• 한국전자거래학회지
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• 제1권2호
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• pp.133-160
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• 1996

It is accomplished on the practical usage for STEP in enterprise. But they has feeble grasp of STEP, therfore it is hard to apply. That is due to take a negative policy with the lack of advertising and understanding, most of studies are going on a studentlike attitude rather than the practical usage or implementation, so they don't know exactly what is STEP, and how can they apply to their own enterprise. This paper aimed to present more detail understanding of STEP usage and practical usage of STEP data in enterprise. We describe EXPRESS that is description method of STEP, four ways of implementation method, and introduce to using ST-Developer and ST-Oracle by STEP Tools Inc. for more detail understand of STEP. Thereafter we propose practical usage of STEP with CAD systems and PDM systems on the knowledge of previous study, and propose total system implementation image on STEP data in enterprise, finally discuss conclusion and luther study issues.

• 대한방사선기술학회지:방사선기술과학
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• 제14권1호
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• pp.45-48
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• 1991

Recently developed new step wedge has a small size as $10{\times}10\;cm^2$. It can use central beam, and is affected little by scattered rays emmitted from the neighboring step wedges. It's characteristics are same as the intensity scale method, and are excellent compared with conventional boot strap methods. Moreover, the method using new step wedge is simple in operation, and the characteristics are excellent. Now, the above method using new step wedge can supercede the distance method.

• Progress in Superconductivity
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• 제3권1호
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• pp.60-64
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• 2001

We have studied properties of step-edge Junction prepared with crystal orientation of sapphire substrate. The Step on sapphire substrates fabricated by conventional photolithography method and Ar ion milling method. $CeO_2$ buffer layer and in-situ YBCO thin film were deposited on the stepped sapphire substrates by a pulsed laser deposition method with the predetermined optimized condition. The step angle was centre fled low angle of about $25^{\circ}$. The YBCO film thickness was varied to obtain various thickness ratios of the film to the step height in a range from 0.7 to 1.2. I-V curves of junction were showed RSJ-behavior, double junction structure, and hysteresis due to the crystal orientation of substrate.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1997년도 전력전자학술대회 논문집
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• pp.318-321
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• 1997

This paper is about improving characteristic of plant by using micro-step driver method in 5 phase step motor for satisfying the condition of low oscillation and high accuracy in soldering machine. We choose open loop control method for minimizing hardware system and use one chip microprocessor, power MOSFET nd some device to realize accurate micro-step driver system.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2003년도 춘계 학술발표회논문집
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• pp.481-490
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• 2003

This paper presents an efficient eigensolution method for non-proportionally damped systems. The proposed method is obtained by applying the accelerated Newton-Raphson technique and the orthonormal condition of the eigenvectors to the linearized form of the quadratic eigenproblem. A step length and a selective scheme are introduced to increase the convergence of the solution. The step length can be evaluated by minimizing the norm of the residual vector using the least square method. While the singularity may occur during factorizing process in other iteration methods such as the inverse iteration method and the subspace iteration method if the shift value is close to an exact eigenvalue, the proposed method guarantees the nonsingularity by introducing the orthonormal condition of the eigenvectors, which can be proved analytically. A numerical example is presented to demonstrate the effectiveness of the proposed method.

• Structural Engineering and Mechanics
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• 제75권5호
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• pp.585-594
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• 2020

Detecting the damage of indeterminate trusses is of major importance in the literature. This paper proposes a quick approach in this regard, utilizing a precise mathematical approach based on Finite Element Method. Different to a general two-step method defined in the literature essentially based on optimization approach, this method consists of three steps including Damage-Suspected Element Identification step, Imminent Damaged Element Identification step, and finally, Damage Severity Detection step and does not need any optimizing algorithm. The first step focuses on the identification of damage-suspected elements using an index based on modal residual force vector. In the second step, imminent damage elements are identified among the damage-suspected elements detected in the previous step using a specific technique. Ultimately, in the third step, a novel relation is derived to calculate the damage severity of each imminent damaged element. To show the efficiency and quick function of the proposed method, three examples including a 25-bar planar truss, a 31-bar planar truss, and a 52-bar space truss are studied; results of which indicate that the method is innovatively capable of suitably detecting, for indeterminate trusses, not only damaged elements but also their individual damage severity by carrying out solely one analysis.

• 한국공간구조학회논문집
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• 제11권2호
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• pp.111-118
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• 2011

단층 래티스 돔과 같은 스페이스 프레임 구조물은 대공간을 확보하기 위하여 강접합으로 설계함으로써 경제성과 심미성 등의 장점을 확보할 수 있다. 그러나 실제 구조물의 접합상태는 완전한 강접합도, 완전한 핀접합도 아닌 접합부 상세에 따라 중간적인 특성을 나타내는 반강접합이 일반적이다. 본 연구에서는 저자 등에 의해 제안된 Step-Up Erection 공법을 적용하여 단층 라멜라 돔의 접합부 강성에 따른 시공 중의 좌굴 특성을 해석적으로 규명하였다. 얻어진 결과는 시공 Step이 증가할수록 그리고 접합부 휨강성이 핀접합에 가까울수록 좌굴내력은 감소하였으며, 좌굴모드는 시공 Step이 증가할수록, 접합부 휨강성이 강접합에 가까울수록 돔의 정점 부근에서 뜀좌굴 현상에 의한 절점좌굴이 발생하였다. 또한, 시공 Step이 낮을 경우 저면 경계부의 원주방향 부재에서 큰 인장응력 분포를 나타내었으며, 시공 Step이 증가할수록 정점 중앙부에서 큰 압축응력 분포를 보였다. 완성돔을 제외한 시공 중 Step에서는 Step이 증가할수록, 접합부 휨강성이 핀접합에 가까울수록 저면부 경선방향 부재에서 큰 인장응력 분포를 나타내었다.

• Journal of Nutrition and Health
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• 제42권2호
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• pp.158-170
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• 2009

This study was conducted to examine the usefulness of adding final probing step (step3) in dietary assessment by 24-hour recall method among Korean adults. One-hundred fifty five adults (37 males and 118 females) above 30 years of age who visited hospitals for health examination were recruited at three hospitals in Korea. One day dietary intake was obtained using 24-hour recall method from each subject. Dietary interview was conducted in 3 steps, (1) quick list of foods eaten during the previous day, (2) detailed information of all the foods eaten, (3) the final probing for any items forgotten. Items added at the step3 were identified and contributions of energy and nutrient intakes were calculated. The average duration of interview was 10.5 min, and time spent for each step was 4.12 minute for step 1, 5.62 minute for step 2, and 38 second for step 3. The average number of dishes reported by the subjects added at the step 3 was 2.2. (Males = 2.6, Females = 1.6) Frequently reported dishes in the step 3 were Beverage, Tea, alcohol (37.1%) and Fruits (31.8%). From mean total energy intake of 1,589 kcal (Men = 1,846 kcal, Women = 1,509 kcal), 179 kcal (11.3%) was added at the step 3. In the step 3, nutrient intakes increased significantly except retinol in total subjects and except retinol and cholesterol in males but all nutrients increased significantly in females. The final probing step can add significant information on intakes of foods and many nutrients with only about 38 seconds of interview time. Confirmation of the results with larger samples of different age groups is needed.

• 한국산업정보학회논문지
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• 제8권4호
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• pp.26-30
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• 2003

대칭이고 큰 희소 행렬(Large Sparse Matrices)에 대한 가장 작거나 또는 가장 큰 고유치(Eigenvalues)들을 구하기 위해서 Lanczos 방법이 많이 이용된다. MP(Message Passing) 병렬 컴퓨터에서 global communications은 계산 속도를 떨어뜨린다. 본 논문에서는 s-step Lanczos 알고리즘을 소개하였으며 이 s-step 방법은 기존의 Lanczos 알고리즘에 의해 생성된 행렬에 유사한 축소 행렬을 생성하며 s-step Lanczos 알고리즘에서 한번의 반복은 기존의 Lanczos 알고리즘의 s 번 반복에 해당한다. s-step 방법은 global communications을 최소화하였으며 기존의 알고리즘에 비해 뛰어난 병렬 성질을 가진다. 알고리즘들은 Cray T3E에서 수행되었으며 그 결과를 볼 수 있다.

• 한국군사과학기술학회지
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• 제9권3호
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• pp.132-140
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• 2006

In this paper, a new fault detection method for the extended Kalman filter, which uses a N-step predictor, is proposed. The N-step predictor performs the only time propagations for N-step intervals without measurement updates and its output is used as a monitoring signal for the fault detection. A consistency between the extended Kalman filter and the N-step predictor is tested to detect a fault. A test statistic is defined by the difference between the extended Kalman filter and the N-step predictor. The proposed method is applied to strapdown inertial navigation system (SDINS). By computer simulation, it is shown that the proposed method detects a fault effectively.