Presentations in International Conferences and Meetings

Hajime Torii

[2024]

H. Torii, "Elucidating the characteristics of halogen bonding through analyses of electron densities"
8th JCS International Symposium on Theoretical Chemistry, Sapporo, June 2024 (invited talk).

[2023]

H. Torii, "Capturing intermolecular interactions as images: Electron density analysis on halogen- and hydrogen-bonding systems"
Inter-Academia 2023, Hamamatsu, September 2023 (oral).

H. Torii, "Roles of electrostatics and intermolecular electronic motions in the structural and spectroscopic features of hydrogen- and halogen-bonded systems"
38th International Conference on Solution Chemistry (38ICSC), Belgrade [video participation], July 2023 (plenary lecture).

[2022]

H. Torii, "Elucidating electrostatic characteristics of halogen bonding through analyses of electron densities"
5th International Symposium on Halogen Bonding (ISXB5), Kisarazu, November 2022 (oral).

K. Saito and H. Torii, "Hydrogen-bond configurations of hydrogen fluoride in relation to the hidden halogen-bonding ability"
37th International Conference on Solution Chemistry (37ICSC), Zoom (Bogota, Colombia), July 2022 (oral).

[2021]

H. Torii, "What electron densities and their changes tell us about intermolecular interactions"
17th International Conference of Computational Methods in Sciences and Engineering (ICCMSE 2021), Video on demand (Crete, Greece), September 2021 (plenary lecture).

H. Torii and R. Ukawa, "Role of intermolecular charge fluxes in the hydrogen-bond-induced frequency shifts of the OH stretch of water"
20th International Conference on Time Resolved Vibrational Spectroscopy (TRVS 2021), Zoom (Ann Arbor, MI), June 2021 (poster).

[2019]

H. Torii, "Dynamical behavior of intermolecular charge flux related to the THz spectra of hydrogen-bonded liquids"
19th International Conference on Time Resolved Vibrational Spectroscopy (TRVS 2019), Auckland, September 2019 (oral).

H. Torii, "Vibrational spectroscopy empowered by theoretical analysis: The principles and a few example cases"
10th International Conference on Advanced Vibrational Spectroscopy (ICAVS-10), Auckland, July 2019 (invited talk).

[2018]

H. Torii, "Electrostatic understanding and modeling of the solvation-induced changes in the vibrational frequencies and the NMR chemical shifts"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Nagoya, November 2018 (poster).

H. Ito and H. Torii, "A model for electrostatic polarization of hydrogen-bonded water based on electron density variations"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Nagoya, November 2018 (poster).

[2017]

H. Torii, "Behavior of electrons generating THz spectral intensities of liquid formamide"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Vienna (Austria), September 2017 (oral).

H. Torii, "Electrostatics and intermolecular electronic motions determining the vibrational spectroscopic features of hydrogen-bonded systems"
Telluride SRC Workshop on Vibrational Dynamics, Telluride, July-August 2017 (invited talk).

[2016]

H. Torii, "Intramolecular polarizations, intermolecular charge fluxes, and infrared intensities of bio-related molecules and related systems"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Chania (Greece), September 2016 (oral).

H. Torii, "New twist in the theories on the electrostatic vibrational response of peptides and related systems"
Protein Electrostatics Berlin 2016, Berlin, July 2016 (oral).

H. Torii, "New twist in the theories on the secondary structure dependence and hydration effect of the vibrational properties of peptides"
International Conference of Computational Methods in Sciences and Engineering 2016, Athens (Greece), March 2016 (invited talk).

[2015]

H. Torii, "Out-of-Plane Hydration and Conformation Effects on the Vibrational Properties of the Peptide Group"
The 2015 International Chemical Congress of Pacific Basin Societies, Honolulu, December 2015 (invited talk).

H. Torii, "Theoretical study on the intensity generation mechanisms of the terahertz spectrum of liquid water"
Inter-Academia 2015, Hamamatsu, September 2015 (oral).

H. Torii, "A strategy for elucidating the mechanism of solvation-induced frequency shifts of vibrational modes"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Rostock, September 2015 (oral).

H. Torii, "A strategy for improving the map of hydration-induced frequency shifts of the amide I band"
17th International Conference on Time-Resolved Vibrational Spectroscopy, Madison, June 2015 (oral).

H. Torii, "Simulations of the THz spectrum of liquid water incorporating the effects of intermolecular charge fluxes through hydrogen bonds"
International Conference of Computational Methods in Sciences and Engineering 2015, Athens (Greece), March 2015 (invited talk).

[2014]

H. Torii, "Intermolecular charge transfer through hydrogen bonds and the resulting dipole moments evaluated with various methods"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Rome, September 2014 (oral).

H. Torii, "Theoretical approach to the intensity generation mechanisms of the terahertz spectrum of liquid water"
5th International THz-Bio Workshop, Seoul (Korea), April 2014 (invited talk).

[2013]

H. Torii, "The role of delocalized electrons in infrared and terahertz intensities of hydrogen- and halogen-bonding systems"
5th JCS International Symposium on Theoretical Chemistry, Nara, December 2013 (invited talk).

H. Torii, "Temperature dependence and potential function dependence of the terahertz spectral profiles of liquid water"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Lille, September 2013 (poster).

H. Torii, "Electron density modulations and the infrared intensities of some characteristic vibrational modes of the peptide group"
7th International Conference on Advanced Vibrational Spectroscopy (ICAVS-7), Kobe, August 2013 (invited talk).

H. Torii, "The role of delocalized electronic motions in infrared and terahertz intensities and related properties"
Telluride SRC Workshop on Vibrational Dynamics, Telluride, July 2013 (invited talk).

H. Torii, "Intermolecular electron density modulations and the terahertz spectral intensities of liquid water"
33rd International Conference on Solution Chemistry, Kyoto, July 2013 (oral).

H. Torii, M. G. Giorgini, and M. Musso, "Band merger and intensity bias in 1D and 2D vibrational spectra arising from coupling between different isotopic species"
16th International Conference on Time-Resolved Vibrational Spectroscopy, Beppu, May 2013 (oral).

[2012]

H. Torii, "Electronic reorganizations induced by intra- and intermolecular vibrational dynamics and spectral intensities in liquid water"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Eger, September 2012 (oral).

[2011]

H. Torii, "Resonantly Delocalized Vibrational Dynamics and Intermolecular Electronic Motions Induced by the OH Stretching and Molecular Translation in Liquid Water"
Workshop on Dynamics and Structure of Water: From Gas Phase Clusters to Condensed Phase, Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, October 2011 (invited talk).

H. Torii, "How Are the Electronic Motions Coupled to Nuclear Motions in Liquids? The Cases of Water and Related Systems"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Warsaw, September 2011 (oral).

H. Torii, "Effects of Intermolecular Electron Density Modulations on the Terahertz Spectral Intensity of Liquid Water"
The Seventh Congress of the International Society for Theoretical Chemical Physics (ISTCP-VII), Tokyo, September 2011 (oral).

H. Torii, "Intermolecular Electron Density Modulations in Water Related to Vibrational Couplings and Intensities: OH Stretching and Terahertz"
15th International Conference on Time-Resolved Vibrational Spectroscopy, Ascona (Switzerland), June 2011 (oral).

H. Torii, "Spectroscopic Phenomena Arising from Resonant Intermolecular Vibrational Coupling and the Related Electronic Motions"
CECAM Workshop on "Vibrational Spectroscopy of Complex Systems", Paris, May 2011 (invited talk).

[2010]

H. Torii, "Effects of Halogen Bonding, Hydrogen Bonding, and Vibrational Coupling on the Linear and Nonlinear Vibrational Spectra of the Peptide Group, Water, and Related Systems"
The 2010 International Chemical Congress of Pacific Basin Societies, Honolulu, December 2010 (invited talk).

H. Torii, "Intra- and Intermolecular Charge Fluxes Induced by the OH Stretching Mode of Water and Their Effects on the Infrared Intensities and Intermolecular Vibrational Coupling"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Lviv (Ukraine), September 2010 (oral).

H. Torii, "Effects of Halogen Bonding, Hydrogen Bonding, and Liquid Dynamics on the Vibrational Modes and Spectra of the Peptide Group"
The Third International Symposium on Molecular Theory for Real Systems, Kyoto, January 2010 (invited talk).

[2009]

H. Torii, "Properties of Halogen Atoms for Representing Intermolecular Electrostatic Interactions Related to Halogen Bonding"
International Conference of Computational Methods in Sciences and Engineering 2009, Rhodes (Greece), September-October 2009 (Keynote lecture).

H. Torii, " Time-Domain Calculations of the 1D and 2D Spectra of Resonantly-Coupled Vibrations in Liquids and Proteins"
International Conference of Computational Methods in Sciences and Engineering 2009, Rhodes (Greece), September-October 2009 (oral).

H. Torii, "Nature of Vibrational Frequency Modulations and the Related One- and Two-Dimensional Vibrational Spectral Features Analyzed for the Amide I Mode of Tetraalanine in Aqueous Solution"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Salzburg (Austria), September 2009 (oral).

H. Torii, "Toward Efficient Time-Domain Calculations of 2D-IR Spectra"
14th International Conference on Time-Resolved Vibrational Spectroscopy, Meredith (New Hampshire, USA), May 2009 (oral).

[2008]

H. Torii, Y. Osada, and M. Iwami, "Merged and Separate Band Profiles Arising from Resonantly Coupled Vibrational Modes of Liquid Mixtures: Theoretical Study"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Lisbon (Portugal), September 2008 (poster).

H. Torii, "Time-Domain Theoretical Calculations of One- and Two-Dimensional Vibrational Spectra: Method and Applications"
The Fourth International Conference on Coherent Multidimensional Spectroscopy, Kyoto, August 2008 (invited talk).

H. Torii, "Structural and Dynamical Characteristics Related to Time- and Frequency-Domain Vibrational Spectroscopic Signals of Resonantly Coupled Many-Oscillator Systems: The Cases of Liquids and Biomolecules"
The Second International Symposium on Molecular Theory for Real Systems, Okazaki, August 2008 (invited talk).

H. Torii, "Scheme of Detecting Microscopic Inhomogeneity in Binary Liquid Mixtures Utilizing Resonantly Coupled Vibrational Modes"
7th Liquid Matter Conference, Lund (Sweden), June 2008 (poster).

H. Torii, "Polarized Raman Spectra, Rapid Decay of the Transient Infrared Absorption Anisotropy, and the Extent of Delocalization of the OH Stretching Mode of Liquid Water"
7th Liquid Matter Conference, Lund (Sweden), June 2008 (poster).

[2007]

H. Torii, "Time-domain theoretical analysis of the IR, polarized Raman, and 2D-IR spectra of peptide chains in aqueous solution"
The Post-symposium for the Joint Conference of JMLG/EMLG Meeting 2007 and 30th Symposium on Solution Chemistry of Japan, "Solution Chemistry; from Solvation to Biomolecules", Kyoto, November 2007 (invited talk).

H. Torii, "Scheme of detecting microscopic inhomogeneity in binary liquid mixtures utilizing resonantly coupled vibrational modes"
The Pre-symposium for the Joint Conference of JMLG/EMLG Meeting 2007 and 30th Symposium on Solution Chemistry of Japan, "A New Step in Solution Chemistry from Yokohama", Yokohama, November 2007 (invited talk).

H. Torii, "Time-domain theoretical analysis of the IR, polarized Raman, and 2D-IR spectra of peptide chains in aqueous solution"
13th International Conference on Time-Resolved Vibrational Spectroscopy, Freising (Germany), May 2007 (invited talk).

[2006]

H. Torii, M. G. Giorgini, and M. Musso, "Raman spectra and liquid structures of the N,N-dimethylformamide/carbon tetrachloride binary liquid mixtures"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Barcelona (Spain), September 2006 (poster).

H. Torii, "Time-domain calculations of the vibrational spectra of delocalized modes in liquid water and related systems"
XXth International Conference on Raman Spectroscopy (ICORS 2006), Yokohama, August 2006 (invited talk).

H. Torii, "Time-domain calculations of the polarized Raman spectra and the transient IR absorption anisotropy of the OH stretching mode of liquid water"
Thermo International 2006, Boulder (Colorado, USA), August 2006 (oral).

H. Torii, "A novel time-domain simulation method for polarized Raman and 2D-IR spectra of liquids and related systems"
12th International Congress of Quantum Chemistry (ICQC), Kyoto, May 2006 (poster).

[2005]

H. Torii, "Responses of molecular vibrations to electric fields and their effects on vibrational spectra"
International Conference of Computational Methods in Sciences and Engineering 2005, Loutraki (Greece), October 2005 (invited talk in a symposium).

H. Torii, "A novel time-domain simulation method for polarized Raman and 2D-IR spectra of liquids and related systems"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Prague (Czech), September 2005 (oral).

H. Torii, M. Musso, and M. G. Giorgini, "Noncoincidence effect, diagonal frequency shift, and the extent of delocalization of the C=O stretching mode of acetone/DMSO binary liquid mixtures"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Prague (Czech), September 2005 (poster).

H. Torii, "Effects of delocalization and frequency fluctuations of vibrational modes in polarized Raman and 2D-IR spectra"
The 3rd International Conference on Advanced Vibrational Spectroscopy (ICAVS-3), Delavan (Wisconsin, USA), August 2005 (oral).

H. Torii, "The effects of electrostatic interactions on the vibrational dynamics and spectra"
Seminar, Angewandte Statistische Physik und Simulation (ASPUS), University of Vienna, May 2005.

[2004]

H. Torii, "The role of atomic quadrupoles in intermolecular interactions: Toward better understanding of the structures of liquid mixtures and liquid-liquid interfaces"
Annual Meeting of the European/Japanese Molecular Liquids Groups (EMLG/JMLG), Sheffield (UK), September 2004 (oral).

H. Torii, "Vibrational interactions of the amide I modes in the hydrogen-bonded peptide systems"
XIXth International Conference on Raman Spectroscopy (ICORS 19), Gold Coast (Australia), August 2004 (oral).

H. Torii, "Extent of delocalization of vibrational modes in liquids as a result of competition between diagonal disorder and off-diagonal coupling"
1st Asian Pacific Conference on Theoretical & Computational Chemistry, Okazaki, May 2004 (oral).

H. Torii, "New aspects of intermolecular electrostatic interactions obtained from ab initio MO calculations: The role of atomic quadrupoles"
Joint Conference of International Conference of Molecular Simulation and Computational Science Workshop 2004 (ICMS-CSW 2004), Tsukuba, January 2004 (oral).

[2003]

H. Torii, "Locally strong polarity in the solvent effect of nonpolar solvents containing third-row atoms: The role of atomic quadrupoles"
The 2nd International Conference on Advanced Vibrational Spectroscopy (ICAVS-2), Nottingham (UK), August 2003 (poster).

H. Torii, "Vibrational polarization and modulation of optical properties of retinal Schiff bases and other biologically related molecules"
H. Torii, "The role of atomic quadrupoles in intermolecular electrostatic interactions of polar and nonpolar molecules"
11th International Congress of Quantum Chemistry (ICQC), Bonn (Germany), July 2003 (posters).

[2002]

H. Torii, "Intermolecular resonant vibrational interaction and its manifestation in vibrational spectra"
Advanced Study Institute (ASI) on the Physical Chemistry of Liquids Entitled: Novel Approaches to the Structure and Dynamics of Liquids: Experiments, Theories and Simulations, Rhodes (Greece), September 2002 (oral).

H. Torii, "Extended dipole-induced dipole mechanism for generating Raman and optical Kerr effect intensities of low-frequency dynamics in liquids"
XVIIIth International Conference on Raman Spectroscopy (ICORS 18), Budapest (Hungary), August 2002 (poster).

[2001]

H. Torii, "The role of electrical property derivatives in intermolecular vibrational interactions and their effects on vibrational spectra"
The 1st International Conference on Advanced Vibrational Spectroscopy (ICAVS-1), Turku (Finland), August 2001 (plenary lecture).

H. Torii, "Ultrafast anisotropy decay of coherent excitations and the noncoincidence effect for delocalized vibrational modes in liquids"
10th International Conference on Time-Resolved Vibrational Spectroscopy, Okazaki, May 2001 (poster).

[2000]

H. Torii, "Raman noncoincidence effect, band broadening, and ultrafast dynamics for delocalized vibrational modes in liquids"
The 2000 International Chemical Congress of Pacific Basin Societies, Honolulu, December 2000 (oral).

H. Torii, "Intensity-carrying vibrational modes important for nonlinear optical properties derived from algebraic properties of intensity formulas"
The 2000 International Chemical Congress of Pacific Basin Societies, Honolulu, December 2000 (poster).

H. Torii, M. Musso, P. Ottaviani, A. Asenbaum, and M. G. Giorgini, "Liquid structures and the Raman noncoincidence effect in methanol/CCl₄ binary mixtures: Experimental and theoretical studies"
8th International Conference on Laser Applications in Life Sciences, Tokyo, August 2000 (poster).

H. Torii, "Intensity-carrying modes important for vibrational polarizabilities and hyperpolarizabilities of conjugated p-electron systems"
8th International Conference on Laser Applications in Life Sciences, Tokyo, August 2000 (invited talk).

H. Torii, "Theoretical study on the ultrafast anisotropy decay of coherent excitations and the noncoincidence effect for delocalized vibrational modes in liquids"
2000 Gordon Conference on Vibrational Spectroscopy and Molecular Dynamics, Newport (Rhode Island, USA), August 2000 (poster).

H. Torii, "Electron-vibration interactions in conjugated p-electron systems important for infrared and Raman intensities and vibrational contributions to hyperpolarizabilities"
10th International Congress of Quantum Chemistry, Menton (France), June 2000 (poster).

[1999]

H. Torii, "Liquid structures and the infrared and isotropic/anisotropic Raman noncoincidence in liquid methanol, a methanol-LiCl solution, and a solvated electron in methanol"
The Okazaki COE conference "International Symposium on Interplay of Theories and Experiments in Structural Analyses of Molecular Clusters", Okazaki, December 1999 (poster).

H. Torii, "Intensity-carrying vibrational modes important for nonlinear optical properties derived from algebraic properties of intensity formulas"
International Workshop on Molecular Design of Photonic Materials (MDPM99), Takarazuka, December 1999 (oral).

H. Torii, "Liquid structures and the infrared and isotropic/anisotropic Raman noncoincidence in liquid methanol, a methanol-LiCl solution, and a solvated electron in methanol"
12th International Conference on Fourier Transform Spectroscopy (ICOFTS-12), Tokyo, August 1999 (poster).

H. Torii, "Symmetry breaking in conjugated p electron systems induced by electrostatic intermolecular interactions"
5th World Congress of Theoretically Oriented Chemists (WATOC 99), London (UK), August 1999 (poster).

H. Torii and M. Tasumi, "Low-wavenumber vibrational dynamics and the noncoincidence effect of formamide and related molecules in the liquid state"
9th International Conference on Time-Resolved Vibrational Spectroscopy, Tucson (Arizona, USA), May 1999 (poster).

[1998]

H. Torii, "Vibrational interactions in peptides, proteins, and related hydrogen-bonded systems: Its importance in the interpretation of vibrational spectra"
7th International Conference on Laser Applications in Life Sciences, Bratislava (Slovak Republic), August 1998 (invited talk).

H. Torii, M. Tasumi, I. M. Bell, and R. J. H. Clark, "Effect of the Jahn-Teller distortion in an excited electronic state on Raman intensities"
The Okazaki COE conference on "Molecular Science of Excited States and Nonadiabatic Transitions", Okazaki, March 1998 (poster).

H. Torii and M. Tasumi, "Liquid structure and low-frequency vibrational dynamics and spectra of hydrogen-bonding liquids"
The 61st Okazaki Conference, Okazaki, January 1998 (poster).

[1997]

H. Torii and M. Tasumi, "Coupling between Amide I Vibrations of Neighboring Peptide Groups and Conformation of an Extended Helix"
Eleventh International Conference on Fourier Transform Spectroscopy, Athens (Georgia, USA), August 1997 (poster).

H. Torii and M. Tasumi, "A theory for electron-vibration interactions and infrared intensities of conjugated p-electron systems: Charged polyenes, conjugated schiff bases, and peptides"
H. Torii, M. Tasumi, I. M. Bell, and R. J. H. Clark, "Effect of the Jahn-Teller distortion in the excited electronic state on the Raman intensities of the tetrathiosquarate ion"
H. Torii and M. Tasumi, "Liquid structure, Raman noncoincidence, and low-frequency vibrational spectrum of formamide"
H. Torii, Y. Ueno, A. Sakamoto, and M. Tasumi, "Electron-vibration interactions and infrared intensities of the radical cations of polycyclic aromatic hydrocarbons"
9th International Congress of Quantum Chemistry, Atlanta (Georgia, USA), June 1997 (posters).

[1996]

H. Torii, "Recent advances in theoretical analyses of vibrational spectra - From small molecules to proteins and liquid systems"
XVth International Conference on Raman Spectroscopy, Pittsburgh (Pennsylvania, USA), August 1996 (invited talk).

[1995]

H. Torii, T. Tatsumi, and M. Tasumi "Recent advances in theoretical analyses of resonance Raman intensities"
The 1995 International Chemical Congress of Pacific Basin Societies, Honolulu, December 1995 (poster).

H. Torii and M. Tasumi "Electron-vibration coupling and charge fluxes as the origin of infrared intensities in the ground and excited electronic states: Charged polyenes, conjugated Schiff bases, and peptides"
The International Symposium New developments in Ultrafast Time-Resolved Vibrational Spectroscopy, Tokyo, December 1995 (invited talk).

H. Torii, T. Tatsumi, and M. Tasumi, "Effects of hydrogen bonding and solvation in dielectric media on the amide I frequencies: Ab initio molecular orbital study"
Tenth International Conference on Fourier Transform Spectroscopy, Budapest (Hungary), August 1995 (poster).

[1994]

H. Torii and M. Tasumi, "Raman Noncoincidence Effect and Intermolecular Interactions in Liquid Dimethyl Sulfoxide: Simulations Based on the Transition Dipole Coupling Mechanism and Liquid Structures Derived by Monte Carlo Method"
International Symposium on Molecular Simulation, Fukui, November 1994 (oral).

H. Torii, "Local order and transition dipole coupling in liquid methanol and acetone as the origin of the Raman noncoincidence effect"
XIVth International Conference on Raman Spectroscopy, Hong Kong, August 1994 (poster).

H. Torii, "Theoretical analyses of Raman intensities and polarization-dependent frequencies of Raman bands"
The Fourth Annual UT-SNU Chemistry Conference, Tokyo, March 1994 (oral).

[1993]

H. Torii "Model calculations on the amide-I infrared bands of globular proteins"
Ninth International Conference on Fourier Transform Spectroscopy, Calgary (Canada), August 1993 (invited talk in the round table discussion and poster).

H. Torii and M. Tasumi, "Transition dipole coupling in the Raman noncoincidence effect of liquid methanol and acetone"
The Third World Congress of Theoretical Organic Chemists (WATOC '93), Toyohashi, July 1993 (poster).

[1992]

H. Torii and M. Tasumi, "Model calculations on the amide-I infrared bands of globular proteins"
The Second International Conference & Exhibition on Computer Applications to Materials and Molecular Science and Engineering (CAMSE '92), Yokohama, September 1992 (poster).

[1989]

H. Torii and M. Tasumi, "Effects of distortion of vibrational wavefunctions on the vibrational relaxation of polyatomic molecules in the liquid phase"
The 1989 International Chemical Congress of Pacific Basin Societies, Honolulu, December 1989 (poster).