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Influence of wood properties and technological parameters of processing on cutting power in milling of thermally modified beechwood
Mandi? Marija,Todorovi? Neboj?a,PopadiRanko,Danon Gradimir
Glasnik ?umarskog Fakulteta , 2011, DOI: 10.2298/gsf1104109m
Abstract: The paper presents results of influence of thermal modification on cutting power required for milling wood processing. The experiment was conducted for the different treatment temperatures (170°C, 190°C and 210°C) and different technological parameters of processing (feed and cutting depth). Cutting powers during milling were measured on four groups of beech wood samples, dimensions 35×16×400 mm, separately for heartwood and sapwood. The following mechanical and physical properties of the processed samples were tested: bending properties (modulus of rupture and modulus of elasticity), cross-sectional and tangential hardness, and air-dry density. The measuring device used for measuring, monitoring and displaying cutting power was developed at the Wood Machining Centre at the Faculty of Forestry in Belgrade. The results point out the differences in the powers required for processing heat-treated wood compared to untreated wood. The analysis shows that with the increase in treatment temperature, the required cutting powers decrease.
An important anniversary in linguistics
Bugarski Ranko
Ju?noslovenski Filolog , 2008, DOI: 10.2298/jfi0864035b
Abstract: In 1957 two ground-breaking books were published in the field of linguistics Chomsky's Syntactic Structures and Lado's Linguistics Across Cultures, which have strongly influenced the development of theoretical and applied linguistics respectively over the past half-century. This paper briefly compares their widely different approaches, noting also certain points of contact that subsequent research has revealed. Substantial segments of these investigations are then presented through an analysis of the four key words in the titles of these two books. The article ends with a few fragments of the author's personal reminiscences concerning Chomsky and Lado.
Safety alternating automata on data words
Ranko Lazic
Computer Science , 2008,
Abstract: A data word is a sequence of pairs of a letter from a finite alphabet and an element from an infinite set, where the latter can only be compared for equality. Safety one-way alternating automata with one register on infinite data words are considered, their nonemptiness is shown EXPSPACE-complete, and their inclusion decidable but not primitive recursive. The same complexity bounds are obtained for satisfiability and refinement, respectively, for the safety fragment of linear temporal logic with freeze quantification. Dropping the safety restriction, adding past temporal operators, or adding one more register, each causes undecidability.
The reachability problem for vector addition systems with a stack is not elementary
Ranko Lazic
Computer Science , 2013,
Abstract: By adapting the iterative yardstick construction of Stockmeyer, we show that the reachability problem for vector addition systems with a stack does not have elementary complexity. As a corollary, the same lower bound holds for the satisfiability problem for a two-variable first-order logic on trees in which unbounded data may label only leaf nodes. Whether the two problems are decidable remains an open question.
Reaction of children and adults to violence in school
Plut Dijana,Popadi? Dragan
Zbornik Instituta za Pedago?ka Istra?ivanja , 2007, DOI: 10.2298/zipi0702347p
Abstract: The aim of this research is to describe the reaction of pupils and adults who work in school to violence. Reactions to violence, aimed at the child personally, have to be differentiated from the reactions to the violent scenes that the child witnesses. The analyzed data, collected in the questionnaires within the program of fighting violence which was started by UNICEF in 2005, comprise the answers of 25.056 pupils and 4.793 adults from 71 schools in Serbia. The results indicate that the pupils react to violence inconsistently and that in their repertoire they have both constructive and non-constructive ways of reacting. One half of the pupils are ready to seek help from others in case of being in danger, and widespread are also those reactions (answering by aggression or submissiveness) which substantiate further violence. Every tenth pupil who is a violence victim just tolerates and conceals violence. If they witness violence, 11% of the pupils consequently distance themselves from helping. The pupils who are violence victims do not feel abandoned by their peers, 73% of them said that their friends helped them. Although adults themselves estimate highly their own readiness and the ability to react to violence, the measures undertaken by them are not assessed well on the part of pupils. In the conclusion, there is the elaboration of all the measures which can be used to stop self-reproduction of violent behavior in school and the emphasis on the need for the programs for prevention of school violence which would be based on the inclusion of the whole school collective, and especially pupils.
Testicular seminoma presenting with duodenal perforation: a case report
Ranko Miocinovic, Ronney Abaza
Journal of Medical Case Reports , 2008, DOI: 10.1186/1752-1947-2-294
Abstract: We describe an unusual case of duodenal perforation as the presenting manifestation of metastatic classic type seminoma in a 45-year-old man.Germ cell tumor diagnosis should be considered when an ulcerating small bowel mass is identified in a young man.Testicular germ cell tumor metastasis to the upper gastrointestinal (GI) tract is uncommon (<5%), and its likelihood is related to the histologic type of the primary neoplasm [1]. Non-seminomatous germ cell tumors are much more likely to spread to the gastrointestinal (GI) tract than seminomas [2]. In their series of 25 patients with GI tract involvement, Chait et al. reported the primary neoplasms to be combinations of embryonal carcinoma, teratoma, and choriocarcinoma [3]. The most commonly observed metastatic sites of the GI tract include the small intestine and duodenum [2,4]. Different modes of spread have been observed, but direct extension from the retroperitoneal lymph nodes is more frequent than peritoneal seeding or hematogenous spread [3]. GI complaints such as intestinal obstruction, volvulus, intussusception, and hemorrhage resulting from metastatic testicular neoplasms are the most common manifestations of the disease [2]. Although small bowel ulceration secondary to metastatic seminoma has been previously reported, it is very uncommon [1,5,6]. We report a case of classic type seminoma tumor presenting primarily as perforation of the duodenum and acute abdomen.A 45-year-old man presented with acute respiratory failure, hypotension, rigid abdomen, and a hard, erythematous, and tender 14 cm right inguinoscrotal mass. Initial differential diagnoses included incarcerated hernia and testicular cancer. Further information regarding the mass could not be elicited due to the patient's altered mental status and critical condition requiring immediate intubation. Plain abdominal radiograph was unremarkable and chest radiograph revealed two large pulmonary nodules suspicious for malignancy. The patient's laboratory
On Optimization Control Parameters in an Adaptive Error-Control Scheme in Satellite Networks
Ranko Vojinovi?,Aleksandar Obradovi?
Microwave Review , 2011,
Abstract: This paper presents a method for optimization of control parameters of an adaptive GBN scheme in error-prone satellite channel. Method is based on the channel model with three state, where channel have the variable noise level.
Cursive word raw segmentation based on scanning Skew slots
Babi? Ranko V.
Journal of Automatic Control , 2006, DOI: 10.2298/jac0601051b
Abstract: In this paper we present an outline of a method for low-level structural analysis of cursive words by scanning skew slots which produce histograms or word profiles. Having different angles slots can detect corresponding structural details - writing strokes and their directions. The word baseline which serves as a reference for slot angles, can be easily revealed Also from word profiles taken by different slots we can get candidate spots for preliminary word segmentation. Although very simple this segmentation approach does not request any preprocessing of input bitmap image, including deskew, deslant or smoothing, but it is not resistant on patch noise. In the same manner it is possible to structurally examine isolated word segments without interference with neighboring ones, in order to combine prominent details from various histograms and get lexicon-like segment description. Finally, we announce further improvement of analytic abilities of this method through partial histograms which more successfully cope with specific structural cases.
Nnyaladzi Batisani,Ogonne Ranko
Journal of Urban and Environmental Engineering , 2012,
Abstract: Urban inter-race environmental injustice is a well-researched field particularly in the northern hemisphere. However, few studies have addressed intra-race urban environmental injustice especially within a developing country setting. An appreciation of the type and extent of this injustice is needed to help policymakers and city planners curb and mitigate its negative effects at this infancy stage before getting worse with economic development. The goal of this paper is to determine the presence and extent of environmental injustice in Gaborone city. To reach this goal, the paper inventories hazardous facilities across the city and also determines the spatial viability of exposure to hazardous facilities with socioeconomic status across the city. The results agree with work from elsewhere but on inter-race, showing disparities in hazards exposure among different socio-economic groups. The paper discusses policies that city planners could adopt to prevent and also minimize the effects of this injustice.
LTL with the Freeze Quantifier and Register Automata
Stephane Demri,Ranko Lazic
Computer Science , 2006,
Abstract: A data word is a sequence of pairs of a letter from a finite alphabet and an element from an infinite set, where the latter can only be compared for equality. To reason about data words, linear temporal logic is extended by the freeze quantifier, which stores the element at the current word position into a register, for equality comparisons deeper in the formula. By translations from the logic to alternating automata with registers and then to faulty counter automata whose counters may erroneously increase at any time, and from faulty and error-free counter automata to the logic, we obtain a complete complexity table for logical fragments defined by varying the set of temporal operators and the number of registers. In particular, the logic with future-time operators and 1 register is decidable but not primitive recursive over finite data words. Adding past-time operators or 1 more register, or switching to infinite data words, cause undecidability.
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