• 대한영상의학회지
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• 제84권5호
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• pp.1047-1065
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• 2023

다중검출기컴퓨터단층촬영(multi-detector CT; 이하 MDCT)은 높은 정확도를 가진 진단도구로서 충수염과 그 합병증을 평가하기 위해 보편적으로 사용된다. MDCT 소견에 근거한 충수염의 진단은 영상 소견이 전형적인 모습과 일치하지 않을 때 어려울 수 있다. 비전형적인 충수염에는 충수 및 맹장의 위치이상을 동반하는 경우, 합병증이 나타난 경우 그리고 충수염을 모방하거나 유발하는 병리학적 소견을 동반한 경우 등 다양한 스펙트럼의 질환이 포함된다. 본 임상화보는 비전형적이고 복잡한 충수염 및 충수염과 유사한 상태의 다양한 스펙트럼을 위치이상, 드문 합병증 및 종양, 반응성 충수염, 충수게실염, IgG4 연관 질환을 포함한 병리학적 이상의 관점에서 설명했다. 본 임상화보를 통해 독자들은 다양한 스펙트럼의 비전형적 충수염 MDCT 소견에 더 익숙해질 수 있다.

• 한국과학교육학회지
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• 제28권4호
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• pp.340-349
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• 2008

이 연구에서는 비유를 사용한 반응 속도 개념 학습에서 유발되는 학생들의 대응 오류를 조사하고, 비유 표현 방식에 따라 비교하였다. 고등학교 1학년 학생 418명을 '농도와 반응 속도' 및 '온도와 반응 속도'의 목표 개념과 비유물의 글 또는 글과 그림 형태의 표현방식에 따라 4집단으로 배치하였다. 각 집단에 해당하는 비유 수업을 한 후, 대응 관계 이해도 검사를 실시하였다. 연구 결과, 과잉 대응, 인위적 대응, 대응 불이행, 무분별한 대응, 부적절한 대응, 표면적 속성 대응, 비유물 속성 보유, 불가능한 대응의 8가지 대응 오류 유형이 나타났다. 또한, 비유 표현 방식과 목표 개념의 속성에 따라 학생들이 범하는 대응 오류 유형의 빈도가 다른 양상을 보였다. 이에 대한 교육학적 함의를 논의하였다.

• 동양고전연구
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• 제32호
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• pp.425-441
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• 2008

우리나라 근대기의 경매도록 및 전람회 도록은 대개 1930년대에 간행된 것이 대부분을 차지한다. 1930년대는 1929년 미국에서 발생한 주가대폭락의 여파로 경제침체가 계속된 대공황시기였지만 이 시기 일본은 중국 동북지역 침략을 넘어 본격적인 대륙침략기로 접어들었다. 1930년대는 골동업자들에게는 '골동품거래 호황기', 도시 문화적 측면에서는 현대성의 단초가 형성된 시기로 평가된다. 당시 발간된 경매도록을 위시한 근대 전람회 관계 자료의 수집, 영인, 정리 작업은 우리나라 서화와 골동의 유통사를 복원하게 해줌은 물론 서화에서 미술로의 근대적 전환기 미술의 특징을 알 수 있게 해준다는 점에서 중요하다. 나아가 동아시아 근대 미술품 유통사의 재구성에도 이들 자료는 중요한 자료가 될 것이다. "조선도자목공전관" 도록은 비록 작고 얇은 도록이지만 우리나라의 수준 높은 도자기와 목공품을 수록하고 있다. '조선도자목공전'은 정확한 개최시기를 알 수 없지만 1930년대 일본 동경에서 개최되었을 것으로 추정되며 작품판매도 했을 것으로 여겨진다. 이처럼 일제시대의 경매도록류와 전람회 관계 연구는 우리 미술품의 일본 유출경로를 밝히는 작업이 된다는 점에 일차적 중요성이 있다. 나아가 당시 사회의 미술품 인식과 취향 등의 흐름과 단면을 살피는 예술사회학적 연구가 될 수 있을 것이다. 앞으로 근대기 서울의 미술시장은 물론 동경, 오사카 등 당시 일본에서 개최된 경매회와 전람회에 대한 비교 연구도 요구된다.

• ETRI Journal
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• 제25권3호
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• pp.156-170
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• 2003

Gamut compression algorithms have traditionally been defined functionally and then tested with deductive methods, e.g., psychophysical experiments. Our study offers an alternative, an inductive method, in which observers judge image colors to represent the original images more accurately. We developed a computer-controlled interactive tool that modifies the color appearance of pictorial images displayed on a monitor. In experiments, observers used the tool to alter color pixels according to the region of color space to which they belonged. We created three different gamut compression algorithms based on the observer experimental data. Observer groups evaluated the performance of the newly-developed algorithms, existing gamut compression algorithms, and an image based on the average observers' results from experiments in this study. The study of gamut extension is unlike the study of gamut compression in that it mainly deals with the degree of image pleasantness as judged by observers. The results of the gamut extension experiments in this study not only make available worthwhile data but also suggest a methodology for using the observer experimental tool for future gamut extension research.

• 전기의세계
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• 제17권2호
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• pp.11-15
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• 1968

One of the most important methods used in the modern analysis of linear networks and systems is the signal flow graph technique, first introduced by S.J. Mason in 1953. In essence, the signal-flow graph technique is a graphical method of solving a set of simultaneous. It can, therefore, be regarded as an alternative to the substitution method or the conventional matrix method. Since a flow-graph is the pictorial representation of a set of equations, it has an obvious advantage, i.e., it describes the flow of signals from one point of a system to another. Thus it provides cause-and-effect relationship between signals. And it often significantly reduces the work involved, and also yields an easy, systematic manipulation of variables of interest. Mason's formula is very powerful, but it is applicable only when the desired quantity is the transmission gain between the source node and sink node. In this paper, author summarizes the signal-flow graph technique, and stipulates three rules for conversion of an arbitrary nonsource node into a source node. Then heuses the conversion rules to obtain various quantities, i.e., networks gains, functions and parameters, through simple graphical manipulations.

• Agricultural and Biosystems Engineering
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• 제1권1호
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• pp.22-29
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• 2000

The development of bio-response feedback control system known as the speaking plant approach has been a challenging task for plant production engineers and scientists. In order to achieve the aim of developing such a bio-response feedback control system, the primary concern should be to develop a practical non-invasive technique for monitoring plant growth. Those who are skilled in raising plants can sense whether their plants are under adequate water conditions or not, for example, by merely observing minor color and tone changes before the plants wilt. Consequently, using machine vision, it may be possible to recognize changes in indices that describe plant conditions based on the appearance of growing plants. The interpretation of image information of plants may be based on image features extracted from the original pictorial image. In this study, the performance of a finite element retina was optimized by a genetic algorithm. The optimized finite element retina was evaluated based on the performance of neural plant growth monitor that requires input data given by the finite element retina.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2001년도 추계학술대회 학술발표 논문집
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• pp.279-282
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• 2001

This paper presents an image contrast enhancement technique for improving the low contrast images using the improved IAFC(Integrated Adaptive Fuzzy Clustering) Model. The low pictorial information of a low contrast image is due to the vagueness or fuzziness of the multivalued levels of brightness rather than randomness. Fuzzy image processing has three main stages, namely, image fuzzification, modification of membership values, and image defuzzification. Using a new model of automatic crossover point selection, optimal crossover point is selected automatically. The problem of crossover point selection can be considered as the two-category classification problem. The improved MEC can classify the image into two classes with unsupervised teaming rule. The proposed method is applied to some experimental images with 256 gray levels and the results are compared with those of the histogram equalization technique. We utilized the index of fuzziness as a measure of image quality. The results show that the proposed method is better than the histogram equalization technique.

• 한국정보처리학회논문지
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• 제7권6호
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• pp.1874-1885
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• 2000

When a receiver of ciphertext message can not decrypt a message because he has lost his private-key, the private-key of receiver and session-key of the message should be recovered. In this paper, we developed an Encapsulation based Key Recovery System (EKRS). EKRS is a new key encapsulation based key recovery system which is characterized by secretly choice of KRA, randomized target keys. n-way recovery type, and useful for commercial key recovery. EKRS is formally specified by a pictorial model, an Extended Cryptographic Timed Petri Net (ECTPN). Secure information flow and reachability of a session-key are verified by using reachability graph of ECTPN. EKRS, executing over a Public Key Infrastructure, can be used as a security solution in Web based applications such as CALS, EC an EDI.

• 디자인학연구
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• 제19권3호
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• pp.71-92
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• 2006

People have their own cultural backgrounds and experiences in terms of visual perceptional thinking so that they could misunderstand the cultural symbols, trademarks, Brand Identities, and trade characters, especially, animal trademarks. Sometimes Easterners and Westerners seem to not comprehend the different meanings of the cultural symbols. The signs of twelve Chinese zodiac animals are the typical symbol of the Asian mythology. What I wanted to focus on emphasizing the different views and perspective of an animal trademark is according to the Chinese Zodiac between Eastern and Western cultures. Generally, multiple symbolisms are difficult to comprehend, because they are created by individual ideas and incorporate several mythologies and histories. How do Westerners interpret the implied meaning of Eastern animals in general? How are they going to understand the Eastern animal logos or marks accurately? How can we solve the problem to make people understand their different meanings? There were some confusing pictorial images in the area of the design field when a designer creates an animal mark for globalization and localization. Creating of hybrid symbol is the best way to break the communication barriers with people all around the world.

• 환경생물
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• 제37권3호
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• pp.396-405
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• 2019

A new species of free-living marine nematode is described from intertidal sediments of the East Sea, Korea. Phanoderma koreense sp. nov. is characterized by the presence of well-developed pharyngeal and cephalic capsule, six inner labial sensilla present as minute papillae around with circular groove, long and slender spicules with 4-5 serrated distal end, located at the base of the precloacal supplement, a series of eight to nine stout and short setae on the ventral cloacal region and conico-cylindrical tail with two pairs of blunt setae. In this study, we provide taxonomic descriptions and illustrations of a new species by differential interference contrast microscope and a pictorial key to the valid species of Phanoderma Bastian, 1865. This is the first record of the genus Phanoderma in the East Sea, Korea.