• 동의생리병리학회지
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• 제22권6호
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• pp.1621-1625
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• 2008

Generally, hiccup is a temporary symptom, however, persistent or intractable hiccup that repeats continuously or does not respond to medical treatments makes the patients very painful. In this case, a seventy-two years old patient with pontine infarction showed symptoms as aspiration pneumonia and persistent hiccup a few days after hospitalized. We considered him as excess heat pattern and prescribed Yangkyuk-san. In the result, not only the frequency and intensity of hiccup were remarkably decreased but also the inflammation and overall symptoms by pontine infarction were improved.

• 한국문헌정보학회지
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• 제38권1호
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• pp.13-34
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• 2004

보다 효과적으로 디지털 아카이브를 구축하고 디지털 아카이브간의 상호운영과 자원의 공용을 수월하게 수행할 수 있도록 하는 표준적인 아카이브 모형과 이에 따른 정책 및 방법을 제안하는 OAIS 참조모형이 권고되었다. OAIS 참조 모형은 개념적으로 최상위 차원에서 정의한 것으로 현재 개발된 디지털 아카이브는 적용시키려는 모 기관의 목적, 시스템 환경 및 제반환경과 같은 다양한 요소들을 고려하여 개발되고 있다. 이에 현재 구축되어진 디지털 아카이브 아키텍처를 조사하여 앞으로 구축될 디지털 아카이브가 갖추어야 할 지녀야 할 기술적 전략을 제시하였다. 이 결과를 토대로 하여 본 연구는 OAIS 참조모형이 권고한 기본개념과 기능, 환경을 근간으로 하나 보다 신뢰성과 보안성이 높고 정보기술 관리기능이 영구적으로 유지될 수 있는 디지털 아카이브의 개념적 모형을 제시하였다.

• 대한수의학회지
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• 제41권4호
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• pp.523-528
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• 2001

칠면조에서 avian pneumovirus(APV)의 지속감염성 여부를 조사하였다. 칠면조에 APV를 감염시킨 후 4일, 3주, 6주, 9주 후에 건강한 칠면조와 합사하였다. 감염 3주 후에 합사한 건강한 칠면조에서 10일까지 2수에서 APV 유전자를 검출할 수 있었다. 또한 감염 6주 후에 합사한 경우에서도 5일까지 RT-PCR법으로 유전자를 검출할 수 있었다. 그 이후로는 감염칠면조에서 건강한 동물로 전파되었거나 지속감염을 관찰할 수 없었다. APV는 감염 후 6주까지 지속적인 감염을 통해 건강한 동물에게 질병을 전파시킬 수 있다.

• Investigative Magnetic Resonance Imaging
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• 제10권2호
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• pp.117-120
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• 2006

위축뇌탈출증(atrectic cephalocele)은 중앙의 두피하부에 있는 피부로 덮힌 병변으로서 수막과 아교세포나 중추신경계 조직의 잔유물들을 포함한다. 수직동이 없거나 잔유물로 남아있는 경우 낫형동(falcin sinus)이 다시 관류하게 되어 정맥의 배출이 가능하게 된다. 위축된 뇌탈출증 또는 지속적인 낫형동은 소아에서 주로 기술되어 왔으며, 성인에서는 매우 드문 병변이다. 저자들은 성인에서 자연퇴화된 위축뇌탈출증이 지속적인 낫형동을 동반한 매우 드문증례를 보고하고자 하며 MR영상과 MR정맥조영술은 정확한 해부학적 묘사와 진단에 유용하였다.

• 한국통신학회논문지
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• 제21권5호
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• pp.1208-1220
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• 1996

본 논문에서는 IEEE 802.11에서 채택한 매체접근제어 프로토콜인 Stop-and-Wait Automatic Repeat reQust(ARQ)방식을 사용하는 Carrier Sence Multiple Access/Collision Avoidance(CSMA/CA) 프로토콜의 성능을 renewal theory를 사용하여 수학적으로 분석하였으며, 컴퓨터 시뮬레이션을 사용하여 분석의 신뢰성을 검증하였다. CSMA/CA 프로토콜의 처리율을 분석하기 위하여 통신망은 유한 가입자로 구성되며, 슬롯화된 채널을 고려하였고, CSMA/CA프로토콜은 1-persistent CSMA와 p-persistent CSMA프로토콜을 혼합한 프로토콜로 모델링하여 CSMA.CA 프로토콜의 처리율 및 패킷지연을 분석하였다. 분석 결과에 의하면, CSMA/CA 방식은 스테이션의 수, Acknowledgement(ACK) 패킷의 길이 및 Distributed coordination function Inter Frame Space(DIFS)의 길이가 커짐에 따라 처리율이 저하되었으며, 패킷 지연이 증가하였다.

• Molecules and Cells
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• 제37권7호
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• pp.518-525
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• 2014

Gammaherpesvirus (${\gamma}HV$) infection of the central nervous system (CNS) has been implicated in diverse neurological diseases, and murine ${\gamma}HV$-68 (MHV-68) is known to persist in the brain after cerebral infection. The underlying molecular mechanisms of persistency of virus in the brain are poorly understood. Here, we characterized a unique pattern of MHV-68 persistent infection in neuroblastoma cells. On infection with MHV-68, both murine and human neuroblastoma cells expressed viral lytic proteins and produced virions. However, the infected cells survived productive infection and could be cultured for multiple passages without affecting their cellular growth. Latent infection as well as productive replication was established in these prolonged cultures, and lytic replication was further increased by treatment with lytic inducers. Our results provide a novel system to study persistent infection of ${\gamma}HVs$ in vitro following de novo infection and suggest application of MHV-68 as a potential gene transfer vector to the brain.

• 한국초전도ㆍ저온공학회논문지
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• 제15권4호
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• pp.44-47
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• 2013

We had proposed a winding method so called "Wind-and-Flip", which enables a persistent current operation of an HTS pancake coil without any electrical joint. In order to improve the magnetic field drift characteristics, a prototype HTS coil with the technique was fabricated, and tested under various temperatures. Because the coil doesn't have any electric terminals for current leads, an HTS background magnet was used to induce the persistent current in the coil by field cooling process. A conduction cooling system with a GM cryocooler was prepared to keep the operating temperatures of the prototype coil much below the 77 K. We investigated the magnetic field drift characteristics under the various operating temperatures by measuring the center magnetic field with a cryogenic Hall sensor. The persistent current mode operation at 20 ~ 50K showed a strong possibility of the winding technique for the application such as MRI or NMR.

• 대한간호학회지
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• 제50권2호
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• pp.159-177
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• 2020

Purpose: This study aimed at identifying factors related to persistent postoperative pain after cardiac surgery and estimating their effect sizes. Methods: The literature search and selection was conducted in four different databases (CINAHL, Cochrane Library, PubMed, and PQDT) using the Preferred Reporting Items for Systematic Review and Meta-Analysis Statement. A total of 14 studies met the inclusion criteria and were systematically reviewed. For the meta-analysis, R was used to analyze 30 effect sizes of for both individual and operative factors as well as publication biases from a total of nine studies. Results: The meta-analysis revealed that persistent postoperative pain after cardiac surgery was related to one individual factor (gender) and two operative factors (acute postoperative pain and use of the internal mammary artery). Operative factors (OR=5.26) had a larger effect size than individual factors (OR=1.53). Conclusion: Female gender, acute pain after surgery, and use of the internal mammary artery are related factors to persistent postoperative pain. The development of interventions focusing on modifiable related factors, such as acute postoperative pain, may help to minimize or prevent PPP after cardiac surgery.

• 대한수의학회지
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• 제47권2호
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• pp.163-167
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• 2007

Bovine viral diarrhea (BVD) is very important disease in cattle industry with a worldwide distribution. Detection and elimination of persistently infected calves with bovine viral diarrhea virus (BVDV) was valuable strategy for BVD eradication because those calves were main source for transmission. We surveyed persistent infection with BVDV by reverse transcription polymerase chain reaction (RT-PCR) and immunohistochemistry (IHC) using whole blood and skin. Five hundred thirty nine Korean native calves were tested. Four calves (0.7%) were positive for BVDV antigen for both tests. Those calves remained positive for follow-up by RT-PCR and IHC. Therefore they were identified as persistently infected with BVDV. We confirmed that immunohistochemistry using skin biopsy samples was very useful tool to detect persistently infected calves with BVDV. As far as we know, this would be first report on persistent infection with BVDV in Korea.

• 한국재료학회지
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• 제30권8호
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• pp.413-420
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• 2020

Lu₃Al_5-xGa_xO₁₂:Ce³⁺,Cr³⁺ powders are prepared using a solid-state reaction method. To determine the crystal structure, Rietveld refinement is performed. The results indicate that Ga³⁺ ions preferentially occupied tetrahedral rather than octahedral sites. The lattice constant linearly increases, obeying Vegard's law, despite the strong preference of Ga³⁺ for the tetrahedral sites. Increasing x led to a blue-shift of the Ce³⁺ emission band in the green region and a change in the emission intensity. Persistent luminescence is observed from the powders prepared with x = 2-3, occurring through a trapping and detrapping process between Ce³⁺ and Cr³⁺ ions. The longest persistent luminescence is achieved for x = 2; its lifetime is at least 30 min. The findings are explained using crystal structure refinement, crystal field splitting, optical band gap, and electron trapping mechanism.