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광학현미경과 투과전자현미경을 이용한 토끼와 닭 대퇴골의 미세구조 분석
김창연,김은경,전태훈,남승원,김윤중,Kim, Chang-Yeon,Kim, Eun-Kyung,Jeon, Tae-Hoon,Nam, Seung-Won,Kim, Youn-Joong 한국현미경학회 2010 Applied microscopy Vol.40 No.3
뼈는 단계별 (hierarchical) 구조를 가진 복합 재료이며 독특한 구조와 기계적 특성 때문에 재료공학 분야에서 많이 연구되어져 왔다. 뼈는 주로 hydroxyapatite, 콜라겐과 물로 구성된 층판형 유 무기 재료 복합체이다. 주요 무기물로써 hydroxyapatite로 잘 알려진 calcium phosphate를 통하여 뼈는 특유의 강도를 유지하게 된다. 본 실험에서는 광학 현미경(LM)과 투과전자현미경(TEM)을 이용하여 토끼와 닭 대퇴골의 구조를 연구하였다. 구성물질 분석은 대퇴골의 calcium, potassium, oxygen 분포 변화를 알아보는데 이용하였다. 실험은 두 구조 범위에 중점을 두었다: micro scale에서 치밀골의 배열을, nano scale에서 콜라겐 섬유와 apatite 결정을 관찰하였다. Micro scale에서 닭과 토끼 대퇴골 구조의 뚜렷한 차이점이 발견되었다. Nano scale에서는 apatite 결정의 모양과 크기 그리고 콜라겐의 배열을 비교 분석하였다. 그 결과 토끼와 닭은 종이 다름에도 불구하고 nano scale에서는 화학성분과 구조가 매우 유사한 것으로 나타났다. Bone is a hierarchically structured composite material which has been well studied by the materials engineering community because of its unique structure and mechanical properties. Bone is a laminated organic-inorganic composite composed of primarily hydroxyapatite, collagen and water. The main mineral that gives bone's hardness is calcium phosphate, which is also known as hydroxyapatite. Light microscopy (LM) and transmission electron microscopy (TEM) were used to study the structure of femurs from chicken and rabbit. The elemental analysis was used to search variation in the distribution of calcium, potassium and oxygen in the femur. Current investigation focused on two structural scales: micro scale (arrangement of compact bone) and nano scale (collagen fibril and apatite crystals). At micro scale, distinct difference was found in microstructures of chicken femur and rabbit femur. At nano scale, we analyzed the shape and size of apatite crystals and the arrangement of collagen fibril. Consequently, femurs of chicken and rabbit had very similar chemical property and structures at nano scale despite of their different species.
파킨슨병, 파킨슨 의증 환자 2례에서 추나치료에 대한 증례보고
김창연,민지연,최영규,고영탁,정영훈,김태수,Kim, Chang-Yeon,Min, Ji-Yeon,Choi, Young-Gui,Koh, Young-Tak,Jung, Young-Hoon,Cho, In-Hee,Kim, Tae-Soo 척추신경추나의학회 2005 대한추나의학회지 Vol.6 No.1
Object : To discuss the Use of Chuna treatment in managing two patients with Parkinson's disease and/or Parkinson' syndrome Methods : This clinical study was carried out of 2 cases with confirmed by certified neurologist Parkinson's disease and/or Parkinson' syndrome. One case had been admitted from 2004.09.16 to 2004.09.24 and treated from 2004.09.26 to 2004.10.15 and the other case had been admitted from 2004.10.21 to 2004.11.06 and treated from 2004.11.08 to 2004.11.15 in the department of acupuncture and moxibustion of Ha-na oriental medical center. Results : There was significant improvement in condition of the two patients treated by Chuna treatment(upper cervical to promote CSF circulation) on Parkinson's disease or Parkinson' syndrome. Conclusion: In the case, we treated two patients of Parkinson's disease and/or Parkinson' syndrome. Chuna treatment efficiently relieved the symptoms including tremor and bradykinesia.
128K$\times$8bit SRAM 메모리 다중칩 패키지 제작
김창연,지용,Kim, Chang-Yeon,Jee, Yong 대한전자공학회 1994 전자공학회논문지-A Vol.31 No.3
We experimented on memory multichip modules to increase the packing density of memory devices and to improve their electrical characteristics. A 128K$\times$8bit SRAM module was made of four 32K$\times$8bit SRAM memory chips. The memory multichip module was constructed on a low-cost double sided PCB(printed circuit boared) substrate. In the process of fabricating a multichip module. we focused on the improvement of its electrical characteristics. volume, and weight by employing bare memory chips. The characteristics of the bare chip module was compared with that of the module with four packaged chips. We conducted circuit routing with a PCAD program, and found the followings: the routed area for the module with bare memory chips reduced to a quarter of that area for module with packaged memory chips. 1/8 in volume, 1/5 in weight. Signal transmission delay times calculated by using transmission line model was reduced from 0.8 nsec to 0.4 nsec only on the module board, but the coupling coefficinet was not changed. Thus, we realized that the electrical characteristics of multichip packages on PCB board be improved greatly when using bare memory chips.
김창연,지용,Kim, Chang-Yeon,Jee, Yong 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.3
In this paper, we ecamined the effect that MCM-L technique influencess on the design and fabrication of multichip memory modules in increasing the packing desity of memory capacity and maximizing its electrical characteristics. For that purpose, we examined the effective methods of reducing the area of module layout and the wiring length with the variation of chip allocation and the number of wiring layers. We fabricated a 256K${\times}$8bit SRAM module with eight 32K${\times}$8bit SRAM chips. The routing experiment showed that we could optimize the area of module layout and wiring length by placing chips in a row, arranging module I/O pads parallel to chip I/O pads, and equalizing the number of terminal sides of module I/O's to that of chip I/O's. The routing was optimized when we used three wire layers in case of one sided chip mounting or five wire layers in case of double sided chip mounting. The fabricated modules showed 18.9 cm/cm$^{2}$ in wiring density, 65 % in substrate occupancy efficiency, and module substrate and functionally tested to find out the module working perfectly.
김창연(Kim, Chang-Yeon),김동규(Kim, Dong-Gyu),신병환(Shin, Byung-Hwan),금종수(Kum, Jong-Soo) 한국건축친환경설비학회 2014 한국건축친환경설비학회 논문집 Vol.8 No.4
Korea has 4 distinct seasons, so heat recovery ventilators help to save energy. In the summer, indoor and outdoor temperature differences are relatively less than winter’s. This is not a problem for the summer season and the change in temperature or location and installation of the heat recovery ventilation device. But, in winter, the temperature difference between indoors and outdoors is large. Thus, much moisture found in indoor air is released to the outdoors through ventilators. This condensation causes freezing problems that need to be considered. In this study, the effect on the moisture ventilator is analyzed by using two constant temperature humidity chambers that can be operated in winter for either indoor or outdoor environments.
CFD를 이용한 열회수형 환기장치 운전에 따른 혹한기 공동주택의 실내 열환경 검토
김창연(Chang-Yeon Kim),박종일(Jong-Il Park),김동규(Dong-Gyu Kim),신병환(Byong-Hwan Shin),금종수(Jong-Soo Kum) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.6
In Korea, it is the law that an apartment building which consists of over 100 households must have a ventilation system installed, either natural or mechanical. The heat recovery ventilator (HRV) is great way to reduce energy consumption. In this research we confirmed that based on site’s construction plan and existing diffuser form, performed purpose CFD which simulates operation in temperatures below -5℃ to circumstances of installation of an HRV in an apartment. As a result of this research we found that when the diffuser’s aperture area was adjusted, the distribution of air temperature and residence time of air was more equally distributed and air temperature was higher, compared to when the diffuser has an identical aperture area. We also found that we are able to increase even more air temperature and air distribution of air temperature and residence time of air was even more equally distributed when run in parallel with a splitter damper.