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      • KCI등재

        Antioxidant Activity, Phenolic Content, and Peroxide Value of Essential Oil and Extracts of Some Medicinal and Aromatic Plants Used as Condiments and Herbal Teas in Turkey

        Ozcan,,Mehmet,Musa,Erel,,Ozcan,Herken,,Emine,Etoz The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.1

        The antioxidant activity, total peroxide values, and total phenol contents of several medicinal and aromatic plant essential oil and extracts from Turkey were examined. Total phenolic contents were determined using a spectrophotometric technique and calculated as gallic acid equivalents. Total antioxidant activity of essential oil and extracts varied from 0.6853 to 1.3113 and 0.3189 to $0.6119\;{\mu}mol$ of Trolox equivalents/g, respectively. The total phenolic content of essential oil ranged from 0.0871 to 0.5919 mg of gallic acid/g dry weight. However, the total phenolic contents of extracts were found to be higher compared with those of essential oils. The amount of total peroxide values of oils varied from 7.31 (pickling herb) to 58.23 (bitter fennel flower) ${\mu}mol$ of $H_2O_2/g$. As a result, it is shown that medicinal plant derivatives such as extract and essential oils can be useful as a potential source of total phenol, peroxide, and antioxidant capacity for protection of processed foods.

      • KCI등재SCOPUS

        A Simple Model for the Calculation of Entrainment in Flotation

        Ozcan,Y.,Gulsoy 한국화학공학회 2005 Korean Journal of Chemical Engineering Vol.22 No.4

        Theoretical and experimental studies have been performed to analyze the entrainment of both hydrophilic and hydrophobic particles in flotation. A new model is proposed for the entrainment based on the water recovery trend. Two sets of timed flotation experiments were carried out to validate the model. These experiments were realized with quartz and pyrite as the only mineral in the pulp and with various frother concentrations and pulp densities. The chemical conditions of the pulp were adjusted to float pyrite as hydrophobic and to depress quartz as hydrophilic mineral. The solids recovery for each size fraction and water recovery was measured in these experiments. The proposed empirical model equation was checked against experimental observations. It was observed that the model equation well represented the entrainment-water relationship. Since hydrophilic mineral recovery mainly depends on the entrainment, the data obtained from quartz only tests were first fitted to the entrainment equation. The fit for quartz data was found to be satisfactory. This shows that the proposed model could be used to define the behavior of hydrophilic particles in a batch flotation test. The same model was applied for pyrite only tests and contribution of entrainment to hydrophobic mineral recovery was calculated. The results provided accurate interpretation of hydrophobic mineral entrainment, which is difficult to directly measure.

      • KCI등재

        Validity and Reliability of Sun Protection Behavior Scale among Turkish Adolescent Population

        Ozcan,Aygun,Ayse,Ergun 한국간호과학회 2015 Asian Nursing Research Vol.9 No.3

        Purpose: The aim of this research was to adapt the Sun Protection Behavior Scale (SPBS) to Turkish and to perform validity and reliability analyses. Methods: The scale was administered to a total of 900 adolescents, the retest to 91 adolescents. The construct validity of the scale was evaluated using exploratory (EFA) and confirmatory factor analysis (CFA). The EFA and CFA were applied to sample groups of 449 and 451 people, respectively. Results: The Cronbach alpha coefficients for the Turkish form of the SPBS (a = .74) and its sunscreen (a = .88) and hat use (a = .70) subscales were found to be .70 while the sun avoidance subscale was calculated to be .67. The item-total score correlation between the scale and its subscales was .26 and the test-retest correlations were found to be .51. The CFA results verified the 8-item, 3-factor Turkish version of the SPBS. The confirmatory factor loadings for the scale were .45e.80 for sun avoidance, .72 e.93 for sunscreen use, and .66e.83 for hat use. In particular, SPBS and sunscreen use (p < .001) exhibited significantly high mean scores among girls and economically better backgrounds (p= .007, p < .001, respectively). In addition, SPBS (p = .004) and hat use (p < .001) revealed that the mean scores were significantly high in younger adolescents. Conclusions: The SPBS was found to be valid and reliable and its psychometric characteristics acceptable. The scale can be used to measure the behavior of Turkish adolescent populations with respect to sun protection.

      • SCOPUSKCI등재

        Role of cone-beam computed tomography in the evaluation of a paradental cyst related to the fusion of a wisdom tooth with a paramolar: A rare case report

        Ozcan,,Gozde,Sekerci,,Ahmet,Ercan,Soylu,,Emrah,Nazlim,,Sinan,Amuk,,Mehmet,Avci,,Fatma Korean Academy of Oral and Maxillofacial Radiology 2016 Imaging Science in Dentistry Vol.46 No.1

        Fusion is an abnormality of tooth development defined as the union of two developing dental germs, resulting in a single large dental structure. This irregular tooth morphology is associated with a high predisposition to dental caries and periodontal diseases. As a result of recurring inflammatory periodontal processes, disorders such as periodontal pocket, pericoronitis, and paradental cysts may develop. A rare mandibular anatomic variation is the retromolar canal, which is very significant for surgical procedures. The fusion of a paramolar and mandibular third molar associated with a paradental cyst co-occurring with the presence of a retromolar canal is rare, and the aim of the present study is to describe the evaluation of this anatomical configuration using cone-beam computed tomography.


        Improving Empathy in Nursing Students

        Ozcan,,Celale,Tangul,Oksuz,,Emine,Oflaz,,Fahriye 한국간호과학회 2018 Journal of Korean Academy of Nursing Vol.48 No.5

        Purpose: This study aimed to examine changes of empathy levels of nursing student in two different curricula structures, one called “traditional” and the other called “integrated” curricula. The study was a longitudinal design to follow a cohort of nursing students to examine the magnitude of changes in empathy in their education years. Methods: The study was conducted in a public school of nursing giving a baccalaureate degree, which had a fundamental change in their curricula. In all, 81 students from the traditional curricula and 66 students from the integrated curricula completed the study, and data from a total of 147 students were analyzed between 2003 and 2008. The Empathic Communication Skills Scale and the Empathic Tendency Scale were given to the students in the beginning of their freshman year and at the end of the fourth year just before graduation. Results: Although both of the curricula were seemed effective at improving empathic skills of students, especially the scores of students who completed the integrated curricula were higher than the scores of the other group attending the traditional curricula (p<.05). However, the empathic tendency scores of students in both curricula decreased at the end of fourth year. Conclusion: Although undergraduate nursing curricula either traditional or integrated improved empathic skills, it seemed that integrated curricula were more effective than traditional curricula in increasing empathic skills. The more hours and more experiential methods contributed to improved empathy. The decrease in empathic tendency requires further attention of educators and nurse managers.

      • KCI등재SCOPUS

        Effect of Bentonite, Fly Ash and Silica Fume Cement Injections on Uniaxial Compressive Strength of Granular Bases

        Ozcan,Tan,Gokhan,Gungormus,A.,Sahin,Zaimoglu 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.6

        Injection is one of the methods to improve the engineering properties of bases. Various additions as well as cement are used forpreparations of injection blends in order to lower costs and reach better results. For this purpose in the preparation of the injectionblends, Bentonite (B), Fly Ash (FA) and Silica Fume (SF) were used at the ratios of 0-0.5-1-3%, 10-20-30-40% and 0-5-10-20%,respectively. Taguchi method was applied for the experiment and L16 Orthogonal Array (OA) with three factors and four levels werechosen. Granular bases having 0.70 relative density was settled into a cylindrical mold to which injection blends were injected. Effectof B, FA and SF over the uniaxial compressive strength of the samples of 7, 14, 28 days that have been prepared in this manner wasinvestigated. In results of the experiments it was observed that the most effective parameter over the uniaxial compressive strength of7, 14 and 28 days was silica fume.


        Stiffness modeling of RC columns reinforced with plain rebars

        Ozcan,,Okan Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.50 No.2

        Inaccurate predictions of effective stiffness for reinforced concrete (RC) columns having plain (undeformed) longitudinal rebars may lead to unsafe performance assessment and strengthening of existing deficient frames. Currently utilized effective stiffness models cover RC columns reinforced with deformed longitudinal rebars. A database of 47 RC columns (33 columns had continuous rebars and the remaining had spliced reinforcement) that were longitudinally reinforced with plain rebars was compiled from literature. The existing effective stiffness equations were found to overestimate the effective stiffness of columns with plain rebars for all levels of axial loads. A new approach that considers the contributions of flexure, shear and bond slip to column deflections prior to yielding was proposed. The new effective stiffness formulations were simplified without loss of generality for columns with and without lap-spliced plain rebars. In addition, the existing stiffness models for the columns with deformed rebars were improved while taking poor bond characteristics of plain rebars into account.

      • KCI등재SCOPUS

        The effect of a diode laser and traditional irrigants on the bond strength of self-adhesive cement

        Erhan,Ozcan,Cihan,Yildirim,Serdar,Polat,Ali,Riza,Tuncdemir 대한치과보철학회 2013 The Journal of Advanced Prosthodontics Vol.5 No.4

        PURPOSE The purpose of this study was to compare the effect of a diode laser and traditional irrigants on the bond strength of self-adhesive cement. MATERIALS AND METHODS Fifty-five incisors extracted due to periodontal problems were used. All teeth were instrumented using a set of rotary root canal instruments. The post spaces were enlarged for a No.14 (diameter, 1.4 mm) Snowlight (Abrasive technology, OH, USA) glass fiber reinforced composite post with matching drill. The teeth were randomly divided into 5 experimental groups of 11 teeth each. The post spaces were treated with the followings: Group 1: 5 mL 0.9% physiological saline; Group 2: 5 mL 5.25% sodium hypochlorite; Group 3: 5 mL 17% ethylene diamine tetra acetic acid (EDTA), Group 4: 37% orthophosphoric acid and Group 5: Photodynamic diode laser irradiation for 1 minute after application of light-active dye solution. Snowlight posts were luted with self-adhesive resin cement. Each root was sectioned perpendicular to its long axis to create 1 mm thick specimens. The push-out bond strength test method was used to measure bond strength. One tooth from each group was processed for scanning electron microscopic analysis. RESULTS Bond strength values were as follow: Group 1 = 4.15 MPa; Group 2 = 3.00 MPa; Group 3 = 4.45 MPa; Group 4 = 6.96 MPa; and Group 5 = 8.93 MPa. These values were analysed using one-way ANOVA and Tukey honestly significant difference test (P<.05). Significantly higher bond strength values were obtained with the diode laser and orthophosphoric acid (P<.05). There were no differences found between the other groups (P>.05). CONCLUSION Orthophosphoric acid and EDTA were more effective methods for removing the smear layer than the diode laser. However, the diode laser and orthophosphoric acid were more effective at the cement dentin interface than the EDTA, Therefore, modifying the smear layer may be more effective when a self-adhesive system is used.

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