A study on load-deflection behavior of two-span continuous concrete beams reinforced with GFRP and steel bars

Unsal, Ismail,Tokgoz, Serkan,Cagatay, Ismail H.,Dundar, Cengiz Techno-Press 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.5

Continuous concrete beams are commonly used as structural members in the reinforced concrete constructions. The use of fiber reinforced polymer (FRP) bars provide attractive solutions for these structures particularly for gaining corrosion resistance. This paper presents experimental results of eight two-span continuous concrete beams; two of them reinforced with pure glass fiber reinforced polymer (GFRP) bars and six of them reinforced with combinations of GFRP and steel bars. The continuous beams were tested under monotonically applied loading condition. The experimental load-deflection behavior and failure mode of the continuous beams were examined. In addition, the continuous beams were analyzed with a numerical method to predict the load-deflection curves and to compare them with the experimental results. Results show that there is a good agreement between the experimental and the theoretical load-deflection curves of continuous beams reinforced with pure GFRP bars and combinations of GFRP and steel bars.

An Analysis of Assessment of Peacekeeping Operations

( Unsal Sigri ),( Ufuk Bas¸ar ) 한국국방연구원 2014 The Korean Journal of Defense Analysis Vol.26 No.3

This article proposes a model for assessment of peacekeeping operations. Peacekeeping operations began in 1948, under the authority of the United Nations in order to provide and sustain a peaceful environment throughout the world. International organizations such as the United Nations, the North Atlantic Treaty Organization and the African Union undertake peacekeeping operations in different geographical regions of the world. However, they lack some aspects of the assessment process. There were studies conducted previously in order to determine the principles of the assessment process of peacekeeping operations but none of them presented a comprehensive solution. Therefore, in this study, a clear, comprehensive and detailed assessment model was proposed, which may be applied in future peace operations and shed more light on the subject for future researches.

Turkcede Soru Durumlari

Gulhanim Unsal 한국외국어대학교 중동연구소 2010 중동연구 Vol.28 No.1

In this study, we tried to explain how to analyze the question cases by comparing the essential traditional Turkish grammar books. We dealed with the kinds, formations and meaning relation of the Turkish question sentences in the syntactic framework in Turkish education and teaching. We expressed the question sentences that are formed by intonation, question words and interrogative suffix -mi and using values of them comparatively. Moreover, we examined the question cases of interrogative suffix -mi according to the elements of sentences and its form of writing. The value of usage is explained with examples in order to clarify the subject. We evaluated the general view of modern linguistic studies to the question cases.

Characteristics of Children with Acute Carbon Monoxide Poisoning in Ankara: A Single Centre Experience

Rukiye Unsal Sac,Medine Ayşin Taşar,Yurda Şimşek,İlknur Bostancı,Yıldız Bilge Dallar 대한의학회 2015 Journal of Korean medical science Vol.30 No.12

The purpose of the study was to define characteristics of children with acute carbon monoxide poisoning. Eighty children hospitalized with acute carbon monoxide poisoning were recruited prospectively over a period of 12 months. Sociodemographic features, complaints and laboratory data were recorded. When the patient was discharged, necessary preventive measures to be taken were explained to parents. One month later, the parents were questioned during a control examination regarding the precautions that they took. The ages of the cases were between one month and 16 yr. Education levels were low in 86.2% of mothers and 52.6% of fathers. All families had low income and 48.8% did not have formal housing. The source of the acute carbon monoxide poisoning was stoves in 71.2% of cases and hot-water heaters in 28.8% of cases. Three or more people were poisoned at home in 85.1% of the cases. The most frequent symptoms of poisoning were headache and vertigo (58.8%). Median carboxyhemoglobin levels at admission to the hospital and discharge were measured as 19.5% and 1.1% (P < 0.001). When families were called for re-evaluation, it was determined that most of them had taken the necessary precautions after the poisoning incident (86.3%). This study determined that children with acute childhood carbon monoxide poisoning are usually from families with low socioeconomic and education levels. Education about prevention should be provided to all people who are at risk of carbon monoxide poisoning before a poisoning incident occurs.

Turkce ve Fransizcanin Sozdizimsel Acidan Incelenmesi

Gulhanim Unsal 한국외국어대학교 중동연구소 2010 중동연구 Vol.29 No.2

This study is about sentence structures of Turkish and French languages. They are in different language groups and these two languages presents the different grammatical rules and syntax characteristics. We speaked about the theory of N.Chomsky of generative grammar. We pointed out the syntagmatic structures and hierarchic bonds in sentences of these two languages. We explained the difference between these two languages making a comparison. Because Turkish language differs from French language at syntactic unit. In Turkish language, complement takes place before verb, takes inflectional suffix and builds possessive construction with genitive and possessive suffixs.

Efficacy and Safety of Intravitreal Dexamethasone Implants for Treatment of Refractory Diabetic Macular Edema

Erkan Unsal,Kadir Eltutar,Pınar Sultan,Sezin Ozdogan Erkul,Ozen Ayranci Osmanbasoglu 대한안과학회 2017 Korean Journal of Ophthalmology Vol.31 No.2

Purpose: To evaluate the safety and efficacy of intravitreal dexamethasone (IVD) implants in eyes with diabeticmacular edema that did not respond to previous treatment. Methods: We included 46 eyes of 46 patients in this retrospective study. Each month, we recorded patient visualacuity with logarithm of the minimum angle of resolution using the Early Treatment Diabetic RetinopathyStudy chart, central macular thickness measurements with optical coherence tomography, intraocular pressure(IOP), and posttreatment complication occurrence. Results: The mean follow-up time was 8.95 ± 1.33 months (range, 6 to 12). Best-corrected visual acuity improvedsignificantly in the first 4 months after IVD, but no statistically significant change was observed over the following2 months. Although a statistically significant decrease in central macular thickness was observed in thefirst 3 months, the change was not statistically significant in the following 3 months. There was a statisticallysignificant increase in IOP in the first 2 months, but no statistically significant change was observed in the followingmonths. IOP was controlled with medication in all patients with elevated IOP. Of the 26 phakic patients,two had cataracts requiring surgery. Conclusions: Cases of refractory diabetic macular edema that did not respond to previous treatment, such asanti-vascular endothelial growth factor injections and laser photocoagulation, exhibited improvements in visualacuity and decreases in retinal thickness after IVD implantation. Both functional and anatomical effects wereobserved in the first 3 months after injection. Repeat injections and frequent examination might be required forcontinued improvement. Side effects, such as cataracts and elevation of IOP, may require medical or surgicaltreatment.

A study on load-deflection behavior of two-span continuous concrete beams reinforced with GFRP and steel bars

Ismail Unsal,Serkan Tokgoz,Ismail H. Cagatay,Cengiz Dundar 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.5

Continuous concrete beams are commonly used as structural members in the reinforced concrete constructions. The use of fiber reinforced polymer (FRP) bars provide attractive solutions for these structures particularly for gaining corrosion resistance. This paper presents experimental results of eight two-span continuous concrete beams; two of them reinforced with pure glass fiber reinforced polymer (GFRP) bars and six of them reinforced with combinations of GFRP and steel bars. The continuous beams were tested under monotonically applied loading condition. The experimental load-deflection behavior and failure mode of the continuous beams were examined. In addition, the continuous beams were analyzed with a numerical method to predict the load-deflection curves and to compare them with the experimental results. Results show that there is a good agreement between the experimental and the theoretical load-deflection curves of continuous beams reinforced with pure GFRP bars and combinations of GFRP and steel bars.

The Relationship between Periodontal Status and Alkaline Phosphatase Levels in Gingival Crevicular Fluid in Men with Hypergonadotropic Hypogonadism

Berrin Unsal,Isil Saygun,Ozlem Daltaban,Belgin Bal,Erol Bolu 연세대학교의과대학 2008 Yonsei medical journal Vol.49 No.1

Purpose: The aim of this preliminary study was to determine the possible relationship between alkaline phosphatase (ALP) levels in the gingival crevicular fluid (GCF) and periodontal disease in men with hypergonadotropic hypogonadism (HH). Materials and Methods: A total of 41 patients were divided into four groups. 9 with HH and periodontitis (P/HH), 11 with HH and gingivitis (G/HH), 12 with systemically healthy and periodontally healthy (H/C) and 9 with systemically healthy and periodontitis (P/C). The clinical evaluation of patients was based on the following parameters; the plaque index (PI), gingival index (GI), probing depths (PD) and attachment level (AL). The levels of ALP in the GCF were measured by enzyme-linked immunosorbent assay (ELISA). Results: No significant difference could be detected in the mean clinical parameter data between the P/HH and P/C groups (p>0.05). The periodontitis patients in both groups (P/C and P/HH) had higher mean probing depths than the H/C and G/HH patients (p<0.001). The concentrations and total amounts of ALP in the GCF were significantly higher in both periodontitis groups compared to healthy and gingivitis groups (p<0.01). The serum ALP levels were significantly higher in the P/HH group when compared to the other groups (p<0.001). Conclusion: The findings of this study suggested that HH could be implicated as a contributing factor to the progress of periodontal disease.

Effect of Thermal Compression Treatment on the Surface Hardness, Vertical Density Propile and Thickness Swelling of Eucalyptus Wood Boards by Hot-pressing

Oner Unsal,Zeki Candan,Umit Buyuksari,Suleyman Korkut,Yoon Seong Chang,Hwan Myeong Yeo 한국목재공학회 2011 목재공학 Vol.39 No.2

Thermal treatment techniques are used for modifying wood and wood-based materials to improve dimensional stability and hygroscopicity. This study investigated the effects of press pressure and temperature on density, vertical density profile, thickness swelling and surface hardness of eucalyptus wood boards. The experimental wood boards were prepared from Turkish River Gum (Eucalyptus camaldulensis Dehn.). The surface hardness value increased with increasing press pressure in the treated groups. The application of a higher pressure at the same temperature level increased the amount of swelling of wood. It means that it is not needed for application of higher pressure to enhance the dimensional stability of wood. It is expected that it is possible to produce increased hardness, dimensional stability and durability by application of hot pressing treatment. This research showed that different press pressure and temperature values should be used to improve the performance properties of eucalyptus wood so that the end-use of the wood materials could be expanded.

ON WEAKLY 2-ABSORBING PRIMARY IDEALS OF COMMUTATIVE RINGS

Ayman Badawi,Unsal Tekir,Ece Yetkin 대한수학회 2015 대한수학회지 Vol.52 No.1

Let R be a commutative ring with 1 ≠ 0. In this paper, we introduce the concept of weakly 2-absorbing primary ideal which is a generalization of weakly 2-absorbing ideal. A proper ideal I of R is called a weakly 2-absorbing primary ideal of R if whenever a, b, c ∈ R and 0 ≠ abc ∈ I, then ab ∈ I or ac ∈ √I or bc ∈ √I. A number of results concerning weakly 2-absorbing primary ideals and examples of weakly 2-absorbing primary ideals are given.