175 years of linear programming: minimax and cake

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175 Years of linear programming: 2. Pivots in column space

The simplex method has been the veritable workhorse of linear programming for five decades now. An elegant geometric interpretation of the simplex method can be visualised by viewing the animation of the algorithm in acolumn space representation. In fact, it is this interpretation that explains why it is called the simplex method. The extreme points of the feasible region (polyhedron) of the linear programme can be shown to correspond to an arrangement of simplices in this geometry and the pivoting operation to a physical pivot from one simplex to an adjacent one in the arrangement. This paper introduces this vivid description of the simplex method as a tutored dance of simplices performing 'pivots in column space'

Turf wars in radiology: what must academic radiology do?

In a previous article in this series, we called upon private practice radiology groups to better support radiology research financially, but also pointed out that academic radiology must make some changes as well. In this article, we discuss those changes in detail. They include revising the structure of the radiology residency, changing the timing of the American Board of Radiology oral examinations, requiring that all residents receive research training, and emphasizing the value of clinical and translational research. The Society of Chairmen of Academic Radiology Departments (SCARD) needs to assume a leadership role in implementing these changes

Solid Waste Research in India during 2008-2017: A Bibliometric Analysis

This paper presents a bibliometric overview of Indian researchers publications published on “Solid Waste” in the Web of Science database from 2008 to 2017. Several aspects have been analyzed in the study; such as the growth and distribution of solid waste research in India, the most productive organization/institution in India, authorship pattern, document type, the high frequency of authors’ keywords, measuring the source of publications, and the international collaboration in India’s research output and so on. The highest number of contributions has been recorded in 2017 alone 216 papers, (21.49%) published and the lowest was 2008 with 71 papers, (7.06%). The study has revealed that the publication growth increased progressively from 2008 to 2017. Kumar S (30 papers; TLCS 54; TGCS 411) is been the most productive author out of the total 3609 authors. The maximum number of articles 855 (85.07%) in total are published in the journals. It has been found that ‘Waste Management (79, 7.9%)’ was the most preferred journal of the Indian researchers. The Indian authors have major collaborations with the USA, China, South Korea, Saudi Arabia, Germany, Japan and the UK

Trends in the utilization of outpatient advanced imaging after the deficit reduction act.

PURPOSE: After the Deficit Reduction Act (DRA) took effect in 2007, there was concern that private office-based imaging facilities would close, that advanced imaging would shift to less convenient hospital-based facilities, and that access to advanced imaging might be restricted. The aim of this study was to see if these developments occurred during the years after the DRA. METHODS: Using Medicare data, outpatient CT, MRI, and nuclear medicine trends before and after the DRA were studied. Procedure volumes performed in private offices and hospital outpatient departments (HOPDs) were tabulated separately. Volumes were tracked from 2000 to 2006 (before the DRA) and from 2007 to 2009 (after the DRA), and compound annual growth rates were calculated for the two periods. RESULTS: In all 3 modalities, growth before the DRA was far more rapid than afterward. Compound annual growth rates from 2007 to 2009 in offices and HOPDs were, respectively, +2.1% and +0.5% for CT, -1.1% and +1.0% for MRI, and -1.7% and -2.5% for nuclear medicine. Growth trends in all 3 modalities showed distinct flattening beginning around 2005 to 2006. CONCLUSIONS: From 2007 to 2009 (after the DRA), there was more rapid CT volume growth in offices than in HOPDs. Concurrently, there was some loss of nuclear medicine volume in both settings, but the loss was less in offices. Thus, in CT and nuclear medicine, offices actually fared better after the DRA than HOPDs. In MRI, HOPDs fared slightly better than offices. It thus seems that there has been no shift away from offices and as yet no loss of access to CT or MRI after the DRA. However, some loss of access to nuclear medicine does seem to have occurred

Department of Radiology-Annual Executive Summary Report-July 1, 2002 to June 30, 2003

94 page Department of Radiology Annual Executive Summary Report, July 1, 2002 to June 30, 2003, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, United States

Department of Radiology-Annual Executive Summary Report-July 1, 2006 to June 30, 2007

91 page Department of Radiology Annual Executive Summary Report, July 1, 2006 to June 30, 2007, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, United States

Department of Radiology-Annual Executive Summary Report-July 1, 2008 to June 30, 2009

87 page Annual Executive Summary Report from Department of Radiology, Thomas Jefferson University, Philadelphia, Pennsylvania, United States. Table of Contents: Department of Radiology Chairman, Vice Chairmen 1 Divisions and Directors 1 Committees and Chairmen 1 Radiology Department Faculty Rank 2 Faculty with Secondary Appointments 3 Clinical Divisions 4 Radiology Residents and Fellows 5 Department Organizational Chart 6 Department Administration Chart 7 State of the Department 8 Appendix I: Publications Journal Articles 21 Books and Book Chapters 29 Abstracts 30 Appendix II: Formal Scientific Presentations 40 Appendix III: Honors, Editorial Activities, Service to Regional or National Organizations 61 Appendix IV: Active Grants 74 Appendix V: Pending Grants 8

Department of Radiology-Annual Executive Summary Report-July 1, 2011 to June 30, 2012

93 page Department of Radiology Annual Executive Summary Report, July 1, 2011 to June 30, 2012, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, United States. Table of Contents Chairman, Vice Chairmen 1 Divisions and Directors 1 Committees and Chairmen 1 Radiology Department Faculty Rank 2 Faculty with Secondary Appointments 3 Clinical Divisions 4 Radiology Residents and Fellows 5 Department Organizational Chart 6 Department Administration Chart 7 State of the Department 8 Appendix I: Publications Journal Articles 23 Books and Book Chapters 31 Abstracts 35 Appendix II: Formal Scientific Presentations 50 Appendix III: Honors, Editorial Activities, Service to Regional or National Organizations 68 Appendix IV: Active Grants 82 Appendix V: Pending Grants 8