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오하영,오동진,김범,이숭구,김윤구,강우헌,이방훈,김혜영,허우성,김대중 대한신장학회 1998 Kidney Research and Clinical Practice Vol.17 No.6
We evaluated gastric emptying time(GET) by using Tc99m-sulfur colloid gastric emptying scintigraphy in 11 patients with CAPD(6 male, 5 female) and 14 healthy volunteers. We investigated the effect of dialysate dwelling on GET by studying twice, once without dialysate in the abdomen(drained) and once with 2 L of dialysate in the abdomen(full), and the relationship between body surface area(BSA) and delayed gastric emptying. 1) The mean of gastric emptying rate in 120 minute in patients with CAPD when drained(67.8±13.4%) was not different from that in healthy volunteers(65.4±8.6%) 2) The mean of gastric emptying rate in 120 minute when full(55.6±14.6%) was significantly lower than that when drained(67.8±13.4%)(P$lt;0.05). In four of the 11 patients(36.4%), gastric emptying was extremely delayed from normal to abnormal range when full. 3) The BSA(1.5±0.11m2)of patients who had extremely delayed GET from normal to abnormal range was smaller than that(1.74±0.22m2) of patients who had minimal delayed or unchaET when full. This study showed the patient with CAPD had normal gastric emptying when drained, and that gastric emptying was delayed by dialysate dwelling, especially in the patients who has less than 1.5m2 of body surface area. Therefore, we suggest that intermittent nocturnal peritoneal dialysis or a small volume of dialysate may be considered for the patient with small body surface area based on the adequacy.
IPv6 네트워크 환경에서 MCGA를 고려한 통합적인 보안관리 방안
오하영,채기준,방효찬,나중찬,Oh, Ha-Young,Chae, Ki-Joon,Bang, Hyo-Chan,Na, Jung-Chan 한국정보처리학회 2007 정보처리학회논문지 C : 정보통신,정보보안 Vol.14 No.1
32비트의 IPv4 주소고갈의 문제를 해결하고 보안과 QoS를 확실히 보장해 주기 위해 등장한 IPv6는 특성상 128비트로 증가된 주소공간과 네트워크를 효율적으로 관리하기 위한 주소체계, 이웃 탐색 및 주소 자동 설정 등 다양한 서비스 제공을 위해 노드와 라우터간의 주고받는 새로운 메시지들이 많이 추가되었다. 결과 IPv4에서 존재하던 공격은 물론 예측하지 못했던 새로운 공격들이 많이 등장하게 된다. IPv4에서 성공적으로 IPv6로 전환하기 위해 무엇보다 필요한 것은 안전하고 체계적인 보안 정책기반 아래 기존에 동작되고 있는 IPv4 호스트 및 라우터와 IPv6의 안전한 호환성이다. 따라서 관리자는 앞으로 도래 할 IPv6 네트워크 환경을 효율적으로 관리하기 위해서 다양한 측면에서 보안 문제를 도출하여 통합적인 보안 대응 방안을 설계해야 한다. 본 논문에서는 IPv4와 IPv6의 특성을 파악하고, IPv4/IPv6에서의 공격 측면에서 보안 취약성 분석 및 보안 문제를 도출하여 시스템 측면, IPv6 특성별 측면, 개선된 CGA인 MCGA (Modified Cryptographically Generated Address)의 제안을 통해 IPv6에서의 효율적인 보안 관리를 위한 통합적인 대응방안을 제시한다. IPv6 has appeared for solving the address exhaustion of IPv4 and for guaranteeing the problems of security and QoS. It occurs the unexpected new attacks of IPv6 as well as the existing attacks of IPv4 because of the increasing address space to 128bits and the address hierarchies for efficient network management and additions of the new messages between nodes and routers like neighbor discovery and auto address configuration for the various comfortable services. For the successful transition from IPv4 to IPv6, we should get the secure compatibility between IPv4 hosts or routers working based on secure and systematic policy and IPv6. Network manager should design security technologies for efficient management in IPv4/IPv6 co-existence network and IPv6 network and security management framework designation. In this paper, we inspected the characteristics of IPv4 and IPv6, study on security requirement for efficient security management of various attacks, protocol, service in IPv4/IPv6 co-existence and IPv6 network, and finally suggest integrated solution about security vulnerability of IPv6 network in considering of analysis of IPv6 system, host and application, IPv6 characteristics, modified CGA(MCGA).