• Journal of information and communication convergence engineering
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• 제6권1호
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• pp.43-46
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• 2008

This paper proposes an advanced test circuit for detecting the connectivity between a drum ring of laser printer and PCB. The detection circuit of charge sharing is proposed, which minimizes the influences of internal parasitic capacitances. The test circuit is composed of precharge circuit, analog comparator, level shifter. Its functional operation is verified using $0.6{\mu}m$ 3.3V/40V CMOS process parameter by HSPICE. Access time is100ns. Layout of the drum contact test circuit is $465{\mu}m\;{\times}\;117{\mu}m$.

• 한국인쇄학회지
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• 제20권2호
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• pp.69-83
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• 2002

This research attempts on plate making for gravure. Direct Hard Dot Method, Helio Kliso Graph, and Laser TB Dot; these three method are the most popular in Korea. For examining ink transmission, three plates were made in the above three different way for the same manuscript and were printed under the same condition. After printing speed was also varied into 150line/inch, 175line/inch, and 200line/inch, ink transmission was examined too. After printing the same manuscript with the above three method then the researcher examined level of ink transmission. Printing lines shows that Laser TB Dot Method and Direct Hard Dot Method were favorable level, while there was big differences of state of Helio Kliso Graph plate.

• 한국인쇄학회지
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• 제10권1호
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• pp.69-80
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• 1992

In screen printing process, printing are streching screen meshs of an angle of 45deg. This angle need much more screen mesh`s quantity of 15% than 22.5deg. To seach mesh angles have affect on reproducting fine line pattern, we modeled the expecting image according to screen angles change and reconfirmed it`s useful and valid from experimentation.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.372-372
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• 2010

본 연구에서는 Digital radiography(DR) 의 X선 필름 제작방식인 직 간접방식의 장점을 가지는 하이브리드 X선 필름를 수행하였다. 형광체로는 Gd2O3:Eu를 제작하였고, 광도전체로는 낮은 누설전류의 특성을 보이는 PbO를 사용하여 Screen printing 방식으로 100um, 200unm, 300um의 두께를 가진 X선 필름을 제작하였다. 그 결과 200un의 두께를 가진 하이브리드 X선 검출기의 Signal 10 noise 의 값이 기존의 사용화 되고 있는 a-Se 기반의 X선 필름보다 200 이상의 SNR을 얻을 수 있었다. 아직까지 기초 단계에 있는 하이브리드 X선 필름의 제작 방식은 향후 더 많은 연구를 통해 기존의 방식을 대체 할 수 있는 신기술, 신개념의 제조공정이 될 것으로 사료된다.

• Journal of the Optical Society of Korea
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• 제20권2호
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• pp.245-250
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• 2016

In this paper, we demonstrate a self-imaging technique that can visualize longitudinal interference patterns behind periodically-structured objects, which is often referred to as Talbot carpet. Talbot carpet is of great interest due to ever-decreasing scale of interference features. We demonstrate experimentally that Talbot carpets can be imaged in a single exposure configuration revealing a broad spectrum of multi-scale features. We have performed rigorous diffraction simulations for showing that Talbot carpet print can produce ever-decreasing structures down to limits set by mask feature sizes. This demonstrates that large-scale pattern masks may be used for direct printing of features with substantially smaller scales. This approach is also useful for characterization of image sensors and recording media.

• 복식문화연구
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• 제18권2호
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• pp.229-244
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• 2010

This study aims to discuss the type and characteristics of primitivism in the modern fashion of the $21^{st}$ century and, as a research method, the concept of primitivism as well as the transition of the patterns of primitivism expressed in modern art have been considered and reviewed through a variety of references. In particular, an empirical analysis of the works that have been created from 2000 to 2009 has been performed using domestic and overseas fashion and collection magazines. The characteristics of primitivism in modern fashion possess the following types of expression: First, Sensuality can be cited as one of the characteristics, either by using direct or indirect exposure of the human body, a silhouette which fits tightly to the body, or creating the effect of sensual beauty using animal fur or bird feathers. Second, Incantation: Masks symbolizing primitive incantation are used to cover the human face or primitive incantation is incorporated as a theme of hair accessories or fashion trinkets, etc. In addition, such decorations as tattoos and the body colorations of ancient tribes are reproduced in modern fashion by means of body painting, printing or other accessories, emphasizing the image of occult primitiveness. Third, Naturalness can be cited as one of the characteristics. Naturalness is emphasized in modern fashion not through artificial decorations and processing, but rather through different patterns of exposure by which natural purity can be felt or through the use of non-artificial materials which recalls primitive civilization. Forth, Playfulness is expressed in the form of graffiti or abstract letters and paintings, and the character of the play is often expressed by the use of grotesque images based on various distortions and exaggerations of the human body, the utilization of symbols of primitive incantation and body and/or facial painting. Fifth, Lastly 'folkishness is emphasized. Folk-like objects, facial decorations, exposure of the body and intense color contrasts typically represent the folkish characteristics.

• 한국운동역학회지
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• 제31권3호
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• pp.183-188
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• 2021

Objective: The purpose of this study was to develop a stretchable joint motion sensor that is based on silver nano-particle. Through this sensor, it can be utilized as an equipment for rehabilitation and analyze joint movement. Method: In this study, precursor solution was created, after that, nozel printer (Musashi, Image master 350PC) was used to print on a circuit board. Sourcemeter (Keithley, Keithley-2450) was used in order to evaluate changes of electric resistance as the sensor stretches. In addition, the sensor was attached on center of a knee joint to 2 male adults, and performed knee flexion-extension in order to evaluate accurate analysis; 3 infrared cameras (100 Hz, Motion Master 100, Visol Inc., Korea) were also used to analyze three dimensional movement. Descriptive statistics were suggested for comparing each accuracy of measurement variables of joint motions with the sensor and 3D motions. Results: The change of electric resistance of the sensor indicated multiple of 30 times from initial value in 50% of elongation and the value of electric resistance were distinctively classified by following 10%, 20%, 30%, 40% of elongation respectively. Through using the sensor and 3D camera to analyze movement variable, it showed a resistance of 99% in a knee joint extension, whereas, it indicated about 80% in flexion phase. Conclusion: In this research, the stretchable joint motion sensor was created based on silver nanoparticle that has high conductivity. If the sensor stretches, the distance between nanoparticles recede which lead gradual disconnection of an electric circuit and to have increment of electric resistance. Through evaluating angle of knee joints with observation of sensor's electric resistance, it showed similar a result and propensity from 3D motion analysis. However, unstable electric resistance of the stretchable sensor was observed when it stretches to maximum length, or went through numerous joint movements. Therefore, the sensor need complement that requires stability when it comes to measuring motions in any condition.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.993-994
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• 2008

Electrochromic (EC) devices are capable of reversibly changing their optical properties upon charge injection and extraction induced by the external voltage. The characteristics of the EC device, such as low power consumption, high coloration efficiency, and memory effects under open circuit status, make them suitable for use in a variety of applications including smart windows and electronic papers. Coloration due to reduction or oxidation of redox chromophores can be used for EC devices (e-paper), but the switching time is slow (second level). Recently, with increasing demand for the low cost, lightweight flat panel display with paper-like readability (electronic paper), an EC display technology based on dye-modified $TiO_2$ nanoparticle electrode was developed. A well known organic dye molecule, viologen, was adsorbed on the surface of a mesoporous $TiO_2$ nanoparticle film to form the EC electrode. On the other hand, ZnO is a wide bandgap II-VI semiconductor which has been applied in many fields such as UV lasers, field effect transistors and transparent conductors. The bandgap of the bulk ZnO is about 3.37 eV, which is close to that of the $TiO_2$ (3.4 eV). As a traditional transparent conductor, ZnO has excellent electron transport properties, even in ZnO nanoparticle films. In the past few years, one-dimension (1D) nanostructures of ZnO have attracted extensive research interest. In particular, 1D ZnO nanowires renders much better electron transportation capability by providing a direct conduction path for electron transport and greatly reducing the number of grain boundaries. These unique advantages make ZnO nanowires a promising matrix electrode for EC dye molecule loading. ZnO nanowires grow vertically from the substrate and form a dense array (Fig. 1). The ZnO nanowires show regular hexagonal cross section and the average diameter of the ZnO nanowires is about 100 nm. The cross-section image of the ZnO nanowires array (Fig. 1) indicates that the length of the ZnO nanowires is about $6\;{\mu}m$. From one on/off cycle of the ZnO EC cell (Fig. 2). We can see that, the switching time of a ZnO nanowire electrode EC cell with an active area of $1\;{\times}\;1\;cm^2$ is 170 ms and 142 ms for coloration and bleaching, respectively. The coloration and bleaching time is faster compared to the $TiO_2$ mesoporous EC devices with both coloration and bleaching time of about 250 ms for a device with an active area of $2.5\;cm^2$. With further optimization, it is possible that the response time can reach ten(s) of millisecond, i.e. capable of displaying video. Fig. 3 shows a prototype with two different transmittance states. It can be seen that good contrast was obtained. The retention was at least a few hours for these prototypes. Being an oxide, ZnO is oxidation resistant, i.e. it is more durable for field emission cathode. ZnO nanotetropods were also applied to realize the first prototype triode field emission device, making use of scattered surface-conduction electrons for field emission (Fig. 4). The device has a high efficiency (field emitted electron to total electron ratio) of about 60%. With this high efficiency, we were able to fabricate some prototype displays (Fig. 5 showing some alphanumerical symbols). ZnO tetrapods have four legs, which guarantees that there is one leg always pointing upward, even using screen printing method to fabricate the cathode.

• 만화애니메이션 연구
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• 통권46호
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• pp.207-231
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• 2017

판화는 순수예술의 한 분야이면서 에디션(edition)이라는 특수성 때문에 대중적인 성격을 띤 상업적 결과물로 인식되는 모호한 경계에 놓여져 있다. 현대의 과학기술 발전은 판화의 새로운 기법을 발달시켰고 디지털(digital)이라는 컴퓨터와의 융합은 복제예술로서의 가능성을 보여주었다. 복제 판화는 사진과 접하며 확장된 영역으로의 지대한 영향을 받았고 프린트의 다양한 형태는 간접예술의 가능성을 여러 각도로 자극함으로써 많은 변화와 시도를 가져왔다. 판화와 과학기술의 역사가 밀접하게 관련되어 있듯이 컴퓨터의 발달은 복수예술성의 광범위한 영역확대, 기술적, 예술적 변화를 시도하게 만든다. 디지털이 갖는 매끈한 평면위에 판화의 물성을 얹음으로 단순히 복사된 이미지 위에 새로운 개념의 형상을 만들어낼 수 있는 과정과 결과는, 일품미술의 가치 혹은 판화가 주는 물성의 특성과는 또 다른 독특한 작품의 영역을 보여준다. 복제성에 대한 폄하된 인식은 판화와 직결된 의미로 작품의 가치를 평가하였고 복제된 각 에디션의 가치와는 무관하게 한 묶음의 작품으로 평가절하 되는 것은 부인 할 수 없는 사실이다. 그러나 종이 위에 찍혔던 판화의 물성은 캔버스위에 손으로 직접 그리는 핸드드로잉(hand drawing)과 함께 올려지고, 디지털 프린트라는 정보의 종이위에 결합하는 과정을 통해 새로운 면모와 변화를 보여주는 계기가 된다. 매체가 주는 다양성은 예술과 과학기술사이에서 때로는 정체성의 논란이 되기도 한다. 앞으로 예술의 영역에서 누릴 수 있는 매체성의 한계를 어떤 기준으로 정할 수 있을지도 논의가 되어야 할 것이다.

• 한국방사선학회논문지
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• 제3권2호
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• pp.27-31
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• 2009

현재 의료용 엑스선 장비는 기존의 아날로그 방식의 필름, 카세트를 대신하여 디지털 방식인 CR, DR 이 널리 사용되면 그에 관한 연구개발이 활발히 진행되고 있다. 본 연구 에서는 디지털 엑스선 장비의 변환물질로 $BiI_3$(Bismuth tri-iodide)를 적용하여 실험하였으며 기존 선행연구에 비해 만족할만한 결과 값은 얻을 수 없었지만 가장 많이 사용되고 있는 a-Se(Amorphous Selenium)의 단점인 고전압인가와 제작방식의 어려움을 보완할 수 있는 새로운 가능성을 제시해 주었다. 본 연구에서 사용되어진 변환 물질은 순도 99.99%의 $BiI_3$가 이용되었으며 $3cm{\times}3cm$의 크기와 200um의 두께를 가지는 변환물질 층이 제작되었다. 변환 물질의 상하부에는 Magnetron Sputtering system장비를 이용한 ITO 전극이 형성되었다. 형성된 $BiI_3$ 엑스선 변환 물질의 특성 평가를 위해 구조적 분석과 전기적 분석이 이루어 졌다. SEM 측정을 통해 제작된 필름의 표면 및 단면적, 구성 성분을 관찰하였고, 전기적 분석을 위해서는 누설전류, 엑스선에 대한 신호량 및 잡음 대 신호비의 관찰이 이루어졌다. 실험 결과 $BiI_3$는 $1.6nA/cm^2$의 누설전류와 $0.629nC/cm^2$의 신호량을 측정할 수 있었으며, 이렇게 Screen print method로 제작된 엑스선 검출 물질은 PVD방법을 이용해 제작된 물질과 비슷하거나 더 나은 전기적 특성을 가지고 있었고 이는 제작 방법의 간소화 및 수율을 향상 시킬 수 있어 BiI3도 a-Se를 대체하기 위한 변환물질로 적합하다고 사료된다.