E-Performance Reporting: How Does it Perform?

( Yi Lu ),( Katherine G. Willoughby ) 한국행정학회 2012 한국행정학회 학술발표논문집 Vol.2012 No.-

Solving inertial wrench of parallel manipulators using CAD variation geome-try

Yi Lu 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.9

It has been a significant and challenging issue to solve the inertial wrench of parallel manipulators (PMs) for their dynamics analysis and control. A CAD variation geometry approach is proposed for solving the inertial wrench of PMs. First, an initial simulation mechanism of PM, and a simulation mechanism of PM with linear/angular velocity and acceleration are created. Second, when modifying the driving dimension of the active legs, the simulation mechanisms are varied correspondingly, the position, linear/angular velocity and acceleration of moving platform and legs, and inertial wrench of moving platform and legs are solved automatically and visualized dynamically. Third, a 3-DoF PM is illustrated, and the displacement, linear/angular velocity and acceleration, and inertial wrenches of the moving platform and legs are solved using CAD variation geometry and are verified by the analytic solutions. Finally, inertial wrenches of the legs are transformed onto the moving platform.

Using characteristic strings to derive valid contracted graphs with hexagonal links plus other links for type synthesis of closed mechanisms

Yi Lu,Yang Lu,Nijia Ye,Bingyi Mao,Chunping Sui,Jianda Han 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5

"It has been a significant and challenging issue to derive the complex valid contracted graphs (CGs) with hexagonal links plus other links and identify their isomorphism for creating novel closed mechanisms. This paper focuses on the derivation of the valid CGs with hexagonal links plus other links using the characteristic strings (CSs). First, the concepts on the CGs and CSs are explained, and the numbers of vertices and edges in the CGs are solved. Second, the relative criterion are determined for representing/deriving CGs and identifying isomorphic/invalid CGs by CSs. Third, some simple CGs are derived from some associated linkages with hexagonal links plus more other links, are represented by CSs, and the isomorphic/invalid CGs are identified using the CSs and the isomorphic queues of the links. Fourth, some examples are given for illustrating their applications. Finally, many complex valid CGs with more hexagonal links plus other links are represented and derived using CSs, and their isomorphism are identified using CSs."

NANOSEEDING EFFECT IN ZSM-5CRYSTALLIZATION PROCESS

YI LU,NAI-QIAN ZHANG,JIN-KU LIU,QIN TONG,DAN-JING HONG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.3

ZSM-5 zeolites were hydrothermally synthesized in three different seeding pathways under the direction of tetrapropylammonium bromide (TPABr) template. In order to investigate the seeding effect in ZSM-5 crystallization process, ZSM-5 crystals and pre-fabricated MFI-type nanoseeds were added into the original self-induction system, respectively. The final ZSM-5 zeolites were systematically investigated based on XRD (X-ray diffraction), SEM (scanning electron micrograph), TEM (transmission electron micrograph), nitrogen adsorption characterizations and NH3-TPD (ammonia-temperature programmed desorption). The self-induction system produced ca. 20 μm ZSM-5 zeolite displaying hexagonally uniform prisms. After the addition of ZSM-5 crystal seeds, the crystal sizes were decreased greatly to ca. 5 μm. When MFI-type nanoseeds were adopted, irregular aggregate particles consisting of 20–50 nm primary particles were rapidly synthesized. The varied hydrothermal crystallization kinetics of the three synthesis system was also explored. Adjusting the seed agents alone, ZSM-5 crystals with diverse structural, morphological, textural and hydrothermal behaviors could be fabricated conveniently. The three ZSM-5 zeolites loaded by 0.05 wt.% Pt were assessed for the xylene isomerization reaction to investigate the particle size effect on the catalytic properties.

Derivation and isomorphism identification of valid topological graphs for 1-, 2-DOF planar closed mechanisms by characteristic strings

Yi Lu,Bingyi Mao,Jianping Yu 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.1

A characteristic string approach is presented for derivation and isomorphism identification of valid topological graphs (TGs) for some 1, 2-DOF (degree of freedom) planar closed mechanisms from the contracted graphs (CGs). First, topological graph (TG) is simplified by the topology graph with digits (DTG) for the 1-, 2-DOF planar closed mechanisms. Second, the equivalent conditions between the characteristic string and DTG are determined and verified by some created simulation mechanisms of valid TGs, a complicated derivation of TG is transformed into an easy derivation of the characteristic string. Third, the valid characteristic strings are derived corresponding to non-isomorphic TGs, and the invalid characteristic strings corresponding to the isomorphic and invalid TGs are determined using the characteristic string. Finally, many valid characteristic strings for the 2-DOF planar mechanisms are derived from some valid characteristic strings for the 1-DOF planar mechanisms.

Dynamics analysis of 3-leg 6-DoF parallel manipulator with multi different-DoF finger mechanisms

Yi Lu,Nijia Ye,Peng Wang 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.3

A dynamics of a 3-leg 6-DoF parallel manipulator with multi different-DoF fingers is studied systematically. First, the unified kinematics formulae of the parallel manipulator with multi different-DoF fingers are established for solving the velocity/acceleration of the moving links of parallel manipulator and finger mechanisms and the Jacobian/Hessian matrices. Second, their unified dynamics formulae are established for solving the dynamic input wrench of the parallel manipulator and the finger mechanisms. Third, the special kinematics/dynamics formulae of a novel 6-DoF 3-UPS type parallel manipulator with three one-DoF finger mechanisms are derived for illustrating application of dynamics formulae. Finally, its analytic solutions are analyzed and verified by the simulation solutions.

Kinematics/statics analysis of a novel serial-parallel robotic arm with hand

Yi Lu,Zhuohong Dai,Nijia Ye,Peng Wang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10

A robotic arm with fingered hand generally has multi-functions to complete various complicated operations. A novel serial-parallel roboticarm with a hand is proposed and its kinematics and statics are studied systematically. A 3D prototype of the serial-parallel roboticarm with a hand is constructed and analyzed by simulation. The serial-parallel robotic arm with a hand is composed of an upper 3RPSparallel manipulator, a lower 3SPR parallel manipulator and a hand with three finger mechanisms. Its kinematics formulae for solving thedisplacement, velocity, acceleration of are derived. Its statics formula for solving the active/constrained forces is derived. Its reachableworkspace and orientation workspace are constructed and analyzed. Finally, an analytic example is given for solving the kinematics andstatics of the serial-parallel robotic arm with a hand and the analytic solutions are verified by a simulation mechanism.

ORiginal Article : Endoscopic Intervention through Endoscopic Retrograde Cholangiopancreatography in the Management of Symptomatic Pancreas Divisum: A Long-Term Follow-Up Study

( Yi Lu ),( Bin Xu ),( Lu Chen ),( Li Ke Bie ),( Biao Gong ) 대한간학회 2016 Gut and Liver Vol.10 No.3

Background/Aims: To evaluate the efficacy and safety of endoscopic retrograde cholangiopancreatography (ERCP) for the treatment of symptomatic pancreas divisum (PD) and to discuss whether ERCP procedures and outcomes in younger patients differ from those of adults. Methods: Symptomatic patients with PD were included in the study and divided into underaged (age ≤17 years) and adult (age ≥18 years) group. The clinical information of each patient was reviewed, and then the patients were contacted by telephone or their medical records were reviewed to determine their long-term followup outcomes. Results: A total of 141 procedures were performed in 82 patients (17 underaged and 65 adult patients). The ERCP indications included abdominal pain (39.02%), pancreatitis (12.20%), recurrent pancreatitis (36.59%), and other discomfort (12.20%). The endoscopic interventions included endoscopic pancreatic sphincterotomy in 44.68% of the patients, bouginage in 26.95%, pancreatic ductal stone extraction in 19.15%, endoscopic nasopancreatic drainage in 21.99%, and endoscopic retrograde pancreatic drainage in 56.74%. After a median follow-up of 41 months, the overall response rate was 62.32%. Between the underaged group and the adult group, significant differences were not observed in the ERCP procedures, complications and longterm follow-up results. Conclusions: ERCP is a safe and effective treatment for symptomatic PD. Based on the details, complications, and follow-up results, the ERCP procedure did not present differences between the underaged and adult groups. (Gut Liver 2016;10:476-482)

Anti-inflammatory Cembranoids from the Formosan Soft Coral Sinularia discrepans

Yi Lu,Huey-Jen Su,Yung-Husan Chen,Zhi-Hong Wen,Jyh-Horng Sheu,Jui-Hsin Su 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.8

A new cembranoid, discrepanolide A (1), along with four known cembranoids 2-5 were isolated from the Formosan soft coral Sinularia discrepans. The structures of these compounds were determined by analysis of spectroscopic data and by comparison of NMR data with those of known compounds. None of these compounds were found to be cytotoxic towards a limited panel of cancer cell lines. Compounds 3-5 were found to display significant in vitro anti-inflammatory activity in LPS-stimulated RAW264.7 macrophage cells by inhibiting the expression of the iNOS protein. Compound 5 also significantly inhibited the accumulation of pro-inflammatory COX-2 protein.

FACILE SYNTHESIS OF COPPER NANOPARTICLE CHAINS

YI LU,JIN-KU LIU,XIAO-JUN HU,JIN MU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.1

The copper nanoparticle chains have been synthesized through a self-assembly process with sodium polymethacylic acid as the template. The resulted nanoparticle chains were 0.8–1.5 μm long, and the composed nanoparticles were about 30 nm in diameter. The self-assembly formation mechanism has been proposed.