• The Journal of the Acoustical Society of Korea
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• 제25권3E호
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• pp.95-100
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• 2006

The present study presents the design procedures and the acoustic properties of the main hall of Ansan Cultural Arts Center in Korea which has opened in 2004. The acoustic design values are compared with the measured acoustic properties of the completed multi-purpose hall. Acoustic design criteria were suggested in the design stage through the 3-dimentional computer simulations. The acoustic parameters including SPL, RT, C80, $D_{50}$M, RASTI were measured in the hall after completed. Acoustic measurements were carried out in the 40 measurement points using MLS sound source signal in 4 different sound source points. The results show the even distribution of sound levels within the 2.0dB of difference among all seats. The reverberation time of 1.66sec was measured which is similar to the objective value of 1.65 sec in empty states. It was also found that average C80 values lie in the objective extents of C80 from -1 to 3dB and average D50 value of 54 was measured. Thus, it is concluded that the hall can be used as a multi-purpose hall with a suitable acoustic conditions.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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• pp.113-114
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• 2008

Conventional furnace annealing (CFA) for activating Mg-doped p-type GaN films had been performed in pure $N_2$ ambient. All sample activated the same gas ambient. The annealing process change temperature: the first process is performed at $550^{\circ}C$ for 10 min. but, the first process is the same bulk. From second to five process increase activation temperature to change $50^{\circ}C$ and annealing time keeping for 10 min. It is found that the samples characteristic measure hall measurement. Similar results were also evidenced by photoluminescence (PL) measurement.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.623-627
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• 2007

In case of the Grand Performance Hall, in view of its distinctiveness, since various Assembly Activity as well as Lecture together with the use for Music are important besides the purpose of Performance itself, the consideration with regard to the sound environment which enables to minimize the acoustic defect has appeared on the stage as an essential factor. On this viewpoint, this Study has attempted to examine the acoustic satisfaction degree and its response regarding to the grand performance hall by means of the measurement and valuation about the psychological volume of human-being using the auditory-evoked technology that possible to experience the Virtual Sound Field at the designing stage, after practice of the optimized acoustic design for the object of the grand performance hall on the step of construction. As the result of auditory-evocation, it was known that the valuation about the acoustic performance after reformation has been improved affirmatively than before reformation. It is considered that such outcome of the study could be utilized as the useful material that enables to improve the curtailment effect of construction cost and the acoustic performance, by means of the presupposition control about the acoustic problem from the stage of design, for the occasion when the similar Performance Hall is planning to build, hereafter.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2000년도 춘계학술대회논문집
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• pp.913-920
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• 2000

The hall and the projection room of the multiplex cinema being constructed on the sixth and seventh floors at Jeonpo-dong market, Pusan, is composed of structural beams and decks considering the structures self weight problem, and the following problems are expected: - Vibration and noise generated on the floors by moving audiences may annoy the audiences in the other hall - Vibration and noise generate on the floor of the nearby hall as the audiences walk through the alley near the projection room - Vibration and noise generate on the floor of the hall nearby the projection room as the film drops This study measured and reviewed the vibration amount of the seven representative transferring routes that were selected for the halls and the alley near the projection room. Based on the analysis, the model hall was constructed and the vibration in the hall was estimated after cutting the deck. Also, this study constructed the steel stairs and investigated the vibration transferring characteristics to decide whether to construct the steel stairs in the building. Finally, the results were evaluated by actually using the stairs and reviewed the appropriateness of the measurement.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2004년도 추계학술대회 논문집
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• pp.349-354
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• 2004

In accordance with recent culture-advancement and national improvement in conscious level, the desire for cultural life is on increasing, so that it is also increasing tendency toward the planning and construction of large performance hall for the local residents, conducted by the provincial self-governing body. For the sake of a satisfiable acoustic efficiency at the said large performance hall, although it is designed and constructed with application of various methods of simulation from the planning stage, there could be appeared an error of the said simulation and defect occurred in the construction, and due to such reason, a situation unable to fulfill a satisfiable Acoustic efficiency to be generated thereat after opening of the hall. Accordingly, it is able to judge on the part which necessitates for betterment, also the region where acoustically weak, through measurement and evaluation on the acoustic efficiency in the completed performance all, and by its correction as well as supplement thereon based on the afore-mentioned, a performance hall equipped with the supreme acoustic condition could be established.

• 한국초전도ㆍ저온공학회논문지
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• 제21권4호
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• pp.48-52
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• 2019

Recently, many studies have been reported on the magnetoresistance and Hall effect of REBCO thin films and bulk. The voltage interferes quench detection of high-temperature superconducting magnet and generates leakage current in no insulation high-temperature superconducting coil. Therefore, in this paper, experiments on magnetoresistance and Hall effect of commercial YBCO and GdBCO tapes have been carried out. As a result, anomalous voltages expected for the magnetoresistance and Hall effect of REBCO tapes were observed and analyzed. In addition, the voltage characteristics of REBCO have been identified, and the Hall coefficient are calculated for use in high magnetic field magnet applications.

• Progress in Superconductivity
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• 제11권2호
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• pp.128-134
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• 2010

The magnetic flux profiles in SmBCO and YBCO coated conductors(CC) in the presence of the external field were comparatively investigated by magneto-optic image and scanning hall probe measurements. The current distributions calculated by using the inversion method from measured field profiles show that the decrease of current densities near the edges of SmBCO CC is more significant than those of YBCO CC. Through the comparison of the numerical analysis based on Kim's critical state model and the Brandt and Indenbom's solution, we found that this feature is related to their different field dependant properties of the critical current densities.

• 한국전기전자재료학회논문지
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• 제13권1호
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• pp.1-5
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• 2000

Optical and electrical properties of GaSe:Er\ulcorner single crystals grown by the Bridgenman technique have been investigated by using optical absorption and h\Hall-effect measurement system. The Hall coefficients were mea-sured by using a high impedance electrometer in the temperature range from 360K to 150K. The temperature dependence of hole concentration show the characteristic of a partially compensated p-type semiconductor. Carrier density(N\ulcorner) of GaSe doped with Erbium was measured about 3.25$\times$10\ulcorner [cm\ulcorner] at temperature 300K, which was higher than undoped specimen. Photon energy gap (E\ulcorner) of GaSe:Er\ulcorner specimen was measured about 1.79eV.

• Journal of Magnetics
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• 제14권3호
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• pp.132-136
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• 2009

This study investigated the radial pulse waveform obtained by a medical pulsimeter sensor. A pulse-sensing part array consisting of multiple Hall devices was located over a skin-contacting part with a hard magnetic material. The periodic movement of the magnetic material of the skin-contacting part affected the magnetic field in the pulse-sensing part array and was detected by multiple Hall devices. The analysis of a radial pulse waveform that is measured noninvasively by detecting the changes of the magnetic field can be used to develop a new diagnostic algorithm of oriental medical apparatus.

• 마이크로전자및패키징학회지
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• 제21권4호
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• pp.41-44
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• 2014

본 연구에서는 $TiO_2$에 나이오븀 (Nb) 도펀트가 주입되었을 때의 활성화 에너지를 홀 효과 측정 시스템과 온도에 따른 photoluminescence (PL) 실험을 통하여 살펴보았다. Nb 이 도핑 된 n형 아나타제 $TiO_2$ 박막은 pulsed laser deposition (PLD) 기법으로 $SrTiO_3$기판에 성장되었다. 측정 결과, Nb 도너의 활성화 에너지 값은 홀 효과 측정에서는 14.52 meV, PL 측정에서는 6.72 meV로 다소 차이를 보였다. 이 결과는 기존의 어셉터 물질의 활성화 에너지들과는 차이를 나타내고 있으며, 향후 본 연구와 같은 shallow 도너 준위의 활성화 에너지 연구에 대한 더 많은 연구가 필요할 것으로 판단된다.