Search results for " operations"
showing 10 items of 1066 documents
Die Anwendung der Dynamischen Optimierung bei der Sozial-Sanitären Bezirkseinteilung
1979
Nach einer kurzen Analyse des Problems der optimalen Aufteilung eines geographischen Gebietes in sozial-sanitare Bezirke wird in der vorliegenden Arbeit fur die Losung eines solchen Problems ein Modell dynamischer Programmierung verwendet. Es werden dann zwei Algorithmen vorgeschlagen: der erste, der von der territorialen Einheit ausgeht, soll die zulassigen sozial-sanitaren Bezirke unter Berucksichtigung der Faktoren Nahe, Dichte und begrenzter Bevolke-rungsunterschied ermitteln; der zweite errechnet jene Gesamtheit der zulassigen Bezirke, die, jede territoriale Einheit nur einmal „deckend“, eine Zielfunktion auf ein Minimum reduziert, die das Gleichgewicht zwischen Angebot und Nachfrage d…
Die Methode der „direkten Koeffizientenanpassung“ (μ-Form) des Separable Programming
1970
Zur approximativen Losung von Optimierungsproblemen mit trennbaren nichtlinearen Funktionen (Separable Programming) werden haufig modifizierte Methoden der linearen Planungsrechnung verwendet. Dabei ersetzt man die nichtlinearen Funktionen durch lineare Streckenzuge. Fur diese polygonale Approximation werden in der Literatur die sog.λ-Form und die sog.δ-Form vorgeschlagen, die jedoch eine aufwendige Datenorganisation erfordern. In diesem Beitrag soll eine kompaktere Organisationsform (μ-Form) vorgeschlagen werden. Zu ihrer Durchfuhrung werden die Rechenregeln der Upper-Bounding-Technique und die Regeln zur nachtraglichen Anderung von Matrixelementen verwendet. Der Vorteil gegenuber derλ-For…
Improving the Representativeness of a Simple Random Sample: An Optimization Model and Its Application to the Continuous Sample of Working Lives
2020
This paper proposes an optimization model for selecting a larger subsample that improves the representativeness of a simple random sample previously obtained from a population larger than the population of interest. The problem formulation involves convex mixed-integer nonlinear programming (convex MINLP) and is, therefore, NP-hard. However, the solution is found by maximizing the size of the subsample taken from a stratified random sample with proportional allocation and restricting it to a p-value large enough to achieve a good fit to the population of interest using Pearson&rsquo
Inventory record inaccuracy in supply chains: the role of workers' behavior
2014
Purpose – The purpose of this paper is to explore the effect of inventory record inaccuracy due to behavioral aspects of workers on the order and inventory variance amplification. Design/methodology/approach – The authors adopt a continuous-time analytical approach to describe the effect of inbound throughput on the inventory and order variance amplification due to the workload pressure and arousal of workers. The model is numerically solved through simulation and results are analyzed with statistical general linear model. Findings – Inventory management policies that usually dampen variance amplification are not effective when inaccuracy is generated due to workers’ behavioral aspects. Sp…
Basis for a general theory of organizations
2011
Purpose – The purpose of this paper is to identify the conceptual basis shared by different theories, regardless of the unit of analysis they specifically adopt. The different ontological choice (or different segment of reality studied by each theory) does not hinder conceptual common ground for a good number of organisational theories.Design/methodology/approach – The paper highlights the importance of hierarchical, social and institutional relations and of the technological, cognitive, social and institutional contents. It looks at the common conceptual contents of the two main theories examined, and those of a wide set of other theories addressed here. Both of the theories examined are i…
Bio-Eco-Analysis for Risk Factors using GIS Software
2013
Agriculture is a business sector ideally suited for the application of Geographic Information Systems (GIS) because it is natural resource based, requires the movement, distribution, and/or utilization of large quantities of products, goods, and services, and is increasingly required to record details of its business operations from the field to the marketplace. Nearly all agricultural data has some form of spatial component, and a GIS allows you to visualize information that might otherwise be difficult to interpret. Environment has a major impact on agriculture. In this paper we presented how GIS software can be used to analyze risk factors that influence agricultural production naturally…
Urban smart mobility in the scientific literature — bibliometric analysis
2018
Abstract This article aims at identification of the main trends in scientific literature characterising urban smart mobility, on the basis of bibliometric analysis of articles published in the ISI Web of Science and Scopus databases. The study period was set from 2000 to 2017. Authors used a basic technique of the bibliometric analysis of the scientific literature characterising urban smart mobility with the support of the VOSviewer software. The analysis included the number of publications, citation analysis, research area analysis and the most frequent keywords. The analysis led to taking notice of current research trends dealing with the urban smart mobility. The core of the paper is a t…
Financial institutions’ risk profile and contribution to the sustainable development goals
2021
This study analyses the impact of Spanish financial institutions’ risk profile on their contribution to the 2030 Agenda. Financial institutions play a significant role in ensuring financial inclusion and sustainable economic growth and usually incorporate environmental and social considerations into their risk management systems. The results show that financial institutions with less capital risk, with lower management efficiency and with higher market risk usually make higher contributions to the Sustainable Development Goals (SDGs), according to their sustainability reports. The novel aspect of the present study is that it identifies the risk profile of financial institutions that incorpo…
Stochastic dynamical modelling of spot freight rates
2014
Based on empirical analysis of the Capesize and Panamax indices, we propose different continuous-time stochastic processes to model their dynamics. The models go beyond the standard geometric Brownian motion, and incorporate observed effects like heavy-tailed returns, stochastic volatility and memory. In particular, we suggest stochastic dynamics based on exponential Levy processes with normal inverse Gaussian distributed logarithmic returns. The Barndorff-Nielsen and Shephard stochastic volatility model is shown to capture time-varying volatility in the data. Finally, continuous-time autoregressive processes provide a class of models sufficiently rich to incorporate short-term persistence …
Improving e-economy by regional governments
2014
Purpose – The purpose of this paper is to analyse and assess a government support programme for business innovation in a very peripherical European region: the Spanish region of Andalucía. Design/methodology/approach – Endogenous development approach is used to categorize the main public and private actions included in the government ICT support programme. Cross-time analysis has been carried out by using three territorial indicators of diffusion and effective use of ICT: the physical aspect, refereed to the infrastructures used as a base for the information society development (infrastructures, technology and equipment); the actors and their degree of organization (firms present on the in…