• 정보처리학회논문지A
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• 제9A권2호
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• pp.267-270
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• 2002

비중심 $\chi^2$분포의 누적분포 함수의 계산은 $\chi^2$검정에서 검정력 계산에 요구된다. 본 논문서는 중심 $\chi^2$분포 함수를 통하여 비중심 $\chi^2$분포 함수의 계산을 구하는 알고리즘을 제시하고 있으며 기존의 접근 방법에 의한 계산 결과와 비교하였다.

• 대한치과의사협회지
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• 제48권4호
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• pp.288-296
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• 2010

Although non-surgical endodontic procedures have high success rates, failures do occur, These can be managed by root canal re-treatment or surgical intervention. Intentional replantation is an accepted endodontic treatment procedure in which a tooth is extracted and treated outside the oral cavity and then inserted into its socket to correct an obvious radiographic or clinical endodontic failure. Intentional replantation is indicated when other endodontic treatments performed to maintain the tooth have failed, or when endodontic periradicular surgery is not feasible. Intentional replantation may be particularly useful in these cases because these difficult to access areas can be maximally treated while the tooth is out of the mouth without damaging the periodontal attachment in adjacent teeth. In conclusion, intentional replantation is a reliable and even predictable procedure, and should be considered more often as a treatment modality in our efforts to maintain the natural dentition.

• 한국산업보건학회지
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• 제29권4호
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• pp.508-516
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• 2019

Objectives: The present study was performed to obtain acute toxicity information on glyoxal in male rats after intratracheal instillation. Methods: In order to calculate the LD₅₀ of glyoxal using Probit analysis with SAS, the test article was one intratracheal instillation to male Sprague-Dawley rats at dose levels of 0, 225, 451 or 902 mg/kg. During the test period, mortality, clinical signs, and body and organ weights were examined. At the end of the 14-day observation period, all animals were sacrificed and complete gross postmortem and histopathological examinations were performed. Results: Four animals of the 902 mg/kg group died within one week after the administration of glyoxal. All treatment group in a dose dependent manner, decreased body weight was found during the study period. The absolute and relative lung weight, and histopathological changes (bronchiolar-alveolar hyperplasia, chronic inflammation) of lung exhibited an increased in glyoxal treated groups in a dose dependent manner. However, there were no changes on the organ weights and histopathological changes of any other organ except lung. Conclusions: The results obtained in the present study suggest that the LD₅₀ in male Sprague-Dawley rats after a single intratracheal instillation of glyoxal was considered to be 866.9 mg/kg and the lung was found to be the target organ for glyoxal.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2010년도 제39회 하계학술대회 초록집
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• pp.18-18
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• 2010

Methods of the characteristics evaluation of turbo-molecular pumps (TMP) are well-defined in the international measurement standards such as ISO, PNEUROP, DIN, JIS, and AVS. The Vacuum Center in the Korea Research Institute of Standards and Science has recently designed, constructed, and established the integrated characteristics evaluation system of TMPs based on the international documents by continuously pursuing and acquiring the reliable international credibility through measurement perfection. The measurement of TMP pumping speed is normally performed with the throughput and orifice methods dependent on the mass flow regions. However, in the UHV range of the molecular flow region, the high uncertainties of the gauges, mass flow rates, and conductance are too critical to precisely accumulate reliable data. With UHV gauges of uncertainties less than 15% and a calculated conductance of the orifice, about 35% of pumping speed uncertainties are experimentally derived in the pressure range of less than $10^{-6}$ mbar. In order to solve the uncertainty problems of pumping speeds in the UHV range, we introduced an SRG with 1% accuracy and a constant volume flow meter (CVFM) to measure the finite mass flow rates down to $10^{-3}$ mbar-L/s with 3% uncertainty for the throughput method. In this way we have performed the measurement of pumping speed down to less than $10^{-6}$ mbar with an uncertainty of 6% for a 1000 L/s TMP. In this article we suggest that the CVFM has an ability to measure the conductance of the orifice experimentally with flowing the known mass through the orifice chambers, so that we may overcome the discontinuity problem encountering during introducing two measurement methods in one pumping speed evaluation sequence.

• 한국수학교육학회지시리즈A:수학교육
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• 제45권1호
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• pp.97-104
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• 2006

The purpose of this study is to extract some suggestions in developing the elementary students' abilities to solve the fundamental mathematical problems by analyzing the degree of the correlation between the fundamental mathematical capability and the reading capability of the elementary 3th graders. In order to achieve this goal, this article analyzed the correlation between the fundamental mathematical capability and the reading capability on the basis of the studying result about the diagnostic evaluation conducted on 20,556 elementary 3th graders by the KICE as a national level basic scholastic achievement evaluation. The coefficient of correlation between the fundamental mathematical capability and the reading capability was .621. As such, it shows that the reading capability plays an important role in solving the fundamental mathematical problems. Particularly, the coefficient of correlation between the corollary arguments and the problem solving ability and the reading capability was the highest among the sub-capabilities of fundamental mathematical capability. In addition, judging from the result that the coefficient of correlation between the practical understanding capability and the solving capability of the fundamental mathematical problems was .528, it informs that the practical understanding capability takes an' important part in developing the fundamental mathematical capability of the elementary students. The results of this study support the hypothesis that the understanding capability plays the very important role in solving the fundamental mathematical problems. In particular, the results suggest that it is necessary that the pupils should be simultaneously supported not only by the capability of the mathematical basis, but also by the reading capability, especially the practical understanding capability about the problems, in order to develop the capability to solve the fundamental mathematical problems.

• 정보화정책
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• 제25권4호
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• pp.3-36
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• 2018

본 연구에서는 ICT가 융합된 미래 교육에 대한 다양한 논의를 교육의 목표, 내용, 방법, 평가의 측면에서 고찰하여 ICT 활용 교육의 동향과 전망을 제시하였다. 첫째, ICT 교육의 목표는 다양한 정체성을 바탕으로 역동적인 사회 참여를 가능케하는 디지털 시민성의 구성이다. 디지털 시민성의 확립을 위해서 ICT 교육은 '평생 학습자', '정보생산자이자 소비자', '지역적 세계적 시민' 등을 학습자의 미래 핵심 역량으로 인식하고 있다. 둘째, 교육내용 측면에서 중요성이 부각되고 있는 것은 SW 교육이다. 이에 실제 수업 적용을 위한 프로그램 개발 연구나 효과성 검증 연구가 활발하게 진행되고 있다. 그러나 교육환경 개선과 함께 교사 역량을 강화할 수 있는 제도적 지원, 교과교육과의 통합 운영 역량 강화 등이 뒷받침되지 않는다면 미래 사회를 대비하기 위한 교육내용으로서의 적절성이 반감될 것이다. 셋째, 교육 방법으로서 플립러닝이나 증강현실 등 다양한 ICT가 실제 수업에 적용되고 있다. 각 교과별로 가장 활발하게 연구가 진행되는 분야로서, 해당 기술을 활용한 수업의 설계, 수업의 효과성을 보여주는 연구들은 기존 교육방법을 보완하고 ICT 교육 현장의 질적 변화를 이끄는 데 토대가 될 것이다. 넷째, 평가와 관련된 논의는 컴퓨터 기반 평가에 집중되어 있다. ICT를 활용한 평가는 학습자의 특성 및 수준을 정확하게 파악하고 적절한 방법의 교수-학습 과정을 전반적으로 안내하는 평가의 본질에 더욱 효과적으로 기여할 것이다. 이상의 ICT 교육에 관한 종합적인 검토와 함께 교육 불평등의 관점에서 평가한 ICT 교육의 가능성을 논의하였다.

• Child Health Nursing Research
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• 제20권4호
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• pp.283-293
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• 2014

목적 간호의 질을 평가함에 있어 환자의 측면에서 평가하는 것의 중요성이 점점 증가되고 있다. 본 연구의 목적은 환자의 눈을 통해 간호의 질을 평가하는 QUOTE 평가의 속성을 발견하고 제시하는 것이다. 방법 본 연구에서는 1997년부터 2013년까지 이루어진 QUOTE 평가 관련 국외 연구논문을 통합적 고찰 방법으로 분석하였고 Whittemore와 Kanfl (2005)이 제시한 4단계에 따라 연구를 진행하였다. 결과 본 연구에서 분석한 QUOTE 관련 연구는 총 32편이었으며, 분석을 통해 QUOTE 평가는 환자와 가족의 개별성을 인정함, 간호사의 다양한 역량을 평가함, 간호환경의 질을 평가함, 모든 평가과정에 대상자가 참여함의 4가지 주요한 속성을 가지는 것으로 밝혀졌다. 결론 본 연구는 임상현장에서 환자와 가족중심 간호를 제공하고 그 간호의 질을 평가할 때 유용하게 사용할 수 있는 평가 개념을 소개하고 그 핵심 속성에 대한 이해를 돕기 위해 시도되었다. QUOTE 평가에 대한 통합적 고찰이 국내 간호 현장에 맞는 다양한 도구개발로 이어진다면, 아동 간호현장에서 대상자와 가족에게 제공되는 간호에 대한 적합한 질 평가와 지속적 질 향상에 기여할 수 있을 것이다.

• 한국문헌정보학회지
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• 제27권
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• pp.183-214
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• 1994

The purpose of this study is to suggest the schemes to enhance information service functions by the utilization of CD-ROM in medical school libraries. The results of the study are summarized as follows : 1. The selection and evaluation of CD-ROM database are necessary steps in the planning of a CD-ROM. Before the CD-ROM is selected, therefore, medical libraries must make a practical evaluation criteria in important order of information services environment, characteristics of hardware/software, service requirements, price and cost, etc. 2. If possible, CD-ROM MEDLINE must be suited for the information services environment. 3. In case of the popular core journals, full-text CD-ROM should be gradually purchased. 4. In order to reduce the time required from search of bibliographic informations to receipt of original articles, CD-NET system and library holding administration program must be built up and developed. And channel of information search and order/receipt of original article should be varied. 5. Search education program for medical librarians and users should be enforced, and librarians must play an important role in CD-ROM retrieval consultant and intermediator.

• Smart Structures and Systems
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• 제30권3호
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• pp.287-301
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• 2022

The machine-vision based structural displacement measurement methods are widely used due to its flexible deployment and non-contact measurement characteristics. The accuracy of vision measurement is directly related to the image resolution. In the field of computer vision, super-resolution reconstruction is an emerging method to improve image resolution. Particularly, the deep-learning based image super-resolution methods have shown great potential for improving image resolution and thus the machine-vision based measurement. In this article, we firstly review the latest progress of several deep learning based super-resolution models, together with the public benchmark datasets and the performance evaluation index. Secondly, we construct a binocular visual measurement platform to measure the distances of the adjacent corners on a chessboard that is universally used as a target when measuring the structure displacement via machine-vision based approaches. And then, several typical deep learning based super resolution algorithms are employed to improve the visual measurement performance. Experimental results show that super-resolution reconstruction technology can improve the accuracy of distance measurement of adjacent corners. According to the experimental results, one can find that the measurement accuracy improvement of the super resolution algorithms is not consistent with the existing quantitative performance evaluation index. Lastly, the current challenges and future trends of super resolution algorithms for visual measurement applications are pointed out.

• Nuclear Engineering and Technology
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• 제44권7호
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• pp.773-780
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• 2012

The article presented is concerned with an evaluation of the corrosion behavior of SA-508 low alloy steel (LAS) and Type 309L stainless steel (SS) cladding of a reactor pressure vessel under the simulated primary water chemistry of a pressurized water reactor (PWR). The uniform corrosion and galvanic corrosion rates of SA-508 LAS and Type 309L SS were measured in three different control conditions: power operation, shutdown, and power operation followed by shutdown. In all conditions, the dissimilar metal coupling of SA-508 LAS and Type 309L SS exhibited higher corrosion rates than the SA-508 base metal itself due to severe galvanic corrosion near the cladding interface, while the corrosion of Type 309L in the primary water environment was minimal. The galvanic corrosion rate of the SA-508 LAS and Type 309L SS couple measured under the simulated power operation condition was much lower than that measured in the simulated shutdown condition due to the formation of magnetite on the metal surface in a reducing environment. Based on the experimental results, the corrosion rate of SA-508 LAS clad with Type 309L SS was estimated as a function of operating cycle simulated for a typical PWR.