http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
권기원(Ki-Won Kwon),이해연(Hae-Yeoun Lee) 한국정보기술학회 2022 한국정보기술학회논문지 Vol.20 No.7
Although the demand for smart factory is increasing, existing factory systems consist of outdated mechanical equipments without networks and automation facilities. With the recent activation of IoT-based services, this limitations can be solved. This paper describes the development of a LoRa network-based smart IoT platform to solve the limitations of smart factory implmentation and communication in old factories. It describes the development of a multiple input/output IoT interface board for I/O with sensors and LoRa communication is explained. Also, the construction of a control server that can monitor and control sensors and analyze data is presented. Through data sending and receiving experiments on the implemented platform, it was confirmed that packets were transmitted without errors and various data could be collected and analyzed remotely to implement a smart factory.
임분내 광환경의 차이에 따른 주요 참나무 수종의 생장과 엽록소 함량 변화에 관한 연구
권기원(Ki-Won Kwon),최정호(Jeong-Ho Choi),송호경(Ho-Kyung Song),강병식(Byung-Sik Kang) 한국산림바이오에너지학회 2003 산림바이오에너지 Vol.22 No.3
참나무류 주요 수종을 대상으로 다양한 광선 조건에 식재된 실생묘의 활착 및 상대생장량과 광선에 대하여 민감하게 작용하는 엽록소 함량의 계절적인 변화를 조사하기 위하여 상수리나무 1-1묘, 1-0묘, 신갈나무 1-0묘, 졸참나무 1-0묘, 굴참나무 1-0묘를 상수리나무 임분내에 상층임분 밀도를 자연광의 81%, 34%, 21% 등 3가지로 조절하였다.<br/> 조사대상 수종의 묘목을 20m x 10m 크기의 시험구에 100본씩 식재하여 활착율, 상대생장량, 엽록소 함량을 비교하였다.<br/> 상수리나무 1-1묘가 평균 73%로 다른 수종에 비해 높은 활착율을 보였고, 상수리나무 1-0묘가 66%, 신갈나무와 졸참나무가 각각 56%, 45%였으며, 굴참나무는 41%로 이식후 활착율이 가장 낮게 나타났다. 또한 자연광의 81% 실험구에서 대부분의 주요 참나무류 수고, 근원경 생장이 가장 좋은 경향을 보여 주고 있었으며 자연광의 21% 실험구에서는 오히려 광도가 낮아지면서 생장이 상대적으로 저해되는 경향을 보여 주고 있다. 엽록소 함령(a, b, 총엽록소 함향)은 광도가 낮아지면서 엽록소 함량도 낮아지는 것을 알 수 있었다. 그러나 주요 참나무류 수종의 피음 효과에 대한 생장반응은 지속적으로 관찰해야 하며, 엽록소 함량과 생장에 밀접한 관련이 있는 생리적 특성에 대한 연구도 필요할 것으로 생각된다. This study was subjected to compare seasonal changes of survival rate, relative growth rate, and chlorophyll contents of major oak tree species including Quercus acctissima, Quercus mongolica, Quercus serrata, Quercus variabilis seedlings grown in Quercus acctissima forest under different light intensities. Three light intensities were 81% of sunlight, 34% of sunlight and 21% of sunlight. In each treatment, 100 tree seedlings were planted and survival rate, growth rate, and chlorophyll contents were measured. <br/> The highest survival rate was Quercus acctissima in 73% seedlings compared with those subjected to the other tree seedlings in 45~66%. Lowest survival rate was Quercus variabilis seedlings in 41%. Oaks tree species of the height, the root collar diameters of the relative growth were better in the seedlings grown in 81% light intensities of full sun. But growth rates decreased rapidly in the shade treatment of 21% light intensities of full sun. Lowest chlorophyll contents(chlorophyll a, b and total) were shown at 21% light intensities of full sun, lowest light intensity treatment in this study. This result is thought growth and chlorophyll contents associated with light intensity. Also, Physiological characteristics has to be investigated in near future because photosynthesis and chlorophyll contents were strongly related to tree growth with long periods.
수분 및 양료 (養料) 처리에 따른 참나무류와 물푸레나무의 생장 및 생리 반응
권기원(Ki Won Kwon),이정호(Jeoung Ho Lee) 한국산림과학회 1994 한국산림과학회지 Vol.83 No.2
Temporal changes in growth performances, chlorophyll contents, and tissue water relations for determining their physiological responses of five economic tree species subjected to chronic water and nutrition stresses were investigated with containerized seedlings grown in different soil moisture regimes and nutrition levels. Seedlings of Quercus acutissima, Q. variabilis, Q. mongolica, Q. serrata, and Fraxinus rhynchophylla were propagated in plastic pots(I.D. 16㎝×Depth 16㎝) for the experiments. The seedlings were subjected to two soil moisture regimes of dry and wet soils and two nutrition levels of fertilization with N+P+K and no fertilization through the growing season from May to September in a green house. For the purpose of analyzing their responses to the environmental stresses, seedling heights and root collar diameters, chlorophyll contents, and P-V curve parameters of the seedlings were measured in May, July, and September. The environmental stresses coming from moisture and nutrient deficits affected the growth performances of seedlings variously among species and among different growing periods, as well as between height and basal diameter growth of seedlings. The growth performances of Q. acutissima were influenced sensitively on the stresses, but those of Q. mongolica less influenced in comparison with other species. Chlorophyll contents were generally higher in Quercus spp. than F. rhynchophylla through the growing season. The chlorophyll contents changed by species and by treatment through the season within ranges of 0.14-1.96 ㎎/g dry wt. of chlorophyll a and within 0.16-1.79㎎/g dry wt. of chlorophyll b, respectively. But the contents seemed to be decreased gradually through the chronic environmental stresses and leaf senescence. The osmotic potential at full turgor(Ψπo) and turgor loss point(Ψπp) had temporarily declined up to 3 to bars from -7.0∼-12.4bars in May to -10.2∼-17.5bars in September and up to 5 to 6bars from -7.6∼-14.2 bars in May to -12.9∼-20.4bars in September, respectively, with some exceptions. The values of Ψπp were generally high in F. rhynchophylla in May and July, but high in Q. serrata in September. Relative water contents at turgor loss point(RWCp) were generally high in F. rhynchophylla, but the temporal changes of RWCp were quite and frequently different among species and among treatment.
크기 및 회전 불변 특징점을 이용한 파노라마 영상 합성 알고리즘
권기원,이해연,오득환,Kwon, Ki-Won,Lee, Hae-Yeoun,Oh, Duk-Hwan 한국정보처리학회 2010 정보처리학회논문지B Vol.17 No.5
본 논문은 동일한 대상물을 촬영한 영상을 합성하여 파노라마 영상을 생성하는 방법에 대하여 설명한다. 디지털 카메라의 보급으로 파노라마 영상에 대한 관심이 높아지면서 다양한 방법의 파노라마 영상의 제작 방법이 연구되고 있다. 본 논문에서는 크기 및 회전 불변 특징점을 활용하여 파노라마 영상을 합성하는 방법에 대해서 제안한다. 먼저, 입력 영상들에 대해서 특징점을 추출하고, RANSAC 알고리즘을 통해 추출된 특징점을 정합한다. 정합점을 이용하여 투영 변환식을 모델링하고, 모델링된 변환식을 통하여 영상을 정렬하여 파노라마 영상을 생성한다. 제안한 알고리즘은 SURF 특징점 추출 알고리즘을 적용하여 영상의 크기 및 회전 등의 기하학적 변형에 강인하며, 처리 속도도 향상하였다. 실험에서는 기존 Harris corner 검출기나 SIFT 알고리즘을 통해 검출한 특징과 제안한 알고리즘에서 사용된 SURF 알고리즘을 비교 분석 하였고, $640{\times}480$ 크기의 영상을 이용하여 제안한 알고리즘을 통해 파노라마 영상을 합성하였다. 그 결과 파노라마 영상의 합성에 소요되는 시간은 평균0.4초로 나타났고, 기존 알고리즘에 비하여 효율적인 것으로 나타났다. This paper addresses the way to compose paronamic images from images taken the same objects. With the spread of digital camera, the panoramic image has been studied to generate with its interest. In this paper, we propose a panoramic image generation method using scaling and rotation invariant features. First, feature points are extracted from input images and matched with a RANSAC algorithm. Then, after the perspective model is estimated, the input image is registered with this model. Since the SURF feature extraction algorithm is adapted, the proposed method is robust against geometric distortions such as scaling and rotation. Also, the improvement of computational cost is achieved. In the experiment, the SURF feature in the proposed method is compared with features from Harris corner detector or the SIFT algorithm. The proposed method is tested by generating panoramic images using $640{\times}480$ images. Results show that it takes 0.4 second in average for computation and is more efficient than other schemes.
일괄식 장력장치타입에서 장력분배바 타입별 장력변동특성 검토 및 직선형 장력분배바 설계
권삼영(Kwon Sam-Young),이기원(Lee Ki-won),천선기(Chun Sun-Ki),이희성(Lee Hi-Sung) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, the relation between the rotation which are usually caused by the creep of the contact wire, the bar geometry and the forces(wire tensions) for the triangle-shaped distribution bar and straight-shaped one in dependent tensioning device system is reviewed. According to the result, a rotation of distribution bar in triangle-shaped one modifies the distribution of the tensions between the three wires hooked in a distribution bar. On the contrary, a rotation on the straight-shaped one leads to no tension distribution change. Therefore, to use the straight-shaped distribution bar instead of triangle-shaped one is recommended. In addition, the design contents of the distribution bar which will be used in electrification of Gyeongbu line are described in this paper.