396,247 research outputs found
Dual polarized broadband and all dielectric partial cloaking using stacked graded index structures
No full textWe propose broadband one-dimensional optical cloaking design based on isotropic and purely dielectric non-absorbent materials. The photonic structures are formed by utilizing graded index (GRIN) concept in stacked form. All simulations are performed by finite-difference time-domain and plane wave basis frequency domain numerical methods. Indications in ray optics are also presented for the cloaking device. The refractive index distribution of the design is also obtained via effective medium theory. The cloaking devices can reroute wavelengths of light in one dimension. The rerouted light is avoided to reach the interior region of the stacked GRIN structure. Unidirectional GRIN cloaking structure demonstrates low-loss and large bandwidth characteristics. It is shown that the structure operates in dual polarization mode. Performed numerical analyses reveal the capability of cloaking devices to hide arbitrary shaped large objects from the incident light. (C) 2014 Optical Society of America
Optical Analysis of Human Eye Using Electromagnetic Wave Theory
No full textWe present a two-dimensional electromagnetic analysis of light propagation through the human eye to examine the eye's optical properties. The electromagnetic approach has intriguing advantages over the conventional and frequently implemented ray optics analysis. The chromatic, spherical, and coma aberrations and the intensity of the focused light at the retina are computed in this work via full-wave analysis. We also investigate the effects of the cornea's and lens's curved structures on the focusing mechanism. The focal length and chromatic and spherical aberrations are observed to change owing to age-related refractive index variation in the lens. In addition, the effects of the lens and curvatures of the human eye on focusing are analyzed. Consequently, for both young and old human eye lenses, the differences due to the aberration variations, curvature surfaces, and gradient index are explored by the wave approach. The intensity distributions on the retina for both on-and off-axis illumination are calculated. A strong correlation between the locations of the nerve fibers and the intensity distribution is confirmed. On the basis of the findings, we can conclude that visual impairment due to deterioration of the human eye structure is more dramatic than that due to aging. (C) 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)The authors gratefully acknowledge the financial support of the Scientific and Technological Research Council of Turkey (TUBITAK), project number 110T306. H. K. also acknowledges partial support from the Turkish Academy of Sciences.Scientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [110T306]; Turkish Academy of SciencesTurkish Academy of Science
Polarization-Independent Photonic Crystal Fabry-Perot Cavity
No full textWe present the design steps for 3D polarization-independent Fabry-Perot cavity. Inclusion of isolated dielectric rods into the limited number of holes at around the central region enables the generation of cavity that sustains both transverse electric and transverse magnetic modes. Localization of light is obtained at the same frequency for both polarizations with moderately high quality factors. Polarization-independent nanobeam cavity is expected to be a platform for studying strong light matter interaction at the wavelength scales.
Correction: A disease-specific patient reported outcome instrument for spine trauma is developed, validated and available! Re: Andrzejowski et al. Measuring functional outcomes in major trauma: can we do better? (European Journal of Trauma and Emergency Surgery, (2023), 49, 3, (1605-1606), 10.1007/s00068-022-02167-8)
No full textThe article “A disease‑specific patient reported outcome instrument for spine trauma is developed, validated and available! Re: Andrzejowski et al. Measuring functional outcomes in major trauma: can we do better?”, written by Said Sadiqi, F. Cumhur Oner, was originally published electronically on the publisher’s internet portal on 15. November 2022 without open access. With the author(s)’ decision to opt for Open Choice the copyright of the article changed on 7
The Frequency of Psychological Symptoms in the Elderly: A Cross-Sectional Field Study in Istanbul, Turkey
No full textIntroduction: Various reports have documented the psychological issues that affect the elderly. According to estimates, approximately 20% of the geriatric population experiences at least one psychological symptom or disorder. The aim of this study is to establish the frequency of psychological symptoms in the elderly population in İstanbul, Turkey.
Methods: This cross-sectional study was conducted with 350 participants aged 65 and over, between 01.02.2019 and 19.07.2019. The psychiatric symptoms of the participants were evaluated with the Symptom Check List-90 Revised (SCL-90-R) test.
Results: Psychological symptoms are present in 32.9% of the elderly population. The prevalence of depressive symptoms is 32.9% and the rate of obsessions is 26.6%. Somatization is present in 13.4% of cases, while interpersonal sensitivity is observed in 8.9% of cases. The paranoid symptom rate is 10.6%. While 6.9% of the participants have possible anger disorder symptoms, the rate of participants with anxiety symptoms is 6.6%. The rate of participants with probable phobic symptoms is 5.4%, and the rate of those with psychotic symptoms is 4.0%.
Conclusion: Psychiatric problems encountered in old age negatively affect the quality of life. Because the most common psychological symptoms were depression, obsession, and somatization, family physicians should conduct screenings for possible mental problems in elderly individuals registered with them, regardless of the reason.
Corresponding Author: Can Oner
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ASBSP Data Set
No full textThese data sets contain benchmark instances for airport shuttle scheduling problem which is introduced in the paper titled "The Airport Shuttle Bus Scheduling Problem".
The Airport Shuttle Bus Scheduling Problem, ASBSP, the incoming passengers are transferred from the airport to the city center and the outgoing passengers are transferred from the city center to the airport using a number of identical, capacitated vehicles. The flight schedule and the number of passengers that uses the transfer service from each flight are known. The passengers have their associated ready times and due dates, which are associated with their flight times and allowable waiting times. Revenue is earned from each transferred customer. On the other hand, there is a transfer cost associated with empty and loaded transfers of the vehicle. Since this is a private company that aims to maximize the profit, it is possible to reject some customer requests (if it will result in low utilization of the vehicle). In order to maximize the utilization of the vehicles, it is also allowed to split or group the transfer requests of passengers from different flights without overriding allowable waiting time limits. The problem is to determine the schedule of the vehicles and the assignment of the passengers to these vehicles in order to maximize the total profit.
You can find the details about parameters used in the instances in "explanation.txt" file.
If you find any errors, want to comment, have any suggestions or have any additional benchmark instances, you are welcomed to share and write an e-mail to [email protected] or [email protected] or [email protected]
A new EFMM-OneR hybrid model for diagnosing parkinson's disease
No full textParkinson's disease is a dangerous disease that attacks the nervous system and affects it negatively over time. Early diagnosis of this disease is necessary for identifying the most appropriate treatment for preventing the disease from worsening. It can be diagnosed by examining the symptoms of the patient. Recently, researchers have used voice disorders to diagnose Parkinson's disease by extracting attributes from audio recordings of affected people and using classification techniques to provide accurate diagnoses. In this paper, an enhanced fuzzy min-max neural network based on the OneR attribute evaluator (EFMM-OneR) is proposed as a hybrid model for diagnosing Parkinson's disease. The hybrid model consists of two stages: In the first stage, feature selection is used to identify and remove irrelevant, redundant, or noisy features from the provided dataset. In the second stage, the enhanced fuzzy min-max (EFMM) neural network is used for the classification process. The results demonstrated the ability of the EFMM-OneR model to improve the classification accuracy as compared to other classifiers from the literature
Hermite-Hadamard type inequalities for harmonically (?, m)-convex functions
No full textThe author introduces the concept of harmonically (?, m)-convex functions and establishes some Hermite-Hadamard type inequalities of theseclasses of functions
Adsorptive removal of bisphenol A from aqueous solutions using phosphonated levan
No full textIn this study, the potential use of phosphonated Halomonas Levan (PhHL) as a natural and cost effective adsorbent for Bisphenol A (BPA), was systematically investigated via the study of the adsorption equilibrium, kinetics, and reuse potential as well as the interpretation of adsorption mechanism. The effects of pH and temperature on the adsorption were also evaluated. The maximum amount of BPA adsorbed on the unit weight of PhHL was determined as 104.8 (-/+ 5.02) mg/g (at 298 K) and the maximum adsorption capacity was calculated as 126.6 mg/g by Sips model. FTIR and XPS studies were conducted to elucidate the adsorption mechanism. Based on the obtained results OH-pi and CH-pi interactions were found to be effective in the adsorption mechanism. The reuse ability was studied with three cycles of adsorption-desorption, and the results showed that the BPA adsorbed per gram of the PhHL decreased 28.6% after the third cycle. This study has shown that PhHL can be used as an effective adsorbent for the removal of BPA from aqueous solutions. The obtained results may be useful in the development of PhHL based adsorption systems for the removal of EDCs with similar chemical properties to BPA
Disease in Peyami Safa’s novels
No full textYüksek Lisans TeziSanatçı bir ailenin çocuğu olan Peyami Safa, Türk edebiyatının önemli kalemlerindendir. Yazar, romanları dışında fikir eserleri, gazeteciliği, köşe yazarlığı ve polemikleriyle de ünlüdür. Peyami Safa, Batılıların otodidakt dediği, kendi kendini yetiştirmiş nadir şahsiyetlerdendir. Kırk üç yıl gibi uzun denecek bir süre boyunca yazmıştır. Edebî değeri olmayan eserlerini Server Bedi takma adı ile yayımlamıştır. Yazarın eserlerinde tahliller önemli yer tutar. Zıt kavramları eserlerinde ustalıkla işlemiştir. Peyami Safa?nın hayatı, eserleri ve sanatı daha önce çok sayıda araştırmacı tarafından incelenmiş, fakat yazarın hayatında büyük yeri olan ve eserlerinde de kendisini yoğun olarak hissettiren hastalık konusu işlenmemiştir. Bu sebeple tarafımızdan araştırma konusu olarak seçilmiştir. Küçük yaşlardan itibaren hastalıklarla boğuşan Peyami Safa, başta Dokuzuncu Hariciye Koğuşu olmak üzere bütün eserlerinde bu durumu yansıtmaya çalışmıştır. Amacımız Peyami Safa?nın romanlarını hastalıklar bakımından inceleyerek hayatının ve bu arada hastalık ve hastalıklara dair fikirlerinin eserlerine nasıl yansıdığını göstermek ve okura bu yolla anlatmak istediklerini gün ışığına çıkarmaktır.AbstractPeyami Safa, is the one of the most important writers in Turkish Literature, has an artist family. He also has worked as a journalist and columnist. Also known as intellectual works and some polemics. Peyami Safa one of the rare people himself trained. He has written articles for 43 years. The author has written works of non-literary values Server Bedi name. Analysis holds an important place in the author's works. The author skillfully opposite concepts have been committed. The author's life, works and art and has been previously studied by many researchers but author of life a great location issues that disease has not been studied. Therefore, it is selected as the subject of research by our research group. The author's life is filled with diseases since his childhood. The author particularly in the Dokuzuncu Hariciye Koğuşu, including all the works have tried to reflect this situation. Our goal; the author of the novel is the study of diseases also, the author is reflected in the works show how the ideas of the diseases and expose what they want to tell the reader in this way
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