Schmidt-Kalman Filters for Systems with Uncertain Parameters and Asynchronous Sampling

Jaroslav Taba?ek,Vladimir Havlena 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10

This paper introduces estimation algorithms for systems with uncertain parameters and asynchronous sampling. The algorithms are created by merging the Schmidt-Kalman filter (SKF) for systems with uncertain parameters and the conventional Kalman filter for systems with correlated noises. The system descriptions obtained by different discretization approaches are analyzed and used to develop the equivalent of the SKF. Then the SKF for systems with asynchronous sampling is developed by applying the SKF or its equivalent on the part of sampling period where the process and measurement noises are correlated. The accuracy of the novel filters is tested on a simple example.

Stronger Together in Lab: Multi-Center and Laboratory Spine Studies are Closer to Publication than Single-Center and Clinical Spine Studies: Snapshot of Annual Meetings of the Spine Society of Europe

Özcan-Ekşi Emel Ece,Canbolat Çağrı,Ayhan Selim,Ekşi Murat Şakir 대한척추외과학회 2020 Asian Spine Journal Vol.14 No.5

Study Design: This is a cross-sectional study of literature databases.Purpose: The purpose of this study is to analyze the predictive factors for the publication rates of spine studies.Overview of Literature: Spine research has garnered worldwide interest due to the increased number of spinal disorders in aging population.Methods: We evaluated the abstracts presented at the annual meetings of the Spine Society of Europe between 2009 and 2012. Additionally, we recorded presentation categories, study designs, research types, random assignments of the subjects, single- or multi-center- based methodologies, and significance of the results.Results: We evaluated 965 abstracts, 53.5% of which were published in peer-reviewed journals. Publication rates were significantly higher for oral presentations (62.9%) and prospective studies (61.3%) as compared to the poster presentations (46.7%) and retrospective studies (44.2%), respectively (p <0.001). Clinical studies contributed to about 86.1% of the published abstracts. However, publication rates were significantly higher for laboratory studies as compared to clinical studies (70.1% vs. 50.8%, p <0.001). Multi-center studies were closer to publication than single-center studies (67.1% vs. 52.2%, p =0.009). Our study demonstrated that multi-center studies (odds ratio, 1.81; p =0.016) and laboratory studies (odds ratio, 2.60; p <0.001) are more likely to be published.Conclusions: Multi-center collaborations dedicated to experimental studies in spine research are highly ranked and more likely to be published in peer-reviewed journals.

Nonlinear Kalman Filter by Hermite-Gauss Quadrature

Petr Hu?ek,Jan ?techa 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10

Kalman filter became a popular tool for state estimation of linear dynamical systems especially due to its simplicity. However in the case of nonlinear systems its realization is more complicated. Commonly used approach called Extended Kalman filter consists in local approximation based on linearization. Another possibility is to approximate the corresponding integrals using some feasible procedures. In this paper we apply Gauss-Hermite Quadrature for state estimation of nonlinear systems and compare its accuracy with Extended Kalman filter.

NOISE REDUCTION IN THE GORENJE INDUSTRIAL HALL

Nikola Hole?ek 한국소음진동공학회 2008 한국소음진동공학회 국제학술대회논문집 Vol.2008 No.7

Comparison of Two Secondary Sources Configurations for Active Headrest

Ond?ej Ji?i?ek,Marek Brothanek 한국소음진동공학회 2003 한국소음진동공학회 국제학술대회논문집 Vol.2003 No.8

The Levels of Cortisol and Oxidative Stress and DNA Damage in Child and Adolescent Victims of Sexual Abuse with or without Post-Traumatic Stress Disorder

S¸eref S¸ims¸ek,Tug˘ba Yüksel,I·brahim Kaplan,Cem Uysal,Hüseyin Aktas¸ 대한신경정신의학회 2016 PSYCHIATRY INVESTIGATION Vol.13 No.6

ObjectiveaaThe aim of this study was to investigate whether cortisol and oxidative stress levels and DNA damage differ between individuals who developed PTSD or not following a sexual trauma. MethodsaaThe study included 61 children aged between 5 and 17 years who sustained sexual abuse (M/F: 18/43). The patients were divided into two groups: patients with PTSD and patients without PTSD based, based on the results of a structured psychiatric interview (K-SADS-PL and CAPS-CA). Cortisol, glutathione peroxidase (GPx), superoxide dismutase (SOD), coenzyme Q, 8-Hydroxy-2-Deoxyguanosine (8-OHdG) were all evaluated by the ELISA method. ResultsaaOur evaluation revealed a diagnosis of PTSD in 51% (n=31) of victims. There was no significant difference between the groups with or without PTSD in terms of cortisol, GPx, SOD, coenzyme Q, and 8-OHdG levels. There was no correlation between CAPS scores and GPx, SOD, coenzyme Q, and 8-OHdG levels between patients with or without PTSD. In patients with PTSD, both cortisol and 8-OHdG levels decreased with increasing time after trauma, and there was no significant correlation with cortisol and 8-OHdG levels in patients without PTSD. ConclusionaaAlthough the present study did not find any difference between the groups in terms of 8-OHdG concentrations, the decreases in both cortisol and 8-OHdG levels with increasing time after trauma is considered to indicate a relationship between cortisol and DNA damage.

웨이블릿 스칼라 양자화를 이용한 지문 영상 압축 코덱 개발 및 성능 개선에 관한 연구

남재열,최지훈,손유익,Nam, Jae-Yeal,Choe, Jee-Hoon,Son, Yoo-Ek 한국정보처리학회 1998 정보처리학회논문지 Vol.5 No.8

영상은 그래픽, 교육,의료 분야의 멀티미디어 정보에서 중요한 역할을 하고 있다. 특히 지문 영상은 정보화 시대에 매우 중요한 정보로서 보안이나 인증 시스템에 널리 쓰이고 있다. 그러나 기존의 시스템에서는 지문 영상의 데이터 양이 많아 지문의 특징 정보만 일부 추출하여 저장하는 방식을 취하고 있어 지문이나 검색 등의 다양한 응용에 제약을 주고 있다. 정지 영상 압축 표준으로는 JPEG이 있지만, 20:1이상의 고압축에서는 많은 부호화 결점들 때문에 그러한 시스템에서의 실제적인 사용은 매우 어렵다. 따라서 고압축을 수행하면서 선명한 화질을 제공하는 지문 영상 압축 코덱 개발이 매우 필요하게 되었다. 본 논문에서는 이러한 요구에 맞게, 최근 새로운 영상 압축 기법으로 등장한 WSQ를 근간으로 하는 FBI 지문 영상 압축 표준을 EK르는 영상 압축 코덱을 개발하였으며, Windows95 환경하에서 동작하는 소프트웨어를 개발하여 실제로 지문 영상을 압축하는데 사용할 수 있도록 하였다. 또한 원래의 FBI 코덱과의 호환성을 유지하면서 코덱의 성능을 향상시키는 기법을 적용하여 원래의 FBI 코덱 보다 성능이 나아진 코덱을 개발하였다. 개발된 지문 영상 압축 코덱은 전자 주민 카드 및 각종 인증 시스템용 코덱으로 활용 가능하다.

함정 탑재장비의 수리부속 적정소요 산출방법에 관한 연구

황익수,이낙영 충남대학교 기초과학연구소 2000 忠南科學硏究誌 Vol.27 No.2

Many spare parts of the equipments in a battleship are necessary for maintenance. It cannot be loaded many spare parts because the area of storage is very small and crew's maintenance capacity level is limited. In this paper, the calculating methods of optimal number for the spare parts m the battleship equipments are considered using computed consumption data, and several suggestions are made for keeping high reliable accumulated data.

Concomitant Double Tumors of Myxopapillary Ependymoma Presented at Cauda Equina-Filum Terminale in Adult Patient

Ulaş Yener,Mustafa Güdük,Murat Şakir Ekşi,Murat Hamit Aytar,Aydın Sav,Serdar Özgen 대한척추신경외과학회 2016 Neurospine Vol.13 No.1

A 32-year-old man presented with gradually increasing bilateral buttock pain. He had intermittent claudication. Multiple, homogenously enhanced intradural extramedullary lesions at L2-L3 and L5-S1 levels were observed on magnetic resonance imaging. The tumors were debulked and were removed in piecemeal pattern until they had completely been resected. Histopathological examination of the surgical specimens confirmed that both tumors were myxopapillary ependymomas (MPE). MPE presenting as concomitant double tumor at conus-cauda-filum level are very rare. This kind of presentation could not be directly considered as dissemination, since both tumors were in the site of classical origin of MPE. Ten cases of double spinal MPEs have been reported to date. Including the present case, analysis of the 11 patients revealed some facts. There is a male predominance, which is opposite to the ependymomas that are commonly observed in females. Median age at presentation is 15 years. Most pronounced symptom is low back pain that sometimes radiates to lower extremities. Surgical approach was aimed in all tumors, which could be succeeded in all tumors except one. Adjuvant radiation therapy was applied in 5 patients. No recurrences have been reported after surgery or surgery + radiotherapy regimens.

Cervical Sagittal Alignment Parameters of Patients Admitted to Neurosurgery and Emergency Clinics in a State Hospital at Eastern Part of Turkey

Sümeyye Çoruh Kaplan,Murat Şakir Ekşi 대한척추신경외과학회 2015 Neurospine Vol.12 No.2

Objective: Cervical spine encompasses a bridge role between the head and the lower parts of the spine and therefore has unique properties. Our aim in this study was to evaluate the cervical sagittal alignment parameters in pediatric and adult nonsurgical patients and to find any differences in respect of age, sex and admission type. Methods: All patients who were admitted to emergency and neurosurgery clinics of Diyarbakir Bismil State Hospital due to cervical spine problems (trauma, radiculopathy, paraspinal pain) in 2014 were enrolled retrospectively into the study. Cervical anteriorposterior and lateral X-rays were obtained. Our exclusion criteria were cervical coronal deformity, multitrauma, Glasgow Coma Scale <15, traumatic disruption of the cervical spine, history of malignancy, spinal infection, metabolic or rheumatologic diseases. Results: There were 44 female and 55 male patients (n=99) in the study. Thirty-five (35.35%) of the patients were younger than 18 years of age. Mean cervical spinal alignment parameters were as follows: -42.81±11.23° (OC2), -17.15±11.48° (C2-C7), -29.82±7.60° (T1 slope), -3.62±3.05° (C3), -3.14±3.05 (C4), -3.80±2.74° (C5), -3.12±2.36° (C6), -3.43±2.53° (C7). Positive correlations were observed between age-C2C7 angle, C2C7 angle-T1 slope, C3 angle-C4 angle, C4 angle-OC2 angle, C4 angle-T1 slope, C4 angle-C5 angle. The one only negative correlation was between OC2 angle-C2C7 angle. Conclusion: In this regional study, it has been observed that global cervical lordosis increases as age increases. C4 vertebra is in the middle of this evaluation as it has many correlations with other cervical segments, which should be kept in mind when making surgical plans for this delicate spine region.