• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.5
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• pp.152-159
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• 2016

This paper describes an offset and 1/f noise cancellation technique based hall sensor signal processor. The hall sensor outputs a hall voltage from the input magnetic field, which direction is orthogonal to hall plate. The two major elements to complete the hall sensor operation are: the one is a hall sensor to generate hall voltage from input magentic field, and the other one is a hall signal process system to cancel the offset and 1/f noise of hall signal. The proposed hall sensor splits the hall signal and unwanted signals(i.e. offset and 1/f noise) using a spinning current biasing technique and chopper stabilizer. The hall signal converted to 100 kHz and unwanted signals stay around DC frequency pass through chopper stabilizer. The unwanted signals are bloked by highpass filter which, 60 kHz cut off freqyency. Therefore only pure hall signal is enter the ADC(analog to dogital converter) for digitalize. The hall signal and unwanted signal at the output of an amplifer and highpass filter, which increase the power level of hall signal and cancel the unwanted signals are -53.9 dBm @ 100 kHz and -101.3 dBm @ 10 kHz. The ADC output of hall sensor signal process system has -5.0 dBm hall signal at 100 kHz frequency and -55.0 dBm unwanted signals at 10 kHz frequency.

• Korean Journal of Materials Research
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• v.4 no.1
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• pp.113-116
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• 1994

InSb thin film magnetic sensor, which have been prepared on glass substrate by vacuum evaporation, is investigated in this paper. The dependance of Hall voltage on magnetic field and temperature is examined by Hall effect. The variation of Hall voltage with magnetic field is almost linear at constant current drive but it is deviated from the linearity at constant voltage drive. Hall voltage decreases as the ambient temperature increases, so it is necessary to take into account the temperature effect when the InSb thin film is used as magnetic sensor.

• Journal of architectural history
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• v.27 no.2
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• pp.79-88
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• 2018

Foreign Reception Hall in Gyeongungung Palace was constructed during 1899-1902 according to Yesigjangjeong (禮式章程), Korean Empire's modern diplomatic protocol. This bulilding is a case worthy of notice, because its construction process was written in Jubon(奏本), Korean Empire's official document. Yesigjangjeong(禮式章程) regulates the process of diplomat's audience with Emperor Gojong. The process suggested that Foreign Reception Hall was designed as the place of the end as well as the beginning for audience. According to the process, diplomat came through main gate, Daehanmun and outer gate of main hall(Junghwajeon Hall, Audience Hall), then arrived at the stair to Foreign Reception Hall. After waiting time in the hall, he was going to be granted an audience with Emperor. And he exited through Foreign Reception Hall as the reverse way. This hall was constructed as western-style. Subcontracted carpenters and wood sculptors and laborers from China represents that chinese workers were prevailed in the government construction at that time. And modern building materials, such as glass, colored brick, sanitary wares and lightings were applied, which showed the new landscape in the middle of Gyeongungung Palace. Above all, official documents related with this hall reveals Korean Empire supervised this construction for diplomatic protocol. That is the identity of western-style buildings in Gyeongungung Palace.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2006.11a
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• pp.197-198
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• 2006

The latest university makes the use of exhibition hall bring into relief a specific character and identity. This purpose of this design is to induce interest the exhibition plan, that is useful to appreciation of audience according to space structure. The concept of this design is to design continual circulation plan and to give correctness Information of the exhibit. Because to this exhibition hall is too small space, this design focus is continual circulation plan. The exhibit is classified to according to the character of that, which is distinguished according to the colour plan. The center of the hall is main image hall of university. The right space of the main hail is university history exhibition hall and the left space of the hall is a founder memorial hall. The main colour is light cream. An image object colour plan is point colou, which is bluish green colour.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.11
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• pp.1894-1899
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• 2016

In this paper, because the position sensor represents the important factor in BLDC (Brushless DC) motor drives, BLDC motor is necessary that the three Hall-sensors evenly be distributed around the stator circumference in case of the 3 phase motor. The Hall-sensor is set up in this motor to detect the main flux from the rotor. So the output signal from Hall-sensor is used to drive IGBT to control the stator winding current. However, in case of breakdown Hall sensor, we research that the estimation algorithm of Hall sensor signal to detect rotor position and for the speed feedback signals with BLDC motor whose six stator and two rotor designed. In addition, this paper presents a sensorless speed control of BLDC Motor using terminal voltage of the one phase. Rotor position information is extracted by indirectly sensing the back EMF from only one of the three terminal voltages for a three-phase BLDC motor.

• Korean Institute of Interior Design Journal
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• v.18 no.5
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• pp.89-100
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• 2009

Stage lighting system is very important in theater. Because basic of performing art. Recently, The stage lighting system is very close with a performing arts. The performance arts is to have an easy communication between actors and audience. All activities related to performance art take place between the stage light and auditorium. Therefore, when constructing theater the best conditions of the stage light system should be considered for the smooth progress of play. It will be method of solution that basically facility in the performance art hall. The results of this study can be used for suggesting an operation and system improvement for stage lighting system in performance art hall. Recently, changes in the progress of plays have required the perfect stage light system. As a result, performance art hall are the most advanced stage lighting system technology of changed. The following procedures were taken for this research-the literature on the development of stage lighting system and equipment, structure, and the dimmer and computer console system has been reviewed theoretically Most of all, Cheonan City Hall Bongseo Hall and CMB EXPO art hall is important a sample of lighting system. The result of this study presents operation and system improvement stage lighting system in theater, below to operation and system improvement at stage lighting system local self-government corporation performance art hall are inconsistent stage.

• 전기의세계
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• v.25 no.4
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• pp.53-58
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• 1976

Criteria and significance of the factor .root..mu..$R_{u}$ or ($R_{u}$/.root.p) in Hall element material selection are discussed. And the chart which is useful to compare the figure of merit F=.root..mu..$R_{u}$ in Hall element materials is presented with the F's for some practical Hall device materials.als.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.2
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• pp.109-116
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• 2005

The high performance drives of the slotless Permanent Magnet Brushless DC(PM BLDC) motor can be achieved by the current control, where the currents flow according to the rotor position and the current phase is suitably controlled according to the operational condition. Rotor position information can be provided by Hall-IC or sensorless algorithm. So, the Hall-ICs are set up in this motor to detect the main flux from the rotor. Instead of using three Hall-ICs and encoder, this paper uses only two Hall-ICs for the permanent magnet rotor position and the speed feedback signals, and uses a micro-controller of 16-bit type (80C196KC). Also because of low resolution obtained by using Hall-IC even low-cost and simple structure, to improve the wide range of speed response characteristic more exactly, we propose the rotor position signal synthesizer using PLL circuit based on two Hall-ICs.

• The Journal of the Acoustical Society of Korea
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• v.24 no.2
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• pp.111-116
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• 2005

This study deals with a subjective assessment to investigate the preferred acoustic conditions and determine the important acoustical parameters in concert halls. A subjective test was carried out using dummy head recorded sounds made in actual halls in Australia (referred to as Hall A and Hall B) to evaluate the acoustic performance of two halls. The results of subjective tests were then correlated with measured acoustical parameters to investigate the significant determinants for the preference judgements. The listeners show a stronger Preference for seats in the Hall B than those in the Hall A. The low preferences for seats in the Hall A are in agreement with live performance ratings assessed by musicians. It is found that the sound level is the most significant acoustical parameter for evaluating the overall acoustic preference in the two halls.

• The Transactions of the Korean Institute of Power Electronics
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• v.18 no.3
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• pp.205-210
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• 2013

This paper presents a novel hall sensor fault detection and fault-tolerant control method for a high-speed permanent magnet synchronous motor (PMSM) drive system. A phase locked loop (PLL) type position estimator is used with a conventional interpolation based rotor position estimator to reduce position errors due to misalignment of hall sensors. The expected trigger time of hall sensor's output is used for detecting hall sensor fault condition and the PLL type position estimator is reconfigured for fault-tolerant control at the hall sensor fault condition. The proposed method can minimize current ripples during the transition from sensored control using hall sensors to sensorless control. Experimental results have been proposed to prove the validity of the proposed method.