• 콘크리트학회논문집
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• 제19권6호
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• pp.707-715
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• 2007

다공질성 특성을 갖는 콘크리트는 충분한 다짐과 양생 조건에서 장수명을 갖으며, 유해 물질의 주요 경로는 공극이다. 그러나 균열이 발생한 콘크리트의 경우, 균열은 염소이온과 같은 유해 물질의 우선적인 침투 경로가 된다. 균열이 염소에 미치는 영향은 균열폭과 균열 깊이의 크기에 의존한다. 본 연구는 미세균열이 콘크리트의 염소이온 침투에 미치는 영향을 다룬 실험적 연구로서, 연구 목적은 균열폭과 균열 깊이 등의 균열 크기 효과가 염소이온에 미치는 영향을 고찰하는 것이다. 균열을 통한 염소이온의 침투를 시각화 하기 위하여, 급속 염소이온 침투 실험인 RCM (rapid chloride migration) 실험을 수행하였다. 균열폭과 균열 깊이는 전자 현미경으로 관찰하였고, 평균적인 균열폭을 산정하기 위하여 균열 개구 변위가 측정되었다. 다양한 균열 크기에 따른 염소이온의 침투 깊이 및 염소이온 확산계수의 변화율로부터 염소이온이 침투되지 않는 균열 깊이 및 이에 대응한 균열폭이 도출되었다.

• 간호행정학회지
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• 제8권1호
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• pp.123-135
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• 2002

Purpose: In this study, the critical pathway for laparoscopic cholecystectomy patients was developed and applied for clinical study. The effectiveness of the critical pathway was analyzed. Method: The subjects with no critical pathway services of this study were 30 laparoscopic cholecystectomy operation patients, who were hospitalized in B General Hospital in Busan from Nov. 28. 2000 to May 2. 2001. The subjects with critical pathway services of this study were 30 laparoscopic cholecystectomy operation patients, who were hospitalized in B General Hospital in Busan from June. 11. 2001 to Oct. 31. 2001. Results: 1. Development for critical pathway Preliminary critical pathway for the laparoscopic cholecystectomy patients was developed though analysis of the reference and 34 case of medical record. The items on the y-axis were assessment, test, treatment, diet, fluid, consult, medication, activity and education and the items on the x-axis were till 3days after operation. The developed critical pathway was applied in clinical field. 2.　Effectiveness of application on developed critical pathwayPost operational complication was not found in neither the critical pathway using Group nor Non-using Group. Hospitalization period mean was 4.63 days for the using Group and 5.93 days for the Non-using Group(P=.001). The mean cost for medical examination and treatment for the using Group was 786,270 won, 117,454 won(12.9%) less than that of the Non-using Group, 903,724 won(P=.000). The degree of satisfaction for the using group was 3.7 points, for the Non-using Group, 3.15 points. The degree of satisfaction for the used Group was 0.55 points higher than that for the Non-using Group and there was a statistically significant difference(P=.000). Concousion: From results of this study, Using the critical pathway in the laparoscopic cholecystectomy operational patients was effective in decreasing the hospitalization period and cost, and increasing the satisfaction about the medical service.

• 한국자동차공학회논문집
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• 제12권3호
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• pp.109-121
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• 2004

This paper presents an optimal design method for structure-borne durability of a vehicle body structure. Structure-borne durability design requires a new design that can increase fatigue lives of critical areas in a structure and must prohibit transition phenomenon of critical areas that results from modification of the structure at the same time. Therefore, the optimization problem fur structure-borne durability design are consists of an objective function and design constraints of 2 types; type 1-constraint that increases fatigue lives of the critical areas to the required design limits and type 2-constraint that prohibits transition phenomenon of critical areas. The durability design problem is generally dynamic because a designer must consider the dynamic behavior such as fatigue analyses according to the structure modification during the optimal design process. This design scheme, however, requires such high computational cost that the design method cannot be applicable. For the purpose of efficiency of the durability design, we presents a method which carry out the equivalent static design problem instead of the dynamic one. In the proposed method, dynamic design constraints for fatigue life, are replaced to the equivalent static design constraints for stress/strain coefficients. The equivalent static design constraints are computed from static or eigen-value analyses. We carry out an optimal design for structure-borne durability of the newly developed bus and verify the effectiveness of the proposed method by examination of the result.

• 영어어문교육
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• 제15권4호
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• pp.157-175
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• 2009

This paper offers a critical review of a newspaper argument regarding the problems of high school education assessment for university entrance examination system in the United Kingdom. The media account raises three sets of questioning to hold that the nation's long-standing A-levels have failed and is no longer viable as a high-stakes test. However, it is found that the writer's argumentations involving misleading conceptions can be deconstructed because of invalid reasoning and unreliable evidence. So, it is proposed that a reasonable solution to replace the discredited A-level exams should be to adopt an eclectic approach for assessing candidates' multiple capabilities; performance, potentiality and critical thinking skills. These criteria for component-oriented assessments are designed to measure their high school academic achievements and intellectual capacity for tertiary education; in the process of such measurement, critical-logical reasoning abilities for sound judgment and problem-solving tasks should be incorporated with the basic precondition that each university possesses its own discretion for the determination of adequate proportions to reflect each of the assessment outcomes. It is, therefore, expected that this critical review will inspire the readers to understand aspects of assessment as an educational field and to confirm how seriously they may be misguided by a distorted media argumentation without substantive background knowledge.

• Journal of Mechanical Science and Technology
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• 제15권7호
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• pp.921-930
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• 2001

A new theoretical critical heat flux (CHF) model was developed for the forced convective flow boiling at high pressure, high mass velocity, and low quality. The present model for an intermittent vapor blanket was basically derived from the sublayer dryout theory without including any empirical constant. The vapor blanket velocity was estimated by an axial force balance, and the thickness of vapor blanket was determined by a radial force balance for the Marangoni force and lift force. Based on the comparison of the predicted CHF with the experimental data taken from previous studies, the present CHF model showed satisfactory results with reasonable accuracy.

• 영어어문교육
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• 제8권2호
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• pp.55-69
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• 2003

The study was done to find out if there's any correlation between the results of the state-run college entrance examination called "suneung," or college scholastic ability test (CSAT) and the frequency of errors of the medical and nursing students. These two groups of students were subjects for the research. The study was based on the writing of fresh year students who were required to take four-credit-hour English course. These students' writing, particularly their self introduction, was analyzed to see if medical students (the high-scored) made fewer errors on the writing and nursing students (the medium-scored) made more critical errors or vice versa, and furthermore, if the results of the scores had any correlation on the critical errors in writing. The concern of the study was also to explain the attributable factors of the outcome if the high-scored of CSAT actually made fewer errors as well as the types of critical errors made and ways to minimize them.

• Tuberculosis and Respiratory Diseases
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• 제74권4호
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• pp.177-180
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• 2013

We report a 54-year-old woman who presented with a well-defined, homogeneous, and non-enhancing mass in the retrobronchial region of the bronchus intermedius. The patient underwent endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) for histological confirmation. Serous fluid was aspirated by EBUS-TBNA. Cytological examination identified an acellular smear with negative microbiological cultures. The patient was finally diagnosed with bronchogenic cysts by chest computed tomography (CT) and EBUS-TBNA findings. However, 1 week after EBUS-TBNA, the patient developed bronchogenic cyst rupture and pneumonia. Empirical antibiotics were administered, and pneumonia from the bronchogenic cyst rupture had resolved on follow-up chest CT. To our knowledge, this is the first reported case of pneumonia from bronchogenic cyst rupture after EBUS-TBNA.

• 대한수학교육학회지:학교수학
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• 제18권3호
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• pp.503-526
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• 2016

본 연구의 목적은 대입 수리논술고사의 평가요소를 통하여 수리논술고사에 대한 정체성을 규명하고 실제 수리논술고사가 어떻게 출제되고 있는지 살펴보는 것이다. 수리논술고사에 관한 이해를 얻기 위해 2016학년도에 수리논술고사를 실시한 우리나라 25개 대학교 홈페이지에 있는 논술자료집에서 수리논술고사의 평가목표 및 출제방향을 분석하여 수리논술고사의 평가요소를 추출하고, 2015학년도 기출문제를 분석하여 실제 수리논술고사가 어떻게 출제되고 있는지 살펴보았다. 수리논술고사의 평가목표 및 출제방향에 나타난 평가요소는 수학적 지식, 이해력, 논리 비판적 사고력, 문제해결력, 창의력, 표현력, 논증력으로 수리논술고사의 정체성은 이런 능력, 즉 수학적 지식을 포함하는 고차원적인 사고능력과 논술능력을 평가하기 위한 시험이라고 할 수 있다. 또한, 수리논술고사 평가요소에 따라 수리논술 평가기준을 정하고 수리논술고사 기출문제를 분석하였다. 이를 통해 수리논술고사는 평가요소 중 수학적 지식, 이해력, 문제해결력을 요구하는 문제 위주로 출제되고 있음을 알 수 있었다.

• Journal of Trauma and Injury
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• 제25권3호
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• pp.67-71
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• 2012

Purpose: Focused Assessment with Sonography for Trauma (FAST) provides an important initial screening examination in adult trauma patients. However, due to its low sensitivity, FAST is not a replacement for computed tomography (CT) in hemodynamically stable trauma patients. The aim of this study was to determine the test characteristics of FAST in adult, hemodynamically stable, blunt abdominal trauma patients by using a critical action as a reference standard. Methods: The medical records for FAST examination at a single hospital from January 2009 to February 2011 were retrospectively reviewed. The inclusion criterion was isolated, hemodynamically stable, blunt abdominal trauma. Hemodynamically unstable patients or patients with penetrating injuries were excluded. The reference standard was the presence of a critical action, which was defined as one of the following: 1) operative intervention for a finding discovered on CT, 2) interventional radiology for bleeding, 3) transfusion of 2 or more packed RBCs, or 4) death at the emergency department. Results: There were 230 patients who met the inclusion criterion. There were 20 true positive, 206 true negative, 0 false positive, and 4 false negative results. The sensitivity and the specificity were 83% and 100%, respectively. Conclusion: Despite its low sensitivity for detecting any abnormal finding discovered on CT, negative FAST could aid to exclude critical action in hemodynamically stable, blunt abdominal trauma patients.

• Tuberculosis and Respiratory Diseases
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• 제64권4호
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• pp.314-317
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• 2008

47세 남자가 내원 3주 전부터 발생한 호흡곤란 및 흉막성 흉통으로 입원하였다. 단순흉부촬영 및 흉부 CT 상 흉수 소견을 보여 시행한 흉강천자 결과, 림프구 우세 삼출액 소견을 보였으나, adenosine deaminase (ADA) 16.4 U/L로 감소하였고 세포진 검사 음성 소견을 보였다. 흉강경 검사 관찰되는 흉막의 다발성 결절에서 조직 생검 결과 전이성 유두모양 (papillary) 암으로 진단하였고, 원발 병소로 갑상샘 우엽의 미세결절 발견하여 갑상샘절제술을 시행했다. 갑상샘암은 내분비계의 악성 종양 중 가장 흔하며, 유두모양 갑상샘암이 가장 흔하다. 특징적으로 진행이 더디며 예후도 좋은 편으로, 원격 전이는 흔하지 않다. 전이성 악성 흉수는 드물게 보고되며, 대부분 원발 갑상샘암의 수술적 절제 등의 치료 후 경과 중에 재발하는 것으로 알려져 있다. 저자들은 특히 기존에 진단되지 않은 갑상샘암이, 흉수 형태로 처음 발현되는 경우를 경험하여 진단 및 치료하였기에 보고하는 바이다.