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Pancreatic ductal adenocarcinoma associated with pancreatic ductal intraepithelial neoplasia:report of a case

Hepatobiliary & Pancreatic Diseases International 2007年第5期6卷 553-556页

作者： rajkumar krishnasamy Shaleen Agarwal Shivendra Singh Sunil Puri Puja Sakhuja Anil K Agarwal Department of Gastrointestinal Surgery Govind Ballabh Pant Hospital and Maulana Azad Medical College(Delhi University)New Delhi 110002India Department of Radiology Govind Ballabh Pant Hospital and Maulana Azad Medical College(Delhi University)New Delhi 110002 Department of Pathology Govind Ballabh Pant Hospital and Maulana Azad Medical College(Delhi University)New Delhi 110002

BACKGROUND:The presence of pancreatic ductal intraepithelial neoplasia in patients with chronic pancreatitis is a risk factor for development of pancreatic adenocarcinoma. METHOD:A case of pancreatic ductal adenocarcinoma associated with pancreatic ductal intraepithelial neoplasia was diagnosed in the setting of chronic pancreatitis. RESULTS:Distal pancreatectomy combined with splenec- tomy was performed with a diagnosis of pancreatic body carcinoma.Histopathological examination suggested adenocarcinoma associated with pancreatic ductal intraepithelial neoplasia.The tumor was detected in the remaining head of the pancreas,for which a total pancreatectomy was done. CONCLUSIONS:When a patient with pancreatic ductal intraepithelial neoplasia associated with adenocarcinoma of the pancreas in the setting of chronic pancreatitis is at an increased risk of recurrence in the remaining pancreatic parenchyma,total pancreatectomy may be feasible.

关键词： pancreatectomy pancreatic ductal carcinoma chronic pancreatitis

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Secure Data Sharing with Confidentiality,Integrity and Access Control in Cloud Environment

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Computer Systems Science & Engineering 2022年第2期40卷 779-793页

作者： V.rajkumar M.Prakash V.Vennila Department of Computer Science and Engineering Krishnasamy College of Engineering and Technology(Affiliated to Anna UniversityChennai)Cuddalore607109India Department of Computer Science and Engineering School of ComputingSRM Institute of Science&TechnologyKattankulathur603203India Department of Computer Science and Engineering K.S.R.College of Engineering(Affiliated to Anna UniversityChennai)Tiruchengode637215India

Cloud storage is an incipient technology in today’s world.Lack of security in cloud environment is one of the primary challenges faced these days.This scenario poses new security issues and it forms the crux of the current work.The current study proposes Secure Interactional Proof System(SIPS)to address this challenge.This methodology has a few key essential components listed herewith to strengthen the security such as authentication,confidentiality,access control,integrity and the group of components such as AVK Scheme(Access List,Verifier and Key Generator).It is challenging for every user to prove their identity to the verifier who maintains the access list.Verification is conducted by following Gulliou-Quisquater protocol which determines the security level of the user in multi-step authentication process.Here,RSA algorithm performs the key generation process while the proposed methodology provides data integrity as well as confidentiality using asymmetric encryption.Various methodological operations such as time consumption have been used as performance evaluators in the proposed SIPS protocol.The proposed solution provides a secure system for firm data sharing in cloud environment with confidentiality,authentication and access control.Stochastic Timed Petri(STPN)Net evaluation tool was used to verify and prove the formal analysis of SIPS methodology.This evidence established the effectiveness of the proposed methodology in secure data sharing in cloud environment.

关键词： Secure interactional proof system access control multi-step authentication Gulliou-Quisquater protocol

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