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Wyświetlanie 1-15 z 1916
Tytuł:
An algorithm for the solution of the traveling salesman problem via disjunctive graphs
Autorzy:
Grabowski, Józef
Powiązania:
https://bibliotekanauki.pl/articles/748529.pdf
Data publikacji:
1978
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Directed graphs (digraphs), tournaments
Scheduling theory, deterministic
Special problems of linear programming(transportation, multi-index, etc.)
Opis:
.
From the introduction: "The traveling salesman problem is a problem of combinatorial type. Although problems of this type sometimes have a relatively simple formulation, there are many difficulties associated with their solution even when the most up-to-date computers are used. In the 1970s many papers have been devoted to this problem. The purpose of the vast majority of them has been to find more effective solution algorithms. "In this paper we give the solution of the traveling salesman problem via disjunctive graphs. Up to now the elements of disjunctive graphs have been used to solve problems connected with the determination of an optimal task completion sequence.''
Źródło:
Mathematica Applicanda; 1978, 6, 13
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rodziny wieloproblemowe – charakterystyka 222 rodzin z dzielnicy Praga-Północ
Multi-problem Families - the Characteristics of 222 Families From the Warsaw District Praga-North
Autorzy:
Kossowska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/699070.pdf
Data publikacji:
1982
Wydawca:
Polska Akademia Nauk. Instytut Nauk Prawnych PAN
Tematy:
rodzina wieloproblemowa
Praga-Północ
rodzina
nieprzystosowanie społeczne
alkoholizm
przestępczość
typologia rodzin
karalność
multi-problem family
Prague-North
family
social maladjustment
alcoholism
criminality
family typology
penality
Opis:
The object of the study initiated in 1975 in the Department of Criminology of the Polish Academy of Sciences was to get acquainted with the extent of social maladjustment in the families known to be characterised by the cumulation of socially negative factors. They were, called multi-problem families. In on study primary criteria for the selection of families were alcoholism and excessive drinking, which was based on the assumption, proved by many criminological studies, that alcoholism causes the most severe disturbances in the functioning of the family. Other symptoms of social maladjustment, such as crime, prostitution, child neglect, were recognized as the derivatives of alcoholism. 222 families living in the Warsaw district Praga-North were examined, in which at least 2 adult membres were known to the police as regular excessive drinkers. Data about the families examined were gathered by means of interviews with the district constables of the police. On the grounds of the interview a questionnaire was filled in, including such data on all members of the family who were living together, as: regular excessive drinking and behavior related to it, delinquency, trouble-making and threat to the safety of their family and neighbours, attitude towards work, performance of parental duties, prostitution and other symptoms of social maladjustment. They were supplemented by the data from other official sources, among other: court records, registers of the detoxication centres, data from the juvenile section of the police regarding the state of care of the children and their social maladjustment. The majority of the multi-problem families examined inhabit poorly planned areas. The houses are mainly old, neglected, assigned for demolition (and thus not repaired). There are no bathrooms nor WCs. Many of the tenements lack running water. The housing conditions of these families as regards the density of their tenements is considerably poorer than the average of the remaining part of the district and of the entire city. The financial standing of the families, according to the police constables, is “poor” or” very poor” in over a half of the examined cases. The social and professional status of the members is low. 70% of men and 90% of women lack any vocational training. At the time of research, the examined population of 222 families consisted of 437 men and 360 women aged over 17 and 233 children aged 0-16 (over a half of them were small children aged up to 10). The extent of social maladjustment of the entire adult population is as follows: As few as 9% of the men and 37% of the women do not drink excessively. The remaining regularly drink excessively or are alcoholics. It is interesting that a substantial intensity of excessive drinking was found even among the youngest group of the examined adult males, that is those aged 17 - 20. Only 15% of the men in this age group do not drink excessively. The excessive drinking of the persons examined is connected with other symptoms of “problem drinking”. Over 57% of the men and 17% of the women were detained at the detoxication centre more than 3 times. The persons under examination also frequently have cases brought against them in the Penal Administrative Commissions because of breaking of peace when intoxicated. Over 40% of the men had such cases brought against them at least 3 times. More than a half of the men in the multi-problem families are the so-called “persons dangerous to other members of the family when drunk”. This stands for behavior such as making rows at home, beating their wives or other members of the family, turning them into the street, demolishing their flats. The population of the men is also characterized by an improper attitude towards work. Approximately 45% of them do not work though they could. On the basis of the obtained information it can be stated that they either are provided for by the others, or they live on illegal business or various odd jobs, or they profit by illegal means. In the light of the data mentioned above as to the drinking habits of the members of the families examined the question arises if any relationship can be found between their excessive drinking and their staying out of work. Approximately 92% of the men who are known to stay out of work without any reasonable cause can be recognized as alcoholics. The extent of crime in the multi-problem families is significant, with 57% of the men having been convicted at least once, and 32% - 4 times or more.  There were also 20% of the women with criminal records. Contrary to expectation, in the structure of crime of the examined population violent offences balance those against property. Among the population of the women from the problem families, 1/5 are suspected of prostitution. When discussing the social maladjustment of the women, the problem of performing maternal duties cannot possibly be ignored. 70% of the mothers of small children do not secure the care for them, and in some cases the child neglect becomes more flagrant. Only about 1/5 of the entire population of the adult members of the families examined reveal none of the symptoms mentioned above, the percentage in the case of men being as low as less than 9%. In the second part of the study an attempt is made to characterize the families from the point of view of the intensity of social maladjustment in the entire family. Among the 222 families there were 39, the members of which had no criminal record, that is, in over 80% of the families there occurs the co-existence of alcoholism and crime. In more than half of the families not even one adult member could be recognized as positive - that is, not drinking excessively, with a clear court record and regularly working. There is one such person in 54 families, 2 such persons in 36 families, and in only 15 families 3 persons were recognized as favourably meeting the above criteria. On the basis of the proceedings employed to define the degree of social maladjustment of each of the families, nearly 1/3 of them were found to reveal a very high intensity of cumulated symptoms of social maladjustment. Such families create a serious social problem to the still greater extent than the others. Analysing the educational situation in the families on the basis of their classification as regards their structure, the situation in question is found particularly unfavorable in the families where the mother regularly drinks excessively or is a prostitute. This applies particularly to the situation of small children. In nearly all the families with small children the sometimes flagrant negligence of the children was found. The mothers did not care for their children, left them without any care, did not secure for them any sufficient food nor clothing, the children having in many cases no other source of assistance. As the children grow up, their neglect and the influence of negative social patterns in the family repeatedly lead to the symptoms of social maladjustment, which increase gradually sometimes reaching very grave forms. Multi-problem families require special care and assistance of the qualified social services. This applies particularly to children who are brought up in exceptionally unfavourable conditions. An early intervention in the situation of those children is vital. It should lead to neutralizing the negative influence of family milieu, which in a great part of the cases requires the isolation of the children by placing them in a children's home. The assistance applied towards the family should also consist in financial and medical aid (including the treatment of early stages of alcoholism).
Źródło:
Archiwum Kryminologii; 1982, VIII-IX; 291-337
0066-6890
2719-4280
Pojawia się w:
Archiwum Kryminologii
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multicriterial optimization
Autorzy:
Khan, Phan Quoc
Powiązania:
https://bibliotekanauki.pl/articles/747912.pdf
Data publikacji:
1990
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Research exposition
Multi-objective and goal programming
Opis:
.
This work is a survey. Basic notions, a few words on the history and a classification of problems in multicriterial optimization are presented. Optimality conditions of various types are discussed in more detail.
Źródło:
Mathematica Applicanda; 1990, 18, 32
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Representation formulae for (C₀) m-parameter operator semigroups
Autorzy:
Zhou, Mi
Anastassiou, George
Powiązania:
https://bibliotekanauki.pl/articles/1311136.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
multi-parameter operator semigroups
representation formulae
multivariate approximation
sum of random vectors
Banach space
multiplier enlargement method
rate of convergence
second modulus of continuity
inequalities
Opis:
Some general representation formulae for (C₀) m-parameter operator semigroups with rates of convergence are obtained by the probabilistic approach and multiplier enlargement method. These cover all known representation formulae for (C₀) one- and m-parameter operator semigroups as special cases. When we consider special semigroups we recover well-known convergence theorems for multivariate approximation operators.
Źródło:
Annales Polonici Mathematici; 1996, 63, 3; 247-272
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DNA fingerprints generated by R.18.1 DNA probe in two stocks of chickens: Green Legged Patridgenous [GLP] and Rhode Island Red [RIR]
Autorzy:
Rosochacki, S J
Hillel, J
Jaszczak, K
Zawadzka, M
Powiązania:
https://bibliotekanauki.pl/articles/2046824.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-locus DNA probe
hybridization
animal breeding
poultry
molecular marker
DNA
chicken
Opis:
Hybridization of a multi-locus DNA probe, R 18.1, to genomic DNA from poultry showed a highly polymorphic fingerprint pattern. The detected DNA fingerprints are individually specific and differ between Green Legged Patridgenous (GLP) and Rhode Island Red (RIR) stock of chickens. The average numbers of detected bands in RIR were 18.68 and in GLP - 15.33, but the average band sharing levels were 0.619 and 0.431, respectively. The level of polymorphism may be connected possibly with a higher level of inbreeding in the examined stock of chicken.
Źródło:
Journal of Applied Genetics; 1997, 38, 2; 173-178
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Hilbert cube compactification of the space of retractions of the interval
Autorzy:
Uehara, Shigenori
Powiązania:
https://bibliotekanauki.pl/articles/966101.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
upper semi-continuous multi-valued function
the hyperspace of non-empty compact sets
the Hausdorff metric
the pseudo-interior
the Hilbert cube
The space of retractions
Źródło:
Colloquium Mathematicum; 1998, 78, 1; 119-122
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A System for Measuring Vertical Concentration Profiles of Gaseous Pollutants, Using Carbon Dioxide as a Case Study
Autorzy:
Micallef, A.
Deuchar, C. N.
Colls, J. J.
Powiązania:
https://bibliotekanauki.pl/articles/91042.pdf
Data publikacji:
1998
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
concentration gradient
spatial distribution
multi-level sampling
human exposure
indoor-outdoor air pollution
gradient stężenia
rozkład przestrzenny
zanieczyszczenia gazowe
Opis:
An electronically-controlled sampling system, characterised by its organ pipe design, has been developed for sampling air sequentially, at different heights within the breathing zone. Data are automatically logged at the different receptor levels, for the determination of the average vertical concentration profile of gaseous pollutants. The system has been coupled to a carbon dioxide monitor and used in a brief study of the spatial and temporal variation of indoor carbon dioxide concentration. The system can easily be extended for different heights or modified for use with other types of gas monitor. The results of a trial run, which was carried out in a coffee room, are presented and applications of the Organ Pipe Sequential Sampling (OPSS) system are discussed.
Źródło:
International Journal of Occupational Safety and Ergonomics; 1998, 4, 3; 333-346
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a robust adaptive fuzzy controller globally stabilizing the multi-input nonlinear system with state-dependent uncertainty
Autorzy:
Park, Y.
Park, G.
Powiązania:
https://bibliotekanauki.pl/articles/205909.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
sterowanie rozmyte
sterownik rozmyty adaptacyjny
układ dynamiczny
adaptive fuzzy controller
fuzzy inference
multi-input nonlinear system
robustness
state-dependent uncertainties
Opis:
In this paper a novel robust adaptive fuzzy controller is proposed for the nonlinear system with state-dependent uncertainty. Compared with the conventional adaptive fuzzy controller that determines the function which bounds the uncertainty in the system dynamics by off-line calculation on the local state space, the proposed method determines that function by the fuzzy inference so that guarantees the stability of the closed loop system globally on the whole state space. In addition the method is applied to the multi-input system. We applied the proposed method to the Burn Control of the Tokamak fusion reactor whose dynamical equations contain the state-dependent uncertainty and proved the effectiveness of the scheme by the simulation results.
Źródło:
Control and Cybernetics; 1998, 27, 4; 613-629
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Connection matrix pairs
Autorzy:
Richeson, David
Powiązania:
https://bibliotekanauki.pl/articles/1341687.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Conley index
multi-valued maps
connection matrix pairs
Morse decomposition
index filtrations
Opis:
We discuss the ideas of Morse decompositions and index filtrations for isolated invariant sets for both single-valued and multi-valued maps. We introduce the definition of connection matrix pairs and present the theorem of their existence. Connection matrix pair theory for multi-valued maps is used to show that connection matrix pairs obey the continuation property. We conclude by addressing applications to numerical analysis. This paper is primarily an overview of the papers [R1] and [R2].
Źródło:
Banach Center Publications; 1999, 47, 1; 219-232
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary Multi-Objective Pareto Optimisation of Diagnostic State Observers
Autorzy:
Kowalczuk, Z.
Suchomski, P.
Białaszewski, T.
Powiązania:
https://bibliotekanauki.pl/articles/908280.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
diagnostyka
wyodrębnienie i wykrycie błędu
algorytm genetyczny
obserwator stanów
diagnostics
fault detection and isolation
genetic algorithms
multi-objective optimisation
Pareto optimality
residuals
state observers
Opis:
A multi-objective Pareto-optimisation procedure for the design of residual generators which constitute a primary instrument for model-based fault detection and isolation (FDI) in systems of plant monitoring and control is considered. An evolutionary approach to the underlying multi-objective optimisation problem is utilised. The resulting robust observer detector allows for FDI, taking into account the issue of false alarms.
Źródło:
International Journal of Applied Mathematics and Computer Science; 1999, 9, 3; 689-709
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a multi-objective optimization problem arising from production theory
Autorzy:
Roman, Maria
Wieczorek, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1338896.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
multi-objective optimization
(weakly) efficient solution
household production
(weak) Pareto optimality
Opis:
The paper presents a natural application of multi-objective programming to household production and consumption theory. A contribution to multi-objective programming theory is also included.
Źródło:
Applicationes Mathematicae; 1998-1999, 25, 4; 411-415
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spaces of upper semicontinuous multi-valued functions on complete metric spaces
Autorzy:
Sakai, Katsuro
Uehara, Shigenori
Powiązania:
https://bibliotekanauki.pl/articles/1205236.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
space of upper semicontinuous multi-valued functions,
hyperspace of non-empty closed sets,
Hausdorff metric,
Hilbert space,
uniformly locally connected
Opis:
Let X = (X,d) be a metric space and let the product space X × ℝ be endowed with the metric ϱ ((x,t),(x',t')) = max{d(x,x'), |t - t'|}. We denote by $USCC_B(X)$ the space of bounded upper semicontinuous multi-valued functions φ : X → ℝ such that each φ(x) is a closed interval. We identify $φ ∈ USCC_B(X)$ with its graph which is a closed subset of X × ℝ. The space $USCC_B(X)$ admits the Hausdorff metric induced by ϱ. It is proved that if X = (X,d) is uniformly locally connected, non-compact and complete, then $USCC_B(X)$ is homeomorphic to a non-separable Hilbert space. In case X is separable, it is homeomorphic to $ℓ_2(2^ℕ)$.
Źródło:
Fundamenta Mathematicae; 1999, 160, 3; 199-218
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of Multi-Dimensional Discrete Systems With Varying Structure
Autorzy:
Dymkov, M.
Gaishun, I.
Powiązania:
https://bibliotekanauki.pl/articles/908265.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
układ wielowymiarowy
złożenie krzywoliniowe
stabilność
multi-dimensional systems
total solvability
curvilinear composition
stability
Opis:
A new class of multi-dimensional discrete systems with varying structureis introduced. The notions of total solvability, p_t-boundedness, p_t-stability and asymptotic stability are defined. For studying properties of the solutions for the considered systems a curvilinear composition of mappings along discrete curves is used. Total solvability conditions similar to the Frobenius ones are obtained. Sufficient conditions for p_t-stability and asymptotic stability based on the Lyapunov functional method are also established. A two-dimensional system of Volterra equations is presented as an example of equations with varying structure.
Źródło:
International Journal of Applied Mathematics and Computer Science; 1999, 9, 4; 789-799
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A differential motion planning algorithm for controlling multi-robot systems handling a common object
Autorzy:
Tzafestas, C.
Prokopiou, P.
Tzafestas, S.
Powiązania:
https://bibliotekanauki.pl/articles/205881.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
robot
cooperative robots
incremental robot motion planning
manipulator kinematic
master and two-slaves system
multi-robot kinematics
multi-robot systems
path planning
rigidity condition
Opis:
Multi-robot systems have substantially increased capabilities over single-robot systems and can handle very large or peculiar objects. This paper presents a differential (incremental) motion planning algorithm for an m-robot system (m >or=2) to cooperatively transfer an object from an initial to a desired final position / orientation by rigidly holding it at given respective points Q[sub 1], Q[sub 2],..., Q[sub m]. One of the robots plays the role of a "master" while other robots operate in the "slave" mode maintaining invariant their relative positions and orientations during the system motion. The method employs the differential displacements of the end-effector of each robot arm. Then, the differential displacements of the joints of the m robots are computed for the application of incremental motion control. The algorithm was tested on many examples. A representative of them is shown here, concerning the case of three STAUBLI RX-90L robots similar to 6-dof PUMA robots. The results obtained show the practicality and effectiveness of the method, which, however, needs particular care for completely eliminating the cumulative errors that may occur.
Źródło:
Control and Cybernetics; 2000, 29, 2; 567-584
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Method for Determining the Properties of Multi-Screen Interfaces
Autorzy:
Ngo, D.C.L.
Teo, L. S.
Byrne, J.G.
Powiązania:
https://bibliotekanauki.pl/articles/911164.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
interfejs
interfejs wieloprzesiewowy
screen design
interface aesthetics
aesthetic measures
aesthetic characteristics
multi-screen interfaces
Opis:
An important aspect of screen design is aesthetic evaluation of screen layouts. While it is conceivable to define a set of variables that characterize the key attributes of many alphanumeric display formats, such a task seems difficult for graphic displays because of their much greater complexity. This article proposes a theoretical approach to capture the essence of artists' insights with seven aesthetic measures for graphic displays. The formalized measures include symmetry, sequence, cohesion, regularity, homogeneity, rhythm, and order and complexity. The paper concludes with some thoughts on the direction which future research should take.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2000, 10, 2; 413-426
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1916

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