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      • KCI등재

        Effects of Cyclotorsion Orientation and Magnitude in Eyes with Compound Myopic Astigmatism on the Compensation Capacity of WaveLight EX500 Photorefractive Keratectomy

        Kemal,Ozulken,Cagri,Ilhan 대한안과학회 2019 Korean Journal of Ophthalmology Vol.33 No.5

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        Purpose: To investigate the clinical effects of different orientation and magnitude of cyclotorsion on the compensationcapacity of the WaveLight EX500 photorefractive keratectomy (PRK) platform. Methods: This retrospective study comprised 400 eyes of 200 patients who underwent bilateral simultaneousPRK due to compound myopic astigmatism. The subjects were separated according to the orientation of cyclotorsioninto incyclotorsion and excyclotorsion groups, and by the magnitude of cyclotorsion into group 1 (0.50to 2.50 degrees), group 2 (3.00 to 5.00 degrees), group 3 (5.50 to 7.50 degrees), and group 4 (8.00 to 9.50 degrees). Results: The mean magnitude of cyclotorsion was 3.50 ± 2.4 degrees (0.50 to 9.50 degrees) in the incyclotorsiongroup and 3.32 ± 2.3 degrees (0.50 to 9.50 degrees) in the excyclotorsion group (p = 0.617). The postoperativerefractive outcomes of the incyclotorsion and excyclotorsion groups were similar (p > 0.05 for all). Thepostoperative mean cylindrical refractive error was -0.32 ± 0.3 diopters (D, -1.25 to 0.00 D) in group 1, -0.47 ± 0.2D (-2.00 to 0.00 D) in group 2, -0.62 ± 0.2 D (-1.00 to -0.25 D) in group 3, and -0.91 ± 0.2 D (-1.50 to -0.50 D) ingroup 4 (p < 0.001). Preoperative cylindrical refractive error was positively correlated with magnitude of cyclotorsion(r = 0.125 and p = 0.013), which was also positively correlated with postoperative cylindrical refractiveerror (r = 0.600 and p < 0.001). Conclusions: Incyclotorsion and excyclotorsion can be equally compensable in the WaveLight EX500 PRKplatform for compound myopic astigmatism. A value of ≤2.50 degrees cyclotorsion magnitude was observedto be more compensable than higher degrees of cyclotorsion magnitude. Preoperative high astigmatism wasassociated with high cyclotorsion magnitude, which was also associated with a high degree of postoperativeastigmatism.

      • KCI등재

        Assessment of endodontically treated teeth by using different radiographic methods: an ex vivo comparison between CBCT and other radiographic techniques

        Kemal,Özgür,Demiralp,Kivanç,Kamburŏglu,Kahraman,Güngör,Selcen,Yüksel,Gokcen,Demiralp,Özlem,Üçok 대한구강악안면방사선학회 2012 Imaging Science in Dentistry Vol.42 No.3

        Purpose: To compare different radiographic methods for assessing endodontically treated teeth. Materials and Methods: Root canal treatments were applied in 120 extracted mandibular teeth, which were divided into four groups: (1) ideal root canal treatment (60 teeth), (2) insufficient lateral condensation (20 teeth), (3) root canals filled short of the apex (20 teeth), (4) overfilled root canal treatment (20 teeth). The teeth were imaged using intraoral film, panoramic film, digital intraoral systems (CCD and PSP), CCD obtained with portable X-ray source, digital panoramic, and CBCT images obtained at 0.3 mm3 and 0.2 mm3 voxel size. Images were evaluated separately by three observers, twice. Kappa coefficients were calculated. The percentage of correct readings obtained from each modality was calculated and compared using a t-test (p⁄0.05). Results: The intra-observer kappa for each observer ranged between 0.327 and 0.849. The inter-observer kappa for each observer for both readings ranged between 0.312 and 0.749. For the ideal root canal treatment group, CBCT with 0.2 mm3 voxel images revealed the best results. For insufficient lateral condensation, the best readings were found with periapical film followed by CCD and PSP. The assessment of teeth with root canals filled short of the apex showed the highest percentage of correct readings by CBCT and CCD. For the overfilled canal treatment group, PSP images and conventional periapical film radiographs had the best scores. Conclusion: CBCT was found to be successful in the assessment of teeth with ideal root canal treatment and teeth with canals filled short of the apex.

      • KCI등재후보SCOPUS

        Effect of Hen Weight on Egg Production and Some Egg Quality Characteristics in Pheasants (Phasianus colchicus)

        Kemal,Kırık?ı,Orhan,?tin,Mustafa,Garip 아세아·태평양축산학회 2004 Animal Bioscience Vol.17 No.5

        A study was conducted to determine the effect of live weight of pheasants on egg production and egg quality characteristics. A total of 48 ring-necked pheasants were divided into control, heavy, middle and light BW groups. Live weights of the control were 1,187 g, 1,352.92 g for heavy group, 1,247.92 g for middle group and 1,003.33 g for light group. Egg production of groups were found as 47.32, 42.82, 45.79 and 46.51% respectively, in 10 weeks of period. There were no statistical differences on egg production among the groups. The effect of live weight on egg weight, shape index, specific gravity, shell weight, shell thickness, Haugh Unit, yolk weight and albumen weight were found statistically significant (p<0.05). The effect of live weight on albumen index, membrane weight and membrane thickness were found not important (p>0.05). On the other hand, other important factors to be effective on the egg quality of pheasants should be investigated. As a result of this study, live weight of pheasant hens is not an important factor to obtain high egg production in pheasants. But, body conformation of breeding materials should be in good conditions.

      • KCI등재SCOPUS

        Are patients and physicians willing to accept less-radical procedures for cervical cancer?

        Kemal,Gungorduk,Roman,Kocian,Derman,Basaran,Taner,Turan,Aykut,Ozdemir,David,Cibula 대한부인종양학회 2018 Journal of Gynecologic Oncology Vol.29 No.4

        OBJECTIVE: To evaluate the opinions of women who underwent surgery for cervical cancer (CC) and physicians who treat CC about the acceptability of increased oncological risk after less-radical surgery. METHODS: One hundred eighty-two women who underwent surgery for CC and 101 physicians participated in a structured survey in 3 tertiary cancer centers in Czech Republic and Turkey. Patients and physicians were asked whether they would accept any additional oncological risks, which would be attributable to the omission of parametrectomy (radical hysterectomy/trachelectomy vs. simple hysterectomy/trachelectomy) or pelvic lymph node dissection (systematic resection vs. sentinel lymph node sampling). RESULTS: Although 52.2% of patients reported morbidity related to their previous treatment, the majority of patients would not accept less-radical surgical treatment if it was associated with any increased risk of recurrence (50%-55%, no risk; 17%-24%, risk <0.1%). Physicians tended to accept a significantly higher risk than patients in the Czech Republic, but not in Turkey. Patients with higher education levels, more advanced-stage of disease, or adverse events related to previous cancer treatment, and patients who received adjuvant therapy were significantly more likely to accept an increased oncological risk. CONCLUSION: Patients, even if they suffered from morbidity related to previous CC treatment, do not want to choose between oncological safety and a better quality of life. Physicians tend to accept the higher oncological risk associated with less-radical surgical procedures, but attitudes differ regionally. Professionals should be aware of this tendency when counselling the patients before less-radical surgery.

      • KCI등재SSCI

        Motivations for choosing teaching as a career: a perspective of pre-service teachers from a Turkish context

        Kemal,Yüce,Esin,Y.,S¸ahin,Omer,Koc¸er,Fatih,Kana 서울대학교 교육연구소 2013 Asia Pacific Education Review Vol.14 No.3

        As teaching is a nation-building profession, the career motivations of pre-service teachers are worth exploring. This study examines the career motivations of 283 Turkish pre-service teachers who have chosen teaching as a career. Accordingly, they were asked questions about deciding to teach, career perceptions, and major expectations. A profile of the participants was then developed by analyzing their responses in quantitative and qualitative ways as being descriptive, statistical, and inductive steps. It is seen that extrinsic, altruistic, and intrinsic motivations all play a role when individuals choose teaching as a career. In addition, although altruistic motives are very dominant for females, mercenary-based extrinsic motives are dominant for males. Associatively, teaching is further desired as a first profession by females. In light of the findings, we give suggestions for teacher training institutions and policy makers.

      • KCI등재SCOPUS

        Synthesis-chracteristics and sintering behavior of PZT-powder

        Kemal,Köseo,lu 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.1

        In the Pb(Zr0,525Ti0,475)O3 system, two powders were produced by chemical co-precipitation and mechanical mixing of Pb(NO3)2, Zr(OC3H7)4 and Ti(OC3H7)4. The powders were characterized with regard to their specific surface area, particle size distribution, phases present and the pore size distribution of the pressed powder tablets. The co-precipitated powder was sintered already at 750 °C to 99% of its theoretical density. The mechanically-mixed powders reached only 62.5% of the theoretical density at 900 °C sintering temperature, although they had a higher specific surface area and finer particle size than the co-precipitated powder. The better sintering behavior of the co-precipitated powder can be explained by a narrow pore size distribution and small pore size in its pressed powder tablets. This is further proof that a determination of the pore size distribution of pressed powder tablets gives reliable indications about the sintering behavior. In the Pb(Zr0,525Ti0,475)O3 system, two powders were produced by chemical co-precipitation and mechanical mixing of Pb(NO3)2, Zr(OC3H7)4 and Ti(OC3H7)4. The powders were characterized with regard to their specific surface area, particle size distribution, phases present and the pore size distribution of the pressed powder tablets. The co-precipitated powder was sintered already at 750 °C to 99% of its theoretical density. The mechanically-mixed powders reached only 62.5% of the theoretical density at 900 °C sintering temperature, although they had a higher specific surface area and finer particle size than the co-precipitated powder. The better sintering behavior of the co-precipitated powder can be explained by a narrow pore size distribution and small pore size in its pressed powder tablets. This is further proof that a determination of the pore size distribution of pressed powder tablets gives reliable indications about the sintering behavior.

      • KCI등재

        Mass Spectrometry in the Determination of Glycosylation Site and N-Glycan Structures of Human Placental Alkaline Phosphatase

        ( Kemal Solakyildirim ), ( Lingyun Li ), ( Robert J. Linhardt ) 한국질량분석학회 2018 Mass spectrometry letters Vol.9 No.3

        Alkaline phosphatase (AP) is a membrane-bound glycoprotein that is widely distributed in the plasma membrane of cells of various organs and also found in many organisms from bacteria to humans. The complete amino acid sequence and three-dimensional structure of human placental alkaline phosphatase have been reported. Based on the literature data, AP consists of two presumptive glycosylation sites, at Asn-144 and Asn-271. However, it only contains a single occupied N-linked glycosylation site and no occupied O-linked glycosylation sites. Hydrophilic interaction chromatography (HILIC) has been primarily employed for the characterization of the glycan structures derived from glycoproteins. N-glycan structures from human placental alkaline phosphatase (PLAP) were investigated using HILIC-Orbitrap MS, and subsequent data processing and glycan assignment software. 16 structures including 10 sialylated N-glycans were identified from PLAP.

      • KCI등재

        CARDAN POSITIONS IN THE LORENTZIAN PLANE

        ( Kemal Eren ), ( Soley Ersoy ) 호남수학회 2018 호남수학학술지 Vol.40 No.1

        In this paper, we study the instantaneous geometric properties of motion of rigid bodies in the Lorentzian plane. For this purpose we define Lorentzian form of Bottemas instantaneous invariants. In these regards, we obtain the necessary and sufficient condition of a Lorentzian plane to be at Cardan position with re-spect to these invariants.

      • Elevated Serum Neutrophil to Lymphocyte and Platelet to Lymphocyte Ratios Could be Useful in Lung Cancer Diagnosis

        Kemal,,Yasemin,Yucel,,Idris,Ekiz,,Kubilay,Demirag,,Guzin,Yilmaz,,Bahiddin,Teker,,Fatih,Ozdemir,,Meltem Asian Pacific Organization for Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.6

        Background: Lung cancer (LC) is still the primary cause of cancer deaths worldwide, and late diagnosis is a major obstacle to improving lung cancer outcomes. Recently, elevated preoperative or pretreatment neutrophil to lymphocyte ratio (NLR), platelet to lymphocyte ratio (PLR) and mean platelet volume (MPV) detected in peripheral blood were identified as independent prognostic factors associated with poor survival with various cancers, including colon cancer, esophageal cancer, gastric cancer and breast cancer. Objective: The aim of this study was to examine whether MPV, NLR and PLR could be useful inflammatory markers to differentiate lung cancer patients from healthy controls. An investigation was also made of the relationship between these markers and other prognostic factors and histopathological subgroups. Materials and Methods: Retrospectively eighty-one lung cancer patients and 81 age-sexes matched healthy subjects included into the study. Patients with hypertension, hematological and renal disease, heart failure, chronic infection, hepatic disorder and other cancer were excluded from the study. The preoperative or pretreatment blood count data was obtained from the recorded computerized database. Results: NLR and PLR values were significantly higher in the LC patients compared to the healthy subjects.( NLR: 4.42 vs 2.45 p=0.001, PLR: 245.1 vs 148.2 p=0.002) MPV values were similar in both groups (7.7 vs 7.8). No statistically significant relationship was determined between these markers (MPV, NLR and PLR) and histopathological subgroups and TNM stages. Conclusions: NLR and PLR can be useful biomarkers in LC patients before treatment. Larger prospective studies are required to confirm these findings.

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