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10,854 results on '"Clark, W."'

4. A Study of the Long-Term Behavior of Hybrid Systems with Symmetries via Reduction and the Frobenius-Perron Operator

Author

Oprea, Maria, Shaw, Aden, Huq, Robi, Iwasaki, Kaito, Kassabova, Dora, and Clark, W.

Subjects
Mathematics - Dynamical Systems, Mathematics - Classical Analysis and ODEs, 34A38, 34D05, 37C30, 37C83, 70F25
Abstract

Hybrid dynamical systems are systems which undergo both continuous and discrete transitions. As typical in dynamical analysis, an essential goal is to study the long-term behavior of these systems. In this work, we present two different novel approaches for studying these systems. The first approach is based on constructing an analog of the Frobenius-Perron (transport) operator for hybrid systems. Rather than tracking the evolution of a single trajectory, this operator encodes the asymptotic nature of an ensemble of trajectories. The second approach presented applies to an important subclass of hybrid systems, mechanical impact systems. We develop an analog of Lie-Poisson(-Suslov) reduction for left-invariant impact systems on Lie groups. In addition to the Hamiltonian (and constraints) being left-invariant, the impact surface must also be a right coset of a normal subgroup. This procedure allows a reduction from a $2n$-dimensional system to an $(n+1)$-dimensional one. We conclude the paper by presenting numerical results on a diverse array of applications., Comment: 46 pages

Published
2023

19. Multiaxial fields improve SABRE efficiency by preserving hydride order

Author

Eriksson, Shannon L, Mammen, Mathew W, Eriksson, Clark W, Lindale, Jacob R, and Warren, Warren S

Subjects
Physics - Chemical Physics
Abstract

Signal Amplification By Reversible Exchange (SABRE) and the heteronuclear variant, X-SABRE, increase the sensitivity of magnetic resonance techniques using order derived from reversible binding of para-hydrogen. One current limitations of SABRE is suboptimal polarization transfer over the lifetime of the complex. Here, we demonstrate a multiaxial low-field pulse sequence which allows optimal polarization build-up during a low-field evolution pulse, followed by a high-field mixing pulse which permits proton decoupling along an orthogonal axis. This preserves the singlet character of the parahydrides while allowing exchange to replenish the ligands on the iridium catalyst. This strategy leads to a 2.5-fold improvement over continuous field SABRE SHEATH experimentally which was confirmed with numerical simulation., Comment: 9 pages (8 main document, 1 SI). 6 figures (5 main document, 1 SI)

Published
2022
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21. The Paradoxical Effect of Democratisation on the South Korean Education System in the 1980s and Early 1990s

Author

Sorensen, Clark W.

Abstract

Educational grievances made educational democratisation an important issue in the 1980s and 1990s during South Korea's democratic consolidation. Educational democratisers sought to address these through greater freedom and autonomy for teachers, students and parents combined with teacher unionisation. Some of the excesses of the highly centralised, economically utilitarian educational system of the authoritarian period were mitigated in the 1990s, but reformers had to make a coalition with neoliberal bureaucrats to consolidate democracy. As a consequence, educational reforms focused on deregulation and student choice facilitated by diversified autonomous educational institutions, including private schools at all levels. This had the paradoxical effect of meeting some goals of the democratisers for choice and autonomy while eliminating the equalisation of schools that many of the democratisers also favoured.

Published
2023
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22. Evaluating Independent Living Skills: A Quantitative Case Study of Adults with Intellectual Disabilities

Author

Clark, W. Allen

Abstract

People with mild to moderate intellectual disabilities require extra supports to have fulfilling life experiences. The problem in practice experienced by the postsecondary school was the nature and extent of supports required for individuals with intellectual disabilities to fully participate in daily life activities. The purpose of this study was to assess the effectiveness of a postsecondary program on developing life skills for students with intellectual disabilities. There was one formal instrument utilized. The "Supports Intensity Scale - Adult Version" is a standardized assessment tool designed to measure the pattern and intensity of supports that a person aged 16 years and older with intellectual disability requires to be successful in community settings. This single subject research study measured the statistically significant difference between pretest and posttest measures utilizing a paired t test. The study specifically examined the effects of curriculum intervention on levels of support with select social activities. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]

Published
2023

26. The Integer Sequence Transform $a \mapsto b$ where $b_n$ is the Number of Real Roots of the Polynomial $a_0 + a_1x + a_2x^2 + \cdots + a_nx^n$

Author

Clark, W. Edwin and Shattuck, Mark

Subjects
Mathematics - Combinatorics, 140B99 (Primary) 12D10 (Secondary)
Abstract

We discuss the integer sequence transform $a \mapsto b$ where $b_n$ is the number of real roots of the polynomial $a_0 + a_1x + a_2x^2 + \cdots + a_nx^n$. It is shown that several sequences $a$ give the trivial sequence $b = (0,1,0,1, 0,1,\ldots)$, i.e., ${b_n = n \bmod 2}$, among them the Catalan numbers, central binomial coefficients, $n!$ and $\binom{n+k}{n}$ for a fixed $k$. We also look at some sequences $a$ for which $b$ is more interesting such as $a_n = (n+1)^k$ for $k \geq 3$. Further, general procedures are given for constructing real sequences $a_n$ for which $b_n$ is either always maximal or minimal.

Published
2021

29. Intravitreal aflibercept 8 mg in neovascular age-related macular degeneration (PULSAR): 48-week results from a randomised, double-masked, non-inferiority, phase 3 trial

Author

Lanzetta, Paolo, Korobelnik, Jean-François, Heier, Jeffrey S, Leal, Sergio, Holz, Frank G, Clark, W Lloyd, Eichenbaum, David, Iida, Tomohiro, Xiaodong, Sun, Berliner, Alyson J, Schulze, Andrea, Schmelter, Thomas, Schmidt-Ott, Ursula, Zhang, Xin, Vitti, Robert, Chu, Karen W, Reed, Kimberly, Rao, Rohini, Bhore, Rafia, Cheng, Yenchieh, Sun, Wei, Hirshberg, Boaz, Yancopoulos, George D, and Wong, Tien Y

Published
2024
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30. Intravitreal aflibercept 8 mg in diabetic macular oedema (PHOTON): 48-week results from a randomised, double-masked, non-inferiority, phase 2/3 trial

Author

Abraham, Prema, Aderman, Christopher, Akiyama, Kunihiko, Alfaro, Daniel V., Ali, Fareed A., Amini, Payam, Anzalotta, Andres Emanuelli, Bátor, György, Batlle, Ivan, Berger, Adam, Bhandari, Ramanath, Bridges, William, Brinkmann, Christian, Brown, Jamin, Burgess, Stuart, Calzada, Jorge, Capone Jr., Antonio, Cervena, Dana, Charles, Steven, Chaudhry, Nauman, Chow, David, Clark, W. Lloyd, Conrad III, Paul, Cunningham, Matthew, Dadgostar, Hajir, Dessouki, Amr, Deupree, Dana, Devine, Christopher, Eichenbaum, David, Ernest, Jan, Feltgen, Nicolas, Fenberg, Moss, Ferrone, Philip, Frenkel, Ronald, Friedman, Scott, Gasperini, Julie, Gerstenblith, Adam, Ghorayeb, Ghassan, Giunta, Michel, Goff, Mitchell, Golas, Liliya, Googe Jr., Joseph M., Goren Fein, Jordana, Hagedorn, Curtis, Hagiwara, Akira, Hahn, Paul, Hairston, Richard, Handza, Jason, Hau, Vivienne, Hayashi, Ken, Heier, Jeffrey, Hershberger, Vrinda, Higgins, Patrick, Hirano, Yoshio, Honda, Shigeru, Ikegami, Yasuko, Ishida, Yuichiro, Ishikawa, Isao, Ishii, Kiyoshi, Jablon, Eric P., Jain, Atul, Kaji, Yuichi, Kapoor, Kapil, Kerényi, Ágnes, Kimura, Kazuhiro, Kishino, Genichiro, Kiss, Katalin, Kitaoka, Takashi, Klancnik, James M., Kobayashi, Namie, Kogo, Jiro, Korda, Vladimir, Kruger, Erik, Kusuhara, Sentaro, Lara, Wilfredo, Laud, Ketan, Lee, Seong, Luu, James, Marcus, Dennis, Mein, Calvin, Meleth, Annal, Milibák, Tibor, Mitamura, Yoshinori, Murata, Toshinori, Noge, Sumiyo, Onoe, Hajime, Osher, James, Papp, András, Parschauer, Justin, Patel, Sugat, Patel, Sunil, Pezda, Matthew, Pirouz, Ashkan, Prasad, Pradeep, Punjabi, Omar, Rao, Llewelyn, Roe, Richard, Schadlu, Ramin, Schneider, Eric, Shah, Ankur, Shah, Milan, Shah, Sandeep, Shah, Sumit, Sharma, Ashish, Sheth, Veeral, Shimura, Masahiko, Singerman, Lawrence, Spital, Georg, Stoltz, Robert, Suan, Eric, Suzuma, Kiyoshi, Takahashi, Hidenori, Takamura, Yoshihiro, Takeuchi, Masaru, Tan, Jeffrey, Thomas, Benjamin, Tóth,-Molnár, Edit, Ueda, Tetsuo, Ushida, Hiroaki, Vajas, Attila, Varma, Deepali, Varsányi, Balázs, Veith, Miroslav, Weber, Pamela, Wee, Raymond, Williams, Geoff, Yamada, Haruhiko, Yonekawa, Yoshihiro, Yoshida, Shigeo, Brown, David M, Boyer, David S, Do, Diana V, Wykoff, Charles C, Sakamoto, Taiji, Win, Peter, Joshi, Sunir, Salehi-Had, Hani, Seres, András, Berliner, Alyson J, Leal, Sergio, Vitti, Robert, Chu, Karen W, Reed, Kimberly, Rao, Rohini, Cheng, Yenchieh, Sun, Wei, Voronca, Delia, Bhore, Rafia, Schmidt-Ott, Ursula, Schmelter, Thomas, Schulze, Andrea, Zhang, Xin, Hirshberg, Boaz, Yancopoulos, George D, and Sivaprasad, Sobha

Published
2024
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47. Endovascular thrombectomy plus medical care versus medical care alone for large ischaemic stroke: 1-year outcomes of the SELECT2 trial

Author

Sarraj, Amrou, Abraham, Michael G, Hassan, Ameer E, Blackburn, Spiros, Kasner, Scott E, Ortega-Gutierrez, Santiago, Hussain, Muhammad Shazam, Chen, Michael, Johns, Hannah, Churilov, Leonid, Pujara, Deep K, Shaker, Faris, Maali, Laith, Cardona Portela, Pere, Herial, Nabeel A, Gibson, Daniel, Kozak, Osman, Arenillas, Juan F, Yan, Bernard, Pérez de la Ossa, Natalia, Sundararajan, Sophia, Hu, Yin C, Cordato, Dennis J, Manning, Nathan W, Hanel, Ricardo A, Aghaebrahim, Amin N, Budzik, Ronald F, Hicks, William J, Blasco, Jordi, Wu, Teddy Y, Tsai, Jenny P, Schaafsma, Joanna D, Gandhi, Chirag D, Al-Mufti, Fawaz, Sangha, Navdeep, Warach, Steven, Kleinig, Timothy J, Yogendrakumar, Vignan, Ng, Felix, Samaniego, Edgar A, Abdulrazzak, Mohammad A, Parsons, Mark W, Rahbar, Mohammad H, Nguyen, Thanh N, Fifi, Johanna T, Mendes Pereira, Vitor, Lansberg, Maarten G, Albers, Greg W, Furlan, Anthony J, Jabbour, Pascal, Sitton, Clark W, Sila, Cathy, Bambakidis, Nicholas, Davis, Stephen M, Wechsler, Lawrence, Hill, Michael D, Grotta, James C, Ribo, Marc, and Campbell, Bruce C V

Published
2024
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50. Resources: A Safe Language Abstraction for Money

Author

Blackshear, Sam, Dill, David L., Qadeer, Shaz, Barrett, Clark W., Mitchell, John C., Padon, Oded, and Zohar, Yoni

Subjects
Computer Science - Programming Languages
Abstract

Smart contracts are programs that implement potentially sophisticated transactions on modern blockchain platforms. In the rapidly evolving blockchain environment, smart contract programming languages must allow users to write expressive programs that manage and transfer assets, yet provide strong protection against sophisticated attacks. Addressing this need, we present flexible and reliable abstractions for programming with digital currency in the Move language [Blackshear et al. 2019]. Move uses novel linear [Girard 1987] resource types with semantics drawing on C++11 [Stroustrup 2013] and Rust [Matsakis and Klock 2014]: when a resource value is assigned to a new memory location, the location previously holding it must be invalidated. In addition, a resource type can only be created or destroyed by procedures inside its declaring module. We present an executable bytecode language with resources and prove that it enjoys resource safety, a conservation property for program values that is analogous to conservation of mass in the physical world.

Published
2020

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