• Journal of the Optical Society of Korea
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• 제16권4호
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• pp.325-330
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• 2012

Differential absorption LIDAR (DIAL) is frequently used for atmospheric gas monitoring to detect impurities such as nitrogen dioxide, sulfur dioxide, iodine, and ozone. However, large differences in the on- and off-line laser wavelengths can cause serious errors owing to differential aerosol scattering. To resolve this problem, we have developed a new DIAL system for iodine vapor measurements in particular. The suggested DIAL system uses only one laser under seeded and unseeded conditions. To check the detection-sensitivity and error effects, we compared the results from a system using two seeded lasers with those from a system using a seeded and an unseeded laser. We demonstrate that the iodine concentration sensitivity of our system is improved in comparison to the conventional two seeded or two unseeded laser combinations.

• 한국광학회지
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• 제7권3호
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• pp.238-243
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• 1996

XeCl 레이저로 펌핑하는 쌍공진기 색소레이저와 2단 증폭시스템을 개발하여 DIAL시스템에 적합한 두개의 파장을 동시 또는 순차적으로 출력하였다. 개발된 쌍공진기는 1200g/mm의 회절격자를 갖는 grazing-incidence 방법에서 제1차 및 제2차 회절차수를 이용하여 구성되었다. 출력특성은 스펙트럼 선폭이 10pm이하이고 펌프 에너지에 대한 전체효율은 6% 이상이다. 또한, 파장가변 영역은 제1차 및 제2차의 회절차수에 대해 각각 434-470nm, 436-468nm이며 2단의 증폭기의 증폭이득은 37dB, 추출효율은 9%이다. 개발된 레이저 증폭시스템에서 Coumarine-450의 색소로 발진하고 이의 출력 6mJ을 DIAL 시스템의 레이저 광으로 전송하여 수원 상공의 NO$_{2}$가스 농도분포를 측정하였다. 이 결과 개발된 색소레이저 시스템은 DIAL의 레이저 광원으로 매우 적합함을 확인하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 추계종합학술대회
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• pp.423-427
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• 2003

In this paper, we have investigated the output characteristics of the Stokes Raman laser in hydrogen, deuterium, and their mixed gases as a function of the incident pump energy and gas pressure using KrF excimer laser as pumping source for generating the differential absorption lidar (DIAL) wavelengths suitable in measuring the ozone concentration of the troposphere. The optimization results of compact excimer-Raman laser transmitter in DIAL system for the tropospheric ozone sounding at the 292 nm/319 m and 292 nm/313 nm wavelength pairs are presented. for the ozone sounding in the 4-12 km range, it has been demonstrated that the design of transmitter for DIAL lidar may be significantly simplified by the use of 292 nm/319 nm wavelength pair. The investigations of Raman scattering in the mixture of hydrogen and deuterium gases have shown that such mixture may be efficiently used for developing the multi- wavelength light sources for DIAL systems.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 3부
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• pp.25-29
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• 2008

기존의 가상 시작품은 3D 그래픽스를 이용하여 모델링된 제품 영상을 제공하였다. 이러한 가상 시작품은 단지 전통적인 입력 장치인 키보드와 마우스를 이용하여 다룰 수 있을 뿐, 조작부를 사용자가 직접 만져보고 조작하는 것은 불가능했다. 본 논문에서는 사용자가 실제 제품을 조작하는 듯한 느낌을 얻을 수 있도록 하는, 실감가상시작을 위한 햅틱 다이얼을 시스템을 제안한다. 햅틱 다이얼은 모터를 통해 사용자가 실제의 기계적인 다이얼과 유사한 감을 느낄 수 있도록 제어된다. 또한, 사용자가 다이얼을 조작하는 정보는 시스템에 입력되어 가상시작품이 작동하는 모습을 화면상에서 확인할 수 있도록 하였다. 이러한 실감 가상시작 시스템은 사용자 피드백을 통해, 설계 프로세스 초기 단계에서부터 제품 인터페이스를 디자인할 수 있도록 도움을 줄 것이다.

• 한국광학회:학술대회논문집
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• 한국광학회 1998년도 제15회 광학 및 양자전자 학술발표회 논문집
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• pp.134-135
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• 1998

• 한국CDE학회논문집
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• 제15권3호
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• pp.222-233
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• 2010

Developed in this research is a TP (tangible prototyping) system, which consists of two modules; (1) a virtual reality model to evaluate the functions and appearance of the product, and (2) a haptic device to emulate tactile and kinesthetic properties of mechanical dial knobs. As an example, a washing machine is modeled using a commercial CAD system and transformed in VRML and X3D formats. Some dynamic behaviors and kinematic characteristics are programmed using X3D script and Java. Various haptic behaviors of the dial are generated by modulating torque profile according to the rotation angle. A torque profile measuring system is developed to evaluate the behaviors of the haptic dial physically. Haptic sensibility evaluations are accomplished using the TP by semantic differential method.

• 항공우주시스템공학회지
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• 제15권4호
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• pp.1-6
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• 2021

The non-explosive holding and release mechanism is used to prevent damage to the mission component caused by explosives when the deployment structure for Cube Satellites is separated. However, among the several types available, the non-explosive holding and release mechanism system using nylon wires depend on the nylon wire knot method and tightening power of the worker. Therefore, in this study, we conducted experiments with the operation of a new holding and release mechanism system by conceptualizing the Boa System Dial, which can provide a constant tightening force regardless of worker proficiency and deploying a imitational solar panel. In this study, the process of binding and unbinding with constant tension was recorded while applying the novel non-explosive holding and release mechanism using the Boa System Dial proposed. In addition, required advances are indicated for the application of the proposed system to actual Cube Satellites.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제53권5호
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• pp.305-308
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• 2004

The 7-dial inductive voltage divider(IVD) for application at low frequency range which can precisely divide the in put voltage up to resolution of $10^{-7}$ was fabricated by using the toroidal cores made by super-mumetal strips of 0.025 mm thick and special decade switches. The cores have the initial permeability of 200.000 and magnetic flux density of 0.5 T. The inphase and quadrature ratio errors for a fabricated 7-dial IVD are found to be less than $\pm$4${\times}$$10^{-7}$ and $\pm$5${\times}$$10^{-6}$ rad(k=2), respectively. by calibration using the IVD calibration system of KRISS. The fabrication techniques used and uncertainty evaluation are discussed in this paper.

• 산업경영시스템학회지
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• 제5권7호
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• pp.43-48
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• 1982

As the result of processing improvement of Telephone Dial by substituting. Synthetic Resin for metalic materials, improved characteristics of quality can be gained as follow. 1. By the improvement of structure and assembling of the Telephone Dial, the complex process of manufacture can be a simplified one, and at the same time the working process can be done in the form of assembly. 2. In the efficiency test of the Telephone Dial, the noise decreases by 5% compared with the first test. In the test of life and environment, it accords with the standard of the Ministry of Communications and its function betters. 3. By using synthetic resins instead of metalic materials the cost can be reduced by \340 than the first improvement and it also brings the heightend value.

• 한국통신학회논문지
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• 제9권2호
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• pp.94-102
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• 1984

UNIX system사이에 file transfer, remote command execution, mail transfer등의 기능을 갖는 UUCP에 대한 설명, SDN(System Development Network)에 설치하는 과정, USENET와 EUNET같은 해외 네트워크와의 연결 등에 대해 기술한다.