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ABSTRACT: Performance measurement is vital for improving the health care systems. However, we are still far from having accepted performance measurement models. Researchers and developers are seeking comparable performance indicators. We developed an intelligent search tool to identify appropriate measures for specific requirements by matching diverse care settings. We reviewed the literature and analyzed 229 performance measurement studies published after 2000. These studies are evaluated with an original theoretical framework and stored in the database. A semantic network is designed for representing domain knowledge and supporting reasoning. We have applied knowledge based decision support techniques to cope with uncertainty problems. As a result we designed a tool which simplifies the performance indicator search process and provides most relevant indicators by employing knowledge based systems.
Journal of Medical Systems 02/2012; 36(1):201-21. · 1.13 Impact Factor
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ABSTRACT: This paper describes an information extraction system that extracts and converts the available information in free text Turkish radiology reports into a structured information model using manually created extraction rules and domain ontology. The ontology provides flexibility in the design of extraction rules, and determines the information model for the extracted semantic information. Although our information extraction system mainly concentrates on abdominal radiology reports, the system can be used in another field of medicine by adapting its ontology and extraction rule set. We achieved very high precision and recall results during the evaluation of the developed system with unseen radiology reports.
Computers in biology and medicine 10/2010; 40(11-12):900-11. · 1.27 Impact Factor
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ABSTRACT: Accurate, complete, and timely health data sources are essential for progress in health care. Registry and research systems are foundations for conducting clinical and epidemiological research. Developing countries lack these systems due to the scarcity of the resources allocated for health information systems. In this study, we provide an integrated model for Turkey in order to optimize the utilization of resources. The Breast Diseases Registry system (BDRS) is implemented as an integrated disease-specific system for breast diseases in order to obtain a comprehensive use of patient health data for research and Breast Cancer Registry as well as an ancillary clinical tool.
Computers in Biology and Medicine 11/2007; 37(10):1414-25. · 1.09 Impact Factor
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ABSTRACT: We present a new next generation domain search engine called MedicoPort. MedicoPort is a medical search engine designed for the users with no medical expertise. It is enhanced with the domain knowledge obtained from Unified Medical Language System (UMLS) to increase the effectiveness of the searches. The power of the system is based on the ability to understand the semantics of web pages and the user queries. MedicoPort transforms a keyword search into a conceptual search. Through our system we present a topical web crawling technique and indexing techniques empowered by the semantics information. MedicoPort aims to generate maximum output with semantic value using minimum input from the user. Since MedicoPort is designed to help people seeking information about health on the web, our target users are not medical specialists who can effectively use the special jargon of medicine and access medical databases. Medical experts have the advantage of shrinking the answer set by expressing several terms using medical terminology. MedicoPort provides the same advantage to its users through the automated use of the medical domain knowledge in the background. The results of our experiments indicate that, expanding the queries with domain knowledge, such as using the synonyms and partially or contextually relevant terms from UMLS, increase dramatically the relevance of an answer set produced by MedicoPort and the number of retrieved web pages that are relevant to the user request.
Computer Methods and Programs in Biomedicine 05/2007; 86(1):73-86. · 1.52 Impact Factor
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ABSTRACT: It is well known that excessive computational demands of public key cryptography have made its use limited especially when constrained devices are of concern. To reduce the costs of generating public key signatures one viable method is to employ a third party; the server. In open networks, getting help from a verifiable-server has an advantage over proxy-based solutions since as opposed to proxy-server, verifiable-server’s cheating can be proven.Verifiable-server assisted signatures were proposed in the past but they could not totally eliminate public key operations for the signer. In this paper, we propose a new alternative called SAOTS (server assisted one-time signatures) where just like proxy signatures generating a public key signature is possible without performing any public key operations at all. This feature results in both computational efficiency and implementation simplicity (e.g. a reduction in the code size) of the proposed protocol. In addition, SAOTS is a more promising approach since the signature is indistinguishable from a standard signature, no storage is necessary for the signer to prove the server’s cheating and the protocol works in less number of rounds (two instead of three). On the other hand, the drawback of SAOTS is the increased bandwidth requirement between the sender and server.
Computer Networks. 01/2005;
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ABSTRACT: Just like PKI, used to support public key certificates, Privilege Management Infrastructure (PMI) is built to provide a foundation Just like PKI, used to support public key certificates, Privilege Management Infrastructure (PMI) is built to provide a foundation
to employ attribute certificates. Although most of the PKI ideas can be applied to PMI as well, PMI has some unique characteristics to employ attribute certificates. Although most of the PKI ideas can be applied to PMI as well, PMI has some unique characteristics
for instance it should handle attributes containing confidential information. Motivating by this fact, Dawson et al. recently for instance it should handle attributes containing confidential information. Motivating by this fact, Dawson et al. recently
proposed a new PMI design for those who would like to use the outsourced PKI but keep the PMI management inside the organization. proposed a new PMI design for those who would like to use the outsourced PKI but keep the PMI management inside the organization.
In this paper, we propose an alternative design to have a more fine-grained control over attribute certificates. Immediate In this paper, we propose an alternative design to have a more fine-grained control over attribute certificates. Immediate
revocation and simplified verification are two big advantages of our approach. revocation and simplified verification are two big advantages of our approach.
Keywordsdigital signature-PMI-attribute certificate-revocation-binding signature semantics Keywordsdigital signature-PMI-attribute certificate-revocation-binding signature semantics
06/2004: pages 600-600;
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Nazife Baykal
Advances in experimental medicine and biology 02/2004; 553:337-58. · 1.09 Impact Factor
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ABSTRACT: The introduction of digital medical images requires a legally binding digital signature that guarantees authenticity and integrity of the image. In real-time teleradiology services, the system is expected to respond very quickly however to verify the signature a considerable amount of time is spent to compute the hash value of the image since the image size might be huge (tens of megabytes). Motivating by this fact, in this paper we propose EVEREST, an efficient methodology for verification. The key observation we have made is that in the traditional verification the processor of the verifying machine is idle (I/O blocked) while the image is downloaded. In EVEREST, to improve the real-time efficiency the receiver can perform most of the hash computation while he is receiving the image itself. One other important advantage of our scheme is the communication efficiency since getting the entire image file is no longer necessary to detect the tampering.
Studies in health technology and informatics 02/2004; 107(Pt 2):1241-5.
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Topics in Cryptology - CT-RSA 2004, The Cryptographers' Track at the RSA Conference 2004, San Francisco, CA, USA, February 23-27, 2004, Proceedings; 01/2004
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ABSTRACT: A system we call BDRS is implemented as an integrated disease specific system for breast diseases in order to obtain and use patient health data for clinical research, cancer registry and clinical care. It is an open, flexible and modular system that supports multi-institutional and multi-viewed utilization of health data. Three-tier web based architecture, and object oriented technologies have been employed to ensure its extendibility. Exchange and sharing of health data have been implemented with XML.
AMIA ... Annual Symposium proceedings / AMIA Symposium. AMIA Symposium 02/2003;
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ABSTRACT: Possible solutions to establish a survivable authentication framework in a health information system including the one based on one-time passwords (OTPs) are discussed. A new convenient method to generate OTPs is proposed.
AMIA ... Annual Symposium proceedings / AMIA Symposium. AMIA Symposium 02/2003;
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Security in Pervasive Computing, First International Conference, Boppard, Germany, March 12-14, 2003, Revised Papers; 01/2003
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Proceedings of the Eighth IEEE Symposium on Computers and Communications (ISCC 2003), 30 June - 3 July 2003, Kiris-Kemer, Turkey; 01/2003
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Computer and Information Sciences - ISCIS 2003, 18th International Symposium, Antalya, Turkey, November 3-5, 2003, Proceedings; 01/2003
