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Development of a magnified flexure mechanism for fast tool servo system
Lu Hong(여굉),Soo Chang Choi(최수창),Yong Woo Kim(김용우),Jin Geun Kim(김진근),Deug Woo Lee(이득우) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
The flexure-hinge mechanisms are commonly used in the design of translational micro/nano-positioning stage. This paper presents the methodology for design and control of a lever-type magnified flexure mechanism used for the ultra-precision fast tool servo (FTS) system. A lever type hinge mechanism is designed and utilized to guide the tool stage and to preload the PZT actuator. A prototype of the FTS system was developed and tested. The influence of tile PZT actuator's capacitance on the output voltage of the given amplifier was investigated. The motion range of the FTS system can reach 11.3㎛ and a bandwidth of 600㎐, and the amplification of the lever flexure mechanism is approximately 5 as calculated from the experiment.
Hong-xia Lu,Man He,Yuan-yuan Liu,Jing-fei Guo,Li-wei Zhang,Deliang Chen,Hai-long Wang,Hong-liang Xu,Rui Zhang 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.5
Glass-ceramic glazes have been prepared successfully via crystallization from blast-furnace slag (BFS), fly ash (FA) fluxed with potash feldspar and borax. The crystalline behavior of glass-ceramic glazes was investigated using differential thermal analysis and thermogravimetric analysis (DTA/TG), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results revealed that the major crystalline phases are anorthite (CaAl2Si2O8) and akermanite (Ca2MgSi2O7) and crystalline phases disperse well in glassy phases with a uniform size of 1 μm. Glass-ceramic glazes possess low density, low water absorption,perfect stain resistance, acid resistance and alkali resistance. The thermal expansion coefficient of glass-ceramic glazes is steady up to 800 oC with an average value of 7.2 × 10−6 /K. Final results suggest that BFS and FA have potential to be vitrified into economically and environmentally low-cost glass-ceramic glaze materials.
Lu-Lu Zhang,Guo-Hong Li,Yi-Yang Li,Zhen-Yu Qi,Ai-Hua Lin,Ying Sun 대한암학회 2019 Cancer Research and Treatment Vol.51 No.3
Purpose The incidence, risk factors and survival impact of secondary primary malignancies (SPMs) among survivors of nasopharyngeal carcinoma (NPC) treated with definitive intensity-modulated radiation therapy (IMRT) with or without chemotherapy are poorly characterized. Materials and Methods Consecutive patients (n=6,377) from the big-data intelligence platform at Sun Yat-sen University Cancer Center, China (in a high-incidence area) with newly diagnosed non-metastatic pathologically proven non-keratinizing undifferentiated NPC treated with IMRT±chemotherapy between January 2003 and June 2013 were retrospectively analyzed. Cumulative incidence of SPMs was calculated using the Kaplan-Meier method. Cox proportional hazards model was used to identify potential risk factors for SPMs and assess whether SPMs affect overall survival. Results Of the 6,377 patients, 189 (3.0%) suffered SPMs (median follow-up, 62 months). One-, 2-, 3-, 4-, and 5-cumulative risks of SPMs were 0.4%, 0.9%, 1.6%, 2.2%, and 2.6%, respectively. Latency from start of IMRT to SPMs diagnosis was 37 months (range, 6 to 102 months). In patients with SPMs, 14.3% suffered SPMs within 1 year post-IMRT: 1-3 years, 38.1%; 3-5 years, 33.9%; and > 5 years, 13.7%. Lung cancer was the most common SPM (50/6,377, 0.78%). Multivariate analysis demonstrated sex (male, 64% increase), age (! 50 years, 68% increase), and smoking history (41% increase) were significant risk factors for SPMs, and SPMs were associated with poorer overall survival. Conclusion This large cohort study confirms SPMs a dreadful complication for long-term survivors of NPC treated with IMRT. SPMs negatively impact overall survival in NPC. Close follow-up is recommended for older male survivors with a smoking history.
Hong, Joon Ki,Lee, Eun Young,Jin, Zheng Lu,Kim, Ho Il,Hong, Jong Chan,Choi, Young Ju,Yun, Dae-Jin,Lee, Sang Yeol,Bahk, Jeong Dong,Cho, Moo Je,Lim, Chae Oh 한국유전학회 2002 Genes & Genomics Vol.24 No.4
A cDNA encoding a small GTP-binding protein highly similar to Arabidopsis ADP-ribosylation factor 3 (ARF3) was isolated from the Chinese cabbage flower bud cDNA library. The cDNA clone contained an open reading frame encoding a 182-amino acid polypeptide with a calculated molecular mass of 20.3 kDa. A multialignment and phylogenetic analysis demonstrated that all the plant genes evaluated were clustered in a major evolutionary tree branch, indicating the need for a new plant ADP-ribosylation factor (ARF) and ARF-like protein (ARL) subfamily classification. Several ARF or ARL genes were identified in Chinese cabbage genomic DNA by Southern analysis. ARL transcript levels, differentially expressed in different organs of the Chinese cabbage, were particularly high in the leaves. Accumulation of ARL transcript was nearly constant in seedlings treated with growth regulators. However, the ARL transcript was preferentially expressed in suspension culture cells following salicylic acid (SA) treatment but not following treatment with hydrogen peroxide (H_20_2), jasmonic acid (JA), or nitric oxide (NO). Thus, a SA signaling pathway may regulate ARL expression in Chinese cabbage suspension culture cells.
Body water percentage from childhood to old age
( Hong Lu ),( Eric Ayers ),( Pragnesh Patel ),( Tej K. Mattoo ) 대한신장학회 2023 Kidney Research and Clinical Practice Vol.42 No.3
Background: Total body water (TBW) increases with growth, but the body water percentage (TBW%) decreases with aging. The objective of our study was to delineate TBW% in males and females by bioelectrical impedance analysis (BIA) from early childhood to old age. Methods: We enrolled 545 participants aged 3 to 98 years (258 male, 287 female). Among the participants, 256 had a normal weight and 289 were overweight. The TBW was measured by BIA, and TBW% was derived by dividing the TBW (L) value by body weight (kg). For analysis, we divided participants into the four age groups of 3-10, 11-20, 21-60, and ≥61 years. Results: In normal-weight subjects, the TBW% was similar at 62% between males and females in the 3-10-year group. It remained unchanged in males until and through adult life, then decreased to 57% in the ≥61-year group. In normal-weight female subjects, the TBW% decreased to 55% in the 11-20-year group, remained relatively unaltered in the 21-60-year group, then decreased to 50% in the ≥61-year group. In overweight subjects, the TBW% values in males, as well as females, were significantly lower as compared to those with normal weight. Conclusion: Our study showed that the TBW% in normal-weight males changes very little from early childhood to adult life compared to that of females, who showed a decrease in TBW% during the pubertal years. In normal-weight subjects of both sexes, the TBW% decreased after the age of 60 years. Overweight subjects had significantly lower TBW% as compared to those with normal weight.
Esophageal/Gastric Cancer Screening in High-risk Populations in Henan Province, China
Lu, Yu-Fei,Liu, Zhi-Cai,Li, Zhong-Hong,Ma, Wen-Hao,Wang, Fu-Rang,Zhang, Ya-Bing,Lu, Jian-Bang Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.3
Objective: To summarize the endoscopic screening findings in high-risk population of esophageal and gastric carcinoma and analyze influential factors related to screening. Methods: In seven selected cities and counties with high incidences of esophageal carcinoma, people at age of 40-69 were set as the target population. Those with gastroscopy contradictions were excluded, and all who were voluntary and willing to comply with the medical requirements were subjected to endoscopic screening and histological examination for esophageal, gastric cardia and gastric carcinoma in accordance with national technical manual for early detection and treatment of cancer. Results: In three years, 36,154 people were screened, and 16,847 (46.60%) cases were found to have precancerous lesions. A total of 875 cases were found to have cancers (2.42%), and among them 739 cases had early stage with an early diagnosis rate is 84.5%. Some 715 patients underwent prompt treatment and the success rate was 81.8%. Conclusions: In a high-risk population of esophageal and gastric carcinoma, it is feasible to implement early detection and treatment by endoscopic screening. Screening can identify potential invasive carcinoma, early stage carcinoma and precancerous lesions, improving efficacy through early detection and treatment. The exploratory analysis of related influential factors will help broad implementation of early detection and treatment for esophageal and gastric carcinoma.