Opin vísindi
Opin vísindi er varðveislusafn vísindaefnis og doktorsritgerða í opnum aðgangi á vegum íslenskra háskóla og Landsbókasafns Íslands - Háskólabókasafns.
Opinn aðgangur að rannsóknaniðurstöðum er í samræmi við 10. gr. laga nr. 3/2003 um opinberan stuðning við vísindarannsóknir sem og kröfur innlendra og erlendra rannsóknasjóða. Markmiðið með opnum aðgangi er að niðurstöður rannsókna séu aðgengilegar sem flestum óhindrað og án endurgjalds á rafrænu formi. Vistun í varðveislusafninu er varanleg og ætlað að tryggja aðgang að vísindaefni íslenskra háskóla í opnum aðgangi um ókomna tíð. Varðveislusafnið Opin vísindi er tengt við rannsóknagáttina IRIS og rannsóknaniðurstöður í opnum aðgangi sem eru skráðar í IRIS eru um leið vistaðar og gerðar aðgengilegar til framtíðar í varðveislusafninu. Með því að safna þessu efni saman í eitt safn verður aðgangur að því einfaldur og þægilegur fyrir alla sem vilja kynna sér það og geta þannig notið þess öfluga vísindastarfs sem fram fer í háskólum landsins.
Varðveislusafnið er OpenAIRE / OpenAIREplus samhæft og samrýmist kröfum sem gerðar eru um birtingu rannsóknaniðurstaðna úr verkefnum sem styrkt eru úr evrópsku rannsóknaáætlununum FP7 og H2020.
Varðveislusafnið notar opna hugbúnaðinn DSpace.
Opinn aðgangur að rannsóknaniðurstöðum er í samræmi við 10. gr. laga nr. 3/2003 um opinberan stuðning við vísindarannsóknir sem og kröfur innlendra og erlendra rannsóknasjóða. Markmiðið með opnum aðgangi er að niðurstöður rannsókna séu aðgengilegar sem flestum óhindrað og án endurgjalds á rafrænu formi. Vistun í varðveislusafninu er varanleg og ætlað að tryggja aðgang að vísindaefni íslenskra háskóla í opnum aðgangi um ókomna tíð. Varðveislusafnið Opin vísindi er tengt við rannsóknagáttina IRIS og rannsóknaniðurstöður í opnum aðgangi sem eru skráðar í IRIS eru um leið vistaðar og gerðar aðgengilegar til framtíðar í varðveislusafninu. Með því að safna þessu efni saman í eitt safn verður aðgangur að því einfaldur og þægilegur fyrir alla sem vilja kynna sér það og geta þannig notið þess öfluga vísindastarfs sem fram fer í háskólum landsins.
Varðveislusafnið er OpenAIRE / OpenAIREplus samhæft og samrýmist kröfum sem gerðar eru um birtingu rannsóknaniðurstaðna úr verkefnum sem styrkt eru úr evrópsku rannsóknaáætlununum FP7 og H2020.
Varðveislusafnið notar opna hugbúnaðinn DSpace.
Nýlega bætt við
Groin hernia surgery in northern Ghana - Humanitarian mission of Polish surgeons in Tamale
(2015-03-01) Mitura, Kryspin; Kozieł, Sławomir; Pasierbek, Michał; Department of Engineering
Availability of surgical care in Africa is severely limited. This is due to the lack of surgeons and a small number of public hospitals. Only 25 out of 100,000 patients with inguinal hernia undergo a surgical treatment. As many as 65% of inguinal hernia repairs are performed urgently because of incarceration. Among patients with incarceration who do not reach the hospital there is recorded as many as 87 deaths per 100 cases. In order to improve the availability of treatment of inguinal hernia in Africa, humanitarian medical missions involving surgeons from Europe are organized. During regular visits to selected centers in Africa, they also carry out intensified treatment of patients and training of the local staff. The aim of the study was to present the experience of Polish surgeons from the humanitarian medical mission in Tamale in northern Ghana undertaken in fall of 2014. Material and methods. Surgical repair was performed in 87 patients (74 men - 85% and 13 women - 15%) between the ages of 26 to 70 years (mean 52.8 years; SD 10.3), who underwent a total of 98 inguinal hernia repairs under local anesthesia. Results. Lichtenstein procedure was performed in 93 and Desarda technique in 5 patients. Patients reported the long-term presence of hernia symptoms - from one to 7 years (mean 3.4 years, SD 1.4). In most patients, hernia occurred more than 3 years earlier (61 patients; 70%). There were no intraoperative complications. All patients were discharged the next day after surgery. There was one wound infection in postoperative period which required mesh explantation. Conclusions. Inguinal hernia commonly found in Ghana is a major issue for the inefficient health care system. Humanitarian medical missions can help to improve the treatment results, as long as they are carried out periodically and allow for training of local personnel. Scarce equipment of medical facilities in Ghana is not a significant difficulty in performing the Lichtenstein repair under the local anesthesia.
Multi-objective design optimization of planar Yagi-Uda antenna using physics-based surrogates and rotational design space reduction
(2015) Koziel, Slawomir; Bekasiewicz, Adrian; Leifsson, Leifur; Department of Engineering
A procedure for low-cost multi-objective design optimization of antenna structures is discussed. The major stages of the optimization process include: (i) an initial reduction of the search space aimed at identifying its relevant subset containing the Pareto-optimal design space, (ii) construction-using sampled coarse-discretization electromagnetic (EM) simulation data-of the response surface approximation surrogate, (iii) surrogate optimization using a multi-objective evolutionary algorithm, and (iv) the Pareto front refinement. Our optimization procedure is demonstrated through the design of a planar quasi Yagi-Uda antenna. The final set of designs representing the best available trade-offs between conflicting objectives is obtained at a computational cost corresponding to about 172 evaluations of the high-fidelity EM antenna model.
Fast optimization of integrated photonic components using response correction and local approximation surrogates
(2015) Bekasiewicz, Adrian; Koziel, Slawomir; Leifsson, Leifur; Department of Engineering
A methodology for a rapid design optimization of integrated photonic couplers is presented. The proposed technique exploits variable-fidelity electromagnetic (EM) simulation models, additive response correction for accommodating the discrepancies between the EM models of various fidelities, and local response surface approximations for a fine tuning of the final design. A specific example of a 1,555 nm coupler is considered with an optimum design obtained at a computational cost corresponding to about 24 high-fidelity EM simulations of the structure.
Computational science at the gates of nature, preface for ICCS 2015
(2015) Koziel, Slawomir; Leifsson, Leifur; Lees, Michael; Krzhizhanovskaya, Valeria V.; Dongarra, Jack; Sloot, Peter M.A.; Department of Engineering
Nested space mapping technology for expedite EM-driven design of compact RF/microwave components
(2014) Bekasiewicz, Adrian; Koziel, Slawomir; Kurgan, Piotr; Leifsson, Leifur; Department of Engineering
A robust simulation-driven methodology for rapid and reliable design of RF/microwave circuits comprising compact microstrip resonant cells (CMRCs) is presented. We introduce a nested space mapping (NSM) technology, in which the inner space mapping layer is utilized to improve the generalization capabilities of the equivalent circuit model corresponding to a constitutive element of the circuit under consideration. The outer layer enhances the surrogate model of the entire structure under design. We demonstrate that NSM significantly improves performance of surrogate-based optimization of composite RF/microwave structures. It is validated using two examples of UWB microstrip matching transformers (MTs) and compared to other competitive surrogate-assisted methods attempting to solve the problem of compact RF/microwave component design.
Flokkar í Opnum vísindum
Veldu flokk til að skoða.
- University of Iceland
- University of Akureyri
- Bifröst University
- Hólar University College
- IRIS
- Agricultural University of Iceland
- National and University Library of Iceland
- Iceland University of the Arts