• 한국전자통신학회논문지
• /
• 제18권4호
• /
• pp.687-692
• /
• 2023

이번 연구는 양자 컴퓨터가 가지는 중첩의 특성을 이용하여 음악을 만들어 보고자 하는 의도에서 시작하였다. 기존의 음악은 작곡가가 작곡한 것에 제한되는 특징을 가진다. 하지만, 양자 컴퓨터의 중첩을 이용한 음악은 제한된 범위 내에서 실행 시에 변화되는 음악적 특징을 가진다. 이를 이용하여, 실행 시에 특정 화음을 기준으로 변화하는 음악을 만들 수 있을 것이다. 이번 논문에서는 양자 컴퓨터와 기존 컴퓨터를 연결하여 소리를 발생시킨다, 그리고 중첩의 성질을 적용하여 변화하는 음을 만들어내는 것에 중점을 둔다.

• 한국정밀공학회지
• /
• 제11권4호
• /
• pp.47-57
• /
• 1994

This study investigates the crack propagation behavior to examine the effect of welding residual stress by the superposition method. Especially, as the crack propagation behavior is affected by the applied stress and the stress ratio in compressive residual stress filed, it is studied for three cases as follows; (1) $K_{min}$is smaller than l $K_{r}$l, (2) $K_{min}$ is smaller than l $K_{r}$l in the later stage, (3) $K_{min}$is lager than l $K_{r}$l. The resuslts show that the superposition method is very useful in all the three cases of compressive residual stress field, but is inappropriate in predicting the crack propagation behavior in tensile residual stress field.field.field.

• Structural Engineering and Mechanics
• /
• 제73권3호
• /
• pp.271-286
• /
• 2020

Passive control technologies are commonly used in several areas to suppress structural vibrations by the addition of supplementary damping, and some modal damping may be heavy beyond critical damping even for regular structures with energy dissipation devices. The design of passive control structures is typically based on (complex) mode superposition approaches. However, the conventional mode superposition approach is predominantly applied to cases of under-critical damping. Moreover, when any modal damping ratio is equal or close to 1.0, the system becomes defective, i.e., a complete set of eigenvectors cannot be obtained such that some well-known algorithms for the quadratic eigenvalue problem are invalid. In this paper, a generalized complex mode superposition method that is suitable for under-critical, critical and over-critical damping is proposed and expressed in a unified form for structural displacement, velocity and acceleration responses. In the new method, the conventional algorithm for the eigenvalue problem is still valid, even though the system becomes defective due to critical modal damping. Based on the modal truncation error analysis, modal corrected methods for displacement and acceleration responses are developed to approximately consider the contribution of the truncated higher modes. Finally, the implementation of the proposed methods is presented through two numerical examples, and the effectiveness is investigated. The results also show that over-critically damped modes have a significant impact on structural responses. This study is a development of the original complex mode superposition method and can be applied well to dynamic analyses of non-classically damped systems.

• Geomechanics and Engineering
• /
• 제15권5호
• /
• pp.1029-1038
• /
• 2018

A superposition-iteration (S-I) model is proposed to simulate the jet grouting pre-reinforcing impact for a shallow-buried tunnel. The common model is deduced by theoretical (force equilibrium) analysis and then transformed into the numerical formulation. After applying it to an actual engineering problem, the most obvious deficiency was found to be continuous error accumulation, even when the parameters change slightly. In order to address this problem, a superposition-iteration model is developed based on the basic assumption and superposition theory. First, the additional deflection between two successive excavation steps is determined. This is caused by the disappearance of the supporting force in the excavated zone and the soil pressure in the disturbed zone. Consequently, the final deflection can be obtained by repeatedly superposing the additional deflection to the initial deflection in the previous steps. The analytical solution is then determined with the boundary conditions. The superposition-iteration model is thus established. This model was then applied and found to be suitable for real-life engineering applications. During the calculation, the error induced by the ill-conditioned problem of the matrix is easily addressed. The precision of this model is greater compared to previous models. The sensitivity factors and their impact are determined through this superposition-iteration model.

• 대한의생명과학회지
• /
• 제27권2호
• /
• pp.99-104
• /
• 2021

Treatment techniques that affect homeostasis by non-invasive regulation in peripheral organs will advance disease research. Here, we demonstrate a non-invasive method of conditioning within an organ using a low-frequency stimulator superposition of alternating microcurrent wave in stages. It is first applied to the inflammatory response in H3N2-infected sinusitis mice. To check the progress of the treatment, mice were sacrificed every week for 3 weeks, nasal tissue was removed, and the inflammatory response was investigated through H & E staining. The low-frequency stimulation treatment group was found to alleviate the proliferation of epithelial cells and invasion of inflammatory cells compared to the control group as the passage of treatment time. The reduction of inflammatory cytokines in the nasal lavage fluid was observed in H3N2-infected sinusitis mice treated with of low-frequency stimulation using superposition of alternating microcurrent wave compared to H3N2-infected sinusitis mice after 3 weeks. These data demonstrate that low-frequency stimulation device in the form of using alternating current wave superposition on within organs provides a new method to regulate specific physiological functions. Therefore, it is necessary to prove the inhibitory effect of low-frequency stimulation using alternating current wave superposition on inflammatory diseases by various methods through further studies and clinical studies.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2010년도 추계학술대회 논문집
• /
• pp.943-944
• /
• 2010

• 한국지진공학회논문집
• /
• 제3권2호
• /
• pp.87-96
• /
• 1999

시간영역에서의 구조물의 해석은 직접적분법과 모드중첩법에 의하여 구해질 수 있다 그 중에서도 모드중첩법에 의한 해석방법은 몇가지 저차 진동모드를 사용하여 비교적 정확한 해를 구할 수 있기 때문에 동적해석에 널리 사용되고 있다, 그러나 비선형해석에서는 각 부재들의 상태에 따라 강성이 달라지므로 고유 진동모드를 정의할수 없거나 변화되는 강성에 따라 고유진동 모드를 지속적으로 다시 구하여야 하는 불편 있으므로 모드 중첩법을 이용한 비선형해석은 완전탄소성모델 등 극히 제한된 조건에서만 실행이 가능하였다 본논문에서는 강성행렬을 각 부재별로 분리시키고 비선형복원력과 초기선형복언력과 초기선형복원력의 차이를 하중항에 반영시킴으로써 모드중첩법을 이용하여 비선형 해석은완전탄소성모델 등 극히 제한된 조건에서만 실행이 가능하였다 본 논문에서는 강성행렬을 각 부재별로 분리시키고 비선형 복원력과 초기선형복원력의 차이를 하중항에 반영시킴으로써 모드중첩법을 이용하여 비선형해석이 가능한 방법을 제시하고자 한다. 특히 각 부재 강성을 각 부재의 상대변위의 함수로 나타냄으로써 연속적인 계산이 가능하게 하였다 본 논문에서 제시된 방법은 전단보모델에 적용하였으며 모드 개수를 변화시켜 지진하중에 의한 최대변위를 계산하여 이를 직접적분버에 의한 결과와 비교하였다.

• Earthquakes and Structures
• /
• 제4권4호
• /
• pp.341-363
• /
• 2013

Earthquake response calculation, parametric analysis and seismic parameter optimization of base-isolated structures are some critical issues for seismic design of base-isolated structures. To calculate the earthquake responses for such non-symmetric and non-classical damping linear systems and to implement the earthquake resistant design codes, a modified complex mode superposition design response spectrum method is put forward. Furthermore, to do parameter optimization for base-isolation structures, a graphical approach is proposed by analyzing the relationship between the base shear ratio of a seismic base-isolation floor to non-seismic base-isolation one and frequency ratio-damping ratio, as well as the relationship between the seismic base-isolation floor displacement and frequency ratio-damping ratio. In addition, the influences of mode number and site classification on the seismic base-isolation structure and corresponding optimum parameters are investigated. It is demonstrated that the modified complex mode superposition design response spectrum method is more precise and more convenient to engineering applications for utilizing the damping reduction factors and the design response spectrum, and the proposed graphical approach for parameter optimization of seismic base-isolation structures is compendious and feasible.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2000년도 춘계학술대회논문집
• /
• pp.549-555
• /
• 2000

The improved mode superposition methods for non-classically damped systems are presented in this paper. Generally, the mode superposition method uses a relatively small subset of the normal modes of structures. The mode acceleration method and the modal truncation augmentation method improve the results of the mode superposition method by considering effects of truncated high modes. For using these methods to analyze non-classically damped systems, the systems are approximated to the classically damped systems and thereby the errors are induced. In this paper, the mode acceleration method and the modal truncation augmentation method are expanded to analyze the non-classically damped systems. The applicability of the expanded methods is verified by closed form solutions and numerical examples. The expanded modal truncation augmentation method is conditionally stable depending on the pattern of the external loading in the non-classically damped systems whereas the expanded mode acceleration method is stable for the all cases of loading. In the stable case, the results are the same with those of the expanded mode acceleration method.

• 한국공작기계학회논문집
• /
• 제18권2호
• /
• pp.154-161
• /
• 2009

In order to implement continuous-path motion on a robot, it is necessary to blend one joint motion to another joint motion near a via point in a trapezoidal form of joint velocity. First, the velocity superposition using parametric interpolation is proposed. Hybrid motion blending is defined as the blending of different two type's motions such as blending of joint motion with linear motion, in the neighborhood of a via point. Second, hybrid motion blending algorithm is proposed based on velocity superposition using parametric interpolation. By using a 3-axis SCARA (Selective Compliance Assembly Robot Arm) robot with $LabVIEW^{(R)}$ $controller^{(1)}$, the velocity superposition algorithm using parametric interpolation is shown to result in less vibration, compared with PTP(Point- To-Point) motion and Kim's algorithm. Moreover, the hybrid motion $algorithm^{(2)}$ is implemented on the robot using $LabVIEW^{(R)(1)}$ programming, which is confirmed by showing the end-effector path of joint-linear hybrid motion.