Daum Map API를 이용한 위성영상의 기하보정 정확도 평가

이성근,이호진,김태근,조기성,Lee, Seong-Geun,Lee, Ho-Jin,Kim, Tae-Geun,Cho, Gi-Sung 한국국토정보공사 공간정보연구원 2016 지적과 국토정보 Vol.46 No.2

위성영상의 정밀한 기하보정을 위해서는 지상기준점이 필요하며, GPS 측량은 양질의 지상기준점 좌표 취득을 위해 필수적이다. 하지만 GPS 측량을 하는 과정에서 많은 시간과 노력이 필요하기 때문에 이를 대체할 다른 대안을 연구할 필요가 있다. 이에, 본 연구에서는 지상기준점의 좌표를 취득하기 위한 기존의 GPS 측량을 웹 사이트 지도에서 제공하는 좌표로 대체하는 가능성에 대해 연구하였다. 이를 위해 Daum Map API를 통해 취득한 지상기준점의 좌표들 간의 오차량을 확인하였으며, 위성영상의 기하보정에 사용되는 3가지 좌표 변환식의 정확도를 비교하였다. 또한 가장 정확도가 높게 나온 변환식을 이용하여 GPS 측량을 통해 취득한 지상기준점의 좌표와 Daum Map API를 통해 취득한 지상기준점의 좌표를 이용하여 위성영상을 기하보정하고 그 정확도를 비교하여 그 효용성을 평가하고자 하였다. 그 결과, 3가지 좌표 변환식 중 polynomial 3차 변환식이 가장 높은 정확도를 나타내었으며, Landsat-8과 같은 중해상도 위성영상을 사용하는 경우에는 Daum Map API를 통해 지상기준 점의 좌표를 취득하고 이를 영상의 기하보정에 사용할 수 있음을 알 수 있었다. Ground control points are needed for precision geometric correction of satellite images, and the coordinates of a high-quality ground control point can be obtained from the GPS measurement. However, considering the GPS measurement requires an excessive amount o f t ime a nd e fforts, there is a need for coming up with an alternative solution to replace it. Therefore, we examined the possibility of replacing the existing GPS measurement with coordinates available at online maps to acquire the coordinates of ground control points. To this end, we examined error amounts between the coordinates of ground control points obtained through Daum Map API, and them compared the accuracies between three types of coordinate transformation equations which were used for geometric correction of satellite images. In addition, we used the coordinate transformation equation with the highest accuracy, the coordinates of ground control point obtained through the GPS measurement and those acquired through D aum M ap A PI, and conducted geometric correction on them to compare their accuracy and evaluate their effectiveness. According to the results, the 3rd order polynomial transformation equation showed the highest accuracy among three types of coordinates transformation equations. In the case of using mid-resolution satellite images such as those taken by Landsat-8, it seems that it is possible to use geometrically corrected images that have been obtained after acquiring the coordinates of ground control points through Daum Map API.

멀티캐스트 라우팅을 위한 Ant Colony System 설계에 대한 연구

이성근,한치근,Lee, Sung-Geun,Han, Chi-Geun 한국정보처리학회 2003 정보처리학회논문지 A Vol.10 No.4

조합 최적화 문제를 풀기 위한 개미 알고리즘(Ant Algorithm)은 실제 개미 집단의 행동을 모방하여 만들어진 것이다. Ant Colony System(ACS)은 여러 유형의 개미 알고리즘 중 비교적 최근에 소개된 것이다. ACS의 설계를 위해 순회 외판원 문제(Traveling Salesman Problem, TSP)를 사용하여 실험을 수행하였다. ACS를 다양한 조합 최적화 문제에 적용할 때 순회 외판원 문제에 사용된 ACS의 파라미터와 전략을 사용하고 있다. 본 논문에서는 조합 최적화 문제들 중 하나인 멀티캐스팅 라우팅 문제를 해결하기 위해 ACS를 이용하였다. 멀티캐스트 라우팅은 데이터를 하나의 송신자에서 여러 수신자들로 보내기 때문에 모든 노드를 포함하는 순회 외판원 문제와는 속성이 다르고, 송신자에서 각 수신자에 하나의 최단경로를 설정하는 문제와도 다른 속성을 지니고 있다. 본 논문에서는 멀티캐스트 라우팅에 ACS를 적용하기 위해 알고리즘의 동작을 수정하고, 수정한 ACS의 성능을 향상시키기 위한 최적의 전략과 파라미터를 설계한다. Ant Algorithm is used to find the solution of Combinatorial Optimization Problems. Real ants are capable of finding the shortest path from a food source to their nest without using visual informations. This behavior of real ants has inspired ant algorithm. There are various versions of Ant Algorithm. Ant Colony System (ACS) is introduced lately. ACS is applied to the Traveling Salesman Problem (TSP) for verifying the availability of ACS and evaluating the performance of ACS. ACS find a good solution for TSP When ACS is applied to different Combinatorial Optimization Problems, ACS uses the same parameters and strategies that were used for TSP. In this paper, ACS is applied to the Multicast Routing Problem. This Problem is to find the paths from a source to all destination nodes. This definition differs from that of TSP and differs from finding paths which are the shortest paths from source node to each destination nodes. We introduce parameters and strategies of ACS for Multicasting Routing Problem.

LCD TV BOTTOM CHASSIS 스프링백 해석

이성근,정진오,김승규,정완진,Lee, Sung-Geun,Jung, Jin-Oh,Kim, Seung-Kyu,Chung, Wan-Jin 한국금형공학회 2012 한국금형공학회지 Vol.6 No.1

In the manufacturing of a LCD TV bottom chassis, the distortion after forming should be suppressed below pre-defined amount to avoid contact with electric components. Finite element analysis procedure of forming and springback of a LCD TV bottom chassis is developed to investigate the distortion behaviour. It is shown that after the first forming large distortion occur due to uneven metal flow induced by various embossings. In the second forming, distortion is decreased by introducing bead that absorbs the excessive metal flow. It is proved that analysis method could describe these behaviour effectively. The developed analysis method can be used to find the proper location and shape of bead more quickly and effectively.

구강암 적출후 경부 도상 피판을 이용한 구강내 결손부의 재건 -3 치험례-

이성근,임종수,김경현,전소연,조영성,신상훈,조영철,성일용,김욱규,김종렬,정인교,양동규,LEE, Seong-Geun,LIM, Jong-Soo,KIM, Kyung-Hyun,JEON, So-Yeun,CHO, Young-Sung,SHIN, Sang-Hun,CHO, Young-Cheol,SUNG, Iel-Yong,KIM, Uk-Kyu,KIM, Jong-Ryoul,C 대한악안면성형재건외과학회 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.3

이상에서 저자 등은 $T_{1-3}$의 편평상피 세포암의 3증례에서 적출 후 연조직 결손부의 재건을 위해 Tashiro 등에 의해 변형된 Farr등의 경부 도상 피판을 이용하여 술후 특이한 합병증 없이 성공적인 결과를 얻을 수 있었다. 피판 작도시 부피의 한계와 경부 임파절의 전이나 혹은 예방적으로 경부에 3 Gy 이상의 방사선을 투여 받은 환자에서의 사용의 제한점에도 불구하고, 경부도상 피판은 결손 부위에 따른 피판의 다양한 변형이 가능하며, 적출과 동시에 빠르고 간단하게 효과적으로 결손부를 재건할 수 있으며, 공여부에 대한 피부이식이 필요하지 않고, 부가적으로 수술 시간과 입원 기간의 단축을 초래해 환자들의 삶의 질을 높일 수 있다고 사료된다. Many myocutaneous flaps have been used for the reconstruction of intraoral defects caused by the excision of oral cancer. Among these myocutaneous flaps, cervical island flap has been introduced by Farr et al. Although different in detail, this flap was designed as the platysma myocutaneous flap by Futrell et al in the supraclavicular site. Since many authors applied this flap to cover intraoral defect, they discussed deeply the blood supply of this flap. To improve further flap survival, it was modified by Tashiro et al. This flap makes its vascularity highly reliable. The amount of tissue needed for reconstruction can be accurately planned. The surgical and reconstruction procedure can be performed simply, rapidly, and effectively. Oral functions including deglutition, speech, and denture fitting are not compromised. With it's minimal deformity, new donor fields is not necessory. Of course, we keep in mind that this flap has limitations in patients where much bulk of tissue defects is needed and more than 3000 rad radiation due to the metastasis of neck lymph node is exposed. In three patients with intraoral squamous cell carcinoma($T_{1-3}N_0M_0$), we performed induction chemotherapy with FP regimen including pepleomycin. Thereafter, we ablated oral cancer and peformed reconstruction of intraoral defects with cervical island flap designed by Tashiro et al. Due to these significant benefits and minimal limitations, we have found that this flap is adequate for reconstruction of most intraoral defects following cancer ablation.

역설계 기반의 오프로드 특수차량용 액슬 드라이브 모듈 개발과정에 관한 연구

이성근(Sung-Geun Lee) 한국산업기술융합학회(구. 산업기술교육훈련학회) 2021 산업기술연구논문지 (JITR) Vol.26 No.3

Axle drive modules for off-road heavy-duty special vehicles are produced only by a few specialized manufacturers. In this study, reverse engineering is applied to develop the axle drive modules for on- or off-road heavy-duty special vehicles. The prototype axle drive module was developed using CAD/CAE tools with reference to similar existing specifications and evaluation standards. The development process applied in this study is expected to be useful for developing power trains and various axles for off-road heavy-duty special vehicles.

야지특수차량용 인터액슬 드라이브 유닛 개발

이성근(Sung-Geun Lee),박정현(Jeong-Hyeon Park),편영식(Young-Sik Pyoun),박병수(Byeong-Soo Park),조길수(Gil-Su Cho) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

Inter-axle drive for off-road heavy duty special vehicles are usually produced by only a few specialized companies. The special techniques, such as designing, producing, testing techniques has been unveiled. The test of durability with the vehicle in which is installed a prototype taking several years is required for setting the designing parameters. In the research, the designing specification and the testing methods are found out from the bench marking of the inter-axle drive unit for independent suspension type off-road heavy duty special vehicles. Also the prototype is developed from designing and testing the design with the CAD and CAE tools. As a result, the process and testing methods studied in this research are useful in the development of power train.

메탄 수증기 개질에 대한 열전달 시뮬레이션 연구

이성근 ( Sung Geun Lee ),임한권 ( Han Kwon Lim ) 대구가톨릭대학교 자연과학연구소 2015 자연과학연구논문집 Vol.13 No.1

The methane steam reforming is widely used to get synthesis gas such as mixture of hydrogen and carbon monoxide. It is carried out in high temperature with catalyst. A numerous study has been worked out both numerically and experimentally for different catalysts and reaction kinetics. In the present study the computer simulation has been studied for the methane steam reforming. While most of the computer based study has assumed isothermal condition throughout the reactor, the investigation here does not need such an assumption. The reactor for the simulation is designed based on the assumption that the size and the material of the reactor have been experimentally practiced in the laboratory. The applied reaction kinetics is that of Aker and Camp. The reformer is heated by four heating tubes inside the reformer. We investigate the temperature profile under the change of the positions of the heating tubes.

선박 비상조명용 디지털 전원장치 개발

이성근(Sung-Geun Lee) 한국항해항만학회 2004 한국항해항만학회지 Vol.28 No.8

본 논문은 선박비상조명용 디지털 전원장치의 개발에 관해 연구하였으며, 비상조명용 전원장치는 비상급전시스템, 반 브리지 인버터, 형광램프 기동회로 및 마이크로프로세서 제어시스템 등으로 구성되어 있다. 실험을 통하여 기존의 아날로그형 비상급전시스템에 비해 신속하고 안정된 전력이 공급되고 있음을 확인하고, 인버터의 펄스주파수 가변에 의한 조명제어가 잘 이루어지고 있음을 확인한다. This paper describes an development of digital power supply for ship’s emergency lighting system(SELS). Proposed system is composed of emergency power supply system(EPSS), half bridge(HB) inverter, fluorescent lamp(FL) starting circuit and microprocessor control system. Experimental works using proposed system confirm that speedy and stable power to be supplied when main power source cut-off, compared with conventional analog type, and control input power up to 35.0[%] by adjusting pulse frequency of the HB inverter.

무전극 램프(Electrodeless Lamp) 구동용 전원장치의 전력제어 특성에 관한 연구

이성근(Sung-Geun Lee),전수균(Su-Kyun Jeon),장민규(Min-Kyu Jang),김동석(Dong-Sok Kim),김윤식(Yoon-Sik Kim) 대한전기학회 2003 대한전기학회 학술대회 논문집 Vol.2003 No.10

인터넷 기반 가상공장 운영 모델

이성근(Sung-Keun Lee),공상훈(Sang-Hoon Kong),노상도(Sang-Do Noh),이교일(Kyo-Il Lee),한영근(Young-Geun Han) 대한산업공학회 1998 대한산업공학회 추계학술대회논문집 Vol.1998 No.10