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박완서(Park, Wan-Seo),김영욱(Kim, Young-Ook) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.10
The commercial area of Seoul was formed as the linear on the streets from Jong-ro to Namdaemun-ro in the late of Chosun Dinasty. And it was revealed that it resulted from marketing system centered on the city and consumers" purchasing behavior through peddlers. In the Korean Empire Period after the opening port, because there still remained the marketing system centered on wholesale and consumers" purchasing behavior though foreign trade-people came into Seoul and especially Japanese commercial area expanded the whole area of Chungmu-ro and up to Namdaemun-ro, we can see that in this period the commercial area was informed as linear form on the city structure. But the re-establishment of Spatial Configuration of southwest-ro centered on Deoksu Palace made Namdaemun-ro more important area. And we can see that Japanese went to Namdaemun-ro because of its political, economical value. Though the commercial area which formed grid pattern of city structure in the Japanese occupation time was widespread with density on the main roads after Chosun Dynasty was annexed by Japan and through the city improvements, the commercial area became to expand to whole city areas. We can analyze that such change resulted from the expanding of the locational benefit of marketing system because of the formed grid pattern of city structure and growing retail trading, and that the distribution of shops was related to the number of Metric Angular Choice because of the improvement of regional approach. As a result, if we can interpret the change of commercial areas in the modern times with Spatial Configuration, linear commercial area on the city structure continued until the late of Chosun dynasty and then commercial area was expanding to whole city because of the grid pattern of Seoul city structure. This means that the commercial area formed in the city structure which Segment Angular Choice shows was changing regional center Metric Angular Choice shows. We can see that such change was due to the change of commercial areas and consumers" purchasing behavior. And it showed that Spatial Configuration of Seoul was related to the change of commercial area.
영구자석 동기전동기의 확장 역기전력 기반 센서리스 제어와 자속기반 센서리스 제어의 파라미터 오차의 영향 분석
박완서(Wan-Seo Park),조관열(Kwan-Yuhl Cho),김학원(Hag-Wone Kim) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.3
영구자석 동기전동기는 벡터제어를 통해 우수한 효율로 다양한 산업분야에 적용되고 있다. 영구자석 동기전동기의 벡터제어를 위한 회전자 위치정보는 회전자 위치센서 또는 회전자 위치 추정기를 이용하여 검출한다. 회전자 위치추정기를 이용한 센서리스 제어로 가장 많이 적용되고 있는 모델기반 센서리스 제어는 역기전력기반의 센서리스 제어와 영구자석의 자속기반 센서리스 제어로 구분할 수 있다. 역기전력 기반의 센서리스 제어는 역기전력이 속도에 비례하므로 저속에서 회전자의 위치 추정성능이 떨어지는 단점이 있다. 자속기반 센서리스 제어의 경우 회전자 위치추정을 위한 영구자석의 자속의 크기는 속도에 관계없이 일정하기 때문에 넓은 속도 영역에서 회전자의 위치 추정성능이 우수하다. 하지만 모델기반 센서리스 제어는 영구자석 동기전동기의 수학적 모델을 이용하기 때문에 전동기 상수의 변화에 따라 회전자 위치 추정 성능이 영향을 받는다. 본 논문에서는 두 가지 모델기반 센서리스 제어 방법에 대해 고정자 저항 및 인덕턴스의 전동기 상수 오차가 –30% ~ 30%로 변동하였을 때 역기전력 추정 성능, 자속 추정 성능, 회전자의 위치추정 성능을 이론적으로 비교, 분석하고 모의해석 및 실험으로 검증하였다. The PM synchronous motor drives with vector control have been applied to wide fields of industry applications due to its high efficiency. The rotor position information for vector control of a PM synchronous motor is detected from the rotor position sensors or rotor position estimators. The sensorless control based on the mathematical model of PM synchronous motor is generally used and it can be classified into back EMF –based sensorless control and magnet flux-based sensorless control. The rotor position estimating performance of the back EMF-based sensorless control is deteriorated at low speeds since the magnitude of back EMF is proportional to the motor speed. The magnitude of the magnet flux for estimating rotor position in the flux-based sensorless control is independent on the motor speed so that the estimating performance is excellent for wide speed ranges. However, the estimation performance of the model-based sensorless control may be influenced by the motor parameter variation since the rotor position estimator uses the mathematical model of the PM synchronous motor. In this paper, the rotor position estimation performance for the back EMF based- and flux-based sensorless controls is analyzed theoretically and is compared through the simulation and experiment when the motor parameters including stator resistance and inductance are varied.
노병돈,박완서,Ro. Byung-Don,Park. Wan-Seo 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
Usually, cut-slope is the term that call rock slope. Therefore, the cause of instability of cut-slope is influenced generally in lithological and structure geological qualities including weathering disintegration. Through the several case studies, we could confirm that stabilization countermeasure also should be based in geological properties.