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Ahn, Kihoon,Kim, Sung-Hwan,Lee, Gi-Hun,Lee, SeungJin,Heo, Yun Seok,Park, Joong Yull Hindawi Publishing Corporation 2016 Stem cells international Vol.2016 No.-
<P>Stem cells have infinite potential for regenerative therapy thanks to their advantageous ability which is differentiable to requisite cell types for recovery and self-renewal. The microsystem has been proved to be more helpful to stem cell studies compared to the traditional methods, relying on its advantageous feature of mimicking<I> in vivo</I> cellular environments as well as other profitable features such as minimum sample consumption for analysis and multiprocedures. A wide variety of microsystems were developed for stem cell studies; however, regenerative therapy-targeted applications of microtechnology should be more emphasized and gain more attractions since the regenerative therapy is one of ultimate goals of biologists and bioengineers. In this review, we introduce stem cell researches harnessing well-known microtechniques (microwell, micropattern, and microfluidic channel) in view point of physical principles and how these systems and principles have been implemented appropriately for characterizing stem cells and finding possible regenerative therapies. Biologists may gain information on the principles of microsystems to apply them to find solutions for their current challenges, and engineers may understand limitations of the conventional microsystems and find new chances for further developing practical microsystems. Through the well combination of engineers and biologists, the regenerative therapy-targeted stem cell researches harnessing microtechnology will find better suitable treatments for human disorders.</P>
KiHoon Sung,MD,Kyu Chan Lee,MD,Seung Heon Lee,MD,So Hyun Ahn,PhD,Seok Ho Lee,MD,Jinho Choi,PhD 대한방사선종양학회 2014 Radiation Oncology Journal Vol.32 No.2
Purpose: To quantify the cardiac dose reduction during breathing adapted radiotherapy using Real-time Position Management (RPM) system in the treatment of left-sided breast cancer. Materials and Methods: Twenty-two patients with left-sided breast cancer underwent CT scans during breathing maneuvers including free breathing (FB), deep inspiration breath-hold (DIBH), and end inspiration breath-hold (EIBH). The RPM system was used to monitor respiratory motion, and the in-house self respiration monitoring (SRM) system was used for visual feedback. For each scan, treatment plans were generated and dosimetric parameters from DIBH and EIBH plans were compared to those of FB plans. Results: All patients completed CT scans with different breathing maneuvers. When compared with FB plans, DIBH plans demonstrated significant reductions in irradiated heart volume and the heart V25, with the relative reduction of 71% and 70%, respectively (p < 0.001). EIBH plans also resulted in significantly smaller irradiated heart volume and lower heart V25 than FB plans, with the relative reduction of 39% and 37%, respectively (p = 0.002). Despite of significant expansion of lung volume using inspiration breath-hold, there were no significant differences in left lung V25 among the three plans. Conclusion: In comparison with FB, both DIBH and EIBH plans demonstrated a significant reduction of radiation dose to the heart. In the training course, SRM system was useful and effective in terms of positional reproducibility and patient compliance.
Sung, KiHoon,Lee, Kyu Chan,Lee, Seung Heon,Ahn, So Hyun,Lee, Seok Ho,Choi, Jinho The Korean Society for Radiation Oncology 2014 Radiation Oncology Journal Vol.32 No.2
Purpose: To quantify the cardiac dose reduction during breathing adapted radiotherapy using Real-time Position Management (RPM) system in the treatment of left-sided breast cancer. Materials and Methods: Twenty-two patients with left-sided breast cancer underwent CT scans during breathing maneuvers including free breathing (FB), deep inspiration breath-hold (DIBH), and end inspiration breath-hold (EIBH). The RPM system was used to monitor respiratory motion, and the in-house self respiration monitoring (SRM) system was used for visual feedback. For each scan, treatment plans were generated and dosimetric parameters from DIBH and EIBH plans were compared to those of FB plans. Results: All patients completed CT scans with different breathing maneuvers. When compared with FB plans, DIBH plans demonstrated significant reductions in irradiated heart volume and the heart $V_{25}$, with the relative reduction of 71% and 70%, respectively (p < 0.001). EIBH plans also resulted in significantly smaller irradiated heart volume and lower heart $V_{25}$ than FB plans, with the relative reduction of 39% and 37%, respectively (p = 0.002). Despite of significant expansion of lung volume using inspiration breath-hold, there were no significant differences in left lung $V_{25}$ among the three plans. Conclusion: In comparison with FB, both DIBH and EIBH plans demonstrated a significant reduction of radiation dose to the heart. In the training course, SRM system was useful and effective in terms of positional reproducibility and patient compliance.
동학모형을 이용한 천연가스 수요 조정 메커니즘에 대한 연구
안은영(Eunyoung Ahn),이기훈(Kihoon Lee) 충남대학교 경영경제연구소 2010 경영경제연구 Vol.33 No.1
천연가스는 청정 에너지원으로서 소득 향상과 기후변화협약의 진전으로 수요가 크게 증가하였고 또 앞으로도 계속 증가할 전망이다. 본 연구는 패널 모형을 이용하여 미국, 캐나다, 영국, 프랑스, 일본, 그리고 우리나라의 천연가스 수요와 가격 및 소득간의 관계를 추정한다. 국가별 분석과 아울러 산업, 가정 및 수송, 전력 등 부문별 수요함수도 추정한다. 특히 천연가스 수요의 동태적 조정 과정을 파악하고, 소득과 가격의 수요 탄력성을 장기와 단기 구분하여 추정이 가능하도록 통상적인 정태 패널 모형을 동태 모형으로 전환한다. 대상기간은 한국은 1991-2005년이나 나머지 국가는 1978-2005년이다. 추정 결과 가장 특징적인 현상은 국가와 부문 구분없이 전반적으로 천연가스 수요는 조정 속도가 매우 완만한 것으로 나타났다. 그 결과 천연가스 수요의 가격에 대한 장기 탄력성과 단기 탄력성의 격차도 큰 현상이 발견되었다. 소득 탄력성은 가격탄력성보다 높게 나타나 천연가스 수요가 소득 변화에 더 탄력적임을 보여준다. As a clean energy source, natural gas demand is expected to greatly increase due to income growth and concerns over climate change. We estimate the relationships among natural gas demands, prices, and incomes in industry, residential and transport, and transformation sectors of the USA, Canada, the UK, France, Japan, and Korea. Korean data covers the period 1991-2005, and data from the other nations covers the period 1979-2005. The dynamic panel model is applied to the conventional static panel model to estimate short-term and long-term demand elasticities of price and income in each sector of each country. This approach also provides the demand adjustment process for each country and sector. We find natural gas demand is more sensitive to income than price and the existence of demand inertia in a sense that the demand adjustment processes for natural gas demand are very low. The price elasticities of demand in short-run are found to be smaller than those in long-term for all sectors in all countries.
이태호(Taeho Lee),이기훈(Kihoon Lee),안건태(Geontae Ahn),이명준(Myungjoon Lee) 한국정보과학회 2008 한국정보과학회 학술발표논문집 Vol.35 No.1
최근 디스플레이 장치의 발전에 따라 대형 디스프레이 장치를 활용하는 범위가 확대되었다. 이러한 대형디스플레이 장치를 활용하는 범위의 확장에 따라 여러 사람이 대형 디스플레이 장치를 효율적으로 공유하는 것이 바람직하다. VNC(Virtual Network Computing)는 GUI를 통한 원격 제어 도구로써 다른 지역에 위치한 컴퓨터로 데스크탑 화면을 전송할 수 있다. 또한 VNC는 하나의 세션에 두 명 이상의 사용자가 동시에 같은 데스크탑 화면을 사용할 수 있다. 본 논문에서는 VNC를 활용한 디스플레이 장치의 공유에 대하여 기술한다. VNC 서버를 이용하여 대형 디스플레이 장치에 화면을 전송하며 대형 디스플레이 장치는 JavaViewer를 통하여 전송받은 데스크탑 화면을 출력할 수 있다. 그리고 디스플레이 공유 관리 도구를 통하여 동시에 여러 사람이 데스크탑 화면을 전송하는 것을 효율적으로 관리할 수 있다.
Passive Bypass Using Anthron Tube in Adult Living Donor Liver Transplantation
SungGyu Lee,Shin Hwang,KiHoon Kim,ChulSoo Ahn,KwangMin Park,YoungJoo Lee,DeokBog Moon,ChongWoo Chu,HyunSeong Yang,SungHoon Cho,KiBong Oh,TaeYong Ha,KiWon Song,YunSik Yu,PyungChul Min 대한외과학회 2002 대한외과학회 학술대회 초록집 Vol.2002 No.10