On Plural Anaphora

( Kiyoshi Ishikawa ) 한국언어정보학회 1998 국제 워크샵 Vol.1998 No.-

In order to formulate truth-conditionally satisfactory semantics in a compost-tional manner, model-theoretic semanticists sometimes posit morphology-semantics mismatches. Among them are Kamp and Reyle (1993), who occasionally ignore English plural morphology in constructing their analysis of anaphora. Our goal in this paper is to demonstrate that natural language morphology is a better guide for a compositional semantics than Kamp and Ryle assume. By refining the semantics of plurality put forth in Ishikawa (1995a), we construct an analysis of plural anaphora in a way that respects English plural morphology. Our results suggest that natural language morphology is not as redundant as usually assumed.

Lexicogrammar of the L2 English Essays Written by Asian College Students: A Corpus-Based Study

Shin’ichiro Ishikawa 아시아테플 2024 The Journal of Asia TEFL Vol.21 No.1

本研究においては、中間言語対照分析(Granger, 1996, 2015)および多次元分析法(Biber, 1988) という2つの手法を組み合わせ、International Corpus Network of Asian Learners of English (ICNALE; Ishikawa, 2023)から採取されたアジア圏大学生(中国・インドネシア・日本・大韓 民国・台湾・タイ)および英語母語話者の作文を比較した。次元スコア・主要語彙文法特性 ・クラスタリング・統計的分類に基づく分析により、学習者の作文は母語話者のものより情 報性・語り性・明示的表出性・抽象性・時間制約性が低く、学習者の作文の語彙文法特性は 習熟度よりも国・地域に影響されていること、学習者作文は口語的・個人的、対人的・説得 的、静的・描写的動的・反芻的の4 タイプに分類されることなどが示された。これらの結果 は、アジア圏学習者のL2英語使用の理解に新しい光を投げかけるものである。

韓国学習者の日本語動詞獲得モデル: 学習者総体モデルとの比較 ― 「多言語母語の日本語学習者横断コーパス」の絵描写作文を用いた検証 ―

石川慎一郎 ( Shin’ichiro¸ Ishikawa ) 한국일어교육학회 2021 일본어교육연구 Vol.- No.56

本論文では「多言語母語の日本語学習者横断コーパス」(I-JAS)に含まれる韓国学習者(KLJ)による絵描写作文を習熟度レベルごとに分析し、KLJの動詞獲得過程のモデル化を試みた。分析結果は、同コーパスに含まれる海外日本語学習者の総体(WLJ)データを分析した石川(2021)と比較された。RQ1(動詞使用量)については、習熟度別に見た場合、KLJとWLJともに逆U字型のパタンを示すことが確認された。RQ2(マーカー動詞)に関して、母語話者との比較の結果、KLJが使用できない動詞には(a)複合動詞,(b)慣用動詞、(c)否定的ニュアンスを含む動詞など、KLJのみが使用する動詞には(d)意思·意図に関する誤用、(e)文脈の不適合、(f)複合動詞要素の誤用、(g)不要な内容の言語化などが含まれ、いずれもWLJと同じパタンを示すことが確認された。RQ3(習熟度分類)については、KLJの動詞獲得がⅠ(存在動詞·移動動詞など)→Ⅱ(動詞の拡張)→Ⅲ(複合動詞成分·アスペクト成分·サ変動詞など)→Ⅳ(高度な複合動詞成分·変化動詞など)の4段階に区分され、ほぼWLJに重なることが示された。RQ4(習熟度推定)については、7種の動詞(入る·為る·見る·仕舞う·知る·来る·入れる)の使用頻度によって習熟度を63%の精度で予測できるが、予測モデルに含まれる動詞はWLJの場合とは異なることが示された。動詞獲得におけるKLJの固有特性は限定的で、KLJの特徴の大部分は日本語学習者全般の特徴であると言える。この点をふまえれば、日本語学習者コーパス研究においては、L1差よりもL2習熟度差を優先した分析が必要だと考えられる。 Using the International Corpus of Japanese as a Second Language (I-JAS), this study analyzed the picture description essays written by Korean learners of Japanese (KLJ) at different L2 proficiency levels to explore the process of their acquisition of L2 Japanese verbs. The results were compared to the verb acquisition process of the whole learners of Japanese (WLJ) reported in Ishikawa (2021). The corpus-based analyses showed that (1) an inverted U pattern existed in terms of the number of tokens/ types of the verbs used in the essays for both KLJ and WLJ, (2) when compared to the verb usage of Japanese native-speakers (JNS), some verbs were used only by JNS and others only by KLJ, and these “marker” verbs were almost the same for KLJ and WLJ, (3) KLJ’s verb acquisition process could be subdivided into four stages: 1 (existential verbs/ verbs of moving), 2 (a greater variety of verbs), 3 (composite verbs and aspectual verbs), and 4 (complex composite verbs and verbs of change), which were almost identical to the patterns for WLJ, and (4) KLJ’s L2 proficiency could be explained by the frequency of seven types of verbs (hairu, suru, miru, shimau, shiru, kuru, ireru) with 63% accuracy, though these verbs were different from a set of verbs adopted in the regression model for WLJ. These findings corroborated that KLJ’s verb acquisition pattern did not differ much from the pattern for WLJ, which may suggest the need for the Japanese learner corpus studies focusing on learners’ L2 proficiency rather than on their L1 types.

Numerical and Experimental Simulation on Bubble Plume Behaviour in Stratified Flow

Ishikawa, Atsuhiro,Sato, Toru,Nakashiki, Norikazu The Korean Association of Ocean Science and Techno 2005 Journal of Ocean Science and Technology Vol.2 No.1

We developed a 3D Eulerian-Lagrangian two-phase CFD code, which can cope with distributions of bubble radius. The simulation results were compared moderately well with those of bubbling experiments conducted in a channel for circulating stratified water. It was elucidated how the difference of the simulation conditions effects the behaviour of bubbles, dye distribution, and the intrusion of dissolved $CO_2$ into the stratification. From the results, suggested is the possibility of the code to apply to the behaviour of $CO_2$ droplets released in the deep ocean for sequestering the greenhouse gas.

Growth and Photosynthetic Responses of One C₃and Two C₄Chenopodiaceae Plants to Three CO₂Concentration Conditions

Ishikawa, Shin-Ichi 한국생태학회 2008 Journal of Ecology and Environment Vol.31 No.4

Growth and photosynthetic responses of one C₃and two C₄plants in the family Chenopodiaceae in three CO₂concentration ([CO₂]) conditions-low (about 243 μmol mol-1, LC), present (about 378, PC), and high (about 465, HC)-were investigated in open top chambers. The relative growth rate (RGR) and net assimilation rate in the C₃plant, Chenopodium album, increased with increasing [CO₂], though the RGR was not enhanced significantly in the HC condition. The leaf area ratio and leaf weight ratio of the C₃plant drastically decreased with increasing [CO₂], suggesting that the C₃plant invests more biomass to leaves in lower [CO₂] conditions. The two C₄plants, Atriplex glauca and A. lentiformis, showed relatively small changes in those growth parameters. These photosynthetic-pathway-dependent responses suggest that growth patterns of C₃and C₄plants have been altered by past increases in atmospheric [CO₂] but that there will be relatively little further alteration in the future high-CO₂world. Growth and photosynthetic responses of one C₃and two C₄plants in the family Chenopodiaceae in three CO₂concentration ([CO₂]) conditions-low (about 243 μmol mol-1, LC), present (about 378, PC), and high (about 465, HC)-were investigated in open top chambers. The relative growth rate (RGR) and net assimilation rate in the C₃plant, Chenopodium album, increased with increasing [CO₂], though the RGR was not enhanced significantly in the HC condition. The leaf area ratio and leaf weight ratio of the C₃plant drastically decreased with increasing [CO₂], suggesting that the C₃plant invests more biomass to leaves in lower [CO₂] conditions. The two C₄plants, Atriplex glauca and A. lentiformis, showed relatively small changes in those growth parameters. These photosynthetic-pathway-dependent responses suggest that growth patterns of C₃and C₄plants have been altered by past increases in atmospheric [CO₂] but that there will be relatively little further alteration in the future high-CO₂world.

Presynaptic N-type and P/Q-type Ca²⁺channels mediating synaptic transmission at the calyx of Held of mice : Presynaptic N- and P/Q-type Ca²⁺currents

Ishikawa, Taro,Kaneko, Masahiro,Shin, Hee-Sup,Takahashi, Tomoyuki Wiley (The Physiological Society) 2005 The Journal of physiology Vol.568 No.1

<P>At the nerve terminal, both N- and P/Q-type Ca2+ channels mediate synaptic transmission, with their relative contribution varying between synapses and with postnatal age. To clarify functional significance of different presynaptic Ca2+ channel subtypes, we recorded N-type and P/Q-type Ca2+ currents directly from calyces of Held nerve terminals in alpha1A-subunit-deficient mice and wild-type (WT) mice, respectively. The most prominent feature of P/Q-type Ca2+ currents was activity-dependent facilitation, which was absent for N-type Ca2+ currents. EPSCs mediated by P/Q-type Ca2+ currents showed less depression during high-frequency stimulation compared with those mediated by N-type Ca2+ currents. In addition, the maximal inhibition by the GABAB receptor agonist baclofen was greater for EPSCs mediated by N-type channels than for those mediated by P/Q-type channels. These results suggest that the developmental switch of presynaptic Ca2+ channels from N- to P/Q-type may serve to increase synaptic efficacy at high frequencies of activity, securing high-fidelity synaptic transmission.</P>

ON THE RELATION OF ABOVE-THE-LOOP AND FOOTPOINT HARD X-RAY SOURCES IN SOLAR FLARES

Ishikawa, S.,Krucker, Sä,m,Takahashi, T.,Lin, R. P. IOP Publishing 2011 The Astrophysical journal Vol.737 No.2

<P>We report on the most prominent example of an above-the-loop hard X-ray source in the extensive solar flare database of RHESSI. The limb flare of 2003 October 22 around 20 UT resembles the famous Masuda flare, except that only one of the footpoint sources is visible with the other one occulted. However, even for this very prominent event, the above-the-loop source is only visible during one of the four hard X-ray peaks, highlighting the rare occurrence of above-the-loop sources that are equally bright as footpoint sources. The relative timing between the above-the-loop and footpoint sources shows that the coronal source peaks about 10 s before the footpoint source and decays during the time the footpoint source is most prominent. Furthermore, the derived number of non-thermal electrons within the above-the-loop source is large enough to provide the needed number of precipitating electrons to account for the footpoint emission over the duration of the hard X-ray peak. Hence, these observations support the simple scenario where bulk energization is accelerating all electrons within the above-the-loop source and precipitating electrons are emptying out of the above-the-loop source to produce the footpoint emissions.</P>

<i>SUZAKU</i>/WAM AND<i>RHESSI</i>OBSERVATIONS OF NON-THERMAL ELECTRONS IN SOLAR MICROFLARES

Ishikawa, Shin-nosuke,Krucker, Sä,m,Ohno, Masanori,Lin, Robert P. IOP Publishing 2013 The Astrophysical journal Vol.765 No.2

<P>We report on hard X-ray spectroscopy of solar microflares observed by the Wide-band All-sky Monitor (WAM), on board the Suzaku satellite, and by RHESSI. WAM transient data provide wide energy band (50 keV-5 MeV) spectra over a large field of view (similar to 2 pi sr) with a time resolution of 1 s. WAM is attractive as a hard X-ray solar flare monitor due to its large effective area (similar to 800 cm(2) at 100 keV, similar to 13 times larger than that of RHESSI). In particular, this makes it possible to search for high energy emission in microflares that is well below the RHESSI background. The WAM solar flare list contains six GOES B-class microflares that were simultaneously observed by RHESSI between the launch of Suzaku in 2005 July and 2010 March. At 100 keV, the detected WAM fluxes are more than similar to 20 times below the typical RHESSI instrumental background count rates. The RHESSI and WAM non-thermal spectra are in good agreement with a single power law with photon spectral indices between 3.3 and 4.5. In a second step, we also searched the RHESSI microflare list for events that should be detectable by WAM, assuming that the non-thermal power-law emission seen by RHESSI extends to >50 keV. From the 12 detectable events between 2005 July and 2007 February, 11 were indeed seen by WAM. This shows that microflares, similar to regular flares, can accelerate electrons to energies up to at least 100 keV.</P>

Simple Equivalent Circuit for Efficiency Calculation of Brushless DC Motors

Ishikawa, Takeo,Tsuji, Takuma,Hashimoto, Seiji,Kurita, Nobuyuki Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.1

This paper shows a calculation method of several types of loss and the efficiency of brushless DC motors coupled with a load system by using a simple equivalent circuit, in which copper loss, eddy current loss, hysteresis loss, friction loss, viscous loss, and inverter loss are taken into account. We clarify each loss and motor efficiency at different motor speeds and different output torques by using the Microsoft-Excel. Moreover, the calculated results are in good agreement with the measured ones.

Structural Control Aiming for High-performance SiC Polycrystalline Fiber

Ishikawa, Toshihiro,Oda, Hiroshi The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.6

SiC-polycrystalline fiber (Tyranno SA, Ube Industries, Ltd.) shows very high heat-resistance and excellent mechanical properties up to very high temperatures. However, further increase in the strength is required. Up to now, we have already clarified the relationship between the strength and the defect-size of the SiC-polycrystalline fiber. The defects are formed during the conversion process from the raw material (amorphous Si-Al-C-O fiber) into SiC-polycrystalline fiber. In this conversion process, a degradation of the Si-Al-C-O fiber and a subsequent sintering of the degraded fiber proceed as well, accompanied by a release of CO gas and compositional changes, to obtain the dense SiC-polycrystalline fiber. Since these changes proceed in each filament, the strict control should be needed to minimize residual defects on the surface and in the inside of each filament for achieving the higher strength. In this paper, the controlling factors of the fiber strength and the fine structure will appear.