• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.11a
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• pp.413-414
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• 2007

• The Korean Journal of Pesticide Science
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• v.14 no.4
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• pp.446-455
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• 2010

The characteristics of parasporal inclusion body from Bacillus thuringiensis subsp. kurstaki KB099 isolate which is high bioactive to the tobacco cutworm, Spodoptera litura, were examined. Parasporal inclusion of B. thuringiensis subsp. kurstaki KB099 isolate showed only 1 band at 130 kDa compared with B. thuringiensis subsp. kurstaki HD-l isolate producing 2 protein bands at 130 kDa and 60 kDa from by SDS-PAGE analysis without any enzyme treatment. Also, we confirmed that gut extract of sensitive S. litura KB099 isolate had digested only 60 kDa ${\delta}$-endotoxin protein. When the digestive enzyme of sensitive insect responsible for parasporal inclusion from KB099 and HD-l isolate was treated to each of them, protein band 60 KDa of KB099 was maintained up to 12 hours but all bands of HD-l were disappeared within 6 hours. In KB099 isolate, 6 genes (Cry1Aa, Cry1Ab, Cry1Ac, Cry1C, Cry1D and Cry1I) were identified by PCR analysis. Also, $Cry^-$ mutant of KB099 isolate was investigated by phase- contrast microscope, SDS-PAGE and PCR.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.11 no.1
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• pp.55-60
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• 1993

Forest occupied a part of natural ecosystem carries out a role of purifying air, preserving water resource, prevention of the breeding and extermination, recreation areas and etc that preserve and for me one's living environment. In this study, the classification for management of this forest is performed with Landsat TM Image. The classes are decided needle-leaf trees, broad-leaf trees, farming land and grass land, and water. When the TM digital images are classified on computer, water is represented in 7∼13 D.N. of 4th band. But the others is appeared similar mostly specific values so that must be done image processing. When the images compounded 2ed band and 3ed band are processed with ratio of enhancement. Needle-leaf treas is represented in l18∼136 D.N. of 1st band, broad-leaf trees in 72∼91 D.N. of 3ed band, farm land and glass land in 96∼120 of 3ed band. Forest Information is classified with M.L.C, an image classification method. The errors of needle-leaf trees, broad-leaf trees, farm land and grass land, and water are appeared each －7.43, ＋1.89,＋7.58 and －2.04 as compared the digital image with investigation on the scene. Finally, these results are useful for classification of forest vegetation with Landsat TM Image.

• Journal of the Korean Society of Radiology
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• v.15 no.4
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• pp.445-453
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• 2021

CT scan is reported to have a high risk of cancer due to a relatively high dose among medical radiological examinations. In particular, exposure to radiation to the breast, which is sensitive to radiation, is inevitable during a chest CT scan for female patient. In this study, the dose reduction effect of wearing a compression band during chest CT scans in women was evaluated, and the lifetime attributable risk due to the effective dose exposed during the CT scan was estimated. As a result, when the compression band was used, the effective tube current decreased as the outer perimeter of the chest became smaller, and it was analyzed that the CT dose index and effective dose were also reduced. In addition, the lifetime attributable risk by chest CT scan was found to reduce the cancer risk by 3.2 per 100,000 for all cancers, 0.2 per 100,000 for solid cancer, and 0.8 per 100,000 for breast cancer, based on women in their 30s when using a compression band. It is judged that the risk of cancer can be reduced through the use of appropriate scan parameters and dose optimization measures such as compression bands for future CT examinations.

• Korean Journal of Remote Sensing
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• v.39 no.6_1
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• pp.1299-1308
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• 2023

Forest fires are becoming more frequent and larger around the world due to climate change. Remote sensing such as satellite images can be used as an alternative or assistance data because it reduces various difficulties of field survey. Forest burn severity (differenced normalized burn ratio, dNBR) is calculated through the difference in normalized burn ratio (NBR) before and after a forest fire. The images used in the NBR formula are based on Landsat's near-infrared (NIR) and short-wavelength infrared (SWIR) bands. South Korea's satellite images don't have a SWIR band. So domestic studies related to forest burn severity calculated dNBR using overseas images or indirectly using the normalized difference vegetation index (NDVI) using South Korea's satellite images. Therefore, in this study, dNBR was calculated by substituting the mid-wavelength infrared (MWIR) band of Kompsat-3A (K3A) instead of the SWIR band in the NBR formula. The results were compared with the dNBR results obtained through Landsat which is the standard for dNBR formula. As a result, it was shown that dNBR using K3A's MWIR band has a wider range of values and can be expressed in more detail than dNBR using Landsat's SWIR band. Therefore, it is considered that K3A images will be highly useful in surveying burn areas and severity affected by forest fires. In addition, this study used the K3A's MWIR band images degraded to 30 m. It is considered that much better results will be obtained if a higher-resolution MWIR band is used.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.227-227
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• 2012

본 연구에서는 RF스퍼터링법에 의하여 glass substrate에 In-Zn-Sn-O (IZTO)를 Zn 성분에 변화를 주면서 $350{\AA}$ 만큼 증착시키고, 1시간 동안 $350^{\circ}C$로 열처리 하였다. In:Zn:Sn의 성분 비율은 20:48:32 (IZTO1), 13:60:27 (IZTO2)이다. 박막의 전자적, 광학적 특성은 XPS (X-ray Photoelectron Spectroscopy), REELS(Reflection Electron Energy Loss Spectroscopy), UV-Spectrometer를 이용하여 연구하였고, 박막의 전기적 특성은 van der Pauw 법을 이용하여 측정하였다. XPS측정결과, IZTO박막은 In-O, Sn-O and Zn-O의 결합을 가진다. REELS를 이용해 Ep=1,500 eV에서의 밴드갭을 얻어보면, $350^{\circ}C$로 열처리 한 박막은 열처리를 하지 않은 것에 비해 밴드갭이 IZTO1는 3.36 eV에서 3.54 eV로, IZTO2는 3.15 eV에서 3.31 eV로 증가하였다. 반면에 Zn 함량이 증가할수록 밴드갭이 감소하는 것을 확인할 수 있었다. 이 값은 UV-Spectrometer를 이용한 광학적 밴드갭과 일치하였다. 또한 van der Pauw method를 이용한 전기적 특성 분석 결과, 열처리를 하기 전에 비하여 carrier concentration이 IZTO1는 $-4.4822{\times}10^{18}cm^{-3}$에서 $-2.714{\times}10^{19}cm^{-3}$로, IZTO2는 $-3.6931{\times}10^{17}cm^{-3}$에서 $-1.7679{\times}10^{19}cm^{-3}$로 증가하였다. 반면에 Resistivity는 IZTO1의 경우 $1.7122{\times}10^{-1}{\Omega}{\cdot}cm$에서 $5.5496{\times}10^{-3}{\Omega}{\cdot}cm$로, IZTO2는 $1.3290 {\Omega}{\cdot}cm$에서 $1.3395{\times}10^{-2}{\Omega}{\cdot}cm$로 감소하였다. 그리고 UV-Spectrometer를 이용한 광학적 특성을 측정해본 결과, 가시광선영역인 380~780 nm에서의 투과율이 83%이상으로 투명전자소자로의 응용이 가능하다는 것을 보여주었다.

• Journal of Life Science
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• v.13 no.5
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• pp.651-657
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• 2003

Randomly amplified polymorphic DNA (RAPD) analysis was used to study genetic relationships among C. polykrikoides, G. impudicum and G. catenatum, which possess similar morphological features. Four of 12 primers were selected and 59 amplification products ranged from 0.2 kb to 3.0 kb. The number of polymorphic products in C. polykrikoides, G. impudicum and G. catenatum was 16 (27.1%), 8 (13.5%), and 16 (27.1%), respectively, while 17 were monomorphic. Number of species-specific bounds was 26 (44.0%), 34 (57.6%), 26 (44.0%) in C. polykrikoides, G. impudicum and G. catenatum, respectively. The genetic similarity between C. polykrikoides and G. impudicum/G. catenatum was 0.83, whereas G. impudicum and G. catenatum was 0.78. Our results suggest that C. polykrikoides, G. impudicum and G. catenatum are extremely different on the basis of RAPD analysis, despite similarity based on their morphology. The RAPD technique appears to be efficient in detecting genetic variation in these dinoflagellates.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.334.2-334.2
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• 2014

본 연구에서는 a-InGaZnO (IGZO) 활성층에 대기분위기에서 열처리 온도를 각각 $150^{\circ}C$, $250^{\circ}C$, $350^{\circ}C$ 실시하여 전자구조와 광학적 특성분석 및 화학적 결합 상태의 변화를 알아보고, 이러한 물성 변화에 따른 소자의 특성을 알아 보았다. 박막 트랜지스터 소자의 전기적 특성은, IGZO 박막에 후 열처리 공정온도 후 제작한 박막 트랜지스터는 $150^{\circ}C$에서 3.1 cm2/Vs의 전계 효과 이동도와 0.38 V/decade의 문턱전압 이하 기울기를 보였으나, $350^{\circ}C$에서는 8.8 cm2/Vs의 전계 효과 이동도와 0.20 V/decade의 문턱전압 이하 기울기로 더 향상된 박막 트랜지스터의 전기적 특성 결과를 관측하였다. 전기적 소자 특성의 변화와 활성층 IGZO 박막 특성 변화와의 상관관계를 조사하기 위하여 X-ray Absorption Spectroscopy (XAS)과 Spectroscopy Ellipsometry (SE)로 측정된 흡수 스펙트럼을 통하여 3 eV 이상의 광학적 밴드 갭은 기존에 보고 되었던 a-IGZO와 유사한 특성을 보이고 있음을 확인하였고, 이러한 측정, 분석법들을 통해 후 열처리 공정 온도에 따른 밴드 갭 부근의 결함준위의 양 변화와 가전자대의 전자구조의 변화에 따라 전기적 특성이 달라짐을 확인 할 수 있었다. 또한, X-ray Photoemission Spectroscopy (XPS)를 통해 측정한 O-1s를 통해 Oxygen deficient state와 밴드 갭 부근의 결함준위와의 상관관계를 도출해낼 수 있었다. 이는 a-IGZO 활성층에 후 열처리 공정 온도 변화에 따라서 전자구조의 혼성변화와 밴드 갭 부근의 결함준위의 양의 변화, 에너지 준위의 변화 및 이와 연관된 화학적 상태 변화가 박막 트랜지스터의 특성 변화를 예상할 수 있다는 결과를 도출하였다.

• Korean Journal of Microbiology
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• v.35 no.3
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• pp.173-179
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• 1999

As a result of PCR-RFLP, the isolates used in this study were classified into five groups. Isolates 1 and 3 were included in AG-5 with 97% genetic similarity. Isolates 12 and 13 were included in AG-1 wilh 100% genetic similarily. Isolates 10 and AG-2-2 showed 97% similarity Isolates 7, 8, 11. 13, and 15 were included in AG-1. When isolates of 4, 5, 7 and 8 were restricted with Hae I. there was a single 700 bp fragment matched with AG-1. A 517 bp restriction fragment of isolate 9 was matched with AG-2-1. Based on the result of southem hybridization of genomic DNAs, all isolates restricted with Msp I showed more variable restriction differences than those restricted with Hae Ill. Isolates AG-2-1 and 9 showed 200 bp restriction fragment, and isolates 3 and AG-1 showed 1 kb restriction fragments.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.10C
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• pp.992-1000
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• 2009

Available electric wave resources have been limited than frequency demands that increase with the development of radio communication. According to FCC's (Federal Communication Commission) report, 70% of allocated spectrum was unused. This means that the lack phenomenon of electronic wave resources is ineffectively managed compare with the finiteness of frequency resources. According to the recognition of unused frequency within allocated band, this progress has been investigating to identify the unused TV channel and provide radio communication services. This paper proposed the sensing algorithm that efficiently recognizes the frequency resources which does not use and shares with the licensed user through using the multi-band CIC (Cascaded Integrator Comb) filter based on polyphase filter bank. The simulation results verifies that the proposed scheme can obtain the similar performance of variance and relatively low complexity to the existing scheme.