• Childhood Kidney Diseases
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• v.20 no.2
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• pp.97-100
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• 2016

Toxic epidermal necrolysis (TEN) is a rare, acute, serious, and potentially fatal skin disease, in which cell death causes the epidermis to separate from the dermis. It is thought to be a hypersensitivity complex that affects the skin and mucous membranes, and is caused by certain medications, infections, genetic factors, underlying immunologic disease, or more rarely, cancers. We report two cases of TEN associated with deflazacort (DFZ), a derivative of prednisolone, used in the first episode of nephrotic syndrome (NS). The skin eruption appeared on the $4^{th}$ and $5^{th}$ weeks after DFZ administration, while NS was in remission. The widespread lesions were managed by intensive supportive treatment, discontinuation of DFZ, and oral administration of cyclosporine. Both patients showed a rapid improvement in symptoms of TEN without any complications or relapse of NS.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.1
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• pp.92-99
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• 2008

KOMSAT-5 will attach an laser retroreflector array for precise orbit determination. Laser retroreflector array was developed by DFZ in Germany and have pyramid type composed of four corner cube prisms. In this paper, the performance analyses as effective area of retroreflector and photons measured by link budget and position of ground station were performed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.819-821
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• 2007

The explosive growth of the Internet brought serious problems to the Internet routing infrastructure. Especially scaling problems is recognized more seriously. The ever increasing user population, as well as multiple other factors including multi-homing, traffic engineering, and policy routing, have been driving the growth of Default Free Zone (DFZ) routing table size at an alarming rate. While it has been long recognized that the existing routing architecture may have serious scalability problems, effective solutions have yet to be identified, developed, and deployed. Recently, several attempts for finding the concrete problems are made. Especially the report of the routing and addressing workshop which the IAB (Internet Architecture Board) held on 2006 is described the problems of the current internet in detail. This document describes those problems and introduces the related activity to solve the problems.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.12
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• pp.2211-2217
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• 2016

The Locator/Identifier Separation Protocol (LISP) is a new routing architecture that implements a new semantic for IP addressing. It enables the separation of IP addresses into two new numbering spaces: Endpoint Identifiers (EIDs) and Routing Locators (RLOCs). This approach will solve the issue of rapid growth of the Internet's DFZ (default-free zone). In this paper, we propose an algorithm called the Propagated-Mode Mapping System to improve the map request process of LISP-DDT.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.427-429
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• 2003

최근 IPv6 망에 멀티호밍을 제공하기 위한 연구 방향 중의 하나는 지리적 정보를 이용하는 것이다. 대표적인 메커니즘인 Geo for Now[1]은 지리적 위치 정보를 기반으로 주소를 할당하고 멀티호밍 제공 시 DFZ내의 글로벌 라우팅 테이블 엔트리가 급격히 증가되는 문제점을 해결하기 위한 방안을 제공한다. 그러나 [1]은 멀티호밍을 위하여 반드시 새로운 주소가 할당되어야 하며 멀티호밍 서비스를 요구하는 사이트가 증가되는 경우 확장성 문제를 야기한다. 본 논문에서는 지리적 위치 정보를 기반으로 IPv4 형식의 멀티호밍 기법을 그대로 적용하는 동시에 확장성 문제를 해결하기 위한 메커니즘을 제안한다. 제안된 메커니즘의 경우 지리적 위치 정보 및 확장된 BGP 속성의 사용으로 멀티호밍으로 인해 야기되는 상세한 경로 정보의 확산을 제한한다. 이로써 확장성의 문제를 발생시키지 않으면서도 IPv4 형식의 멀티호밍 기법을 사용함으로써 IPv4 멀티호밍에서 제공하던 기능들을 유사한 수준으로 제공할 수 있다.