• 전기학회논문지
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• 제60권4호
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• pp.880-884
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• 2011

The matrix-type superconducting fault current limiter (MSFCL) consists of the trigger and current-limiting parts. The trigger part with reactors connected in parallel improves the quenching characteristics by applying the external magnetic field into the superconducting units. The current-limiting part with superconducting units connected in parallel and shunt reactors connected in series limit the fault current when the fault occurs. We developed the integrated reactor with the trigger and the current-limiting parts to apply high external magnetic field into the superconducting units. This was composed of a superconducting unit for the trigger part and two superconducting units for the current-limiting parts. We confirmed that the external magnetic field generated in the MSFCL with an integrated reactor was larger than that of the MSFCL with the separated reactors. So the differences of voltages generated between superconducting units were decreased in the difference according to the increment of the applied voltage. The whole magnitude of the SFCL was reduced because the volume of an integrated reactor could be reduced by one-third than that of the separated reactors. We confirmed that the critical behavior between the superconducting units in the MSFCL with an integrated reactor was more improved than that of the MSFCL with the separated reactors.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2004년도 요약집 춘계학술발표대회
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• pp.171.2-171.2
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• 2004

• Physical Therapy Rehabilitation Science
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• 제11권2호
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• pp.269-278
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• 2022

Objective: The aim of this study was to evaluate the effects on pain and function of patients with rotator cuff tendinopathy when applying trigger point of infraspinatus and teres minor to myofascial trigger point release (MFR) plus mobility exercise and MFR. Design: A randomized controlled trial. Methods: The total participants were 30patients and were separated to MFR plus mobility exercise group(n=15) and MFR group (n=15) according to the randomized treatment method. The MFR was performed at two infraspinatus tampon points and one teres minor tampon point for twice a week for 4 weeks and the treatment time was 6 minutes 20 seconds in each position. The MFR group also carried out the myofascial trigger point release in the same way as the MFR plus mobility exercise group. Results: The MFR plus mobility exercise group significantly reduced objective and subjective pain (p<0.05). The range of motion of the shoulder joint flexion and external rotation, Quick-Disability of the Arm, shoulder and Hand, and Shoulder Pain and Disability Index were significantly improved in the group to which MFR plus mobility exercise was applied (p<0.05). Conclusions: These results confirmed that MRF plus mobility exercise is more effective in relieving shoulder pain and improving function in rotator cuff tendinopathy.

• 한국정보전자통신기술학회논문지
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• 제12권2호
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• pp.150-154
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• 2019

In the design of semiconductor integrated circuits, ESD is one of the important issues related to product quality improvement and reliability. In particular, as the process progresses and the thickness of the gate oxide film decreases, ESD is recognized as an important problem of integrated circuit design. Many ESD protection circuits have been studied to solve such ESD problems. In addition, the proposed device can modify the existing SCR structure without adding external circuit to effectively protect the gate oxide of the internal circuit by low trigger voltage, and prevent the undesired latch-up phenomenon in the steady state with high holding voltage. In this paper, SCR-based novel ESD(Electro-Static Discharge) device with the high holding voltage has been proposed. The proposed device has the lower triggering voltage without an external trigger circuitry and the high holding voltage to prevent latch-up phenomenon during the normal condition. Using TCAD simulation results, not only the design factors that influence the holding voltage, but also comparison of conventional ESD protection device(ggNMOS, SCR), are explained. The proposed device was fabricated using 0.35um BCD process and was measured electrical characteristic and robustness. In the result, the proposed device has triggering voltage of 13.1V and holding voltage of 11.4V and HBM 5kV, MM 250V ESD robustness.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 D
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• pp.2039-2040
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• 2006

Persistent current switch (PCS) system in NMR, MRI, MAGLEV and SMES has many advantages, such as uniformity and durability of magnetic field and reducing a thermal loss, which enable many superconducting application to operate effectively. This paper deals with fabrication and test of heater trigger persistent current switch using coated conductor (CC) which has high n-index, critical current independency from external magnetic field and adaptable selectivity of stabilizer. PCS system consists of magnet power supply for energizing current to a magnet, heater, switch and magnet using coated conductor tape. Finite element method (FEM) is used to simulate thermal quench (switching) characteristic and design heater trigger. With FEM simulation, optimal length of heater is calculated by temperature and time analysis. Fabrication of PCS system and test of heater trigger characteristic were performed and compared with simulation result. This paper would be the foundation of researches of superconducting switching application.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.2210-2211
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• 2008

In this paper, we investigated the quenching characteristics of a superconducting fault current limiter (SFCL) with connection of $2{\times}3$ matrixes. This SFCL consists of the trigger part to apply magnetic field and the current-limiting part to limit the fault current. When the fault occurs, the magnetic field generated in the reactor connected in parallel was applied to the two superconducting units of the current-limiting part to reduce of inhomogeneous critical current behavior between the superconducting units. The quenching behavior of a superconducting unit in the trigger part was affected by the increase of turn numbers. This is because of the difference of current distribution between the inductance of the reactors and the resistance generated in the superconducting units in trigger part. We confirmed that the voltage differences between two superconducting units of the current-limiting part were decreased. This is because of the improvement of inhomogeneous critical current behavior between the superconducting units according to the increase of external magnetic field.

• 전기전자학회논문지
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• 제25권3호
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• pp.485-492
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• 2021

본 논문에서는 다각형 용기의 결함 검사 시스템 개발을 제안한다. 임베디드 보드는 메인부, 통신부, 입·출력부 등으로 구성된다. 메인부는 주 연산장치로써 임베디드 보드를 구동하는 운영체제가 포팅되어서 외부 통신, 센서 및 제어를 위한 입출력을 제어할 수 있다. 입·출력부는 필드에 설치되어 있는 센서들의 전기적신호를 디지털로 변환하여 메인모듈로 전달하는 역할 및 외부 스텝 모터 제어의 역활을 한다. 통신부는 영상 촬영 카메라 트리거 설정 및 제어 장치의 구동 설정의 역할을 수행한다. 입·출력부는 제어 스위치 및 센서들의 전기적신호를 디지털로 변환하여 메인모듈로 전달하는 역할을 수행한다. 동작 모드 등과 관련한 펄스 입력 등을 받기 위한 입력회로에는 외부 노이즈의 간섭을 최소화하기 위하여 각 입력포트에는 포토커플러를 설계한다. 제안된 다각형 용기의 결함 검사 시스템 개발의 정확성을 객관적으로 평가하기 위하여 다른 머신비전 검사 시스템과 비교를 해야 하지만, 현재 다각형 용기의 머신비전 검사 시스템이 존재하지 않기 때문에 불가능하다. 따라서, 동작 타이밍을 오실로스코프로 측정하여서 Test Time, One Angle Pulse Value, One Pulse Time, Camera Trigger Pulse, BLU 밝기 제어 등과 같은 파형이 정확히 출력됨을 확인하였다.

• 한국군사과학기술학회지
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• 제21권4호
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• pp.456-463
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• 2018

With the development of weapon systems by mounting various sensors, it makes important to analyze the precise functioning of sensor to external environment. In the case of small arms with magnetic sensor, the malfunction of small arms might be caused by strong external magnetic fields. In this study, the effects of magnetic sensor on external magnetic fields were analyzed, and optimal magnetic shield and shield structure were designed through M&S. In addition, the magnetic-shielding effectiveness of magnetic sensor in small arms was verified with commercial shielding materials. As a result, it was demonstrated that the Fe-Cu-Si-Nd-B with the structure of multi-layer metallic shields was shown the magnetic-shielding effectiveness of 83 % for an external permanent magnet and 19 % for an alternating magnetic field of 180 dBpT at 60 Hz, respectively.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1228-1230
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• 2005

This paper deals with design of heater trigger switching in a persistent current system(PCS) by finite element method(FEM) analysis of YBCO coated conductor(CC) tape. Most promising superconducting wire is YBCO coated conductor tape in these days for its high n value and critical current independency from external magnetic field. It is expected to be used many superconducting application such as fault current limiter and cable etc. The superconducting magnet which is operated in persistent current mode in SMES, NMR, MRI and MAGLEV has many advantages such as a high uniformity of a magnetic field and reducing a thermal loss. A PCS system consists of magnet power supply (MPS) which energized current to a magnet, heater, a coated conductor tape for switching, and superconducting magnet. In this paper, the characteristic of thermal quench of the YBCO CC tape and BSCCO tape by heater trigger analyzed by FEM. And optimal length of heater is calculated by temperature and time analysis. This heater trigger analysis is expected to be a basic concept of PCS application design.

• 한국콘텐츠학회논문지
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• 제11권2호
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• pp.312-321
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• 2011

현재 신제품 출시전에 인터넷 상에서 출시 전 제품에 대한 커뮤니케이션 활동인 프리어나운싱 활동이 활발하게 시행되고 있다. 특히 이러한 프리어나운싱 관련 정보들은 제품 관련 인터넷 커뮤니티에서 확산 되어지는 상황이다. 이에 본 연구는 신제품의 프리어나운싱 맥락에서 인터넷상에서의 신제품의 프리어나운싱 활동이 인터넷 유저들의 e-WOM(electronic word-of-mouth)에 미치는 영향을 살펴보고자 한다. 더욱이 현재 인터넷 커뮤니티 상에서 e-WOM 활동은 블로그, 트위터 등으로의 포스팅으로 연계되어 구전활동이 가속화되고 있는 상황에서 이러한 인터넷상에서의 포스팅 의도에 대한 신제품정보의 생동감의 영향을 살펴보면서, 특히 정보의 생동감을 외적인 생동감과 내적인 생동감의 차원으로 그 영향을 고찰하고자 한다. 연구 결과 신제품 정보의 외적인 생동감과 내적인 생동감이 인터넷 커뮤니티 e-WOM에 긍정적으로 영향을 미치고 있으며, 또한 인터넷 커뮤니티 내 e-WOM는 유저들의 웹포스팅의도에 긍정적인 영향을 미치는 것으로 나타났다.