŃĐČĐ” ĐžŃŃлДЎŃĐ”ĐŒŃŃ
Đ»ĐžŃ ĐŸŃĐŒĐ”ŃалОŃŃ ĐœĐ°ĐżŃŃĐ¶Đ”ĐœĐœĐŸŃŃŃ Đž
ĐŽĐžŃŃŃĐœĐșŃОО ĐĐĐĄ, ŃŃĐŸ ĐżĐŸĐ·ĐČĐŸĐ»ŃĐ”Ń ŃĐ”ĐșĐŸĐŒĐ”ĐœĐŽĐŸĐČĐ°ŃŃ Đ±ĐŸĐ»Đ”Đ”
ŃŃĐ°ŃДлŃĐœĐŸĐ” ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžĐ” ŃŃĐ”Ń
ДД ĐŸŃĐœĐŸĐČĐœŃŃ
ŃĐŸŃŃĐ°ĐČĐ»ŃŃŃĐžŃ
Ń
ŃДлŃŃ ĐČŃŃĐČĐ»Đ”ĐœĐžŃ ĐČДгДŃĐ°ŃĐžĐČĐœŃŃ
ĐœĐ°ŃŃŃĐ”ĐœĐžĐč Đž ĐČŃĐŽĐ”Đ»Đ”ĐœĐžŃ
ŃŃĐžŃ
Đ»ĐžŃ ĐČ ĐłŃŃĐżĐżŃ ŃĐžŃĐșĐ° ĐżĐŸ ĐČĐŸĐ·ĐœĐžĐșĐœĐŸĐČĐ”ĐœĐžŃ
ĐżŃĐžŃ
ĐŸŃĐŸĐŒĐ°ŃĐžŃĐ”ŃĐșĐŸĐč паŃĐŸĐ»ĐŸĐłĐžĐž
Influence of Sanitary â Domestic Conditions in the Rural Settlements of Dnepropetrovsk Region on the Peasantsâ Healh
Purpose of research: implementation results of sociological survey to the practice of hygienic researches at the subjective estimation of the drinking water quality and sanitary conditions of peopleâs life. Materials and methods. At our study was used standardized "Questionnaire survey about quality of piped drinking water, which enters to the building (apartment)", which contained 25 questions. In the sociological survey were participated 150 respondents. Results. Peasants of Dnepropetrovsk region considered that the following indicators of drinking water quality impact on their health: deterioration quality of piped drinking water, smell â 22.6%, color â 14.6 %, rust â 13.3 %, precipitate â 8.0 %, turbidity and suspended solids â 10.6 %, taste and aftertaste â 13.3 %, foam and impurities â 10.6 % (p<0.05). Some of peasants (14.6 %) have unsatisfactory sanitary conditions, living on 5 â 6 persons in 1 rooms flat (p<0.05). Conclusions. Results of sociological survey shown that among rural residents increased the demand for a consumption of pre-treated drinking water, due to the deterioration quality of tap water in the rural area. It was determined, that increased frequency of use the bottled drinking water â daily it was used by 13 rural respondents (17.3%), once a week â 21 respondents (28%), 2-3 times a week â 8 respondents (10.6%)
Scientifical-methodical background system of medical studentsâ education from discipline child's surgery, orthopaedy and traumatology in Ukraine
Improvement preparation of specialists is a national task, standing before specialists of a higher school. In the conditions of the higher medical education reformation and innovative transformations of the society in Ukraine increasing requirements to the quality of doctorsâ preparation. Requirements to a quality of preparation doctors increasing constantly, that carried out to the search of new forms and methodologies of educational process. Standartization of educational process, using different forms of educating, should be focused on the maximal realization of self-preparation activity and initiativeness of students, which are laying on a basis of Bologna process. Future doctor is, foremost, a specialist, which must be able to make a decision oriented on the life and health of his patients. The important task at the creation of any program is development the system of estimation knowledge and skills of students in points. Current, intermediate and final control is documented in the individual plan of educational process of student. In this document, converting the amount of points is carried out estimations by a scale ECT. Fungal development in the area of medical knowledge and proposes of an innovative transformations of society should provide a new system of requirements and education tasks. Perfection of the teaching methods, development and progress of new forms of teaching, acquire on a modern stage an important value in the student preparation. On the condition of observance all enumerated requirements, after graduation from the institution, government should get a formed skilled specialist capable independently and together with colleagues to accept the self-weighted decisions in a certain real situation, using in their professional activity those high spiritual qualities, which chould formed and developed his teachers in the process of educating, taking into account changes in our society
Evidence of Color Coherence Effects in W+jets Events from ppbar Collisions at sqrt(s) = 1.8 TeV
We report the results of a study of color coherence effects in ppbar
collisions based on data collected by the D0 detector during the 1994-1995 run
of the Fermilab Tevatron Collider, at a center of mass energy sqrt(s) = 1.8
TeV. Initial-to-final state color interference effects are studied by examining
particle distribution patterns in events with a W boson and at least one jet.
The data are compared to Monte Carlo simulations with different color coherence
implementations and to an analytic modified-leading-logarithm perturbative
calculation based on the local parton-hadron duality hypothesis.Comment: 13 pages, 6 figures. Submitted to Physics Letters
Search for electroweak production of single top quarks in collisions.
We present a search for electroweak production of single top quarks in the electron+jets and muon+jets decay channels. The measurements use ~90 pb^-1 of data from Run 1 of the Fermilab Tevatron collider, collected at 1.8 TeV with the DZero detector between 1992 and 1995. We use events that include a tagging muon, implying the presence of a b jet, to set an upper limit at the 95% confidence level on the cross section for the s-channel process ppbar->tb+X of 39 pb. The upper limit for the t-channel process ppbar->tqb+X is 58 pb. (arXiv
Helicity of the W Boson in Lepton+Jets ttbar Events
We examine properties of ttbar candidates events in lepton+jets final states
to establish the helicities of the W bosons in t->W+b decays. Our analysis is
based on a direct calculation of a probability that each event corresponds to a
ttbar final state, as a function of the helicity of the W boson. We use the 125
events/pb sample of data collected by the DO experiment during Run I of the
Fermilab Tevatron collider at sqrt{s}=1.8 TeV, and obtain a longitudinal
helicity fraction of F_0=0.56+/-0.31, which is consistent with the prediction
of F_0=0.70 from the standard model
Hard Single Diffraction in pbarp Collisions at root-s = 630 and 1800 GeV
Using the D0 detector, we have studied events produced in proton-antiproton
collisions that contain large forward regions with very little energy
deposition (``rapidity gaps'') and concurrent jet production at center-of-mass
energies of root-s = 630 and 1800 Gev. The fractions of forward and central jet
events associated with such rapidity gaps are measured and compared to
predictions from Monte Carlo models. For hard diffractive candidate events, we
use the calorimeter to extract the fractional momentum loss of the scattered
protons.Comment: 11 pages 4 figures. submitted to PR
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