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Peter Corbett described a new algorithm , Row-Diagonal Parity (RDP), for protection against double failures and described its application to RAID. The RDP algorithm uses a simple parity scheme based on EX-OR operations. Each data block belongs to one row-parity set and one diagonal parity set. In a simple RDP array, there are p + 1 disks. The stripes across(More)
Row-Diagonal Parity (RDP) is a new algorithm for protecting against double disk failures. It stores all data unencoded, and uses only exclusive-or operations to compute parity. RDP is provably optimal in computational complexity, both during construction and reconstruction. Like other algorithms, it is optimal in the amount of redundant information stored(More)
OBJECTIVE We review our experience with the use of the plate and screw method of fixation in the treatment of 160 patients with atlantoaxial instability during a 14-year period at our center. We previously described this method of fixation in 1994. METHODS Between 1988 and 2001, 160 patients with atlantoaxial instability were treated with the use of a(More)
OBJECT The author discusses the successful preliminary experience of treating selected cases of basilar invagination by performing atlantoaxial joint distraction, reduction of the basilar invagination, and direct lateral mass atlantoaxial plate/screw fixation. METHODS Twenty-two patients with basilar invagination-in which the odontoid process invaginated(More)
OBJECT The authors analyzed the cases of 190 patients with basilar invagination that was diagnosed on the basis of criteria laid down in 1939 by Chamberlain to assess the appropriate surgical procedure. METHODS Depending on the association with Chiari malformation, the anomaly of basilar invagination was classified into two groups. Eighty-eight patients(More)
The study was carried out to determine the safe site of entry and the appropriate trajectory of the screw implantation in the lateral masses of atlas (Cl) and axis (C2) during their fixation using the plate and screw technique. Fifty dried specimens of atlas and axis vertebrae were studied. Various dimensions of the lateral masses were quantitatively(More)
BACKGROUND Colloid cyst of the third ventricle is a relatively rare intracranial tumor. It generates tremendous interest for the neurosurgeon because of its benign nature, deep location, and an excellent prognosis when diagnosed early and excised. METHOD A retrospective analysis of 105 cases of third ventricle colloid cyst treated between 1967 to 1998 was(More)
STUDY DESIGN A rare case of a holocord intramedullary abscess with review of literature. OBJECTIVES Summary of clinical presentation, radiology, microbiology, etiology and management of intramedullary spinal cord abscess. Abscess involving the entire spinal cord is extremely rare and awareness of such an event could avoid delay in evacuation of the(More)
BACKGROUND Community acquired pneumonia (CAP) is a common clinical problem. The present study was designed to evaluate the clinical and bacteriological profile of CAP in Shimla. METHODS Seventy patients with community acquired pneumonia were enrolled in this study. In all the patients blood culture, sputum culture, pleural fluid culture (if available) and(More)