Slider-Bearing Design with Micro-Machined Wavy-Cavity: Parametric Characterization of Thermohydrodynamic-Operation-Scheme

Ozalp B. Turker,Ozalp A. Alper The Korean Society of Mechanical Engineers 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.10

Slider bearings are widely applied in mechanical systems, where the design needs cover increased load capacity, lowered friction and power consumption and creative designs. This work is governed to perform a parametric characterization, by generating a novel structure on the upper slider surface, which can formally be expressed in micro-machined wavy-form, where the individual and combined influences of various structural design parameters and boundary conditions, on the performance records, are also evaluated. Computations put forward that the contribution of the wave amplitude on power loss values is highly dependent on the level of inlet pressure; higher amplitudes are determined to increase power loss in the lowest inlet pressure case of 1.01, whereas the contrary outcome is determined in the higher inlet pressure cases of 3.01 & 5.01. Designing the slider bearing system, based on optimal load capacity, produced the optimum wave number ranges as 10-45, 7-11 and 5-8 for the pad inclinations of $5^{\circ},\;4^{\circ}$ and $3^{\circ}$ respectively.

Slider-Bearing Design with Micro-Machined Wavy-Cavity

B. Turker Ozalp,A. Alper Ozalp 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.10

Slider bearings are widely applied in mechanical systems, where the design needs cover increased load capacity, lowered friction and power consumption and creative designs. This work is governed to perform a parametric characterization, by generating a novel structure on the upper slider surface, which can formally be expressed in micro-machined wavy-form, where the individual and combined influences of various structural design parameters and boundary conditions, on the performance records, are also evaluated. Computations put forward that the contribution of the wave amplitude on power loss values is highly dependent on the level of inlet pressure ; higher amplitudes are determined to increase power loss in the lowest inlet pressure case of 1.01, whereas the contrary outcome is determined in the higher inlet pressure cases of 3.01 & 5.01. Designing the slider bearing system, based on optimal load capacity, produced the optimum wave number ranges as 10-45, 7-11 and 5-8 for the pad inclinations of 5°, 4° and 3° respectively.

Manic Symptoms Due to Methylphenidate Use in an Adolescent with Traumatic Brain Injury

Ozalp Ekinci,Meltem Çobanoğullari Direk,Nuran Ekinci,Cetin Okuyaz 대한정신약물학회 2016 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.14 No.3

Almost one-fifth of children who sustain a traumatic brain injury (TBI) are under the risk of attention problems after injury. The efficacy and tolerability of methylphenidate (MPH) in children with a history of TBI have not been completely identified. In this case report, MPH-induced manic symptoms in an adolescent with TBI will be summarized. A male patient aged 17 years was admitted with the complaints of attention difficulties on schoolwork and forgetfullness which became evident after TBI. Long-acting MPH was administered with the dose of 18 mg/day for attention problems. After one week, patient presented with the complaints of talking to himself, delusional thoughts, irritability and sleeplessness. This case highlights the fact that therapeutic dose of MPH may cause mania-like symptoms in children with TBI. Close monitarization and slow dose titration are crucial when considering MPH in children with TBI.

Multicenter Analysis of Gestational Trophoblastic Neoplasia in Turkey

Ozalp, Sabit Sinan,Telli, Elcin,Oge, Tufan,Tulunay, Gokhan,Boran, Nurettin,Turan, Taner,Yenen, Mufit,Kurdoglu, Zehra,Ozler, Ali,Yuce, Kunter,Ulker, Volkan,Arvas, Macit,Demirkiran, Fuat,Bese, Tugan,Tok Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.8

Background: To evaluate the incidence, diagnosis and management of GTN among 28 centers in Turkey. Materials and Methods: A retrospective study was designed to include GTN patients attending 28 centers in the 10-year period between January 2003 and May 2013. Demographical characteristics of the patients, histopathological diagnosis, the International Federation of Gynecology and Obstetrics (FIGO) anatomical and prognostic scores, use of single-agent and multi-agent chemotherapy, surgical interventions and prognosis were evaluated. Results: From 2003-2013, there were 1,173,235 deliveries and 456 GTN cases at the 28 centers. The incidence was calculated to be 0.38 per 1,000 deliveries. According to the evaluated data of 364 patients, the median age at diagnosis was 31 years (range, 15-59 years). A histopathological diagnosis was present for 45.1% of the patients, and invasive mole, choriocarcinoma and PSTTs were diagnosed in 22.3% (n=81), 18.1% (n=66) and 4.7% (n=17) of the patients, respectively. Regarding final prognosis, 352 (96.7%) of the patients had remission, and 7 (1.9%) had persistence, whereas the disease was mortal for 5 (1.4%) of the patients. Conclusions: Because of the differences between countries, it is important to provide national registration systems and special clinics for the accurate diagnosis and treatment of GTN.

Galactorrhea Probably Related with Switching from Osmotic-release Oral System Methylphenidate (MPH) to Modified-release MPH: An Adolescent Case

Ozalp Ekinci,Serkan Gunes,Nuran Ekinci 대한정신약물학회 2017 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.15 No.3

Galactorrhea, as an adverse effect of psychotropic medications, usually develops due to high dose of antipsychotics. Selective serotonin reuptake inhibitors (SSRIs) have also been reported to be related to galactorrhea. To the best of our knowledge, no previous study reported galactorrhea with methylphenidate (MPH) use. Hereby, we report a case of an adolescent girl who developed galactorrhea after increasing his modifed-release oral MPH to 50 mg/day while under treatment of sertraline and very low dose haloperidol.

Methylphenidate-induced Exacerbation of Chorea in a Child Resolved with Switching to Atomoxetine

Ozalp Ekinci,Cemre Yaşöz,Selin Ayşe İpek Baş,Nazan Ekinci,Özge İpek Doğan 대한정신약물학회 2020 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.18 No.2

Choreiform movements have been reported with stimulant medications, especially in adults. There is only limited evidence on the management of such reactions in children with attention deficit hyperactivity disorder. Hereby, we present the exacerbation of chorea with long-acting methylphenidate use in a 6-year-old child with acute rheumatic fever which resolved with switching to atomoxetine.

Comparing the precision of panoramic radiography and cone-beam computed tomography in avoiding anatomical structures critical to dental implant surgery: A retrospective study

Ozalp, Oznur,Tezerisener, Huseyin Alican,Kocabalkan, Burak,Buyukkaplan, Ulviye Sebnem,Ozarslan, Mehmet Mustafa,Kaya, Goksel Simsek,Altay, Mehmet Ali,Sindel, Alper Korean Academy of Oral and Maxillofacial Radiology 2018 Imaging Science in Dentistry Vol.48 No.4

Purpose: The aim of this study was to evaluate the correlations between measurements made using panoramic radiography and cone-beam computed tomography (CBCT) based on certain anatomical landmarks of the jaws, with the goal of preventing complications due to inaccurate measurements in the pre-surgical planning phase of dental implant placement. Materials and Methods: A total of 56 individuals who underwent panoramic radiography and a CBCT evaluation before dental implant surgery were enrolled in the study. Measurements were performed to identify the shortest vertical distance between the alveolar crest and neighboring anatomical structures, including the maxillary sinus, nasal floor, mandibular canal, and foramen mentale. The differences between the measurements on panoramic radiography and CBCT images were statistically analyzed. Results: Statistically significant differences were observed between the measurements on panoramic radiography and CBCT for all anatomical structures (P<.05). The correlation coefficients (r) between the paired samples obtained from panoramic radiography and CBCT were closely correlated (P<.05), with r values varying from 0.921 and 0.979 for different anatomical regions. Conclusion: The results of this study support the idea that panoramic radiography might provide sufficient information on bone height for preoperative implant planning in routine cases or when CBCT is unavailable. However, an additional CBCT evaluation might be helpful in cases where a safety margin cannot be respected due to insufficient bone height.

Poster Session : PS 0116 ; Cardiology : Severe Hyperkalemia and Lower Extermity Paralysis without Any Ecg Changes: A Case Report

( Veysel Ozalper ),( Ibrahim Cetindagli ),( Ergenekon Karagoz ),( Emrullah Solmazgul ),( Cihan Top ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Objective: Hyperkalemia is a common and serious clinical problem that occurs often due to impaired urinary potassium excretion because of acute or chronic kidney disease or drugs that effect renin-angiotensin-aldosterone axis. We report a hyperkalemic patient with 9.0mEq/L without any ECG changes. Case Report: A 86-year-old-woman suffering fatigue within two days had admitted emergency service because of sudden bilateral lower extremity paralysis. She had esential hypertension, ischemic heart disease and chronic kidney disease and was using Spironolactone, silazopril, asetilsalisilik, isosorbid-5-mononitrat ve karvedilol. Initial neurological examination of extremities was; 2/5 of lower extremity, 4/5 of upper extremity. Initial laboratory fi ndings potassium:9,1mmol/L, sodium:141mmol/L, creatinine: 1,9mg/dl. In his arterial blood gas analyse, pH:7.27, HCO3:16mEq/L, pCO2:30mm- Hg, potassium:9,1mmol/L. Spironolactone and silazopril treatment had stopped. With an intensive electrolyte-follow-up, She was commenced on intravenous fl uid, injection calcium gluconate and glucose/insulin infusion. Within two hours of treatment her potassium level decreased by 1.5 mmol/L. After eight hours of intensive treatment, potassium level reached below 6,5mEq/L. Five Days later, after three days of close follow-up with normal potassium level, the patient had discharged. Conclusion: ECG differancies like fl attening in U wawe, expansion in QRS, taper in T wawe, arrhytmias, asystoles can be seen in hypercalemia. Especially in the circumstances that serum potassium level is above 8 mEq/L ECG differancy is expected to be seen. So that, it is suggested that biochemical elevation in hypercalemic cases is verifi ed with ECG. Although it is rarely seen like in our cases, it shouldn`t be forgotten that severe hypercalemia can be seen without ECG differancy.

Polyglandular Autoimmune Syndrome Type-Ii Presented with Acute Renal Injury

( Veysel Ozalper ),( Ibrahim Cetindagli ),( Omer Tekin ),( Yalcin Onem ),( Yusuf Hancerli ),( Eylem Cagiltay ),( Barbaros Basbug ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Introduction: Polyglandular autoimmune syndrome (PAS) is a rare disease, characterized by failure of more than two endocrine glands. Type-II of this syndrome is the most common of the immunoendocrinopathy syndromes and characterized by the obligatory occurrence of autoimmune Addison disease in combination with thyroid autoimmune diseases and/or type-I diabetes mellitus. We report a case of PAS-TypeII presented with prerenal acute renal failure. Case Report: A twenty-two-year-old man had a hyperpigmentation of gingiva within three months, fatigue and amnesia within two months, emesis and vomit within one months, admitted because of persistent vomiting and ten kilogram weight loss. Initial laboratory fi ndings were: urea:87mg/dl, kreatinin:1.31mg/dl, sodium:125mmol/L, potassium: 5.6mmol/L, albumin:4.16g/dl, calcium:123mg/dl. In his arterial blood gas analyse, he had a normal anion gap metabolic asidosis. pH:7.24, HCO3:12.8mEq/L, pCO2:30mm- Hg. He had a prerenal acute renal injury because of persistent vomiting. Other laboratory fi ndings were Hemoglobine:12.9g/dl, TSH:0,004 uIU/ml, FreeT4:2,16ng/dl, Anti-TPO:876 IU/ml, AntiThyroglobulin:9,72IU/ml, Cpeptid:0,27ng/ml, Kortizol:0,1ug/dl, ACTH:22,8pg/ml, HbA1c: %4,7.. A thyroid-scintigraphy showed diffuse homogenous thyroid involvement. His pituitary magnetic-resonance-imaging, thoracoabdominal- tomography and esophagogastroscopy was normal. Based on his fi ndings above and intravenous ACTH stimulation test, adrenal insuffi ency and otoimmune thyroiditis were diagnosed. General condition improved gradually following the administration of hydrocortisone, fl udrocortisone, thyromazol, propranolol. Conclusions: As a conclusion, in persistant vomiting patients, endocrine functions must be performed. A patient who presents with a single autoimmune diseases must be considered at risk of other autoimmune diseases. High index of suspicion, early recognition and treatment can be life-saving, particularly when there is adrenal and thyroid component.

Reliability and Validity of Turkish Versions of the Child, Parent and Staff Cancer Fatigue Scales

Gerceker, Gulcin Ozalp,Yilmaz, Hatice Bal Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.7

This study was designed to adapt the Turkish versions of scales to evaluate fatigue in children with cancer from the perspectives of the children, parents and staff. The objective of this study was to validate "Child Fatigue Scale-24 hours" (CFS-24 hours), "Parent Fatigue Scale-24 hours" (PFS-24 hours) and "Staff Fatigue Scale-24 hours" (SFS-24 hours) for use in Turkish clinical research settings. Translation of the scales into Turkish and validity and reliability tests were performed. The validity of the translated scales was assessed with language validity and content validity. The reliability of the translated scales was assessed with internal consistency. The scales were evaluated by considering the following: calculation of the Cronbach alpha coefficient for parallel form reliability with 52 pediatric cancer patients, 86 parents and 43 nurses. The internal consistency was estimated as 0.88 for the Child Fatigue Scale-24 hours, 0.77 for the Parent Fatigue Scale-24 hours, and 0.72 for the Staff Fatigue Scale-24 hours (Cronbach's ${\alpha}$). The Turkish version of the Child Fatigue Scale -24 hours, the Parent Fatigue Scale -24 hours and the Staff Fatigue Scale -24 hours were judged reliable and valid instruments to assess fatigue in children and showed good psychometric properties. These scales should assist in understanding to what extent initiatives can minimize or eliminate fatigue. Our scales are recommended for further studies and use in pediatric oncology clinics as routine measurements and nursing initiatives should be planned accordingly.