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Zhu B, Ramsey M, Chen H. Creating a large-scale content-based airphoto image digital library. IEEE TRANSACTIONS ON IMAGE PROCESSING : A PUBLICATION OF THE IEEE SIGNAL PROCESSING SOCIETY 2000; 9:163-167. [PMID: 18255383 DOI: 10.1109/83.817609] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
This paper describes a content-based image retrieval digital library that supports geographical image retrieval over a testbed of 800 aerial photographs, each 25 megabytes in size. In addition, this paper also introduces a methodology to evaluate the performance of the algorithms in the prototype system. There are two major contributions: we suggest an approach that incorporates various image processing techniques including Gabor filters, image enhancement and image compression, as well as information analysis techniques such as the self-organizing map (SOM) into an effective large-scale geographical image retrieval system. We present two experiments that evaluate the performance of the Gabor-filter-extracted features along with the corresponding similarity measure against that of human perception, addressing the lack of studies in assessing the consistency between an image representation algorithm or an image categorization method and human mental model.
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Dunphy D, Andrews D, Seamone C, Ramsey M. Fungal keratitis following excimer laser photorefractive keratectomy. CANADIAN JOURNAL OF OPHTHALMOLOGY 1999; 34:286-9. [PMID: 10486688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
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Brown R, Taylor FC, Cohen H, Ramsey M, Miller DL, Gaminara L. Setting up a nurse-led anticoagulant clinic. PROFESSIONAL NURSE (LONDON, ENGLAND) 1998; 14:21-3. [PMID: 9866613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
People on anticoagulation therapy need regular monitoring. With appropriate training, nurse specialists can improve patient care in anticoagulant clinics.
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Brambilla R, Gnesutta N, Minichiello L, White G, Roylance AJ, Herron CE, Ramsey M, Wolfer DP, Cestari V, Rossi-Arnaud C, Grant SG, Chapman PF, Lipp HP, Sturani E, Klein R. A role for the Ras signalling pathway in synaptic transmission and long-term memory. Nature 1997; 390:281-6. [PMID: 9384379 DOI: 10.1038/36849] [Citation(s) in RCA: 392] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Members of the Ras subfamily of small guanine-nucleotide-binding proteins are essential for controlling normal and malignant cell proliferation as well as cell differentiation. The neuronal-specific guanine-nucleotide-exchange factor, Ras-GRF/CDC25Mm, induces Ras signalling in response to Ca2+ influx and activation of G-protein-coupled receptors in vitro, suggesting that it plays a role in neurotransmission and plasticity in vivo. Here we report that mice lacking Ras-GRF are impaired in the process of memory consolidation, as revealed by emotional conditioning tasks that require the function of the amygdala; learning and short-term memory are intact. Electrophysiological measurements in the basolateral amygdala reveal that long-term plasticity is abnormal in mutant mice. In contrast, Ras-GRF mutants do not reveal major deficits in spatial learning tasks such as the Morris water maze, a test that requires hippocampal function. Consistent with apparently normal hippocampal functions, Ras-GRF mutants show normal NMDA (N-methyl-D-aspartate) receptor-dependent long-term potentiation in this structure. These results implicate Ras-GRF signalling via the Ras/MAP kinase pathway in synaptic events leading to formation of long-term memories.
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Vaccaro AR, Rizzolo SJ, Allardyce TJ, Ramsey M, Salvo J, Balderston RA, Cotler JM. Placement of pedicle screws in the thoracic spine. Part I: Morphometric analysis of the thoracic vertebrae. J Bone Joint Surg Am 1995; 77:1193-9. [PMID: 7642664 DOI: 10.2106/00004623-199508000-00008] [Citation(s) in RCA: 266] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We studied the morphology of the thoracic vertebrae in the spines of seventeen human cadavera in order to define parameters that could be used as guidelines for the placement of hooks and screws in the pedicles to obtain internal fixation. We also reviewed computerized tomographic scans of nineteen thoracic spines in living patients who had no evidence of any vertebral deformity. The transverse diameter of the pedicle, which helps to determine the size of the screw, ranged from a mean (and standard deviation) of 4.5 +/- 1.2 millimeters in the fourth thoracic vertebra to a mean of 7.8 +/- 2.0 millimeters in the twelfth thoracic vertebra. The pedicles were inclined anteromedially throughout the thoracic spine, and the angle ranged from 0.3 degree toward the midline in the twelfth thoracic vertebra to 13.9 degrees in the fourth thoracic vertebra. The morphometric data revealed wide variations in the dimensions of the pedicles, demonstrating the importance of accurate preoperative imaging with transaxial computerized tomographic scans to visualize the precise osseous margins and angles of insertion of the thoracic pedicles.
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Ward RJ, Ramsey M, Dickson DP, Hunt C, Douglas T, Mann S, Aquad F, Peters TJ, Crichton RR. Further characterisation of forms of haemosiderin in iron-overloaded tissues. EUROPEAN JOURNAL OF BIOCHEMISTRY 1994; 225:187-94. [PMID: 7925437 DOI: 10.1111/j.1432-1033.1994.00187.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The biochemical and biophysical properties of isolated haemosiderins have been compared to that of another iron-containing protein, termed prehaemosiderin, which sediments through chaotropic potassium iodide only after 20 h of ultracentrifugation, in contrast to that of haemosiderin which is recovered after 2 h of ultracentrifugation. The iron/protein ratio and iron/phosphate ratio were less that that of the corresponding haemosiderin, while the elemental composition was also reduced in many of the prehaemosiderin samples. Mossbauer spectroscopy and electron diffraction identified the predominant presence of ferrihydrite in prehaemosiderin species even though the secondary haemochromatosis haemosiderin iron cores were essentially goethite-like. The majority of the prehaemosiderins isolated showed the presence of an additional peptide band at 17 kDa in addition to that at 21 kDa. Further Mossbauer studies of haemosiderin isolated from untreated secondary haemochromatosis patients showed that goethite was the predominant form of iron present, thereby indicating that the presence of this form of ferrihydrite was not wholly attributable to chelation therapy.
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Ramsey M. Automatic oscillometric NIBP (noninvasive automatic blood pressure machines) versus manual auscultatory blood pressure in the PACU. J Clin Monit Comput 1994; 10:136-9. [PMID: 8207455 DOI: 10.1007/bf02886828] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Block FE, Schulte GT, Morris T, Ramsey M. The "Torrstick": a ruler calibrated in millimeters of mercury for measurement of hydrostatic pressure. J Clin Monit Comput 1992; 8:136-8. [PMID: 1583549 DOI: 10.1007/bf01617433] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We have designed and constructed a ruler ("Torrstick") calibrated in millimeters of mercury for the measurement of hydrostatic pressure differences. Marks are placed on a measuring stick every 1.34 cm, to afford the best compromise between a column of 0.9% saline solution and a column of blood. Several uses for this ruler are proposed, including the measurement of central venous pressure.
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Carmichael AJ, Marks R, Weston C, Ramsey M, Stephens M. Pruritus after cardiopulmonary bypass. Lancet 1992; 339:815-6. [PMID: 1347846 DOI: 10.1016/0140-6736(92)91950-d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abernathey CD, Ramsey M, Knight K. Utilization of image-derived computer-assisted stereotaxis in a community-based practice setting. Stereotact Funct Neurosurg 1992; 58:99-102. [PMID: 1439359 DOI: 10.1159/000098980] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The success of a community-based stereotactic program is dependent upon community commitment, technological capability, referral base, patient/family support and, most importantly, proper patient selection. To develop a program of superior quality requires not only a substantial financial commitment, but also a basic philosophical approach which fully supports acquisition and education of support staff, physical plant renovation and an establishment of an expanding referral base. This report details the development of a highly sophisticated stereotactic program in Cedar Rapids, Iowa, a semirural community with a base referral population of approximately 300,000.
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Ramsey M. Health for sale: quackery in England, 1660-1850. MEDICAL HISTORY 1992; 36:91-6. [PMID: 16562301 PMCID: PMC1036526 DOI: 10.1017/s0025727300054673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
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Ramsey M. Environment, health, and medicine in the old regime. THE JOURNAL OF INTERDISCIPLINARY HISTORY 1989; 19:611-619. [PMID: 11617375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Watson CA, Ross JE, Ramsey M. Identification of neurosurgical patients susceptible to pulmonary infection. J Neurosci Nurs 1984; 16:123-7. [PMID: 6564138 DOI: 10.1097/01376517-198406000-00002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ramsey M, Leonard J. History of a profession, annales style: the work of Jacques Leonard. JOURNAL OF SOCIAL HISTORY 1983; 17:319-338. [PMID: 11635269 DOI: 10.1353/jsh/17.2.319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ramsey M. The repression of unauthorized medical practice in eighteenth-century France. EIGHTEENTH CENTURY LIFE 1982; 7:118-135. [PMID: 11631959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ramsey M. Traditional medicine and medical enlightenment: the regulation of secret remedies in the ancien regime. HISTORICAL REFLECTIONS. REFLEXIONS HISTORIQUES 1982; 9:215-232. [PMID: 11632122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ramsey M. [Not Available]. QUADERNI STORICI 1981; 16:959-1011. [PMID: 11630884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ramsey M. [Not Available]. REVUE D'HISTOIRE MODERNE ET CONTEMPORAINE 1980; 27:485-500. [PMID: 11632959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ramsey M. [Not Available]. REVUE D'HISTOIRE MODERNE ET CONTEMPORAINE 1980; 27:485-500. [PMID: 11635726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ramsey M, Barr RC, Spach MS. Comparison of measured torso potentials with those simulated from epicardial potentials for ventricular depolarization and repolarization in the intact dog. Circ Res 1977; 41:660-72. [PMID: 908112 DOI: 10.1161/01.res.41.5.660] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Ramsey M. Medical power and popular medicine: illegal healers in nineteenth-century France. JOURNAL OF SOCIAL HISTORY 1977; 10:560-587. [PMID: 11632359 DOI: 10.1353/jsh/10.4.560] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Barr RC, Ramsey M, Spach MS. Relating epicardial to body surface potential distributions by means of transfer coefficients based on geometry measurements. IEEE Trans Biomed Eng 1977; 24:1-11. [PMID: 832882 DOI: 10.1109/tbme.1977.326201] [Citation(s) in RCA: 192] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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