• Title/Summary/Keyword: 표현시점

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Accelerating GPU-based Volume Ray-casting Using Brick Vertex (브릭 정점을 이용한 GPU 기반 볼륨 광선투사법 가속화)

  • Chae, Su-Pyeong;Shin, Byeong-Seok
    • Journal of the Korea Computer Graphics Society
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    • v.17 no.3
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    • pp.1-7
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    • 2011
  • Recently, various researches have been proposed to accelerate GPU-based volume ray-casting. However, those researches may cause several problems such as bottleneck of data transmission between CPU and GPU, requirement of additional video memory for hierarchical structure and increase of processing time whenever opacity transfer function changes. In this paper, we propose an efficient GPU-based empty space skipping technique to solve these problems. We store maximum density in a brick of volume dataset on a vertex element. Then we delete vertices regarded as transparent one by opacity transfer function in geometry shader. Remaining vertices are used to generate bounding boxes of non-transparent area that helps the ray to traverse efficiently. Although these vertices are independent on viewing condition they need to be reproduced when opacity transfer function changes. Our technique provides fast generation of opaque vertices for interactive processing since the generation stage of the opaque vertices is running in GPU pipeline. The rendering results of our algorithm are identical to the that of general GPU ray-casting, but the performance can be up to more than 10 times faster.

Double Threshold Method for EMG-based Human-Computer Interface (근전도 기반 휴먼-컴퓨터 인터페이스를 위한 이중 문턱치 기법)

  • Lee Myungjoon;Moon Inhyuk;Mun Museong
    • Journal of Biomedical Engineering Research
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    • v.25 no.6
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    • pp.471-478
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    • 2004
  • Electromyogram (EMC) signal generated by voluntary contraction of muscles is often used in a rehabilitation devices such as an upper limb prosthesis because of its distinct output characteristics compared to other bio-signals. This paper proposes an EMG-based human-computer interface (HCI) for the control of the above-elbow prosthesis or the wheelchair. To control such rehabilitation devices, user generates four commands by combining voluntary contraction of two different muscles such as levator scapulae muscles and flexor-extensor carpi ulnaris muscles. The muscle contraction is detected by comparing the mean absolute value of the EMG signal with a preset threshold value. However. since the time difference in muscle firing can occur when the patient tries simultaneous co-contraction of two muscles, it is difficult to determine whether the patient's intention is co-contraction. Hence, the use of the comparison method using a single threshold value is not feasible for recognizing such co-contraction motion. Here, we propose a novel method using double threshold values composed of a primary threshold and an auxiliary threshold. Using the double threshold method, the co-contraction state is easily detected, and diverse interface commands can be used for the EMG-based HCI. The experimental results with real-time EMG processing showed that the double threshold method is feasible for the EMG-based HCI to control the myoelectric prosthetic hand and the powered wheelchair.

Effects of the synectics conception on the illustration education (시넥틱스(synectics)적 발상이 일러스트레이션 교육에 미치는 영향)

  • Moon, Cheol
    • Archives of design research
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    • no.16
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    • pp.213-223
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    • 1996
  • Illustration has been used as a means of human communication since the primitive age. And now it has become a way to express impliedly either the fragmentary or the psychological side of our life. Like it has been said in peter knock's Illustration magazine, an artist said "it was the best article ever read." Illustrator's task is to abstract and practically describe not our daily life, but every moment of the perception an object, whether it is define or indefine. It can inspire stronger perception than any other elegant language. Addition to that the practical use of illustration is increasing ever day. The target has now become various such as man, nature, art, science and so on. Therefore, at this point what illustration requires is creation, new and striking idea. It is because in order to get in to the general's living in the complicate and various society, it must show unique images and appearance. Therefore, now the illustration should induce the work which is based on synetics thoughts, not simple improving skill. Now we must restrain futional and diagrammatic illustration education and be able to thik of free and abundant characteristics. It will eventually help students to feel the value of human life and free themselves from the reality of present education which is getting machinized and instrumentalized.entalized.

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Modern Vision in the 18~19th Century Garden Arts - The Picturesque Aesthetics and Humphry Repton's Visual Representation - (18~19세기 정원 예술에서 현대적 시각성의 등장과 반영 - 픽처레스크 미학과 험프리 렙턴의 시각 매체를 중심으로 -)

  • Lee, Myeong-Jun;Pae, Jeong-Hann
    • Journal of the Korean Institute of Landscape Architecture
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    • v.43 no.2
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    • pp.30-39
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    • 2015
  • The English Landscape garden and picturesque aesthetics, which was in fashion during the 18th to early 19th century in England, has been accused of making people see the actual garden in terms of a static landscape painting without a synesthetic engagement in nature. As new optic devices such as diorama, panorama, photography, and cinematography were invented, ways of seeing nature transitioned from a perspective vision to a panoramic, that is, modern one. This study intends to uncover signs of this kind of modern vision in the picturesque aesthetics and visual representation of landscape gardener Humphry Repton. German garden theorist Christian Cay Lorenz Hirschfeld contended that the English landscape garden was a new style of designing landscape that followed the principle of the serpentine line, which produced movement in sightlines; thus, he considered garden art as a superior art form among all other genres. The signs of visual motion appear in Repton's sketches of "Red Books". Firstly, he designed systemic routes in his clients' properties by considering different types of movements between walks and drives. Secondly, he often used the visual effects of panoramic views for his sketches in order to allow his clients to experience the human visual field. Lastly, he constructed sequences of sketches in order to provide his clients with an illusion of movement; in other words, Repton's sketches functioned as potential visual media to produce the duration of time in a visual experience. Thus, the garden aesthetics of the time reflected the contemporary visual culture, that is to say, a panoramic vision pertaining to visual motion.

Analysis and Recognition of Behavioral Response of Selected Insects in Toxic Chemicals for Water Quality Monitoring (수질 모니터링을 위한 유해 물질 유입에 따른 생물체의 행동 반응 분석 및 인식)

  • Kim, Cheol-Ki;Cha, Eui-Young
    • The KIPS Transactions:PartB
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    • v.9B no.5
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    • pp.663-672
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    • 2002
  • In this paper, Using an automatic tracking system, behavior of an aquatic insect, Chironomus sp. (Chironomidae), was observed in semi-natural conditions in response to sub-lethal treament of a carbamate insecticide, carbofuran. The fourth instar larvae were placed in an observation cage $(6cm\times{7cm}\times{2.5cm)}$ at temperature of $18^\circ{C}$ and the light condition of 10 time (light) : 14 time (dark). The tracking system was devised to detect the instant, partial movement of the insect body. Individual movement was traced after the treatment of carbofuran (0.1ppm) for four days 2days : before treatment, 2 days : after treatment). Along with the other irregular behaviors, "ventilation activity", appearing as a shape of "compressed zig-zag", was more frequently observed after the treatment of the insecticide. The activity of the test individuals was also generally depressed after the chemical treatment. In order to detect behavioral changes of the treated specimens, wavelet analysis was implemented to characterize different movement patterns. The extracted parameters based on Discrete Wavelet Transforms (DWT) were subsequently provided to artificial neural networks to be trained to represent different patterns of the movement tracks before and after treatments of the insecticide. This combined model of wavelets and artificial neural networks was able to point out the occurrence of characteristic movement patterns, and could be an alternative tool for automatically detecting presences of toxic chemicals for water quality monitoring. quality monitoring.

Visual Extensions on Brand Using Secondary Images of Animation - Focused on Disney's The Jungle Book and Alice in Wonderland (애니메이션의 2차 이미지를 활용한 브랜드의 시각적 확장 - 디즈니 정글북과 이상한 나라의 엘리스 사례를 중심으로)

  • Kim, Kyong-Ju
    • The Journal of the Korea Contents Association
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    • v.17 no.5
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    • pp.262-272
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    • 2017
  • This study will analyze a case that utilizes not just the characters, which are a primary licensing component in traditional animation licensing, however secondary images such as animation backgrounds, and one that has visually extended their brand. Secondary image plays an important role in developing the narration of the animation, and provides the space where the narrative takes place. It also gives important clues for the characters to be able to develop a narrative, through its chronological and geographical dimensions. This study distinguishes the components that can be used in the licensing process of an original animation into primary usage and secondary usage, and defines the scope of each. Focused on two collaboration cases, Disney's The Jungle Book & KENZO, and Disney's Alice in Wonderland & Marc by Marc Jacobs, It investigates the relationship of visual utilization between the expressive components related to secondary usage in the collaborative case of licensing, and the actual product. This study found the possibility of secondary images as a vehicle to deliver brand identity. As the spectrum of licensing elements is extended, it is necessary to develop an alternative licensing system for the new process of collaboration.

A Study on the Restoration of Stone Railings at Gwanghwamun Woldae in Gyeongbokgung Palace (경복궁 광화문 월대(月臺)의 난간석 복원에 관한 고찰)

  • JEON, Nana
    • Korean Journal of Heritage: History & Science
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    • v.54 no.4
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    • pp.112-131
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    • 2021
  • The Gwanghwamun Gate of the Gyeongbokgung Palace was established in 1866 when Heungseon Daewongun rebuilt the Gyeongbokgung Palace. In Gwanghwamun, a large platform, woldae was established to reveal its hierarchy. The Gwanghwamun Woldae was equipped with stone railings on the left and right sides, fishing routes in the center, and stairs and slopes to the south. The Yongdu Stone was installed on the south side of the slope, which connected to the woldae, to express the path of the king in a formative manner. The Woldae King Road in Gwanghwamun was expanded in 1915 as the Joseon Promotion Conference was held at the Gyeongbokgung Palace and the woldae was destroyed around 1925. Since then, the figure has not been found since the time before the Gwanghwamun Gate. In the Donggureung royal tombs, there are many stones that are not placed in the royal tombs, including voussoir arch stones, Munsojeon Gugi-bi, as well as Nangan-Seokju, Dongja-seok, and Juk-seok, which are elements of the stone railings. These stone railings and Yongdu-seok are seen as stone objects of the Gwanghwamun Woldae, which can be found through the analysis of the style of the times and comparison with modern photographs.

Analysis of Satellite Visibility and High Elevation Satellite using GPS and Beidou in Korea (한국지역에서 GPS와 Beidou의 위성 가시성 및 고앙각 위성 분석)

  • Jang, JinHyeok;Kim, HongPyo;Ahn, Jongsun;Heo, Moon-Beom;Sung, Sangkyung;Lee, Young Jae
    • Journal of Advanced Navigation Technology
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    • v.22 no.6
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    • pp.610-615
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    • 2018
  • Globally, global navigation satellite system (GNSS) is being developed and operated in advanced countries. China's Beidou is developing rapidly, starting with global positioning system (GPS), which is the most representative system. In this paper, we analyze the visibility of Beidou satellite in Korea at present time to utilize rapidly changing Beidou. In this analysis, it is compared with GPS which is stable service. The results of the visibility analysis are based on the results of the mask angle (the low elevation satellite exclusion angle) and the result of the skyplot (a visual representation of the position of the satellite at the user location). Visibility analysis shows that the high elevation angle of Beidou satellite is higher than that of GPS satellite in Korea. In addition, GPS and Beidou's availability and positioning accuracy analysis are performed to confirm the effect of increasing elevation angle satellites. According to the results, Beidou is more effective than GPS in using high elevation satellites in Korea.

Electroencephalogram(EEG) Activation Changes and Correlations of signal with EMG Output by left and right biceps (좌우 이두근의 근전도 출력에 따른 뇌파의 활성도 변화와 관련성 탐색)

  • Jeon, BuIl;Kim, Jongwon
    • Journal of IKEEE
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    • v.23 no.2
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    • pp.727-734
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    • 2019
  • This paper confirms whether the movement or specific operation of the muscles in the process of transferring a person from the brain can find a signal showing an essential feature of a certain part of the brain. As a rule, the occurrence of EEG(Electroencephalogram) changes when a signal is received from a specific action or from an induced action. These signals are very vague and difficult to distinguish from the naked eye. Therefore, it is necessary to define a signal for analysis before classification. The EEG form can be divided into the alpha, beta, delta, theta and gamma regions in the frequency ranges. The specific size of these signals does not reflect the exact behavior or intention, since the band or energy difference of the activated frequencies varies depending on the EEG measurement domain. However, if different actions are performed in a specific method, it is possible to classify the movement based on EEG activity and to determine the EEG tendency affecting the movement. Therefore, in this article, we first study the EEG expression pattern based on the activation of the left and right biceps EMG, and then we determine whether there is a significant difference between the EEG due to the activation of the left and right muscles through EEG. If we can find the EEG classification criteria in accordance with the EMG activation, it can help to understand the form of the transmitted signal in the process of transmitting signals from the brain to each muscle. In addition, we can use a lot of unknown EEG information through more complex types of brain signal generation in the future.

The Articles Related to the Jinjak Process of Gichuk Jinchan Ceremony (1829년 기축진찬의례(己丑進饌儀禮)의 진작(進爵) 기물(器物) 연구)

  • Lee, A-Lum;Lee, Eun-Joo
    • Korean Journal of Heritage: History & Science
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    • v.50 no.4
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    • pp.64-81
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    • 2017
  • Among the royal ceremonies of the Joseon Dynasty era, the articles used in the Jinjak ceremony are symbolic icons of their value during the era. It is very important to identify the purpose of the articles whose usage is ambiguous, by referring to various historical records. Moreover, it should be possible to classify the characteristics and the special context of the article during this process. To accomplish this purpose, I examined the articles related to and used in the processes of Jinjak ceremonies of Outer Jinchan of Myeongjeongjeon and Inner Jinchan of Jagyeongjeon, which are part of the Gichuk Jinchan Ceremony performed in February of the 29th year of King Sunjo. Especially, the definition of Jinjak will not just be limited to the action of offering liquor, but will include the whole series of procedures in offering the liquor. This is because the specific action of offering the liquor expresses cultural concepts and values that have meaning within the historical situation and context in the specific action of offering the liquor. There are three characteristics of the articles related to the Jinjak process of Outer Jinchan and Inner Jinchan of Gichuk Jinchan Ceremony. First, the articles of Jinjak are ranked strictly exactly according to the social status rankings. Second, the Jinjak articles are arranged for their symbolic meanings rather than their purpose. Third, the articles of Jinjak are symbolic icons expressing the values inherent in the process of offering liquor. Recently, there are events reviving the royal court banquet and the increase of interest in the royal culture. It such a situation, the systematic examination of articles of royal court banquets will be a process needed to restore the royal ceremony correctly in the future, and will be the foundation for studying the royal culture of the Joseon dynasty era.