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Moderate Deviations for Marked Hawkes Processes

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Acta Mathematica Sinica,English Series 2017年第10期33卷 1297-1304页

作者： Youngsoo seol Department of Mathematics and Statistics University of South Florida Tampa FL 33620 USA

We consider a linear Hawkes process with random marks. Some limit theorems have been studied by Karabash and Zhu [Stoch. Models, 31,433-451 （2015）]. In this paper, we obtain a moderate deviation principle for marked... 详细信息

关键词： Marked Hawkes processes self-exciting processes moderate deviation principles largedeviations Hawkes processes

Limit Theorems for Inverse Process Tn of Hawkes Process

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Acta Mathematica Sinica,English Series 2017年第1期33卷 51-60页

作者： Youngsoo seol Department of Mathematics and Statistics University of South Florida Tampa FL 33620 USA

We consider linear Hawkes process Nt and its inverse process Tn. The limit theorems for Nt are well known and studied by many authors. In this paper, we study the limit theorems for Tn. In particular, we investigate the law of large numbers, the central limit theorem and the large deviation principle for Tn. The main tool of the proof is based on immigration-birth representation and the observations on the relation between N＋ and Tn

关键词： Hawkes processes self-exciting processes central limit theorems law of large numbers,large deviations

Biomimetic Quadruped Robot with a Spinal Joint and Optimal Spinal Motion via Reinforcement Learning

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Journal of Bionic Engineering 2021年第6期18卷 1280-1290页

作者： Young Kook Kim Woojin seol Jihyuk Park LV R&D Team Electro-technology R&D CenterLS Electric Co.LtdCheongju28437Republic of Korea Digital Innovation Unit Korea Hydro&Nuclear Power Co.Ltd1312-gil YuseongdaeroYusung-guDaejeon34101Republic of Korea Department of Automotive Engineering College of Mechanical and IT EngineeringYeungnam University280 Daehak-roGyeongsanGyeongbuk38541Republic of Korea

Feline animals can run quickly using spinal joints as well as the joints that make up their four *** paper describes the development of a quadruped robot including a spinal joint that biomimics feline *** developed robot platform consists of four legs with a double 4-bar linkage type and one simplified rotary *** addition,Q-learning,a type of machine learning,was used to find the optimal motion profile of the spinal *** bounding gait was implemented on the robot system using the motion profile of the spinal joint,and it was confirmed that using the spinal joint can achieve a faster Center of Mass(CoM)forward speed than not using the spinal *** the motion profile obtained through Q-learning did not exactly match the spinal angle of a feline animal,which is more multiarticular than that of the developed robot,the tendency of the actual feline animal spinal motion profile,which is sinusoidal,was similar.

关键词： Quadruped robot system Bioinspired methods Legged robots Machine learning Q-learning

Numerical Study on Statistical Behaviors of Two-Dimensional Dry Foam

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Communications in Computational Physics 2019年第1期25卷 289-310页

作者： Yunchang seol Yongsam Kim Department of Applied Mathematics National Chiao Tung University1001 Ta Hsueh RoadHsinchu 300Taiwan Department of Mathematics Chung-Ang UniversityDongjakgu HeukseokdongSeoul 156-756Korea

We investigate the statistical behaviors of two-dimensional dry foam using numerical simulations based on the immersed boundary(IB)*** model the liquid phase of a foam as a thin elastic boundary with surface tension and the gas phase as a viscous incompressible fluid which can go through the liquid *** present evidence of the existence of a limiting scaling state of the dry foam dynamics in which the asymptotic value ofμ_(2),the second moment of the distribution of the numbers of cell sides,lies in the range of 1.3±*** also numerically ver-ify some well-known formulas derived in the dynamics of two-dimensional dry foam such as von Neumann relation,Lewis law,and Aboav-Weaire *** simulation re-sults are comparable to those of soap froth experiments and Potts model ***,we investigate the statistical behaviors of two-dimensional dry foam in an oscillatory shear flow to show the applicability of our method to more general flow conditions.

关键词： Foam dynamics immersed boundary method scaling state von Neumann relation Lewis law Aboav-Weaire law

Modified embedded-atom method interatomic potentials for Mg-Al-Ca and Mg-Al-Zn ternary systems

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Journal of Magnesium and Alloys 2021年第1期9卷 317-335页

作者： Hyo-Sun Jang Donghyuk seol Byeong-Joo Lee Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea

Al,Ca,and Zn are representative commercial alloying elements for Mg *** investigate the effects of these elements on the deformation and recrystallization behaviors of Mg alloys,we develop interatomic potentials for the Al-Ca,Al-Zn,Mg-Al-Ca and Mg-Al-Zn systems based on the second nearest-neighbor modified embedded-atom method *** developed potentials describe structural,elastic,and thermodynamic properties of compounds and solutions of associated alloy systems in reasonable agreement with experimental data and higher-level *** applicability of these potentials to the present investigation is confirmed by calculating the generalized stacking fault energy for various slip systems and the segregation energy on twin boundaries of the Mg-Al-Ca and Mg-Al-Zn alloys,accompanied with the thermal expansion coefficient and crystal structure maintenance of stable compounds in those alloys.

关键词： 2NN MEAM Interatomic potential Mg-Al-Ca Mg-Al-Zn Atomistic simulation

The burden of prostatic calculi is more important than the presence

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Asian Journal of Andrology 2017年第4期19卷 482-485页

作者： Bumsoo Park seol Ho Choo Department of Urology Kangnam General Hospital Yongin Korea Department of Family Medicine Henry Ford Hospital Wayne State University School of Medicine Detroit MI United States Department of Urology Ajou University School of Medicine Suwon Korea

Prostatic calculi are a common finding on transrectal prostate ultrasound. However, it remains unclear whether they are significantly associated with lower urinary tract symptoms （LUTS）. Our objective was to evaluate the association between prostatic calculi and LUTS with a focus on ＂calculi burden＂ because no studies have investigated prostatic calculi using ＂calculi burden＂ as an indicator. A total of 606 participants who received transrectal prostate ultrasound were divided into two groups according to the presence of prostatic calculi. ＂Calculi burden＂ was defined as the sum of the transverse diameters of all visible calculi within the prostate. The International Prostatic Symptom Score （IPSS） and a quality of life （QoL） score were collected. Both groups were compared, and a multivariate analysis was performed to predict moderate/severe LUTS. Linear correlation was evaluated between calculi burden and IPSS in the calculi group. No differences in total IPSS, voiding IPSS, or QoL score were detected between the two groups, but storage IPSS was significantly higher in the calculi group than that of controls. The multivariate analysis showed that the presence of prostatic calculi was not an independent predictor of moderate/severe LUTS. A positive linear correlation was detected between calculi burden and storage IPSS in calculi group （r = O. 148）. However, no correlation was found between calculi burden and total IPSS, voiding IPSS, or QoL score. Our results showed that the presence of prostatic calculi was not a significant factor predicting moderate/severe LUTS. However, an increased calculi burden may be associated with aggravating storage symptoms.

关键词： calculi lower urinary tract symptoms prostate prostatitis

Helicobacter pylori infection in gastric mucosa-associated lymphoid tissue lymphoma

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World Journal of Gastroenterology 2014年第11期20卷 2751-2759页

作者： Jeong Bae Park Ja seol KooJeong Department of Internal Medicine College of MedicineDongguk UniversityGyeongju 780-350South Korea Division of Gastroenterology and Hepatology Department of Internal MedicineKorea University Ansan HospitalAnsan 425-707South Korea

Gastrointestinal lymphoma is the most common type of extranodal lymphoma,and most commonly affects the *** zone B-cell lymphoma of the mucosa-associated lymphoid tissue(MALT)and diffuse large B-cell lymphoma are the most common histologic types of gastric *** its increasing incidence,diagnosis of gastric lymphoma is difficult at an earlier stage due to its nonspecific symptoms and endoscopic findings,and,thus,a high index of suspicion,and multiple,deep,repeated biopsies at abnormally and normally appearing sites in the stomach are *** addition,testing for Helicobacter pylori(***)infection and endoscopic ultrasonography to determine the depth of tumor invasion and involvement of regional lymph nodes is essential for predicting response to *** eradication and for assessment of disease *** addition,*** infection and MALT lymphoma development are associated,and complete regression of low-grade MALT lymphomas after *** eradication has been *** and/or chemotherapy can be used in cases that show poor response to *** eradication,negativity for *** infection,or high-grade lymphoma.

关键词： Mucosa-associated lymphoid tissue Lymphoma Helicobacter pylori Eradication Remission

Optimal and interactive keyframe selection for motion capture

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Computational Visual Media 2019年第2期5卷 171-191页

作者： Richard Roberts J.P.Lewis Ken Anjyo Jaewoo Seo Yeongho seol Victoria University of Wellington WellingtonNew Zealand SEED Electronic ArtsLos AngelesUnited States OLM Digital TokyoJapan Pinscreen Los AngelesUnited States Weta Digital WellingtonNew Zealand

Motion capture is increasingly used in games and movies, but often requires editing before it can be used, for many reasons. The motion may need to be adjusted to correctly interact with virtual objects or to fix problems that result from mapping the motion to a character of a different size or, beyond such technical requirements, directors can request stylistic ***, editing is laborious because of the lowlevel representation of the data. While existing motion editing methods accomplish modest changes, larger edits can require the artist to "re-animate" the motion by manually selecting a subset of the frames as *** this paper, we automatically find sets of frames to serve as keyframes for editing the motion. We formulate the problem of selecting an optimal set of keyframes as a shortest-path problem, and solve it efficiently using dynamic programming. We create a new simplified animation by interpolating the found keyframes using a naive curve fitting technique. Our algorithm can simplify motion capture to around 10% of the original number of frames while retaining most of its detail. By simplifying animation with our algorithm, we realize a new approach to motion editing and stylization founded on the timetested keyframe interface. We present results that show our algorithm outperforms both research algorithms and a leading commercial tool.

关键词： motion capture motion editing keyframe animation dynamic programming

Microstructure and Mechanical Properties of Mg-Al-Ca-Nd Alloys Fabricated by Gravity Casting

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Journal of Materials Science & Technology 2008年第1期24卷 85-88页

作者： Hyeon-Taek Son Jae-seol Lee Ik-Hyun Oh Chang-Seog Kang Korea Institute of Industrial Technology 1110-90ryong-dong Buk-gu Gwangju 500-480 South Korea

The aims of this study are to investigate the effects of Nd addition in the Mg-Al-Ca alloys on microstructure and mechanical *** of as-cast Mg-5Al-3Ca alloy containing Nd consists ofα-Mg matrix, eutectic phase and Al-Nd rich intermetallic *** Nd addition was increased,α-Mg matrix morphology was changed from dendritic to equiaxed grains and average value of grain size was *** addition to Mg-5Al-3Ca based alloys resulted in the formation of Al-Nd rich intermetallic compounds at grain boundary andα-Mg matrix *** these Al-Nd rich intermetallic compounds were dispersed *** these alloys,two kinds of eutectic phases were observed,*** irregular-shape structure at grain boundary and fine needle-shape structure in theα-Mg matrix *** is found that the ultimate strength showed the maximum value of 271 MPa at Mg-5Al-3Ca-2Nd alloy and elongation was decreased as the addition of Nd was increased.

关键词： Mg-AI-Ca alloy Neodymium (Nd) Rare earth element