• 한국세라믹학회지
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• 제31권2호
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• pp.161-170
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• 1994

For the preparation of short ceramic fibers of which average length might be in accordance with the opening size of sieve, e.g., 150${\mu}{\textrm}{m}$ or 300${\mu}{\textrm}{m}$, bulk fibers were grounded on sieve screen by applying both compressing and shearing force, and passed through the sieve screen. The grounded fibers were subjected to gravitational settling processes. The classified fibers were observed by scanning electron microscopy and the length of each fiber was measured to correlate the average length with the opening size of the sieve used for grinding bulk fibers. Theoretical analysis show that a free settling technique is ineffective for the classification of fibers by length compared with that of particles. The average lengths of classified fibers estimated by scanning electron microscopy were in good agreement with those obtained by relative packing volume of the fibers. Accordingly, it is confirmed that average fiber lengths can be determined from bulk volume data without photographing, counting and averaging results for hundreds of fibers.

• Journal of Information Technology Applications and Management
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• 제23권3호
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• pp.49-59
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• 2016

Rapid technological advancements and widespread adoption of smart phones in recent years provide students with new opportunities for getting knowledge and making researches in innovation century. As the penetration of smart phone devices in education increases, there is a large growth in the use of these devices especially among the youth. In spite of increasing importance of smart devices in education, the significant features of these technology devices for general learning have not been experientially addressed. In this study we are going to investigate the comparison of smart phone devices and find the necessary conditions for using mobile devices as an educational tool by a conjoint method. There will be five attributes: screen size, batter type, mobile OS, memory capacity and price. By surveying we got the results which showed us the respondents' desire of using specific smart phone; thus, we defined that screen size attribute is the most important device characteristic.

• 한국결정성장학회:학술대회논문집
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• 한국결정성장학회 1998년도 PROCEEDINGS OF THE 15TH KACG TECHNICAL MEETING-PACIFIC RIM 3 SATELLITE SYMPOSIUM SESSION 4, HOTEL HYUNDAI, KYONGJU, SEPTEMBER 20-23, 1998
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• pp.79-83
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• 1998

Plasma display panel is a potential candidate for HDTV, due to the fact hat the expansion of screen size is much easier using thick film technology. In this study, transparent dielectric materials using lead borosilicate glasses is developed, which satisfy the requirements of dielectrics for PDP. Paste is made of this glass composition. The paste has thixotropic behavior suitable for screen printing. The paste shows more thixotropic behavior as the particle size decrease. After firing, cross sectional area was analyzed by SEM. The void of fired thick film was removed using bimodal particle system. The dielectric showed good adhesion characteristics.

• 대한디지털의료영상학회논문지
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• 제2권1호
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• pp.92-95
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• 1996

Computed Radiography(CR) is a relatively new technology that relies on an image plate(IP) as an alternate x-ray sensor to screen/film. Standard CR cassettes do not have lead foil behind the IP to control scatter radiation. The result of this study indicate that such control is needed. In most screen/film cassettes, that lines the rear of the cassette eliminates back scatter radiation. This study was performed to Investigate on the effects of back scatter in CR images by size of exposure field, distance between the CR cassette and the wall of radiography room. 1. It showed artifacts from hinges and clips located on the back of CR cassette by back scatter radiation. 2. The greater effects of back scatter radiation in CR images was attributed to the greater size of exposure field and the longer distance between the CR cassette and the wall of radiography room.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2004년도 추계학술대회 논문집
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• pp.501-502
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• 2004

• 한국콘텐츠학회논문지
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• 제15권9호
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• pp.37-46
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• 2015

오늘날 웨어러블 디바이스가 각광을 받으면서, 스마트 워치는 웨어러블 시장을 이끌어갈 디바이스로 주목받고 있다. 하지만 이러한 스마트워치는 많은 기업의 투자와 소비자의 관심에도 불구하고 스마트폰을 보조하는 도구에 불과하다는 인식을 받고 있다. 따라서 본 연구에서는 스마트워치가 폭발적인 성장세를 보이지 못하는 이유 중 스마트워치의 작은 화면이 주는 불편함에 초점을 맞추어 연구를 진행하고자 한다. 먼저 스마트 워치의 작은 화면을 극복하기 위해 필요한 이론적 배경에 대해 스마트 기기연동, 프로젝터 기술, 플렉서블 디스플레이 3가지로 나누어 사용자의 실효성 측면에서 제시하였다. 그 후 이론적 배경을 토대로 스마트워치가 나아가야 할 방향에 대해서 크게 2가지로 나누어 설명하고 있다. 먼저 '디스플레이'에 관해서 경계 없는 디스플레이와 사물 디스플레이를 제시하고 있으며, '인터랙션' 방법에 관하여 인터랙션 방법의 진화, 2가지 인터랙션의 결합 방법, 인터랙션 디자인의 변화를 제시하고 있다. 본 연구가 제시한 방법은 미래에 스마트워치가 웨어러블 시장에서 주요 상품으로 자리 매김하는데 도움이 될 것이다.

• Asian Pacific Journal of Cancer Prevention
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• 제15권14호
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• pp.5901-5908
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• 2014

Background: Data from BreastScreen Australia Screening and Assessment Services (SAS) for 2002-2010 were analysed to determine whether some SAS characteristics were more conducive that others to high screening performance, as indicated by high priority performance indicators and standards. Materials And Methods: Indicators investigated related to: numbers of benign open biopsies, screen-detected invasive cancers, and interval cancers, and wait times between screening and assessment. Multivariate Poisson regression was undertaken using as candidate predictors of performance, SAS size (screening volume), urban or rural location, year of screening, accreditation status, and percentages of clients from culturally and linguistically diverse backgrounds, rural and remote areas, and socio-economically disadvantaged areas. Results: Performance standards for benign biopsies and invasive cancer detection were uniformly met irrespective of SAS location and size. The interval cancer standard was also met, except in 2003 when the 95% confidence interval of the rate still incorporated the national standard. Performance indicators improved over time for: benign open biopsy for second or subsequent screening rounds; rates of invasive breast cancer detection for second or subsequent screening rounds; and rates of small cancer detection. No differences were found over time in interval cancer rates. Interval cancer rates did not differ between non-metropolitan and metropolitan SAS, although state-wide SAS had lower rates. The standard for wait time between screening and assessment (being assessed ${\leq}28$ days) was mostly unmet and this applied in particular to SAS with high percentages of culturally and linguistically diverse women in their screening populations. Conclusions: Gains in performance were observed, and all performance standards were met irrespective of SAS characteristics, except wait times to assessment. Additional descriptive data should be collected on SAS characteristics, and their associations with favourable screening performance, as these may be important when deciding on SAS design

• 한국컴퓨터정보학회논문지
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• 제18권11호
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• pp.69-75
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• 2013

본 논문에서는 터치스크린 시스템에 강한 잡음이 존재하는 상황에서 안정적으로 터치를 인식하기 위하여 SIFT(Scale Invariant Feature Transform) 알고리즘을 기반으로 고안한 터치인식 방법을 소개한다. SIFT알고리즘을 기반으로 하여 잡음에 강하며 다양한 크기의 터치를 효과적으로 추출하는 것이 가능하다. 제안한 방법을 검증하기 위하여 터치스크린 상에서 얻은 채널데이터를 이용하여 매트랩 상에서 터치인식을 시뮬레이션 해 보았다. 시뮬레이션 결과 강한 잡음이 존재하는 상황에서 터치 크기와 방향에 상관없이 안정적으로 터치를 인식하는 것을 볼 수 있었다. 그러나 터치인식 알고리즘을 실제 터치스크린 상에 구현한 결과 SIFT 알고리즘에서 사용하는 DoG(Difference of Gaussian) 연산에 많은 계산 량이 필요하여 실시간 터치인식에 문제가 발생하였다. 우리는 이를 극복하기 위하여 DoG의 빠른 근사 방법인 DoM(Difference of Mean)을 사용하여 문제를 해결하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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• pp.685-688
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• 2003

[ $(Ba,Sr,Ca)TiO_3$ ] powders, prepared by the sol-gel method, were mixed with an organic vehicle and the BSCT thick films were fabricated by the screen printing techniques on alumina substrates. The grain size decreased with increasing amounts of $MnO_2$, and the BSCT(50/40/10) thick film doped with 1wt% $MnO_2$ showed a value of 6.5mm. The thickness of thick films by four-cycle on printing/drying was approximately 100mm. The relative dielectric constant, dielectric loss and tunability of the BSCT(S0/40/10) thick films doped with 1.0wt% $MnO_2$ were 1296, 0.61% and 11.18%, respectively.

• Journal of the Optical Society of Korea
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• 제14권4호
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• pp.333-336
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• 2010

The generation of coherent x-ray beams by using a multi-slit diffraction phenomenon is presented. The mode-confinement conditions in the x-ray waveguide (XWG) needed to obtain single-mode beams are determined. The XWGs are stacked to form an XWG array. The core of the XWG array is used as a slit in an opaque screen, similar to those used for visible light. Diffraction patterns that interfered constructively in the XWG array are investigated based on multi-slit diffraction theory. The irradiance distributions are studied at on observation screen. The FWHM of diffracted x-ray spectra were between $1.67{\times}10^{-4}$ to $3.30{\times}10^{-5}$ radians which lead to a spot-size of a few tens of micrometers on the screen at distance of 1 m. The intensities decrease with increase in the period of the XWG array, i.e. a thicker cladding, due to growth of the higher-order diffraction peaks.