• 산업경영시스템학회지
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• 제37권1호
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• pp.127-132
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• 2014

This study is concerned with process capability index in single process. We enumerated issues on the calculation of process capability index and described the effects of these issues. We explained the development process and the reason of the representative existing process capability indices. We investigated whether the indices agree with the concept of process capability and drew the problems from those results. In addition, we proposed alternative and direction to seize the process capability necessary to the field.

• 지구물리
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• 제9권3호
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• pp.263-272
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• 2006

Since the paleomagnetic study was introduced in Korea about 40 years ago, its scientific findings contributed to the understanding of geologic settings and tectonic processes of the Korean Peninsula and eventually to the escalation of geology and geophysics in Korea. It is worth summarizing and introducing the up-to-date paleomagnetic results produced by the representative paleomagnetic working groups in Korea, such as K. D. Min, I. S. Kim, S. J. Doh, Y. S. Lee, D. W. Suk, the late K. H. Kim and others.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.179-180
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• 2020

In the budgeting guidelines, there are rules for calculating design fee and direct costs. However, only the design fee is calculated excluding the direct cost, which causes the cost to be insufficient. Therefore, this study is designed to analyze representative cases where direct costs are insufficient, draw out problems, and propose a way to improve design fees.

• Journal of Advanced Marine Engineering and Technology
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• 제25권1호
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• pp.115-123
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• 2001

This study describes the combustion characteristics under various condition of air excess ratio and ignition timing in a 2-valve gasoline optically accessible engine with swirl control valve(SCV). It adapted three different types of SCA(open ration 72.5%, 78%, 89%) to strengthen a swirl flow. Pressure data were acquired using pressure sensor to investigate the effect of swirl flow on combustion, and from these pressure data, IMEP(indicated mean effective pressure) and MFB(mass fraction burnt)were calculated to explain burn rate and flame speed. From acquired flame images, inspected the flame propagation direction, flame area, and flame centroid, Flame propagation direction was shown different tendency between with/without SCV, and flame area with SCV was faster and larger than that of conventional engine. Finally, the representative flame image at each crank angle were acquired by PDF method to verify flame growth process. It is found that strengthened swirl flow is more beneficial for faster and stable combustion.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2012년도 추계학술대회
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• pp.533-535
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• 2012

본 연구에서는 플랫폼 비즈니스 모델의 진화방향에 대한 탐색적 사례연구를 수행하고자 한다. 이를 위하여 플랫폼 비즈니스와 비즈니스 모델에 대하여 각각 정의하고, 대표적인 플랫폼 비즈니스 모델을 선택하고 새로운 기술적 변화 요인과 상호작용하는 가운데, 플랫폼 비즈니스가 어떠한 변화방향을 가지고 진화하게 되는지에 대하여 제시하고자 한다.

• ETRI Journal
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• 제46권2호
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• pp.250-262
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• 2024

Air-writing recognition is relevant in areas such as natural human-computer interaction, augmented reality, and virtual reality. A trajectory is the most natural way to represent air writing. We analyze the recognition accuracy of words written in air considering five features, namely, writing direction, curvature, trajectory, orthocenter, and ellipsoid, as well as different parameters of a hidden Markov model classifier. Experiments were performed on two representative datasets, whose sample trajectories were collected using a Leap Motion Controller from a fingertip performing air writing. Dataset D₁ contains 840 English words from 21 classes, and dataset D₂ contains 1600 English words from 40 classes. A genetic algorithm was combined with a hidden Markov model classifier to obtain the best subset of features. Combination ftrajectory, orthocenter, writing direction, curvatureg provided the best feature set, achieving recognition accuracies on datasets D₁ and D₂ of 98.81% and 83.58%, respectively.

• 터널과지하공간
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• 제8권3호
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• pp.226-233
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• 1998

자연적으로, 혹은 인위적으로 발생된 균열들은 현지암반의 공학적 거동에 대한 중요한 자료를 제공한다. 일정한 방향으로 분포하는 미세균열들은 암반의 물성에 현저한 영향을 미치게 되지만, 다른 요인들에 의한 이방성이 큰 경우에는 이들의 영향은 감소한다. 본 연구에서는 초음파속도의 이방성과 점하중 재하에 의한 인공균열의 진행방향을 기초로, 암석조직이 암석의 물성에 미치는 영향에 대하여 조사하였다. 암석시료는 우백질의 포천화강암 석재에서 코어링한 NX 시험편과 현장 시추코어를 사용하였다. 시료에 분포하는 균열들의 주 방향을 기준으로 설정한 후, 초음파속도의 이방성을 측정한 결과, 균열에 수직한 방향에서 초음파속도의 최소치가 측정되었다. 속도측정에 사용한 NX코어로부터 EX크기의 원판형 시험편을 성형한 수 점하중 재하실험을 수행하였으며, 점하중재하에 의한 인공균열의 진행방향은 기존의 미세균열의 방향과 거의 일치하였다.

• Journal of Mechanical Science and Technology
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• 제16권11호
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• pp.1379-1394
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• 2002

In case of a single input single output (SISO) system with a nonlinear term, a signal compression method is useful to identify a system because the equivalent impulse response of linear part from the system can be extracted by the method. However even though the signal compression method is useful to estimate uncertain parameters of the system, the method cannot be directly applied to a unique system with hysteresis characteristics because it cannot estimate all of the two different dynamic properties according to its motion direction. This paper proposes a signal compression method with a pre-processor to identify a unique system with two different dynamics according to its motion direction. The pre-processor plays a role of separating expansion and retraction properties from the system with hysteresis characteristics. For evaluating performance of the proposed approach, a simulation to estimate the assumed unknown parameters for an arbitrary known model is carried out. A motion platform with several single-rod cylinders is a representative unique system with two different dynamics, because each single-rod cylinder has expansion and retraction dynamic properties according to its motion direction. The nominal constant parameters of the motion platform are experimentally identified by using the proposed method. As its application, the identified parameters are applied to a design of a sliding mode controller for the simulator.

• 한국콘텐츠학회논문지
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• 제13권8호
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• pp.93-100
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• 2013

로버트 지메키스 감독의 작품은 사실적인 디지털 케릭터가 등장하는 <폴라 익스프레스>를 제작하면서 많은 주목을 받아왔다. 비록 그가 <화성은 엄마가 필요해>를 마지막으로 애니메이션 제작을 중단하였지만, 그가 입체영상을 기반으로 제작한 3D 입체 애니메이션은 입체영상의 연출 방법에 있어 많은 기여를 하였다. 본 연구에서는 입체영상의 이론적 배경과 입체영상 쇼트 구성 시 연출방법에 있어 유의점 등을 토대로 로버트 지메키스의 대표적인 입체영상 작품을 비교분석하였다. 분석한 작품으로는 <폴라 익스프레스>, <크레스마스 케롤>를 중심으로 로버트 지메키스가 작품에서 입체감을 높이기 위해 공통적으로 연출한 표현기법에 대해서 고찰해 보았다.

• 한국조경학회지
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• 제16권2호
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• pp.59-68
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• 1988

The relative difference between Korean rural region and urban region has increased by the rapid urbanization and industrialization since 1960. Therefore it will be important to raise the income of the people living in rural region. So the Korean government established the collective side job area and rural industrial area for the increasing of the non-agricultural income. For this, the touristic resources development is also the another important means of the rural region development. So the purpose of this thesis exists in the presentation of the direction of the touristic resources development in rural region. For this purpose, three representative regions among the Korean rural regions were selected and the case study was accomplished. In this way the rough direction of the touristic resources development in rural region has presented The direction of the development and the conclusion were as follows : 1)Planners must establish the planning with the vision and demand of future than percent condition. 2)Because the urbanization is continued incessantly, the rural region is developed to be the space of resort. 3)The touristic resources development in rural region is contributed to the regional development through the raising interaction of the touristic resources. 4)The rural region is developed to be the space of the Korean rural tradition 5)The grassland os constructed in the mountenous land and the landscape of the Korean national land is changed to be the picturesque landscape. 6)The construction of the traditional artistic products is accomplished to increase the income of the people in rural region.