• The Optical Journal
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• s.102
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• pp.49-51
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• 2006

광학계에서 23년간의 풍부한 연구실적과 현장경험을 축적한 정진호 소장을 구심점으로‘프로들이 모인 기술혁신의 최고 기업’을 지향하는 프로옵틱스(대표·홍미혜/www.prooptics.co.kr)는 광학설계 및 광학계 조립기술에 있어 타의 추종을 불허한다. 지난해 연말에는 이천시 신사옥으로 입주하면서 새로운 도약의 발판을 마련한 이 회사는 최근 반도체 검사용 광학계 개발에 주력하고 있는 가운데 향후 세계최고의 반도체 스테퍼용 노광장치 및 인공위성 광학계의 제작에도 도전장을 내밀어 선진국과 당당히 어깨를 나란히 하는 기술우위 광학업체로 거듭나겠다는 각오를 내비친다.

• Journal of the Korean Society for Nondestructive Testing
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• v.14 no.3
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• pp.157-171
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• 1994

A scanning tunneling microscope has been built, which can resolve atomic arrangements of conductors and semiconductors in ultra high vacuum below $10^{-11}$ Torr. Its background and operational principles are reviewed and the guide lines in building the scanning tunneling microscope are shown. The results of measurements for highly oriented pyrolytic graphite and Si(111) surface are presented.

• Journal of Soil and Groundwater Environment
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• v.9 no.4
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• pp.62-73
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• 2004

The current status and problems of UST management in gas stations were reviewed, and suggestions were made for possible improvement of UST management. Regulations and programs relevant through the whole life cycle of the UST, such as construction, installation, operation, and disclosure are insufficient to prevent oil release. The UST requirements are less stringent compared to those of the U.S. and EU members. Current soil test does not seem to be practically effective in detecting soil contamination caused by oil release. The potential for subsurface contamination due to oil release from the UST is estimated from available data other than soil test results. Much higher following future directions and suggestions are made to improve current unsatisfactory UST management: Firstly, increasing the UST requirements - establishing more stringent standards for new UST facilities, and adding new regulatory requirements for existing UST facilities; secondly, replacing current soil test with the tank and piping tests; thirdly, reinforcing programs for supervising the tank construction and installation; fourthly, constructing a system in which independent gas stations can properly manage the USTs; and lastly, educating UST owners and operators, and constructing DB of UST facilities.

• Journal of the Korean Society for Nondestructive Testing
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• v.5 no.2
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• pp.42-48
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• 1986

Electromagnetic - Acoustic Transducers for the inspection of tubes were developed using permanent magnets and induction coils. The propagation velocity of ultrasonic waves in a tude wall was measured by the transducers. The position of a flaw in a tube and the relative size of flaws with different size were measured.

• Journal of the Korean Society for Nondestructive Testing
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• v.24 no.2
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• pp.136-141
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• 2004

A torsional guided wave mode was applied to detect a crack in a pipe. An array of electromagnetic acoustic transduce. (EMAT that can generate and receive torsional guided ultrasound with the frequency of 200kHz was designed and fabricated for testing a pipe of 2.5 inch diameter Artificial notches with various depths were fabricated in a bent feeder pipe mock-up and the detectability was examined from the distance of 2m of the specimen. The axial notches with the depth of 5% of wall thickness were successfully detected by a torsional mode (T(0,1)) generated by the EMAT However, it was found that the depth of defects was not related to the signal amplitude.

• Journal of the Korean Society for Precision Engineering
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• v.22 no.3 s.168
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• pp.7-14
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• 2005

본 논고에서는 microfocus X 선 발생장치와 평판형 영상센서를 이용한 micro-CT 시스템의 개발과 그 응용에 대해 소개하였다. 개발과 관련하여서는 영상센서 및 시스템의 동작원리뿐만 아니라 성능평가 결과에 대해서도 간단히 언급하였는데, 이와 같은 성능평가는 추후 개선된 혹은 새로운 설계 및 제작을 위해서는 필수적으로 수반되어야 할 부분이다. 개발된 micro-CT 시스템의 응용분야 소개와 관련하여서는 몇 가지 획득 영상을 토대로 바이오 영상과 산업용 영상에 관하여 언급하였다. 바이오 영상분야에서는 현재 세계적으로 유수 의료기기업체에서 이미 제작하여 판매하고 있으며, 대부분 X선 영상증배관 혹은 CCD(charge-coupled device)를 X 선 영상획득 센서로 사용한 반면, 본 논고에서 소개한 시스템은 평판형 영상센서를 사용했다는 점에서 차별성이 있다. Micro-CT 시스템의 산업용 영상분야로의 적용은 이제 시작 단계이며, 기존 라미노그라피 시스템을 대체하거나 혹은 새로운 응용으로 자리매김할 것으로 기대된다.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.5 no.1
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• pp.54-69
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• 1994

The purpose of present study was to develop the Korean Version of Luria-Nebraska Neuropsychological Battery for Children(LNNB-C), to examine the reliability of it, and to establish the norms for determining the probability of brain damage. The normative group used to standardize the Korean version of LNNB-C was composed of 147 children between the age of 8 and 12(body 74, girl 73). The clinical group consisted of 19 brain damaged, 16 ADHD, and 16 psychiatric controls. The inter-scorer reliability was 96.3%, indicating that the stability of the scoring system for the Korean version of LNNB-C is good. The reliability coefficients(Cronbach's ${\alpha}$) of LNNB-C scales were ranged .51 to .91, which are similar to those of original LNNB-C. To establish the norms for detecting brain damage, the means and standard deviations for normative group were used to calculate T-scores for each scale. To determine a critical level that could successfully predict a normal child's average score at a given age, first the average score of normative group was calculated, and this score was then entered a regression equation with age to predict the average(baseline) acore. Finally, some issues on constructing the Korean version of LNNB-C and the cultural differences between Korean and American children in performing LNNB-C were discussed.

• Journal of the Korean Society for Nondestructive Testing
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• v.18 no.3
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• pp.181-190
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• 1998

A computerized tomography system was developed using the X-ray source that has diameter of 5 micrometer. The system is used for the nondestructive testing of specimens with diameter below 20 mm. The convolution back projection algorithm was adopted for the reconstruction of cross sectional image, and the shape of the X-ray beam was let parallel beam or fan beam to compare each resultant image. Our CT system was constructed to operate based on the personal computer. The sectional images of the fabricated specimens were reconstructed and analyzed. The reconstructed images well coincided with real images taken with optical microscope and gave us enough reports on the defects in the ceramic specimen. The resolution of the system regarded as about $20{\sim}30$ micrometers.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.538-539
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• 2013

LIN(Local Interconnect Network) 통신은 CAN(Controller Area Network) 통신과 더불어 차량용 통신으로 많이 사용되고 있다. LIN 통신은 필요 성능의 수준이 높지 않은 장치 및 시스템이나 비용의 경제적인 측면에서 CAN 통신의 하부버스로 많이 사용되며 LIN 노드에 개수도 점차 늘어나고 있다. 그렇기 때문에 LIN통신으로 시스템 제어 및 모니터링 프로그램을 GUI(Graphic User Interface)로 제작한다면 시스템 상태의 디스플레이 및 모니터링이 수월해진다. 함수와 GUI로 제작되는 LabVIEW는 다른 텍스트 언어기반 개발 프로그램에 비해 설계 시간 단축 및 사후 관리도 쉽다는 장점이 있다. 본 논문에서는 LabVIEW로 제작한 IBS 모듈 기능 검사 장비개발을 통해 LIN 통신으로 송수신되는 데이터를 확인하고 모니터링, 그리고 설계가 용이하다는 것을 소개하고자 한다.

• Korean Journal of Optics and Photonics
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• v.33 no.5
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• pp.218-229
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• 2022

We have investigated reliable inspection methods for finding the defects generated during the manufacturing process of lightweight, large-aperture satellite telescope mirrors using silicon carbide, and we have measured the basic physical properties of the mirrors. We applied the advanced ceramic material (ACM) method, a combined method using liquid-silicon penetration sintering and chemical vapor deposition for the carbon molded body, to manufacture four SiC mirrors of different sizes and shapes. We have provided the defect standards for the reflectors systematically by classifying the defects according to the size and shape of the mirrors, and have suggested effective nondestructive methods for mirror surface inspection and internal defect detection. In addition, we have analyzed the measurements of 14 physical parameters (including density, modulus of elasticity, specific heat, and heat-transfer coefficient) that are required to design the mirrors and to predict the mechanical and thermal stability of the final products. In particular, we have studied the detailed measurement methods and results for the elastic modulus, thermal expansion coefficient, and flexural strength to improve the reliability of mechanical property tests.