• 융합보안논문지
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• 제5권1호
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• pp.53-62
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• 2005

virus 방역 체계 관리는 network infra 구조관리, traffic 소통경로관리, 방역 zone 설정, gateway구간 방역관리이다. 본 논문은 일반적인 방역체계 구조의 성격과 취약점을 진단하고 이를 개선할 수 있는 대책으로서 개선된 방역체계를 설계하였다. 또한 설계된 방역체계와 configuration, mechanism하에서는 어느 정도의 개선효과 나타나고 있는지 분석하였다. 개선된 다단계 방역체계 하에서는 gateway 단계에서 불필요한 mail을 걸러줌으로서 server에 주는 부하는 감소하며 virus wall상의 CPU 부하의 감소와 virus 치료율의 상승으로 송신 적체 건수는 감소하고 시스템 process수는 증대하고 있다.

• 한국통신학회논문지
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• 제25권9A호
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• pp.1441-1451
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• 2000

There are two types of protection switching : a) automatic switching and b) forced switching. The switching mechanism is generally realised by OAM functions, therefore, the required OAM information field should be reserved in the PLOAM cells. This paper proposes an unidirectional and a bidirectional protection switching method and potential advantages. The unidirectional protection switching method can be faster than the bidirectional method because the unidirectional method does not require an APS protocol for protection switching. The bidirectional protection switching method uses APS K1 byte and K2 byte, which is included in octets of a PST message through downstream or upstream PLOAM cells, for protection switching. As making comparisons between the unidirectional and the bidirectional protection. switching method, this paper proposes an effective constructing method for ATM-PON network.

• JSTS:Journal of Semiconductor Technology and Science
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• 제17권3호
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• pp.401-410
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• 2017

In this work, we show that the excessive lattice heating problem due to parasitic pnp transistor action in the diode electrostatic discharge (ESD) protection device in the diode input protection circuit, which is favorably used in CMOS RF ICs, can be solved by adopting a symmetrical cathode structure. To explain how the recipe works, we construct an equivalent circuit for input human-body model (HBM) test environment of a CMOS chip equipped with the diode protection circuit, and execute mixed-mode transient simulations utilizing a 2-dimensional device simulator. We attempt an in-depth comparison study by varying device structures to suggest valuable design guidelines in designing the protection diodes connected to the $V_{DD}$ and $V_{SS}$ buses. Even though this work is based on mixed-mode simulations utilizing device and circuit simulators, the analysis given in this work clearly explain the mechanism involved, which cannot be done by measurements.

• 전기학회논문지
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• 제60권8호
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• pp.1485-1491
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• 2011

This paper deals with the technical problems for the protection devices, by simulating test facilities of protection coordination for Photovoltaic systems. In order to analyze the operation characteristics for the protection devices in the case that the Photovoltaic systems with bi-directional power supply are located in the feeder, this paper proposes the test facilities composed of model distribution system, protection device and model Photovoltaic systems. By performing the simulation for operation characteristics for the protection devices based on the test facilities, this paper presents the malfunction mechanism for the protection devices. The test results show that this paper is practical and effective for the technical guideline for the Photovoltaic systems.

• 한국화재소방학회논문지
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• 제25권4호
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• pp.42-47
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• 2011

본 연구에서는 환기 및 소방용 복합댐퍼의 개발을 위한 기초 연구의 일환으로 복합댐퍼의 설계인자에 관한 연구를 수행하였다. 본 연구는 복합댐퍼의 프로세스와 운동 메커니즘, 기구 모델링을 바탕으로 복합댐퍼의 설계 및 해석이론을 제시하였고, 설계 및 해석이론을 바탕으로 한 운동해석 시뮬레이션을 통해 복합댐퍼의 각 요소를 설계할 수 있는 엔지니어링 데이터 구축과 원천기술을 확립하였다. 따라서 본 연구를 통해 환기 및 소방용 복합댐퍼 개발에 폭넓게 응용할 수 있는 결과를 얻었다. 본 연구를 바탕으로 복합댐퍼가 개발되면 환기풍도로부터 유입되는 연기제어와 기술적 대책을 마련할 수 있을 것으로 본다.

• 한국인터넷방송통신학회논문지
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• 제19권1호
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• pp.103-109
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• 2019

자동차 전장 시스템에는 여러 개의 전자 제어 장치에 시간 제약성을 갖는 다수의 응용프로그램들이 탑재되어 안전하게 수행될 수 있는 방법이 제공 되어야 한다. 본 논문은 자동차 전장용 실시간 운영체제 규격인 AUTOSAR에서 실시간성 태스크의 스케줄링시에 각 태스크의 마감시간을 준수할 수 있는 효율적인 스케줄링 기법은 제시하고, 타이밍 보호 메커니즘을 적용하는 방안을 제안한다. 고정 우선 순위나 동적 우선순위 태스크의 유연한 마감 시간 보장하기 위한 동적 비선점 알고리즘과, 오류 발생에 대한 실행 시간 모니터링 가능 위치를 제시하고, AUTOSAR 타임 보호 매커니즘 구현 방안을 제시하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권7호
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• pp.2568-2588
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• 2021

Shared mesh protection (SMP) protects traffic against failures occurring in a working path, as with linear protection, and allows resource sharing of protection paths with different endpoints. The SMP mechanism coordinates multiple protection paths that require shared resources when failures occur on multiple working paths. When multiple failures occur in SMP networks sharing limited resources, activation can fail because some of the resources in the protection path are already in use. In this case, a node confirming that a resource is not available has the option to wait until the resource is available or to withdraw activation of the protection path. In this study, we recognize that the protection switching time and the number of protected services can be different, depending on which option is used for SMP networks. Moreover, we propose a detailed design for the implementation of SMP by considering options and algorithms that are commonly needed for network nodes. A simulation shows the performance of an SMP system implemented with the proposed design and utilizing two options. The results demonstrate that resource utilization can be increased or protection switching time can be shortened depending on the option selected by the network administrator.

• 한국멀티미디어학회논문지
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• 제6권1호
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• pp.128-135
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• 2003

지금까지 분산-큐 이중-버스(DQDB)의 공정성을 위한 제어는 대부분 평형 트래픽, 대칭형 트래픽, 역대칭형 트래픽 같은 특정 트래픽를 대상으로 연구하였다. 본 논문에서는 이러한 특정 트래픽이 아닌 일반적인 트래픽 형태인 클라이언트-서버 트래픽 환경에서 DQDB 네트워크의 대역폭을 모든 스테이션에 공평하게 분배 할 수 있는 효율적인 제어 방식을 제안한다. 제안한 방식은 접근 임계값을 기준으로 서버에게는 APS(Access Protection Scheme)를 적용하고, 클라이언트에게는 접근 임계값만으로 대역 폭 할당을 제어한다. 시뮬레이션을 통하여 다른 방식보다 제안한 방식이 더 우수하다는 것을 확인하였다.

• 한국한의학연구원논문집
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• 제9권1호
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• pp.137-144
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• 2003

The objective on this study was to investigate medicinal protection with KH-19, which was composed of 9 kinds of oriental herbs tonifying the blood, against side effect of chemotherapy in mice and its mechanism through microarray. Not only WBC (white blood cell), and PLT (platelet) as a hematopoiesis toxicity indicator but also spleen weight as an immune toxicity indicator was reduced significantly 7 day after. 5-flurouracil (FU) treatment. However, reduction of WBC, PLT, and spleen weight after 5-FU treatment was significantly recovered by KH-19. For mechanic study on KH-19 action, gene expression in mouse spleen treated 5-FU was compared with gene expression in mouse treated 5-FU and KH-19. The result indicates that 23 genes were increased. in expression level over 2 fold and 41 genes were decreased in expression level more than 2 fold at mouse spleen by KH-19 treatment. KH-19 mechanism may be complicated more than other drug which of mechanism were composed of single compound because KH-19 was composed of various compounds.

• 대한한방내과학회지
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• 제24권1호
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• pp.104-112
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• 2003

Objectives : The purpose of this study is to evaluate the effects of Sohaphyang-won and is to study the mechanism for neuronal death protection in hypoxia with Embryonic day 20(E20) cortical cells of a guinea pig(Sprague Dawley). Methods : E20 cortical cells, used in this investigation were dissociated in Neurobasal media and grown for 14 days in vitro (DIV). On 14 DIV, Sohaphyang-won was added to the culture media for 72 hours. On 17 DIV, cells were given a hypoxic shock and further incubated in normoxia for another three days. On 20 DIV, Sohaphyang-won's effects for neuronal death protection were evaluated by LDH assay and the mechanism was studied by Bcl-2, Bak, Bax, caspase family. Results : This study indicates that Sohaphyang-won's effects for neuronal death protection in hypoxia is confirmed by LDH assay by the method of Embryonic day 20(E20) cortical neuroblast. Conclusions : Sohaphyang-won's mechanism for neuronal death protection in hypoxia restrains inflow of cytochrome C into cellularity caused by Bcl-2 increase and reduces the caspase cascade initiator caspase-10 and the effector caspase-3.