• 한국항공우주학회지
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• 제42권1호
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• pp.20-28
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• 2014

본 논문에서는 비례항법 유도의 특성을 이용하여 수동 호밍 유도탄을 위해 탐색기의 lock-on 조건을 유지하면서 충돌각 제어를 할 수 있는 복합 유도법칙을 제안한다. 제안된 유도법칙은 두 가지 형태의 유도명령으로 구성되어 있다. 첫 번째 유도명령은 초기 유도단계에서 탐색기의 지향각(look angle)을 일정하게 유지키기 위한 것이고, 두 번째는 비례항법 유도명령으로서 특정 시선각 조건을 만족시킨 후 적용하여 원하는 충돌각으로 표적을 타격시키게 된다. 제안된 유도법칙은 유도탄의 탐색기 field-of-view(FOV)와 가속도 제한을 동시에 고려하고, 유도명령을 생성시키기 위해 표적 거리정보와 잔여비행시간(time-to-go) 정보가 필요하지 않기 때문에 수동 호밍 유도탄에 직접 적용할 수 있다. 다양한 비선형 시뮬레이션 결과를 통해서 제안된 유도법칙의 특성 및 성능 분석을 수행한다.

• 대한디지털의료영상학회논문지
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• 제12권1호
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• pp.43-50
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• 2010

The representative study of Patellofemoral Joint Merchant method can show the view for inspection of the sulcus angle, congruence angle and diagnose whether there are the vertical fractures and recognize the degree of dislocation and patella subluxation. However, anatomical correlation about the degree of knee joint curvature changes during position adjustment and distortion of the image reduces reproducibility. In order to resolve these problems, Merchant method needs to use assisting device which reduces the occurrence of repeat projection and effectively to increase unification of examination and the consistency of the image. However, there are disadvantages for patients who take other examinations. For example, they have to change the position for every examination and it might cause the patient's discomfort and increase of examination time. In this study, we newly devised commercial assisting device which improves the reproducibility of the images and reduces inconvenience of patients movement. Further research should be taken to obtain a image without patient's movement and to reduce the time of the examination than existing method.

• 로봇학회논문지
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• 제3권1호
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• pp.58-67
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• 2008

This study developed a novel augmented reality interface for minimally invasive surgery. The augmented reality technique can alleviate the sensory feedback problem inherent to laparoscopic surgery. An augmented reality system merges real laparoscope image and reconstructed 3D patient model based on diagnostic medical image such as CT, MRI data. By using reconstructed 3D patient model, AR interface could express structure of patient body that is invisible outside visual field of laparoscope. Therefore, an augmented reality system improved sight information of limited laparoscope. In our augmented reality system, the laparoscopic view is located at the center of a wide-angle concave screen and reconstructed 3D patient model is displayed outside the laparoscope. By using a joystick, the laparoscopic view and the reconstructed 3D patient model view are changed concurrently. With our augmented reality system, the surgeon can see the peritoneal cavity from a wide angle of view, without having to move the laparoscope. Since the concave screen serves immersive environments, the surgeon can feel as if she is in the patient body. For these reasons, a surgeon can recognize easily depth information about inner parts of patient and position information of surgical instruments without laparoscope motion. It is possible for surgeon to manipulate surgical instruments more exact and fast. Therefore immersive augmented reality interface for minimally invasive surgery will reduce bodily, environmental load of a surgeon and increase efficiency of MIS.

• 대한치과교정학회지
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• 제15권1호
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• pp.105-114
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• 1985

In order to obtain the basic data of the movements of the mandible for orthodontic treatment and gnathosurgery of cleft individuals, the ranges and shapes of the movements of the mandible were measured in frontal, sagittal, and horizontal view with Saphon Visi-Trainer CII, in 19 adult cleft lip and palate individuals. The subjects included 5 BCLP, 9 UCLP, and 5 CLA patients. The measurements were compared with the values of normal individuals reported by Kang 1. Frontal view. The mean values for maximal laterotrusion were almost the same as those previously reported for the normal individuals. Mandibular deviation in maximal opening was usually toward the right, while it was mainly toward the left in normal individuals. Typical shield was formed only in the CLA group. 2. Sagittal view; The mean value for maximal protrusion was not different from that of normal group and antero-posterior deviation showed a significant difference. The angle of maximal protrusion and horizontal plane was less than that of normal group. 3. Horizontal view; The mean values for maximal laterotrusion and protrusion were not different from those of the normal group. The angle of the laterotrusion and horizontal plane was larger in the left and smaller in the right.

• 전기학회논문지
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• 제63권4호
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• pp.570-574
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• 2014

This paper proposes a wireless digital endoscope with a ultra-wide-angle view. Two key components are implemented to demonstrate the feasibility of the proposed endoscope. First, a ultra-wide-angle lens module with the field of view of 144 degree and F-number of 2.2 is designed and manufactured. Second, a wireless module for a high-speed video transfer is implemented using a USB device server and wireless LAN router. The wireless module can directly transfer a streaming video to a computer with the resolution of 1920x1080, frame rate of 30 fps, and data rate of 53.3 Mbps without an internet connection. Since the wireless module supports two USB devices, two spots can be simultaneously observed using the proposed endoscope.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 춘계학술대회
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• pp.402-403
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• 2018

차량용 근거리레이다에서 사용하는 70GHz대역 고이득 배열안테나를 설계하고 제작하였다. 근거리 레이다에서는 분해능을 높이기 위해서 이득이 높아야 하며 FoV(Field of View)를 확보하기 위한 Angle Width를 가져야 한다. 제안된 안테나는 76~81GHz에서 동작하며 Angle width $60^{\circ}$, 안테나이득 15dB 이상을 만족하고 동작주파수내에서 입력반사계수 -10dB 이하의 성능을 갖는다. 안테나의 측정을 위하여 Wave guide WR-10을 사용하였고 측정결과 시뮬레이션과 유사한 결과를 얻었다.

• 한국정밀공학회지
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• 제30권4호
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• pp.414-420
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• 2013

We developed inkjet based measurement system for micro-droplet behavior on a substrate. By using the inkjet dispenser, a droplet, which is as small as few pico-liter in volume, can be jetted and the amount can be controlled. After jetting, the droplet image on the substrate is acquired from side view camera. Then, droplet profile is extracted to measure droplet volume, contact angle and evaporation characteristics. Also top view image of the droplet is acquired for better understanding of droplet shape. The previous contact angle measurement method has limitations since it mainly measures the ratio of height and contact diameter of droplet on a substrate. Unlike previous measurement system, our proposed method has advantages because various behavior of droplet on substrate can be effectively analyzed by extracting the droplet profile.

• 대한방사선기술학회지:방사선기술과학
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• 제22권2호
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• pp.27-32
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• 1999

Cochlear implant poses a contraindication to the magnetic resonance imaging(MRI) process, because MRI generates artifacts, inducing an electrical current and causing device magnetization. CT is relatively expensive and the metal electrodes scatter the image. Post-implantation radiological studies using anterior-posterior transorbital, submental-vertex and lateral views, the intracochlear electrodes are not well displayed. Therefore, the authors developed a special view, which we call the cochlear view. The patient is sitting in front of a vertical device. Then the midsagittal plane is adjusted to form an angle of $15^{\circ},\;30^{\circ}$, and $45^{\circ}$ with the film. The flexion of the neck is adjusted to make the infraorbitomeatal line(IOML) is parallel with the transverse axis of the film. The central ray is directed to exit from the skull at point which is 3.0 cm anterior and 2.0 cm superior to the EAM(external auditory meatus). Results have shown that single radiography of the cochlear view provides sufficient information to demonstrate the position of the electrodes array and the depth of insertion in cochlear. Radiography of the cochlear view in angle of $45^{\circ}$ is an excellent image. The cochlear view gives the greatest amount of medical information with the least radiation and lowest medical cost. It can be widely used in all cochlear implant clinics.

• 한국환경과학회지
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• 제12권9호
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• pp.921-934
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• 2003

The purpose of this study is to identify the characteristics and differences of borrowed landscape in traditional arbors and temples in Jeonbuk province. And this study is attempted to widespread the width of understanding the traditional landscape borrowing method for contributing in modem reception and creation of landscape architectural culture. For this, 30 traditional arbors and 30 traditional temples in Jeonbuk province were selected. The orientation of the place of view point, distance, vertical and horizontal angle were surveyed for identifying the structure of borrowed landscape. Furthermore main element, auxiliary element and a media of borrowed landscape were surveyed also. Two hypothesis were established for verifying the feasibility and real effectiveness of research results. First, the willingness of borrowed landscape shall be being in establishing traditional arbors and temples. Second, this willingness of borrowed landscape shall be accomplished in arbor space more positively than in temple space. The results of this study are as follows; 1. In temples, the surrounding landscape adapted in Buddhism principles are principally expressed, whereas in arbors, congregating landscape, variety landscape, background landscape for establishing good view point and enframed landscape are induced for making authoritative landscape as various borrowed landscape techniques. 2. The distance to borrowed landscape in temples is involved in far landscape region, whereas that in arbors is in middle and near. In comparative with temples, the arbors shows variety in distance to the borrowed landscape objects. 3. Down view borrowing is used generally in arbors, whereas upper view borrowing is used in temples at the view angle to the borrowed landscape objects. 4. Borrowed landscape objects are more considered factors than view scope in arbors. Main elements for borrowing landscape are very various arbors, but those are simple as mountains and peaks in temples. And natural elements are much more than artificial things in arbors as a media of borrowing landscape in comparative with temples.

• 한국ITS학회 논문지
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• 제22권1호
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• pp.115-125
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• 2023

본 논문은 교통상태 감시 등 교통관제를 위해 설정한 CCTV 카메라의 화각 상태에서 교통량, 속도 등 교통정보 수집을 동시에 수행할 수 있는 CCTV 카메라 자세보정 알고리즘 개발에 관한 것이다. 개발한 자율자세보정 알고리즘은 차량인식 및 추적기법을 이용하여 도로를 식별하고, 운영자의 교통감시 및 교통정보 수집을 위한 화각을 결정한다. 제안 알고리즘의 성능검증은 현장에 설치한 CCTV를 이용하였으며, 교통감시 및 교통정보 수집을 위해 각각 설정한 화각에 대해 자율자세보정 알고리즘이 자동 산출한 화각의 결과와 비교하였다. 분석결과 운영자 감시를 위한 화각은 상호 96%의 일치성을 보였다. 교통정보의 경우는 교통량 및 속도의 정확도가 각각 96%, 95%로 산출됐으며 수동 설정한 화각과 비교할 때 약 2%의 오차가 발생하는 것으로 나타났다. 결과적으로 제안 알고리즘을 통해 관제용 CCTV를 이용하여 교통정보 수집 및 교통상황 감시를 동시에 수행할 수 있음을 확인하였다.