165 events in 2023

Workshop
The 19th High Performance Computing Physics (HPCPhys) Workshop
August 31 (Thu) at 13:30  17:30, 2023
Computational science is indispensable research method in various fields in physics. On the other hand, there is technical challenge in massive numerical simulations, such as optimization for each computational system and proper choice of computational method, and it is desirable to promote interdisciplinary collaborations between different fields. This series of workshops is organized to enhance such interdisciplinary activities among wide area of computational physics. The 19th workshop will be held with the following program: Program 13:3013:35 Introduction 13:3514:25 Tomonori Shirakawa : "Simulation of quantum computation using tensor network method" 14:2515:15 Misa Ogata : "New computational method using Lagrangian construction for equilibrium shape of 2dimensional stars" 15:1515:35 Break 15:3516:25 Rico Pohle : "Semiclassical Monte Carlo and molecular dynamics simulations of spin coherent states" 16:2517:15 KenIchi Ishikawa : "Algorithms for Lattice Quantum Chromodynamics" 17:1517:30 Discussions (17:30 Informal social gathering)
Venue: Welfare and Conference Bldg. 2F Meeting Room, RIKEN Wako Campus
Event Official Language: Japanese

Seminar
MNISQ: A LargeScale Quantum Circuit Dataset for Machine Learning on/for Quantum Computers in the NISQ era
August 29 (Tue) at 14:00  15:30, 2023
Leonardo Placidi (Ph.D. Student, Graduate School of Engineering Science, Osaka University)
We introduce the first largescale dataset, MNISQ, for both the Quantum and the Classical Machine Learning community during the Noisy IntermediateScale Quantum era. MNISQ consists of 4,950,000 data points organized in 9 subdatasets. Building our dataset from the quantum encoding of classical information (e.g., MNIST dataset), we deliver a dataset in a dual form: in quantum form, as circuits, and in classical form, as quantum circuit descriptions (quantum programming language, QASM). In fact, also Machine Learning research related to quantum computers undertakes a dual challenge: enhancing machine learning by exploiting the power of quantum computers, while also leveraging stateoftheart classical machine learning methodologies to help the advancement of quantum computing. Therefore, we perform circuit classification on our dataset, tackling the task with both quantum and classical models. In the quantum endeavor, we test our circuit dataset with Quantum Kernel methods, and we show excellent results with up to 97% accuracy. In the classical world, the underlying quantum mechanical structures within the quantum circuit data are not trivial. Nevertheless, we test our dataset on three classical models: Structured State Space sequence model (S4), Transformer, and LSTM. In particular, the S4 model applied on the tokenized QASM sequences reaches an impressive 77% accuracy. These findings illustrate that quantum circuitrelated datasets are likely to be quantum advantageous, but also that stateoftheart machine learning methodologies can competently classify and recognize quantum circuits. We finally entrust the quantum and classical machine learning community.
Venue: #345, 3F, Main Research Building, RIKEN Wako Campus (Main Venue) / via Zoom
Event Official Language: English

Seminar
Landscape structure drives ecoevolution in host parasite systems
August 24 (Thu) at 16:00  17:00, 2023
Jhelam Deshpande (Ph.D. Student, Biodiversity: dynamics, interactions and conservation team, Institute of Evolutionary Science of Montpellier, France)
As all biological and many artificial systems, hosts and their parasites are most often spatially structured. Besides this highly relevant spatial context, parasites may change through time due to to evolutionary processes, including mutation and selection. These facts imply that we must study hostparasite systems taking into account space and evolution. Past work has mainly focused on simple spatial structures, but how parasites evolve in realistically complex landscapes remains unclear, hampering the translation of theoretical predictions to real ecological systems.Therefore, we here develop an ecoevolutionary metapopulation model of hostparasite interactions in which hosts and parasites disperse through realistically complex spatial graphs. Parasite virulence, a parasite lifehistory trait of central importance that here impacts host reproduction, is able to evolve. Our model therefore captures the ecoevolutionary feedback loop between host demography and parasite evolution in space. In order to gain a general understanding of parasite ecoevolution in space, we analyse our model for spatial networks that represent terrestrial (represented by randomgeometric graphs; RGG) and riverine aquatic (represented by optimal channel networks; OCN) landscapes. We find that evolved virulence is generally a function of host dispersal, with a unimodal relationship in aquatic and a saturating relationship in terrestrial landscape, and this is driven by higher order network properies. Consistent with previous work, we show that our results are driven by kin selection, because dispersal and landscape structure impact both patterns of relatedness and availability of susceptible hosts. Our model yields readily testable predictions, including that terrestrial parasites should be more virulent than aquatic parasites are low dispersal rates and vice versa as dispersal increases. These differences in evolved virulence directly lead to differences in system stability, with more virulent parasites more often leading to host extinction. Thus, in this study we highlight the role of landscape structure in driving ecoevolutionary dynamics of parasites.
Venue: via Zoom
Event Official Language: English

Workshop
Exploring 2D Quantum Spacetime Based on Causal Dynamical Triangulations
August 21 (Mon)  23 (Wed), 2023
Yuki Sato (Associate Professor, National Institute of Technology, Tokuyama College)
This is the fourth event by the Quantum Gravity Gatherings (QGG) Study Group at RIKEN iTHEMS. For this event we have invited Prof. Yuki Sato, National Institute of Technology, Tokuyama College, to give pedagogical lectures on the causal dynamical triangulations approach to quantum gravity. We wish this event to provide insights to researchers in related fields. The causal dynamical triangulations formalism appears to be one of the most promising constructive approaches to quantum gravity: possessing deep links with the asymptotic safety programme and HořavaLifshitz gravity, causal dynamical triangulations appears to avoid many of the wellknown pathologies characteristic of its Euclidean analogue. As an example the emergence of spacetime geometry remains possible in various spacetime dimensions. While many of the results in higher dimensions are understood only at the numerical level, the analytical study of the approach in two spacetime dimensions is relatively well developed; Yuki Sato is a leading expert on these latter developments and we are very lucky he has agreed to present the understanding of 2D causal spacetime coming from this approach in a manner consistent with the Quantum Gravity Gatherings philosophy. This intensive lecture series is intended to be a lively and participatory event, not just a listening experience. For this reason, the number of participants will be limited to about 30 with priority given to graduate students and young postdocs; the intensive talk will be given in a facetoface blackboard style (in English, no online streaming) to allow for informal and lively Q&A discussions. The program will also include short talk sessions, where interested participants can give a 5 min talk on a topic of their choice (their research, reviews on some works, what they want to study in the future, etc.). Registration is available via the dedicated website.
Venue: #435437, 4F, Main Research Building
Event Official Language: English

Mating system of buckwheat
August 17 (Thu) at 16:00  17:00, 2023
Jeffrey Fawcett (Senior Research Scientist, iTHEMS)
Buckwheat (soba in Japanese) has a slightly unusual mating system called heterostylous selfincompatibility where two types of individuals coexist, one that produces flowers with a long style (female part of the flower) and short stamen (male part of the flower), and the other that produces flowers with a short style and long stamen. Mating is only successful when it occurs between the different types of individuals. It is a bit similar to sexual dimorphism where males and females coexists but in this case all individuals have both male and female organs. In this talk, I will introduce the basics of this mating system in buckwheat and some work we have been doing. In particular, I will talk about its genetic architecture and some parallels observed with other plants in which a similar mating system evolved independently. The talk will be aimed at nonexperts so nonbiologists are also welcome to attend.
Venue: via Zoom
Event Official Language: English

Seminar
Dark matter heating vs vortex creep heating in old neutron stars
August 7 (Mon) at 13:30  15:00, 2023
Motoko Fujiwara (Postdoctoral Researcher, Theoretical Particle Physics Group, Technical University of Munich, Germany)
Old isolated neutron stars have been gathering attention as targets to probe Dark Matter (DM) through temperature observations. DM will anomalously heat neutron stars through its gravitational capture and annihilation process, which predicts surface temperature as T_s ~ (1 − 3) × 10^3 K for t > 10^6 years. We may put constraints on DMnucleon scattering cross section by finding even colder neutron stars. This story, however, assumed that there is no relevant heating source for old neutron stars. In this talk, we discuss the creep motion of vortex lines in the neutron superfluid of the inner crust as the heating mechanism. This creep mechanism is inherent in the structure of neutron stars. The heating luminosity is proportional to the time derivative of the angular velocity of the pulsar rotation, and the proportional constant J has an approximately universal value for each neutron star. If this vortex creep heating is quantitatively relevant against DM heating, this mechanism may cause a serious background to probe DM. The J parameter can be determined from the temperature observation of old neutron stars because the heating luminosity is balanced with the photon emission in the late time. We study the latest data of neutron star temperature observation and find that these data indeed give similar values of J, in favor of the assumption that these neutron stars are heated by the frictional motion of vortex lines. Besides, these values turn out to be consistent with the theoretical calculations of the vortexnuclear interaction. Integarting all the results, we evaluate the vortex creep heating and conclude its significance against DM heating.
Venue: Seminar Room #359 (Main Venue) / via Zoom
Event Official Language: English

Seminar
Quasilocal holography in 3d quantum gravity
August 4 (Fri) at 14:00  15:30, 2023
Etera Livine (Research Director CNRS, Ecole Normale Supérieure de Lyon, France)
Since the idea appeared in black hole physics, the concept of holography has become a guiding principle for quantum gravity. It is the notion that the dynamics of the geometry of a region of spacetime can be entirely encoded in a theory living on its boundary. Although such holographic dualities have been welldeveloped in an asymptotical context, it remains a challenge to realize it exactly at finite distances. I will draw a possible route in 3d quantum gravity, by showing a duality between the PonzanoRegge path integral for 3d quantum gravity as a topological field theory and the 2d (inhomogeneous) Ising model. This leads to an intriguing geometrical interpretation of the Ising critical couplings and opens the door to a possibly rich interplay between 3d quantum gravity and 2d condensed matter built out of holographic dualities.
Venue: Seminar Room #359 (Main Venue) / via Zoom
Event Official Language: English

Seminar
Evidence against a strong firstorder phase transition in neutron star cores: impact of new data
August 1 (Tue) at 13:30  15:00, 2023
Len Brandes (Ph.D. Student, Technical University of Munich, Germany)
Information on the phase structure of strongly interacting matter at high baryon densities can be gained from observations of neutron stars and their detailed analysis. Bayesian inference methods are used to set constraints on the speed of sound in the interior of neutron stars, based on recent multimessenger data in combination with lowdensity constraints based on chiral effective field theory and perturbative QCD constraints at asymptotically high densities. A detailed reanalysis is performed in order to clarify the influence of the latter constraints on the inference procedure. The impact of the recent new heavy (2.35 M_sol) black widow pulsar PSR J09520607 and of the unusually light supernova remnant HESS J1731347 is inspected. One of the consequences of including PSR J09520607 in the database is a further stiffening of the equationofstate, resulting in a 2.1 solarmass neutron star in a reduced central density of less than five times the equilibrium density of normal nuclear matter. A systematic Bayes factor assessment quantifies the evidence (or nonevidence) for small sound speeds, necessary for a strong firstorder phase transition, within the range of densities realized in the core of neutron stars. Given the presently existing database, it can be concluded that the occurrence of a strong firstorder phase transition in the core of even a 2.1 solarmass neutron star is unlikely, while a continuous crossover cannot be ruled out.
Venue: via Zoom (Main Venue) / Seminar Room #132
Event Official Language: English

Seminar
Clifford Group and Unitary Designs under Symmetry
July 31 (Mon) at 14:00  15:30, 2023
Yosuke Mitsuhashi (Ph.D. Student, Department of Applied Physics, Graduate School of Engineering, The University of Tokyo)
We have generalized the wellknown statement that the Clifford group is a unitary 3design into symmetric cases by extending the notion of unitary design. Concretely, we have proven that a symmetric Clifford group is a symmetric unitary 3design if and only if the symmetry constraint is described by some Pauli subgroup. We have also found a complete and unique construction method of symmetric Clifford groups with simple quantum gates for Pauli symmetries. For the overall understanding, we have also considered physically relevant U(1) and SU(2) symmetry constraints, which cannot be described by a Pauli subgroup, and have proven that the symmetric Clifford group is a symmetric unitary 1design but not a 2design under those symmetries. Our findings are numerically verified by computing the frame potentials, which measure the difference in randomness between the uniform ensemble on the symmetric group of interest and the symmetric unitary group. This work will open a new perspective into quantum information processing such as randomized benchmarking, and give a deep understanding to manybody systems such as monitored random circuits.
Venue: #345347, Main Research Building, RIKEN Wako Campus (Main Venue) / via Zoom
Event Official Language: English

Lecture
Higher Algebra in Geometry
July 31 (Mon)  August 10 (Thu), 2023
Hiro Lee Tanaka (Assistant Professor, Department of Mathematics, Texas State University, USA)
In these lectures, we will shed light on modern tools of higher algebra, where the traditional structures of algebra yield themselves only after controlled deformations. We will introduce infinitycategories, spectra, operads, and other standard tools of the last decade. The main applications will be to encode various higheralgebraic structures that inevitably arise in, and shed light on, geometry and topology. If time permits, we will illustrate how spectra naturally arise in geometric invariants. The audience is imagined to consist of mathematicians interested in applications of infinitycategorical tools  so a broad range of geometers (including topologists) and algebraists. From Lecture Two onward, I will assume basic knowledge of algebraic topology (e.g., the material of Hatcher) and homological algebra. These lectures will be held between July 31 and August 10, each from 10:30 to 12:00, for a total of 8 lectures. 1st Week: Jul 31(mon), Aug 1(tue)  3(thu)  Introduction to ideas of higher algebra in geometry, for a general audience.  Introduction to infinitycategories and to spectra. 2nd Week: Aug 7(mon)  10(thu)  Examples in geometry and topology, including invariants of Legendrian links and generating functions.  Future Directions. Profile: Hiro Lee Tanaka is an assistant professor in the Department of Mathematics. After receiving his Ph.D. from Northwestern University and completing postdoctoral work at Harvard University, he conducted research at the Mathematical Sciences Research Institute in Berkeley, California, and at the Isaac Newton Institute in Cambridge, England. His research aims to fuse the higher structures in modern algebra with geometries emerging from both classical mechanics and supersymmetric field theories. Beyond research, Tanaka engages in efforts to create more equitable and supportive environments throughout the mathematics community.
Venue: #435437, Main Research Building / via Zoom
Event Official Language: English

Lecture
3rd QGG Intensive Lectures: Spinfoam path integrals for Quantum Gravity
July 26 (Wed)  28 (Fri), 2023
Etera Livine (Research Director CNRS, Ecole Normale Supérieure de Lyon, France)
At the crossroads of several approaches to quantum gravity, Spinfoams propose a discrete path integral for quantum general relativity built from topological field theory. With the spectrum of geometric operators directly read from the representation theory of the local symmetry group, they can be interpreted as a quantized version of Regge calculus and can be understood as implementing the dynamics of quantum states geometry in loop quantum gravity. I will explain the basics of the formalism, the motivations, the mathematical framework and the main tools. In three spacetime dimensions, the spinfoam quantization of 3d gravity is given by the TuraevViro topological invariant, which is intimately related to the quantization of ChernSimons theory. I will explain in particular how the spinfoam amplitudes solve the Wheelerde Witt equation, implement the invariance under 3d diffeomorphisms (despite being formulated in a discretized spacetime) and lead to a quasilocal version of holography. In four spacetime dimensions, general relativity can be formulated as an almosttopological theory and I will explain how the existing spinfoam models introduce a sea of topological defects to recreate the gravitational degrees of freedom from a topological path integral. Finally, I will show how spinfoams are naturally defined in terms of group field theory, which are generalized tensor models, and the prospects that this opens. I will conclude with the main challenges and open lines of research of the field. Program: July 26 10:00  10:15 Registration and reception 10:15  11:45 Lecture 1 11:45  13:30 Lunch & coffee break 13:30  15:00 Lecture 2 15:00  16:00 Coffee break 16:00  17:00 Lecture 3 17:10  18:30 Short talk session July 27 10:00  11:45 Lecture 4 11:45  13:30 Lunch & coffee break 13:30  15:00 Lecture 5 15:00  16:00 Coffee break 16:00  17:00 Lecture 6 17:30  20:00 Banquet July 28 10:00  11:45 Lecture 7 11:45  13:30 Lunch & coffee break 13:30  15:00 Lecture 8 15:00  16:00 Coffee break 16:00  17:30 Lecture 9 & Closing
Venue: #435437, 4F, Main Research Building
Event Official Language: English

Seminar
Exploring interior magneticfield in neutron stars
July 25 (Tue) at 10:00  12:00, 2023
Yasufumi Kojima (Emeritus Professor, Hiroshima University)
Neutron stars are well known as a good laboratory to test highdensity material. Magnetic field on the stars is relevant to some astrophysical phenomena, and understanding the effect is crucial to extract information of the stellar interior. In this talk, I start with discussing some evidence and implications for intense magnetic field, and focus on the magnetoelastic equilibrium in the solid crust. The study leads to upper limit of deformation, and beyond a threshold crustal fracture observed burst on strongly magnetized neutron stars. The model is still primitive, and further development is desirable to connect microphysics with astrophysical observation.
Venue: via Zoom (Main Venue) / #345, 3F, Main Research Building, RIKEN Wako Campus
Event Official Language: English

Seminar
Electronic instabilities emerging from higherorder van Hove singularities
July 24 (Mon) at 17:00  18:15, 2023
Xinloong Han (Postdoctoral Fellow, Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, China)
Time: 5pm ~ 6:15pm (JST); 10am ~ 11:15am (CET); 4pm ~ 5:15pm (Taiwan) Field: condensed matter physics Keywords: topological superconductor, Van Hove singularity, Hubbard model, Kagome lattices Abstract: Competing correlated electronic states are a central topic in condensed matter physics. A typical example is the close competition between spin density wave and dwave superconductivity in the Hubbard model on the square lattice near half filling where the band structures have saddle points at which the Fermi surface topology changes from hole type to electron type. The saddle points are called van Hove singularity (VHS) points, and host diverging density of states with powerlaw behavior in the two dimensions. Recently, another type of VHS, namely the higherorder VHS was investigated in ABCstacked trilayer graphene and twisted bilayer graphene. In this talk, I will first introduce the higherorder VHS, and make comparisons to the conventional VHS. Then I will discuss the enhanced nematicity driven by large flavor number with higherorder VHSs on the square and Kagome lattices. Finally, I will show that robust topological superconductivity can emerge on the square lattice due to interplay of spinorbital coupling and higherorder VHSs.
Venue: Hybrid Format (Common Room 246248 and Zoom)
Event Official Language: English

The 23rd MACS Colloquium
July 14 (Fri) at 14:45  18:00, 2023
Tetsushi Ito (Associate Professor, Division of Mathematics and Mathematical Sciences, Graduate School of Science, Kyoto University)
Aya Ishihara (Professor, International Center for Hadron Astrophysics / Institute for Advanced Academic Research, Chiba University)14:4515:00 Teatime discussion 15:0016:00 Talk by Dr. Tetsushi Ito (Associate Professor, Division of Mathematics and Mathematical Sciences, Graduate School of Science, Kyoto University) 16:1517:15 Talk by Prof. Aya Ishihara (Professor, International Center for Hadron Astrophysics / Institute for Advanced Academic Research, Chiba University) 17:1518:00 Discussion
Venue: Maskawa Hall, 1F, Maskawa Building for Education and Research
Event Official Language: Japanese

Seminar
Evolution of dormant egg production and their hatching rate in Aedes albopictus
July 13 (Thu) at 16:00  17:00, 2023
Yusuke Kuwano (Ph.D. Student, The Graduate University for Advanced Studies (SOKENDAI))
Mosquitoes are important insect vectors of infectious diseases in humans, and knowledge of their population dynamics is pivotal in disease control. Some mosquito species have dormancy in their life history to survive harsh environments. However, the population dynamics of mosquitoes have not yet been well understood due to the lack of field and experimental data on dormancy. For that reason, I modeled the population dynamics of mosquitoes that face environmental fluctuations and examine the evolution of egg dormancy strategy to survive harsh periods. I found that the ESS dormancy fraction monotonically increases with the period of environmental fluctuation. Next, I analyzed evolutionary traits of the dependence of the dormancy rate and the hatching rate from dormant egg on soil moisture content and conducted evolutionary simulations using actual weather measurement in Tokyo. The results of the hatching rate from dormant egg showed that two mosquito phenotypes having distinctly different responses to soil moisture were selected.
Venue: via Zoom
Event Official Language: English

Seminar
Conserved charges in the quantum simulation of integrable spin chains
July 12 (Wed) at 13:30  15:00, 2023
Juan William Pedersen (Ph.D. Student, Graduate School of Arts and Sciences, The University of Tokyo)
In this talk, we present the result of the quantum simulation of the spin1/2 Heisenberg XXX spin chain. We implement the integrable Trotterization algorithm, which allows us to control the Trotter error with conserved charges remaining conserved, on a real quantum computer and classical simulators. We study the effects of quantum noise on the time evolution of several conserved charges and specifically observe the decay of the expectation values. Our work improves our understanding of quantum noises and can potentially be applied to benchmark quantum devices and algorithms.
Venue: Seminar Room #359 (Main Venue) / via Zoom
Event Official Language: English

The eyes have it: Influenza virus infection beyond the respiratory tract
July 11 (Tue) at 14:00  15:30, 2023
Jessica Belser (Research Microbiologist, Influenza Division, US Centers for Disease Control and Prevention (CDC), USA)
Influenza viruses are typically considered a respiratory pathogen, but are nonetheless capable of causing ocular complications in infected individuals and establishing a respiratory infection following ocular exposure. While both human and zoonotic influenza A viruses can replicate in ocular tissue and use the eye as a portal of entry, many H7 subtype viruses possess an ocular tropism in humans, though the molecular determinants that confer a nonrespiratory tropism to a respiratory virus are poorly understood. In this presentation, I will discuss the establishment of several mammalian models to study ocular exposure and ocular tropism, ongoing investigations conducted in vitro and in vivo to elucidate properties associated with oculartropic viruses, and ways in which this information can improve efforts to identify, treat, and prevent human infection following ocular exposure to influenza viruses. Continued investigation of the capacity for respiratory viruses to gain entry to the respiratory tract and to cause ocular complications will improve understanding of how these pathogens cause human disease, regardless of the virus subtype or exposure route.
Venue: Okochi Hall / via Zoom
Event Official Language: English

Seminar
Searching for dark matter subhalos in the FermiLAT catalog with Bayesian neural networks
July 10 (Mon) at 16:30  18:00, 2023
Slivia Manconi (Marie SkłodowskaCurie Fellow, Laboratoire d'AnnecyLeVieux de Physique Theorique (LAPTh), CNRS, France)
Machine learning techniques are powerful tools to tackle diverse tasks in current astroparticle physics research. For example, Bayesian neural networks provide robust classifiers with reliable uncertainty estimates, and are particularly well suited for classification problems that are based on comparatively small and imbalanced data sets, such as the gammaray sources detected by FermiLarge Area Telescope (LAT). About one third of the gammaray sources collected in the most recent catalogs remain currently unidentified. Intriguingly, some of these could be exotic objects such as dark subhalos, which are overdensities in dark matter halos predicted to form by cosmological Nbody simulations. If they exist in the Milky Way, they could be detected as gammaray point sources due to the annihilation or decay of dark matter particles into Standard Model final states. In this talk I will discuss our recent work* in which, after training on realistic simulations, we use Bayesian neural networks to identify candidate dark matter subhalos among unidentified gammaray sources in FermiLAT catalogs. Our novel framework allows us to derive conservative bounds on the dark matter annihilation cross section, by excluding unidentified sources classified as astrophysicallike.
Venue: via Zoom
Event Official Language: English
165 events in 2023
Events
Categories
series
 iTHEMS Colloquium
 MACS Colloquium
 iTHEMS Seminar
 iTHEMS Math Seminar
 DMWG Seminar
 iTHEMS Biology Seminar
 iTHEMS Theoretical Physics Seminar
 Information Theory SG Seminar
 Quantum Matter Seminar
 ABBLiTHEMS Joint Astro Seminar
 MathPhys Seminar
 Quantum Gravity Gatherings
 RIKEN Quantum Seminar
 Quantum Computation SG Seminar
 DEEPIN Seminar
 NEW WG Seminar
 LabTheory Standing Talks
 QFTcore Seminar
 STAMP Seminar
 QuCoIn Seminar
 Number Theory Seminar
 BerkeleyiTHEMS Seminar
 iTHEMSRNC Meson Science Lab. Joint Seminar
 AcademicIndustrial Innovation Lecture
 RIKEN Quantum Lecture
 Theory of Operator Algebras
 iTHEMS Intensive CourseEvolution of Cooperation
 Introduction to PublicKey Cryptography
 Knot Theory
 iTHES Theoretical Science Colloquium
 SUURICOOL Seminar
 iTHES Seminar