• 한국정보통신학회논문지
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• 제8권7호
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• pp.1546-1552
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• 2004

전자 잉크 데이터는 펜 기반 컴퓨터나 PDA(Personal Digital Assistants)둥에서 자연스럽고 편리한 데이터 입력을 제공하기 위해 펜으로 입력한 데이터를 온라인 문자 인식기를 이용하여 아스키 문자로 변환하지 않고 스크립트 형태로 저장하는 데이터를 말한다. 전자 잉크 데이터를 사용하기 위해 가장 중요한 것 중 하나는 전자 잉크 데이터의 검색 문제이다. 본 연구에서는 전자 잉크 데이터를 획 특징 벡터 형태로 저장하고, 이를 이용해서 잉크 데이터를 검색하는 정합 알고리즘을 제안하고 구현하였다. 제안된 정합 알고리즘은 입력된 데이터를 곡률을 이용하여 기본획으로 분리하고 기본획의 종류를 결정한 다음 획 특징 벡터를 생성한다. 그리고 동적 프로그래밍 기법에 의해 획 특징 벡터의 거리값을 계산한다.

• Journal of Periodontal and Implant Science
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• 제30권1호
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• pp.179-187
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• 2000

The objectives of this study were to measure keratinized gingival thickness in healthy Korean adults, and to correlate the keratinized gingival thickness with width of keratinized gingiva, probing pocket depth and gingival recession.Thickness measurements were performed in 37 Korean dental students using an ultrasonic device(SDM). Width of keratinized gingiva, gingival recession and probing pocket depth were measured with a Williams periodontal probe.The results showed that the keratinized gingival thickness varied from 0.83 mm(canines) to 1.16 mm(central incisors) in the maxilla and, in the mandible, from 0.68 mm(1st premolars) to 1.69 mm(2nd molars). In a stepwise multiple linear regression analysis, 23% of variation of gingival thickness could be explained by width of keratinized gingiva and probing pocket depth. It could be concluded that the keratinized gingival thickness depends on tooth type and correlates with width of keratinized gingiva and probing pocket depth.

• Computers and Concrete
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• 제20권4호
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• pp.483-490
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• 2017

This paper studies on the behavior of reinforced concrete (RC) pipes used in basic sanitation in the conduction of storm water and sanitary sewer. Pipes with 800 mm and 1200 mm in diameter were analyzed. The 800 mm pipes were built with simple reinforcement and the 1200 mm pipes with double reinforcement. For the two diameters of pipes the presence or absence of the pocket was evaluated, and the denomination of each one is spigot and pocket pipe (SPP) and ogee joint pipe (OJP), respectively. The 3D numerical models reproduce the three-edge-bearing test that provides information about the strength and stiffness of the reinforced concrete pipes. The validation of the computational models was carried out comparing the vertical and horizontal displacements on the springline and crown/invert and it was also evaluated the reinforcement strains and the crack pattern. As a main conclusion, the numerical models represented satisfactorily the behavior of the pipes and can be used in future studies in parametric analysis.

• Journal of Mechanical Science and Technology
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• 제19권12호
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• pp.2197-2204
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• 2005

The combination of Gas chromatography (GC) for separation and Flame Ionization Detection (FID) for detection and identification of the components of a mixture of compounds is a fast and strongly proved method of analytic chemistry. The objective of this research was to design a combined High-speed miniature screening Gas chromatograph along with a Flame Ionization Detector for quick, quantitative and qualitative analysis of gas components. This combined GC-FID system is suitable to detect the volatile and semi-volatile hydrocarbons present in a gas mixture. The construction made it less expensive, easy to use and movable. The complete gas path was developed. On/off valves, temperature and flow sensors and their interface electronics were used for controlling purpose. A Microcontroller was programmed to measure the temperature and gas flow using the sensors and to control and regulate them using the electronics and valves. A pocket PC with its touch screen served as a user interface for the system. Software was developed for the pocket PC, which makes the communication possible with the Microcontroller. The system parameters can be indicated in the Pocket PC as simple text and also the analysis result can be displayed.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.167-169
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• 2016

이 논문은 라인 터널링과 포인트 터널링을 모두 고려한 포켓 터널링 전계효과 트랜지스터의 여러가지 구조 및 물질 파라미터에 따른 시뮬레이션 결과를 소개한다. 포켓의 도핑 농도와 두께가 증가할수록 구동전류 $I_{on}$이 증가하고 포켓의 두께와 게이트 절연체의 유전율이 증가할수록 SS(subthreshold swing)가 좋아짐을 보인다. hump 효과는 SS를 나쁘게 하기 때문에 최소화할 수 있도록 최적의 구조를 만들어야 한다.

• 대한조선학회논문집
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• 제58권5호
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• pp.271-280
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• 2021

The code developed using a pressure-based method for unified conservation laws of incompressible/compressible fluids is expanded to handle moving or deforming body boundaries using the hybrid Cartesian/immersed boundary method. An instantaneous pressure field is calculated from a pressure Poisson equation for the whole fluid domain, including the compressible gas region. The polytropic gas is assumed for the compressible fluid so that the energy equation is decoupled. Immersed boundary nodes are identified based on edges crossing body boundaries. The velocity vector is reconstructed at the immersed boundary node using an interpolation along the assigned local normal line. The developed code is validated by comparing the time histories of pressure and wave elevation for sloshing in a rectangular and a membrane-type tank. The validated code is applied to simulate air cushion effects in a rectangular tank under sway motion. Time variations of pressure fields are analyzed in detail as the air pocket pulsates. It is shown that the contraction and expansion of the air pocket dominate the pressure loads on the wall of the tank. The present results are in good agreement with other experimental and computational results for the amplitude and the decay of the pressure oscillations measured at the pressure gauges.

• 한국정밀공학회지
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• 제12권7호
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• pp.32-45
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• 1995

In this paper, we present a new method to tool path planning problem for rough cut of pocket milling operations. The key idea is to formulate the tool path problem into a TSP (Travelling Salesman Problem) so that the powerful neural network approach can be effectively applied. Specifically, our method is composed of three procedures: a) discretization of the pocket area into a finite number of tool points, b) neural network approach (called SOM-Self Organizing Map) for path finding, and c) postprocessing for path smoothing and feedrate adjustment. By the neural network procedure, an efficient tool path (in the sense of path length and tool retraction) can be robustly obtained for any arbitrary shaped pockets with many islands. In the postprocessing, a) the detailed shape of the path is fine tuned by eliminating sharp corners of the path segments, and b) any cross-overs between the path segments and islands. With the determined tool path, the feedrate adjustment is finally performed for legitimate motion without requiring excessive cutting forces. The validity and powerfulness of the algorithm is demonstrated through various computer simulations and real machining.

• 대한전자공학회논문지SD
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• 제42권4호
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• pp.1-8
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• 2005

소오스와 드레인 근처에 포켓이온이 주입된 halo구조의 MOSFET에서 전송자의 이동도 감소는 포켓이온주입의 조건에 따라 이온화된 불순물의 증가에 따른 쿨롱(Coulomb) 산란율의 증가에 의한 이동도의 감소량보다 큰 이동도의 감소가 관측될 수 있다. 게이트 바이어스에 대한 이동도의 특성변화도 기존의 일차적인 쿨롱산란의 증가효과에 의한 해석과 비교하여 상이한 결과가 나타날 수 있음이 실험적으로 확인되고 있다. 본 연구에서는 포켓이온 주입에 의하여 쿨롱산란원이 되는 유효불순물 농도의 증가에 따른 일차적인 이동도의 감소효과를 벗어난 이동도 특성을 분석하여 이동도의 감소현상을 일반적으로 설명할 수 있는 개선된 해석적 모델을 제시하였다. 해석적인 결과를 도출하기 위하여 일차원 영역구분의 근사방법을 적용한 결과, 포켓이온 주입에 의하여 포논산란율 및 표면산란율(surface roughness scattering rate)의 증가도 이동도감소에 기여함이 보여 졌다. 채널의 전송자분포가 드레인 전류에 영향을 미치게 되므로 포켓이온에 의해 유발된 전송자분포의 효과를 분석하여 유효이동도가 추가적으로 감소함을 확인하였다.

• Journal of Preventive Medicine and Public Health
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• 제32권4호
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• pp.546-555
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• 1999

Objectives : To determine the prevalence, pattern. and out-of-pocket expenditure of complementary and alternative medicine (CAM) utilization in Korean adult population. Methods : We conducted a representative telephone survey of 2,042 persons aged 18 or older. Data about any health problem, details of their use of medical doctors(MDs) offices/hospitals/pharmacies services and CAM during the preceding 12 months were collected with structured questionnaire. Results : The utilization rate of CAM among Korean adults was 29% in one year. A total of 231 kinds of CAM was identified from this survey. Annual out-of-pocket expenditure associated with CAM use in 1998 amounted to ${\xi}{\S}1.88$ billion and was comparable to 40.8% of out-of-pocket expenditure paid for MDs offices/hospitals/pharmacies services. Among those(N=424) who paid for both MDs offices/hospitals/pharmacies services an d CAM, 35.8% paid more for CAM. CAM gave more satisfaction than western medicine to those who had experience of both types of therapy. About half of CAM users were willing to recommend CAM to others. Disclosure rate to physician among CAM users was not high(40.6%). Conclusion : CAM became a popular source of health care in Korea, Korean spent a substantial amount of out-of-pocket money on CAM without any public control. Because CAM use is likely to be increased rapidly through lay referral system, health policy makers and health professionals should pay more attention to CAM for making appropriate utilization of CAM.

• 한국산학기술학회논문지
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• 제16권1호
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• pp.480-489
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• 2015

본 연구는 스마트폰에서 손쉽게 접근할 수 있는 심폐소생술 앱의 교육 효과를 비교 분석하고자 시도되었다. 연구대상은 국내 K 대학교 학군단 후보생으로 애니메이션 심폐소생술군과 변형된 포켓 심폐소생술군 사이에 심폐소생술의 수행도와 정확도 차이를 2010년 미국심장협회 지침에 따라 평가하였다. 자료수집은 2012년 5월 19일부터 20일까지 실시되었다. 연구결과 애니메이션 심폐소생술군과 변형된 포켓 심폐소생술군 사이에 유의한 차이가 없는 것으로 나타났다. 그러나 두 군 모두 심폐소생술 교육 전보다 후에 향상된 수행도를 보였다. 또한, 변형된 포켓 심폐소생술군은 가슴압박 중 깊이 정확도에서 (26.4%, p<.05), 애니메이션 심폐소생술군은 가슴압박 중 위치 정확도에서 교육 후 유의하게 증가하였다(25.2%, p<.01). 따라서 스마트폰 앱에 의한 심폐소생술 교육을 적시적소에 활용하되, 애니메이션 앱과 포켓심폐소생술 앱의 장점을 활용하고 단점을 보완한 교육을 하면 일반인이 쉽게 접근할 수 있는 심폐소생술 교육을 실시하는데 기여할 수 있을 것으로 사료된다.