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Characteristics of Ozone Concentration in the Rural Area of Korea
Chung, Yong Seung,Zhong, Liang Xi 한국환경과학회 1995 한국환경과학회지 Vol.4 No.1
Continuous measurements of ground-level ozone (O_3) were made in five minutes intervals in the rural area of Korea from July 1993 to June 1994. This site is located in Chongwon, near latitude 36.4˚ N, longitude 127.6˚ E. The results show that the one-year mean value was 17 ppb, and monthly mean ranged from 6 to 47 ppb. A pronounced maximum in summer and a minimum in winter were found, and these were related to anthropogenic emission and photochemical reaction. Diurnal variations of ozone concentration showed a normal distribution with a maximum at 15:00 - 16:00 and a minimum at 07:00 - 08:00. During the period when ozone concentration was very high (> 80 ppb), the stable winds were from N and NW; on the other hand, when ozone concentration was very low, air movement in the large scale was from the North Pacific Ocean. This suggests that in the rural area the long range transport of anthropogenic pollutants from distant sources can contribute to the larger contribution than the generation of ozone from local sources in the rural area.
Design of a Fuzzy Logic-based Plant Quality Estimation System base on Morphological Features
( Chung-liang Chang ),( Wei-lun Fu ),( Jun-yong Tian ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Automatic growth monitoring of plants technique is crucial for the development of biodiversity and innovative agriculture. Traditional manual recording mode is more complicated and time-consuming, which requires professional skills and expertise background, which is comparatively difficult for non-expert users. In this paper, the fuzzy logic inference method is adopted to estimate the growth quality of plant based on leaf area, leaf number, and the contour area of plant. The image processing technique is employed to conduct plant morphological measurement, including hue of transformation, edge detection, and color histogram. The proposed system has been tested and evaluated successfully in a plant growth chamber. The results show that the estimation error of proposed system is in the range of acceptance for plant quality modeling.
Chung-Lin Lee,Ying-Hsu Chang,Chung-Yi Liu,Ming-Li Hsieh,Liang-Kang Huang,Yuan-Cheng Chu,Hung-Cheng Kan,Po-Hung Lin,Kai-Jie Yu,Cheng-Keng Chuang,Chun-Te Wu,See-Tong Pang,I-Hung Shao 대한비뇨의학회 2022 Investigative and Clinical Urology Vol.63 No.5
Purpose: Metastatic castration-resistant prostate cancer (mCRPC) has a poor prognosis. Abiraterone acetate (AA), enzalutamide, and chemotherapy are first-line treatments for patients with mCRPC. This study examined prognostic factors for AA response in the form of prostate-specific antigen (PSA) kinetics throughout androgen-deprivation therapy (ADT) in chemonaïve patients with mCRPC. Materials and Methods: We retrospectively included data from 34 chemonaïve patients with mCRPC who had received AA at some point between January 2017 and December 2018. We separated patients into two study arms according to the decrease in PSA percentages after use of AA for 3 months. We correlated PSA kinetics parameters with response and compared the two study groups with respect to PSA kinetics. Results: The patients’ median age was 77 years. In the total group of patients, 64% had a response to AA, whereas 35% did not. The ratio of the PSA level at nadir to the level during ADT was significantly higher in the AA-sensitive group (19.78 vs. 1.03, p=0.019). Conclusions: Patients who experienced a dramatic change in PSA level during ADT were more likely to be resistant to AA after progression to mCRPC. Chemotherapy rather than AA might be more suitable as a first-line treatment for these patients.
Chung-Liang Chang,Ho-Nien Shou,Jyh-Ching Juang 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper utilizes a novel evolutionary approach to proceed with signal acquisition in Global Navigation Satellite Systems (GNSS). The method controls search space bound of frequency shift and code delay to shorten signal acquisition time. Simulation results show that the proposed scheme can acquire more accurate signal parameters and take less signal acquisition time than the traditional method.
Chung-Liang Chang,Hsunling Bai,Yu-Huei Liu,Yu-Chih Lin 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.4
Manganese oxides (MnOx) were prepared by spray pyrolysis methods (MnS) and calcination at 600 and 1,000℃ (Mn600 and Mn1000) in this study. Further, the efficiencies of oxidizing isopropanol (IPA) by these MnOx utilizing ozone (OZCO) and thermal catalytic oxidation (TCO) were compared. The results indicated that MnS, which are characterized by larger surface areas, processed gas hourly space velocity of 42,000 h−1 and inlet IPA concentration of 400 ppm performing IPA decomposition efficiencies approaching 100%, and the reaction temperature was operated at only 85℃ for OZCO. The reaction temperature of TCO operated above 270℃ decomposed IPA at the same efficiency.
Effect of Array Configurations on the Performance of GNSS Interference Suppression
Chung-Liang Chang,Jyh-Ching Juang 대한전기학회 2008 International Journal of Control, Automation, and Vol.6 No.6
This paper analyzes, through simulations, GNSS interference mitigation performance against wideband and narrowband interferences by using spatial-temporal adaptive processing (STAP). The mathematical analysis results demonstrate that the array configuration has a considerable effect on the spatial-temporal correlation function. Based on the results, different array configurations are presented to evaluate and observe the effect on interference mitigation. The analysis results are further assessed through simulations.