• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1487-1490
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• 2005

This study proposes a controller with the techniqu e of voltage -compensated driver for producing grayscaled pictures on passive matrix organic light emitting diodes (PMOLEDs) panels; especially, the controller overcomes the problem of luminance nonuniformity on displaying pictures. Because the controller is a voltage type driver, the output impedance of the driver is much less than that of the current-type driver. Hence, the controller provides a better electron-optical response than those of traditional current drivers. An area compensated look-up table (ACLUT) is designed in data feeding paths for removing luminance non-uniformity; thus, the proposed controller provides nearly 95% luminance uniformity.

• 천문학회보
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• 제43권1호
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• pp.73.2-73.2
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• 2018

The Hayabusa remote-sensing images of near-Earth asteroid (25143) Itokawa exhibited large diversity in spectral properties. The evidence suggests a various degrees of space weathering on the surface. It is known that the space weathering changes the spectra of S-type asteroids redder and reduces the depths of absorption around $1{\mu}m$. It is therefore possible to determine the surface ages through the investigation of the degree of space weathering. It is, however, reported that the scattered light components severely degrade the Asteroid Multiband Imaging Camera (AMICA) images, especially at the wavelengths > $0.86{\mu}m$. Our team came up with a technique for subtracting the scattered light components (Ishiguro 2014). Here, we upgraded the techniqu e by applying simplex algorism to correct the artifacts for all AMICA bands. This new technique enables to apply for the longest channel (i.e., zs-band at $1.01{\mu}m$) images, which was not studied so far. With the AMICA all bands data, we estimated the surface ages at the different location to be 0.6-2 Myr. Based on this data together with the geological information (e.g. gravitational potentials and local). we will discuss about the evolution of surface materials on the asteroid.

• Korean Journal of Radiology
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• 제20권8호
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• pp.1285-1292
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• 2019

Objective: To evaluate the safety and efficacy of the coil-protected technique for liquid embolization in neurovascular malformations. Materials and Methods: Twenty-two patients who underwent coil-protected liquid embolization for symptomatic cranial (n = 13) and spinal (n = 9) arteriovenous fistula (AVF) or arteriovenous malformations (AVMs) were identified. A total of 36 target feeder vessels were embolized with N-butyl cyanoacrylate and/or Onyx (Medtronic). This technique was used to promote delivery of a sufficient amount of liquid embolic agent into the target shunt or nidus in cases where tortuous feeding arteries preclude a microcatheter wedging techniqu and/or to prevent reflux of the liquid embolic agent in cases with a short safety margin. The procedure was considered technically successful if the target lesion was sufficiently filled with liquid embolic agent without unintentional reflux. Angiographic and clinical outcomes were retrospectively evaluated. Results: Technical success was achieved for all 36 target feeders. Post-embolization angiographies revealed complete occlusion in 16 patients and near-complete and partial occlusion in three patients each. There were no treatment-related complications. Of the six patients who showed near-complete or partial occlusion, five received additional treatments: two received stereotactic radiosurgery for cerebral AVM, two underwent surgical removal of cerebral AVM, and one underwent additional embolization by direct puncture for a mandibular AVM. Finally, all patients showed complete (n = 19) or near-complete (n = 3) occlusion of the target AVF or AVM on follow-up angiographies. The presenting neurological symptoms improved completely in 15 patients (68.2%) and partially in seven patients (31.8%). Conclusion: The coil-protected technique is a safe and effective method for liquid embolization, especially in patients with various neurovascular shunts or malformations who could not be successfully treated with conventional techniques.

• 대한디지털의료영상학회논문지
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• 제10권1호
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• pp.45-50
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• 2008

Recently, MR Cholangiography used mainly bu controlling of patient's breathing. There is breathing hold techniques to get images within shopt time and gating technique adjusted to respiration cycle for high resolution image. In this study, the aim of this experiment is to know on clinical usefulness compared with PACE and RTG thchniques. This study's period is from 2006 in November to 2007 in January. A total of 21 patients investigated at MAGNETOM Sonata 1.5T (SIEMENS Erlangen) with use of 12ch body coil. MR acquisition protocol used 3D turbo spin echo coronal sequence. Scan parameters applied to potimal setting in use as gating techniques, respectively. Analysis of consuming timing evaluated with rapidness. As analysis of quantity, the common bile duct, gall bladder measured in signal intensities, then these data were calculated by signal to noise ratio and contrast to noise ratio. Qualitative analysis, experienced 2radiologists and 3 RTs were evaluated into 3groups about artifact, accuracy of lesions, sharpness of the common bile duct or gall bladder. As a result of analysis, when compared to PACE, consuming time of the RTG took less than PACE, On both CNRs and SNRs, PACE technique was slightly high values than RTG(p<0.05). Qualitative analysis' results, discrimination of lesions in the common bile duct, gall bladder get a significance level in both RTG and PACE techniques but presence's artifact of breathing and pulsation highly demonstrate in PACE techniques. In conclusion, both PACE and RTG methods at MRCP provided prominently clinical information for the common bile duct, gall bladder. If machines have not limitation with performance, induction of breathing holding also will help getting diagnistic quality.

• 디지털융복합연구
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• 제19권10호
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• pp.221-227
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• 2021

본 논문에서는 버티컬 무소음 마우스 10,000건에 대한 웹크롤링을 통해 수집된 정형화된 데이터셋을 Word2Vec을 이용하여 단어 간 유사도분석을 시행하고 컴퓨터공학과 대학생 92명에게 5일 동안 제시된 상품을 사용하게 하고 자가보고식 설문 분석을 시행하도록 하였다. 설문 분석은 서술식 형태로 수집하여 단어빈도 분석과 단어 간 유사도분석에서 추출된 상위 50개 단어를 제시하고 선택하는 방식으로 이루어졌다. 전자상거래 사용자 상품평 유사도 분석결과 내용 중 클릭 키워드에 대한 장점으로 통증(.985), 디자인(.963)가 분석되었으며 단점은 가볍다(.952), 적응(.948)이었다. 서술식 빈도분석에서는 버티컬(123개), 통증(118개)이 가장 많이 선택 되었으며 장/단점 유사단어를 선택에 해당되는 장점에서는 버티컬(83개), 통증(75개) 선택 되었으며 단점에서는 적응(89개), 버튼(72개)이었다. 따라서 본 연구에서 적용한 방식을 상품기획 프로세스의 신상품 개발 및 기존 상품의 검토 전략으로 반영 시 중견기업, 중소기업의 의사결정자와 상품기획자는 의사결정에 중대한 자료로 활용 할 수 있을 것으로 기대된다.

• 한국토양비료학회지
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• 제15권3호
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• pp.178-187
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• 1982

초지개발이 유망시되는 전국각지의 미개간(未開墾) 산지토양(山地土壤)의 표토(表土)를 채취(採取)하여 다량(多量) 요소(要素)의 음(陰)이온총량(総量) : 양(陽)이온총량(総量)(${\Sigma}$ Anion: ${\Sigma}$ Cation) 적정시비비율(適正施肥比率)과 적정총시비량(適正総施肥量)(${\Sigma}$ion)결정(決定)을 위한 Pot시험(試驗)을 수원(水原)에서 수행(遂行)한 결과(結果)는, 1. 제주등 5개지역(個地域)의 토양(土壤)에 대한 혼파목초재배시(混播牧草栽培市) 각토양(各土壤) 및 초종별(草種別) 다수획(多收獲)을 얻기 위한 당량비기준의 음(陰)과 양(陽)이온 총량간(総量間)의 적정(適正) 시비비율(施肥比率)과 적정총시비량(適正総施肥量)이 계산(計算)되었다(표(表)6,7) 2. 혼파재배(混播栽培)에서 화본과목초(禾本科牧草)는 음(陰)이온총량(総量), 두과목초(荳科牧草)는 양(陽)이온총량(総量) 비율(比率)이 높을수록 이들의 수량(收量)과 식생구성비율(植生構成比率)이 증가(增加)하였다. 적정(適正) 음(陰)과 양(陽)이온총량(総量) 비율(比率)은 화본과목초(禾本科牧草)에서는 음(陰)이온총량(総量)이 두과목초(荳科牧草)에서는 양(陽)이온총량비율(総量比率)이 각각(各各) 타(他)이온총량비율(総量比率)보다 훨씬 높을 때였다. 3. 두과목초(荳科牧草)의 수량제고(收量提高)를 위(爲)한 적정총시비량(適正総施肥量)은 음(陰)과 양(陽)이온총량비율(総量比率)에 따라 달렀다. 양(陽)이온총량비율(総量比率)이 높아질수록 적정총(適正総)이온농도(濃度)(총시비량(総施肥量))는 증가(增加)하였고 이의 역(逆)도 성립(成立)하였다. 4. 화본과목초(禾本科牧草) 및 총수량(総收量)(화본과(禾本科)+두과(荳科))에 미치는 음(陰)과 양(陽)이온총량(総量)의 각(各) 효율(效率)은 이들의 비율(比率)이 낮을때 그리고 총(総)이온농도(濃度)가 낮을때 제일(第一) 높았다. 5. 두과목초수량(荳科牧草收量)에 미치는 음(陰)이온총량효율은 대구토양(大邱土壤)을 제외(除外)하고는 화본과목초(禾本科牧草)와 같은 경향(傾向)이였고, 양(陽)이온총량효율은 총(総)이온농도(濃度)와 토양종류(土壤種類)에 따라 달랐으나 보편적(普遍的)으로 양(陽)이온총량비율(総量比率)이 높아질수록 본효율도 높아졌다. 6. 각(各) 구성초종(構成草種)의 수량(收量), 식생비율(植生比率)은 음(陰)과 양(陽)이온총량비율(総量比率), 총(総)이온농도(濃度)와 이들의 상호작용(相互作用)에 크게 영향(影響)을 받았고, 화본과(禾本科)와 두과목초(荳科牧草)는 서로 상반적영향(相反的影響)을 받았다.