• 대한통합의학회지
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• 제12권3호
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• pp.237-247
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• 2024

Purpose : This study aimed to systematically review the effectiveness of nursing interventions for patients receiving extracorporeal membrane oxygenation (ECMO). As the use of ECMO increases in critical care settings, it is important to understand how nursing interventions affect patient outcomes, survival, and complication rates. Methods : This systematic review followed the preferred reporting items for systematic reviews and meta-analysis guidelines. A literature search was performed using terms related to ECMO and nursing interventions in several international electronic databases including CINAHL, Embase, MEDLINE, and Web of Science. Studies were screened and selected according to predefined eligibility criteria, focusing on those that evaluated the impact of nursing interventions on adult. Data extraction and risk-of-bias assessment were independently performed by two researchers. Results : A total of 647 studies were identified, and seven met the inclusion criteria for qualitative analysis. The included studies demonstrated that high-quality nursing care significantly improves clinical outcomes and reduces complications in patients receiving ECMO. Effective nursing interventions included prone positioning combined with ECMO for patients with acute respiratory distress syndrome, meticulous infection control, comprehensive and continuous nursing protocols, skilled nursing, and multidisciplinary management. These interventions have been shown to improve oxygenation, reduce complications, such as bleeding, manage blood pressure, and enhance overall clinical outcomes. Conclusion : High-quality nursing interventions are critical to improve survival and reduce complications in patients receiving ECMO. Implementing a multidisciplinary approach and comprehensive nursing protocols, including infection control and psychological support, is essential for the effective management of these patients. The findings of this study provide a foundation for the development of practical guidelines and educational programs to improve the quality of care for patients undergoing ECMO, ultimately enhancing the effectiveness of ECMO treatment and patient outcomes.

• Tuberculosis and Respiratory Diseases
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• 제73권5호
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• pp.266-272
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• 2012

Background: Limited data on the incidence and clinical characteristics of adult pertussis infections are available in Korea. Methods: Thirty-one hospitals and the Korean Centers for Disease Control and Prevention collaborated to investigate the incidence and clinical characteristics of pertussis infections among adults with a bothersome cough in non-outbreak, ordinary outpatient settings. Nasopharyngeal aspirates or nasopharyngeal swabs were collected for polymerase chain reaction (PCR) and culture tests. Results: The study enrolled 934 patients between September 2009 and April 2011. Five patients were diagnosed as confirmed cases, satisfying both clinical and laboratory criteria (five positive PCR and one concurrent positive culture). Among 607 patients with cough duration of at least 2 weeks, 504 satisfied the clinical criteria of the US Centers for Disease Control and Prevention (i.e., probable case). The clinical pertussis cases (i.e., both probable and confirmed cases) had a wide age distribution ($45.7{\pm}15.5$ years) and cough duration (median, 30 days; interquartile range, 18.0~50.0 days). In addition, sputum, rhinorrhea, and myalgia were less common and dyspnea was more common in the clinical cases, compared to the others (p=0.037, p=0.006, p=0.005, and p=0.030, respectively). Conclusion: The positive rate of pertussis infection may be low in non-outbreak, ordinary clinical settings if a PCR-based method is used. However, further prospective, well-designed, multicenter studies are needed.

• Geomechanics and Engineering
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• 제16권2호
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• pp.205-215
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• 2018

Strain-based criteria are known as a direct method in determining the stability of the geomechanical structures. In spite of the widely use of Sakurai critical strain criterion, it is so conservative to make use of them in rocks with initial plastic deformation on account of the considerable difference between the failure and critical strains. In this study, a new criterion has been developed on the basis of the failure strain to attain more reasonable results in determining the stability status of the tunnels excavated in the rocks mostly characterized by plastic-elastic/plastic behavior. Firstly, the stress-strain curve was obtained having conducted uniaxial compression strength tests on 91 samples of eight rock types. Then, the initial plastic deformation was omitted making use of axis translation technique and the criterion was presented allowing for the modified secant modulus and by use of the failure strain. The results depicted that the use of failure strain criterion in such rocks not only decreases the conservativeness of the critical strain criterion up to 42%, but also it determines the stability status of the tunnel more accurately.

• 대한기계학회논문집
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• 제10권2호
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• pp.198-207
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• 1986

본 연구에서는 Fig.1과 같이 시편 부위에 균일응력분포가 작용하도록 M.Arcan 등에 의해 제시된 비대칭형상의 시편고정물에 층간균열을 가진 시편을 부착한 다음 하중각도를 바꾸어가며 모우드 II뿐 아니라 혼합모우드 및 모우드 I까지도 실험 할 수 있는 실험장치를 사용하여 균열면에서의 섬유방향이 〔0/0〕이고 초기균열길이비가 0.4, 0.5, 0.6인 시편의 모우드I, 혼합모우드 및 모우드II 층간파괴인 성치들을 실험 적으로 구해 혼합모우드 파괴결정조건식들에 적용시켜 보았다. 또한 균열면에서의 섬유방향이 〔0/0〕, 〔0/30〕, 〔0/45〕및 〔0/60〕인 경우의 층간파괴인성치와 이때 의 파괴현상에 대해 관찰하였다.

• 한국가스학회지
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• 제24권1호
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• pp.56-65
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• 2020

일반적으로 화재는 다양한 원인으로 발생하며 무작위로 보이기에 화재의 발생을 예측한다는 것은 매우 도전적인 문제이다. 하지만 모든 화재가 아닌 큰 피해를 주는 초대형 화재사고의 예측이 가능하다면, 선제적 대응을 통한 손실 최소화를 기대할 수 있다. 본 연구에서는 국가 전체를 대상으로 초대형 화재사고를 예측하기 위해 기계학습 기법인 k-평균 클러스터링을 이용하여 화재사고를 분류하고, 이를 인위적인 설정이 강한 비전문가 기준, 전문가 기준 분류 결과와 비교하여 예측에 적절한 분류 기준을 제안하였다. 비교 결과 기계학습을 이용한 분류가 일정한 피해규모와 비율로 분류되어, 예측에 적절한 분류 기준이라 판단하였다. 또한 초대형 화재사고의 주기성을 분석한 결과 일정한 패턴을 보였지만 높은 편차를 보였다. 따라서 단순 예측기법이 아닌 고급 예측기법을 사용하였을 때 초대형 화재사고의 발생 예측이 가능하다고 판단되었다.

• Structural Engineering and Mechanics
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• 제91권3호
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• pp.301-313
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• 2024

Plastic buckling of tubular columns has been attributed to rotational instability of plastic hinges. The present study aimed to characterize the plastic hinges for two different grades of strain-hardening, examined in mild-steel (MS) and stainless-teel (SS) tubes with un-strengthened and strengthened conditions. At the primary stage, the formerly tested experimental specimens were simulated using full-scale FE models considering nonlinear response of the materials, then to estimate the characteristics of the plastic hinges, a meso model was developed from the critical region of the tubes and the moment-rotation diagrams were depicted under pure bending conditions. By comparison of the relative rotation diagram obtained by the full-scale models with the critical rotation under pure bending, the length and critical rotation of the plastic hinges under eccentric axial load were estimated. The stress and displacement diagrams indicated the mechanism of higher energy absorption in the strengthened tubes, compared to unstrengthened specimens, due to establishment of stable wrinkles along the tubes. The meso model showed that by increasing the critical rotation in the strengthened MS tube equal to 1450%, the energy absorption of the tube has been enhanced to 2100%, prior to collapse.

• 한국도서관정보학회지
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• 제30권1호
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• pp.151-169
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• 1999

인터넷은 질적으로 통제되지 않는 가치없는 정보의 증가, 신뢰성의 저하, 비체계적이고 무조직적인 정보자원의 확산이라는 심각한 문제점을 안고 있다. 본고에서는 인터넷 정보자원의 일반적인 평가기준을 근거로 하여, 내용적인 측면에 초점을 맞추어 저작성, 발행기관 관점/선입관, 학문적 지식, 정확성/실증 및 최신성 그리고 웹사이트 문서의 기본요소의 일곱 가지의 항목을 설정하여 사용자 개개인의 입장에서 인터넷상의 웹사이트에 수록되어 있는 문서들을 탐색하여 이용할 경우 해당 문서의 평가에 적용될 수 있는 기준 및 방법을 제시하였다.

• 한국환경생태학회지
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• 제8권1호
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• pp.1-10
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• 1994

본 논문에서는 현행 우리나라의 희귀 및 멸종위기식물의 평가에 관한 몇 가지 문제점을 살피고, 이러한 문제점의 제시와 함께, 최근 I. U. C. N. 의 S. S. C. 에서 시안을 작성 중인 희귀 및 멸종위기식물에 대한 새로운 분류안에 대한 내용을 소개하였다. 본 시안에 의하면 멸종종, 자생지 멸종종. 멸종위기종, 위기종, 취약종, 민감종, 안전/저위험종, 자료 불충분종 및 미평가종 등 모두 9개 분류군으로 구분되어 있다. 본 시안이 더욱 다듬어지고 공식화되기 위해서는 앞으로 얼마간의 기간이 소요되리라 판단되며, 이 같은 움직임을 염두에 두고, 앞으로 우리나라의 희귀 및 멸종위기식물에 대하여 보다 구체적인 평가기준의 작성에 대해 관심을 가져야 할 것으로 믿는다. 아울러 새로이 도입된 몇 가지 용어의 우리말 번역에 대해서도 앞으로 충분한 검토를 거친 후에 통일을 기하는 것이 필요하다고 판단된다.

• 한국정보시스템학회지:정보시스템연구
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• 제14권2호
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• pp.215-236
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• 2005

The purpose of this paper is to examine the differences in the critical success factors for ERP adoption suggested by the system managers and the ERP consultants. The survey results indicated the following findings. First, there was no significant difference in the relative importance of the critical success factors between the system managers and the ERP consultants. Both groups agree that 'top manager's concern and support' is the most critical factor and that 'user involvement' is the second. However, the system managers tend to think 'training and education of end users' and 'cooperations among the project participants' more important than the consultants do. Second, both groups agree that the most important ERP contribution should be 'improvements in the business processes.' They also agree that the least important aspect is 'ERP's contribution to the individual's productivity.' In overall, the ordered lists of ERP evaluation criteria according to their importances were of no significant difference between the groups. Third the two groups showed differences when they were asked to evaluate the importance of the critical success factors for each of the ERP evaluation criterion. In general, the system managers tend to put more emphasis on 'training and education of end users' and 'adaptation of end users to the changed processes,' whereas the consultants tend to emphasize more on 'top managers' interest and supports' and 'project manager's capabilities and performance.' The differences in the critical success factors presented by the two groups indicated that more efforts need to be devoted to understanding other participant's interests and concerns in an ERP project team. Better coordinations based on the mutual understandings could improve the chance of achieving a success in adopting ERP packages.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 춘계학술대회논문집
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• pp.319-324
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• 2003

In general industrial rotating machinery is operated under 3,600 rpm as rotating speed and designed to have critical speed that is above operating speed. So, there was no problem to operate rotating machine under critical speed. But nowadays, they should be operated more than the frist critical speed as usual with the trend of high speed, large scale and hish precision in industries. In case of the large rotor assembly as the trend of large scale, using fitting method of disk or cylinder on shaft is rising for the convenience of assembly and cutting down of manufacturing cost. The shrink fitting is used to assemble lamination part on shaft for manufacturing of rotor of motor or generator in many cases and also is widely used for other machinery. In rotating system, which is compose of rotor and bearing, the critical speed is determined from inertia and stiffness for the rotor and bearings. In case of fitting assembly, analysis and design of the rotor is not easy because the rotor stiffness is determined depend on a lot of factors such as shaft material/dimension, disk material/dimension and assembled interference etc. Therefore designer who makes a plan for hish-speed rotating machine should design that the critical speed is located out of operating range, as dangerous factors exist in it. In order to appropriate design, an accurate estimation of stiffness and damping is very important. The stiffness variation depend on fitting interference is a factor that changes critical speed and if it's possible to estimate it, that Is very useful to design rotor-bearing system. In this paper, the natural frequency variation of the rotor depends on fitting interference between basic shaft and cylinder is examined by experimentation. From the result, their correlation is evaluated quantitatively using numerical analysis that is introduced equivalent diameter end the calculation criteria is presented for designer who design fitting assembly to apply with ease for determination of appropriate interference.