• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.99-100
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• 2015

디지털 영상은 촬영 시의 여러 가지 환경적 요인 때문에 블러 현상이 발생할 수 있다. 블러 현상이 발생하면 영상 내 저주파 성분이 많아져서 영상의 품질은 떨어트린다. 이러한 문제점을 해결하기 위한 영상 대비 향상에 대한 여러 가지 방법이 제시되어 왔다. Edge 강화 2차원 필터는 처리 속도가 빠르고 간단한 대비 향상 방법이다. 하지만 인간 시각 시스템은 영상 내에서 지역적으로 주변 밝기에 따라 민감도가 다르다. 따라서 본 논문에서는 Edge 강화 2차원 필터와 주변 밝기에 따른 JND(Just Noticeable Difference)를 이용한 피쳐 기반의 디지털 영상 대비 향상 방법에 대하여 제안한다. 제안된 방법으로 영상 대비를 향상시키고 그 결과를 확인할 수 있었다.

• 한국음향학회지
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• 제29권8호
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• pp.504-508
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• 2010

기존의 초음파 의료용 탄성영상에서 변형률 영상을 모니터에 표시할 때 인간 시각 특성을 반영하여 단단한 부위는 어둡게 표시하고 무를수록 밝게 나타낸다. 따라서 종양이나 암이 존재하는 단단한 부위는 어둡게 나타나서 병변 내부의 콘트라스트는 저하되어 나타난다. 병변 영역은 단단하여 변형률 영상에서 어둡게 나타나므로 병변 내부를 좀 더 자세히 진단하는 방법으로, 누른 후의 신호를 누른 변형률만큼 다시 신장시켜서 얻는 전역 균일 신장 방법을 적용하여 영상의 명암을 반전시킴으로써 병변 부분의 콘트라스트를 올리는 방법을 제안하였다. 의료용 초음파 영상 진단기를 이용하여 탄성 모사 팬텀에서 초음파 데이터를 얻어서 제안한 알고리즘을 검증하여 유용성을 확인하였다. 전역 균일 신장 없이 회색조 컬러 맵을 반전해서 얻은 변형률 영상법에 비해 콘트라스트 대 잡음비가 최대 1.8배 정도 향상되었다.

• 한국어교육
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• 제29권4호
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• pp.93-112
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• 2018

The purpose of this study is to deal with vocabulary in KFL. As a result of this study, learners learned vocabulary on average 43 points through contextual inference and introduction of the class to activate background knowledge. In particular, the implicit method showed the highest learning rate of 52 points, and the thematic method had a 41 point-learning rate. In contrast, the semantic method was the lowest with a 25 point-learning rate. There was no significant difference in the improvement rate of upper vocabulary learners, but in the case of the lower learner, there was significant difference in the improvement rate. The difference was not significant in the post-test relative gain rate of upper learners, but there was significant in lower learners. In the delayed test relative gain rate, the difference was significant in all groups. There was correlation between vocabulary difficulty and score, but there was no correlation with the thematic method. And there was no correlation between vocabulary difficulty, improvement rate and relative gain rate in all three classes. However, content understanding, lexical grade, improvement rate, and relative gain rate showed a significant correlation.

• 복식문화연구
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• 제19권1호
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• pp.163-175
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• 2011

The purposes of this study are to identify quality factors of knitwears, to find out important attributes of knitwears quality, and to find attributes of knitwears quality which improvement are required. College students in the Seoul district participated in the study, a convenience sampling method was used. A questionnaires was arranged with three separates subject sections, importance degree of knitwears quality, satisfaction degree of purchased knitwears, and demographic factors. Data from 280 questionnaires were used for the statistical analysis. For data analysis, factor analysis, paired-samples t-test and multiple response frequency were conducted. The results were as follows. Knitwears quality factors were classified into six subdivisions by factor analysis; physical functions, yarn and fabric properties, fit, symbol, aesthetic, and usefulness. Quality attributes in purchasing knitwears were considered importantly in order of design, textures, color, price, size, and shape stability, etc. Among quality attributes on knitwears, there were significant differences in importance degree and satisfaction degree; important degree was higher than satisfaction degree to six factors on knitwears quality. Especially, in graph according to gap analysis, physical function and symbol were included in IV area, attributes that attention, required of quality improvement. In contrast, yarn and fabric properties, fit, aesthetic, and usefulness were included in I area, strengths, maintained presently quality levels.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.503-506
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• 2004

In this paper, we suggest a new driving waveform for stable address discharge in AC PDP without the reduction of contrast ratio. To analyze the influence of cross-talk between discharge and non-discharge cells and verify that proposed waveform shows a stable address discharge, we measured the address discharge delay time. The proposed waveform shows the reduction of the cross-talk and concurrently the improvement of address voltage margin compared with those of selective reset waveform having one reset period in 1TV-Field..

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2002년도 봄 학술발표논문집 Vol.29 No.1 (A)
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• pp.679-681
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• 2002

본 논문에서는 화질 향상을 위한 콘트라스트 조정 기법을 제안한다. 제안한 방식은 기존의 알고리즘을 단순화하여서 실시간 처리가 가능하며 콘트라스트의 범위를 조정하는 가중치를 두었다. 연산을 함에 있어 기준이 되는 값을 선언하여 콘트라스트의 효율적인 조정과 오차율을 줄였다. 제안한 방식에 의한 처리 결과와 원 영상의 화질 평가를 위해 시각적 검증과 히스토그램의 표준 편차를 도입 하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제32권2호
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• pp.183-191
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• 2019

Objective: The purpose of this study was to compare intended and actual yearly genetic gains for milk production and conformation traits and to investigate the simple selection criterion practiced among milk production and conformation traits during the last two decades in Japan. Learning how to utilize the information on intended and actual genetic gains during the last two decades into the genomic era is vital. Methods: Genetic superiority for each trait for four paths of selection (sires to breed bulls [SB], sires to breed cows [SC], dams to breed bulls [DB], and dams to breed cows [DC]) was estimated. Actual practiced simple selection criteria were investigated among milk production and conformation traits and relative emphasis on milk production and conformation traits was compared. Results: Selection differentials in milk production traits were greater than those of conformation traits in all four paths of selection. Realized yearly genetic gain was less than that intended for milk production traits. Actual annual genetic gain for conformation traits was equivalent to or greater than intended. Retrospective selection weights of milk production and conformation traits were 0.73:0.27 and 0.56:0.44 for intended and realized genetic gains, respectively. Conclusion: Selection was aimed more toward increasing genetic gain in milk production than toward conformation traits over the past two decades in Japan. In contrast, actual annual genetic gain for conformation traits was equivalent to or greater than intended. Balanced selection between milk production and conformation traits tended to be favored during actual selection. Each of four paths of selection (SB, SC, DB, and DC) has played an individual and important role. With shortening generation interval in the genomic era, a young sire arises before the completion of sire's daughters' milk production records. How to integrate these four paths of selection in the genomic era is vital.

• 대한기관식도과학회지
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• 제9권1호
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• pp.60-66
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• 2003

Although there is a wide range of diseases caused by gastric acid reflux and the number of cases is on the rise, it is difficult for the laryngologist to make the correct diagnosis. The treatment for laryngopharyngeal reflux can be grouped into 3 categories - changes in lifestyle, medication, and surgery. The medication used to treat laryngopharyngeal reflux are prokinetic agents and acid supressive agents such as antacids, H2 blockers, and PPIs(Proton pump inhibitor). Rabeprazole sodium($Pariet^{\circledR}$) is a newly developed agent belonging to the PPI group, but in contrast with the existing drugs such as omeprazole, lansoprazole, pantoprazole, has a low dependency on CYP2C19 during the metabolic cycle. Thus, it is known to have a quick but fixed antiacid effect and less individual differences. We analyzed 2166 patients from 32 hospitals who were prescribed $Pariet^{\circledR}$ from May, 2001 to April, 2002. The patients were divided into 4 groups according to the duration of treatment - Group 1: 1-14 days, Group 2: 15-28 days, group 3: 29-56 days, Group 4: more than 56 days. The cases were then analyzed for improvement of 8 symptoms(heart bum, regurgitation, chronic cough, hoarseness, globus sensation, chronic throat clearing, sore throat, and dysphagia), improvement on laryngoscope, usefulness to the doctor, and complication development. Of the total of 2116 patients, 1627(75.1%) cases showed at least 50% improvement of symptoms and the amount of improvement increased according to the duration of medical treatment. Most of the patients showed objective improvement on the laryngoscope, with 32.9% showing significant improvement and 38.7% showing moderate improvement. 37.6% of the doctors questioned replied that $Pariet^{\circledR}$ was very useful and 50.3% said it was useful, showing that most were satisfied with the treatment results. The complications known to develop after taking PPI are headache, nausea, diarrhea, abdominal pain, constipation, dizziness, fatigue, and of these, only a small percentage of the patients complained of mild headache. $Pariet^{\circledR}$ has shown to be a relatively safe and effective drug for the treatment of laryngopharyngeal reflux.

• 핵의학기술
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• 제17권2호
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• pp.53-58
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• 2013

본 연구에서는 각기 다른 에너지의 방사성동위원소를 이용하여 CT를 기초로 한 attenuation correction (AC)과 scatter correction (SC)을 적용했을 때 영상의 질을 비교분석하고 영상보정기법의 유용성에 대해 알아보고자 하였다. Resolution 평가를 위해 사용된 spatial resolution phantom 내부에 물을 채우고 각각의 동위원소 $^{99m}Tc$ (140 keV, 2.22 kBq), $^{201}Tl$ (70 keV, 2.22 kBq), $^{131}I$ (364 keV, 2.22 kBq)을 line에 주입하여 제작하였다. Contrast 평가를 위해 이용한 Jaszczak phantom은 배후방사능과 열소원통의 비율이 1:8이 되도록 각각의 동위원소를 주입하여 제작하였다. GE Infinia Hawkeye4 SPECT/CT (GE Medical System, USA)로 영상을 획득하고, non-correction (NC), AC, SC, AC와 SC가 동시에 적용된(ACSC) 4가지 조건으로 OSEM (2 iterations, 10 subsets)을 이용하여 영상을 각각 재구성하였다. FWHM값은 paired samples t-test를 통하여 유의수준 관계를 분석하였고, percent contrast (%)값은 MATLAB (Ver.7.0)$^{(R)}$과 MRIcro$^{(R)}$를 이용하여 각각의 수치를 비교하였다. $^{99m}Tc$의 resolution test에서 NC, AC, SC, ACSC를 각각 적용했 을 때 FWHM (mm)값은 각각 $4.97{\pm}0.46$, $4.73{\pm}0.27$, $49.7{\pm}0.39$, $4.60{\pm}0.26$, $^{201}Tl$에서는 $5.26{\pm}0.28$, $5.14{\pm}0.21$, $5.25{\pm}0.25$, $5.05{\pm}0.23$, $^{131}I$에서는 $6.24{\pm}0.73$, $5.84{\pm}0.57$, $6.24{\pm}0.69$, $5.98{\pm}0.52$의 값을 얻을 수 있었다. 각 방사성 동위원소의 결과 값에서 NC와 비교하여 AC, ACSC를 적용했을 때 통계적으로 유의한 차이를 보였고(P<0.05), SC만을 적용했을 때는 유의한 차이가 없음을 보여주었다(P>0.05). Contrast test에서는 percent contrast(%) 를 4개의 원통에 대한 값을 구했고, NC와 비교했을 때 AC, SC, ACSC의 percent difference (%)가 $^{99m}Tc$은 24.73, 38.10, 67.31, $^{201}Tl$은 30.90, 51.82, 86.02, $^{131}I$에서는 18.60, 46.26, 73.67의 차이를 보였다. 본 연구의 결과에 따르면 $^{99m}Tc$, $^{201}Tl$ 과 같은 낮은 에너지를 가진 핵종에 대해서는 ACSC를 동시에 적용한 영상에서 resolution 향상이 가장 크게 나타났지만, $^{131}I$ 같은 높은 에너지의 핵종에서는 AC만 적용되었을 때 ACSC를 적용했을 때보다 영상의 질이 더 향상됨을 알 수 있었다. 그러므로 SPECT/CT 검사 시 사용되는 핵종의 에너지에 따라 적절한 영상보정기법을 적용한다면 정확한 진단을 위한 최적의 영상을 얻을 수 있을 것으로 사료된다.

• 한국화재소방학회논문지
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• 제20권4호
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• pp.42-57
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• 2006

본 연구는 소방방재 행정서비스의 예방업무를 민간마인드와 대비, 심도있는 분석을 통하여 현재 안전점검기관의 분산 중복관리, 수수료징수의 부적성, 관계인의 도덕적 해이 만연, 부조리요인 잠재, 전문성확보 미흡 등의 문제점을 단계적 통합안전점검 시스템 구축, 소방검사의 일원화, 예방업무의 기업성 확보, 안전분야 자격증취득강화, 민관파트너십 활성화 등의 소방방재서비스 개선방안을 제시하였다.