686 research outputs found
Image objects detection based on boosting neural network
This paper discusses the problem of object area detection of video frames. The goal is to design a pixel accurate detector for grass, which could be used for object adaptive video enhancement. A boosting neural network is used for creating such a detector. The resulted detector uses both textural features and color features of the frames
Retinoblastoma – a literature review and our experience
Retinoblastoma is the most common malignant eye tumor in children that is lethal if left untreated. The contemporary treatment modalities aim not only to save life, but also to preserve the eyes as an organwith form vision and the wich would greatly reflect on the quality of children’s lives. Historically, enucleation was the first successful therapeutic approach to reduce mortality, followed more than 100 years ago by the radiation therapy as the first attempt to save the eyes. Over the last two decades, conservative treatment of retinoblastoma has undergone an impressive development, allowing complete cure with minimal sequelae when timely diagnosed and treated. Today’s treatment protocol includes combination of selective chemotherapy, radiation therapy, laser therapy and, if necessary, systemic chemotherapy. The goal of this article is to review the up-to-date conservative management of retinoblastoma and to emphasize the importance of general practitions and pediatricians for timely diagnosis
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Identifying Place Histories from Activity Traces with an Eye to Parameter Impact.
Events that happened in the past are important for understanding the ongoing processes, predicting future developments, and making informed decisions. Important and/or interesting events tend to attract many people. Some people leave traces of their attendance in the form of computer-processable data, such as records in the databases of mobile phone operators or photos on photo sharing web sites. We developed a suite of visual analytics methods for reconstructing past events from these activity traces. Our tools combine geocomputations, interactive geovisualizations, and statistical methods to enable integrated analysis of the spatial, temporal, and thematic components of the data, including numeric attributes and texts.We also support interactive investigation of the sensitivity of the analysis results to the parameters used in the computations. For this purpose, statistical summaries of computation results obtained with different combinations of parameter values are visualized in a way facilitating comparisons. We demonstrate the utility of our approach on two large real data sets, mobile phone calls in Milano during 9 days and flickr photos made on British Isles during 5 years
Laser therapy in ROP: a literature review and our experience
Introduction: Retinopathy of prematurity (ROP) is a serious, vision threatening disease and among the leading causes of irreversible loss of vision. It affects prematurely born children, predominantly prior to the 32nd GW or with a body weight at birth below 1500 g. The highest risk for the development of ROP includes the time period of two weeks before to two weeks after the supposed due date. Materials and Methods: We included 10 prematurely born children with ROP requiring therapy. All of the children were screened by indirect ophthalmoscopy and the condition was documented by RetCam imaging. The treatment was conducted by the application of 810 nm diode laser. Results: Nine out of the 10 children were born before 32 GW and were with a body weight at birth below 1500 g. The disease was bilateral in 9 of the children. Laser therapy was applied to all 10 children and 18 eyes. Discussion and Conclusion: The active ophthalmological screening of all children born before 32 GW and with a body weight at birth below 1500 g, including all new-born children at risk, and the application of early laser treatment are the basis for the prevention of the development of irreversible visual loss
Coats disease ‒ case report
Coats disease is a rare, in about 90% of cases unilateral idiopathic eye pathology. It is characterized by telangiectatic and aneurysmally altered retinal blood vessels and progressive intra- and subretinal exudation, which can lead to exudative retinal detachment. Most often the symptoms manifest in the advanced stages. Purpose: To report a case with Coats disease. 10 year old boy, admitted to the Eye Clinic of the University Alexandrovska Hospital – Sofia, with leucocoria and strabismus of the right eye. Method: Full ophthalmic and orthoptic examination, OCT. Results: 3B stage of Coats disease of the right eye was established. The chance for improvement after surgery was evaluated as very little, so our patient remained under observation with protective glasses and prevention of complications. Conclusion: It is of great importance to early diagnose the disease, so to have more treatment options
Postsocialist disability matrix
This paper explores injustices experienced by disabled people in the postsocialist countries of Central and Eastern Europe. Drawing on Nancy Fraser’s theory of social justice, the analysis proposes a ‘matrix’ that reveals the negative impact of two factors – state socialist legacy and postsocialist neoliberalization – on disabled people’s parity of participation in three dimensions of justice – economic redistribution, cultural recognition, and political representation. The legacy of state socialism has underpinned: segregated service provision; medical-productivist understanding of disability for assessment purposes; denial of disability on everyday level; and weak disability organizing. Neoliberal restructuring has resulted in: retrenchment of disability support through decentralization, austerity, and workfare; stigmatization of ‘dependency’ through the discourse of ‘welfare dependency’; responsibilization of disabled people; and depoliticization of disability organizations by restricting their activities to service provision and incorporating them in structures of tokenistic participation. The analysis is informed by reports and academic studies of disability in the postsocialist region
Vitamin D status in children with myopia
Introduction. A dramatic increase of myopia worldwide has been observed in recent years. New risk factors for the development of myopia have been the target of numerous investigations. The basis of our research is the correlation between serum levels of vitamin D [25(OH)D] and myopia itself.Purpose: To find out the relationship between serum levels of 25(OH) D and myopia. Patients and methods: The study included 222 children with different refraction status. Full ophthalmologic examination, cycloplegic refraction, echobiometry were performed. The serum levels of 25(OH)D were measured by liquid chromatographic mass spectrometry (level of insufficiency < 80 nmol/L).Results: The average patients’ age (51% boys and 48,2% girls) was 11,7 y (SD ± 3,03). They were subdivided into two groups – children with myopia (84,7%) and those without myopia (15,3%). The mean serum 25(OH)D level of all tested was 61,48 nmol/L (16-140 nmol/L; SD ± 20,15); of myopia – 59,67 nmol/L (16-140 nmol/L; SD ± 19,30) and of the non-myopia group – 71,91 nmol/L (33-111 nmol/L; SD ± 21,79). There was a statistically significant difference in serum levels between the two groups (Р= 0,001). The risk of myopia was higher with the decrease of 25(OH)D values (OR = 1,028 ; 95% CI 1,008-1,048). Conclusion. In our investigation group we established low serum levels of 25(OH)D which indicated the need for conducting a population study of its status among Bulgarian children. The correlation between the higher risk of myopia and the vitamin D scarcity has to be further studied, also considering the factor of outdoor/sun-exposure time.
Purity-bounded uncertainty relations in multidimensional space -- generalized purity
Uncertainty relations for mixed quantum states (precisely, purity-bounded
position-momentum relations, developed by Bastiaans and then by Man'ko and
Dodonov) are studied in general multi-dimensional case. An expression for
family of mixed states at the lower bound of uncertainty relation is obtained.
It is shown, that in case of entropy-bounded uncertainty relations, lower-bound
state is thermal, and a transition from one-dimensional problem to
multi-dimensional one is trivial. Results of numerical calculation of the
relation lower bound for different types of generalized purity are presented.
Analytical expressions for general purity-bounded relations for highly mixed
states are obtained.Comment: 12 pages, 2 figures. draft version, to appear in J. Phys. A Partially
based on a poster "Multidimensional uncertainty relations for states with
given generalized purity" presented on X Intl. Conf. on Quantum Optics'2004
(Minsk, Belarus, May 30 -- June 3, 2004) More actual report is to be
presented on ICSSUR-2005, Besan\c{c}on, France and on EQEC'05, Munich. V. 5:
amended article after referees' remark
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