• Speech Sciences
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• v.8 no.4
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• pp.131-138
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• 2001

Sound pressure level, subglottic air pressure, vital capacity, adduction/abduction rate, and phonatory efficiency were measured in 19 opera singers, 17 Korean traditional 'Pansori' singers, and 20 non-singers; subjects' mean age was 25.9(SD=7.2) and the singers had been singing professionally for 5-10 years. One-way ANOVA and Scheff$\w'{e}$ post-hoc analysis were used to analyze aerodynamic data and to identify significant differences among groups. Sound pressure level, peak subglottic air pressure, and phonatory efficiency were found to be significantly different among three groups of the subjects. Differences in aerodynamic properties were discussed for their significance in diagnosis and treatment of voice disorders in professional singers.

• Journal of Magnetics
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• v.3 no.3
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• pp.69-73
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• 1998

A drum type magnetic separator was designed and optimized by computer simulation. The separator consisted of rotating outer shell of drum, magnetic flux generator drum which was assembled with numbers of disk type magnet holders, and drum axis around which the magnet holders were fixed. NdFeB magnet blocks were inserted into the disks, and the disks were assembled layer by layer along the drum axis. Magnetic circuits of the separator were simulated on the basis of highest magnetic strength, least cost, and high yield of separation by using a Vector Field S/W employing the Opera-2D program. The separator proved a separation yield of 95% in removing fine iron-base particles, and installed at Hot Rolling Mill of Pohang Iron & Steel Co. In Korea.

• The Journal of the Acoustical Society of Korea
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• v.3 no.2
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• pp.3-12
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• 1984

This paper is to suggest the optimum structure and the rating scale of PANSORI hall. The method of this study is as follows. 1. Consideration for the characteristics of OPANSORI and Beranek's music & acoustic theory. 2. To take advice from the expert. 3. The experiment and evaluation of a model. 4. The structure of PANSORI hall and the study of the availability in Beranek's rating scale of orchestra and opera. 5. The establishment of the rating scale in PANSORI hall. 6. The evaluation of the forms of performance in each hall. The result of this study, the proper hall in the performance of PANSORI is, 1. The initial time delay gap less than 25ms. 2. The reverberation time of the extents of 1.2 seconds. 3. The proper average bass ratio of 1.25 extents. 4. The distance from performers to audience is within 30 meters. 5. THE VOLUME OF HALL IS 450-7400 ㎥ extents. 6. It should be designed not to be a acoustical disturbancenoise, echo, and the unbalance of sound pressure level, etc.

• 한국정보통신설비학회:학술대회논문집
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• 2008.08a
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• pp.509-512
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• 2008

본 논문에서는 원전 증기발생기세관 진단을 위한 와전류탐상의 전자기 수치해석을 수행하였다. 전자기적 특성을 해석하기 위하여 맥스웰 방정식을 이용하여 지배방정식을 유도하였고, 3차원 전자기 유한요소 프로그램인 OPERA 3D를 이용하여 전자기 수치 해석을 수행하였다. 신호해석을 위해 사용된 프로브의 종류는 배열와전류프로브이며, FBH 결함의 신호를 해석하였다. 결함의 깊이는 세관 두께의 40[%], 60[%] 및 100[%]로 하였다. 시험주파수는 100[kHz], 300[kHz], 400[kHz]를 사용하였고, 각각의 결함 및 시험주파수에 대한 결과를 비교 분석하였다. 본 논문의 결과는 앞으로 배열와전류프로브를 이용하여 원전 증기발생기세관 진단을 할 경우 신호 해석에 도움이 될 것으로 사료된다.

• Korean Institute of Interior Design Journal
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• v.15 no.1 s.54
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• pp.113-120
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• 2006

This study analyzes the space composition and the construction system of performance facilities, and research the area construction ratio of each necessary space to establish the specialized performance facilities. This study aims the exclusive facilities for opera among the various performance facilities at home and abroad. The results are as following, 1) Performance space is divided into Public space, Performance space and Administration space on the basis of user. 2) The difference in the scale of performance facilities depends on the fractionation of performance supporting facilities and the grade of specialty rather than the number of seats. 3) The scale and zoning of space in the performance facilities to be built in the future, it is necessary to consider ensuring the production support space, the organic connection of support space and the integrated public space.

• Proceedings of the KIEE Conference
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• 2005.10c
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• pp.104-106
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• 2005

In this paper, 3-dimensional magnetic field of coil is analyzed by using biot-sarvart law considering singularity. The RMSP(reduced magnetic scalar potential) arc employed in order to reduce the number of unknown variables in FEM(Finte Element Analysis) or BEM(Boundary Element Method). It Is necessary to calculate magnetic field of souce current when RMSP is used. Biot-savart law is generally used. it is difficult to calculate the field when the source point is in inside the coil. To integrate using gaussian quadrature, the cross section of coil is divided considering the position of field point when field point is inside coil. The proposed method shows good agreement of magnetic field compared with FEMLAB, OPERA3D.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1243-1245
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• 2005

신뢰성 있는 초전도전력 케이블의 설계를 위하여 초전도 케이블 각층의 인덕턴스 산정방법을 기존 방법과 새로 제안된 방법을 비교하였으며, 새로 제안된 방법에 의한 인덕턴스 계산을 검증하기 위하여 상용전자장해석 프로그램을 이용하여 그 계산결과를 비교하였다. 기존의 초전도 전력케이블의 인덕턴스 산정방식인 Go and Return Method 및 Energy Method에 대한 전자기적 타당성을 재검토하였으며, 더 나아가 Newman Method와 Geometric Mean Distance를 결합한 Neumann-GMD Method를 제안하였다. 각 방법의 신뢰성 검증을 위하여 상업적으로 검증된 전자장 해석 tool인 OPERA를 이용하여 특정 피치에 대한 2층 구조의 케이블을 모델링하고 그 인덕턴스를 계산하여, 각 방법에 의하여 계산된 인덕턴스 값과 비교하였다. 이 과정을 통하여 가장 신뢰성 있는 인덕턴스 계산법을 선택하여 초전도 전력 케이블의 설계에 적용하고자 한다.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1246-1248
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• 2005

초전도 전력케이블 시스템은 일반적으로 다음과 같은 전자기적 구조를 가지게 된다. 먼저, 여러 층으로 이루어진 전력 전송을 위한 초전도 코어, 초전도 코어 고장시 전송전류를 바이패스 시키는 stabilizer 그리고 최외각의 질소 및 진공을 위한 2층의 cryostat으로 이루어진다. 본 논문에서는 초전도 전력케이블이 정상적으로 운행될 때 내부 stabilizer 및 외부 질소조와 진공조에서 발생하는 와전류 손실을 상용전자장 해석프로그램인 opera 3d를 이용하여 모델링한 후, 각 부분에서의 와전류 손실을 도출하여 초전도전력케이블 시스템의 설계시 stabilizer와 외부 질소조 및 진공조의 제작에 그 결과를 응용하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.735-738
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• 2011

회원가입 정보를 이용하는 대다수의 웹 어플리케이션은 쿠키 및 세션을 이용한 인증기법으로 로그인 인증을 한다. 그러나, 쿠키에 의존하여 로그인 인증을 하는 웹 어플리케이션은 재전송 공격(Replay Attack)에 취약하다. 재전송 공격이란 사용자가 로그인할 때 쿠키의 정보를 해커가 스니핑(Sniffing)하여 Opera 웹브라우저의 쿠키 관리자에서 강제로 재전송하여 위장할 수 있는 공격을 말한다. 본 논문에서는 쿠키와 세션 인증키를 이용하여 재전송 공격을 방어할 수 있는 알고리즘을 제안하였다. 그리고, 클라이언트와 서버간에 신뢰할 수 없는 통신으로 인한 스니핑의 문제점을 서버에만 저장된 암호화된 세션 인증키로 개선하였다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2000.04a
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• pp.113-119
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• 2000

The Pansori is a Korean traditional vocal music that has a unique story and melody which converts deep emotion into art. It has both verbal and emotional components. which can be coordinated by large-scale neural network. The purpose of this study is to illustrate the cortical network activated by a Korean traditional opera, Pansori, with different emotional valence using functional MRI (fMRI).Nine right-handed volunteers participated. Their mean age was 25.3 and the mean modified Edinburgh score was +90.1. Activation tasks were designed for the subjects to passively listen to the two parts of Pansories with sad or hilarious emotional valence. White noise was introduced during the control periods. Imaging was conducted on a 1.5T Siemens Vision Vision scanner. Single-shot echoplanar fMRI scans (TR/TE 3840/40 ms, flip angle 90, FOV 220, 64 x 64 matrix, 6mm thickness) were acquired in 20 contiguous slices. Imaging data were motion-corrected, coregistered, normalized, and smoothed using SPM-96 software.Bilateral posterior temporal regions were activated in both of Pansori tasks, but different asymmetry between the tasks was found. The Pansori with sad emotion showed more activation in the light superior temporal regions as well as the right inferior frontal and the orbitofrontal areas than in the right superior temporal regions as well as the right inferior frontal and the orbitofrontal areas than in the left side. In the Pansori with hilarious emotion, there was a remarkable activation in the left hemisphere especially at the posterior temporal and the temporooccipital regions as well as in the left inferior and the prefrontal areas. After subtraction between two tasks, the sad Pansori showed more activation in the right temporoparietal and the orbitofrontal areas, in contrast, the one with hilarious emotion showed more activation in the left temporal and the prefrontal areas. These results suggested that different hemispheric asymmetry and cortical areas are subserved for the processing of different emotional valences carried by the Pansories.