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李尙燁(Sangyoup Lee) 중부고고학회 2006 고고학 Vol.5 No.1
환호는 최근까지 대부분 영남지방을 중심으로 확인되었으나, 조사의 증가에 따라 중부지역에서도 다수 확인되었다. 따라서 중부지역에서 환호 중 안성 반제리유적의 환호를 중심으로 그 기능을 살펴보고자 하였다. 환호는 전세계적으로 분포하고 있으며, 시기적으로는 신석기시대 이후부터 출현하고 있는데, 대부분은 주거지와 동반되는 것이 일반적 현상이다. 이러한 환호의 기능에 대해 대부분 방어ㆍ경계ㆍ의례를 위해 조성된 것으로 이해하고 있다. 중부지역에서 확인된 환호는 안성 반제리유적ㆍ부천 고강동 적석유구ㆍ화성 동탄 동학산유적ㆍ오산 가장동유적ㆍ부여 송국리유적ㆍ청원 대율리유적ㆍ강릉 방동리유적 등이며, 입지를 통해 산정형과 구릉형, 형태를 통해 테뫼형 환호와 포곡형 환호로 구분할 수 있다. 안성 반제리유적에서 확인된 환호는 입지상 산정형, 형태상 태뫼형에 해당된다. 환호의 내부에는 환호가 처음 사용되었던 시기의 주거지가 확인되지 않으며, 정상부에 비교적 큰 규모의 바위가 자리하고 있다. 한편 환호는 기능이 상실됨에 따라 폐기되었으며, 이후 환호 내부 또는 환호를 파괴하고 초기철기시대의 주거지가 조성되었다. 안성 반제리유적 환호의 사용시기는 환호의 퇴적토에서 출토된 유물 원형정토대토기와 두형토기 등을 통해 B.C. 5세기에 처음 조성되었던 것으로 추정되며, 정확한 폐기 시기는 알 수 없는 실정이다. 한편 환호 폐기 후 조성된 주거지 출토유물 중 구연의 단면이 원형에서 방형으로 변화되는 토기를 통해 반제리유적은 B.C. 2세기 이전에 폐기된 듯하다. 환호의 기능은 초축시 내부에 생활과 관련된 공간인 주거지가 확인되지 않아 환호의 제기능 중 儀禮 즉, 祭儀의 기능을 수행하였던 것으로 추정하였다. Ditches were discovered around the yeongnam area until a recent date but discovered around the middle area by increased research. So we will inspect the function of ditches of the Ban je-ri ruins among ditches of the middle area. Ditches are distributed all over the world. It appeared after the New Stone Age and most of it usually be accompanied with habitation site. We understand that the function of ditches is for defense, precaution and ceremony. Ditches which were discovered around the middle area are the Ban je-ri ruins in the Anseong city, the Jeokseok synonymous phrase in the Gokang-dong. Bucheon city, the Donghak mountain ruins in the Dongtan. Hwaseong city, Gajang-dong ruins in the Osan city. Songguk-ri ruins in the Buyeo-gun, Bangdong-ri ruins in the Gangneung city, And that is classified a mountaintop type and hill type by location and a headband type and pile up block shape. Ditches were discovered in the Ban je-ri. Anseong city is a mountaintop type by location and a headband type by shape. The habitation site where was used at first stage wasn’t discovered in the inside of ditches and there is relatively big rock in the top. On the other hand ditches were disused by losing function. Then the habitation of the first Iron Age was formed after destroying the ditches or inside of ditches. We presumed the used time of the ditches of Ban je-ri. Anseong city is B.C. 5th century through bowl with round clay stripe and mounted dish from a sedimentary soil of the ditches. Disused time is unknown but we presumed the disused time is before B.C. 2nd century through dish section was changed to square shape from round shape among excavated ruins on the habitation which was formed afterdisusing ditches. We presumed that function or ditches is ceremony because the habitation where is a space in relation to life wasn’t discovered when it was under construction.
외부 자계 영향을 받는 자성 나노 입자 거동에 대한 2색 형광 PIV 적용
이창제(ChangJe Lee),이상엽(Sangyoup Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Particles which have different material conditions and mechanical properties behave their special motions under the external conditions. Fe3O4 particles which have magnetic properties also have their own characteristics such as align through the solenoid-nozzle in external magnetic field. When the external magnetic field appears. Fe3O4 particles have been changed because of their magnetism compare with other non-magnetic particles like polystyrene particles. To optimize the solenoid-nozzle, change the magnet wire span size and connection method. The result show that span layer 1 and parallel connection generated high amp then span layer 5 and serial connection. We used 200nm fluorescent magnetic nano particles and 500nm fluorescent polystyrene particles which have different emission wavelength range to separate each image of particles under the one and two phase flow in the solenoid-nozzle. Both particles excited from 532nm laser system and their emission signals were imaged with two color fluorescent Particle Image Velocimetry (PIV). One EM-CCD camera with dichroic filter were used to capture images for separate phases. Instantaneous images for both magnetic and nonmagnetic nano particle was captured simultaneously.
이창제(ChangJe Lee),이상엽(Sangyoup Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Particles which have different material conditions and mechanical properties behave their special motions under the external conditions. Fe3O4 particles which have magnetic properties also have their own characteristics such as align through the solenoid-nozzle in external magnetic field. When the external magnetic field appears, Fe3O4 particles have been changed because of their magnetism compare with other non-magnetic particles like polystyrene particles. To optimize the solenoid-nozzle, change the magnet wire span size and connection method. The result show that span layer 1 and parallel connection generated high amp then span layer 5 and serial connection. We used 1um fluorescent magnetic nano particles and 1um fluorescent polystyrene particles which have different emission wavelength range to separate each image of particles under the one and two phase flow in the solenoid-nozzle. Both particles excited from 532nm laser system and their emission signals were imaged with two color fluorescent Particle Image Velocimetry(PIV). One EM-CCD camera with dichroic filter were used to capture images for separate phases. Instantaneous images for both magnetic and nonmagnetic nano particle was captured simultaneously.
Single Plane Illumination Microscopy – MicroPIV를 이용한 버블 유동에서 외부 자계 영향을 받는 자성입자 가시화
이창제(Changje Lee),조경래(Gyeong-rae Cho),이상엽(Sangyoup Lee) 한국가시화정보학회 2021 한국가시화정보학회지 Vol.19 No.1
This study measured the velocity of magnetic particles inside the power generation using external heat sources. Single Plane Illumination Microscopy (SPIM) was used to measure magnetic particles that are simultaneously affected by bubbly flow and magnetic field. It has the advantage of reducing errors due to particle superposition by illuminating the thin light sheet. The hydraulic diameter of the power generation is 3mm. Its surface is covered with a coil with a diameter of 0.3 mm. The average diameter of a magnetic particle is 200nm. The excitation and emission wavelengths are 530 and 650nm, respectively. In order to find out the flow characteristics, a total of four velocity fields were calculated in wide and narrow gap air bubbles, between the wall and the air bubble and just below the air bubble. Magnetic particles showed up to 8.59% velocity reduction in the wide gap between air bubbles due to external magnetic field.
PIV를 이용한 외부자계 영향을 받는 채널 내 비자성입자와 자성입자의 정렬도 추정
이창제(ChangJe Lee),김가영(Ka-yeong Kim),이상엽(Sangyoup Lee) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Particles which have different material conditions and mechanical properties behave their special motions under the external conditions. Fe3O4 particles which have magnetic properties also have their own characteristics such as align through the solenoid-nozzle in external magnetic field. When the external magnetic field appears, Fe3O4 particles have been changed because of their magnetism compare with other non-magnetic particles like polystyrene particles. For imaging these changes such as alignment of magnetic particles, it is necessary to systematize PIV set-up and solenoid-nozzle in external magnet. We used fluorescent magnetic particles and same size of fluorescent polystyrene particles which have different emission wavelength range to separate each image of particles under the one-phase flow in the nozzle. Also, we controlled the flow rate, nozzle size, and observation view of nozzle. Both particles excited from laser system and their emission signals were imaged with long working distance objective lens system and CCD camera. In addition, its possible for analyzing of two kinds of particles behaviors using average cross-correlation method. Based on these systems, we compared each velocity and vorticity of magnetic particles and non-magnetic particles in magnetic condition. This study will provide optically relevant micro PIV for estimation of magnetic and non-magnetic particles alignment.