센서구동 방식에 의한 태양추적 시스템

박정국,최연옥,조금배,최창주 조선대학교 에너지.자원신기술연구소 2004 에너지·자원신기술연구소 논문지 Vol.26 No.2

Nowaday, almost of practical energy comes from the fossil fuel, such as coal, oil and gas. But those methode causes the environmental pollution. Photovoltaic systems are considered as a alternative energy source to overcome the shortage of electricity in the future. Photovoltaic system is easier to operate and maintain than the other power generating system since it generally contains no moving parts, operate silently and require very little maintenance. In this paper, it is proposed 150[W] solar tracking system, the system designed as the normal line of the solar cell always runs parallel the ray of the sun. This design can minimize the cosign loss of the system.

Investigation on the influence of number of blades on flow-induced noise optimization design of a centrifugal pump

Chang Guo,Feiran Lv,Ming Gao,Wei Wei,Shen Cheng 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10

Aiming at the quiet centrifugal pump design, the effect of number of blades on the flow-induced noise is explored. The results show that the sound pressure fluctuation is generated due to the influence of sound source fluctuation and adjacent spatial locations, and the fluctuation ranges of sound source and sound pressure at the same location change little with the change in the number of blades. Additionally, the total sound source intensity increases along the flow direction in the volute under the same rotational radius, while it increases slowly and even decreases near the outlet of the impeller, which causes similar evolution characteristics of noise. Besides, the volume-weighted standard deviation of sound source (V-STDSS) is proposed to characterize the overall sound intensity, and the V-STDSS proportion of impeller is more than 0.6. The impeller with an even number of blades has a better sound performance, while the noise induced by volute with an odd number of blades is lower. Generally, the centrifugal pumps with an even number of blades have a better sound performance. This research can guide the noise control and optimization design of centrifugal pumps.

The NQO1 rs1800566 Polymorphism and Risk of Bladder Cancer: Evidence from 6,169 Subjects

Guo, Zhan-Jing,Feng, Chang-Long Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.12

Objective: The NAD(P)H:quinone oxidoreductase 1 (NQO1) rs1800566 polymorphism, leading to proline-toserine amino-acid and enzyme activity changes, has been implicated in bladder cancer risk, but individually published studies showed inconsistent results. We therefore here conducted a meta-analysis to summarize the possible association. Methods: A systematic literature search up to August 27, 2012 was carried out in PubMed, EMBASE and Wanfang databases, and the references of retrieved articles were screened. Crude odds ratios (ORs) with 95% confidence intervals (CIs) were analyzed for homozygote contrast (TT vs. CC), additive model (T vs. C), dominant model (TT+CT vs. CC), and recessive model (TT vs. CC+CT) to assess the association using fixed- or random-effect models. Results: We identified 12 case-control studies including 3,041 cases and 3,128 controls for the present meta-analysis. Significant association between NQO1 rs1800566 genetic polymorphism and risk of bladder cancer was observed in the additive model (OR = 1.15, 95% CI = 1.01-1.30, p = 0.030). Moreover, in the subgroup analysis stratified by ethnicity, significant associations were observed in Asians (OR = 1.26, 95% CI = 1.08-1.47, p = 0.003 for T vs. C; OR = 1.68, 95% CI = 1.21-2.32, p = 0.002 for TT vs. CC; OR = 1.50, 95% CI = 1.13-1.98, p = 0.005 for TT vs. CT+CC) but not in Caucasians. Conclusions: The results suggest that NQO1 rs1800566 genetic polymorphism may contribute to bladder cancer development, especially in Asians.

Association Between C-reactive Protein and Risk of Cancer: A Meta-analysis of Prospective Cohort Studies

Guo, Yong-Zhong,Pan, Lei,Du, Chang-Jun,Ren, Dun-Qiang,Xie, Xiao-Mei Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.1

Background: Associations between elevated C-reactive protein (CRP) and cancer risk have been reported for many years, but the results from prospective cohort studies remains controversial. A meta-analysis of prospective cohort studies was therefore conducted to address this issue. Methods: Eligible studies were identified by searching the PubMed and EMBASE up to October 2012. Pooled hazard ratios (HR) was calculated by using random effects model. Results: Eleven prospective cohort studies involving a total of 194,796 participants and 11,459 cancer cases were included in this meta-analysis. The pooled HR per natural log unit change in CRP was 1.105 (95% confidence interval (CI): 1.033-1.178) for all-cancer, 1.308 (95% CI: 1.097-1.519) for lung cancer, 1.040 (95% CI: 0.910-1.170) for breast cancer, 1.063 (95% CI: 0.965-1.161) for prostate cancer, and 1.055 (95% CI: 0.925-1.184) for colorectal cancer. Dose-response analysis showed that the exponentiated linear trend for a change of one natural log unit in CRP was 1.012 (95% CI: 1.006-1.018) for all-cancer. No evidence of publication bias was observed. Conclusions: The results of this meta-analysis showed that the elevated levels of CRP are associated with an increased risk of all-cancer, lung cancer, and possibly breast, prostate and colorectal cancer. The result supports a role of chronic inflammation in carcinogenesis. Further research effort should be performed to identify whether CRP, as a marker of inflammation, has a direct role in carcinogenesis.

PLCE1 Gene in Esophageal Cancer and Interaction with Environmental Factors

Guo, Li-Yan,Zhang, Shen,Suo, Zhen,Yang, Chang-Shuang,Zhao, Xia,Zhang, Guo-An,Hu, Die,Ji, Xing-Zhao,Zhai, Min Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.7

Objective: To study the PLCE1 gene rs2274223 polymorphism with regard to esophageal cancer and its interaction with diet, lifestyle, psychological and environmental factors in Southwest Shandong province. Materials and Methods: A case series study (case-case) was conducted. Questionnaire data were collected and 3 ml-5ml venous blood was drawn for DNA extraction among the qualified research subjects. PLCE1 gene polymorphism was detected after PCR amplification of DNA. SPSS 13.0 software was used for statistical analysis of the data. Results: The three genotypes A/A, A/G and G/G PLCE1 gene rs2274223 was 31, 16 and 4 cases, accounting for 60.8%, 31.4%, 0.08% respectively. The difference of three genotypes (AA/GA/GG) proportion between negative and positive family history of patients was statistically significant, ${\chi}^2=6.213$, p=0.045. There was no statistically significant relationship between PLCE1 gene rs2274223 polymorphism and smoking, drinking, ${\chi}^2=0.119$, p=0.998, and ${\chi}^2=1.727$, p=0.786. There was no linkage of the three rs2274223 PLCE1 gene genotypes (AA/GA/GG) proportion with eating fried, pickled, hot, mildew, overnight, smoked, excitant food, eat speed, salt taste or not (p>0.05). or with living environment pollution and nine risk factors of occupational exposure (p>0.05). There was no statistically significant difference in TS scores between different genotype of rs2274223 PLCE1 gene. Conclusions: The PLCE1 rs2274223 polymorphism has a relationship with family history of esophageal cancer, but does not have any significant association with age, gender, smoking, alcohol drinking, food hygiene, eating habits, living around the environment and occupation in cases.

Changes in fermentation pattern and quality of Italian ryegrass (Lolium multiflorum Lam.) silage by wilting and inoculant treatments

Liu, Chang,Zhao, Guo Qiang,Wei, Sheng Nan,Kim, Hak Jin,Li, Yan Fen,Kim, Jong Geun Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.1

Objective: This study was conducted to investigate the effects of wilting and microbial inoculant treatment on the fermentation pattern and quality of Italian ryegrass silage. Methods: Italian ryegrass was harvested at heading stage and ensiled into vinyl bags (20 cm×30 cm) for 60d. Italian ryegrass was ensiled with 4 treatments (NWNA, no-wilting noadditive; NWA, no-wilting with additive; WNA, wilting no-additive; WA, wilting with additive) in 3 replications, wilting time was 5 hours and additives were treated with 106 cfu/g of Lactobacillus plantarum. The silages samples were collected at 1, 2, 3, 5, 10, 20, 30, 45, and 60 days after ensiling and analyzed for the ensiling quality and characteristics of fermentation patterns. Results: Wilting treatment resulted in lower crude protein and in vitro dry matter digestibility and there were no significant differences in acid detergent fiber (ADF), total digestible nutrient (TDN), water-soluble carbohydrate (WSC), ammonia content, and pH (p>0.05). However, wilting treatment resulted in higher ADF and neutral detergent fiber content of Italian ryegrass silage (p<0.05), and the WNA treatment showed the lowest TDN and in vitro dry matter digestibility. The pH of the silage was higher in the wilting group (WNA and WA) and lower in the additive treatment group. Meanwhile, the decrease in pH occurred sharply between the 3-5th day of storage. The ammonia nitrogen content was significantly lower in the additive treatment (p<0.05), and wilting had no effect. As fermentation progressed, the lactic and acetic acid contents were increased and showed the highest content at 30 days of storage. Conclusion: The wilting treatment did not significantly improve the silage fermentation, but the inoculant treatment improved the fermentation patterns and quality of the silage. So, inoculation before ensiling is recommended when preparing high quality of Italian ryegrass silage, and when wilting, it is recommended to combine inoculation for making high quality silage.

AN OCTREE ENVIRONMENT MODELING ALGORITHM APPLIED TO ROBOT PATH PLANNING

Chang, Gu Guo,Liang, Liu Dong,Rong, Li 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1

In this paper, we propose an Octree Environment Modeling Algorithm, which is based on clipping technique. The executive process of the algorithm, especially the solution of fault-judgement problem, is discussed. This algorithm has been implemented in TURBO C and applied to the system of 3-D Path Planning for AUV (Autonomous Underwater Vehicle). The experimental results are satisfactory.

Acupotomy for scapulohumeral periarthritis

Chang-qing Guo,Shi Ning Ma,Xin Yi Fu,Quan Gui Wang,Mira Lee 대한침구의학회 2020 대한침구의학회지 Vol.37 No.4

Background: Scapulohumeral periarthritis causes pain and stiffness, and limits movement but it is a treatable condition. This was a clinical study of acupotomy treatment for scapulohumeral periarthritis. Methods: There were 80 patients randomly assigned to the traditional Chinese Medicine group (acupotomy) and the Western medicine group (naproxen), with 40 cases in each group. All patients had adjunct physiotherapy exercises for 14 days. Patients received acupotomy treatment 3 times for 14 days (Day 0, 7 and 14) or naproxen (0.22 g capsule; a non-steroidal anti-inflammatory drug) 3 times a day, for 14 days. The visual analogue scale (VAS) scores, range of motion (ROM) values, and the Melle scale, together with the therapeutic standard of diseases and syndromes in traditional Chinese Medicine were used for diagnosis and evaluation. Results: There were significant differences in the VAS scores, ROM, Melle scores, cure rate and total effective rate in the group which took naproxen and the acupotomy group, before and after treatment (p < 0.01). There were significant differences in the changes in VAS, ROM and Melle scores between the 2 groups (p < 0.01), and the acupotomy group was better than the naproxen group. Conclusion: Traditional Chinese Medicine and Western medicine can improve functional activity and reduce the level of pain experienced by patients suffering from scapulohumeral periarthritis. However, improvement of functional activity of the shoulder joint following acupotomy treatment was more obvious than the use of a non-steroidal anti-inflammatory drug, and the cure rate, and total effective rate of acupotomy was better.

《左傳》夢驗古事中的血緣宗族觀念

과상보 ( Chang Bao Guo ) 中國語文硏究會 2004 中國語文論叢 Vol.0 No.27

Simultaneous distillation-extraction for manufacturing ultra-high-purity electronic-grade octamethylcyclotetrasiloxane (D4)

Wenhui Guo,Shuhu Guo,Xu Zhao,Zhenjun Yuan,Yu Zhao,Xin Chang,Hong Li,Xiong Zhao,Ye Wan,Dazhou Yan,Zhongyuan Ren,Xiaolei Fan,Xin Gao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-

Ultra-high-purity (UHP) electronic-grade octamethylcyclotetrasiloxane (D4) is the key precursor of lowdielectricconstant (low-k) SiCOH films to manufacture integrated circuits (IC), meeting the stringentrequirements of the rapidly developing semiconductor industry. Commonly, metallic impurities in D4were removed by multiple unit operations of adsorption, filtration, and distillation, which could reducethe concentration of a single metallic impurity below 1 ppb. However, D4 with higher purity is requiredby semiconductor production due to an increase in transistor density. Herein, a novel method based onthe integrated simultaneous distillation–extraction (SDE) was developed for manufacturing UHPelectronic-grade D4. The lab and pilot scale experiments showed that the purity of water and D4 has apositive correlation. Based on the experimental data, a double-column process, consisting of azeotropic/extractive distillation column and precision distillation column with UNIQUAC method, was establishedto access the feasibility of scaling up the SDE process. According to the simulation results, D4with the purity > 99.999 wt.% and total metallic impurities (TMI) content below 1 ppb could be obtainedusing ultra-pure water.