• 제목/요약/키워드: 6-AN

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의인성 쇄골하 동맥류 수술 치험 1례 (Iatrogenic Subclavian Artery Aneurysm: Report of a Case)

  • 오중환;박승일;원준호
    • Journal of Chest Surgery
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    • 제32권8호
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    • pp.753-756
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    • 1999
  • 쇄골하 동맥류는 희귀한 질환이며 파열의 위험성 때문에 외과적 수술이 필요하다. 43세 남자 환자가 쇄골 하 정맥 도관삽관술을 시행받고 우측 상지의 지각 저하와 동통을 주소로 내원하였다. 혈관 조영술 시행 결 과 쇄골하 정맥 도관삽관술후에 생긴 의인성 쇄골하 동맥류 진단하에 수술을 시행하였다. 6$\times$7 cm 정도의 동맥류 제거 후 6 mm Gore Tex 인조혈관으로 문합을 시행하였다. 술 후 환자는 특별한 합병증 없이 퇴원하 였으며 술 후 3개월 현재 외래를 통해 추적 관찰 중이다.

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Analysis of a NEMO enabled PMIPv6 based Mobility Support for an Efficient Information Transmission

  • Caytiles, Ronnie D.;Park, Byungjoo
    • International journal of advanced smart convergence
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    • 제7권4호
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    • pp.197-205
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    • 2018
  • Nowadays, wireless sensor networks (WSNs) have been widely adopted in structural health monitoring (SHM) systems for social overhead capital (SOC) public infrastructures. Structural health information, environmental disturbances and sudden changes of weather conditions, damage detections, and external load quantizing are among the capabilities required of SHM systems. These information requires an efficient transmission with which an efficient mobility management support for wireless networks can provide. This paper deals with the analysis of mobility management schemes in order to address the real-time requirement of data traffic delivery for critical SHM information. The host-based and network-based mobility management protocols have been identified and the advantages of network mobility (NEMO) enabled Proxy Mobile Internet Protocol version 6 (PMIPv6) have been leveraged in order to address the SHM information transmission needs. The scheme allows an efficient information transmission as it improves the handover performance due to shortened handover latency as well as reduced signaling overhead.

HMIPv6에서 핸드오버 지연 및 패킷 손실 감소를 위한 2차 MAP 이용 기법 (A Secondary MAP Scheme for Decreasing a Handover Delay and Packet Loss in an HMIPv6)

  • 장성식;이원열;박선영;변태영;한기준
    • 대한전자공학회논문지TC
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    • 제42권2호
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    • pp.39-48
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    • 2005
  • Mobile IP 망의 핸드오버 지연 및 부하 감소를 위해 HMIPv6에서는 MAP을 이용하여 지역 이동성 제어 기능을 제공한다. 이동단말이 방문 망에 진입 시 새로운 MAP을 결정하는데 기존의 HMIPv6에서는 가장 먼 거리의 MAP을 우선적으로 선택하는 거리 기반 알고리즘을 사용한다. 이 방식은 소극적인 이동을 하는 단말도 가장 먼 거리의 MAP을 선택하게 하여 핸드오버 지연과 패킷 은실이 증가한다는 문제를 가지고 있다. 본 논문에서는 기존의 거리 기반 알고리즘에 의해 선택되는 기본 MAP 외에 2차 MAP을 이용하여 이러한 문제를 해결하는 새로운 기법을 제안하였다. 본 논문에서 제안한 새로운 기법과 기존의 HMIPv6 기법에서의 핸드오버 시 지연시간과 패킷 손실률에 대하여 성능 비교를 하여 본 논문에서 제안한 2차 MAP 이용 기법의 우수함을 증명하였다.

엑스선용 평행빔 광학소자 개발 및 평가 (Development and Evaluation of Parallel Beam Optic for X-ray)

  • 박병훈;조형욱;천권수
    • 한국방사선학회논문지
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    • 제6권6호
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    • pp.477-481
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    • 2012
  • 엑스선 회절분석기는 비파괴적인 방법으로 시료의 정보를 정성 및 정량적으로 분석할 수 있다. 엑스선 회절분석기에는 다양한 광학소자가 사용된다. 평행빔 광학소자는 광축에 평행한 빔을 통과시키고 발산하는 빔을 제거하는 역할을 한다. 와이어 컷 제작과 스테인리스 스틸 평판을 연마하여 평행빔 광학소자를 제작하였고 엑스선 영상장치를 이용하여 그 평행도를 평가하였다. 설계된 6 mrad과 매우 가까운 6.6 mrad의 평행도를 갖는 평행빔 광학소자를 제작하였다. 엑스선 영상을 이용하면 개개의 평판의 평행도를 예측할 수 있을 뿐만 아니라 다양한 광학소자 평가에도 사용될 수 있을 것이다.

Leveraging Proxy Mobile IPv6 with SDN

  • Raza, Syed M.;Kim, Dongsoo S.;Shin, DongRyeol;Choo, Hyunseung
    • Journal of Communications and Networks
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    • 제18권3호
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    • pp.460-475
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    • 2016
  • The existing Proxy Mobile IPv6 suffers from a long handover latency which in turn causes significant packet loss that is unacceptable for seamless realtime services such as multimedia streaming. This paper proposes an OpenFlow-enabled proxy mobile IPv6 (OF-PMIPv6) in which the control of access gateways is centralized at an OpenFlow controller of a foreign network. The proposed OF-PMIPv6 separates the control path from the data path by performing the mobility control at the controller, whereas the data path remains direct between a mobile access gateway and a local mobility anchor in an IP tunnel form. A group of simple OpenFlow-enabled access gateways performs link-layer control and monitoring activities to support a comprehensive mobility of mobile nodes, and communicates with the controller through the standard OpenFlow protocol. The controller performs network-layer mobility control on behalf of mobile access gateways and communicates with the local mobility anchor in the Proxy Mobile IPv6 domain. Benefiting from the centralized view and information, the controller caches the authentication and configuration information and reuses it to significantly reduce the handover latency. An analytical analysis of the proposed OF-PMIPv6 reactive and proactive handover schemes shows 43% and 121% reduction in the handover latency, respectively, for highly utilized network. The results gathered from the OF-PMIPv6 testbed suggest similar performance improvements.

Adverse effect of IL-6 on the in vitro maturation of porcine oocytes

  • Yi, Young-Joo;Adikari, Adikari Arachchige Dilki Indrachapa;Moon, Seung-Tae;Heo, Jung-Min;Lee, Sang-Myeong
    • 농업과학연구
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    • 제48권3호
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    • pp.607-615
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    • 2021
  • Cytokines are protein mediators that possess the ability to assist cell-to-cell communication in immune system-related activities. In general, pathogen endotoxins activate the release of inflammatory mediators, and with time, there is an increase in the cytokine levels in the body. Interleukin (IL)-6 mediates the acute-phase inflammatory response, and elevated IL-6 levels have been reported in peritoneal fluids of women with pelvic inflammation and endometriosis, thereby associating it with oocyte quality and infertility. To overcome subfertility or infertility in humans and animals, the present study was done to examine the effect of recombinant IL-6 on porcine oocytes matured in vitro and subsequently to determine the fertilization rate and embryo development. Porcine oocytes were incubated with varying concentrations of IL-6 (0 - 2 ㎍·mL-1) for 44 h followed by in vitro fertilization and culturing of the oocytes. The oocytes or embryos were fixed with 3.7% paraformaldehyde (PFA) and stained with fluorescence dyes, and the meiotic spindle, chromosome organization, fertilization status and embryo development were subsequently assessed under a fluorescence microscope. We observed induction of an abnormal meiotic spindle alignment in the oocytes incubated with IL-6 compared to the control oocytes incubated without IL-6. Moreover, significantly decreased fertilization rates and embryo development were observed for oocytes incubated with IL-6 (p < 0.05). Thus, an increased IL-6 level during oocyte maturation could be associated with fertilization failure due to an aberrant chromosomal alignment and a disruption of the cortical granules. Taken together, our results indicate that successful assisted reproduction can be achieved by controlling the levels of inflammatory cytokines.

NADP+-Dependent Dehydrogenase SCO3486 and Cycloisomerase SCO3480: Key Enzymes for 3,6-Anhydro-ʟ-Galactose Catabolism in Streptomyces coelicolor A3(2)

  • Tsevelkhorloo, Maral;Kim, Sang Hoon;Kang, Dae-Kyung;Lee, Chang-Ro;Hong, Soon-Kwang
    • Journal of Microbiology and Biotechnology
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    • 제31권5호
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    • pp.756-763
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    • 2021
  • Agarose is a linear polysaccharide composed of ᴅ-galactose and 3,6-anhydro-ʟ-galactose (AHG). It is a major component of the red algal cell wall and is gaining attention as an abundant marine biomass. However, the inability to ferment AHG is considered an obstacle in the large-scale use of agarose and could be addressed by understanding AHG catabolism in agarolytic microorganisms. Since AHG catabolism was uniquely confirmed in Vibrio sp. EJY3, a gram-negative marine bacterial species, we investigated AHG metabolism in Streptomyces coelicolor A3(2), an agarolytic gram-positive soil bacterium. Based on genomic data, the SCO3486 protein (492 amino acids) and the SCO3480 protein (361 amino acids) of S. coelicolor A3(2) showed identity with H2IFE7.1 (40% identity) encoding AHG dehydrogenase and H2IFX0.1 (42% identity) encoding 3,6-anhydro-ʟ-galactonate cycloisomerase, respectively, which are involved in the initial catabolism of AHG in Vibrio sp. EJY3. Thin layer chromatography and mass spectrometry of the bioconversion products catalyzed by recombinant SCO3486 and SCO3480 proteins, revealed that SCO3486 is an AHG dehydrogenase that oxidizes AHG to 3,6-anhydro-ʟ-galactonate, and SCO3480 is a 3,6-anhydro-ʟ-galactonate cycloisomerase that converts 3,6-anhydro-ʟ-galactonate to 2-keto-3-deoxygalactonate. SCO3486 showed maximum activity at pH 6.0 at 50℃, increased activity in the presence of iron ions, and activity against various aldehyde substrates, which is quite distinct from AHG-specific H2IFE7.1 in Vibrio sp. EJY3. Therefore, the catabolic pathway of AHG seems to be similar in most agar-degrading microorganisms, but the enzymes involved appear to be very diverse.

소방활동을 위한 밀폐공간 무선통신 측위성능 평가 (The Evaluation of UWB Wireless Communication Position Determination Function in an Enclosed Space for Fire Fighting)

  • 김동현;김충일
    • 한국화재소방학회논문지
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    • 제31권5호
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    • pp.117-122
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    • 2017
  • 밀폐된 공간에서 통신인프라가 파괴될 경우, 긴급 유 무선 통신환경을 구축하여 화재진압 및 소방관 위치확인을 통한 보다 안전한 재난대응환경 확보가 필요하다. 본 연구에서는 Ultra-Wide Band (UWB) 무선통신망을 이용하여 밀폐된 실내 통신환경을 구축하기 위해 6가지 실내환경에 대해 단일 UWB 통신모듈에 대한 통신측위 성능평가를 최대 20 m까지 측정하였다. UWB 통신주파수 각 대역별 6개 채널에 대한 실내환경 통신거리 측정 결과, 개방공간(평균 15.5 m, 최대 20 m), 복도(평균 17.33 m, 최대 20 m), 실내집기류 존치 실내(평균 15.3 m, 최대 20 m), 수직계단(평균 4.33 m, 최대 6 m), 방화문 폐쇄 수평공간(평균 6.5 m, 최대 17 m)으로 나타났다. 이중 7번 채널인 6489.6~1081.6 MHz 주파수 대역에서 통신성능과 거리성능이 가장 우수한 것으로 나타났다. 이에 UWB 통신모듈을 20m 간격으로 설치하고 멀티채널을 이용할 경우 밀폐공간에서 통신환경 구축이 가능한 것으로 판단된다.

Relationship between the infrastructure level of the 6th industrialization and its outlook

  • Kim, Sounghun;Han, Jae Hwan
    • 농업과학연구
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    • 제44권4호
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    • pp.613-619
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    • 2017
  • In Korea, the government introduced the $6^{th}$ industrialization policy for the agricultural sector in 2013, to increase farmers' incomes and the value-added of agricultural products. Although some research has been done on the $6^{th}$ industrialization of agriculture, the relationship between the level of consumers' awareness and the $6^{th}$ industrialization of agriculture has not yet been discussed. The purpose of this paper is to analyze the effect of consumers' awareness levels on the development of the $6^{th}$ industrialization of agriculture. The results of a survey and seemingly unrelated bivariate probit model present the following findings: an increased consumers' awareness of the $6^{th}$ industrialization of agriculture positively affects the agricultural sector. More particularly, it was found that consumers who agree that the $6^{th}$ industrialization increases farmers' income and creates value-added agricultural products will also have an optimistic prospect for a successful $6^{th}$ industrialization. In addition, consumers who like to experience agro-tourism type activities give higher scores to the infrastructure level of the $6^{th}$ industrialization. Consumers who think that production section should take lead the $6^{th}$ industrialization of the agricultural sector will also have an optimistic prospect for a successful $6^{th}$ industrialization. However, consumers who think that farmers or farmers' organizations, should take lead the $6^{th}$ industrialization have a more pessimistic prospect for a successful $6^{th}$ industrialization. Consumers who got information on the $6^{th}$ industrialization from the internet think that the infrastructure of the $6^{th}$ industrialization is not good enough.

윈도우 NT 커널 환경에서 IPv6 프로토콜 구현 연구 (An Implementation of Internet Protocol Version 6 o Windows NT Kernel Environment)

  • 강신각;김대영
    • 한국정보처리학회논문지
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    • 제4권10호
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    • pp.2521-2532
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    • 1997
  • 월드 와이드 웹(WWW)과 MBone 응용 등의 출현으로 인터넷 이용자가 급속히 증가되면서 인터넷 주소 공간의 확장과 멀티미디어 응용을 지원할 수 있도록 기존 인터넷 프로토콜의 개선이 요구됨에 따라 IETF에서는 차세대 인터넷 망 계층 프로토콜로써 IPv6를 개발하였다. 이 논문에서는 IPv6 프로토콜을 Windows NT의 커널 내부에 프로토콜 드라이버로 구현한 내용을 기술하고 있다. 본 연구에서는 IPv6 호스트로 동작되기 위해 필수적으로 요구되는 IPv6 헤더 처리기능, IPv6 주소처리기능, 제어메세지 처리기능, 그룹관리 메세지 처리기능, 이웃탐색 기능이 구현 및 시험되었다. 구현된 IPv6 프로토콜 드라이버 모듈은 하부 통신망 접속 카드와 표준 인터페이스인 NDIS를 통해 접속되며, 디스패치 함수화 Lower-Edge 함수를 이용하여 커널 내부에서 동작하는 드라이버 모듈을 상위 사용자 응용 및 하부 NDIS와 접속시키는 형태로 구현하였다. 구현된 IPv6 프로토콜 드라이버는 커널 모드에서 구현됨으로써 향상된 성능을 제공하며, 다이나믹 링크 라이브러리 형태로 사용자 인터페이스를 제공하므로 응용 프로그램 개발자들이 손쉽게 사용할 수 있도록 하였다.

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