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Tiled Stereo Display System for Immersive Telemeeting
Kim, Ig-Jae,Ahn, Sang-Chul,Kim, Hyoung-Gon The Korean Infomation Display Society 2007 Journal of information display Vol.8 No.4
In this paper, we present an efficient tiled stereo display system for tangible meeting. For tangible meeting, it is important to provide immersive display with high resolution image to cover up the field of view and provide to the local user the same environment as that of remote site. To achieve these, a high resolution image needs to be transmitted for reconstruction of remote world, and it should be displayed using a tiled display. However, it is hard to transmit high resolution image in real time due to the limit of network bandwidth, and so we receive multiple images and reconstruct a remote world with received images in advance. Then, we update only a specific area where remote user exists by receiving low resolution image in realtime. We synthesize the transmitted image to the existing environmental map of remote world and display it as a stereo image. For this, we developed a new system which supports GPU based real time warping and blending, automatic feature extraction using machine vision technique.
골수강내 교합정을 이용한 경골 간부 골절의 치료에 있어서 Reaming type 과 Unreaming type의 비교
김수곤,김철현,김재혁,김익곤 대한골절학회 1995 대한골절학회지 Vol.8 No.3
The authors analyzed 41 cases of fresh diaphyseal fracture of tibia who were treated with intramedullary interlocking nail between Oct. 1991 to Oct. 1993. in Hae-Dong hospital and followed up for 12 months or more. Among 41 cases, 18 cases were treated with reamed nailing method, and the others with unreamed method. The authors compared the results of 2 type of nailing method and obtained the following results. 1. Most of the cases(63%) had injury in their third and forth decade. Male was 31 cases. 2. The most common cause of injury was traffic accident(61%). 3. The mean bony union time was 16.5 weeks in reamed case, and 15.6 weeks in unreamed case. 4. The patients were judged to have good or excellent result in 89% of reamed cases and 87% of unreamed cases according to functional result by Klemm and Borner13) The merits of unreamed intramedullary interlocking nail were relatively easier in procedure, short operation time, and less bleeding. So the authors concluded that unreamed intramedullary interlocking nail is useful method to treat the tibial diaphyseal fractures, especially in open fracture, elder patient and complicated patient
3D Lip-Synch Generation with Data-Faithful Machine Learning
Kim, Ig-Jae,Ko, Hyeong-Seok Blackwell Publishing Ltd 2007 Computer Graphics Forum Vol.26 No.3
<P>Abstract</P><P><I>This paper proposes a new technique for generating three-dimensional speech animation. The proposed technique takes advantage of both data-driven and machine learning approaches. It seeks to utilize the most relevant part of the captured utterances for the synthesis of input phoneme sequences. If highly relevant data are missing or lackingthen it utilizes less relevant (but more abundant) data and relies more heavily on machine learning for the lip-synch generation. This hybrid approach produces results that are more faithful to real data than conventional machine learning approacheswhile being better able to handle incompleteness or redundancy in the database than conventional data-driven approaches. Experimental resultsobtained by applying the proposed technique to the utterance of various words and phrasesshow that (1) the proposed technique generates lip-synchs of different qualities depending on the availability of the dataand (2) the new technique produces more realistic results than conventional machine learning approaches.</I></P>
고관절부 골절환자군과 정상군의 골 밀도와 골절 역치 비교
김철현,김종석,김재혁,김익곤 대한골절학회 1999 대한골절학회지 Vol.12 No.2
Osteoporosis represents reduced amount of bone mass per unit volume as compared with controls of the same age and sex. In this condition, bone mineral density decreases and the skeleton becomes more prone to fracture. The purpose of this study was to show how bone mineral densities of the femoral neck area decrease with aging, to in vestigate the relationship between the bone mineral densities of the control and fracture group, and to obtain fracture threshold values. This report observed BMD of femoral neck region in femoral neck and intertrochanteric fracture group was less than that of control group and the differences were significant. We measured and evaluated BMD of femoral neck region by DEXA in 234 normal volunteers(99 men and 135 women), in 105 patients with femoral neck fracture(41 men and 64 women) and in 103 patients with intertrochanteric fracture(40 men and 63 women) above 50 years-old. Following results were obtained: 1. The average BMD of femoral neck region in control group, femoral neck fracture group and intertrochanteric fracture group were 0.751±0.030 g/cm in male and 0.661±0.089g/cm in female, 0.660±0.031g/cm in male and 0.557±0.002g/cm in female and 0.661±0.008g/cm in male and 0.562±0.005g/cm in 2. The BMD of the control group and fracture group decreased with aging and were higher in men than in women and there were statistically significant difference(p$lt;0.001). 3. There were statistically significant difference between BMD of the control group and BMD of the hip fracture group(p$lt;0.005) but no significant differences between BMD of the femoral neck fracture group and intertrochanteric fracture group. 4. Fracture threshold of the hip fracture group were 0.815g/cm(male:0.832g/cm2, female:0.733g/cm2) according to 95 percentile.
김철현,김종석,김재혁,김익곤 대한골절학회 1998 대한골절학회지 Vol.11 No.2
Forty-six patients who had had forty-nine calcaneal fractures were managed with closed reduction and a cast, closed reduction and axial pin fixation, and open reduction and internal fixation. The results were reviewed retrospectively, between twelve months and twenty-six months after the treatment, with criteria usued in assesssment of result by Salama30) and with plain radiographs. The purpose of this study were to analyze the relationship between the prognostic factors and post-treatment results. The results of treatment and prognostic factors obtained from this study were as follows. 1. The negative prognostic factors that were associated with an unsatisfactory out come were an age of more than fifty years, a greater body weight, work involving strenuous labor, subtalar incongruity, a decreased fibulocalcaneal space, and a decreased B hler-angle ratio of the fractured to the normal side. 2. Patients who had had a tongue-type fracture had a better result than those who had had a central depression fracture, while those who had had a central depression fracture had a better outcome than those who had had a comminuted fracture. 3. The length of the Achilles-tendon fulcrum, which is directly related to the calcaneal length, was not related to the outcome.