Başkent Üniversitesi Kurumsal Akademik Arşivi
Başkent Üniversitesi DSpace, üniversitemiz tarafından doğrudan veya dolaylı olarak yayınlanan kitap, makale, tez, bildiri, rapor ve araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar. Bu sistem, üniversitemizin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve yayınların etkisini artırmak amacıyla telif haklarına uygun olarak Açık Erişim imkanı sağlar.
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The Effect Of Transcranial Direct Current Stimulation On Balance, Gait Function And Quality Of Life In Patients With Stroke
(Başkent Üniversitesi Sağlık Bilimleri Fakültesi, 2024-06-06) Toktas, Nehir; Duruturk, Neslihan; Guzel, Sukran; Yuruk, Ozlem; Ozen, Selin
Transcranial direct current stimulation (tDCS) has been used in various neurological diseases due to its positive effects on cortical excitability. The aim of our study is to examine the effects of tDCS in stroke and 28 patients with stroke were randomly divided into two groups as intervention and control groups. Balance was evaluated with the Timed Up and Go Test and Berg Balance Scale. Walking functions were evaluated using the 10-meter Walk Test and the 6 Minutes Walk Test, lower extremity function was evaluated by Fugl Meyer Lower Extremity Scale, quality of life by Stroke-Specific Quality of Life Scale (SS-QOL). A task-oriented physiotherapy and rehabilitation program was applied to both groups. In addition to the task-oriented program, anodal tDCS was applied in the intervention group and carried out with a current of 2 mA, 5 days a week, 20 min, for a total of 4 weeks. In the control group, after the flow was opened for 30 s and the patient felt a tingling sensation, it was turned off without the patient noticing. As a result, significant improvement was obtained in all parameters in both groups (p < 0.05). At the difference values of both groups, only SS-QOL mobility subgroup was significant and other parameters were not significant. Considering all these results, it can be seen that tDAS applied in addition to the task-oriented training program in individuals with stroke makes a positive contribution to the patients' balance, walking function and quality of life. We think that tDAS may be a feasible and safe additional approach in this patient group.
Sustainable Biomaterials For Tissue Engineering: Electrospun Polycaprolactone Fibers Enriched With Freshwater Snail Calcium Carbonate And Waste Human Hair Keratin
(Başkent Üniversitesi Fen Edebiyat Fakültesi, 2024-06-08) Erdemli, Ozge; Yilmaz, Bengi; Saran, Irem Goksu; Serin, Erdal
This study focuses on developing a sustainable and biocompatible polycaprolactone (PCL)-based scaffold for bone tissue engineering through electrospinning, utilizing calcium carbonate (CaCO3) from Pomacea canaliculata shells and keratin from human hair, known for stimulating bone regeneration. The isolated CaCO3 has been identified to demonstrate two polymorphs, vaterite and calcite, as determined by X-ray diffraction. The isolation of keratin from human hair was confirmed through sodium dodecyl sulfate polyacrylamide gel electrophoresis and Fourier transform infrared spectroscopy analysis, revealing the presence of alpha-keratin structures around 45-50 kDa and beta-keratin structures around 55-60 kDa. According to scanning electron microscope observations, the addition of keratin to PCL fibers reduced their diameter from 457 +/- 345 to 371 +/- 103 nm. Further addition of calcium carbonate led to a mean diameter of 258 +/- 76 nm. The melting temperature of PCL fibers containing keratin and CaCO3 was determined to be 76.17 degrees C via differential scanning calorimetry, while thermogravimetric analysis, conducted at temperatures up to 600 degrees C, revealed a remaining ash content of 9.59%. Calcium phosphate accumulation was observed to initiate on PCL fibers containing keratin and CaCO3 following a 7-day exposure to simulated body fluid. The fibers exhibit cytocompatibility, showing no toxicity while supporting the growth and proliferation of Saos-2 osteosarcoma cells. The results suggest that the innovative incorporation of keratin and CaCO3 into PCL nanofibers could serve as a bioactive matrix compared to pure PCL matrices, thereby offering enhanced potential for bone tissue engineering applications. (c) 2024 The Author(s). Polymer International published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
Electrospun PCL fibers with human hair keratin and snail shell calcium carbonate were developed, analyzed via SEM, FTIR, DSC and TGA and tested for bioactivity and in vitro cell viability. image
Autonomous Landing Of A Quadrotor On A Moving Platform Using Motion Capture System
(Başkent Üniversitesi Mühendislik Fakültesi, 2024-06-08) Qassab, Ayman; Khan, Muhammad Umer; Irfanoglu, Bulent
This paper investigates the challenging problem of the autonomous landing of a quadrotor on a moving platform in a non-cooperative environment. The limited sensing ability of quadrotors often hampers their utilization for autonomous landing, especially in GPS-denied areas. The performance of motion capture systems (MCSs) in many application areas is the motivation to utilize them for the autonomous take-off and landing of the quadrotor in this research. An autonomous closed-loop vision-based navigation, tracking, and control system is proposed for quadrotors to perform landing based upon Model Predictive Control (MPC) by utilizing multi-objective functions. The entire process is posed as a constrained tracking problem to minimize energy consumption and ensure smooth maneuvers. The proposed approach is fully autonomous from take-off to landing; whereas, the movements of the landing platform are pre-defined but still unknown to the quadrotor. The landing performance of the quadrotor is tested and evaluated for three different movement patterns: static, square-shaped, and circular-shaped. Through experimental results, the pose error between the quadrotor and the platform is measured and found to be less than 30 cm.
Introducing a holistic vision system for quadrotor navigation, tracking, and landing on stationary/moving platforms. Proposing an energy-efficient, smooth, and stable MPC controller validated by Lyapunov analysis. Validating the adept tracking and safe landings of the quadrotor on stationary/moving platforms through three diverse experiments.
Effect Of Hamstring Flexibility On Cervical Range Of Motion And Deep Neck Flexor Endurance In Healthy Young Adults: A Study To Explore Myofascial Tensegrity Network
(Başkent Üniversitesi Sağlık Bilimleri Fakültesi, 2024-07-16) Ozyurek, Seher; Aktar, Burcin; Kosova, Altay; Aydin, Ebru; Turedi, Rubeysa; Pekyavas, Nihan Ozunlu
Introduction: According to the concept of biotensegrity, the whole body consists of fascial lines. The relationship between muscles and fascia is important to ensure full and proper range of motion. This study investigated the effect of hamstring flexibility on cervical range of motion and deep neck flexor muscle endurance. The aim was to explore the relationship between the hamstring muscles and neck region in the myofascial tensegrity network. Method: Sixty healthy participants with a median age of 22.0 years (24 male, 36 female) were included. Hamstring flexibility was categorized as "normal (n = 31)" or "limited (n = 29)" according to hip flexion angle (HFA) using the passive straight leg raise (PSLR) test. Active cervical range of motion was measured by the Clinometer smartphone application, and the following movements were recorded: flexion, extension and lateral flexion. The craniocervical flexion test was performed to evaluate deep neck flexor endurance using performance index and highest-pressure score. The Mann-Whitney U test was used for statistical analysis. Results: No significant differences in cervical range of motion were observed between the groups (p > 0.05). Participants with limited hamstring flexibility presented lower deep neck flexor muscle endurance scores (performance index and highest-pressure score) than participants with normal hamstring flexibility (p = 0.002, and p = 0.012, respectively). Conclusion: The results suggest that hamstring flexibility can influence deep neck flexor muscle endurance in healthy young adults. This preliminary clinical finding supports the hypothesis of a myofascial network between the hamstring muscles and neck region.
The Effects Of Aromatherapy Massage In Menopausal Women With Knee Osteoarthritis: A Randomized Controlled Study
(Başkent Üniversitesi Sağlık Bilimleri Fakültesi, 2024-06-01) Doner, S. I.; Gercek, H.; Sert, O. Akkoyun; Aytar, A.