Search results for "Inventory"
showing 10 items of 455 documents
Robust control of uncertain multi-inventory systems via linear matrix inequality
2008
We consider a continuous time linear multi inventory system with unknown demands bounded within ellipsoids and controls bounded within ellipsoids or polytopes. We address the problem of "-stabilizing the inventory since this implies some reduction of the inventory costs. The main results are certain conditions under which "-stabilizability is possible through a saturated linear state feedback control. All the results are based on a Linear Matrix Inequalities (LMIs) approach and on some recent techniques for the modeling and analysis of polytopic systems with saturations.
Average flow constraints and stabilizability in uncertain production-distribution systems
2009
We consider a multi-inventory system with controlled flows and uncertain demands (disturbances) bounded within assigned compact sets. The system is modelled as a first-order one integrating the discrepancy between controlled flows and demands at different sites/nodes. Thus, the buffer levels at the nodes represent the system state. Given a long-term average demand, we are interested in a control strategy that satisfies just one of two requirements: (i) meeting any possible demand at each time (worst case stability) or (ii) achieving a predefined flow in the average (average flow constraints). Necessary and sufficient conditions for the achievement of both goals have been proposed by the aut…
Hating among adolescents: Common contributions of cognitive distortions and maladaptive personality traits
2019
The phenomenon of hating is becoming common in adolescence, but it has been rarely investigated. The study aimed to examine the relationships between hating behaviors, maladaptive personality traits, and cognitive distortions, and to explore whether cognitive distortions might intervene in the relationship between personality traits and hating. Method: Participants (200 boys and 202 girls) completed the Hating Adolescents Test (HAT), the Personality Inventory for DSM-5-Brief Form-Children (PID-5), and the How I Think Questionnaire (HITQ). Results: Preliminary results showed significant gender differences in the study’s variables: boys reported higher scores than girls on hating and on cogni…
The role of forest fire severity on vegetation recovery after 18 years. Implications for forest management of Quercus suber L. in Iberian Peninsula
2016
Wildfires are a widespread phenomenon in Mediterranean environments. Wildfires result in different fire severities, and then in contrasting plant cover and floristic composition. This paper analyses the recovery of the vegetation eighteen years after a wildfire in Catalonia. The Pinus pinaster ssp. forest was affected by three different severities in July 1994, and studied the spring of 1995 and again in 2008. After eighteen years (2012), our research found that burnt sites constitute a dense forest with a broad variety of species, including many young pines, shrubs and herbaceous plants, but that the risk of fire remains very high, due to the large quantity of fuel and the flammability of …
Assessing the biomass of shrubs typical of Mediterranean pre-forest communities
2012
One of the most outstanding issues of current environmental research is the need of reliable assessments of carbon stock (i.e. above-ground (a.g.) and below-ground biomass, deadwood, litter, and organic soil matter) within forest ecosystems. Although shrub vegetation plays an important role in accumulating carbon in many Mediterranean environments, there is still very little knowledge on the carbon they store. In this article, we analyze the a.g. carbon stock of several Mediterranean shrubby communities in Sicily (Italy), dominated by Pistacia lentiscus, Chamaerops humilis, Euphorbia dendroides and Spartium junceum. Plant samples for each species were selected, and morphometric attributes (…
Mapping traditional cultural landscapes in the Mediterranean area using a combined multidisciplinary approach: Method and application to Mount Etna (…
2011
Traditional cultural landscapes (TCLs) are prominent in Mediterranean countries. The abundance of this landscape type, however, is not reflected by broad-scale inventories and mapping tools. The aim of this paper is to highlight the need for a multidisciplinary approach to landscape analysis, with special reference to the Mediterranean area. We propose an integrated method that combines deductive and inductive processes to define and map TCLs in a study area (Mount Etna, Sicily, Italy). We also develop a procedure to characterize the primary components of these landscapes as a reference to be used in cultural-landscape descriptions. For mapping purposes, three different scales of analysis w…
THE DEVELOPMENT OF A QUESTIONNAIRE ON METACOGNITION FOR STUDENTS IN SECONDARY SCHOOL
2014
Interest in the role of metacognition has been steadily rising in most forms of education. The present paper focuses on the construction of a questionnaire for measuring metacognitive knowledge, metacognitive regulation and metacognitive responsiveness among Secondary school students and the subsequent process of testing to determine its validity. The questionnaire was administered to 4119 students, (230 school classes) in various types of schools in Palermo, Italy. The general aim of the study was to reveal the effects of teaching specific learning strategies to students on their metacognitive knowledge, their use of metacognitive skills, and their success. The data gathered were analyzed …
Content Management in Organizations
2005
Content management may be characterized as “a variety of tools and methods that are used together to collect, process, and deliver content of diverse types” (McIntosh, 2000, p. 1). At least three differing approaches on content management may be identified: 1) Web content management, 2) Document management, and 3) Utilization of structured documents.
Harvesting and recovery decisions under uncertainty
2010
Abstract A stochastic forest rotation model in the Faustmann tradition is presented and exemplified. The model combines harvesting decisions with the potential to recover or clean up to restore the land after very unfavorable evolutions of the stochastic growth process. Uncertainty is shown to have a generally ambiguous effect on the optimal choice of investment strategy. It is also shown how such models can be related to theory of optimal inventory control.
A study of personality subtypes in treatment seeking obese patients
2014
Previous research has not been able to identify a distinct personality style that refers specifically to obese individuals. The purpose of this investigation was to explore whether different personality-based groups can be identified in obese individuals, as has been shown with eating disorder patients. Data were collected from 149 obese patients (BMI = 37.3, ± 6.4; 83% female) seeking dietary treatment and psychological support for their weight problems. Participants completed the Millon Clinical Multiaxial Inventory III (MCMI-III; Millon, 1997) and a battery of eight measures assessing psychological distress, mood states, eating behaviors, obesity-related quality of life, and interperson…