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박종규(Jongkyu Park),문원규(Wonkyu Moon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Phenomenological models of a nonlinear piezo-ceramic actuator are introduced for compensating hysteresis. Piezoelectric ceramics are mainly used for precision actuation due to small resolution, fast response, and large force. In spite of these various advantages, PZT has several critical demerits such as hysteresis, creep and thermal drift. Specifically, hysteresis can cause serious displacement errors of about 15%, which prohibits the precise position control. To minimize the problem, we adopted Rayleigh law, one of the most typical phenomenological approaches. Rayleigh law corresponds well with experiment under less than coercive field. However Rayleigh law has also limitation to be unfit with experimental results as maximum fields increase until more than coercive field. Therefore, we have developed more accurate model to be able to reduce the hysteresis problem of an actuator through applying T(x) model using statistical mechanics.
박종규(Park, JongKyu) 중부고고학회 2021 고고학 Vol.20 No.2
이 글은 고려시대 지상건물지 유적에서 발굴조사된 구들 유구를 각 세기별로 정리·분석하여, 전면구들의 등장 과정을 살펴보는데 목적이 있다. 전면구들은 11~12세기 다양한 변화 과정을 거쳐 12세기 중·후반 무렵에는 초기적 형태가 나타난다. 용인 유운리 유적 4호 건물지, 강화 신봉리·장정리 유적, 울주 연자도 유적 11호 건물지에서 이러한 모습이 잘 나타나고 있다. 13세기 전반 용인 남사(아곡) 유적 5-마 지점 5호 건물지, 시흥 장현 유적 4지점 1호 건물지 단계가 되면 본격적으로 전면구들이 등장하는 것으로 확인되었다. 13세기 전·중반 평택 백봉리 유적 A-1, A-2호 건물지 단계 이후에는 전면구들이 완전히 정착된다. 이후 구들시설은 평면 형태에 구애받지 않고, 건물 내 필요에 의해 다양한 모습으로 나타난다. 전면구들의 등장에 앞서 12세기 전반에는 칸으로 독립된 마루방이 나타난다. 전면구들과 마루방의 등장은 입식생활에서 좌식생활로 주거 방식이 변화하는 요인이 된다. 전면구들이 전국적으로 확산되는 14세기 이후에는 효율적인 난방 기능 증대를 위한 다양한 기술적 변화들이 발생하는 것으로 확인된다. This study is designed to compile and analyze the gudeul elements excavated from the remains of above-ground buildings built during the Goryeo Dynasty according to each century in order to find out the process of the appearance of the full floor heating gudeul. The full floor heating gudeul underwent various changes in shape during the 11th and 12th century before it arrived as its initial shape during the mid to late 12th century. That is well shown by Yongin Yuun-ri No. 4, Ganghwa Shinbongri-Jangjeongri, and Ulju Yeongjado No. 11. In the early 13th century when the full floor heating gudeul of Yongin Namsa (Agok) No. 5-Ma point Building No. 5, Siheung Janghyeon Building No. 4 (No.1) were constructed, the full floor heating gudeul appeared as the main elements. In early and mid-13th century, when Pyeongtake Baekbongri Building A-1 and A-2 were built, the full floor heating gudeul fully took roots as the main heating system. After that time, the gudeul system appeared in various shapes if required by buildings, not bound by the plan of the building site. In the early 12th century, prior to the adoption of full floor heating gudeul as the main heating system, there appeared the wooden-floored room which was made independently by the compartment. The appearance of full floor heating gudeul and floor room are the main cause of the transition of the living mode from standing to sitting. In and after the 14th century, when the full floor heating gudeul was widely used around the country it was found that the various changes took place in the technology for the efficient increased heating function.
박종규(Jongkyu Park),제엽(Yub Je),이학수(Haksu Lee),문원규(Wonkyu Moon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
A new highly-directional ultrasonic range sensor is proposed to detect an obstacle. In the sensor, the parametric acoustic array, a nonlinear effect of media between two intensive waves, is applied to improve directivity. Particularly, we introduce a novel method to model the tranducer part for generating high amplitude waves consisted of two frequencies. The model combines the continnum model of bar and the compatibility condition between a piezoelectric actuator and linear horn. By using the model method, we could design the transducer to utilize two emitting primary frequency. The proposed transduce has shows a HPBW of less than 5° at 40㎑ that is much higher directivity than general ultrasonic range spatial sensor. Also, we could check that it has a primary wave of more than 125 ㏈ and a secondary difference wave of 90 ㏈.
박종규 ( Park Jongkyu ) 한국금융연구원 2017 KIF 연구보고서 Vol.2017 No.3
This study examines current state of and historical trends in Korea`s income inequality by analysing standard measures of the income inequality. Some causes which can explain its vicissitudes are also discussed. After referring to some of recent opinion polls which allude to severly negative perception the general public has about income inequality in Korea, this study reviews theoretical and empirical literature on inequality. It also evaluates how much effective the competing alternatives, which are economic growth or social expenditure, have been for reducing poverty or income inequality in Korea. With some concluding remarks, the author suggests desirable policy goals in order to alleviate income inequality.
우준식,이효진,박종규,박경규,조동진,장동준,박소정,최만식,유정규,WOO, JUNSIK,LEE, HYOJIN,PARK, JONGKYU,PARK, KYOUNGKYU,CHO, DONGJIN,JANG, DONGJUN,PARK, SOJUNG,CHOI, MANSIK,YOO, JEONGKYU 한국해양학회 2019 바다 Vol.24 No.1
The background concentrations of heavy metals in Korean coastal sediments were estimated using heavy metal data for 495 sediments obtained from 'National Marine Ecosystem Survey (Coastal ecosystem) in 2016-2017' and the extent of contamination was assessed. Al, Cs, and Li are chosen as appropriate indicators for sediment grain size. In the relationships between heavy metal and indicators concentrations, the lowest slope data were selected through the outlier removal and residual analysis, and the background concentrations were presented as a linear regression line between metal and indicator. Comparing the previous studies for the background concentrations of heavy metals in Korean coastal sediments, concentration levels were generally consistent but those for As and Cd were presented for the first time, and the background concentration using Li as the indicator was presented for the first time. 2016~2017년 '국가해양생태계 종합조사(연안생태계)'에서 얻어진 495개의 퇴적물 중금속 자료를 이용하여 한반도 연안 퇴적물의 중금속 배경농도를 산정하고 오염도를 평가하였다. 퇴적물 입도를 나타내는 지시자로 Al, Cs, Li이 적절하였으며, 이 들과 중금속 농도 사이의 관계에서 이상치 제거 및 잔차 분석을 통하여 가장 낮은 기울기의 자료를 선택하여 중금속과 지시자 사이의 회귀 직선으로 배경농도를 표시하였다. 기존 연구에서의 배경농도와 본 연구의 결과는 비교적 잘 일치하였으며, 본 연구에서는 As 및 Cd에 대해 처음으로 제시하였고, 지시자로 Li을 사용한 배경농도 식을 처음으로 제시하였다.
임베디드 시스템에서 원-폰 서비스를 위한 블루투스 액세스 포인트 개발
민병조,황준,박종규,김학배,Min Byungjo,Hwang June,Park Jongkyu,Kim Hagbae 한국정보처리학회 2004 정보처리학회논문지 A Vol.11 No.6
본 논문에서는 가정에서 블루투스 장비를 이용하여 액세스 네트워크에 접속하기 위한 블루투스 접속장비(AP)의 개발을 제안한다. 헤드셋, 마우스, 키보드 등과는 달리 AP는 다중 접속 및 안정된 네트워크 처리량을 유지할 수 있는 능력을 갖추어야 한다. 제안된 AP는 다양한 종류의 블루투스 장비들이 xDSL이나 PSTN으로 이루어진 액세스 네트워크에 안정적으로 접속하게 한다. 특히, 가정 내에서 AP는 사용자들이 one-Phone-블루투스 모듈이 포함된 셀룰러 전화기-을 이용하여 상대적으로 비싼 CDMA 네트워크 대신 PSTN에 접속할 수 있게 한다. In this paper, we describes the development of Bluetooth network Access Point(AP) for the access network connection of Bluetooth devices at home. Unlike headset, mouse, and keyboard, the AP should have capability to support multiple connection and stabilized network throughput. Our AP allows various kinds of Bluetooth terminals to access the access network like xDSL and PSTN(Public Swithced Telephone Network) stably. Especially, users can access the PSTN at home instead of expensive CDMA network through the AP by using the one-phone which is the cellular phone with the Bluetooth module.