• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.19-21
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• 2008

The purpose of this paper is the optimal design of a single-phase LSPM(Line-Start Permanent Magnet Motor). A single-phase LSPM has a permanent magnet in the rotor that is same as induction motor. For that reason, magnet is operated by breaking torque in starting region and alignment torque in driving region. Therefore, we need the design process considering the trade-off relationship. In this paper, we propose the design process of a single-phase LSPM for a high starting torque and efficiency with equivalent circuit and FEM. And we use Taguchi Method for considering tolerance in manufacture. Finally, we compared the LSPM that is designed in this paper and conventional induction motor.

• 조명전기설비학회논문지
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• 제28권1호
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• pp.29-35
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• 2014

The purpose of this paper is the rotor design of a single-phase LSPM(Line-start permanent magnet) motor. A single-phase LSPM motor has a permanent magnet in the rotor that is same as induction motor. For that reason, magnet is operated by breaking torque in starting region and alignment torque in driving region. Therefore, we need the design process considering the trade-off relationship. In this paper, we propose the design process of a single-phase LSPM motor for a high starting torque and efficiency with FEM. And we use Taguchi Method for considering tolerance in manufacture. Finally, we compared the LSPM motor that is designed in this paper and conventional induction motor.

• Current Optics and Photonics
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• 제5권2호
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• pp.134-140
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• 2021

In this paper, I introduce a novel design method of a high performance nanophotonic beam deflector providing broadband operation, large active tunability, and signal efficiency, simultaneously. By combining thermo-optically tunable vanadium dioxide nano-ridges and a metallic mirror, reconfigurable local optical phase of reflected diffraction beams can be engineered in a desired manner over broad bandwidth. The active metagrating deflectors are systematically designed for tunable deflection of reflection beams according to the thermal phase-change of vanadium dioxide nano-ridges. Moreover, by multiplexing the phase-change supercells, a robust design of actively tunable beam splitter is also verified numerically. It is expected that the proposed intuitive and simple design method would contribute to development of next-generation optical interconnects and spatial light modulators with high performances. The author also envisions that this study would be fruitful for modern holographic displays and three-dimensional depth sensing technologies.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.376-385
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• 2007

Construction project is necessary element for human life to upgrade the quality and convenience. However, due to its contradictory nature to the environment preservation, environmental pollution and damage, deterioration of natural scenery, noise/vibration, water quality pollution, etc. caused in the process of construction greatly affect the environment. For the building or construction project, its possible impact on environment during construction work and after completion must be predicted at its design phase, which will result in the completion of the architecture convenient for human being with its environmental pollution reduced to minimum level. In this study, the checklist of environmental factors was suggested, which should be taken into account at its design phase in conducting the construction work. Proposed checklist was linked with the developed web-based system for the convenience of users like designer and construction manager, etc. It is expected that the checklist suggested by this study will help the designer and construction manager to continue the steady development from the environmental viewpoint during the design phase.

• International Journal of Aeronautical and Space Sciences
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• 제16권3호
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• pp.370-379
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• 2015

Handling constantly evolving configurations of aircraft can be inefficient and frustrating to design engineers, especially true in the early design phase when many design parameters are changeable throughout trade-off studies. In this paper, a physics-based design framework using parametric modeling is introduced, which is designated as DIAMOND/AIRCRAFT and developed for structural design of transport aircraft in the conceptual and preliminary design phase. DIAMOND/AIRCRAFT can relieve the burden of labor-intensive and time-consuming configuration changes with powerful parametric modeling techniques that can manipulate ever-changing geometric parameters for external layout of design alternatives. Furthermore, the design framework is capable of generating FE model in an automated fashion based on the internal structural layout, basically a set of design parameters describing the structural members in terms of their physical properties such as location, spacing and quantities. The design framework performs structural sizing using the FE model including both primary and secondary structural levels. This physics-based approach improves the accuracy of weight estimation significantly as compared with empirical methods. In this study, combining a physics-based model with parameter modeling techniques delivers a high-fidelity design framework, remarkably expediting otherwise slow and tedious design process of the early design phase.

• 시스템엔지니어링학술지
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• 제14권1호
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• pp.72-82
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• 2018

Generally speaking, because of complexity of engineering process, the systems engineering may be not easy to understand clearly and not easy to perform also. The status of systems engineering infrastructure of the some Korean industry is not matured yet, i.e., the systems engineering process, method, tool and environment is not implemented consistently within the steel making industry. These difficulties are more severe at the concept and basic design phase than the detail design phase relatively. Korean industry has lots of development project for the precedented systems and usually has matured domain knowledge for the precedented systems. Even though there is a mature domain knowledge of the precedented systems, the development project will lead to failure under the condition of engineering system is not well equipped. For the project success, it is very important to have a proper engineering execution system especially for the concept design and basic phase, which has a high abstraction and a large influence on the whole project. This paper proposes a minimized design process that can be easily applied to the concept and basic design phase of the precedented systems, instead of complex system engineering processes. This paper also proposes the application case of the minimized design process and methods for a Blast Furnace System.

• 한국전자파학회논문지
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• 제19권5호
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• pp.541-546
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• 2008

본 논문에서는 마이크로스트립 선로를 이용하여 구조가 간단하고 광대역 특성을 갖는 $90^{\circ}$ 위상 변이기를 설계하고 LTCC 공정을 이용하여 제작하였다. 이 위상 변이기는 두 개의 한 쪽 끝이 접지된 $90^{\circ}$ 전송 선로 사이에 $180^{\circ}$ 전송 선로를 연결한 구조를 갖는다. 각 선로의 어드미턴스 행렬을 결합하여 제안된 $90^{\circ}$ 위상 변이기에 대한 설계 공식을 유도하고, 이를 적용하여 중심 주파수 5.75 GHz에서 대역폭 4.2 GHz, ${\pm}2^{\circ}$의 위상 편차를 갖는 광대역 $90^{\circ}$ 위상 변이기를 설계, 제작하였다.

• 한국컴퓨터산업학회논문지
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• 제5권2호
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• pp.261-268
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• 2004

본 연구는 다기능의 광 네트워크에 있어서 256 위상 Opto-ULSI 프로세서를 구현하는 최적위상 디자인을 제안한다. 이미 구성된 8 위상 프로세서에 대한 디자인의 실험 특성을 바탕으로 하여 본 연구에서 액정의 비선형성을 보정하며 최적의 위상을 찾아 대용량의 Opto-ULSI 프로세서를 구현할 수 있다. 이 연구는 최적의 위상 특성을 조사하고 액정의 비선형성 보정방법에 대한 개발을 통해 초기의 8 위상 Opto-ULSI 프로세서 개발을 중심으로 통합된 지능형 포토닉스 시스템 (IIPS)을 위한 광선제어 Opto-ULSI (BS) 프로세서 (OUP) 구현을 목표로 한다.

• 한국전자통신학회논문지
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• 제3권3호
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• pp.158-164
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• 2008

본 논문은 다중기능 광 네트워크에 있어서 256위상 광 ULSI 프로세서를 구현하기 위한 최적위상 도출에 관해 연구한다. 이미 구성된 8위상 프로세서를 실험 및 평가를 위한 기반으로 사용한다. 이 연구에서는 액정의 비선형성을 상쇄시킬 수 있는 최적의 위상을 찾아내어 보다 큰 규모의 광 ULSI 프로세서 구현이 가능하게 한다. 이는 집적화된 지능형 광자유도 시스템(IIPS)에 사용되는 빔 조종 8위상 광 ULSI 프로세서에 기초하여 구현 된다.

• 한국항행학회논문지
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• 제18권4호
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• pp.341-346
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• 2014

본 논문은 6.0~18.0 GHz 대역에서 동작하는 광대역 디지털 주파수 변별기(DFD, digital frequency discriminator)의 위상 상관기(phase correlator)를 설계하고 제작하였으며, 제작된 DFD 위상 상관기의 I와 Q 신호를 측정하고, 주파수 변별 오차를 분석하였다. 믹서형 위상 상관기의 동작 특성에 대한 해석적 관계식을 유도하였으며, 위상 상관기에 포함되는 IQ 믹서(mixer)와 8-way 전력분배기(power divider)는 RF 시뮬레이션 툴(tool)을 이용하여 모델링하였다. 설계된 위상 상관기는 제작되어 측정하였다. 제작된 위상 상관기의 I와 Q 출력신호를 측정하여 제시하였으며, 측정된 I와 Q 출력신호를 이용하여 위상오차(phase error)와 주파수 변별오차(frequency discrimination error)를 나타내었다. 위상 상관기의 평균 위상오차(phase error)는 $4.81^{\circ}$, RMS(root mean square)이고, 주파수 변별 오차는 1.49 MHz, RMS 이다.