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Workspace analysis of 3-CPS parallel micro-manipulator for mirror active adjusting platform
Gang Cheng,Bing-jing Qiu,De-hua Yang,Hou-guang Liu 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.12
In order to adjust telescope mirrors with high precision, a 3 cylindrical-prismatic-spherical (CPS) parallel micro-manipulator with 6 degrees-of-freedom (DOF) and partial decoupling is proposed. Structure characteristics of the micro-manipulator were analyzed and the kinematic equations were derived based on Euler method. To avoid tedious derivation, Jacobian matrix with screw theory representing the input and output relation of micro-manipulator is established by using velocity influence coefficient method. Combining topological structure characteristics of the 3-CPS parallel micro-manipulator, the solving procedures of workspace are obtained. Moreover, the position workspace with a given orientation and the orientation workspace with a given translation position are constructed by numerical simulations. The workspace range is chosen as the optimization goal of structure parameters, and the circumcircle radius ratio of base and moving platform and the lengths of each sub-link are optimized. The maximum condition number and the minimum singular value are chosen as the precision indexes to analyze the precision performance of the workspace. Then, the properties of the position workspaces with various orientations and the orientation workspaces with various positions are simulated numerically, and the simulation results prove that the 3-CPS parallel micro-manipulator has an ability to achieve high precision operations. This research provides a workspace modeling and optimization method for the practical application in telescope mirror adjustment or other fields requiring high precision.
이미라,Jing Gang Hou,Shahnaz Begum,Jian Jie Xue,Yun Bo Wang,성창근 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.6
This study evaluates three edible mushrooms:Lentinus edodes, Sparassis crispa, and Mycoleptodonoidesaitchisonii, in terms of acetylcholinesterase (AChE)inhibition, antioxidant potency and constituents free aminoacids and mineral. The concentration of essential aminoacids was found to be 34.10 mg/g in M. aitchisonii, 26.25mg/g in S. crispa, 25.99 mg/g in L. edodes. S. crispadisplayed the highest DPPH scavenging activity andphenolic contents. The best results for AChE inhibitionwere obtained from M. aitchisonii. These results suggestthat M. aitchisonii has high potential for cognitiveimprovement by AChE inhibition and antioxidant potency.
Anti-obesity Effects of Sparassis crispa on High-fat Diet-induced Obese Mice
Mi Ra Lee(이미라),Jing Gang Hou(하지강),Shahnaz Begum(샤나즈베검),Yun Bo Wang(왕운보),Deuk Sil Oh(오득실),An Jin Wi(위안진),Byung Sun Yoon(윤병선),Chang Keun Sung(성창근) 한국생명과학회 2014 생명과학회지 Vol.24 No.9
본 연구는 고지방식이로 유도한 비만 흰쥐에 대한 꽃송이 버섯의 항비만 효과를 관찰하였다. 6주령 수컷C57BL/6 마우스를 이용하여 칼로리의 45%를 지방으로 구성한 고지방식이를 이용하여 비만을 유도하였으며, 대조군은 정상식이를 제공하였다. 처리군은 고지방 식이에 꽃송이 버섯 분말을 1%, 3%, 5% 수준으로 첨가하여 12주간 제공하였다. 체중, 식이섭취, 장기무게, 내장지방, 혈청지질, 변무게 및 변지방, 간지방, 조직병리실험을 실시하였다. 고지방식이 섭취군은 체중, 식이섭취, 피하지방 및 복막하지방, 혈청 콜레스테롤 및 중성지방농도, 변지방, 간지방, 부고환지방 조직의 지방세포 크기가 증가하였다. 그러나 고지방식이에 꽃송이 버섯 분말을 첨가한 실험군에서는 체중증가, 식이섭취 및 식이효율, 간 콜레스테롤 함량, 내장지방 무게가 꽃송이 버섯 첨가량에 따라 감소하였다. 특히, 5% 꽃송이버섯 첨가군은 간세포의 지방축적과 지방간 현상이 현저히 개선되었으며, 부고환 지방조직에서의 지방세포 크기도 현저히 감소하였다. 본 연구결과를 통하여 볼 때, 꽃송이 버섯은 뛰어난 항비만 효과를 가지고 있어, 비만 조절을 위한 기능성 식품으로의 이용이 가능할 것으로 사료된다. The present study investigated the anti-obesity effects of Sparassis crispa (SC) on mice fed a high-fat (HF, 45 kcal% fat) diet. Mice were fed either a normal control diet and an HF diet or an HF diet supplemented with SC (1%, 3%, and 5%) for 12 weeks. The consumption of an HF diet compared to the NC group resulted in increases in body weight, the food efficiency ratio (FER), retroperitoneal and subcutaneous fat weights, cholesterol and triglyceride levels, fecal fat, and liver lipids. However, the administration of SC significantly decreased body weight gain, food intake, FER, cholesterol and triglyceride levels, and liver lipids in a dose-dependent manner. In particular, treatment with 5% SC significantly reduced the occurrence of fatty liver deposits and steatosis, which are associated with the increased adipocyte size in mice fed an HF diet. Therefore, these results suggested that dietary supplementation with SC exerts anti-obesity effects and could be used as a functional food to control obesity.
MUTYH Association with Esophageal Adenocarcinoma in a Han Chinese Population
Kong, Feng,Han, Xue-Ying,Luan, Yun,Qi, Tong-Gang,Sun, Chao,Wang, Jue,Hou, Hua-Ying,Jiang, Yu-Hua,Zhao, Jing-Jie,Cheng, Guang-Hui Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11
Adenocarcinoma of esophagus (AE) is a complex disease, affected by a variety of genetic and environmental factors. Much evidence has shown that the MutY glycosylase homologue (MUTYH) plays a key role in the pathogenesis of many cancers. However, there have been no reports on influence on AE in the Han Chinese population. The objective of this study was to investigate this issue. A gene-based association study was conducted using three single nucleotide polymorphisms(SNPs) reported in previous studies. The three SNPs (rs3219463, rs3219472, rs3219489) were genotyped in 207 unrelated AE patients and 249 healthy controls in a case-control study using polymerase chain reaction and restriction fragment length polymorphism (PCR-RFLP). The results revealed that the genotype distribution of rs3219472 differed between the case and control groups (OR=1.66,95%CI=1.11-2.48, P=0.012), indicating that an association may exist between MUTYH and AE. These findings support a signifcant role for MUTYH in AE pathogenesis in the Han Chinese population.