http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Influence of boreal summer intraseasonal oscillation on rainfall extremes in southern China
Hsu, Pang‐,Chi,Lee, June‐,Yi,Ha, Kyung‐,Ja John Wiley Sons, Ltd 2016 International journal of climatology Vol.36 No.3
<P><B>ABSTRACT</B></P><P>How boreal summer intraseasonal oscillation (BSISO) modulates the probability and spatial distributions of extreme rainfall occurrence over populous southern China was examined, using the newly proposed BSISO indices and two high‐resolution rain‐gauge‐based rainfall datasets in China. The probability density function of May–August rainfall in southern China is skewed towards large values in phases 2–4 of the first component and in phases 5–7 of the second component of BSISO life cycle, during which the probability of extreme rainfall events at the 75th (90th) percentile increases by 30–50% (over 60%) relative to the non‐BSISO period. The devastating floods with prolonged extreme rainfall in southern China over the three past decades occurred coincidently with these BSISO phases. The first component of BSISO, associated with 30–60‐day eastward/northeastward‐propagating ISO, is more favourable for the rainfall extreme over in‐land China. In contrast, the second component of BSISO, related to the 10–30‐day northwestward propagating ISO, tends to link with the rainfall extreme along the southeast coast of South China. Moisture budget indicates that the favourable environment for rainfall extreme is associated with southwesterly moisture convergence over southern China, while the moisture advection contributes insignificantly. This study suggests a potential for monitoring and probabilistic prediction of extreme rainfall events in southern China based on the real‐time BSISO indices.</P>
Pang-Jung Liu,Yu-Chi Hsu,Ting-Yu Wei,Zhi-Yuan Hong 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents a dc-dc converter with selfregulated output voltage (SROV) and phase shift PWM (PSPWM) control methods for multiple LED strings. The LED driver is composed of a boost converter and dimmable current balancing regulators (CBRs). Compared with traditional linear current regulator, the CBR is adopted to reduce power consumption. To keep a designed constant voltage on the CBRs, the output voltage of the boost converter is dynamically adjusted with the SROV control method. It results in high efficiency and current balance of the CBRs and prevents output voltage oscillation. The PSPWM control is employed to mitigate the output current variation supplied by the boot converter, leading to smaller output transient ripple when the PWM dimming signals are changed. The CBRs and control circuits were fabricated with a 0.35-μm standard CMOS technology. The experimental results demonstrate the theoretical analysis of the proposed LED driver.
여름철 계절안 진동이 한반도 강수에 미치는 영향 및 장기 변화 특성 연구
이준이,Pang-Chi Hsu,문수연,하경자 한국기상학회 2017 대기 Vol.27 No.4
By analyzing Asian Precipitation-Highly-Resolved Observational Data Integration Towards Evaluation (APHRODITE) from May to September for 1951~2007, this study investigates impacts of two dominant boreal summer intraseasonal oscillation (BSISO) modes on precipitation over Monsoon Asia including Korea and long-term change of 10~20-day and 30~60- day ISO over Korea. It is shown that BSISO strongly modulates rainfall variability over the many part of Monsoon Asia including Korea. Korea tends to have more (less) rainfall during the phases 3~5 (7~8) of BSISO1 representing the canonical northward/northeastward propagating 30~60-day ISO and during the phases 6~8 (3~5) of BSISO2 representing the northward/northwestward propagating 10~20-day ISO. It is found that the 10~20-day ISO variability contributes to summer mean rainfall variability more than 30~60-day ISO over Korea. For the 57 years of 1951~2007, the correlation coefficient between the May to September mean precipitation anomaly and standard deviation of 10~20-day (30~60-day) ISO is 0.71 (0.46). It is further noted that there is a significant increasing trend in the 10~20-day and 30~60-day ISO variability in the rainy season during the period of 1951 to 2007.