• 전자공학회논문지C
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• 제36C권5호
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• pp.27-37
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• 1999

비냉각 열상장비의 핵심 부품으로 사용되는 InfraRed Focal Plane Array(IRFPA)용 CMOS ReadOut IC (ROIC)를 설계하였다. 설계된 ROIC는 64×64 배열의 Barium Strontium Titanate(BST) 적외선 검출기에서 검출되는 신호를 받아 이를 적절히 증폭하고 잡음제거 필터링을 거쳐 pixel 단위로 순차적으로 출력하는 기능을 수행하며, 검출기 소자와의 임피던스 매칭, 저잡음 및 저전력 소모, 검출기 소자의 pitch 등의 사양을 만족하도록 설계되었다. 검출기 소자와 전치 증폭기 사이의 임피던스 매칭을 위해 MOS 다이오드 구조를 기본으로 하는 새로운 회로를 고안하여 적용함으로써 표준 CMOS 공정으로 구현이 가능하도록 하였다. 또한, tunable 저역통과 필터를 채용하여 신호대역 이상의 고주파 잡음이 제거되도록 하였으며, 단위 셀 내부에 클램프 회로를 삽입하여 출력신호의 신호 대 잡음비가 개선되도록 하였다. 64×64 IREPA ROIC는 0.65-㎛ 2P3M (double poly, tripple metal) N-Well CMOS 공정으로 설계되었으며, 트랜지스터, 커패시터 및 저항을 포함하여 약 62,000여개의 소자로 구성되는 코어 부분의 면적은 약 6.3-{{{{ { mm}_{ } }}}}×6.7-{{{{ { mm}_{ } }}}}이다.

• 한국잠사곤충학회지
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• 제41권1호
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• pp.41-47
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• 1999

중성염에 용해한 후 얻어진 견피브로인 수용액의 pH를 3.0으로 조정하였을 때 피브로인 분자쇄들간에 정전기적 반발력이 감소하여 피브로인 분자쇄 상호간에 결합력이 증가하므로 겔화시간이 단축되었고 적외선분광분석 결과 ${\beta}$-sheet 구조로의 전이가 빨리 일어나고 있음을 확인하였다. 2. Silk fibroin 용액내에 glycerol 함량비가 클수록 겔화의 시간은 크게 단축되었으나 상대적인 수분함량의 증가로 강도는 낮아졌다. 3. Silk fibroin 용액내에 피브로인의 농도가 높을수록 겔의 강도는 낮아졌다. 4. 효소분해된 Silk fibroin 용액을 pH3.0으로 조정 후 실온에서 보관하였을 때 분자량저하에 따른 분자쇄간 결합력 약화로 겔상을 이루지 못하고 흰색의 분말상 침전을 형성하였으나 pH 3.0 조정 후 원심분리하면 겔상을 얻을 수가 있었다. 5. 시차주사열분석결과, 견피브로인 수용액을 등전점 조절하였을 때에는 재결정화에 의한 발열피크가 나타나지 않았고 결정성이 좀더 높았으며 효소처리한 경우에는 분자량감소로 낮은 온도 부근에서 일부 열분해가 일어났으나 저분자화된 분자쇄들이 새로운 결합을 형성하여 열적안정성이 다소 높게 나타났다.

• 한국균학회지
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• 제37권1호
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• pp.91-95
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• 2009

자연에서 채집한 치마버섯 자실체로부터 분리한 Schizophyllum commune 균을 배양하여 얻은 균사체 배양물로부터 추출한 다당류의 물리화학적 특성에 대하여 조사하였다. 액체배양 균사체로부터 추출된 다당류는 방법에 따라 $0.19{\sim}1.63%$의 수율을 나타내었다. 이들 다당류의 총 당은 $48.9{\sim}72.0%$이고, 단백질은 $15.3{\sim}32.0%$를 함유하고 있는 것으로 나타났다. 추출한 SC-EP 다당류의 구성 당은 glucose가 69.6%로 주를 이루고, fructose가 26.1%, 소량의 xylose로 구성된 것으로 나타나는 것으로 보아 hetero 다당류인 것으로 추정되었다. 또한, 산성 아미노산인 aspartic acid, glycine 및 glutamic acid 등은 각각 12.5%, 18.1% 및 15.2%, 중성아미노산인 alanine은 9.9%, 당과 단백질의 O${\beta}-glycosidic$ 결합에 관여하고 있는 threonine과 serine의 경우는 2.9% 및 2.7%로 나타났다. IR 분석결과 이들은 ${\alpha}$ 와 ${\beta}$-glucan이 혼재된 다당류인 것으로 나타났다. 한외여과장치로 제조한 다당류(SC-UP)의 0.5% 용액의 점도는 20 rpm 시 70 cps로 나타났다. 이상의 치마버섯 액체배양 균사체를 열수추출하여 에탄올 침전시켜 얻은 다당류는 당과 단백질이 결합된 단백다당류의 결합 형태를 이루고, 당은 2가지 이상의 당이 혼재하고 있으며, 아미노산은 산성아미노산의 함량이 높은 것으로 나타났다. 다당류의 결합 양식은 ${\alpha}$ 와 ${\beta}$-glucan이 혼재하고 있으며, 강한 점성을 나타내었다.

• Asian Pacific Journal of Cancer Prevention
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• 제15권3호
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• pp.1299-1306
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• 2014

Background: Nano-biotechnology is recognized as offering revolutionary changes in various fields of medicine. Biologically synthesized silver nanoparticles have a wide range of applications. Materials and Methods: Silver nanoparticles (AgNPs) were biosynthesized with an aqueous extract of Pterocladiella (Pterocladia) capillacea, used as a reducing and stabilizing agent, and characterized using UV-VIS spectroscopy, Fourier Transform Infra red (FT-IR) spectroscopy, transmission electron microscopy (TEM) and energy dispersive analysis (EDX). The biosynthesized AgNPs were tested for cytotoxic activity in a human hepatocellular carcinoma ($HepG_2$) cell line cultured in Dulbecco's modified Eagle medium supplemented with 10% fetal bovine serum, 1% antibiotic and antimycotic solution and 2 mM glutamine. Bacterial susceptibility to AgNPs was assessed with Staphylococcus aureus, Bacillus subtilis [Gram+ve] and Pseudomonas aeruginosa and Escherichia coli [Gram-ve]. The agar well diffusion technique was adopted to evaluate the bactericidal activity of the biosynthesized AgNPs using Ampicillin and Gentamicin as gram+ve and gram-ve antibacterial standard drugs, respectively. Results: The biosynthesized AgNPs were $11.4{\pm}3.52$ nm in diameter. FT-IR analysis showed that carbonyl groups from the amino acid residues and proteins could assist in formation and stabilization of AgNPs. The AgNPs showed potent cytotoxic activity against the human hepatocellular carcinoma ($HepG_2$) cell line at higher concentrations. The results also showed that the biosynthesized AgNPs inhibited the entire panel of tested bacteria with a marked specificity towards Bacillus subtillus. Conclusions: Cytotoxic activity of the biosynthesized AgNPs may be due to the presence of alkaloids present in the algal extract. Our AgNPs appear more bactericidal against gram-positive bacteria (B. subtillus).

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.533-536
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• 2007

The LiDAR data structure has the potential for modeling in three dimensions because the LiDAR data can represent voxels with z value under certain defined conditions. Therefore, it is possible to classify the physical damaged degree of vegetation by forest fire as using the LiDAR data because the physical loss of canopy height and width by forest fire can be relative to an amount of points reached to the ground through the canopy of damaged forest. On the other hand, biological damage of vegetation by forest fire can be explained using the NDVI (Normalized Difference Vegetation Index) which show vegetation vitality. In this study, we graded the damaged degree of vegetation by forest fire in Yangyang-Gun of South Korea using the LiDAR data for physical grading and digital aerial photograph including Red, Green, Blue and Near Infra-Red bands for biological grading. The LiDAR data was classified into 2 classes, of which one was Serious Physical Damaged (SPD) and the other was Light Physical Damaged (LPD) area. The NDVI was also classified into 2 classes which are Serious Biological Damaged (SBD) and Light Biological Damaged (LBD) area respectively. With each 2 classes ofthe LiDAR data and NDVI, the damaged area by forest fire was graded into 4 degrees like damaged class 1,2,3 and 4 grade. As a result of this study, 1 graded area was the broadest and next was the 3 grade. With this result, we could know that the burned area by forest fire in Yangyang-Gun was damaged rather biologically because the NDVI in 1 and 3 grade appeared low value whereas the LiDAR data in 1 and 3 grade included light physical damage like the LPD.

• 대한원격탐사학회지
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• 제37권2호
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• pp.291-304
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• 2021

기후변화나 여러 환경문제들로부터 지속 가능한 산림자원 관리 및 모니터링을 위해 임상도의 지속적인 갱신은 필수적이다. 따라서 효율적이고 광역적인 산림 원격탐사의 필요성에 따라 차세대 중형위성 4호의 사업이 확정되어 2023년 발사 예정에 있다. 농림위성(차세대 중형위성 4호)는 5 m급 공간해상도와 Blue, Green, Red, Red Edge, Near Infra Red 총 5개 밴드를 가진다. 본 연구는 농림위성의 발사 및 활용에 앞서 농림위성과 유사한 사양을 가지는 RapidEye를 이용하여 위성 기반 수종분류의 가능성을 모의 평가하기 수행되었다. 본 연구는 춘천 선도산림경영단지를 연구 대상지로 하였으며, RapidEye 위성 영상기반 모의 수종분류는 생육기 영상으로부터 추출한 분광정보와 생육기와 비생육기의 NIR 밴드로부터 추출한 GLCM 질감특성 정보가 활용되었고, 이를 입력데이터로 하여 랜덤 포레스트(Random Forest) 기법을 적용하였다. 본 연구에서는 침엽수종 3종(소나무, 잣나무, 낙엽송), 활엽수종 5종(신갈나무, 굴참나무, 자작나무, 밤나무, 기타활엽수), 침활혼효림 총 9종으로 임상을 분류하였다. 분류 정확도는 임상도와 분류 결과를 대조하여 산출하였으며, 분류 정확도는 분광정보만 사용한 경우 39.41%, 분광정보과 질감정보를 모두 사용한 경우 69.29%의 정확도를 보였으며, 다중시기 분광정보 및 질감정보의 활용을 통해 5 m 해상도의 위성영상으로부터 수종분류의 가능성이 있음을 확인하였다. 향후 식생의 생태적 특성을 더욱 효과적으로 반영한 추가 변수를 대입하여 농림위성 활용 가능성을 제고하고자 한다.

• 한국산업보건학회지
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• 제19권1호
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• pp.1-7
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• 2009

To establish the Fourier-Transform Infra-Red spectrophotometry(FTIR) Direct-On-Filter(DOF) technique as a useful analytical method for quartz in respirable dust samples, an influence of the kaolinite should be corrected. Respirable dust, created in a dust chamber containing the standard material of quartz and kaolinite were collected using a cyclone equipped with a 25 mm, $0.8\;{\mu}m$ pore size DM filter as a collection medium. This study was designed to compare three methods of correction for kaolinite when quantifying the content of quartz, including the least square, the optimum choice and the spectral subtraction methods. The content of quartz in the respirable dust samples was overestimated by 6.2% when mixed with kaolinite(35.5% by weight). The content of quartz containing kaolinite(72.8% by weight) were overestimated by 32%. The spectral subtraction method underestimated the quartz content by 1.5%, while the other two correction methods, the optimum choice and the least square method, overestimated the quartz content by 1.9% to 6.4% and 0.04 to 1.1%, respectively. The results of this study are suggested that, when correcting for effects of kaolinite on quantitative analysis of quartz in respirable dust by FTIR direct-on-filter method, the least square method produce the most unbiased results be compared with those of other correction methods.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 1998년도 The 12th Asia Quality Management Symposium* Total Quality Management for Restoring Competitiveness
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• pp.361-377
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• 1998

The measurement of welding temperature of connector is usually performed with an infra red temperature gauge. However, the factors, which influence the temperature measurement, are rarely known. This research used the welding temperature measurement of the connector as an example, applying the experimental design, in two-phase experiments, to search the affecting factors. In phase-I experiment, we used a resolution III, seven-factor fractional factorial design with two levels for each factor. The result showed that none of the factor was significant in affecting the welding temperature when the type I error ${\alpha}$ was 0.05. Next, we did the phase-II factorial experiment with three factors and each factor had three levels. The experiment showed the experimental time was significant in affecting the temperature measurement when the type I error ${\alpha}$ was 0.05. Further Duncan's multiple range tests on the second experimental data showed that the later the experimental time, the weaker the light intensity could have on the temperature measurement and the average of the highest temperatures was lower. Moreover, the later the experimental time, the smaller was the variance of the temperature measurement and the difference between the averages of the highest and the lowest temperatures was also lower.

• 대한조선학회논문집
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• 제49권3호
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• pp.264-272
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• 2012

A study on the IR(InfraRed) signature of a naval ship has been performed using well known IR signature analysis software, ShipIR/NTCS. Variations of the IR signature radiated from skins of a naval ship have been investigated according to the monthly averaged marine climate conditions. An unclassified destroyer model with and without applying the washdown system was applied to compare the influence on the signature under the background changes. The marine background models were created from the observed data by a buoy of Korea Meterological Administration(KMA). The sensitivity of the ship signature against the climate variables such as air temperature, sea temperature, relative humidity has been studied as well. The seasons which show extreme(max, min) skin signature change by whether the washdown is applied or not. The sensitivities of the air temperature and the sea temperature for a dry-ship reversed by applying the washdown on the ship surfaces.

• 한국멀티미디어학회논문지
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• 제17권8호
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• pp.923-936
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• 2014

Images can be contaminated with different types of noise, for different reasons. The neighborhood averaging and smoothing by image averaging are the classical image processing techniques for noise removal. The classical spatial filtering refers to the aggregate of pixels composing an image and operating directly on these pixels. To reduce or remove effectively noise in image sequences, it usually needs to use noise reduction filter based on space or time domain such as method of spatial or temporal filter. However, the method of spatial filter can generally cause that signals of objects as the target are also blurred. In this paper, we propose temporal filter using the piece-wise quadratic function model and enhancement algorithm of image quality for the performance improvement of target detection and tracking by heterogeneous noise reduction. Image tracking simulation that utilizes real IIR(Imaging Infra-Red) images is employed to evaluate the performance of the proposed image processing algorithm.