• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.1
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• pp.20-28
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• 2014

In this paper, based on the characteristics of proportional navigation, a composite guidance law is proposed for impact angle control of passive homing missiles maintaining the lock-on condition of the seeker. The proposed law is composed of two guidance commands: the first command is to keep the look angle constant after converging to the specific look angle of the seeker, and the second is to impact the target with terminal angle constraint and is implemented after satisfying the specific line of sight(LOS) angle. Because the proposed law considers the seeker's filed-of-view(FOV) and acceleration limits simultaneously and requires neither time-to-go estimation nor relative range information, it can be easily applied to passive homing missiles. The performance and characteristics of the proposed law are investigated through nonlinear simulations with various engagement conditions.

• Korean Journal of Digital Imaging in Medicine
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• v.12 no.1
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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.

• The Journal of Korea Robotics Society
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• v.3 no.1
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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.

• The korean journal of orthodontics
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• v.15 no.1
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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.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.63 no.4
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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.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.05a
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• pp.402-403
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• 2018

70GHz-band high gain array antenna is developed for automotive short range radar sensor. In Short-rangeradar, the gain must be high in order to increase the resolution, and the angle width must be set to secure the field of view(Fov). The proposed antenna operates at 76~81GHz and satisfies angle width $60^{\circ}$, antenna gain 15dB and the input reflection coefficient of less than -10dB within the operating frequency. Wave guide WR-10 was used to measure the antenna and results similar to the simulation results were obtained.

• Journal of the Korean Society for Precision Engineering
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• v.30 no.4
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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.

• Journal of radiological science and technology
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• v.22 no.2
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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.

• Journal of Environmental Science International
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• v.12 no.9
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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.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.22 no.1
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• pp.115-125
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• 2023

This paper relates to the development of CCTV camera posture calibration algorithm that can simultaneously collect traffic information such as traffic volume and speed in the state of view of the CCTV camera set for traffic monitoring. The developed autonomous posture calibration algorithm uses vehicle recognition and tracking techniques to identify the road, and automatically determines the angle of view for the operator's traffic surveillance and traffic information collection. To verify the performance of the proposed algorithm, a CCTV installed on site was used, and the results of the angle of view automatically calculated by the autonomous posture calibration algorithm for the angle of view set for traffic surveillance and traffic information collection were compared.