Recent Submissions

  • An analog neuromorphic classifier chip for ECG arrhythmia detection 

    Güngen, Murat Alp (Bilkent University, 2019-10)
    Following Moore's Law, the increase in the availability of more processing power alongside the development of algorithms that can use this power, electrocardiogram (ECG) systems are now becoming a part of our daily lives. ...
  • Non-uniformly sampled sequential data processing 

    Şahin, Safa Onur (Bilkent University, 2019-09)
    We study classification and regression for variable length sequential data, which is either non-uniformly sampled or contains missing samples. In most sequential data processing studies, one considers data sequence is ...
  • Interactive real-time RF control for MRI transmit channels 

    Yılmaz, Uğur (Bilkent University, 2019-09)
    Cardiac catheterization is one of the heavily researched areas of the real-time interventional studies in Magnetic Resonance Imaging (MRI), where elongated conductive wires are prone to excessive radiofrequency (RF) ...
  • Automated image reconstruction for non-cartesian magnetic particle imaging 

    Özaslan, Ali Alper (Bilkent University, 2019-09)
    Magnetic particle imaging (MPI) is a high-contrast imaging modality that images the spatial distribution of superparamagnetic iron oxide (SPIO) nanoparticles by exploiting their nonlinear response. In MPI, image ...
  • Electrically unbiased and half frequency driven waterborne 16×16-element 2-D phased array CMUT 

    Enhoş, Kerem (Bilkent University, 2019-09)
    Capacitive micromachined ultrasonic transducers (CMUT) are typically used as arrays consisting of separate cells or interconnected sub arrays, and these cells have several operation modes. Design procedure and ...
  • Design and analysis of metamaterial based perfect absorbers 

    Soydan, Mahmut Can (Bilkent University, 2019-09)
    Subwavelength light absorbers have an enormous potential on applications such as photodetection, optoelectronics, solar cells and sensing. Scaling down the device dimensions provides artificial and advanced properties. ...
  • Adaptive ambulance redeployment via multi-armed bandits 

    Şahin, Ümitcan (Bilkent University, 2019-09)
    Emergency Medical Services (EMS) provide the necessary resources when there is a need for immediate medical attention and play a signi cant role in saving lives in the case of a life-threatening event. Therefore, it is ...
  • Measuring and improving interpretability of word embeddings using lexical resources 

    Şenel, Lütfi Kerem (Bilkent University, 2019-08)
    As an ubiquitous method in natural language processing, word embeddings are extensively employed to map semantic properties of words into a dense vector representations. They have become increasingly popular due to their ...
  • Personalizing treatments via contextual multi-armed bandits by identifying relevance 

    Bulucu, Cem (Bilkent University, 2019-08)
    Personalized medicine offers specialized treatment options for individuals which is vital as every patient is different. One-size-fits-all approaches are often not effective and most patients require personalized care ...
  • Hybrid and model based approaches for new BCI spellers 

    Memon, Suleman Aijaz (Bilkent University, 2019-07)
    Electroencephalography (EEG) based brain-computer interfaces (BCIs), due to their non-invasive, portable and temporal resolution properties, are widely used in the field of neural engineering. In order to make BCI paradigms ...
  • Stability of third order conewise linear systems 

    Zakwan, Muhammad (Bilkent University, 2019-08)
    A conewise linear, time-invariant system is a piecewise linear system in which the state-space is a union of polyhedral cones. Each cone has its own dynamics so that a multi-modal system results. We focus our attention ...
  • Design and development of an SSVEP based low cost, wearable, and wireless BCI system 

    Waheed, Abdul (Bilkent University, 2019-08)
    It has become a challenging research topic to design and develop cheap and wearable brain-computer interface (BCI) systems but not compromising the performance. In this thesis, the design and development of a steady state ...
  • Efficient parameter mapping for magnetic resonance imaging 

    Keskin, Kübra (Bilkent University, 2019-08)
    Balanced steady-state free precession (bSSFP) is a magnetic resonance imaging (MRI) sequence that enables high signal-to-noise ratios in short scan times. However, it has elevated sensitivity to main eld inhomogeneity, ...
  • Universally polarization-insensitive achromatic metasurfaces 

    Tanrıöver, İbrahim (Bilkent University, 2019-07)
    Transparent optical components constitute the key elements of modern electro-optical systems including optical sensors, displays and imaging systems. The working principle of conventional transparent components rely on ...
  • Iterative fitting approach to CR-MREPT 

    Boğa, Çelik (Bilkent University, 2019-07)
    Electrical properties (conductivity, and permittivity, ) imaging, reveals information about the contrast between tissues. Magnetic Resonance Electrical Properties Tomography (MREPT) is one of the electrical properties ...
  • Metamaterials as broadband absorbers, tunable color filters, and multi-functional metasurfaces 

    Aalizadeh, Majid (Bilkent University, 2019-07)
    Metamaterials have enabled us to come up with artificial structures and designs that can perform optical functionalities which are not achievable with natural materials. Here we design and implement three important ...
  • Fair user scheduling for downlink power domain NOMA 

    Topçuoğlu, Zafer (Bilkent University, 2019-07)
    Non-Orthogonal Multiple Access (NOMA) has been proposed as a new radio access technique in which multiple users (the case of user pairs or triples are covered in this thesis) are allowed to use the wireless channel ...
  • Optical gain and lasing of colloidal semiconductor quantum wells intimately integrated into optical cavities 

    Sak, Mustafa (Bilkent University, 2019-07)
    Colloidal semiconductor quantum wells, also known as nanoplatelets (NPLs), attract an increasingly greater deal of interest as a promising material platform for light-generating applications. The superior optical properties ...
  • Design, fabrication, and characterization of normally-off GaN HEMTS 

    Gülseren, Melisa Ekin (Bilkent University, 2019-07)
    GaN-based high-electron-mobility transistors (HEMTs) have been developing rapidly from the time when they were first demonstrated in the 1990s. They have consistently been presented as a displacement technology to silicon ...
  • Online anomaly detection with kernel density estimators 

    Kerpiççi, Mine (Bilkent University, 2019-07)
    We study online anomaly detection in an unsupervised framework and introduce an algorithm to detect the anomalies in sequential data. We first sequentially learn the density for the observed data with a novel kernel based ...

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