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Nesir Huseyin,Anar Huseyin 한국수학교육학회 2023 純粹 및 應用數學 Vol.30 No.2
In this paper the control system described by Urysohn type integral equation is studied. It is assumed that control functions are integrally constrained. The trajectory of the system is defined as multivariable continuous function which satisfies the system's equation everywhere. It is shown that the set of trajectories is Lipschitz continuous with respect to the parameter which characterizes the bound of the control resource. An upper estimation for the diameter of the set of trajectories is obtained. The robustness of the trajectories with respect to the fast consumption of the remaining control resource is discussed. It is proved that every trajectory can be approximated by the trajectory obtained by full consumption of the control resource.
( Huseyin Ozer ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2003 Journal of Economic Integration Vol.18 No.4
Demand elasticities are the best available indicators of how households may respond to policies which change relative prices and the level and distribution of income. In this study, income and price elasticities for eight commodity groups are estimated for Turkey based on the LES by using household level data compiled from the 1994 Household Income and Consumption Expenditures Survey conducted by the State Institute of Statistics. All estimates obtained as a result of the estimation procedure are consistent with a priori expectations and satisfy the underlying utility theory requirements.
Recurrent Retroperitoneal Cystic Lymphangioma
Huseyin Ozdemir,Ercan Kocakoc,Zulkif Bozgeyik,Bengu Cobanoglu 연세대학교의과대학 2005 Yonsei medical journal Vol.46 No.5
Retroperitoneal cystic lymphangioma is a rare congenital malformation. The majority of lymphangiomas are present at birth and nearly all present before the age of two years. We report a case of giant cystic retroperitoneal lymphangioma in a patient who first presented with symptoms at the age of 7, underwent surgery, and who then suffered a recurrent mass 11 years later.
The Volume Measurement of Air Flowing through a Cross-section with PLC Using Trapezoidal Rule Method
Huseyin CALIK 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.4
In industrial control systems, flow measurement is a very important issue. It is frequently needed to calculate how much total fluid or gas flows through a cross-section. Flow volume measurement tools use simple sampling or rectangle methods. Actually, flow volume measurement process is an integration process. For this reason, measurement systems using instantaneous sampling technique cause considerably high errors. In order to make more accurate flow measurement, numerical integration methods should be used. Literally, for numerical integration method, Rectangular, Trapezoidal, Simpson, Romberg and Gaussian Quadrature methods are suggested. Among these methods, trapezoidal rule method is quite easy to calculate and is notably more accurate and contains no restrictive conditions. Therefore, it is especially convenient for the portable flow volume measurement systems. In this study, the volume measurement of air which is flowing through a cross-section is achieved by using PLC ladder diagram. The measurements are done using two different approaches. Trapezoidal rule method is proposed to measure the flow sensor signal to minimize measurement errors due to the classical sampling method as a different approach. It is concluded that the trapezoidal rule method is more effective than the classical sampling.
Recurrent and Massive Life Threatening Epistaxis due to Nasal Heroin Usage
Hüseyin Yaman,Yusuf Aydın,Süleyman Yılmaz,Elif Önder,Ender Güçlüm,Özcan Öztürk 대한이비인후과학회 2011 Clinical and Experimental Otorhinolaryngology Vol.4 No.3
Epistaxis, active bleeding from the nose, is a common ear nose and throat emergency, and can be severe or even fatal. We report a severe life threatening recurrent massive nasal bleeding caused by intranasal heroin use that has not hitherto been reported in the English literature. A 24-year-old male who took heroin several times nasally presented with massive nasal bleeding. A blood transfusion and an operation to halt nasal bleeding were required. The patient did not experience a bleeding attack 2 months following cessation of nasal heroin use.
Evaluation and Management of Antrochoanal Polyps
Huseyin Yaman, MD,Suleyman Yilmaz, MD,Elif Karali, MD,Ender Guclu, MD,Ozcan Ozturk, MD 대한이비인후과학회 2010 Clinical and Experimental Otorhinolaryngology Vol.3 No.2
Antrochoanal polyps (ACPs) are benign polypoid lesions arising from the maxillary antrum and they extend into the choana. They occur more commonly in children and young adults, and they are almost always unilateral. The etiopathogenesis of ACPs is not clear. Nasal obstruction and nasal drainage are the most common presenting symptoms. The differential diagnosis should include the causes of unilateral nasal obstruction. Nasal endoscopy and computed tomography scans are the main diagnostic techniques, and the treatment of ACPs is always surgical. Functional endoscopic sinus surgery (FESS) and powered instrumentation during FESS for complete removal of ACPs are extremely safe and effective procedures. Physicians should focus on detecting the exact origin and extent of the polyp to prevent recurrence.
Tourette's syndrome manifests as chronic persistent cough
Huseyin Tan,Mustafa Buyukavci,Adem Arik 연세대학교의과대학 2004 Yonsei medical journal Vol.45 No.1
Tourette's syndrome (TS) is a neuropsychiatric disorder characterized by the presence of involuntary motor and phonic tics. Phonic tics can mimic respiratory system disorders such as asthma, and upper and lower respiratory system infections. We report on twins with chronic persistent cough (CPC): one of whom was followed as an asthmatic for a year and the other was diagnosed with recurrent respiratory tract infection. A careful history and neurologic assessment suggested that TS might be responsible for the first twin's symptoms but that the second one was probably in early TS. All the symptoms of the first patient diagnosed as TS showed a complete improvement with pharmacological treatment in two weeks. Since the history of CPC may in reality be TS, we recommend that TS should be considered in the differential diagnosis of pediatric CPC.
Hüseyin Pehlivan 국제구조공학회 2022 Smart Structures and Systems, An International Jou Vol.30 No.4
Monitoring large structures is a significant issue involving public health on which new studies are constantly carried out. Although the Global Navigation Satellite System (GNSS) is the most preferable method for measuring structural displacements, total stations, one of the classical geodetic instruments, are the first devices that come to mind in cases that require complementary usage and auxiliary measurement methods. In this study, the relative displacements of the structural movements of a tower were determined using robotic total stations (RTS) and GNSS. Two GNSS receivers and two RTS observations were carried out simultaneously for 10 hours under normal weather conditions. The spectral analysis of the GNSS data was performed using fast Fourier transform (FFT), and while the dominant modal frequencies were determined, the total station data were balanced with the least-squares technique, and the position and position errors were calculated for each measurement epoch. It has been observed that low-frequency structural movements can be determined by both methods. This result shows that total station measurements are a helpful alternative method for monitoring large structures in situations where measurements are not possible due to the basic handicaps of GNSS or where it is necessary to determine displacements with short observations.
A NEW THEOREM ON GENERALIZED ABSOLUTE CES`ARO SUMMABILITY FACTORS
HUSEYIN BOR 한국전산응용수학회 2020 Journal of applied mathematics & informatics Vol.38 No.5
In this paper, we have proved a new theorem dealing with varphi-|C, alpha |_{k} summability factors of infinite series under weaker conditions. Also, some new and known results are obtained.