• The korean journal of orthodontics
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• v.6 no.1
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• pp.25-32
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• 1976

The present study was performed to establish the cephalometric standards of Hellman dental age II C groups of Korean on the roentgenocephalometry. The subjects consisted of 26 males and 25 females with normal occlusion and acceptable profile. The major conclusions may be listed as follows: 1) The tables of standard deviation from the measurements were made. 2) All linear measurements of skeletal pattern in male were greater than in female with exception of the mandibular body length measurement. 3) The labial inclinations of the upper and lower incisors were greater in female than in male. 4) Vertical growth tendency of the face nab conformed in the late primary dentition as compared with the measurements of the mixed dentition.

• The korean journal of orthodontics
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• v.6 no.1
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• pp.39-46
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• 1976

This study was undertaken to establish the cephalometric standards, using lateral cephalometric roentgenograms of 48 male and 53 female Korean adults with normal occlusion and acceptable profile. By Cohen's method, measurement of depth was taken parallel to the FH plane and expressed as a percentage of the cranial base depth (BA-N). And vertical height was measured along the line perpendicular to the FH plane and expressed as a percentage of the anterior face height (N-M). The following conclusions were obtained: 1) Means and standard deviations of craniofacial proportions of Korean adults were tabulated. 2) Cranial babe depth of male was greater than that of female. 3) The proportionate depth of the middle face was greater in female than in male. 4) The proportionate total anterior face height was greater in male than in female. And it was greater in Korean than in the white.

• Proceedings of the Korean Society for Language and Information Conference
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• 2002.02a
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• pp.271-280
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• 2002

A system to assist call routing task for telephone operators at the Directorate General of Telecommunications (DGT) in Taiwan is reported in this paper. The system was developed based on DGT organization profile with description of its six divisions instead of a corpus of recorded and transcribed call-routing dialogs. An acoustic module and an information retrieval module were built specifically for this task. The construction of IR module was based on term extraction and thesaurus discovery processes. By integrating acoustic and IR module, the system achieves satisfactory performance and provides a promising approach to call routing. Simulation results indicated that the proposed algorithm outperforms standard classification methods. A working system based on the proposed approach has been implemented and experimental results are presented.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.12
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• pp.174-181
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• 1999

This paper describes the effect of the stylus tip size on the shape error in surface topography measurement. To analyze the distortional effect of an actual surface geometry origination from the finite stylus size, the surface is modeled as a sinusoid and the stylus tip as a circle. The magnitude of this distortion is defined as the ration of standard deviation, and this is expressed as an analytic function of the stylus tip radius and the geometrical parameter of a sinusoid. In this paper, the spectrum analysis of the profile is applied to investigate the distortional effect due to the mechanical filtering of the stylus in the frequency domain. and, the cumulative power spectrum is proposed to assess the shape error of measured data according to the various stylus tip sizes. From these results, a new method to select proper stylus tip radius is proposed.

• Journal of the Korean Society for Precision Engineering
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• v.14 no.5
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• pp.22-33
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• 1997

This paper describes a research work of developing a computer-aided design of blanking and piercing for stator and rotor parts. Based on knowledge-based rules, the die design system, STRTDES2, is designed by considering several factors, such as complexities of blank geometry and punch profile, and availability of press equipment and standard parts. Therefore this system can carry out a die design for each process which is obtained from the result of an automated process planning system, STRTDES1 and generate part drawing and the assembly drawing of die set in graphic forms. Knowledges for die layout are extracted from plasticity theories, relevant references and empirical know-hows of experts in blanking industries.

• Journal of information and communication convergence engineering
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• v.14 no.3
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• pp.163-170
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• 2016

Because of rapid technological advancements, increased data rate support has become the key criterion for future communication medium selection. Multimode optical fibers and multicore optical fibers are well matched to high data rate throughput requirements because of their tendency to support multiple modes through one core at a time, which results in higher data rates. Using the numerical mode solver OptiFiber, we have designed a concentric core fiber by investigating certain design parameters, namely core diameter (µm), wavelength (nm), and refractive index profile, and as a result, the number of channels, material losses, bending losses, polarization mode dispersion, and the effective nonlinear refractive index have been determined. Space division multiplexing is a promising future technology that uses few-mode fibers in parallel to form a multicore fiber. The experimental tests are conducted using the standard second window wavelength of 1,550 nm and simulated results are presented.

• Proceedings of the KSME Conference
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• 2007.05a
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• pp.1143-1148
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• 2007

LRE(Liquid propellant Rocket Engine) is one of the important parts to control the motion of rocket. For operation of rocket in error boundary of the set-up trajectory, it is necessarily to control the thrust of LRE according to the required thrust profile and control the mixture ratio of propellants fed into combustor for the constant mixture ratio. It is not easy to control thrust and mixture ratio of propellants since there are co-interferences among the components of LRE. In this study, the dynamic model of LRE was constructed and the dynamic characteristics were analyzed with control system as PID control and PID+Q-ILC(Iterative Learning Control with Quadratic Criterion) control. From the analysis, it could be observed that PID+Q-ILC control logic is more useful than standard PID control system for control of LRE.

• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.55.1-55.1
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• 2011

풍력터빈에 적용되는 제어로직에 대한 검증을 실험실 기반에서 검증하기 위해서는 바람 및 터빈에 대한 적절한 모델링이 선행되어야 한다. 특히 피치 및 토크제어에 대한 특성을 검증하기 위해서는 블레이드 공력특성 및 터빈의 동특성에 대한 반영이 필연적이다. 본 논문에서는 풍력터빈 적용 제어로직 검증을 위하여 대상터빈에 대한 스케일링 결과, 바람을 모사하기 위한 구동장치 동작 및 터빈 모사장치에 대한 설계 결과에 대하여 소개하도록 한다.

• Proceedings of the Korean Printing Society Conference
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• 2007.11a
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• pp.59-64
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• 2007

We have manufactured low-curable silver pastes for gravure printing out of roll to roll printing process. When printing, the pastes be used different silver powder shape because of the printing characteristics. The pastes were prepared with silver powder by silver powder shape, polyester resin, solvent and homogenized on a standard three-roller mill. And the pastes exhibited a shear-thinning flow at viscosity profile. Moreover the adhesive strength and resistivity of silver film had good characteristics. With the manufactured paste in this study, RFID antenna circuit had flexible is manufactured and it had $10^{-4}{\sim}10^{-5}{\Omega}{\cdot}cm$.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.470-473
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• 2015

본 논문에서는 MPEG 에서 현재 Type-1 동영상 표준을 위해 연구를 진행하고 있는 인터넷 비디오 코딩(Internet Video Coding, IVC)의 압축 성능에 대한 평가 방법 및 결과를 다룬다. 다년간의 연구로 IVC 의 성능은 매우 개선되어 왔으나, 산업이 원하는 수준에 도달했는지를 검증하기 위해서는 타 동영상 코덱과의 비교 평가 역시 필요하다. 이를 위하여, AVC/H.264 를 기반으로 Type-1 표준화를 진행해온 Web Video Coding(WebVC)의 인코더와 IVC Test Model 10.0 을 압축 성능 관점에서 객관적으로 비교 평가함으로써, IVC 의 부호화 성능의 뛰어남을 보이고자 한다. 또한, 상용화된 AVC/H.264 High Profile 과도 비교함으로써, IVC 의 객관적인 성능을 확인하고자 한다. 특별히, MPEG 내에서 결정한 시각적 비교 조건(Visual comparison condition)에 입각한 목표 비트율 및 양자화 변수 조건에 맞추어 평가한다.