交流によって自然と社会をとり戻す : 大学と地域の交流・協働《特別論文》

The author has attempted to do so-called communicative lectures during last year in which university is concerned with local communities and university students communicate with people living in the communities. Through the lectures, the author and students had pleasant opportunities to meet with many people in the communities and learn from them. After conducting the communicative lectures, my impression is that the Saitama University, as a national university which may have a significant influence on local communities, will play an important role in revitalizing or forming communities. Realization of the communicative lectures is deeply related to my past teaching activities. The author was attracted by superior thought of organic agriculture, and conducted lectures and seminars in which students experienced organic agriculture and thought of what organic agriculture is. The communicative lectures were conducted as follows last fiscal year; In the first semester, students arranged a walking tour of Minuma rice field with their guide. In the second semester, students made and presented a picture-story show. In addition, they visited the area polluted and damaged by the Ashio copper mines. Students actively participated in the lectures, and discovered the pleasure of communicating with people in the communities. They were led to consider on their own will what community ought to be. This paper points out that university, through communicative lectures, might assume a significant role of regaining a society which is gentle and friendly to human and nature.textapplication/pdfdepartmental bulletin pape

Low-Complexity Channel Tracking and Coordinated Multi-Point Transmission for Highly-Reliable Communications over Frequency Selective Millimeter-Wave Channels

電気通信大学修士2022本論文では，周波数直交分割多重（OFDM: Orthogonal Frequency Division Multiplexing）を用いたミリ波通信システムに着目し，広帯域かつ高信頼な通信を実現するための，1)通信路に整合したビームの継続的な形成，2)突発的な伝播経路遮蔽の影響の抑圧，という2つの課題について議論する．課題1)の達成には，通信路状態情報の時間変動を，わずかなオーバーヘッドで高精度に追従するための通信路追従法を検討する．具体的には，到来角と発射角の時間相関を活用して観測行列を設計することで，圧縮センシングに基づいた低演算な通信路追従手法を提案する．提案手法を用いた通信路状態情報の更新と，それに基づいたビームの再形成によって，従来手法より少ない演算量で高い周波数利用効率を維持可能であること示す．課題2)に対しては，遮蔽予測から得られた事前情報と，複数の基地局を利用した多地点協調伝送法を検討する．特に，伝播経路遮蔽とOFDMの双方を考慮した総和アウテージ確率最小化問題を定式化し，伝送レートのアウテージ確率を最小化するビームフォーミング・各サブキャリアへの伝送レートおよび電力勘当の同時設計を提案する．提案した同時設計手法は，伝播経路遮蔽に加え，周波数選択性の影響を受ける通信路においても，通信品質保証を実現可能であることを示す．thesi

Observation of a Resonancelike Structure in the π^+-Ψ' Mass Distribution in Exclusive B → Kπ^+-Ψ' Decays

A distinct peak is observed in the π^±Ψ'invariant mass distribution near 4.43 GeV in B→ Kπ^±Ψ' decays. A fit using a Breit-Wigner resonance shape yields a peak mass and width of M = 4433± 4(stat)± 2(syst) MeV and Γ= 45\begin+18\-13\end(stat)\begin+30\-13\end(syst)MeV.The product branching fraction is determined to be B(B^0→ K^∓Z^±(4430)→ π^±Ψ')= (4.1±1.0(stat)±1.4(syst))×10^{-5}, where Z^±(4430)is used to denote the observed structure. The statistical significance of the observed peak is 6.5σ. These results are obtained from a 605 fb^{-1} data sample that contains 657 ×10^6 B\bar{B} pairs collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e^+e^- collider.journal articl

Search for CP Violation in the Decay B0→D*±D∓

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Water Evaporation: A Transition Path Sampling Study

We use transition path sampling to study evaporation in the SPC/E model of liquid water. On the basis of thousands of evaporation trajectories, we characterize the members of the transition state ensemble (TSE), which exhibit a liquid–vapor interface with predominantly negative mean curvature at the site of evaporation. We also find that after evaporation is complete, the distributions of translational and angular momenta of the evaporated water are Maxwellian with a temperature equal to that of the liquid. To characterize the evaporation trajectories in their entirety, we find that it suffices to project them onto just two coordinates: the distance of the evaporating molecule to the instantaneous liquid–vapor interface and the velocity of the water along the average interface normal. In this projected space, we find that the TSE is well-captured by a simple model of ballistic escape from a deep potential well, with no additional barrier to evaporation beyond the cohesive strength of the liquid. Equivalently, they are consistent with a near-unity probability for a water molecule impinging upon a liquid droplet to condense. These results agree with previous simulations and with some, but not all, recent experiments

Synthesis of pentacene-, tetracene- and anthracene bisimides using double-cyclization reaction mediated by bismuth(iii) triflate

Novel bisimide-fused acenes were synthesized viabismuth triflate mediated double-cyclization reaction of acid chlorides and isocyanates. Their optical and electrical properties revealed significantly smaller HOMO-LUMO gaps compared with those of their parent acenes. Fabricated OFET based on tetracene bisimide showed n-type OFET outputs.journal articl

Effect of Inert Tails on the Thermodynamics of DNA Hybridization

The selective hybridization of DNA is of key importance for many practical applications such as gene detection and DNA-mediated self-assembly. These applications require a quantitative prediction of the hybridization free energy. Existing methods ignore the effects of non-complementary ssDNA tails beyond the first unpaired base. We use experiments and simulations to show that the binding strength of complementary ssDNA oligomers is altered by these sequences of non-complementary nucleotides. Even a small number of non-binding bases are enough to raise the hybridization free energy by approximately 1 kcal/mol at physiological salt concentrations. We propose a simple analytical expression that accounts quantitatively for this variation as a function of tail length and salt concentration

Sitting at the Edge: How Biomolecules use Hydrophobicity to Tune Their Interactions and Function

Water near extended hydrophobic surfaces is like that at a liquid–vapor interface, where fluctuations in water density are substantially enhanced compared to those in bulk water. Here we use molecular simulations with specialized sampling techniques to show that water density fluctuations are similarly enhanced, even near hydrophobic surfaces of complex biomolecules, situating them at the edge of a dewetting transition. Consequently, water near these surfaces is sensitive to subtle changes in surface conformation, topology, and chemistry, any of which can tip the balance toward or away from the wet state and thus significantly alter biomolecular interactions and function. Our work also resolves the long-standing puzzle of why some biological surfaces dewet and other seemingly similar surfaces do not

Comparisons with Empirical and Simulation Data

<div><p>(A) and (B) Plots of relative EHH versus frequency for <i>CCR5</i> in comparison to HapMap data (release 16) for Chromosome 3 in European-Americans (A) and 1,000 simulations of 400 chromosomes in European-Americans (B). Green dots represent the comparison haplotypes and the lines represent, from bottom to top, the 50th, 75th, 95th, and 99th percentiles. The red dots represent the results for eight <i>CCR5-</i>Δ<i>32</i>-bearing chromosomes in (A) and 32 <i>CCR5-</i>Δ<i>32</i>-bearing chromosomes in (B) for the centromere-proximal side, and the blue dots represent results for the centromere-distal side.</p> <p>(C) EHL of the haplotypes of frequency 6%–10% from the HapMap (solid green line) and from simulations (dotted green line) in comparison to <i>CCR5-</i>Δ<i>32</i> (red line).</p></div

EHH Breakdown of EHH over Distance between the <i>CCR5-</i>Δ<i>32</i> Mutation and 63 SNPs at Increasing Distances from the Mutation

<div><p>(A) Map of SNPs typed.</p> <p>(B) Comparison between Δ<i>32</i> and a single non-Δ<i>32</i> class of haplotypes. It should be noted that the Δ<i>32</i>-bearing chromosomes appear (red) to have greatly extended LD compared to the non-Δ<i>32</i>-bearing chromosomes (black).</p> <p>(C) Breakdown using the eight-marker haplotype containing the Δ<i>32</i> mutation. There are five haplotypes in European-Americans (frequencies: 42%, 31%, 10%, 8%, and 8%, respectively). Full haplotype sequences and frequencies in other populations are given in <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0030378#st003" target="_blank">Table S3</a>. Notice that two of the non-Δ<i>32</i>-bearing chromosomes (black) appear to have the similar extended LD when compared to the Δ<i>32</i>-bearing chromosomes centromere-distal to <i>CCR5</i> (red). Centromere-proximal Δ<i>32</i>-bearing chromosomes still have the most extended LD, indicated with an arrow.</p></div