• Korean Chemical Engineering Research
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• v.49 no.4
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• pp.387-392
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• 2011

Enzymes are being used in various fields due to their unique property of substrate specificity. Enzyme-linked immunosorbent assay(ELISA) has enabled the detection of various antigens by reporting the binding event of antigen and antibody via enzyme-catalyzed reaction. However, the sensitivity improvement of conventional ELISA has been limited because only one enzyme molecule is conjugated to one molecule of antibody. To overcome this limitation and further improve the sensitivity of ELISA, there have been efforts to increase the number ratio of enzymes to antibody. Recently, the nanobiocatalytic approaches, with their successful enzyme stabilization, improved the performance stability as well as sensitivity in a modified protocol of ELISA. The present paper introduces the basic principle of ELISA, and the recent efforts to improve sensitivity and performance stability of ELISA by using the nanobiocatalytic approaches.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.39 no.6
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• pp.525-531
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• 2021

The importance and utilization of underground spatial is increasing due to urban concentration. And so underground spatial information is being built. Because underground spatial information is an important NSDI (National Spatial Data Infrastructure), the accuracy and performance of underground spatial exploration devices used for construction are managed separately. In accordance with the laws and regulations related to spatial information, the government is conducting performance tests for underground facilities surveying equipment. The current performance test site mainly targets metal pipelines, and there is no absolute position surveying inspection system. In this study, test bed model for performance inspection of underground space exploration equipment was presented. The test bed presented in this study can be used as a test site to supplement the limitations of the existing domestic test bed and to verify the performance of the latest equipment.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.05a
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• pp.463-465
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• 2021

Currently, the inspection method printed on food packages and boxes is to sample only a few products and inspect them with human eyes. Such a sampling inspection has the limitation that only a small number of products can be inspected. Therefore, accurate inspection using a camera is required. This paper proposes a deep learning object recognition technology model, which is an artificial intelligence technology, as a method for detecting the defects of expiration date printed on the product packaging. Using the Faster R-CNN (region convolution neural network) model, the color images, converted gray images, and converted binary images of the printed expiration date are trained and then tested, and each detection rates are compared. The detection performance of expiration date printed on the package by the proposed method showed the same detection performance as that of conventional vision-based inspection system.

• 전기의세계
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• v.28 no.2
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• pp.14-22
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• 1979

전력계통의 증대에 따라 변전소용 변압기도 대용량화되어 가고 있다. 변전소용 대용량 변압기의 경우 최대문제가 되는 것은 철도운송의 경우 운송한계에 있다. 일본의 철도는 협궤이기 때문에 운송능력이 작고 275KV 변압기의 경우 조립운송할 수 있는 한계용량은 종래 300MVA라고 되어 왔지만, 최근 기술의 진보와 신뢰성 향상 시책에 따라 450MVA까지도 철도운송을 하는 것이 가능케 되었다. 이와같은 사정때문에 당사는 이번에 중부 전력.북풍전변전소에 3상 60Hz, 275/15 4/31.5KV, 450/450/135MVA 변압기를 납품하였다. 본기는 초고압 변전소용으로는 일본에서 최대급의 것으로 여러가지의 특징을 가지고 있다. 그 주요점을 들면, (1) 철도에 의한 조립운송을 가능케 했다. 더우기 부하시 TAP 절환기를 본체 TANK에 조립해서 운통한다. (2) 일차 초고압 권선에는 선로단을 중앙에 배치한 HISERCAP 권선을 채용한다. (3) 당초 65Phon, 장래 55Phon의 저소음사양을 만족시키기 위해서 고효율의 송유풍냉식 저소음방열관을 사용했다. (4) 기기의 신뢰성을 높이기 위해 설계, 제조, 시험 검사 각면에 만전을 기했다. 그러나 그외에도 여러가지 연구가 추진되고 있으며 다음에 개요를 설명하고져 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.10A
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• pp.1782-1793
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• 2001

터보부호 심벌비트들을 서로 다른 부호율로 반복부호화한 뒤 여러 부채널로 나란히 보내는 터보 부호화 여러반송파 직접수열 부호분할 다중접속 시스템을 제안한다. 레일리 감쇄채널에서 신호대잡음비가 높을 때에는 이 시스템의 성능 한계를 얻었고, 신호대잡음비가 낮아 한계를 적용할 수 없을 때에는 모의실험에서 성능을 살펴보았다. 신호대잡음비가 낮을 때 성능 손실이 조금 있지만 홀짝 검사(parity check) 심벌에 다양성 차수를 크게 주어 오류 마루를 (error floor) 낮출 수 있음을 보였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11a
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• pp.695-698
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• 2002

최근 시각 관련 측정기 개발에 대한 관심이 높아지고 있다. 이에 본 연구는 자동 시각 굴절력 곡률계의 전자 부문에 연동될 굴절력 측정 알고리즘을 개발하였다. 만약 자동화된 시스템이 광학계로부터 나오는 영상을 이용하여 내부 처리를 거친 후 정확한 시각 측정치를 검사자에게 알려줄 수 있다면 잘못 측정되는 측정 횟수를 크게 줄일 수 있을 것이다. 본 연구는 형태학적 필터링(morphological filtering)과 그레이-레벨의 신호 강조(signal enhance) 기술들을 이용하여 자동 시각 굴절력 측정 시스템에 연동될 측정 알고리즘을 개발하였다. 알고리즘에서는 광학계로부터, 도출된 영상으로부터 첫째로 형태학적 필터링 처리를 행하여 처리가 어려운 원 영상을 좀 더 다루기 쉬운 상태로 바꿔준 후 영상에 가해주는 그레이 수준 한계 기법을 통해 신호를 강조함으로써 영상의 그레이 값 분포가 다양함으로 인해서 발생되는 오차를 줄이게 된다. 그리하여 본 전자 부문 소프트웨어는 정확한 측정값 도출이 어려운 시각 영상에 적용되어 효과적으로 오차를 줄임으로써 보다 효율적인 시각 측정을 가능하게 하였다.

• Journal of the Korean Society of Radiology
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• v.14 no.5
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• pp.577-584
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• 2020

In this study, the number of non-English speaking visitors is increasing day by day, and accordingly, there was a limitation in language communication and communication during radiographic examination. To this end, after distributing the handbook produced for inspection, the improvement effect of before and after explanation was examined. The score scale was not statistically significant as to whether it was the test site or not, and the degree of discomfort of the test, the degree of understanding of the breathing guidelines, and the satisfaction of the test description were improved and the score scale was improved before and after the description of the guide. Non-English-speaking foreign visitors were more satisfied with explanations in their own text than in English or Korean, and the method was also able to conduct effective inspections by informing the foreign guests when to control their breathing by using the lighting signals in the laboratory. In the future, the quality of medical services and imaging medical examinations can be improved only when communication methods are implemented from various perspectives, such as developing various language interpretation programs, developing guides for various test sites, and developing tools and improving foreign language skills of radiologists and medical staff. There will be. In the future, it may be used as a basic resource to prepare a manual that can be used to examine non-English speaking foreigners who do not understand English or Korean in other radiology labs.

• Korean Journal of Clinical Laboratory Science
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• v.51 no.3
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• pp.386-395
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• 2019

The aim of this study was to introduce clinical laboratory science techniques with the core technology of the 4th Industrial Revolution. Among the core technologies of the 4th Industrial Revolution, AI, IOT, block-chain, robotics, and nanotechnology were analyzed and linked by themes. The scope of the job of clinical laboratory technologists (also known as medical laboratory technologists and medical technologists) is laboratory medicine testing, pathology testing, and clinical physiology testing. Through a number of previous papers, 73 linkages in the laboratory medicine area, 27 linkages in the pathology area, and 47 linkages in the clinical physiology area were examined. In the 4th industrial revolution and clinical laboratory science techniques, AI (4), IOT (3), block-chain (4), robotics (3) and nanotechnology (15) sectors were surveyed. The limitation of this study was the limitation in collecting and analyzing all the data and non-clinical areas were not analyzed. In addition, there was no validity test and no similar study. In conclusion, the core technologies of the 4th industrial revolution and clinical laboratory science techniques are closely related. Therefore, further research on the future and social benefits of clinical laboratory science techniques is needed.

• Journal of the Korean Institute of Gas
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• v.25 no.6
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• pp.53-65
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• 2021

While the hydrogen refueling station is rapidly expanded and installed, the safety inspection of the hydrogen pressure vessel in the station should be very important. Of these, according to ASME, hydrogen embrittlement tests must be performed for hydrogen vessel that store hydrogen above a certain pressure. The main test method for hydrogen embrittlement inspection is to carry out fracture tests and fatigue fracture tests in a high pressure hydrogen atmosphere, which allows the durability limit of the pressure vessel to be measured and the endurable limit to be determined in the hydrogen atmosphere. In detail, the critical crack depth can be calculated by the stress intensity factor(K), and the service life can be determined by da/dN (fatigue growth rate). API579-1/ ASME FFS-1 part 9 exemplifies the calculation method according to the mode of crack-like flaws, but for various shapes such as plates and cylinders, there are about 55 modes according to the shape and location of the crack. Due to the fairly complex formula, it is not easily accessible. In this study, we will show you how to calculate fracture mechanics numerically via Excel and VBA. In addition, this was applied to analyze the effects of the thickness and inner diameter of the pressure vessel on the service life.

• 보건세계
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• v.47 no.1 s.521
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• pp.12-15
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• 2000

HIV 감염자가 병원에 입원하며 의사가 가장 먼저 생각하는 일은 어떤 기회감염으로 이런 증상을 갖게 되었을까 하는 것이다. 생각할 수 있는 병도 많고 생각해야 할 병도 많지만 그 중에서도 가장 먼저 떠올리게 되는 것이 결핵이 아닌가 한다. 우선 빈도면에서 비교적 흔하고, 임상증상도 정상인과 같지 않은 점이 많아서 혼돈을 일으키는 경우가 많다. 림프종을 생각할 만큼 크고 빠르게 자란 목의 덩어리도 조직검사를 하면 결핵성 림프절염인 경우가 있고 복강내 림프절이 커지거나 뇌막염을 일으키기도 한다. 결핵약으로 치료를 하는 경우에도 해열되는데 기간이 많이 필요하고 치료 도중에 약화되는 경험을 하기도 하였다. 우리나라에서 발표된 보고에서도 서울대학교에서 발표한 173명의 환자들에서 가장 흔한 기회감염은 결핵이었다. 25$\%$의 환자에서 결핵이 발생하였으며, 환자 100명당 1년 동안의 결핵 발생률은 9.6이었다. 면역부전이 진행할수록 이 빈도는 증가한다고 보고한 바 있다. 따라서 HIV감염자를 관리, 치료하는 경우에는 결핵에 대한 충분한 이해가 필요한데 얼마전 New England Journal of Medicine에 HIV감염자에서의 결핵이라는 제목으로 발표된 자료가 있어 이를 정리하였다. 여러모로 도움이 되는 내용이지만 우리나라에서 사용할 수 있는 약제에 한계가 있고 BCG예방접종을 하기 때문에 피부반응 검사로 결핵발생을 예측하기도 어렵다는 점을 고려하면 모든 내용이 우리나라의 현실에 적용되는 것은 아니다.