Researcher:
Lav, Ahmet Hakan

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Undergraduate Student

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Ahmet Hakan

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Lav

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Lav, Ahmet Hakan

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2018 - 201912020 - 20221

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Researcher Of Publications: search.filters.isAuthorOfPublication.62ac1a1d-db9c-4efa-93a4-9572649c20ad

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    A fundamental experimental approach for optimal design of speed bumps
    (Elsevier, 2018) Bilgin, Ertuğrul; Lav, Abdullah Hilmi; N/A; Lav, Ahmet Hakan; Undergraduate student; School of Medicine
    Speed bumps and humps are utilized as means of calming traffic and controlling vehicular speed. Needless to say, bumps and humps of large dimensions in length and width force drivers to significantly reduce their driving speeds so as to avoid significant vehicle vertical acceleration. It is thus that this experimental study was conducted with the aim of determining a speed bump design that performs optimally when leading drivers to reduce the speed of their vehicles to safe levels. The first step of the investigation starts off by considering the following question: "What is the optimal design of a speed bump that will - at the same time - reduce the velocity of an incoming vehicle significantly and to a speed that resulting vertical acceleration does not jeopardize road safety? The experiment has been designed to study the dependent variables and collect data in order to propose an optimal design for a speed bump. To achieve this, a scaled model of 1:6 to real life was created to simulate the interaction between a car wheel and a speed bump. During the course of the experiment, a wheel was accelerated down an inclined plane onto a horizontal plane of motion where it was allowed to collide with a speed bump. The speed of the wheel and the vertical acceleration at the speed bump were captured by means of a Vernier Motion Detector.
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    PublicationOpen Access
    Frame-based stereotactic biopsy - a single neurosurgeon experience of 604 diagnostic procedures and literature review
    (Turkish Neurosurgical Society, 2022) Akyoldaş, Göktuğ; Samancı, Mustafa Yavuz; Lav, Ahmet Hakan; Peker, Selçuk; Faculty Member; Faculty Member; School of Medicine; Koç University Hospital; N/A; N/A; N/A; 11480
    Aim: to evaluate the surgical experience of the senior neurosurgeon to define the lesion, radiology, and technique-related factors that affect the diagnostic yield and complications, along with the literature review. Material and Methods: documents were examined for consecutively performed frame-based stereotactic biopsies (SBs) from 1999 to 2021. Procedures that are aimed at nondiagnostic purposes were excluded, thus leaving 604 diagnostic procedures. Diagnostic yield, complication rates, and their relationship with clinical variables were investigated. Results: The diagnostic yield was 98%, with a symptomatic hemorrhage rate of 1.2%, a total morbidity rate of 4.8%, and a mortality rate of 0.83%. Larger tumors (odds ratio [OR]=1.350), experienced neurosurgeon (OR=1.339), and pathologist (OR=462.743), and prebiopsy examination with both computed tomography and magnetic resonance imaging (MRI) (OR=27.062) were associated with an increased diagnostic yield. None of the parameters were statistically significant for nonhemorrhagic morbidity, whereas the increasing number of specimens (OR=1.395) and glial tumors (OR=3.740) were associated with an increased hemorrhagic risk. Likewise, the increasing number of specimens (OR=2.497) along with the increasing age (OR=14.098) were associated with increased mortality risk. Conclusion: knowledge of stereotactic techniques and meticulous surgical planning is required to enhance the diagnostic yield and safety of SB. Considering the results of this largest, MRI-guided, single-neurosurgeon SB series, we advocate training neurosurgeons on stereotactic techniques, routine use of intraoperative pathological examination, and working with dedicated neuropathologists when possible.