Hidden Beauty of Women: Brassieres

Ercan, Emine The Costume Culture Association 2009 Fashion, industry and education Vol.12 No.2

The meaning of brassieres much more than a piece of underwear for women because breasts are considered the symbol of feminine sexuality, througout the history, women have used various intimate apparel or device to shape their body. In this article, have highlighted the relationships between fashion and technology, attractiveness, identity and, all of which are important components of aspects and evaluation of bra.

Measurement of Contrast Sensitivity in Patients with Behçet’s Disease without Ocular Involvement

Ercan Ozsoy 대한안과학회 2019 Korean Journal of Ophthalmology Vol.33 No.2

Purpose: To evaluate contrast sensitivity in patients with Behçet’s disease (BD) without ocular involvement. Methods: The study group was composed of 47 BD patients (20 to 50 years of age) who did not have ocularinvolvement. The control group was composed of 47 normal volunteers who were similar to the study group interms of age and gender. No participants in this study had any ocular or systemic pathologies except for BD. The contrast sensitivity measurements were performed using the Functional Acuity Contrast Test under photopicconditions, and the results were compared between the two groups. Results: The mean age of the BD patients and control subjects was 34.5 ± 9.7 and 33.2 ± 7.6 years, respectively. The mean disease duration of the BD patients was 5.5 ± 6.4 years. There was a statistically significantdecrease at five spatial frequencies (A, 1.5; B, 3; C, 6; D, 2; and E, 18 cycles per degree) in patients with BDcompared with control subjects (p < 0.001, p = 0.004, p = 0.002, p < 0.001, and p = 0.001, respectively). Conclusions: The contrast sensitivity of BD patients without ocular involvement was lower than that of the controlgroup. Further studies seem mandatory to confirm our results.

Analysis of Technical Specification-based Disputes in Construction Industry

Ercan Erdis,Sitki Alper Ozdemir 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.7

This article covers the role of the standard and dynamic technical specification system for building structures in avoiding disputes between the employer and contractor, which is a ever-lasting problem in Turkey. For this purpose, the study was started with examining approximately 100 specification files and 32 court records on these issues. Afterwards, a survey was conducted among 58construction firms associated with the “Turkish Contractors Union” to identify the causes of technical specification related disputes and developing suggestions for possible resolutions. The survey results showed that these disputes generally arise from project characteristics and are mostly human oriented. It was concluded that establishing an institute consisting of experts in technical specifications, creating a standard and dynamic specification system, having quality guidelines, making judicial arrangements to shorten the judicial process, and information dissemination on related subjects through academic programs and judicial documents are important.

Microstructure Properties and Microhardness of Rapidly Solidified Al64Cu20Fe12Si4 Quasicrystal Alloy

Ercan Karaköse,Mustafa Keskin 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.2

This paper presents differences in the microstructure and microhardness properties of conventional casting (ingot) and rapidly solidified Al64Cu20Fe12Si4 quasicrystal (QC) alloys. The phases present in the Al64Cu20Fe12Si4ingot alloy were determined to be icosahedral quasicrystalline (IQC) Ψ-Al65Cu20Fe15, cubic β-AlFe, tetragonal θ-Al2Cu, and monoclinic λ-A13Fe4 phases, whereas only IQC Ψ-Al65Cu20Fe15 and cubic β-AlFe phases were identified in the rapidly solidified alloy. The microhardness value of the melt spun alloy was measured to be approximately 790 kg/mm2. Microhardness increases with increasing solidification rates.

Microhardness and Morphologic Characteristics of Rapidly Solidified Al–12Si–8Ni–5Nd Alloy

Ercan Karaköse,Mustafa Keskin 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.3

Al–Si–Ni–Nd alloys with a nominal composition of Al–12 wt.% Si–8 wt.% Ni–5 wt.% Nd alloy are prepared by a conventional casting (ingot) and melt spinning technique at different cooling rates (v). The effects of the rapid solidification rate on the microstructures and microhardness performances of the specimen alloys are investigated in detail. The results obtained by the XRD, SEM and DSC show that the ingot and melt spun alloys have a multiphase structure. When v is 5 m/s, the alloy consists of four phases namely α-Al,intermetallic Al3Ni, Al11Nd3, and fcc Si. The melt-spun ribbons are completely composed of α-Al and eutectic Si phases, and primary silicon is not observed when v increases to 20 m/s, 25 m/s, 30 m/s and 35 m/s. The XRD analysis indicated that the solubility of Si in the α-Al matrix increases greatly with the rapid solidification. The change in microhardness is discussed based on the microstructural observations. The microhardness values of the melt spun ribbons are about three times higher than those of ingot counterparts.

The effect of different earthquake ground motion levels on the performance of steel structures in settlements with different seismic hazards

Ercan Işık,İbrahim Baran Karaşin,Abdulhalim Karaşin 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.84 No.1

The updated Turkish Building Earthquake Code has been significantly renovated and expanded compared to previous seismic design codes. The use of earthquake ground motion levels with different probabilities of exceedance is one of the major advances in structural mechanics with the current code. This study aims to investigate the earthquake performance of steel structure in settlements with different seismic hazards for various earthquake ground motion levels. It is focused on earthquake and structural parameters for four different ground motion levels with different probabilities of exceedance calculated according to the location of the structure by the updated Turkish Hazard Map. For this purpose, each of the seven different geographical regions of Turkey which has the same seismic zone in the previous earthquake hazard map has been considered. Earthquake parameters, horizontal design elastic spectra obtained and comparisons were made for all different ground motion levels for the seven different locations, respectively. Structural analyzes for a sample steel structure were carried out using pushover analysis by using the obtained design spectra. It has been determined that the different ground motion levels significantly affect the expected target displacements of the structure for performance criteria. It is noted that the different locations of the same earthquake zone in the previous code with the same earthquake-building parameters show significant variations due to the micro zoning properties of the updated seismic design code. In addition, the main innovations of the updated code were discussed.

ON DEFERRED CESÀRO MEAN IN PARANORMED SPACES

Ercan, Sinan The Kangwon-Kyungki Mathematical Society 2021 한국수학논문집 Vol.29 No.1

The aim of the present study is to introduce the concepts of deferred statistical convergence, deferred statistical Cauchy sequence and deferred Cesàro summability in paranormed spaces. We investigate some properties of these concepts and some inclusion relations with examples.

Observation of behavior of the Ahlat Gravestones (TURKEY) at seismic risk and their recognition by QR code

Ercan Işık,Barış Antep,Aydın Büyüksaraç,Mehmet Fatih Işık 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.72 No.5

Protection of cultural heritage and carrying it to the future are at the top of the significant topics of research and implementation in engineering in the 21st century. There are several historical structures in the district of Ahlat located in the east of Turkey on the Lake Van Basin that has harbored many civilizations. Some of such works are the gravestones that are found in the Ahlat Seljuk Cemetery, which is the oldest and largest cemetery in the district. This study firstly provides information about the Ahlat Seljuk Cemetery and the gravestones found in it. Observation-based structural analyses were carried out on these gravestones that are found in this area that are known to have belonged to different civilizations based on their physical and constructional characteristics. These stones were built out of Ahlat stone as single pieces. Information is provided on the damages that have occurred on the gravestones in time and their causes. In general, losses of mass, abrasions, separations, collapses and calcifications due to natural conditions, as well as vegetative formations, were observed in the gravestones. To provide an example of other gravestones within the context of the study, the gravestone that is known to belong to the person named Nureddin Ebu Hasan was selected. As a result of the modeling that was carried out for this gravestone by using the finite elements method, modal analyses were carried out. With these analyses, for the gravestone, period, effective mass participation rates and stress values were calculated. The stress values that were obtained in this study were compared to the material safety stress values that were obtained in previous studies. Additionally, QR code application was created for the gravestone that was selected as an example in the study, and information on this gravestone was transferred to an electronic environment. The QR code application includes different language options, visuals of the gravestone and information on the gravestone. The QR application was also supported with a video of the cemetery where the gravestone is located. With this application, access to information about gravestones will be possible by using tablets and smartphones. With a QR code to be created for each gravestone, these gravestones will obtain identity cards.

Measurement of Contrast Sensitivity in Patients with Behçet’s Disease without Ocular Involvement

Ercan Ozsoy,Cem Cankaya,Emrah Ozturk,Abuzer Gunduz,Pamuk Betul Ulucan 대한안과학회 2019 Korean Journal of Ophthalmology Vol.33 No.2

Purpose: To evaluate contrast sensitivity in patients with Behçet’s disease (BD) without ocular involvement. Methods: The study group was composed of 47 BD patients (20 to 50 years of age) who did not have ocular involvement. The control group was composed of 47 normal volunteers who were similar to the study group in terms of age and gender. No participants in this study had any ocular or systemic pathologies except for BD. The contrast sensitivity measurements were performed using the Functional Acuity Contrast Test under photopic conditions, and the results were compared between the two groups. Results: The mean age of the BD patients and control subjects was 34.5 ± 9.7 and 33.2 ± 7.6 years, respectively. The mean disease duration of the BD patients was 5.5 ± 6.4 years. There was a statistically significant decrease at five spatial frequencies (A, 1.5; B, 3; C, 6; D, 2; and E, 18 cycles per degree) in patients with BD compared with control subjects (p < 0.001, p = 0.004, p = 0.002, p < 0.001, and p = 0.001, respectively). Conclusions: The contrast sensitivity of BD patients without ocular involvement was lower than that of the control group. Further studies seem mandatory to confirm our results.

Association of Early Favipiravir Use with Reduced COVID-19 Fatality among Hospitalized Patients

Ercan Karatas,Lacin Aksoy,Ersin Ozaslan 대한감염학회 2021 Infection and Chemotherapy Vol.53 No.2

Background: The antiviral agent favipiravir is an RNA-dependent RNA polymerase (RdRp) inhibitor. Materials and Methods: We examined patients with a clinical, laboratory, and radiological diagnosis of severe coronavirus disease 2019 (COVID-19) pneumonia. We investigated the effect of administering enteral favipiravir at a 2 × 1,600 mg loading dose and 2 × 600 mg maintenance dose for 5 days in addition to the standard COVID-19 treatment. Results: In total, 180 patients, who were hospitalized at the Istanbul Tuzla State Hospital and received favipiravir treatment between March 20, 2020 and May 30, 2020, were examined. Of these, 47 patients died. Thirty-three of the patients who died were aged over 65 years (70%), indicating that fatality was higher in elderly patients. Most of those who died had at least one comorbidity. Of the 101 patients who initiated favipiravir within ≤3 days of hospitalization, 17 died (17%). Of the 79 patients who initiated favipiravir after >3 days of hospitalization, 30 died (38%) (P = 0.002). Conclusion: We found that initiation of favipiravir within the first 72 h after the onset of disease symptoms reduced fatality in patients with COVID-19.