• International Journal of Precision Engineering and Manufacturing
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• 제1권2호
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• pp.105-114
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• 2000

An output feedback control (OFC) is presented for a linear stochastic system with known disturbance and applied to a flexible spacecraft for the reduction of residual vibration while allowing the natural deflection during operation. By converting the tracking problem into regulator problem, the OFC minimizes the expected value of a guadratic objective function composing of error stats which always remain on the intersection of sliding hypersurfaces. For the numerical evaluation with a flexible spacecraft, a large slewing maneuver strategy is devised with a tracking model for nominal trajectory and start-cost-stop strategy for economical maneuver in conjunction with the input shaping technique. The performance and efficacy of the proposed control scheme are illustrated with the comparison of different maneuver strategies.

• Journal of Chest Surgery
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• 제21권1호
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• pp.17-25
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• 1988

This study was undertaken to evaluate the efficacies for myocardial protective effect of retrograde right atrial perfusion [RRAP] of cardioplegia compared with antegrade aortic root perfusion [AARP]. Myocardial distribution of perfusate [using methylene blue] with RRAP was less poor to AARP. Myocardial protective effect was estimated with myocardial temperature and electron microscopy. Cooling protection of right ventricle with RRAP was similar to AARP. On the other hand, cooling protection of left ventricle with RRAP was slight poor to AARP. The electron microscopic ischemic change of right and left ventricle with RRAP was similar to AARP. RRAP was thought to be a good alternative method to perfuse cardioplegia and protect both ventricle.

• 대한물리치료과학회지
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• 제13권1호
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• pp.53-59
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• 2006

This study was performed to assess the efficacy of manipulation for the sacroiliac joint subluxation patients. The subjects of this study ware 8 patients with sacroiliac joint subluxation who visited the out patient department of the physical therapy wooridul clinic, from January 1, 2005 through July 3, 2005. To find out the effect of manipulation, we sampled 8 patient treated with manipulation(Thompson technique), using by radiographic. All patients were treated 2days a week for 12 weeks. The results after 12 week treatment, compared with before treatment, were as follows : 1. The improved in sacrum lateral subluxation in the manipulation after 12 week treatment was very significant(p<.01) 2. The improved in sacrum rotation subluxation in the manipulation after 12 week treatment was significant(p<.05) 3. The improved in lumbo-sacral anger subluxation in the manipulation after 12 week treatment was very significant(p<.01).

• Wind and Structures
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• 제16권6호
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• pp.617-627
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• 2013

In wind load calculations based on pressure measurements, the concept of 'tributary area' is usually used. The literature has less guidance for a systematic computational methodology for calculating tributary areas, in general, and for scattered pressure taps, in particular. To the best of the author's knowledge, there is no generic mathematical equation that helps calculate the tributary areas for irregular pressure taps. Traditionally, the drawing of tributary boundaries for scattered and intensively distributed taps may not be feasible (a time and resource consuming task). To alleviate this problem, this paper presents a proposed numerical approach for tributary area calculations on rectangular surfaces. The approach makes use of the available coordinates of the pressure taps and the dimensions of the surface. The proposed technique is illustrated by two application examples: first, quasi-regularly distributed pressure taps, and second, taps that have scattered distribution on a rectangular surface. The accuracy and the efficacy of the approach are assessed, and a comparison with a traditional method is presented.

• Structural Engineering and Mechanics
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• 제11권5호
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• pp.535-546
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• 2001

A new p-adaptive analysis scheme for hp-clouds method is presented. In the scheme, refined global equations are resolved into two parts, one of them being related to the newly appended dof's. The solution obtained in previous analysis step is reflected in the force vector. The size of the p-adaptive equation consisting of the newly appended dof's is much smaller than the original equation. Consequently, the computational cost is drastically decreased. Through numerical examples, the efficiency and efficacy of the method in comparison with the existing p-refinement scheme of the hp-clouds have been demonstrated.

• Nuclear Medicine and Molecular Imaging
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• 제42권sup1호
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• pp.134-136
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• 2008

Neuroblastoma is the most common extracranial solid tumor in children. In diagnostic assessment of neuroblastoma, $^{18}F-FDG$ PET has been reported to have high diagnostic performance, especially, very high sensitivity in staging, restaging, and assessment of therapeutic efficacy. In comparison with conventional diagnostic imaging modalities including a, bone scan, and MIBG scan, $^{18}F-FDG$ PET showed better diagnostic performance. According to clinical research data hitherto, $^{18}F-FDG$ PET is expected to be an effective diagnostic tool in the management of neuroblastoma.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 추계학술대회
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• pp.995-998
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• 2013

본 논문에서는 자기 조직화 기능을 갖는 Kohonen의 SOM(Self Organization Map) 신경회로망에 2단계의 학습과정을 활용하여 항공영상에서 물체를 인근의 물체와 효과적으로 구별하기 위한 접근방법을 제안하고 실제의 항공영상에 적용하여 기존의 고전적인 K-means 알고리즘 및 원래의 SOM 알고리즘보다 우수함을 보인다.

• International Journal of Computer Science & Network Security
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• 제21권4호
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• pp.19-27
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• 2021

Tasks scheduling have been gaining attention in both industry and research. The scheduling that ensures independent task execution is critical in real-time systems. While task scheduling has gained a lot of attention in recent years, there have been few works that have been implemented into real-time architecture. The efficiency of the classical scheduling strategy in real-time systems, in particular, is still understudied. To reduce total waiting time, we apply three scheduling approaches in this paper: First In/First Out (FIFO), Shortest Execution Time (SET), and Shortest-Longest Execution Time (SLET). Experimental results have demonstrated the efficacy of the SLET in comparison with the others in most cases in a wide range of configurations.

• 한국가정과교육학회지
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• 제21권1호
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• pp.89-106
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• 2009

본 연구의 목적은 가정과 교사의 가정과 교육과정 관점은 주로 어떤 유형인지, 가정과 교사로서의 교사 효능감은 어떤 수준인지, 그리고 가정과 교육과정 관점과 가정과 교사로서의 교사 효능감의 관계는 어떠한지에 대해 알아보는데 있다. 연구 자료는 전국 중 고등학교에 근무하는 가정과 교사들을 대상으로 우편을 통한 설문지로 수집하였으며, 215부를 최종 분석에 사용하였다. 자료는 SPSS/WIN(ver 10.0)프로그램을 이용하여 평균, 표준편차, 백분율, 1-검증, One-Way ANOVA와 Scheffe' 사후검증, Pearson 적률상관관계를 실시하였다. 본 연구를 통해 밝혀진 결과를 요약하면 다음과 같다. 첫째, 가정과 교사의 세 가지 교육과정 관점에 대한 전체적인 성향을 조사해본 결과, 해석적 관점이 가장 높았고, 다음으로 해방적 관점, 기술적 관점 순으로 나타났다. 교육과정 관점의 하위영역별 경향을 알아본 결과 교육목적에 대한 가정(假定)과 지식에 대한 가정(假定)에서는 해방적 관점이 가장 높은 것으로 나타났다. 학습자에 대한 가정(假定)과 사회에 대한 가정(假定)에서는 해석적 관점이 가장 높은 것으로 나타났다. 둘째, 가정과 교사의 일반적 특성에 따른 전체 교육과정 관점의 차이를 알아본 결과 해석적 관점과 해방적 관점 모두 학교소재지에 따라 특별시 광역시 소재 학교의 교사가 군 읍 면 소재 학교의 교사에 비해 해석적 관점이 강한 경향을 보였다. 또한 연령이 낮을수록, 교직경력이 짧을수록 해방적 관점의 경향이 강한 것으로 나타났다. 가정과 교사의 일반적 특성에 따른 교육과정 관점의 하위영역에 대해 살펴본 결과, 교육목적에 대한 관점에서는 연령이 적을수록 해석적 관점과 해방적 관점이 모두 강한 성향을 보였다. 해방적 관점의 경우, 또한 교직경력이 짧을수록 해방적 관점이 강한 경향을 보였다. 지식에 대한 관점의 차이를 살펴본 결과, 연령이 적을수록 해석적 관점과 해방적 관점의 성향이 높은 것으로 나타났다. 교직경력이 짧을수록 지식에 대한 해방적 관점의 성향이 높은 것으로 나타났다. 학습자에 대한 관점의 차이를 살펴본 결과, 해방적 관점의 경우, 학교소재지에 따라 특별시광역시 소재 학교의 교사집단이 군 읍 면 소재학교의 교사집단에 비해 해방적 관점이 강한 것으로 나타났다. 셋째, 가정과 교사의 전체 효능감은 평균보다 약간 높았다. 하위 영역별 효능감은 학습지원 효능감이 가장 높았고 그 다음으로 학급운영 효능감, 환경지원 효능감, 교수전략 효능감, 요구대처 효능감의 순으로 나타났다. 넷째, 일반적 특성에 따른 전체 교사 효능감의 차이는 통계적으로 의미 있게 나타나지 않았다. 다섯째, 가정과 교사의 교육과정 관점 중 해석적 관점이 다른 관점에 비해 교사 효능감과 높은 상관을 보이는 것으로 나타났다. 교사 효능감의 하위영역에서도 해석적 관점의 상관이 가장 높았으며, 요구대처 효능감에서만 기술적 관점의 상관이 높은 것으로 나타났다.

• 영어어문교육
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• 제13권2호
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• pp.129-153
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• 2007

When English language teachers are deciding on their priorities for teaching pronunciation, it is imperative to know what kind of differences and errors are most likely to interfere with communication, and what special problems particular first-language speakers will have with English pronunciation. In other words, phoneme discrimination skill is an integral part of speech processing for the EFL learners' learning to converse in English. Training using sound visualization technique can be effective in improving second language learners' perceptions and productions of segmental and suprasegmental speech contrasts. This study assessed the efficacy of a pronunciation training that provided visual feedback for EFL learners acquiring pitch and durational contrasts to produce and perceive English phonemic distinctions. The subjects' ability to produce and to perceive novel English words was tested in two contexts before and after training; words in isolation and words in sentences. In comparison with an untrained control group, trainees showed improved perceptual and productive performance, transferred their knowledge to new contexts, and maintained their improvement three months after training. These findings support the feasibility of learner-centered programs using sound visualization technique for English language pronunciation instruction.