• 제목/요약/키워드: transformation method

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Digital Transformation in Summer Training Process at King Abdulaziz University: Action Design Research in Practice

  • Bahaddad, Adel;Bitar, Hind
    • International Journal of Computer Science & Network Security
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    • 제22권7호
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    • pp.171-180
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    • 2022
  • In the knowledge development of online assessment in learning management systems (LMSs), many assessments are evaluated weekly in the summer training course for undergraduate students in the Faculty of Computing and Information Technology at King Abdul-Aziz University in Saudi Arabia. The number of performance assessments in the summer training course reaches 15 weeks. Many of them, however, are sent or done informally or through unreliable ways and cannot be verified by third parties. Therefore, applying the concept of digital transformation is essential. This research study reported herein used the action design research (ADR) method to build a new information technology system that could assist in the digital transformation. An electronic platform was designed, developed, implemented, and evaluated using the ADR method so that the main people involved in the summer training process (i.e., students, academic supervisors, and administrators) would have a high level of satisfaction with it. The study was conducted on 452 students, 105 academic supervisors, and 15 administrative staff and was conducted during the summer semester of 2020. All the training processes were digitally transformed and automated to control and raise the level and reliability of the training. All involved people were satisfied, thus, shifting the process to be in a digital form assist in achieving the high-level goal.

자기 조직화 지도를 이용한 다중 평면영역 검출 (Multiple Plane Area Detection Using Self Organizing Map)

  • 김정현;등죽;강동중
    • 제어로봇시스템학회논문지
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    • 제17권1호
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    • pp.22-30
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    • 2011
  • Plane detection is very important information for mission-critical of robot in 3D environment. A representative method of plane detection is Hough-transformation. Hough-transformation is robust to noise and makes the accurate plane detection possible. But it demands excessive memory and takes too much processing time. Iterative randomized Hough-transformation has been proposed to overcome these shortcomings. This method doesn't vote all data. It votes only one value of the randomly selected data into the Hough parameter space. This value calculated the value of the parameter of the shape that we want to extract. In Hough parameters space, it is possible to detect accurate plane through detection of repetitive maximum value. A common problem in these methods is that it requires too much computational cost and large number of memory space to find the distribution of mixed multiple planes in parameter space. In this paper, we detect multiple planes only via data sampling using Self Organizing Map method. It does not use conventional methods that include transforming to Hough parameter space, voting and repetitive plane extraction. And it improves the reliability of plane detection through division area searching and planarity evaluation. The proposed method is more accurate and faster than the conventional methods which is demonstrated the experiments in various conditions.

디지탈재설계법에 의한 크레인계의 제어 (Control of Crane Systems by a Digital Redesign Method)

  • 이동철;신민생;하주식;김상봉
    • 대한기계학회논문집
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    • 제16권1호
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    • pp.41-52
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    • 1992
  • 본 연구에서는 쌍선형 함수를 이용하여 연속시스템의 상태공간에서 설계된 폐 루우프계로 부터 이산시스템의 피이드백 게인행렬을 얻을 수 있는 디지탈재설계법이 제안 되었고, 크레인의 실시간 제어를 통해 본 연구에서 제안된 디지탈 재설계법의 유 효성을 확인했다.

이중 밀도 웨이브렛 변환의 성능 향상을 위한 3방향 분리 처리 기법 (The Three Directional Separable Processing Method for Double-Density Wavelet Transformation Improvement)

  • 신종홍
    • 디지털산업정보학회논문지
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    • 제8권2호
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    • pp.131-143
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    • 2012
  • This paper introduces the double-density discrete wavelet transform using 3 direction separable processing method, which is a discrete wavelet transform that combines the double-density discrete wavelet transform and quincunx sampling method, each of which has its own characteristics and advantages. The double-density discrete wavelet transform is nearly shift-invariant. But there is room for improvement because not all of the wavelets are directional. That is, although the double-density DWT utilizes more wavelets, some lack a dominant spatial orientation, which prevents them from being able to isolate those directions. The dual-tree discrete wavelet transform has a more computationally efficient approach to shift invariance. Also, the dual-tree discrete wavelet transform gives much better directional selectivity when filtering multidimensional signals. But this transformation has more cost complexity Because it needs eight digital filters. Therefor, we need to hybrid transform which has the more directional selection and the lower cost complexity. A solution to this problem is a the double-density discrete wavelet transform using 3 direction separable processing method. The proposed wavelet transformation services good performance in image and video processing fields.

요동운동 롤러 종동절과 디스크 캠 기구의 운동해석을 위한 원호 접근법에 관한 연구 (A Study on circular Arc Approach for Motion Analysis of Oscillating Roller Follower and Disk Cam Mechanisms)

  • 구병국;신중호;윤호업;장옥화
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 추계학술대회 논문집
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    • pp.523-526
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    • 2000
  • This paper performs the motion analysis for a disk cam and a follower mechanism using a circular arc method, a coordinate transformation method and an instant velocity method in order to find a contact point between the cam and the follower. Based on the proposed method, the displacement and the velocity are calculated by using the geometric relationships of the cam mechanism. Also, the acceleration is determined on using the central difference method. As the results, this paper presents the original curve and the analyzed curve for the motion analysis of the disk cam for an example.

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An Empirical Characteristic Function Approach to Selecting a Transformation to Normality

  • Yeo, In-Kwon;Johnson, Richard A.;Deng, XinWei
    • Communications for Statistical Applications and Methods
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    • 제21권3호
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    • pp.213-224
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    • 2014
  • In this paper, we study the problem of transforming to normality. We propose to estimate the transformation parameter by minimizing a weighted squared distance between the empirical characteristic function of transformed data and the characteristic function of the normal distribution. Our approach also allows for other symmetric target characteristic functions. Asymptotics are established for a random sample selected from an unknown distribution. The proofs show that the weight function $t^{-2}$ needs to be modified to have thinner tails. We also propose the method to compute the influence function for M-equation taking the form of U-statistics. The influence function calculations and a small Monte Carlo simulation show that our estimates are less sensitive to a few outliers than the maximum likelihood estimates.

변환법에 의한 설계홍수량의 유도(II) -비년초과치계열을 중심으로- (Derivation of Design Flood by Transformation Method(II) - On the non-annual exceedance series-)

  • 이순혁;맹승진
    • 한국농공학회지
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    • 제37권5호
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    • pp.111-118
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    • 1995
  • 첨두유량이 연속적으로 발생하므로 인하여 수리구조물의 파괴에 영향을 끼치는 설계홍수량의 추정을 위해 본 연구에서는 제I보에 이어 2차적으로 부분 기간 계열인 금강, 영산강 및 섬진강 수계 6개 유역의 비년 초과치를 중심으로 하여 변환법인 SMEMAX법, 멱변화(Power Transformation) 및 2단계 멱변환(Two Step Power Transformation, TSPT)법에 의해 빈도분포의 정규화를 시도하고 이들에 대한 정규화 효율성의 비교분석과 설계홍수량 유도를 위한 변환법별 적합도 검정을 수행하였다. 왜곡분포의 정규화 시도는 제I보의 결과와 마찬가지로 SMAMAX 및 Power변환법에서는 빈도분포의 정규화가 미흡하였으나 2단계 멱변환법에서는 빈도분포의 만족한 정규화를 기할 수 있었다. 또한 3개 변환법에 의해 유도된 설계홍수량의 비교 분석에서는 3개 방법 모두 재현기간 20년 이내의 설계홍수량이 거의 유사한 결과를 나타내었으며 Kolmogorov-Smirnov Test에 의한 3개 변환법별 적합도검정 결과 2단계 멱변환법이 적정 변환법으로 인정되었다.

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탄성 다물체계의 체계적인 동역학적 해석 (A Systematic Formulation for Dynamics of Flexible Multibody Systems)

  • 이병훈;유완석
    • 대한기계학회논문집
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    • 제17권10호
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    • pp.2483-2490
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    • 1993
  • This paper presents a systematic formulation for the kinematic and dynamic analysis of flexible multibody systems. The system equations of motion are derived in terms of relative and elastic coordinates using velocity transformation technique. The position transformation equations that relate the relative and elastic coordinates to the Cartesian coordinates for the two contiguous flexible bodies are derived. The velocity transformation matrix is derived systematically corresponding to the type of kinematic joints connecting the bodies and system path matrix. This matrix is employed to represent the equations of motion in relative coordinate space. Two examples are taken to test the method developed here.

프랙탈 부호화를 이용한 영상 영역 분할에 관한 연구 - 고속 영역 분할법 - (A Study on Image Segmentation using Fractal Image Coding - Fast Image Segmentation Scheme -)

  • 유현배;박지환
    • 한국멀티미디어학회논문지
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    • 제4권4호
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    • pp.234-332
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    • 2001
  • 프랙탈 영상 부호화의 새로운 응용 분야인 프랙탈 영역 분할법의 YST방법은 주기점에 의한 라벨 붙이기와 프랙탈 변환에 의한 라벨 수정을 병용한 영역 분할법을 제안하였다. 그러나 이 개선법은 영역 분할의 질적인 개선은 가능하였으나, 여전히 라벨 붙이기와 라벨 수정의 과정에서 중복성이 남아 있다. 이 문제점의 해결방안으로 본 논문에서는 궤도에 따른 라벨 붙이기와 프랙탈 변환의 반복 과정에 관한 제약 조건을 제안한다.

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Ferromagnetic Resonance Observation of Martensitic Phase Transformation in Ni-Mn-Ga Ferromagnetic Shape Memory Films

  • Dubowik, J.;Kudryavtsev, Y.V.;Lee, Y.P
    • Journal of Magnetics
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    • 제9권2호
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    • pp.37-39
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    • 2004
  • Polycrystalline Ni-Mn-Ga films have been deposited onto mica substrates held at 720 K by flash-evaporation method. At room temperature the films have a tetragonal structure with a = b = 0.598 and c = 0.576 nm typical for bulk $Ni_2MnGa$ below a martensitic transformation. Temperature measurements of ferromagnetic resonance reveal a martensitic phase transformation at 310 K. The transformation brings about a substantial decrease in the effective magnetization and a drastic increase in the ferromagnetic resonance linewidth due to a strong increase in the magnetic anisotropy in the martensitic phase.