Mühendislik Fakültesi / Faculty of Engineering
Permanent URI for this collectionhttps://hdl.handle.net/11727/1401
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Item Diver Detection and Tracking with Different Beamforming Algorithms(2023) Sevimli, Rasim A.Diver Detection Sonars (DDS) aim to detect the diver and tracking at the specific distance. At the side of signal processing case, there are bunch of beamforming algorithms to localize the target or diver in our case in the literature. In this paper, some beamforming algorithms are combined and compared via PSNR, time each other. Some algorithms show that the effect of sidelobes and reverberation are clearly decreased. Moreover, detection and tracking algorithms are applied to artificial sonar data created with a specific scenario for this purpose.Item Multimodal Video Captioning Using Object-Auditory Information Fusion with Transformers(2023) Selbes, Berkay; Sert, MustafaVideo captioning aims to generate natural language sentences of an input video. Generating coherent natural language sentences is a challenging task due to the complex nature of video content such as object and scene understanding, extraction of object- and event-specific auditory information, and acquisition of relationships among objects. In this study, we address the problem of efficient modeling of object interactions in scenes, as they include crucial information regarding the events in the visual scene. To this end, we propose to use object features along with auditory information to better model the audio-visual scene appearing within the video. Specifically, we extract Faster R-CNN as the object features and VGGish as the auditory features and design a transformer encoder-decoder architecture in the multimodal setup. Experiments on MSR-VTT show encouraging results and object features better model the object interactions along with the auditory information in comparison to the ResNet features.Item Goodness-of-fit and Randomness Tests for the Sun's Emissions True Random Number Generator(2014) Tanyer, Suleyman Gokhun; Atalay, Kumru Didem; Inam, Sitki Cagdas; 0000-0003-0820-9186; I-5023-2013; JHU-3888-2023Random number generators ( RNGs) are one of the key tools necessary for statistical analysis and optimization methods such as Monte Carlo, particle swarm optimization ( PSO) and the genetic algorithm. Various pseudo and true RNGs are available today, and they provide sufficient randomness. Unfortunately, they generate data that do not always represent the required distribution accurately, especially when the data length is small. This could possibly threaten the 'repeatability' of an academic study. A novel true RNG ( TRNG) using the method of uniform sampling ( MUS) is recently proposed. In this work, the Sun's RF emissions MUS-TRNG is comparatively tested with well known pseudo and true RNGs. It is observed that both randomness and very high goodness-of-fit qualities are possible.Item True Random Number Generation of Very High Goodness-of-fit and Randomness Qualities(2014) Tanyer, Suleyman Gokhun; I-5023-2013The statistical nature of numerous problems in mathematics, physics and engineering have led to the development of methods for generating random data for a given distribution. Ancient methods include; dice, coin flipping and shuffling of cards. Today, various pseudo, quasi and true random generators ( RNGs) are being proposed for their improved properties. In this work, test metrics for goodness-of-fit and randomness are reviewed. The method of uniform sampling ( MUS) is modified for improving the randomness without harming the goodness-of-fit qualities. The test results illustrate that very high goodness-of-fit can be obtained even when the number of observed samples is as small as 10.Item Efficient Recognition of Human Emotional States from Audio Signals(2014) Erdem, Ernur Sonat; Sert, Mustafa; https://orcid.org/0000-0002-7056-4245; AAB-8673-2019Automatic recognition of human emotional states is an important task for efficient human-machine communication. Most of existing works focus on the recognition of emotional states using audio signals alone, visual signals alone, or both. Here we propose empirical methods for feature extraction and classifier optimization that consider the temporal aspects of audio signals and introduce our framework to efficiently recognize human emotional states from audio signals. The framework is based on the prediction of input audio clips that are described using representative low-level features. In the experiments, seven (7) discrete emotional states (anger, fear, boredom, disgust, happiness, sadness, and neutral) from EmoDB dataset, are recognized and tested based on nineteen (19) audio features (15 standalone, 4 joint) by using the Support Vector Machine (SVM) classifier. Extensive experiments have been conducted to demonstrate the effect of feature extraction and classifier optimization methods to the recognition accuracy of the emotional states. Our experiments show that, feature extraction and classifier optimization procedures lead to significant improvement of over 11% in emotion recognition. As a result, the overall recognition accuracy achieved for seven emotions in the EmoDB dataset is 83.33% compared to the baseline accuracy of 72.22%.Item Development of Computer Based Ballistocardiography System(2014) Ozturk, Nurhan; Yildiz, Metin; https://orcid.org/0000-0002-2554-6953; JJF-5070-2023Ballistocardiography is a measurement method which monitors physiologic parameters such as heart rate and respiration through measuring the vibrations caused by heart beat. In this study, a computer based system which enables monitoring the changes in the heart rate and respiration without any electrical connection with the patient is introduced. It is examined whether this system can be used in monitoring the heart beat velocity and respiration through making comparisons with a commercial data acquisition system. During the study, it is observed that heart beat velocity is determined with a maximum 5% error and respiration frequency with a maximum 5.8%. Furthermore, respiratory standstill can be detected with this system. According to these results, it could be concluded that the system can be used as pre-diagnosis with the aim of monitoring respiration disorders during sleep.Item Analysis of Heart Diseases from ECG Signal(2014) Kantar, Tugce; Koseoglu, Ovul; Erdamar, Aykut; https://orcid.org/0000-0001-8588-480X; AAA-6844-2019At the present time, the main method used in the diagnosis of heart disease is the electrocardiography (ECG). The purpose of this study is design a decision support algorithm which automatically detect the normal sinus rhythm or other pathologies. The improved algorithm will provide support to the doctor can be also used for educational purposes. Within the scope of this study, with the design of the rule based algorithm which automatically detect a normal sinus rhythm and non normal sinus rhythm, in total it can detect eight pathologies. In maincode there are thirteen functions that are used for diagnose eight different ECG pathology automatically. Higher success is being anticipated in future for the prediction power of the developed method with continuing research on the matter.Item A Feasibility Study of Communication with Cold Stimulations(2014) Budak, Erdem Inanc; Yildiz, Metin; https://orcid.org/0000-0002-2554-6953; JJF-5070-2023Some part of available sytems which requires surgery (kohlear implant) for communication of completely deaf people, other parts just heal for one side hearing impaired people (soundbite technologies). Thus, there are lot of research of tactiles that are methods for communication through skin. However, existing communication systems's speed are too low, also devices couldn't move because, they working with electricity and have big massive. In this paper we have developed alternative communication method that the system uses cold stimulus for transfer characters through skin and also first tests have been done. We used peltiers for exist to cold stimuli and developed a computer based control system to transfer to peltiers via coding. We saw that subjects perceived two stimulus per second at one point of their forearms. But when we used more than one stimulus for coding characters, perception percent get low. Overall of results, we prove that communication with thermal way is alternative method that gives promise.Item Classification of Patients with Heart Failure(2014) Bayrak, Tuncay; Ogul, Hasan; https://orcid.org/0000-0001-6826-4350; U-4603-2019Echocardiography is imaging of anatomy and physiology of heart with high frequency sound waves by using ultrasonic transducers. The signals obtained by using this method are defined as echocardiogram. In this way, the function of heart can be investigated and any abnormal case is determined according to many parameters. In this study, the classification was realized, according to 7 of features obtained from echocardiogram signals belong to 74 of patient in Machine Learning Repository (UCI) database. Naive Bayes was determined as the best classification method for this dataset and 63% sensitivity, 84% specificity, and an accuracy value of 77% has been reached. In conclusion, this study presents an investigation of determination of which features are significant in death based on heart failure.Item New Concept Design of an Insulin Pen for Visually Impaired or Blind Diabetius Mellitus Patients(2015) Ucar, Tuba; Kocak, Onur; Akpek, Ali; ABI-1247-2020Today, diabetes mellitus (diabetes) emerges as an increasingly important health problem because of the problems and frequency that it cause all over the world. Especially type 2 diabetes mellitus is increasing rapidly in all of the developed and developing society with the rapid changes in lifestyle. As of the year 2013, the number of the diabetes patients are 382 million. And this number is expected to reach 592 million increased by %55 in 2035. The main reason of this population growth due to the obesity and physical inactivity is increasing beacuse of urbanization and aging. In our country, according to result of the studies of Turkey diabetes apidemiology (TURDEP-I), type 2 diabetes mellitus %7.2, frequency of impaired glucose tolerance (IGT) %6.7 was found. In the studies of TURDEP-II that is published recently has been seen significantly increase of 2 type diabetes mellitus at age of 20 and over. Uncontrolled diabetes leading to hypoglycemia causes development of complications that affect all systems of the body. (cardiovascular system-eyes-kidney-nervous system) The risk of lower extremity amputation in diabetes patients is 25 times higher than without diabetes. Especaially in developed countries, the most common cause is visual loss and blindness. Under the light of these information, the form of insulin pen was designed that can be used more comfortable for visually handicapped people and blinds