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표정요소 없는 다중 UAV영상의 대응점 추출 후보군 구성방법 비교
정종원 ( Jongwon Jung ),김태정 ( Taejung Kim ),김재인 ( Jaein Kim ),이수암 ( Sooahm Rhee ) 대한원격탐사학회 2016 大韓遠隔探査學會誌 Vol.32 No.6
UAV의 발전에 따라 UAV영상의 활용도 늘어나고 있다. 다양한 UAV영상 기반의 어플리케이션에 점진적 번들 조정방법이 널리 사용된다. 그러나, 점진적 번들조정 방법은 중복이 없는 영상 쌍에서도 대응점을 추출해 긴 시간을 소요하게 된다. 이 과정을 효율적으로 처리하기 위해서는 중복지역에서만 대응점 추출 연산을 진행해야한다. 만약 영상의 외부표정요소가 있을 경우 이를 기준으로 영상의 중복도를 계산하여 중복지역에서만 대응점 추출이 일어나도록 제한할 수 있다. 그러나 외부표정요소가 없는 영상을 활용하는 경우, 기하학적인 중복지역을 계산할 수 없으므로 다른 후보군 구성 방법의 적용이 필요하다. 본 논문에서는 외부표정 요소가 없는 경우의 대응점 추출 후보군 구성 방법들을 비교해 가장 효율적인 방법을 찾는다. 비교 방법은 일부 특징점, 특징점 군집화, 영상의 밝기를 활용한 후보군 구성방식이며 외부표정요소를 통해 구한 대응점 후보군 구성결과를 기준으로 각 방식을 비교한다. 비교 결과 일부 특징점을 활용하는 것이 가장 효율적으로 나타났다. Growth of UAV technology leads to expansion of UAV image applications. Many UAV image-based applications use a method called incremental bundle adjustment. However, incremental bundle adjustment produces large computation overhead because it attempts feature matching from all image pairs. For efficient feature matching process we have to confine matching only for overlapping pairs using exterior orientation parameters. When exterior orientation parameters are not available, we cannot determine overlapping pairs. We need another methods for feature matching candidate constitution. In this paper we compare matching candidate constitution methods without exterior orientation parameters, including partial feature matching, Bag-of-keypoints, image intensity method. We use the overlapping pair determination method based on exterior orientation parameter as reference. Experiment results showed the partial feature matching method in the one with best efficiency.
바이오폴리머를 포함한 모래지반의 흙-습윤 특성곡선 연구
정종원(Jongwon Jung) 한국지반환경공학회 2018 한국지반환경공학회논문집 Vol.19 No.10
흙-습윤 특성곡선은 불포화토에서 물의 흐름, 다상유체에서의 상대투수계수, 그리고 흙의 강성 및 부피 변화를 이해하는데 필수적이다. 바이오폴리머는 미생물에 완전 분해가 가능한 자연에 무해한 친환경 물질이다. 따라서, 치토산, 폴리에틸렌 옥사이드, 잔탄검, 알지네이트염 및 폴리아크릴산 등과 같은 바이오폴리머가 지반복원, 지반성능향상 및 오일생산증진을 위해 연구되어왔다. 폴리아크릴산(polyacrylic acid)은 바이오폴리머의 일종으로, 유체의 흐름 특성 향상을 통하여 오일생산증진 및 지반복원 등의 분야에서 우수한 성능을 보여왔다. 따라서, 본 연구에서는 폴리아크릴산(polyacrylic acid)을 포함한 모래의 흙-습윤 특성곡선의 이해하기 위해서 실내시험을 수행하고, 이론적 모델의 매개변수 변화를 연구하였다. 그 결과, 폴리아크릴산(polyacrylic acid)의 농도가 증가함에 따라, 포화된 모래에 주입되는 공기의 주입 모세관압력이 증가함을 보이고, 높은 모세관압력에서의 잔류 함수비 역시 증가하고 있음을 보였다. 또한, 이론식 모델의 매개변수를 구하였으며, 이를 활용한 흙-습윤 특성곡선이 실내 실험 결과와 잘 일치하고 있음을 보였다. 따라서, 이론적 모델의 매개변수를 알고 있으면, 본 연구에서 활용된 폴리아크릴산(polyacrylic acid)이외의 바이오폴리머를 포함한 모래 지반의 흙-습윤 특성곡선이 예측이 가능함을 설명하였다. Soil-water characteristic curve, which is called soil retention curve, is required to explore water flows in unsaturated soils, relative permeability of water in multi-phase fluids flow, and change to stiffness and volume of soils. Thus, the understanding of soil-water characteristic curves of soils help us explore the behavior of soils inclduing fluids. Biopolymers are environmental-friendly materials, which can be completely degraded by microbes and have been believed not to affect the nature. Thus, various biopolymers such as deacetylated power, polyethylene oxide, xanthan gum, alginic acid sodium salt, and polyacrylic acid have been studies for the application to soil remediation, soil improvement, and enhanced oil recovery. PAA (polyacrylic acid) is one of biopolymers, which have shown a great effect in enhanced oil recovery as well as soil remediation because of the improvement of water-flood performance by mobility control. The study on soil-water characteristic curves of sandy soils containing PAA (polyacrylic acid) has been conducted through experimentations and theoretical models. The results show that both capillary entry pressure and residual water saturation dramatically increase according to the increased concentration of PAA (polyacrylic acid). Also, soil-water characteristic curves by theoretical models are quite well consistent with the results by experimental studies. Thus, soil-water characteristic curves of sandy soils containing biopolymers such as PAA (polyacrylic acid) can be estimated using fitting parameters for the theoretical model.
Choi, Jongwon,Lee, Kyung-Tae,Choi, Moo-Young,Nam, Jung-Hwan,Jung, Hyun-Ju,Park, Sun-Kyu,Park, Hee-Juhn Pharmaceutical Society of Japan 2005 BIOLOGICAL & PHARMACEUTICAL BULLETIN Vol.28 No.10
<P>The root of <I>Morinda officinalis</I> (Rubiaceae) is used to treat rheumatoid arthritis and impotence in the traditional Oriental medicine. To identify the antinociceptive anti-inflammatory components of this crude drug, we adopted an activity-directed fractionation approach. The active fraction of the BuOH extract of <I>M. officinalis</I> root was subjected to silica gel and ODS column chromatography to yield two diterpenes, compounds 1 and 2 and these were identified as monotropein and deacetylasperulosidic acid, respectively. The iridoid glycoside, monotropein, was tested for its anti-inflammatory antinociceptive effects using hot plate- and writhing antinociceptive assays and by using carrageenan-induced anti-inflammatory assays in mice and rats. Pretreatment with monotropein (at 20, 30 mg/kg/d, <I>p.o.</I>) significantly reduced stretching episodes and prolonged action time in mice. It also significantly reduced acute paw edema by carrageenan in rats. These results indicate that monotropein contributes to the antinociceptive and anti-inflammatory action of <I>Morinda officinalis</I> root.</P>
Jeon, Hee Jung,Kim, Yong Chul,Park, Seokwoo,Kim, Clara Tammy,Ha, Jongwon,Han, Duck Jong,Oh, Jieun,Lim, Chun Soo,Jung, In Mok,Ahn, Curie,Kim, Yon Su,Lee, Jung Pyo,Kim, Young Hoon American Society of Nephrology 2017 CLINICAL JOURNAL- AMERICAN SOCIETY OF NEPHROLOGY Vol.12 No.4
<P>Conclusions Serum phosphorus level 1 year after transplantation exhibits a U-shape association with death censored graft failure and patient mortality in kidney transplant patients characterized by relatively high rate of living donor transplant and low incidence of diabetes and prior cardiovascular disease compared with Western countries.</P>
정인목(In Mok Jung),한소리(So Rhee Han),최금희(Keum Hee Choi),권유진(Yujin Kwon),이태승(Taeseung Lee),민승기(Seung-Kee Min),박양진(Yang Jin Park),정중기(Jung Kee Chung),하종원(Jongwon Ha),김상준(Sang Joon Kim) 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.79 No.6
Purpose: Although progenitor cells may contribute to intimal hyperplasia (IH) after arterial injury, positive contribution of IH is variable with type of injury or cells. This study was designed to examine whether differentiated muscle derived stem cells (MDSC) attenuate IH in rat. Methods: MDSCs were retrieved using preplate techniques from rat calf muscle and MDSCs (preplate 6th culture fraction, pp6) were exposed to VEGF (50 ng/㎖) for endothelial differentiation prior to injection. Male rats were divided into two groups (cell treated vs. control) and underwent carotid balloon injury with 2-Fr catheter. The virus containing Green fluorescent protein (GFP) gene was transfected into cells for monitoring. Cells (5×10?) were indwelled into carotid artery for 30 minutes after injury and then blood flow was restored. Arteries were harvested at various intervals (1, 2 and 4 weeks) after injury. The intima to media thickness ratio (IMTR) was calculated with morphometric analysis. Results: Endothelial surface markers such as VE-CADHERIN were strongly expressed on differentiated MDSCs. At 4 weeks after injury, IH was predominantly observed in control group compared to cell treated group. The intensity of GFP was strongly observed at 1 week and declined at 4 weeks in carotid artery wall at MDSC group. CD31(+) endothelial cells were observed at MDSC group compared to control. The mean IMTR in cell treated groups were significantly lower than control at 2 weeks (P=0.005) and 4 weeks (P≤0.001). Conclusion: Our study demonstrates that MDSCs therapy promotes re-endothelialization and leads to attenuation of IH after balloon injury in rat.
LEE, KYUNG-TAE,CHOI, JONGWON,JUNG, WON-TAE,NAM, JUNG-HWAN,JUNG, HYUN-JU,PARK, HEE-JUHN WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2002 東西醫學硏究所 論文集 Vol.2002 No.-
We isolated a new saponin named codonoposide (1) from the roots of Codonopsis lanceolata (Campanulaceae) and characterized it as 3-O-[β-D-xylopyranosyl(1-3)-β-D-glucuronopyranosyl]-3β,16α-dihydroxyolean-28-oic acid 28-O-[β-D-xylopyranosyl(1-3)-α-L-rhamnopyranosyl(1-2)-α-L-arabinopy-ranosyI] ester by chemical, physicochemical, and 2DNMR techniques. Complete hydrolysis of 1puduced a sapogenin (1a), and the partial hydrolysis and further isolation afforded two prosapogenins (1b, Ic). The structures of la, 1b, and 1c were found to be 3β, 16α-dihydroxyolean-28-oic acid (echinocystic acld, 1a), 3-0-β-D-g1ucuronopyranoside of 1a, and 3-0-β-D-xylopyranosyl (1-3)-β-D-glucuronopyranoside of la, respectively, on the basis of spectroscopic data. On MTT assay, la showed marginal cytotoxic activity whereas 1b exhibited more cytotoxicoty than 1a. However, the bisdesmo-sylsaponin 1 exhibited no cytotoxicity (IC_50>0.3 mM against tested cell lines). This result indicated that glycoside linkage of glucuronic acid at C-3 enhances the cytotoxicity of sapogenin (la), and additive glycosylation of xylose to 1b strongly enhances the cytotoxicity of 3-0-monosaccharides (1b). Therefore, true forms of codonoposide for the cytotoxicity must be sapogenins or prosapogenins.