확률적인 소실점 추정 기법에 기반한 강인한 송전선 검출 방법

유주한(Ju Han Yoo),김동환(Dong Hwan Kim),이석(Seok Lee),박성기(Sung-Kee Park) 한국로봇학회(논문지) 2015 로봇학회 논문지 Vol.10 No.1

레벨셋 기법을 이용한 컬러 이미지 분할

유주한(Yoo Ju Han),정문열(Jung Moon Ryul) 한국컴퓨터그래픽스학회 2012 컴퓨터그래픽스학회논문지 Vol.18 No.2

본 논문은 컬러 이미지를 의미 있는 영역으로 분할 하기 위한 새로운 방법을 제시한다. 본 연구에서, 의미 있는 영역을 이미 지에서 많이 등장하는 색을 가지고 있는 영역이라고 정의하고, 많이 등장하는 색들을 파악하기 위해서 주어진 이미지를 RGB 공간에서 컬러 점들의 집합으로 표현한다. 그리고 본 기법에서 정의한 점들의 밀도를 이용하면, RGB 공간에서 점들의 밀도가 높은 영역에 속한 컬러들이 이미지에서 많이 등장하는 컬러라고 볼 수 있게 된다. 결국, 새롭게 제시하는 레벨셋 함 수를 이용하여 RGB 공간에서 점들의 밀도가 높은 영역들을 찾음으로써 이미지에서 의미 있는 영역을 구분해 낼 수 있지만, 이미지에서 의미 있는 영역(점들의 밀도가 높은 영역)을 구성하고 있는 컬러들이 충분한 크기의 연속된 영역을 이룰 만큼 인접해 있지 않으면, 의미 있는 영역이라고 볼 수 없으므로, 그러한 픽셀들은 이웃 영역에 포함시키게 된다. 본 논문에서 새 롭게 제시하는 방법은, RGB 공간에서 컬러들의 밀도 분포를 레벨셋 함수에 적용해서 영역을 분할하고 이를 이미지공간으 로 다시 매칭 시키는 방법으로, 이미지상에 레벨셋 함수를 직접 정의하고 이를 이용하여 이미지 영역분할을 하는 기존의 레 벨셋 기반의 이미지 분할 방법과는 차이가 있다. In this paper, we propose a method to segment a color image into several meaningful regions. We suppose that the meaningful region has a set of colors with high frequency in the color image. To find these colors, the color image is represented as several sets of color points in RGB space. And when we use the density of points defined in this method, color belonging to a dense region of color points in RGB space refers to the color that appeared frequently in the image. Eventually, we can find meaningful regions by looking for regions with high density of color points using our level set function in RGB space. However, if a meaningful region does not have a contiguous region of the sufficient size in the image, this is not a meaningful region but meaningless region. Thus, the pixels in the meaningless region are assigned to the biggest meaningful region belonging to its neighboring pixels in the color image. Our method divides the color image into meaningful regions by applying the density of color points to level set function in RGB space. This is different from the existing level set method that is defined only in 2D image.

Cypermethrin과 Methomyl 저항성 집파리의 교처저항성과 Cypermethrin 저항성에 대한 연관군 분석

유주,박정규,이시우,최병렬,Yoo, Ju,Park, Chung-Gyoo,Lee, Si-Woo,Choi, Byeong-Ryeol 한국응용곤충학회 2001 한국응용곤충학회지 Vol.40 No.4

The house fly (Musca domestica L.) strains were derived from the Yumenoshima III strain by selecting with cypermethrin and methomyl for 19 and 16 generations, respectively. The resulting strains, cypermethrin resistance strain (Cyp-R19) and methomyl resistance strain (Met-R16), showed high level of resistance by 12906 and 51 times, respectively, comparing with the susceptible SRS strain. The Cyp-R19 strain was resistant to synthetic pyrethroids such as deltamethrin, esfenvalerate, fenpropathrin, $\beta$-cyfluthrin, showing > 11000, 1231, 103, 292 times higher $LD_{50}$ values than the SRS strain, respectively. It was also resistant to 3 organophosphates and 2 carbamates such as fenitrothion, profenofos, pyridaphenthion, benfuracarb, methomyl, showing resistance ratios fo 51, 17, 49, 39 and 62 comparing to SRS strain. The Met-R16 strain was resistant to synthetic carbamate benfuracarb, showing 6 times higher $LD_{50}$ value than SRS strain. It was also resistant to 4 organophosphates such as acephate, fenitrothion, profenofos and pyridaphenthion, showing > 40, 103, 19, 60 times higher $LD_{50}$ value. It was also resistant to 5 pyrethroids and a pyrrole such as cypermethrin, deltamethrin, esfenvalerate, fenpropathrin, $\beta$-cyfluthrin and chlorfenapyr, showing 3030, 249, 4063, 34, 330 and 86 times higher $LD_{50}$ values than the SRS strain. Cyp-R14 strain which was selected for 14 generations by cypermethrin and developed 11014 times higher resistance to the SRS strain was used in the dominance and linkage group analysis. Cypermethrin resistance inheritance was incompletely dominant in house fly as judged by the reciprocal cross between the resistant and susceptible strains. The linkage group analysis for the major factors responsible for this resistance was carried out by the$ F_1$male-backcross method, using susceptible multi-chromosomal marker aabys strain. The major factors for cypermethrin resistance were located on the 1st, the 3rd and the 4th chromosomes, and the effect of the 3rd chromosome was most prominent.

딥러닝기반 Image Segmentation 모델을 이용한 포장표면 균열 검출 방법 연구

이현남(Hyunnam Lee),유주한(Ju Han Yoo),김종호(Jong-Ho Kim),조남현(Nam-Hyun Cho) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.6

미선나무(Abeliophyllum distichum)의 식물체 재생 및 캘루스 유기에 미치는 생장조절제의 영향

진연희(Yeon Hee Jin),유주한(Ju han Yoo),장혜원(Hee Won Jang),조흥원(Cho Heong Won),이철희(Cheol Hee Lee) 한국원예학회 2003 한국원예학회 학술발표요지 Vol.2003 No.5

제주도 설록다원에서의 관행재배와 유기농재배 간 해충 발생 비교

유주(Ju Yoo),이진호(Jin-Ho Lee),이민석(Min-Seouk Lee),이정대(Jung-Dae Lee),임유진(Yu-Jin Lim),김동순(Dong-Sun Kim),박정규(Chung-Gyoo Park) 한국차학회 2012 한국차학회지 Vol.18 No.4

A comparative study between a conventional and organic spray program was conducted in terms of the abundances of arthropod pests. The tea red spider mite (Tetranychus kanzawai Kishida) populations were abundant in the 1st and 2nd tea growing season, and there was no significantly difference between the two spray programs. The density of the tea green leafhopper (Empoasca onukii Matsuda) was low in the 1st tea growing season, whereas it was high in the 2nd growing season in most cases. In the 2nd tea growing season, the density of this pest was higher in the years with the organic spray program than in the years with the conventional spray program. On the other hand, its abundance was low in the 3rd tea growing season. Therefore, additional management tactics are required in the 2nd tea growing season. Yellow tea thrips (Scirotothrips dorsalis Hood) were observed during the full seasons from late April to late October in tea farms. In the conventional spray program, there was a higher density in the 2nd and 3rd tea growing seasons. On the other hand, its population densities were regulated at a low level after converting to the organic spray program. Oriental tea tortrix (Homona magnanima Diakonoff) showed 4 times peak occurrence a year. Monitoring of the adult flight activity of the moth using sex pheromone traps revealed a sharp decrease in the catches after adopting the organic spray program; possibly due to the activity of hymenopteran parasitiods. The tea leaf roller (Caloptilia theivora Walsingham) showed 5 times of peak occurrence in a year. The population abundances increased considerably after converting to an organic spray program. Stink bug damage occurred after an organic cultivation period of the 1st tea growing season. Stink bugs of 11 species were observed during organic cultivation.

분광측색계를 이용하여 녹차 탕색을 측정하기 위한 녹차 시료의 최적조건

고광섭(Kwang-Sup Ko),이진호(Jin-Ho Lee),유주(Ju Yoo),이민석(Min-Seuk Lee),이정대(Jeong-Dae Lee),현해남(Hae-Nam Hyun),김영걸(Young-Gul Kim) 한국차학회 2011 한국차학회지 Vol.17 No.1

In order to evaluate the quality of green tea extract color, the ratio of green to yellow (a/b ratio) in the extracted green tea was utilized. Using a color difference meter, the a/b ratio proportionally increased as the sample amount increased, which means that the sample amount did not influence the a/b ratio. Accordingly, based on an amount of 3 g, which was used in the sensory method, stabilization of the tea extract color varied until 20 minutes had passed. In addition, when the stem was removed, the a/b value was highest. Under these conditions, after the sample was measured 10 times, coefficient variance was below 3%, which means good recovery. This method had an accuracy ofR²=0.6894, compared to that of the sensory method. Therefore, this instrumental method is strongly suggested as one of the ways of objectively measuring tea extract color.

유기질비료(채종유박과 구아노)의 시비가 첫물차 생육 및 품질에 미치는 영향

고광섭(Kwang-Sup Ko),이진호(Jin-Ho Lee),유주(Ju Yoo),이민석(Min-Seuk Lee),이정대(Jeong-Dae Lee),김영걸(Young-Gul Kim) 한국차학회 2010 한국차학회지 Vol.16 No.3

This study was carried out to evaluate the effects of organic fertilizer on the growth and quality of the first crop of tea. Test plots were applied with a combination of organic fertilizers, spring fertilizer (sesame oilseed cake), and budding stage fertilizer (Guano) in February and April, and the results were compared with those of a non-treatment plot. Yield, number of new shoots, and weight of one bud were not significant amotg the treatments. However, the rate of banjhi shoot growth was clearly reduced as application time increased. Chlorophyll contents increased in April 12 days after the addition of budding stage fertilizer, which was 2 months after spring fertilizer was applied. In addition, usage of tea taste indicator compounds showed that total free amino acid and theanine contents linearly increased as application time increased, indicating that the combined application of budding stage fertilizer influenced the contents of chlorophyll and nitrogen compounds. Contribution of guano fertilizer resulted in increases in the contents of total free amino acids and theanine by 13.44 ± 4.01% and 11.81 ± 4.49%, respectively. Conclusively, this strongly suggests that Guano as budding stage fertilizer could be used as a tea taste indicator to increase the contents of total free amino acids and theanine by 10% or more.

가을整枝 時期가 品種別 첫물茶의 生育에 미치는 影響

이진호(Jin-Ho Lee),이민석(Min-Seuk Lee),이정대(Jung-Dae Lee),유주(Ju Yoo),고광섭(Kwang-Sup Ko),김영걸(Young-Gul Kim) 한국차학회 2007 한국차학회지 Vol.13 No.3

차나무에서 가을정지 시기가 다음해 첫물차의 생육과 품질에 미치는 영향을 구명하기 위하여 조생, 중생, 만생의 3품종에서 가을정지를 9/26, 10/6, 10/16, 10/26로 처리시기를 달리하여 생육특성과 품질을 평가하였다. 품종의 조만성에는 상관없이 모든 품종에서 가을정지 시기가 빠를수록 아장과 백아중의 증가가 빨리 진행되었다. 가을정지 시기가 빠를수록 첫물차 개엽수의 진행도 빨리 진행되어 성숙도가 높아졌으며 수량도 많아졌다. 반면에 품질면에서는 가을정지 시기가 빠를수록 품질과 정의 상관관계가 높은 전질소, 유리아미노산, 데아닌의 함량은 낮아지고 부의 상관관계가 있는 섬유소의 함량은 높아짐을 알 수 있었다. 또한 가을정지 시기를 조절함에 의해서 품종의 조만성을 극복할 수 있을 정도로 생육의 진행도를 변화시킬 수 있을 것으로 판단되었다. This study was conducted to determine the autumn skiffing time on growth and quality of first crop tea in three cultivars(Camellia Sinensis var. Sayamakaori, Yabukita, Kanayamidori). The autumn skiffings of four different times, such as 26 Sepember, 6 October, 16 October and 26 October, were conducted. According to the experiment, the earlier skiffing time was, the earlier increase pattern of bud length and bud weight in first crop tea that we could get in all tea cultivars. The result suggested that at the early skiffing time, the number of opened leaves and yield got higher. Contrarily, in a quality of first crop tea, the chemical constituents(total nitrogen, free amino acids, theanine) content that had positive correlation to green tea quality showed a lower response to earlier autumn skiffing time. But the chemical constituent(neutral detergent fiber) content that had negative correlation to green tea quality also showed a higher response. In conclusion, varying skiffing time is recognized to control growth, yield and quality of first crop tea as surpass earliness of tea cultivars.

차나무(Camellia sinensis)에서 剪枝처리의 强度와 時期가 생육 및 품질에 미치는 영향

이진호(Jin-HO Lee) · 이민석(Min-Seuk Lee) · 이정대(Jung-dae Lee) · 유주(Ju Yoo) · 김영걸(Young-Gul Kim) 한국차학회 2006 한국차학회지 Vol.12 No.2

Pruning is one of the most effective techniques in the tea cultural practice that controls the formation of trunks and branches. In order to find out the suitable intensity and time for pruning, we had tea plants pruned at two different times varying the pruning intensity : tea plants were first pruned at a height of 50cm, 60cm, and 70cm from the surface of the earth respectively on May 30th, 2004, which was 15 days later after the first tea crop, and the second pruning was done at a height of 50cm, 55cm, 60cm, and 65cm from the surface of the earth on July 11th, 2004, 15 days later after the second tea crop. According to the experiment, the more intensive pruning was, the longer bud length and the more opened leaves we could get regardless of the time. It also showed the result that as a pruning position was lowered, the sprouting rate got higher. In addition, the first tea crop showed a lower response to higher pruning intensity, while the yield at the unit area(20cm 20cm) increased except 50cm pruning after the second tea crop. Finally, both the whole and unit area yield turned out to be low when pruned below 50cm after the second tea crop. Therefore, it is considered as a noneffective pruning condition. In conclusion, varying pruning conditions is not recognized to affect on the quality of the first tea crop, because there is no meaningful correlation between chemical component content of tea leaves and different pruning conditions.