• Current Optics and Photonics
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• 제8권1호
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• pp.72-79
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• 2024

Recent flat-panel displays have become increasingly complicated to facilitate multiple display functions. In particular, the form of multilayered architectures for next-generation displays makes precise three-dimensional alignment of multiple panels a challenge. In this paper, a diffractive optical alignment marker is proposed to address the problem of three-dimensional alignment of distant dual panels beyond the depth-of-focus of a vision camera. The diffractive marker is effective to analyze the positional correlation of distant dual panels. The possibility of diffractive alignment in multilayer display fabrication is testified with numerical simulation and a proof-of-concept experiment.

• Current Optics and Photonics
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• 제8권2호
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• pp.170-182
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• 2024

The dimensional accuracy and consistency of a dual oil circuit centrifugal fuel nozzle are important for fuel distribution and combustion efficiency in an engine combustion chamber. A point cloud measurement method was proposed to solve the geometric accuracy detection problem for the fuel nozzle. An improved variance focus measure operator was used to extract the depth point cloud. Compared with other traditional sharpness evaluation functions, the improved operator can generate the best evaluation curve, and has the least noise and the shortest calculation time. The experimental results of point cloud slicing measurement show that the best window size is 24 × 24 pixels. In the height measurement experiment of the standard sample block, the relative error is 2.32%, and in the fuel nozzle cone angle measurement experiment, the relative error is 2.46%, which can meet the high precision requirements of a dual oil circuit centrifugal fuel nozzle.

• 대한수학회보
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• 제60권3호
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• pp.561-574
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• 2023

In this paper, we focus on establishing the MacWilliams-type identities on vectorial Boolean functions with bent component functions. As their applications, we provide a bound for the non-existence of vectorial dual-bent functions with prescribed minimum degree, and several Gleason-type theorems are presented as well.

• Clinical Endoscopy
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• 제56권4호
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• pp.455-456
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• 2023

• 대한가정학회지
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• 제48권5호
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• pp.145-155
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• 2010

The purpose of this study is to develop childcare service program through the analysis of the market and the needs of current users. For the purpose of this study, qualitative data were collected by use of an in-depth interview with staffs of Healthy Family-Support Center and outside experts. In addition, information about the chilldcare service market was analyzed. At present, a lot of childcare services are offered by both government sector and private sector institutions, but there is both an overlapping and a gap in the services offered. Based on our data, childcare service was suggested for dual income families with elementary school children. And the curriculum to train individuals for this childcarer service program was developed. The curriculum's focus was to nurture them to offer more specialized and custom-tailored services.

• International Journal of Computer Science & Network Security
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• 제23권4호
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• pp.39-47
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• 2023

This study compares various transformation techniques for multifocus image fusion. Multi-focus image fusion is a procedure of merging multiple images captured at unalike focus distances to produce a single composite image with improved sharpness and clarity. In this research, the purpose is to compare different popular frequency domain approaches for multi-focus image fusion, such as Discrete Wavelet Transforms (DWT), Stationary Wavelet Transforms (SWT), DCT-based Laplacian Pyramid (DCT-LP), Discrete Cosine Harmonic Wavelet Transform (DC-HWT), and Dual-Tree Complex Wavelet Transform (DT-CWT). The objective is to increase the understanding of these transformation techniques and how they can be utilized in conjunction with one another. The analysis will evaluate the 10 most crucial parameters and highlight the unique features of each method. The results will help determine which transformation technique is the best for multi-focus image fusion applications. Based on the visual and statistical analysis, it is suggested that the DCT-LP is the most appropriate technique, but the results also provide valuable insights into choosing the right approach.

• 한국산학기술학회논문지
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• 제22권1호
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• pp.728-742
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• 2021

본 연구의 목적은 기존의 순기능 측면을 중심으로 연구되었던 잡크래프팅(job crafting)을 역기능 측면도 함께 탐색하기 위해 잡크래프팅을 향상초점(promotion focus)과 예방초점(prevention focus)으로 나누어 두 초점이 이직의도에 미치는 차별적 영향과 그 과정을 밝히는 것이다. 구체적으로 향상초점 잡크래프팅과 예방초점 잡크래프팅이 업무 통합성과 직무 긴장을 매개하여 이직 의도에 영향을 미친다는 순차적 이중매개모형을 제안하였다. 또한 예방초점 잡크래프팅의 역기능을 줄일 수 있는 변인으로 상사지지에 대한 조절효과 여부를 확인하고자 하였다. 이를 위해 국내 다양한 직종의 현직자 293명을 대상으로 온라인 설문조사를 실시하였다. 분석결과 향상초점 잡크래프팅은 이직의도에 부적 영향을 미친 반면, 예방초점 잡크래프팅은 직접적으로 정적 영향을 미쳤다. 향상초점 잡크래프팅과 예방초점 잡크래프팅 모두 업무통합성과 직무 긴장을 순차적으로 부분 매개하여 간접적으로도 영향을 미치는 것으로 나타나 순차적 이중매개모형을 검증하였다. 또한, 상사지지는 예방초점 잡크래프팅이 업무통합성에 미치는 부정적 영향을 완화하고 두 변인의 관계를 정적으로 변화시켜 상사지지의 조절효과가 입증되었다. 이를 바탕으로 본 연구의 시사점과 향후 연구 방향을 논의하였다.

• Journal of Mechanical Science and Technology
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• 제16권12호
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• pp.1664-1672
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• 2002

Gantry mechanisms have been widely used for precision manufacturing and material handling in electronics, nuclear, and automotive industries. Dual-drive servo mechanism is a way to increase control bandwidth, in which two primary axes aligned in parallel are synchronously driven by identical servo motors. With this mechanism, a flexible coupling (compliance mechanism) is often introduced in order to avoid the damage by the servo mismatch between the primary drives located at each side of gantry. This paper describes the design guidelines of the dual-drive servo mechanism with focus on its dynamic characteristics and control ramifications. That is, the effect on the system bandwidth which is critical on the system performance, the errors and torques exerted on guide ways in case of servo mismatch, the vibration characteristics concerned with dynamic error and settling time, and the driving force required at each axis for control are thoroughly investigated.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.664-669
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• 2003

This paper proposes a swing-arm type dual-stage actuator, which consists of a PZT actuator for fine motion and a VCM(Voice Coil Motor) for coarse motion, for SFF ODD(Small Form Factor Optical Disk Drive), in order to achieve fast access speed and precise track following control. We focus our attention on the design and control of the PZT actuator, because there have been a lot of previous researches related to the VCM and dual-stage actuators. Due to the dual cantilever structure, the PZT actuator can generate precise translational tracking motion at its tip where optical pickup is attached at, and the effect of hysteric behavior of the PZT element is reduced. The dynamic model of the PZT actuator is derived by using the Hamilton's principle, and verified by comparing with the experimental frequency response. The sliding mode control is designed in order to be robust against modeling uncertainties. Simulations and experimental results confirm the effectiveness of the suggested control scheme.

• Industrial Engineering and Management Systems
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• 제9권1호
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• pp.28-40
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• 2010

One of the most important objectives of the schedules in a container terminal is to minimize the ship operation time, which consists of discharging and loading operation times. Recently, dual cycling techniques have been used for improving terminal operations, especially for reducing the total empty trips of handling equipment. The main focus of this study is to reduce the empty trip times of yard trucks with minimum delays for ship operations. A heuristic algorithm, modified from a previous algorithm, is proposed to solve this problem. A simulation study is conducted to evaluate the effect of different types of discharging and loading schedules and different locating methods for discharging containers in terms of the performance of the system, including the percentage of the dual cycle operations of yard trucks.