Reflection properties of a Gaussian laser beam from multilayer dielectric films

Thesis (Master)--Izmir Institute of Technology, Electronics and Communication Engineering, Izmir, 2010Includes bibliographical references (leaves: 83-85)Text in English; Abstract: Turkish and Englishxi, 85 leavesA laser microphone is a surveillance device that uses a laser beam to detect sound vibrations in a distant object. The object is typically inside a room where a conversation is taking place, and can be anything that can vibrate (for example, picture or window) in response to the sound waves of the conversation. The object preferably has a smooth surface. The laser beam is directed into the room through a window, reflected off the object and returned to a receiver that converts the beam to audio signal. The beam is mostly bounced off the window itself. Usually these kinds of devices are used by surveillance intelligence in some parts of governments and these kinds of weapons analyze the laser beam which reflects from window. In this thesis a countermeasure to the detection of laser beam is analyzed. In order to make this possible, the reflection from dielectric stratified surfaces of a Gaussian laser beam needs to be described. The reflected beam profile of electromagnetic radiation exposes to various effects different from reflected plane waves. Gaussian beams which reflect from a dielectric slab experience in a shifting maximum point in one direction; lateral shift, focal shift and angular divergence are the shift and distortion of the beam profile. The Gaussian beam propagates in z direction and broadens in transverse plane, in two dimensions and is decomposed into plane wave components. Upon analyzing the reflection coefficient and beam profile, reduction of beam power after reflection from stratified films is described

Successful Retrieval of Stripped Coronary Stents Using the Twisted Guide Wire Technique

Stent stripping during percutaneous coronary intervention is a rare but serious complication. The patient was admitted to the emergency department with chest pain. Electrocardiography revealed ST elevations in the anterolateral leads. The patient was urgently taken to the catheter laboratory. A guiding catheter without a hole was used to imagine the left coronary system. To avoid dumping, two holes were manually drilled into the distal region of the catheter with the needle tip. Occlusion was observed in the proximal region of left anterior descending artery. It was decided to implant a stent. However, when the stent arrived distal in the catheter, strain was felt. When the stent was advanced to the left main coronary artery (LMCA), it was observed that the stent detached from its balloon in the LMCA. It was planned to remove the stent using the twisted guide wire technique. In this technique, the guide wire inside the stripped stent lumen was not retracted. A second guide wire was advanced distally outside the stent lumen. Subsequently, these two parallel wires were twisted 10-15 times until the stent was trapped by the guide wires with the help of the torquer device. Twisted wires were pulled back. While the wires were retrieving, the trapped stent between guide wires was pulled back. Subsequently, a new stent was successfully implanted into the lesion. After the procedure, the damaged catheter and the removed stent were investigated. The distal inner lumen of the guiding catheters not smooth at the edges of the manually opened side holes because of protrusions. It was thought that the stent was stuck to these inner protrusions of the holes and detached from the balloon. Manually drilling a hole in the guiding catheter or any intervention disrupting the structure of the catheter should be avoided. The twisted guide wire technique is an alternative and effective method to retrieve a stripped stent

Intermittent QT prolongation induced by short-term oral amiodarone therapy

Although amiodarone appears to have few pro-arrhythmic effects, torsade de pointes (TdP) has been observed after administration of a low dose and short term use of oral amiodarone, in the absence of predisposing factors. We describe the case of a 41-year-old woman admitted to hospital because of a cardiac arrest from TdP. On hospital admission, ECG showed sinus bradycardia 46 bpm with marked QT prolongation

Structural ımage matching ın digital photogrammetry

Görüntü eşleştirme algoritmaları bugüne kadar istatiksel yaklaşımla problemi çözmeye çalışmıştır. Burada yeni bir yaklaşım denenmiş ve uzman sistem tanımlaması yapılmıştır. Bu çalışmada bulanık mantık tabanlı görüntü eşleştirme algoritması önerilmiştir. Yapılan çalışma bulanık mantığın fotogrametrik amaçlı bir uygulamasıdır. Resim ve üzerindeki modeli tanımlayan kontrol noktalarını eşleştirmek için bulanık bir algoritmayla birlikte yazılım geliştirilmiştir. Bulanık mantık algoritması bulunacak hedefin topolojik ve geometrik özelliklerinin uygunluğunu belirlemektedir. Hedefin yaklaşık koordinatları civarında yazılım, tanımlanan hedefi aramakta ve en doğru işaretleme yapılacak yerin kararını vermektedir. Bu metot için resim yaklaşık yöneltme elemanları bilinmesi ve değerlendirilen görüntülerin örtüşmeli olması gerekir. Doğruluk, bilinmeyenlerin doğruluğuna bağlıdır.  Anahtar Kelimeler: Bulanık mantık, görüntü işleme, yapısal görüntü işleme.The human vision system can be adapted easily to the insufficient data of the vision information.  We can not describe that the size color and shape of an object correctly digital every time. We use fuzziness tools for describing the ambiguity. Fuzzy Logic Image processing has been used for describing this fuzziness of the results of the human brain. The location of the corner and location of the edge of the object have been recognized in gray values of pixels also classified of gray values of pixels.  Answers of these questions have been considered, as fuzzy logic algorithm of image processing must have been used for in image processing algorithms. Image matching algorithms have been used for problem solving by statistical approaches. Herein, a new approach has been suggested and expert systems have been defined. In this study, image matching which is based on fuzzy logic algorithms is recommended. This is photogrammetric application based on fuzzy logic methodology. In order to solve the matching problem between an image patch and the model,  a control point description is developed and a software is prepared based on  fuzzy logic algorithm. This technique determines the corresponding topological and geometrical relations features of target. Software searches near the target and estimates the true pixel coordinates. This method requires some a-priori information like approximate orientation parameters and image overlap. Accuracy depends on the accuracy of a-priori information.Keywords: Fuzzy logic, image matching, structure image matching

Cases of nouns ın Bosnıan language and Turkısh language: A comparatıve analysıs

Bir Slav dili olarak Boşnakça, Slav dillerinin üç kolundan biri olan Güney Slav dilleri kolu altında yer alır. Boşnakçanın kökeni, diğer Slav dilleri için de ana dil konumunda olan Eski Slavcaya dayanır. Boşnakçanın ad durumlarını konu edinen çalışmamız, bu dildeki ad durumu çekim sistemi ile Türkçedeki çekim sitemini karşılaştırarak tanımlamayı amaçlamaktadır. Tezimizin Giriş bölümünde çalışmamızın konusu, sınırları ve yöntemi ortaya konmuştur. Bu bölümün ardından Boşnakçanın Tarihsel Gelişimi hakkında bilgi verilmiştir. Bir diğer bölümde Boşnakçadaki Adların Özellikleri anlatılmıştır. Bu bölümü takiben, çalışmamızın ana kısmını oluşturan Boşnakçadaki Ad Durumları incelenmiştir. Son olarak değerlendirmelerimizi içeren Sonuç bölümü ve çalışmamızda yararlandığımız kaynakların yer aldığı Kaynakça ve Ekler bölümü bulunmaktadır.Bosnian as a Slavic language ranks in the South Slavic languages which are one of three branches of the Slavic Languages Group. The origins of Bosnian language depend on Old (Church) Slavic language which was a primitive language of all current Slavic languages. The aim of this dissertation is to make descriptive comparison of the declension system in Bosnian language and Turkish language. In the introduction part of the dissertation, the subject, limitations and method of the study have been presented. The first chapter deals with historical development of Bosnian language. In the second chapter, features of nouns in Bosnian language have been mentioned. The following chapter analyses the cases of nouns in Bosnian language. Finally, the dissertation includes summary, bibliography and appendix sections