• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.448-449
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• 2007

The PMMA plates with periodic ~200 nm nanosized patterned array were fabricated through the nanoimprint technique with their proper Ni stamper. The computer coding was also made with the Mathematica language software via RCWA (Rigorous Continuous Wave Analysis) and it is confirmed that simulation results are in good agreement with the experimental ones.

• 융합보안논문지
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• 제17권2호
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• pp.159-164
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• 2017

국제사회는 북한의 핵 미사일 도발을 실질적인 위협으로 인식하고 있다. 이러한 배경에는 북한의 핵 미사일에 의한 직접적인 공격도 우려되지만, 북한이 핵전자기파(NEMP)탄을 개발했다는 전자기파(EMP)관련 전문가들과 국내외 정보기관들의 분석과 평가가 있기 때문이다. 전자기파 전문가들은 다음과 같은 측면에서 북한의 핵전자기파탄을 우려하고 있다. 우선, 현대사회의 산업 군사 의료 생활시설 등은 전기 전자시스템으로 구축되어 있어, 북한의 핵전자기파탄이 고도에서 폭발한다면 모든 전기 전자기기는 무력화된다. 다음으로, 공격자의 입장에서 핵전자기파탄은 상대국의 전기 전자기기 시설만을 파괴하고, 인명을 살상하지 않기 때문에 국제사회의 비난가능성이 낮다는 판단을 할 수 있다. 마지막으로, 핵전자기파탄은 목표물을 정확하게 타격할 필요가 없고, 저급한 핵무기의 수준으로 광범위한 지역을 타격할 수 있기 때문에 대량살상무기(WMD)보다 더 위협적이라 할 수 있다. 이러한 측면에서 북한의 핵 미사일 개발에 대한 분석과 평가를 통하여, 북한의 핵전자기파탄 개발에 대한 전망을 하고자 한다.

• 한국자동차공학회논문집
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• 제14권5호
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• pp.107-114
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• 2006

This paper investigates the radiating source of electro-magnetic waves in the cabin of automobile with spark ignition engine. Front seats are very close to the engine room where electro-magnetic waves are expected to be radiating. But front seat area is believed to be a blind zone, which is not affected by radiating electro-magnetic waves, because a bulk board and floor board shield the front seat area. The level and frequency spectrum of electro-magnetic waves are measured at the passenger seat and the engine room. The measured frequency range is $145{\sim}365MHz$. As a results, the level of the electro-magnetic waves of automatic transmission vehicle is greater than -82dBm. The shapes of frequency spectrum of both engine room and passenger seat are look alike. But the level of electro-magnetic waves of manual transmission vehicle is less than -82dBm and the shapes of frequency spectrum of engine room and passenger seat are different to each other. From these results, we can say that any mal-function caused by electro-magnetic waves in the automobile cabin are only possible for automatic transmission vehicle. Also, it is believed that the radiating source of electro-magnetic waves is inside the vehicle. Thus, based on the transmission line theory, this paper presumably concludes that the cables which connect all the components inside a automatic transmission vehicle must be a radiating source of electro-magnetic waves in the cabin.

• 콘크리트학회논문집
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• 제11권6호
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• pp.79-88
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• 1999

In this paper, the electro-deposition method for the rehabilitation of cracked concrete, based on the electro-chemical technique, is presented. The main purpose of this paper is to apply this technique to reinforced concrete members on land. After cracking with a specified load(crack width 0.5mm), 10$\times$10$\times$20cm concrete specimens with embedded steel bars were immersed in several solutions, then a constant current density between the embedded steel in concrete and an electrode in the solution was applied for 4~20 weeks. The results indicate that electro-deposits formed in this process are able to close concrete cracks and to coat the concrete surface and that formation of these electro-deposits is confirmed to have an effect of protection against detrimental materials. Therefore, it is demonstrated that the electro-deposition method can be usefully applied for the rehabilitation technique of concrete.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.532-534
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• 2008

LCD TV용 Backlight Unit을 구동하는 Inverter 및 SMPS용 IC의 발진기(OSC)는 구동 주파수를 결정하는 블록이다. 종래에는 미리 결정된 전류값과 충방전용 시정수에 의하여 스위칭 주파수가 고정 되어 있다. 이에 반하여 외부에서 스위칭 주파수를 가변하고자 할 때, 신호의 입력에 따라 스위칭 주파수가 가변 가능한 발진기(Oscillator) 블록을 제안한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 추계학술대회 논문집
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• pp.613-614
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• 2006

• 동력기계공학회지
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• 제15권6호
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• pp.86-94
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• 2011

In this paper, an electro hydraulic power steering system based on electro hydrostatic actuator (EHA) is proposed. A detailed steering model for the proposed electro hydraulic power steering system including mechanical and hydraulic subsystems is established. A conventional electro hydraulic power steering system is also modeled to evaluate the performance of the proposed power steering system such as responsiveness, assist force, command tracking and steering feel by computer simulation. From the computer simulation results, it is found that the proposed power steering system based on EHA has desirable performance.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.374-377
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• 2009

The characteristics of the deposited thin films of the zinc oxide (ZnO) at different oxygen pressures will be elucidated in this work. The resistivity of ZnO thin films were dominated by the carrier concentration under high oxygen pressure conditions while controlled by the carrier mobility at low oxygen ambiences. In addition, we will show the characteristics of the transparent ZnO based thin film transistor (TFT) fabricated at a full room temperature process with gate dielectric of gadolinium oxide ($Gd_2O_3$) thin films.

• 열처리공학회지
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• 제33권6호
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• pp.290-295
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• 2020

In this study, Electro spinning was carried out using Cabon nanotube 0.1%-Polyacrylonitrile 3%-Dimethylformamide 17% agitation solution. It was investigated the solute and solvent correlations according to the electro spinning voltages ranging form 5 to 40 kV, based on the SEM image. Except voltage 25 kV, electro spinning was failed due to the lack of electro spinning (less than 60%). Voltage 25 kV was showed excellent properties, and was confirmed Cabon nanotube 58.1 nm and diameter of Cabon nanotube + Polyacrylonitrile 1.76 ㎛ as shown SEM image. Also, the tensile test results were showed that SK Chemical prepreg electro spinning angle of 0 and 90 degrees were 137 MPa and 60 MPa, respectively.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.1097-1100
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• 2001

In this paper, the electro-chemical-machining characteristics of Ni-Ti Shape Memory Alloy(SMA) was investigated. From the experimental results, the optimal electro chemical machining conditions for satisfying the machining quality(fine surface & high recovery stress) might be confirmed. And it was concluded that optical electro chemical condition for Ni-Ti SMA could be obtained at approximately 100% current efficiency and high frequency pulse current.