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Houshyar Eimani Kalehsar,Nahmat Khodaie 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.7
In the classic form of the Dynamic Vibration Absorber (DVA), a damped DVA is attached to an undamped primary mass, and themain tuning objective is to minimize the dynamic response of the primary mass. Recently proposed structural systems with the selfcontrolability such as controlled mega-substructure and core tubes with suspension systems use part of the main structure as adynamic vibration absorber. Because the DVA in the self-control structural systems is a part of the main structure, the controlobjective of these kinds of systems is dual not only to limit the motion of the primary system but also to reduce the vibration of theDVA. In the present study, the simplified classic model of the DVA with the primary mass under the harmonic excitation is studiedand the fixed-point theory is used to derive the optimum parameters of the DVA to minimize the maximum displacement andacceleration responses of the DVA. The effects of different design parameters such as the mass and stiffness ratios of the DVA on theresponse of the system are investigated. It is shown that the coordinates of one of the fixed points in both displacement andacceleration responses of the DVA are independent of the natural frequency and damping ratios. This point plays an important role inthe optimization procedure. For a specific range of the mass ratios of the DVA, the maximum response of the DVA is larger than thatof the primary mass; therefore, optimization based on the response of the DVA yields a better result for the self-control structuralsystem.
Ultrasonographic findings of mesenchymal chondrosarcoma of the mandible: report of a case
Shahidi, Shoaleh,Shakibafard, Alireza,Zamiri, Barbod,Mokhtare, Mohammad Reza,Houshyar, Maneli,Houshyar, Maral,Amanpour, Sara Korean Academy of Oral and Maxillofacial Radiology 2012 Imaging Science in Dentistry Vol.42 No.2
Today, ultrasound imaging is being widely used to assess soft tissue lesions in the maxillofacial region. However, ultrasound investigations of intra-osseous lesions are rare, especially for tumors of the jaws. This report emphasized the capability of this useful imaging modality in identification of the characteristics of malignant conditions involving the bone. Mesenchymal chondrosarcoama, one of the unusual malignant conditions of the jaw, was presented in a young male with significant facial swelling. Different imaging modalities parallel with the histopathologic investigation confirmed the diagnosis. Interestingly, destruction of the bony cortex and new bone formation with a characteristic "sun ray appearance", highly suggestive of sarcomas, was manifested on the ultrasonograph. Thus, this report presented the ultrasonographic features of chondrosarcoma of mandible and considered the ultrasonography to be a useful imaging modality to evaluate intra-osseous jaw lesions.
Ultrasonographic findings of mesenchymal chondrosarcoma of the mandible: report of a case
Shoaleh Shahidi,Alireza Shakibafard,Barbod Zamiri,Mohammad Reza Mokhtare,Maneli Houshyar,Maral Houshyar,Sara Amanpour 대한구강악안면방사선학회 2012 Imaging Science in Dentistry Vol.42 No.2
Today, ultrasound imaging is being widely used to assess soft tissue lesions in the maxillofacial region. However, ultrasound investigations of intra-osseous lesions are rare, especially for tumors of the jaws. This report emphasized the capability of this useful imaging modality in identification of the characteristics of malignant conditions involving the bone. Mesenchymal chondrosarcoama, one of the unusual malignant conditions of the jaw, was presented in a young male with significant facial swelling. Different imaging modalities parallel with the histopathologic investigation confirmed the diagnosis. Interestingly, destruction of the bony cortex and new bone formation with a characteristic “sun ray appearance”, highly suggestive of sarcomas, was manifested on the ultrasonograph. Thus, this report presented the ultrasonographic features of chondrosarcoma of mandible and considered the ultrasonography to be a useful imaging modality to evaluate intra-osseous jaw lesions.
Liver Imaging : Chemotherapy induced liver abnormalities: an imaging perspective
( Ankush Sharma ),( Roo Zbeh Houshyar ),( Priya Bhosale ),( Joon Il Choi ),( Ra Jesh Gulati ),( Chandana Lall ) 대한간학회 2014 Clinical and Molecular Hepatology(대한간학회지) Vol.20 No.3
Treating patients undergoing chemotherapy who display findings of liver toxicity, requires a solid understanding of these medications. It is important for any clinician to have an index of suspicion for liver toxicity and be able to recognize it, even on imaging. Cancer chemotherapy has evolved, and newer medications that target cell biology have a different pattern of liver toxicity and may differ from the more traditional cytotoxic agents. There are several hepatic conditions that can result and keen clinical as well as radiographic recognition are paramount. Conditions such as sinusoidal obstructive syndrome, steatosis, and pseudocirrhosis are more commonly associated with chemotherapy. These conditions can display clinical signs of acute hepatitis, liver cirrhosis, and even liver failure. It is important to anticipate and recognize these adverse reactions and thus appropriate clinical action can be taken. Often times, patients with these liver manifestations can be managed with supportive therapies, and liver toxicity may resolve after discontinuation of chemotherapy. (Clin Mol Hepatol 2014;20:317-324)
Imaging findings in a case of Gorlin-Goltz syndrome: a survey using advanced modalities
Bronoosh, Pegah,Shakibafar, Ali Reza,Houshyar, Maneli,Nafarzade, Shima Korean Academy of Oral and Maxillofacial Radiology 2011 Imaging Science in Dentistry Vol.41 No.4
Gorlin-Goltz syndrome is an infrequent multi-systemic disease which is characterized by multiple keratocysts in the jaws, calcification of falx cerebri, and basal cell carcinomas. We report a case of Gorlin-Goltz syndrome in a 23-year-old man with emphasis on image findings of keratocyctic odontogenic tumors (KCOTs) on panoramic radiograph, computed tomography, magnetic resonance (MR) imaging, and Ultrasonography (US). In this case, pericoronal lesions were mostly orthokeratinized odontogenic cyst (OOC) concerning the MR and US study, which tended to recur less. The aim of this report was to clarify the characteristic imaging features of the syndrome-related keratocysts that can be used to differentiate KCOT from OOC. Also, our findings suggested that the recurrence rate of KCOTs might be predicted based on their association to teeth.
Imaging findings in a case of Gorlin-Goltz syndrome: a survey using advanced modalities
Pegah Bronoosh,Ali Reza Shakibafar,Maneli Houshyar,Shima Nafarzade 대한영상치의학회 2011 Imaging Science in Dentistry Vol.41 No.4
Gorlin-Goltz syndrome is an infrequent multi-systemic disease which is characterized by multiple keratocysts in the jaws, calcification of falx cerebri, and basal cell carcinomas. We report a case of Gorlin-Goltz syndrome in a 23-year-old man with emphasis on image findings of keratocyctic odontogenic tumors (KCOTs) on panoramic radiograph,computed tomography, magnetic resonance (MR) imaging, and Ultrasonography (US). In this case, pericoronal lesions were mostly orthokeratinized odontogenic cyst (OOC) concerning the MR and US study, which tended to recur less. The aim of this report was to clarify the characteristic imaging features of the syndrome-related keratocysts that can be used to differentiate KCOT from OOC. Also, our findings suggested that the recurrence rate of KCOTs might be predicted based on their association to teeth.
Altered Doppler flow patterns in cirrhosis patients: an overview
Pooya Iranpour,Chandana Lall,Roozbeh Houshyar,Mohammad Helmy,Albert Yang,최준일,Garrett Ward,Scott C Goodwin 대한초음파의학회 2016 ULTRASONOGRAPHY Vol.35 No.1
Doppler ultrasonography of the hepatic vasculature is an integral part of evaluating precirrhotic and cirrhotic patients. While the reversal of the portal venous flow is a well-recognized phenomenon, other flow patterns, although not as easily understood, may play an important role in assessing the disease status. This article discusses the different characteristic flow patterns observed from the portal vein, hepatic artery, and hepatic vein in patients with liver cirrhosis or related complications and procedures. Knowledge of these different flow patterns provides additional information that may reinforce the diagnosis of cirrhosis, help in staging, and offer prognostic information for determining the direction of therapy. Doppler ultrasonography is invaluable when liver transplantation is being considered and aids in the diagnosis of cirrhosis and portal hypertension.
Liver Pathology : Composite Liver tumors: A radiologic-pathologic
( Megha Nayyar ),( David K Imagawa ),( Temel Tirkes ),( Aram N Demirjian ),( Roozbeh Houshyar ),( Kumar Sandrasegaran ),( Chaitali S Nangia ),( Tara Seery ),( P Bhargava ),( Joon Ii Choi ),( Chandana 대한간학회 2014 Clinical and Molecular Hepatology(대한간학회지) Vol.20 No.4
Bi-phenotypic neoplasm refers to tumors derived from a common cancer stem cell with unique capability to differentiate histologically into two distinct tumor types. Bi-phenotypic hepatocellular carcinoma-cholangiocarcinoma (HCC-CC), although a rare tumor, is important for clinicians to recognize, since treatment options targeting both elements of the tumor are crucial. Imaging findings of bi-phenotypic HCC-CC are not specific and include features of both HCC and CC. A combination of imaging and immuno-histochemical analysis is usually needed to make the diagnosis. (Clin Mol Hepatol 2014;20:406-410)