http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김봉환,Kim, Bong-Hwan 한국광학회 2007 한국광학회지 Vol.18 No.2
In this study, clinical data for emmetopia in young Koreans was taken in order to design the finite schematic eye, which had optical properties of real eyes including spherical aberration, astigmatism, field curvature and distortion. Furthermore, the crystalline lens with GRIN medium was optically analyzed, and the finite schematic eye with the GRIN crystalline lens was designed. 젊은 한국인 정시안에 대한 임상 자료를 가지고 구면수차 이외에 비축수차인 비점수차, 상면만곡과 왜곡수차들을 포함하는 실안의 광학적 성능과 유사한 정밀모형안을 설계하였다. 또한 수정체가 갖는 Gradient index 형태의 매질을 광학적으로 조사하였고, GRIN 매질을 수정체에 도입하여 정밀모형안을 설계하였다.
김봉환,전예진 (사)한국정부회계학회 2023 정부회계연구 Vol.21 No.2
The expansionary fiscal management conducted in the COVID-19 response process and the resulting increase in national debt are increasing the need for fiscal risk analysis. Therefore, this study conducts a study on the introduction of a fiscal risk management report that combines and publishes financial risk management reports scattered by governmental institutions into a single report. To this end, this study conducts domestic and foreign literature research. First, the public debt management guidelines of major international organizations, the IMF and the World Bank, and the UK's fiscal risk reports are analyzed in detail. Also, we examine various studies on fiscal risk conducted in Korea. Furthermore, we analyze various reports on fiscal and long-term outlook published by the National Assembly Budget Office and the Ministry of Economy and Finance: the frequency of publication, accounting system, assumptions, and main contents of the reports. Through these literature studies in Korea and abroad, we derive the problems of reports related to fiscal risk in Korea and propose five specific methods for introducing a fiscal risk management report. 코로나 19 대응과정에서 실시된 확장적 재정운용과 이에 따른 국가채무 증가는 재정위험(fiscal risk) 분석의 필요성을 증가하고 있다. 이에 본 연구는 국가기관별로 산재되어있는 재정위험 분석을 하나의 보고서로 종합하여 발간하는 재정위험관리보고서 도입방안에 대한 연구를 진행한다. 이를 위하여 본 연구는 국내외 문헌 연구를 실시한다. 먼저, 주요 국제기구인 IMF와 World Bank의 공적 채무 관리 지침과 영국의 재정위험보고서의 해외사례를 세밀하게 분석한다. 이후, 국내에서 실시된 재정위험에 관한 다양한 연구들을 살펴본다. 나아가 국회예산정책처와 기획재정부에서 발간한 재정전망 및 장기전망에 관한 보고서를 발간빈도, 회계제도, 가정 및 주요 내용을 구체적으로 살펴본다. 이러한 국내외의 다양한 문헌연구를 통해 우리나라 재정위험 관련 보고서의 문제점을 도출하고, 재정위험보고서 도입을 위한 다섯 가지의 구체적인 방안을 제시한다.
Electrostatically Driven Single Chamber Bidrectional Peristaltic Gas Micropump with Four Electrodes
김봉환,이기성,Mark A. Shannon 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.6
An electrostatically driven valveless peristaltic micropump has been developed for pumping gases through microsystems, such as a micro-gas chromatography system. The pump was operated from 85 V up to 115 V, and a maximum flow rate of 40.3 µl/min was measured at 14 Hz and 95 V with an estimated power consumption of 0.87 mW /sccm. The peristaltic micropump has one long chamber and four electrodes that divide one chamber into four small chambers during operation.
김봉환,문철진 한국기계기술학회 2011 한국기계기술학회지 Vol.13 No.4
The purpose of this study is to investigate the actual field application of the super-charger for heavy equipment. In this paper, the numerical analysis and performance evaluating experiments were performed. ANSYS CFX program has been used to obtain the solutions for the problems of three-dimensional turbulent air flow in the super-charger. To evaluate the flow performance of the super-charger, the performance test facility and data acquisition system were manufactured. We obtained satisfactory results from CFD analysis and flow experiment.
Asymmetric Timeliness and Delayed Recognition of Bad News
김봉환 서울대학교행정대학원 2011 The Korean Journal of Policy Studies Vol.26 No.1
This article examines whether the asymmetric timeliness measure captures delayed recognition of bad news and in which manner this delayed recognition occurs. I find that negative earnings changes of firms with high asymmetric timeliness have significant predictive power for future earnings changes of low-asymmetric-timeliness firms in the same industry. In contrast, the negative earnings changes of firms with low asymmetric timeliness do not have predictive power for future earnings changes of high-asymmetric-timeliness firms in the same industry. Moreover, neither type of firm has predictive power for the other group when earnings changes are positive. This result suggests that high-asymmetric-timeliness firms recognize the effects of a common negative shock before low-asymmetric-timeliness firms. Further, low-asymmetric-timeliness firms have more frequent and smaller negative earnings changes, suggesting that the eventual recognition of negative news “trickles out” as opposed to being recognized in an “earnings bath.”