• The KIPS Transactions:PartA
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• v.10A no.2
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• pp.165-172
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• 2003

In this paper, we constructed horizontal and vertical virtual spaces using the projection table and the projection wall. We then implemented a system that stereoscopically visualizes three-dimensional (3D) buildings in the virtual environments in accordance with the user's viewing point. The projection table, a kind of horizontal display equipment, is effectively used in reproducing operations on a table or desk as well as in areas that require bird-eye views because its viewing frustum allows to view things from above. On the other hand, the large projection wall, a kind of vertical display equipment, is effectively used in navigating virtual spaces because its viewing frustum allows to take a front view. In this paper, we provided quick interaction between the user and virtual objects by representing major objects as detail 3D models and a background as images. We also augmented the reality by properly integrating models and images with user's locations and viewpoint in different virtual environments.

• Journal of Korean Medical classics
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• v.21 no.1
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• pp.13-26
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• 2008

Pediatrics in Geumwon(金元) age had fanned peculiar children's etiology, Byeonggihak(病機學) and Byeonjeungnon(辦證論) curative system grounded on medical theory in Geumwonsadaega(金元四大家). Yuwanso(劉完素), who was front-running man in that age, used so many times 'Yanggyeoksan(凉隔散)' or 'Bangpungtongseongsan(防風通聖散)' which have Hanryang(寒凉) disposition for curing children's disease in view of pathology in Yeoldahanso(熱多寒少), which is his special academic thought, after then Judangye(朱丹溪) succeed Yuwanso(劉完素)'s this view of pathology, Yang-eumjahyeol(養陰滋血) developed the one and made it a standing rule to cure children. Also Idongwon(李東垣) grasped that the main cause of disease is starvation because of war. As a result of it, he insisted on theory, internal cause's outbreak of person's illness, Naesangbiwi(內傷脾胃), Baekbyeong-yusaeng(百病由牛). In this view of this principle, he assorted and used following medicine 'Seungma(升麻), Siho(柴胡), Hwanggi' as 'Seungbalyanggi(升發陽氣)' method to cure children, and concentrated on children's spleen and stomach cure with this way. Jangjongjeong(張從政) applied 'Purgation therapy[攻下法]', Hantoha(汗吐下) centered on the theory of exogenous factors[外因說] , which explains that children's disease is Sagichimseup(邪氣侵襲), too. Like this, in Geumwon(金元) age, they had studied very seriously about main cause of children' s disease in two part, an internal cause and an external cause. Also, in pathological part they had approached academically 'Hwayeolchibyeong(火熱致病)' and 'Gigiseunggangsiljo(氣機乘降失調)' from diverse angles.

• Journal of Broadcast Engineering
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• v.28 no.1
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• pp.79-89
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• 2023

A multi-view display is regarded as the most practical technology to provide a three-dimensional effect to a viewer because it can provide an appropriate viewpoint according to the observer's position. But, most multi-view displays with flat shapes have a disadvantage in that a viewer watches 3D images only within a limited front viewing angle. In this paper, we proposed a spherical display using a ball lens with spherical symmetry that provides perfect parallax by extending the viewing zone to 360 degrees. In the proposed system, each projection lens is designed to be packaged into a small modular array, and the module array is arranged in a spherical shape around a ball lens to provide vertical and horizontal parallax. Through the applied optical module, the image is formed in the center of the ball lens, and 3D contents are clearly imaged with the size of about 0.65 times the diameter of the ball lens when the viewer watches them within the viewing window. Therefore, the feasibility of a 360-degree full parallax display that overcomes the spherical aberration of a ball lens and provides a wide field of view is confirmed experimentally.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.8
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• pp.332-337
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• 2017

This study investigates the site and architectural space of Byung-Su Jo's traditional house on Yongyu Island in Incheon. The house is located on a peaceful, warm site that is well protected by surrounding mountains, such as Hyunmubong to the rear, Jwacheongyong to the left, Wubackho to the right, and Ansan in front. The house was designed with an open layout with a sarangchae and anchae. There is a spring on the left side of the sarangchae, and a stream auspiciously flows from the west to the east in front of the sarangmadang. The house generally faces south, but to avoid pressure by the height of Ansan in the south direction, it is slightly turned to the east. There is a wide, rectangular pond that covers the pungsu weak point of the empty open view between the right and left mountains. The sarangchae space is composed of front 6 Gan and side 3 Gan. The anchae space is also composed of front 6 Gan and side 3 Gan,and it has a typical L-shaped anchae layout for the middle region of Korea. There is no shrine in the backyard, where yongmag is descending from hyunmubong, and a jangdokdae is installed to the west direction of the anbang due to narrow and slope backyard space.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.7
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• pp.913-921
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• 1993

Texture mapping is mostly used as an image synthesis method in the model-based coding system. An image synthesis using this method uses only the texture information of a front face-view. Therefore, when the model is rotated, texture mapping may produce an awkward image in point of shading. In this paper. a new texture mapping method considering shading effect is studied, and also the ear's wireframe and changes of hair are suplemented for the relation. The experimental results show that the proposed method yields the synthesized images with reasonably natural quality.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10b
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• pp.616-618
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• 2004

The Simple Virtual Environment (SVE) library is the application programming interface fur creating the virtual environment easily. Even though it has a lot of efficient features, applying transformation to absolutely positioned objects is difficult. In this paper, we designed a simple method with which it is possible to rotate the absolutely positioned object freely. To test the method, we designed a simple virtual environment. The environment is designed with people, street and building objects. To reduce time consumption of displaying high-detailed people models, we only used texture-based objects. The person objects are modeled as quadric-shape and textured with front-view images of people. To make more realistic environment, objects always change its orientation themselves following to the user location. The result and the testing environment will be demonstrated.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.812-817
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• 2006

This paper presents an image-space algorithm to real-time collision detection, which is run completely by GPU. For a single object or for multiple objects with no collision, the front and back faces appear alternately along the view direction. However, such alternation is violated when objects collide. Based on these observations, the algorithm has been devised, and the implementation utilizes the state-of-the-art functionalities of GPU such as framebuffer objects(FBO), vertex buffer object(VBO) and occlusion query. The experimental results show the feasibility of GPU-intensive collision detection and its performance gain in real-time applications such as 3D games.

• Journal of Institute of Control, Robotics and Systems
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• v.5 no.4
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• pp.437-445
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• 1999

Most autonomous mobile robots view only things in front of then, and as a result, they may collide with objects moving from the side or behind. To overcome this problem, an active omni-directional range sensor system has been built that can obtain an omni-directional depth map through the use of a laser conic plane and a conic mirror. In the navigation of the mobile robot, the proposed sensor system produces a laser conic plane by rotating the laser point source at high speed: this creates a two-dimensional depth map, in real time, once an image is captured. The results obtained from experiment show that the proposed sensor system is very efficient, and can be utilized for navigation of mobile robot in an unknown environment.

• Journal of the korean academy of Pediatric Dentistry
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• v.21 no.2
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• pp.504-509
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• 1994

Achondroplasia is characterized by undergrowth of long bones and cartilages and by low height. The name of this disease had been called classical chondrodystrophy, dyschondroplasia, chondrodystrophy and micromelia before Parrot reported the term of this disease as Achondroplasia. We are reporting in this paper on an 3-year and 4-month-old boy with achondroplasia. The dental findings are as follows: 1. Open bite and relatively mandibular prognathism were observed in the front teeth. 2. The size, number, shape, structure of the teeth were usual and the tongue was a little bigger than the normal. 3. The metacarpal bones were short and broadening. Mesial, distal border of the prox. phalanges were irregular and also trabecular pattern was abnormal in the hand-wrist P-A view. 4. According to lat. cephalometric analysis, the cranial basis was underdeveloped.

• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.22-26
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• 2007

In the fibre to the home (FTTH) era, it is expected that broadband network provisioning will require thousands of optical fibres to be accommodated in a central office for optical access networks. An optical fibre line testing system could be used to reduce maintenance costs and improve service availability depending on the PON's element manager capabilities and the maintenance procedures adopted by the network supplier. When monitoring optical fibres transmitting communication lights, a wavelength of 1625 nm is used for maintenance testing. The splitter installed optical filters allow the communication light to pass but that cut off the test light in the front of optical line terminals (OLTs) and optical network terminals (ONTs). In the economic point of view, We design new planer lightwave circuit splitter embedded filtter and study it optical property.