눈물길 신티그라피의 양상에 따른 실리콘관 삽입술의 치료효과 비교

이승욱,김은희,이지은,이종수.Seung Uk Lee. M.D.. Eun Hee Kim. M.D.. Ji Eun Lee. M.D.. Jong Soo Lee. M.D. 대한안과학회 2006 대한안과학회지 Vol.47 No.6

Purpose: To evaluate clinical outcome of silicone tube intubation in lacrimal passage obstruction according to the lacrimal passage obstruction patterns by dacryoscintigraphy. Methods: Fifty-nine eyes of 52 patients complaining of epiphora were divided into three groups pre-sac (group 1), intra-sac (group 2), and intra-ductal (group 3) types by dacryoscintigraphy. We confirmed the obstructive sites of lacrimal passage by probing with Bowman probe, and excluded all the cases of not passing lacrimal pathway or without the obstruction of lacrimal pathway. In the silicone intubation, a tie between both silicone tube was made at silicone silastic sheet instead of Mersilk. Results: The success was defined as maintaining the patent lacrimal passage with irrigation and disappearing of epiphora for at least 3 months. The success rate of the silicone intubation was 16 eyes of 17 eyes (94.1%) in group 1, 19 eyes of 23 eyes (82.6%) in group 2, and 14 eyes in 19 eyes (73.7%) in the group 3. The highest success rate of silicone intubation was pre-sac type and the lowest success rate was intra-ductal type by dacryoscintigraphy. There is no significant difference of success rate among three groups. Conclusions: Although it`s required the longer follow-up period and larger subjects to evaluate the efficacy of silicone tube intubation, it should be useful management of silicone tube intubation, especially at the cases of pre-sac obstruction by dacryoscintigraphy.

2형 오브스캔 각막지형도를 이용한 원추각막과 원추각막의증의 각막형태비교

이승욱,이창환,이지은,이종수,Seung Uk Lee,Chang Hwan Lee,Ji-Eun Lee,Jong Soo Lee 대한안과학회 2007 대한안과학회지 Vol.48 No.12

Purpose: To compare corneal topographic changes using Orbscn II between keratoconus and keratoconus- suspected eyes. Methods: Thirty-seven keratoconus eyes, 17 keratoconus-suspected eyes and 37 normal eyes were evaluated by using Orbscan II corneal topography. We compared central phachymetry, anterior elevation from best-fit sphere (BFS), posterior elevation from BFS, most protruded corneal thickness, central corneal thickness, anterior chamber depth, corneal diameter, and pupil size. Results: Central pachymetry, anterior and posterior elevation from BFS, central corneal thickness, and anterior chamber depth were statistically significantly different between keratoconus and control eyes. Anterior elevation from BFS showed a significant difference between keratoconus-suspected and control eyes. There were statistically significant differences in central pachymetry, posterior elevation from BFS, central corneal thickness and most protruded corneal thickness between keratoconus and keratoconus-suspected eyes. Corneal diameter and pupil size showed no differences among the 3 groups. Conclusions: Suspected keratoconus eyes have a higher value of anterior elevation from BFS on Orbscan II topography as compared with control eyes. Central pachymetry, posterior elevation from BFS, central corneal thickness and most protruded corneal thickness may be helpful in distinguishing between keratoconus and keratoconus-suspected eyes.

재래식 및 개량식 된장의 아이소플라본 분포 및 $\beta$-glucosidase 활성 연구

이승욱,박영우,장판식,이재환,Lee, Seung-Wook,Park, Yong-Woo,Chang, Pahn-Shick,Lee, Jae-Hwan 한국식품과학회 2010 한국식품과학회지 Vol.42 No.2

숙성기간이 다른 재래식 된장 12종과 개량식 된장 4종의 아이소플라본과 $\beta$-glucosidase 활성도를 비교하였다. 재래식 된장의 전체 아이소플라본 함량(TI)은 $370-723\;{\mu}g/g$이었고, 개량식 된장은 $179-537\;{\mu}g/g$으로 유의적으로 낮은 함량을 보였다. 된장의 주요 아이소플라본은 비배당체 형태였으며 재래식 된장의 경우 42.98-89.96%, 개량식 된장은 35.51-93.48%이었다. 아이소플라본 함량 분포에 대한 주성분 분석 결과 재래식 된장은 개량식 된장과 차별화가 가능하였다. 개량식 된장의 경우 $\beta$-glucoside 형태는 검출되지 않았는데 이는 과도한 열처리를 받았거나 발효에 관여한 미생물의 $\beta$-glucosidase 활성이 높았음을 의미한다. 된장시료에서 $\beta$-glucosidase 활성도는 날콩에 비해 낮았으며 재래식 및 개량식 된장간에 유의적인 차이 및 아이소플라본의 분포와의 상관관계는 명확하지 않았다. Isoflavone distribution and $\beta$-glucosidase activity in 16 commercially available doenjang samples were determined. Twelve of the samples were home-made doenjang (HMD) with a relatively long fermentation period and 4 of the samples were factory-produced doenjang (FPD) from four different manufactures. Total isoflavones (TI) in the HMD ranged from $370-723\;{\mu}g/g$, while those in FPD ranged from $179-537\;{\mu}g/g$. The isoflavone distribution in HMD was different from those in FPD. Generally, the TI in HMD was higher than those in FPD. The major isoflavone was aglycones, which ranged from 42.98 to 89.96% in HMD and from 35.51 to 93.48% in FPD. Isoflavones in the $\beta$-glucoside forms were not detected in tested FPD samples. Principal components analysis (PCA) of the isoflavone profiles showed that HMD were differentiated from FPD. First principal component (PC1) and second principal component (PC2) expressed 43.6 and 22.9% of the data variability, respectively. $\beta$-Glucosidase activity in doenjang was lower than that in raw soybeans. The results of this study can be used to understand the differences in the isoflavone distribution in traditionally manufactured and factory produced doenjang.

고속 스위칭 Voltage Down Converter 회로 설계에 대한 연구

이승욱,김명식,Lee, Seung-Wook,Kim, Myung-Sik 대한전자공학회 2001 電子工學會論文誌-SC (System and control) Vol.38 No.2

본 논문은 IC chip내에서 전압을 낮추는 목적으로 사용되는 VDC 회로의 주파수 특성을 향상시키기 위한 새로운 회로를 제안한다. 제안된 회로에는 적응 바이어싱 방법을 통해 저전력소모 및 고속동작을 동시에 만족하는 두 개의 센서와 이 센서로 구동되는 3개의 transistor가 부가적으로 첨가되어 구동 transistor의 gate 충.방진 전류를 보상하여 구동회로의 정상동작을 유지시켜준다. 본 연구에 사용된 회로는 $0.62{\mu}m$ N well CMOS 공정을 사용하였으며, H spice simulation 결과, 내부전압의 변화폭은 부하전류가 0에서 $200m{\Lambda}$까지 5ns동안 증가할 경우 약 1.0V로, $200m{\Lambda}$에서 0으로 감소할 경우 약 0.6V로, 내부전압 회복시간은 증가시 7ns, 감소시 10ns로, 일반적인 구동방식에 비해 성능이 향상되었으며 전체 회로에 소모하는 power는 약 1.2mW로 매우 작았다. This paper presents a new voltage down converter(VDC) using charge and discharge current adjustment circuitry that provides high frequency application. This VDC consist of a common driving circuit and compensation circuits: 2 sensors and each driving transistors for controlling gate current of driving transistor. These sensors are operated as adaptive biasing method with high speed and low power consumption. This circuit is designed with a $0.62{\mu}m$ N well CMOS technology. In H-spice simulation results, internal voltage is bounded ( IV, +0.6V) in proposed circuitry when load current rapidly increases and decreases during Gns between 0 and $200m{\Lambda}$. And the recovery time of internal voltage is about 7ns and 10ns when load current increases and decreases respectively. That is fast better than common driving circuit. Total power consumption is about 1.2mW.

차세대 e-러닝 서비스-e-러닝 시스템을 중심으로

이승욱,김용훈,서희전,김진호,문경애,Lee, S.W.,Kim, Y.H.,Seo, H.J.,Kim, J.H.,Moon, K.A. 한국전자통신연구원 2005 전자통신동향분석 Vol.20 No.4

IT 기술을 이용하여 학습하는 것을 e-러닝이라 한다. 최초의 e-러닝은 DistanceLearning과 Distributed Learning이라는 두 가지 측면만으로도 훌륭한 역할을 하였다. 그러나 최근 정보통신산업의 비약적인 발전에 따라 새로운 e-러닝 서비스에 대한 사용자의 요구가 높아지고 있다. 무선 이동통신기술과 하드웨어기술 등의 발전에 따라 언제 어디서나 양질의 교육에 접근할 수 있고, 멀티미디어 처리기술의 발전에 따라 개인맞춤형 e-러닝 서비스가 필요하다. 이에 따라 본 기고에서는 e-러닝 시스템이라는 측면에서 차세대 e-러닝 서비스를 구상하고자 한다.

디지털콘텐츠 - 3D 그래픽스 압축 기술 및 표준화 동향

이승욱,Lee, Seung-Uk 한국정보통신기술협회 2012 TTA저널 Vol.144 No.-

IEC 100주년과 한국의 표준화

이승욱,Lee, Seung-Uk 기술표준원 2006 기술표준 Vol.51 No.-

전력기기용 NANO 소재 현황

이승욱,이종호,오일성,Lee, Seung-Uk,Lee, Jong-Ho,O, Il-Seong 한국전기전자재료학회 2009 전기전자재료 Vol.22 No.3

인공지능을 이용한 3D 콘텐츠 기술 동향 및 향후 전망

이승욱,황본우,임성재,윤승욱,김태준,김기남,김대희,박창준,Lee, S.W.,Hwang, B.W.,Lim, S.J.,Yoon, S.U.,Kim, T.J.,Kim, K.N.,Kim, D.H,Park, C.J. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.4

Recent technological advances in three-dimensional (3D) sensing devices and machine learning such as deep leaning has enabled data-driven 3D applications. Research on artificial intelligence has developed for the past few years and 3D deep learning has been introduced. This is the result of the availability of high-quality big data, increases in computing power, and development of new algorithms; before the introduction of 3D deep leaning, the main targets for deep learning were one-dimensional (1D) audio files and two-dimensional (2D) images. The research field of deep leaning has extended from discriminative models such as classification/segmentation/reconstruction models to generative models such as those including style transfer and generation of non-existing data. Unlike 2D learning, it is not easy to acquire 3D learning data. Although low-cost 3D data acquisition sensors have become increasingly popular owing to advances in 3D vision technology, the generation/acquisition of 3D data is still very difficult. Even if 3D data can be acquired, post-processing remains a significant problem. Moreover, it is not easy to directly apply existing network models such as convolution networks owing to the various ways in which 3D data is represented. In this paper, we summarize technological trends in AI-based 3D content generation.

과체(瓜?)를 이용한 토법(吐法)의 안전성에 대한 후향적 연구 : 임상반응, 간기능, 신기능을 중심으로 한 평가

이승욱,설미현,나현영,유정화,안영민,이병철,안세영,Lee, Seung-wook,Seol, Mi-hyeon,Na, Hyun-young,Yoo, Jeong-hwa,Ahn, Young-min,Lee, Byung-cheol,Ahn, Se-young 대한한방내과학회 2015 大韓韓方內科學會誌 Vol.36 No.4

Objectives This study was conducted to report the safety of vomit-inducing treatment (Tu Fa, 吐法) by Melonis Calyx, particularly with respect to clinical features and liver and kidney functions.Methods Patients treated with Melonis Calyx powder between September 2013 and September 2014 were assessed retrospectively.Results Less than 3 grams of Melonis Calyx powder can induce mild abdominal discomfort and produce no harmful effects on liver and kidney functions.Conclusions Through this study, a vomit-inducing treatment using less than 3 grams of Melonis Calyx can be considered safe enough to be used in clinics, with a cautious approach with respect to dehydration.