A phenomenological study of extracurricular activities conducted in children's clubs in Turkey Turkey

Hüseyin Yolcu 한국교육개발원 2018 KEDI Journal of Educational Policy Vol.15 No.1

This study aimed to analyze the extracurricular activities at preschool and primary school stages. There were seven schools, which were managing extracurricular activities and seven administrators chosen to be consulted within the work-group of this study. Content Analysis was used to analyze the data collected during the interviews with administrators. In the arrangements of extracurricular activities in children’s clubs, the expectations and requests of the families, their socio-economic levels (SEL), and the school administrators’ manners play a significant role. As these activities have an entrance fee, while schools with low SEL are being precluded from opening such clubs, the participation at the schools with medium and upper SEL is limited.

A case of immune-mediated type 1 diabetes mellitus due to congenital rubella ınfection

Hüseyin Anıl Korkmaz,Çağatay Ermiş 대한소아내분비학회 2019 Annals of Pediatirc Endocrinology & Metabolism Vol.24 No.1

Congenital rubella infection is a transplacental infection that can cause intrauterine growth retardation, cataracts, patent ductus arteriosus, hearing loss, microcephaly, thrombocytopenia, and severe fetal injury. It has been shown that type 1 diabetes mellitus develops in 12%–20% of patients with congenital rubella infection, and disorders in the oral glucose tolerance test is observed in 40% of patients. No biochemical or serological markers exist which could indicate that type 1 diabetes was caused by a congenital rubella infection. We report a 13-year-old male patient who was admitted to our hospital with complaints of new-onset polyuria, polydipsia, urination, and weight loss. In addition, he was found to have neurosensory hearing loss, patent ductus arteriosus, and microcephaly. Immunemediated type 1 diabetes mellitus was considered due to the fact that the autoantibodies of diabetes mellitus were positive.

Identification of structural displacements utilizing concurrent robotic total station and GNSS measurements

Hüseyin Pehlivan 국제구조공학회 2022 Smart Structures and Systems, An International Jou Vol.30 No.4

Monitoring large structures is a significant issue involving public health on which new studies are constantly carried out. Although the Global Navigation Satellite System (GNSS) is the most preferable method for measuring structural displacements, total stations, one of the classical geodetic instruments, are the first devices that come to mind in cases that require complementary usage and auxiliary measurement methods. In this study, the relative displacements of the structural movements of a tower were determined using robotic total stations (RTS) and GNSS. Two GNSS receivers and two RTS observations were carried out simultaneously for 10 hours under normal weather conditions. The spectral analysis of the GNSS data was performed using fast Fourier transform (FFT), and while the dominant modal frequencies were determined, the total station data were balanced with the least-squares technique, and the position and position errors were calculated for each measurement epoch. It has been observed that low-frequency structural movements can be determined by both methods. This result shows that total station measurements are a helpful alternative method for monitoring large structures in situations where measurements are not possible due to the basic handicaps of GNSS or where it is necessary to determine displacements with short observations.

Recurrent and Massive Life Threatening Epistaxis due to Nasal Heroin Usage

Hüseyin Yaman,Yusuf Aydın,Süleyman Yılmaz,Elif Önder,Ender Güçlüm,Özcan Öztürk 대한이비인후과학회 2011 Clinical and Experimental Otorhinolaryngology Vol.4 No.3

Epistaxis, active bleeding from the nose, is a common ear nose and throat emergency, and can be severe or even fatal. We report a severe life threatening recurrent massive nasal bleeding caused by intranasal heroin use that has not hitherto been reported in the English literature. A 24-year-old male who took heroin several times nasally presented with massive nasal bleeding. A blood transfusion and an operation to halt nasal bleeding were required. The patient did not experience a bleeding attack 2 months following cessation of nasal heroin use.

Effect of Preputial Type on Bacterial Colonization and Wound Healing in Boys Undergoing Circumcision

Hüseyin Tarhan,Ilker Akarken,Osman Koca,Işık Ozgü,Ferruh Zorlu 대한비뇨의학회 2012 Investigative and Clinical Urology Vol.53 No.6

Purpose: In this study, we evaluated the effect of preputial type on bacterial colonization and wound healing in boys undergoing circumcision. Materials and Methods: This study consisted of 78 boys consecutively admitted to our clinic for circumcision between 2009 and 2011. Preputial status was classified into five types on the basis of preputial retractability. One sterile culture swab was swept circumferentially once around the surface of the glans starting just proximal to the urethral meatus. Three weeks following circumcision, control swabs from the same regions of the same patients were taken and inoculated. Thus, the same patients formed the control group. Patients were evaluated on days 1 and 7 after the operation to assess whether the preputial type affected healing. Results: The mean age of the children was 46.3 months. In our study, the growth rate was 71.8% in pre-circumcision patients, whereas the rate was 10.25% in the post-circumcision group. Types 1, 2, 3, 4, and 5 had 100%, 93.8%, 71.4%, 44.4%, and 53.6% colonization, respectively. A significant difference was observed among these types in terms of colonization. The most common agent was Enterococcus species (33%). When postoperative patients were evaluated, all had local swelling and hyperemia on postoperative day 1, whereas there was a significant difference on day 7. Conclusions: There was a significant correlation between preputial type and bacterial colonization, and the preputial type affected post-circumcision wound healing. Practitioners should keep in mind that the healing period will be longer in patients with type 1, 2, and 3 preputium. Purpose: In this study, we evaluated the effect of preputial type on bacterial colonization and wound healing in boys undergoing circumcision. Materials and Methods: This study consisted of 78 boys consecutively admitted to our clinic for circumcision between 2009 and 2011. Preputial status was classified into five types on the basis of preputial retractability. One sterile culture swab was swept circumferentially once around the surface of the glans starting just proximal to the urethral meatus. Three weeks following circumcision, control swabs from the same regions of the same patients were taken and inoculated. Thus, the same patients formed the control group. Patients were evaluated on days 1 and 7 after the operation to assess whether the preputial type affected healing. Results: The mean age of the children was 46.3 months. In our study, the growth rate was 71.8% in pre-circumcision patients, whereas the rate was 10.25% in the post-circumcision group. Types 1, 2, 3, 4, and 5 had 100%, 93.8%, 71.4%, 44.4%, and 53.6% colonization, respectively. A significant difference was observed among these types in terms of colonization. The most common agent was Enterococcus species (33%). When postoperative patients were evaluated, all had local swelling and hyperemia on postoperative day 1, whereas there was a significant difference on day 7. Conclusions: There was a significant correlation between preputial type and bacterial colonization, and the preputial type affected post-circumcision wound healing. Practitioners should keep in mind that the healing period will be longer in patients with type 1, 2, and 3 preputium.

Frequency analysis of GPS data for structural health monitoring observations

Hüseyin Pehlivan 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.66 No.2

In this study, low- and high-frequency structure behaviors were identified and a systematic analysis procedure was proposed using noisy GPS data from a 165-m-high tower in İstanbul, Turkey. The raw GPS data contained long- and short-periodic position changes and noisy signals at different frequencies. To extract the significant results from this complex dataset, the general structure and components of the GPS signal were modeled and analyzed in the time and frequency domains. Uncontrolled jumps and deviations involving the signal in the time domain were pre-filtered. Then, the signal was converted to the frequency domain after applying low- and high-pass filters, and the frequency and periodic component values were calculated. The spectrum of the tower motion obtained from the filtered GPS data had dominant peaks at a low frequency of 1.15572×10-4 Hz and a high frequency of 0.16624 Hz, consistent with two equivalent GPS datasets. Then, the signal was reconstructed using inverse Fourier transform with the dominant low frequency values to obtain filtered and interpretable clean signals. With the proposed sequence, processing of noisy data collected from the GPS receivers mounted very close to the structure is effective in revealing the basic behaviors and features of buildings.

Usability of inclinometers as a complementary measurement tool in structural monitoring

Hüseyin Pehlivan,Halim Ferit Bayata 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.58 No.6

In the last few years, many structural monitoring studies have been performed using different techniques to measure structures of different scales such as buildings, dams or bridges. One of the mostly used tools are GPS instruments, which have been utilized in various combinations with accelerometers and some other conventional sensors. In the current study, observation series were recorded for 8 hours with GPS receivers (NovAtel) and Inclination Measurement Sensors mounted on a television tower in Istanbul, Turkey. Each series of observations collected from two different sensors were transformed into a single coordinate system (Local Topocentric Coordinates System). The positional changes of the tower were calculated from the GPS and the inclination data. These changes were plotted in two dimensions (2D) on the same graphic. Thus, the possibility of comparison and analysis were found using the data from both the GPS and the Inclinometer complement each other, in the real test area. The positional changes of the tower were modeled for further examination. As a result, the movement of the tower within an area of 1×1 cm2 was observed. Based on the results, it can be concluded that inclinometers can be used for monitoring the structural behavior of the tower.

Synthesis and Antibacterial Activities of Boronic Acid-Based Recyclable Spherical Polymer Brushes

Hüseyin Cicek,Gökhan Kocak,Özgür Ceylan,Vural Bütün 한국고분자학회 2019 Macromolecular Research Vol.27 No.7

Crosslinked poly(4-vinylbenzyl chloride) (PVBC) microbead was prepared by suspension polymerization. Various spherical polymer brushes (SPBs) were produced by grafting polymeric chains on their surfaces via surface initiated-atom transfer radical polymerization (SI-ATRP) using 4-vinylphenyl boronic acid (VPBA), 2- (dimethylamino)ethyl methacrylate (DMA), and quaternized DMA (QDMA). PVBCg- PDMA, PVBC-g-PQDMA, PVBC-g-PVPBA, PVBC-g-P(VPBA-b-DMA), PVBC-g-P(VPBAco- DMA) and PVBC-g-P(VPBA-b-QDMA) SPBs were characterized using nuclear magnetic resonance spectroscopy, attenuated total reflection Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. Antibacterial activities of the synthesized SPBs were investigated against Escherichia coli and Staphylococcus aureus in nutrient and nutrient free media. Although PVBC-g-P(VPBA-b-DMA) SPB provided high antibacterial activity in the nutrient containing media due to its antibacterial, anti-biofilm and anti-QS properties, PVBC-g-P8QDMA SPB was found to be more effective in nutrient free media. Considering repeatable antibacterial activity, the PVBC-g-P(VPBA-b-8QDMA) SPB has advantageous over PVBC-g-P(VPBA-b-DMA) and PVBC-g-P8QDMA SPBs for long-term applications such as wastewater treatment in fluidized bad system.

Modelling and optimization of Fenton processes through neural network and genetic algorithm

Hüseyin Cüce,Fulya Aydın Temel,Ozge Cagcag Yolcu 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11

Response surface methodology (RSM), multi-layer perceptron trained by Levenberg-Marquardt (MLPLM); multi-layer perception and Sigma-Pi neural networks trained by particle swarm optimization (PSO) were used to effectively and reliably predict the performance of Classical-Fenton and Photo-Fenton processes. H2O2 doses, Fe(II) doses, and H2O2/Fe(II) rates were determined as independent variables in batch reactors. The performance of models was compared by using RMSE and MAE error criteria. The performance of models was also evaluated in terms of some properties of regression analysis and scatter that showed high linear relationship between the predictions of SPPSO and the actual removal values. As a distinctive aspect of this study, SPNN trained by PSO was used for the first time in the literature in this area and the best predictive results for almost all cases were generated. Moreover, the genetic algorithm (GA) was applied for SP-PSO model results to determine the optimum values of the study. According to the results of GA, under the optimum conditions Photo-Fenton processes had higher performance in each experiment. Thereby, SP-PSO produced satisfactory prediction results without the need for any additional experiments in the case that experimental designs are difficult or costly for wastewater treatment.

Photodynamic antimicrobial activity of new porphyrin derivatives against methicillin resistant Staphylococcus aureus

Hüseyin Taşlı,Ayşe Akbıyık,Nermin Topaloğlu,Vildan Alptüzün,Sülünay Parlar 한국미생물학회 2018 The journal of microbiology Vol.56 No.11

Methicillin resistant Staphylococcus aureus (MRSA) with multiple drug resistance patterns is frequently isolated from skin and soft tissue infections that are involved in chronic wounds. Today, difficulties in the treatment of MRSA associated infections have led to the development of alternative approaches such as antimicrobial photodynamic therapy. This study aimed to investigate photoinactivation with cationic porphyrin derivative compounds against MRSA in in-vitro conditions. In the study, MRSA clinical isolates with different antibiotic resistance profiles were used. The newly synthesized cationic porphyrin derivatives (PM, PE, PPN, and PPL) were used as photosensitizer, and 655 nm diode laser was used as light source. Photoinactivation experiments were performed by optimizing energy doses and photosensitizer concentrations. In photoinactivation experiments with different energy densities and photosensitizer concentrations, more than 99% reduction was achieved in bacterial cell viability. No decrease in bacterial survival was observed in control groups. It was determined that there was an increase in photoinactivation efficiency by increasing the energy dose. At the energy dose of 150 J/cm2 a survival reduction of over 6.33 log10 was observed in each photosensitizer type. While 200 μM PM concentration was required for this photoinactivation, 12.50 μM was sufficient for PE, PPN, and PPL. In our study, antimicrobial photodynamic therapy performed with cationic porphyrin derivatives was found to have potent antimicrobial efficacy against multidrug resistant S. aureus which is frequently isolated from wound infections.