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Found 6289 publications

Measuring and modeling the dynamic behavior of Danube Sands

No authors available

Publication Name: 18th International Conference on Soil Mechanics and Geotechnical Engineering: Challenges and Innovations in Geotechnics, ICSMGE 2013

Publication Date: 2013-01-01

Volume: 2

Issue:

Page Range: 1575-1578

Description:

The adaptation of Eurocode 8 and development of high speed rail system in Hungary has created a greater need to define dynamic behavior of local soil groups. Danube sands compose an important segment of these soils and present the geotechnical engineer with several design challenges. The soils are present at river crossings and major development parcels throughout Hungary. Although the engineering behavior of these sands can vary over a wide range, they retain some common characteristics that will help the engineer to make decisions about geotechnical and structural designs. Samples of Danube sands were brought in the laboratory for dynamic testing, which included resonant column and torsional simple shear testing. This paper summarizes the dynamic behavior of this typical local soil group with emphasis on the dynamic properties themselves. Researches will find the methods and approach to evaluating properties helpful in their work while design engineers will understand how these properties are applied.

Open Access: No

DOI: DOI not available

Mucosal healing effect of mesalazine granules in naproxen-induced small bowel enteropathy

Milán Szalai Valéria Kovács Istvan Racz Henriett Regoczi Gyongyi Kiss Zoltán Horváth

Publication Name: World Journal of Gastroenterology

Publication Date: 2013-01-01

Volume: 19

Issue: 6

Page Range: 889-896

Description:

AIM: To investigate the effect of mesalazine granules on small intestinal injury induced by naproxen using capsule endoscopy (CE). METHODS: This was a single center, non-randomized, open-label, uncontrolled pilot study, using the PillCam SB CE system with RAPID 5 software. The Lewis Index Score (LIS) for small bowel injury was investigated to evaluate the severity of mucosal injury. Arthropathy patients with at least one month history of daily naproxen use of 1000 mg and proton pump inhibitor co-therapy were screened. Patients with a minimum LIS of 135 were eligible to enter the 4-wk treatment phase of the study. During this treatment period, 3 × 1000 mg/d mesalazine granules were added to ongoing therapies of 1000 mg/d naproxen and 20 mg/d omeprazole. At the end of the 4-wk combined treatment period, a second small bowel CE was performed to re-evaluate the enteropathy according to the LIS results. The primary objective of this study was to assess the mucosal changes after 4 wk of mesalazine treatment. RESULTS: A total of 18 patients (16 females), ranging in age from 46 to 78 years (mean age 60.3 years) were screened, all had been taking 1000 mg/d naproxen for at least one month. Eight patients were excluded from the mesalazine therapeutic phase of the study for the following reasons: the screening CE showed normal small bowel mucosa or only insignificant damages (LIS < 135) in five patients, the screening esophagogastroduodenoscopy revealed gastric ulcer in one patient, capsule technical failure and incomplete CE due to poor small bowel cleanliness in two patients. Ten patients (9 female, mean age 56.2 years) whose initial LIS reached mild and moderate-to-severe enteropathy grades (between 135 and 790 and ≥ 790) entered the 4-wk therapeutic phase and a repeat CE was performed. When comparing the change in LIS from baseline to end of treatment in all patients, a marked decrease was seen (mean LIS: 1236.4 ± 821.9 vs 925.2 ± 543.4, P = 0.271). Moreover, a significant difference between pre-and post-treatment mean total LIS was detected in 7 patients who had moderate-tosevere enteropathy gradings at the inclusion CE (mean LIS: 1615 ± 672 vs 1064 ± 424, P = 0.033). CONCLUSION: According to the small bowel CE evaluation mesalazine granules significantly attenuated mucosal injuries in patients with moderate-to-severe enteropathies induced by naproxen. © 2013 Baishideng. All rights reserved.

Open Access: Yes

DOI: 10.3748/wjg.v19.i6.889

Investigation on the tribological behavior of thermal sprayed coatings applied to cylinder liners - Influence of chromium content on wear resistance of plasma transferred wire arc coatings

No authors available

Publication Name: 5th World Tribology Congress, WTC 2013

Publication Date: 2013-01-01

Volume: 1

Issue:

Page Range: 305-308

Description:

Open Access: No

DOI: DOI not available

Testing the speed-up of parallel discrete event simulation in heterogeneous execution environments

No authors available

Publication Name: 11th International Industrial Simulation Conference 2013, ISC 2013

Publication Date: 2013-01-01

Volume:

Issue:

Page Range: 101-107

Description:

This paper deals with the experimental testing and verification of the earlier proposed load balancing and coupling factor criteria for the conservative parallel discrete event simulation in heterogeneous execution environments whether they can ensure a good speed-up. The definition of the relative speed-up is extended to the heterogeneous systems in a natural way. This definition is used to measure the efficiency of the parallel simulation executed by heterogeneous systems. A closed queueing network is used as the simulation model, and it is executed on different heterogeneous test systems. Among several scenarios, it is demonstrated on the example of a heterogeneous system containing 87 CPU cores of 5 different types that a good speed-up can be achieved using the load balancing and coupling factor criteria. It is shown that the extension of the definition of the relative speed-up to the heterogeneous systems made it easy to judge the speed-up of parallel discrete event simulation in heterogeneous execution environments.

Open Access: No

DOI: DOI not available

Single-stroke character recognition with fuzzy method

János Botzheim A. Tormási

Publication Name: Studies in Computational Intelligence

Publication Date: 2013-01-01

Volume: 417

Issue: Unknown

Page Range: 27-46

Description:

In this paper an on-line single-stroke recognition method based on fuzzy logic is introduced. Each of the characters is defined by only one nine dimensional fuzzy rule. In addition to the low resource requirement the solution is able to satisfy many of the user's current demands in handwriting recognizers, like speed and learning. Eight of the nine features are extracted using a four-by-four grid. For the learning phase we designed a new punish/reward bacterial evolutionary algorithm which tunes the character parameters represented by fuzzy sets. © 2013 Springer-Verlag Berlin Heidelberg.

Open Access: Yes

DOI: 10.1007/978-3-642-28959-0_2

Improving performance prediction of parallel and distributed discrete event simulation: A rough sets-based approach

No authors available

Publication Name: 11th International Industrial Simulation Conference 2013, ISC 2013

Publication Date: 2013-01-01

Volume:

Issue:

Page Range: 95-100

Description:

The rapid growth of complexity of communication networks - including grids, cloud systems and services - increases the need for the use and performance prediction of parallel and distributed discrete event simulation. The paper aims at the decreasing the overall cost of simulation by improving the performance prediction of simulation particularly for the phases with uncertain and vague information. Involving rough sets-based methods, the paper introduces how the efficiency of the well known coupling factor method of the performance prediction of parallel and distributed simulation can be improved. According to the presented results, the prediction can merely be based on the maintainable lookahead feature of the designed simulation model. Using the rough set analysis, the paper also describes how the number of simulation experiments necessary for prediction can be limited without the decrease of accuracy of prediction.

Open Access: No

DOI: DOI not available

Correlation between permanent deformation-related performance parameters of asphalt concrete mixes and binders

Kálmán Adorjányi Peter Fuleki

Publication Name: Central European Journal of Engineering

Publication Date: 2013-01-01

Volume: 3

Issue: 3

Page Range: 534-540

Description:

This paper examines methods to predict the performance of hot asphalt concrete mixes based on performance parameters of binders. Specifically, relationships between binder parameters determined from multiple stress creep and recovery tests were correlated to the creep parameters of hot asphalt concrete mixes obtained from cyclic load compression testing. For the determination of creep parameters, a modified expression of the creep curve is proposed to cover the entire spectrum of permanent deformation; including the tertiary creep phase. Non-recoverable compliance, unrecovered strain, and recoverable strain of binders show good correlation to creep parameters of hot asphalt concrete mixes such as creep rate and high temperature performance ratio. Additionally, unrecovered strain and non-recoverable compliance of binders correlates well with mean rut depth of asphalt concrete mixes. However, no correlation has been detected between the difference in non-recoverable compliance of binders and permanent deformation parameters of asphalt concrete mixes.

Open Access: Yes

DOI: 10.2478/s13531-012-0073-6

Performance evaluation of wire pairs in telecommunications networks by fuzzy and evolutionary models

Ferenc Lilik L. T. Kóczy

Publication Name: IEEE AFRICON Conference

Publication Date: 2013-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

This paper is dealing with a new approach for the performance evaluation of symmetrical wire pairs of telecommunications access networks. In this method the determination of the available data transmission rates is performed by fuzzy inference systems. The telecommunications environment and the physical parameters that influence the transmission are briefly reviewed. Two methods used for the creation of the rule bases and an easy way for the evaluation for the observations of the physical system are presented. © 2013 IEEE.

Open Access: Yes

DOI: 10.1109/AFRCON.2013.6757602

Robot edutainment on walking motion of multi-legged robot

János Botzheim Noriko Takase Naoyuki Kubota

Publication Name: Proceedings 2013 2nd International Conference on Robot Vision and Signal Processing Rvsp 2013

Publication Date: 2013-01-01

Volume: Unknown

Issue: Unknown

Page Range: 229-233

Description:

In this paper we present a short-term robot edutainment for junior high school students. The theme of this robotic course is the walking motion of multi-legged robot. We provided the students with the robot educational material that contains assembled leg parts. The students devised the configuration and motion of the robot using given constraints. We conducted a robot contest for the students to present their results in this robot course. As a result, by using limited materials, the students were able to produce a robot that shows their ingenuity. We could observe from a questionnaire about the course that the students were interested in science and robots. © 2013 IEEE.

Open Access: Yes

DOI: 10.1109/RVSP.2013.59