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느타리버섯 재배 토양으로부터 분리한 Ochrobactrum anthropi A-1의 식물생장촉진효과
이창재,이헌학,윤민호 한국버섯학회 2015 한국버섯학회지 Vol.13 No.4
An auxin-producing bacteria (A-1) was isolated from soils of Oyster mushroom farmhouse in Daejeon city, South Korea. The strain A-1 was classified as a novel strain of Ochrobactrum anthropi based on a chemotaxanomic and phylogenetic analyses. The isolate was confirmed to produce indole-3-acetic acid (IAA), one of auxin hormones, by TLC and HPLC analyses. The maximum concentration of IAA, 5.6 mg L-1 was detected from the culture broth of O. anthropi A-1 incubated for 24 h at 35oC in R2A broth containing 0.1% L-tryptophan. To investigate the growth-promoting effects to the crops, the culture broth of O. anthropi A-1 was inoculated to water cultures and seed pots of mung bean as well as lettuce. In consequence, the adventitious root induction and root growth of mung bean and lettuce were 2.7 and 1.4 times higher than those of the non-inoculated, respectively
Photon Absorption and Emission Statistics of a Two-level Atom in a Cavity
이창재 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.5
The absorption and the emission of photons by an atom involves quantum jumps between states. We investigate the quantum jump statistics for the system of a two-level atom and a single-mode cavity field. We use the Jaynes-Cummings model for this problem, perform Monte Carlo numerical simulations, and give a detailed exact analysis on these simulations. These studies reveal that the waiting-time distribution (WTD) for photon absorptions (emissions) has a unique novel statistic, and that the photon absorption (emission) rate is not uniform, but counter-intuitively depends on the position in the Rabi cycle. The effects of the nonclassical nature of the field on the WTD is discussed.
비외상성 복통을 주소로 응급의료센터에 내원한 젊은 여성 환자의 급성 복증 감별에 있어서 이학적 및 검사실 인자들에 대한 다변량 분석
이창재,정태녕,임득호,진수근,김옥준,최성욱,김의중,조윤경 대한응급의학회 2011 大韓應急醫學會誌 Vol.22 No.6
Purpose: One of the most challenging groups of patients to diagnose that visit an emergency department (ED) is the female with acute abdominal pain. The causes of acute abdominal pain range from minor, self-limiting conditions to life-threatening disorders. Differential diagnosis for these patients is extensive and frequently requires multiple examinations and tests. This study analyzed the effectiveness of surgical abdomen detection using various physical examination and clinical laboratory methods, for young women reporting non-traumatic abdominal pain. Methods: This study reviewed computed tomography (CT)reports for 232 women, aged 21~35 years old, who visited our ED for nontraumatic abdominal pain from July 2009 to June 2010. Bivariate analyses relating physical and laboratory methods used to detect surgical abdomen were conducted. A multivariate logistic regression model was then derived,with all variables in the final model significant at p<0.05. Results: The number of patients who required surgical intervention was 88, while the number who did not require surgery was 144. Significant predictive methods for identifying surgical abdomen were maximal tenderness site (p=0.019), rebound tenderness (p=0.037), white blood cell count (p=0.012) and urine blood (p=0.037). The bootstrap result was identical in 1000 samples with a 95% confidence interval. Conclusion: Maximal tenderness site, rebound tenderness,and results indicating leukocytosis and hematuria were found to be independently valid factors for detection of surgical abdomen in young women evaluated in our ED due for nontraumatic abdominal pain.
Shockwave Simulations and Visualization for Teaching Quantum Chemistry
이창재,Lee, Chang-Jae Korean Chemical Society 2009 대한화학회지 Vol.53 No.2
양자화학에는 추상적이거나 비직관적인 개념이 많이 존재하여 학생들이 이해하기에 어려움 을 준다. 다행히, 전통적인 강의실에서의 강의를 보조할 멀티미디어 웹 응용프로그램을 제작할 강력한 도구들이 웹 기술의 발전으로 많이 생겼다. 이 논문에서는 이 문제를 다루는 한 방안으로서 쇽웨이브 기술을 이용하여 웹 브라우저 상에서 쌍방향 시뮬레이션과 시각화를 동시에 해결하는 방법을 제시한 다. 여러 예를 통하여 어떻게 쇽웨이브 기술의 특성을 이용하여 웹에 기반을 둔 학습 자료를 용이하게 개발하는가를 보여준다. Quantum chemistry has many concepts that are either abstract or counterintuitive, giving students difficulties in understanding them. Fortunately, the advancement of web technologies provides us with hordes of powerful tools to produce rich multimedia web applications that supplement traditional classroom teaching. In this paper we present an approach to address this issue that combines interactive simulations and visualization on the web browser using Shockwave technology. With several examples, we show how to take advantage of the features of the Shockwave technology in developing web-based course material with ease.