Search

Your search keyword '"Yang, Chan"' showing total 2,506 results
Start Over Author "Yang, Chan"

Refine your results

more »

more »

more »

more »

more »

more »
2,506 results on '"Yang, Chan"'

1. Multi-qubit Lattice Surgery Scheduling

Author

Silva, Allyson, Zhang, Xiangyi, Webb, Zak, Kramer, Mia, Yang, Chan Woo, Liu, Xiao, Lemieux, Jessica, Chen, Ka-Wai, Scherer, Artur, and Ronagh, Pooya

Subjects
Quantum Physics, Computer Science - Hardware Architecture, Mathematics - Optimization and Control
Abstract

Fault-tolerant quantum computation using two-dimensional topological quantum error correcting codes can benefit from multi-qubit long-range operations. By using simple commutation rules, a quantum circuit can be transpiled into a sequence of solely non-Clifford multi-qubit gates. Prior work on fault-tolerant compilation avoids optimal scheduling of such gates since they reduce the parallelizability of the circuit. We observe that the reduced parallelization potential is outweighed by the significant reduction in the number of gates. We therefore devise a method for scheduling multi-qubit lattice surgery using an earliest-available-first policy, solving the associated forest packing problem using a representation of the multi-qubit gates as Steiner trees. Our extensive testing on random and application-inspired circuits demonstrates the method's scalability and performance. We show that the transpilation significantly reduces the circuit length on the set of circuits tested, and that the resulting circuit of multi-qubit gates has a further reduction in the expected circuit execution time compared to serial execution., Comment: 23 pages, 7 figures, 4 tables

Published
2024
Full Text
View/download PDF

8. Short-term outcomes of Transrectal Natural Orifice Specimen extraction compared with conventional minimally invasive surgery for selected patients with colorectal cancer: a propensity score matching analysis and literature review

Author

Li-Yang Chan, Yih-Jong Chern, Yu-Jen Hsu, Bor-Kang Jong, I-Li Lai, Pao-Shiu Hsieh, Chun-Kai Liao, and Jeng-Fu You

Subjects
Surgery, RD1-811, Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282
Abstract

Abstract Purpose Conventional minimally invasive surgery requires mini-laparotomy to extract the pathological specimen. However, by using a natural orifice as the delivery route, natural orifice specimen extraction (NOSE) surgery avoids the need for a large incision. This study analyzed the short-term outcome of NOSE compared with conventional mini-laparotomy (CL) for colorectal cancer surgery. Methods We conducted a retrospective analysis of 1,189 patients who underwent surgery for primary colorectal cancer between the cecum and upper rectum. Propensity score analyses were applied to the NOSE and CL groups in a 1:1 matched cohort. Results After propensity score matching, each group included 201 patients. The NOSE group and CL group did not differ significantly in terms of baseline characteristics. Postoperative morbidity and mortality rates were comparable. Compared with the CL group, the NOSE group experienced a shorter time to first flatus (1.6 ± 0.8 vs. 2.0 ± 1.2 days, p

Published
2024
Full Text
View/download PDF

16. Reversibly controlled ternary polar states and ferroelectric bias promoted by boosting square-tensile-strain

Author

Lee, Jun Han, Duong, Nguyen Xuan, Jung, Min-Hyoung, Lee, Hyun-Jae, Kim, Ahyoung, Yeo, Youngki, Kim, Junhyung, Kim, Gye-Hyeon, Cho, Byeong-Gwan, Kim, Jaegyu, Naqvi, Furqan Ul Hassan, Bae, Jong-Seong, Kim, Jeehoon, Ahn, Chang Won, Kim, Young-Min, Song, Tae Kwon, Ko, Jae-Hyeon, Koo, Tae-Yeong, Sohn, Changhee, Park, Kibog, Yang, Chan-Ho, Yang, Sang Mo, Lee, Jun Hee, Jeong, Hu Young, Kim, Tae Heon, and Oh, Yoon Seok

Subjects
Condensed Matter - Materials Science
Abstract

Interaction between dipoles often emerges intriguing physical phenomena, such as exchange bias in the magnetic heterostructures and magnetoelectric effect in multiferroics, which lead to advances in multifunctional heterostructures. However, the defect-dipole tends to be considered the undesired to deteriorate the electronic functionality. Here, we report deterministic switching between the ferroelectric and the pinched states by exploiting a new substrate of cubic perovskite, BaZrO$_{3}$, which boosts square-tensile-strain to BaTiO$_{3}$ and promotes four-variants in-plane spontaneous polarization with oxygen vacancy creation. First-principles calculations propose a complex of an oxygen vacancy and two Ti$^{3+}$ ions coins a charge-neutral defect-dipole. Cooperative control of the defect-dipole and the spontaneous polarization reveals ternary in-plane polar states characterized by biased/pinched hysteresis loops. Furthermore, we experimentally demonstrate that three electrically controlled polar-ordering states lead to switchable and non-volatile dielectric states for application of non-destructive electro-dielectric memory. This discovery opens a new route to develop functional materials via manipulating defect-dipoles and offers a novel platform to advance heteroepitaxy beyond the prevalent perovskite substrates., Comment: According to the Copyright Policy, the submission version (before peer-review and revision)

Published
2022
Full Text
View/download PDF

17. H\'ormander type theorem for multilinear Pseudo-differential operators

Author

Heo, Yaryong, Hong, Sunggeum, and Yang, Chan Woo

Subjects
Mathematics - Analysis of PDEs, Mathematics - Classical Analysis and ODEs, 42B20 (Primary) 42B15 (Secondary)
Abstract

We establish a H\"{o}rmander type theorem for the multilinear pseudo-differential operators, which is also a generalization of the results in \cite{MR4322619} to symbols depending on the spatial variable. Most known results for multilinear pseudo-differential operators were obtained by assuming their symbols satisfy pointwise derivative estimates(Mihlin-type condition), that is, their symbols belong to some symbol classes $n$-$\mathcal{S}^m_{\rho, \delta}(\mathbb{R}^d)$, $0 \le \delta \le \rho \le1$, $0 \le \delta<1$ for some $m \le 0$. In this paper, we shall consider multilinear pseudo-differential operators whose symbols have limited smoothness described in terms of function space and not in a pointwise form(H\"ormander type condition). Our conditions for symbols are weaker than the Mihlin-type conditions in two senses: the one is that we only assume the first-order derivative conditions in the spatial variable and lower-order derivative conditions in the frequency variable, and the other is that we make use of $L^2$-average condition rather than pointwise derivative conditions for the symbols. As an application, we obtain some mapping properties for the multilinear pseudo-differential operators associated with symbols belonging to the classes $n$-$\mathcal{S}^{m}_{\rho,\delta}(\mathbb{R}^{d})$, $0 \le \rho \le 1$, $0 \le \delta<1$, $m \le 0$. Moreover, it can be pointed out that our results can be applied to wider classes of symbols which do not belong to the traditional symbol classes $n$-$\mathcal{S}^{m}_{\rho,\delta}(\mathbb{R}^{d})$.

Published
2022

26. Validation of the European system for cardiac operative risk evaluation II in a large Taiwan cardiac surgical centre

Author

Shih-Yu Fang, Jeng-Wei Chen, Heng-Wen Chou, Chih-Yang Chan, I-Hui Wu, Nai-Kuan Chou, Chih-Hsien Wang, Nai-Hsin Chi, Shu-Chien Huang, Hsi-Yu Yu, Yih-Sharng Chen, and Ron-Bin Hsu

Subjects
EuroSCORE II, Validation, Risk assessment, Cardiac surgery, Medicine (General), R5-920
Abstract

Background: The European System for Cardiac Operative Risk Evaluation (EuroSCORE II) is a well-established scoring system for predicting mortality in cardiac surgery. This system was derived predominantly from a European patient cohort; however, no validation of this system has been conducted in Taiwan. We sought to assess the performance of EuroSCORE II at a tertiary centre. Methods: The 2161 adult patients receiving cardiac surgery between 2017 and 2020 in our institution were included. Results: Overall, the in-hospital mortality rate was 7.89%. The performance of EuroSCORE II was assessed using the area under the receiver operator curve (AUC) for discrimination and the Hosmer–Lemeshow (H–L) test for calibration. Data were analysed for type of surgery, risk stratification, and status of the operation.EuroSCORE II had good discriminative power (AUC=0.854, 95% Confidence Interval (CI): 0.822–0.885) and good calibration (χ2=5.19, p=0.82) for all types of surgery except ventricular assist devices (AUC=0.618, 95% CI: 0.497–0.738). EuroSCORE II also showed good calibration for most types of surgery except coronary artery bypass surgery (CABG) combined procedure (P=0.033), heart transplantation (HT) (P=0.017), and urgent operation (P=0.041). EuroSCORE II significantly underestimated the risk for CABG combined procedure and urgent operations, and overestimated the risk for HT. Conclusion: EuroSCORE II had satisfactory discrimination and calibration power to predict surgical mortality in Taiwan. However, the model is poorly calibrated for CABG combined procedure, HT, urgent operation, and, likely, lower- and higher-risk patients.

Published
2023
Full Text
View/download PDF

27. Results of streamlining TAVR procedure towards a minimalist approach: a single center experience in Taiwan

Author

Tsung-Yu Ko, Hsien-Li Kao, Yi-Chang Chen, Chih-Fan Yeh, Ching-Chang Huang, Ying-Hsien Chen, Chih-Yang Chan, Lung-Chun Lin, Ming-Jiuh Wang, Yih-Sharng Chen, and Mao-Shin Lin

Subjects
Medicine, Science
Abstract

Abstract Trans-femoral transcatheter aortic valve replacement (TF-TAVR) performed under conscious sedation (LACS) is not yet become routine practice in Taiwan. We aimed to compared the results between patients received general anesthesia (GA) versus LACS. Our cohort was divided into 3 groups: initial 48 patients received TF-TAVR under routine GA (GA group), subsequent 50 patients under routine LACS (LACS group 1), and recent 125 patients under LACS (LACS group 2). The baseline, procedural characteristics and all outcomes were prospectively collected and retrospectively compared. From Sep 2010 to July 2019, a total of 223 patients were included. The procedure time (157.6 ± 39.4 min vs 131.6 ± 30.3 vs 95.2 ± 40.0,

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results