• Journal of Platform Technology
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• v.6 no.1
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• pp.3-8
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• 2018

This paper proposes a technique for recognizing online handwritten cursive data obtained by tracing a motion trajectory while a user is in the 3D space based on a convolution neural network (CNN) algorithm. There is a difficulty in recognizing the virtual character input by the user in the 3D space because it includes both the character stroke and the movement stroke. In this paper, we divide syllable into consonant and vowel units by using labeling technique in addition to the result of localizing letter stroke and movement stroke in the previous study. The coordinate information of the separated consonants and vowels are converted into image data, and Korean handwriting recognition was performed using a convolutional neural network. After learning the neural network using 1,680 syllables written by five hand writers, the accuracy is calculated by using the new hand writers who did not participate in the writing of training data. The accuracy of phoneme-based recognition is 98.9% based on convolutional neural network. The proposed method has the advantage of drastically reducing learning data compared to syllable-based learning.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.5 no.3
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• pp.3-13
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• 1994

In the environments with interference and Rayleigh fading the bit error probability equation of FH / MFSK signal has been derived and the error rate has been evaluated. And the results are shown in graphs and discussed. The degree of improvement of error rate performance has been found out in space diversity technique. From the results, we know that maximal ratio combining is very effective for Rayleigh fading and interference.

• Journal of the Korean Institute of Gas
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• v.13 no.3
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• pp.43-48
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• 2009

The energetic and environmental problems have been getting serious after the revolution of modern industry. Therefore, demand of gas as an eco-friendly energy source is increasing. With the demand of gas, the use of gas is also increased, so injury and loss of life by the fire have been increasing every year. Hence the influence on flame caused by Vapor Cloud Explosion in enclosure of experimental booth was calculated by using the API regulations. And the accident damage was estimated by applying the influence on the adjacent structures and people into the PROBIT model. According to the probit analysis, the spot which is 5meter away from the flame has nearly 100% of the damage probability by the first-degree burn, 27.8% of the damage probability by the second-degree burn and 14.5% of the death probability by the fire.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1264-1265
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• 2008

PLD 방법으로 undoped ZnO박막을 성장 온도별로 성장하여 박막의 광학적 특성이 변화되는 것을 관찰하였다. undoped ZnO박막은 $Al_2O_3(0001)$기판을 이용하였고, pulsed laser deposition(PLD)을 이용하여 증착을 하였다. 이때 파장이 355nm인 Nd:YAG 레이저를 이용하였고 레이저의 에너지 밀도는 1.4 $J/cm^2$ 이었다. 구조적 광학적 특성을 관측하기 위하여 XRD, SEM, PL 등을 측정하였다. PL 측정 결과 성장 온도가 증가함에 따라 undoped ZnO박막의 광학적 특성이 좋아지는 것을 관찰할 수 있었다. XRD 측정 결과도 온도별 FWHM과 intensity ratio가 점차 좋아지는 것을 볼 수 있었다.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.548-553
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• 2008

Low Floor buses have no steps to get on or get off the main cabin to provide the old and the handicapped with easy access. The car body for the low floor bus was designed to consider Korean physical standard, passenger capacity (standee, seated, handicapped), arrangement of vehicle components, and bus law or regulations. It was designed as an one body, without any reinforcement armature, which has light-weight sandwich constructions with glass epoxy skins, aluminum honeycomb cores and inner-frames. In this paper, torsion rigidity of the designed car body was evaluated and compared with that of a car body with reinforcement armatures in the cabin. Finite element method verified that the designed car body without reinforcement armatures could satisfy requirements of torsion rigidity.

• Journal of the Korean Operations Research and Management Science Society
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• v.37 no.4
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• pp.125-138
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• 2012

Health care that is considered to be one of the major factors for the quality of life is nowadays receiving a great deal of attention, and thus there is a growing need in Korea to identify the efficiency of national medical service and enhance the competitiveness. Although there exist studies on the medical service efficiency about general hospitals and local hospitals, they mostly deal with the efficiency problems from a domestic and regional perspective. In response, this paper analyzes the competitive efficiency of national medical service with respect to 16 OECD countries, by exploiting Data Envelopment Analysis (DEA) and Malmquist Productivity Index (MPI). Building on the DEA and MPI analysis results, this paper identifies the competitive position of Korean national medical service and suggests implications for the medical service improvement.

• Journal of the Korean Mathematical Society
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• v.47 no.1
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• pp.165-187
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• 2010

We introduce two numerical schemes for solving a system of ordinary differential equations which characterizes several kinds of linear reactions and diffusion from biochemistry, physiology, etc. The methods consist of sequential applications of the simple exact solver for a reversible reaction. We prove absolute stability and convergence of the proposed explicit methods. One is of first order and the other is of second order. Numerical results are included.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.37
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• pp.41.1-41.6
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• 2015

Cleidocranial dysplasia is an autosomal dominant heritable skeletal disorder. The characteristic features of cleidocranial dysplasia (CCD) may include hypoplasia of the clavicle, delayed closure of frontanelles, late tooth eruption, and other skeletal disorders. This case report describes clinical and radiographic manifestations at the age of 11 and 29 of a CCD patient, investigates the mutation of core-binding factor A1 (CBFA1) based on gene analysis, and illustrates successful oral reconstruction with fixed prosthesis and dental implant after the extraction of multiple teeth.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04b
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• pp.1189-1192
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• 2001

향후 인터넷은 이동 환경하에서 메일, 파일 전송 등의 비실시간 응용 뿐만 아니라 음성, 비디오, 인터넷 방송 등의 실시간 응용 서비스를 이용하려는 욕구가 증가할 것으로 예상되며, 이를 위해 광대역 서비스 뿐만 아니라 사용자별 차별화된 QoS의 보장이 요구된다. 본 논문에서는 전송속도 및 대역폭 할당의 개선을 위해 WDM 전송망을 백본망으로 하는 이동 인터넷망에서의 QoS 제공 방안을 제시한다. 우선 WDM 전송망을 기반으로 하는 이동 인터넷망의 모델을 제시하고, 트래픽의 특성 및 QoS 파라메타를 분석한 다음, QoS 제공 방안을 제안하고, QoS제어를 위한 프로토콜 구조 및 각 계층별 기능을 설명한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.1007-1010
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• 2003

Efficient using of web cache is becoming important factor that decide system management efficiency in web-Based system. Cache performance depends heavily on replacement algorithms, which dynamically select a suitable subset of objects for caching in a finite space. However, replacement algorithm on web cache has many differences than traditional replacement algorithm. In this paper, a web-caching algorithm is proposed for efficient operation of web base system. The algorithm is designed based on a divided scope that considered size reference characteristic and heterogeneity on web object. The performance of the algorithm is analyzed with an experiment. With the experiment results, the algorithm is compared with previous replacement algorithms, and its performance is confirmed ith an improvement of response speed.