단지계획

Lynch, Kevin 대한지방행정공제회 1973 도시문제 Vol.8 No.6

A n-dimensional Convex Hull Approach for Fault Detection and Mitigation for High Degree of Freedom Robots Humanoid Robots

Kevin Lynch,Daniel M. Lofaro,Paul Oh 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10

This work shows a plan for error state determination, diagnosis, and mitigation using autonomic computing tools and tecniques on the Hubo robot. An n-dimensional geometric enclosure is constructed from periodic measurements of the robot’s normal operating state. Similar hulls will be constructed for unique faults encountered during runtime. A mapping of these faults to applicable mitigations will be dynamically constructed and will aid in mitigation selection. The successful application of the mitigation will bring the robot back to a safe operating state.

Enhancement of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ durability and surface electrocatalytic activity by La_0.85Sr_0.15MnO_3±δ investigated using a new test electrode platform

Lynch, Matthew E.,Yang, Lei,Qin, Wentao,Choi, Jong-Jin,Liu, Mingfei,Blinn, Kevin,Liu, Meilin Royal Society of Chemistry 2011 ENERGY AND ENVIRONMENTAL SCIENCE Vol.4 No.6

<P>A carefully designed test cell platform with a new electrode structure is utilized to determine the intrinsic surface catalytic properties of an electrode. With this design, the electrocatalytic activity and stability of an La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3−δ</SUB> (LSCF) cathode is enhanced by a dense thin La<SUB>0.85</SUB>Sr<SUB>0.15</SUB>MnO<SUB>3±δ</SUB> (LSM) coating, suggesting that an efficient electrode architecture has been demonstrated that can make effective use of desirable properties of two different materials: fast ionic and electronic transport in the backbone (LSCF) and facile surface kinetics on the thin-film coating (LSM). Theoretical analyses suggest that the enhanced electrocatalytic activity of LSM-coated LSCF is attributed possibly to surface activation under cathodic polarization due to the promotion of oxygen adsorption and/or dissociation by the surface layer and the dramatically increased oxygen vacancy population in the surface film. Further, the observed time-dependent activation over a few hundreds of hours and durability are likely associated with the formation of a favorable hybrid surface phase intermediate between LSM and LSCF. This efficient electrode architecture was successfully applied to the state-of-the-art LSCF-based cathodes by a simple solution infiltration process, achieving reduced interfacial resistance and improved stability under fuel cell operating conditions.</P> <P>Graphic Abstract</P><P>A La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3−δ</SUB> (LSCF) cathode coated with a thin, continuous La<SUB>0.85</SUB>Sr<SUB>0.15</SUB>MnO<SUB>3±δ</SUB> (LSM) layer demonstrated reduced resistance to oxygen reduction reactions while enhancing the stability at intermediate temperatures for SOFC operation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1ee01188j'> </P>

Tetrathiafulvalene-annulated [28]hexaphyrin(1.1.1.1.1.1): a multi-electron donor system subject to conformational control

Jana, Atanu,Ishida, Masatoshi,Cho, Kevin,Ghosh, Sudip Kumar,Kwak, Kyuju,Ohkubo, Kei,Sung, Young Mo,Davis, Christina M.,Lynch, Vincent M.,Lee, Dongil,Fukuzumi, Shunichi,Kim, Dongho,Sessler, Jonathan L. The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.79

<P>Tetrathiafulvalenes (TTF)-annulated [28]hexaphyrin affords an electron rich flexible π-conjugated system whose limiting conformations can be controlled through choice of solvents. The conformation-dependent intramolecular charge transfer character, as well as electron reserve capability of the hexakis-TTF annulated hexaphyrin, was analyzed.</P> <P>Graphic Abstract</P><P>A flexible π-electron conjugated macrocycle (hexaphyrin) core with six redox active TTF fragments has been developed. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc44934c'> </P>

Validation of Neck Disability Index Severity among Patients Receiving One or Two-Level Anterior Cervical Surgery

Geoghegan Cara E.,Mohan Shruthi,Lynch Conor P.,Cha Elliot D. K.,Jacob Kevin C.,Patel Madhav R.,Prabhu Michael C.,Vanjani Nisheka N.,Pawlowski Hanna,Singh Kern 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.1

Study Design: Retrospective cohort. Purpose: To evaluate the validity of established severity thresholds for Neck Disability Index (NDI) among patients undergoing anterior cervical discectomy and fusion (ACDF) or cervical disc arthroplasty (CDA). Overview of Literature: Few studies have examined the validity of established NDI threshold values among patients undergoing ACDF or CDA. Methods: A surgical database was reviewed to identify patients undergoing cervical spine procedures. Demographics, operative characteristics, comorbidities, NDI, Visual Analog Scale (VAS), and 12-item Short Form (SF-12) physical and mental composite scores (PCS and MCS) were recorded. NDI severity was categorized using previously established threshold values. Improvement from preoperative scores at each postoperative timepoint and convergent validity of NDI was evaluated. Discriminant validity of NDI was evaluated against VAS neck and arm and SF-12 PCS and MCS. Results: All 290 patients included in the study demonstrated significant improvements from baseline values for all patient-reported outcome measures (PROMs) at all postoperative timepoints (p<0.001) except SF-12 MCS at 2 years (p=0.393). NDI showed a moderate-to-strong correlation (r≥0.419) at most timepoints for VAS neck, VAS arm, SF-12 PCS, and SF-12 MCS (p<0.001, all). NDI severity categories demonstrated significant differences in mean VAS neck, VAS arm, SF-12 PCS, and SF-12 MCS at all timepoints (p<0.001, all). Differences between NDI severity groups were not uniform for all PROMs. VAS neck values demonstrated significant intergroup differences at most timepoints, whereas SF-12 MCS showed significantly different values between most severity groups. Conclusions: Neck disability is strongly correlated with neck and arm pain, physical function, and mental health and demonstrates worse outcomes with increasing severity. Previously established severity categories may be more applicable to pain than physical function or mental health and may be more uniformly applied preoperatively for cervical spine patients.

Change in Patient-Reported Outcome Measures as Predictors of Revision Lumbar Decompression Procedures

Michael T. Nolte,Elliot D.K. Cha,Conor P. Lynch,Kevin C. Jacob,Madhav R. Patel,Cara E. Geoghegan,Caroline N. Jadczak,Shruthi Mohan,Kern Singh 대한척추신경외과학회 2021 Neurospine Vol.18 No.4

Objective: To assess change in Patient-Reported Outcome Measures (PROM) as predictors for revision lumbar decompression (LD). Methods: Patients who underwent primary, single or multilevel LD were retrospectively reviewed. Patients were categorized according to whether or not they underwent revision LD within 2 years of the primary procedure. Visual analogue scale (VAS), Oswestry Disability Index (ODI), 12-item Short Form Health Survey and 12-item Veterans RAND physical component score (SF-12 PCS and VR-12 PCS), and Patient-Reported Outcome Measurement Information System physical function (PROMIS-PF) were recorded. Delta PROM scores were evaluated for differences between groups and as a risk factor for a revision LD. Results: The study included 135 patients, 91 undergoing a primary procedure only and 44 undergoing a primary and revision procedure. Matched patients did not demonstrate any significant differences in demographics or perioperative characteristics. Patients who underwent a revision had a mean time to revision of 7.4±5.7 months. Primary cohort significantly improved for all PROMs (all p<0.05), while the primary plus revision cohort significantly improved for VAS back, ODI, and PROMIS-PF (all p<0.05). However, cohorts differed in VAS back and PROMIS-PF (p<0.05). Delta PROMs were not a significant risk factor for revision except at 6 months for PROMIS-PF (p=0.024). Conclusion: LD has been associated with reliable outcomes, but early identification of patients at risk for revision is critical. This study suggests that tools such as PROMIS-PF may serve a role in predicting who is at risk and the 6-month follow-up period may be valuable for counseling patients who are not experiencing improvement.