| JaLCDOI | 10.18926/CTED/65060 |
|---|---|
| Title Alternative | Analysis of Online Lectures by Using Attendance Efficiency and Lecture Efficiency -An Attempt to Estimate the Optimal Online Lecture Duration- |
| FullText URL | cted_013_1.pdf |
| Author | Yamakawa, Junji| |
| Abstract | リアルタイム形式でオンライン講義を行い，その講義動画をアーカイブ提供する場合，受講生は複数回の受講が可能になるのと同時に必要な部分だけを選択して受講することが可能になる。この状況を数値化したものが受講効率Ae である(山川・高旗, 2022)。今回，新たに講義効率(Lecture efficiency, Le)を定義し，データサイエンスの手法に基づき，筆者が2020 年度から2022 年度の3 年間に実施した約100 回のオンライン講義のAe をLeを使った線形モデルおよび非線形モデルでモデリングして検討したところ，最適なオンライン講義動画の長さは法定講義時間に対して1/2 から2/3 であることが推定された。またこの際のAe は2.0 < Ae < 2.5 の範囲に収束した。これらを講義動画の平均視聴回数と併せて考察するとオンライン講義の受講者は複数回の視聴により約96 %の充足率でオンライン講義動画を視聴していると考えられることがわかった。 |
| Keywords | オンライン講義（Online lecture） 受講効率（Attendance efficiency） 講義効率（Lecture efficiency） |
| Publication Title | Bulletin of Center for Teacher Education and Development, Okayama University |
| Published Date | 2023-03-30 |
| Volume | volume13 |
| Start Page | 1 |
| End Page | 6 |
| ISSN | 2186-1323 |
| language | Japanese |
| Copyright Holders | Copyright © 2023 岡山大学教師教育開発センター |
| File Version | publisher |
| JaLCDOI | 10.18926/CTED/63296 |
|---|---|
| Title Alternative | An Investigation on “Ae” of Real-time Online Lecture at the Okayama university - Using the YouTube Live + OBS Studio and Google Classroom Web Applications |
| FullText URL | cted_012_033.pdf |
| Author | Yamakawa, Junji| Takahata, Hiroshi| |
| Abstract | 岡山大学でリアルタイムオンライン講義を実施した。使用したオンラインシステムはYouTubeLiveとGoogleClassroomのWebアプリケーションを使用して作成者が新たに構築した。このシステムは，講義ビデオアーカイブを提供することも可能であった。システムの構築費と運用費はかなり低くなる可能性がある。LMSは，講義ビデオの配信に加えて，学生とのコミュニケーションを合理化するために用いた。ビデオ配信システムまたはLMSの障害が原因でオンライン講義が停止することはなかった。このシステムにより講師は講義室の設備や講義の時間割の制約から解放され，マルチメディア教材やバーチャル教材の使用が容易になった。また学生の受講効率は従来の講義形式に対して約2.9倍に向上したと考えられる。授業の構成や内容の質的問題の検証，授業内容に対する生徒の理解の深化，生徒が習得した資質や能力の内容の検証は今後の課題である。 |
| Keywords | オンライン講義(Online Lecture) OBS Studio YouTube Live Google Classroom 受講効率(Attendance efficiency) |
| Publication Title | Bulletin of Center for Teacher Education and Development, Okayama University |
| Published Date | 2022-03-30 |
| Volume | volume12 |
| Start Page | 33 |
| End Page | 46 |
| ISSN | 2186-1323 |
| language | Japanese |
| Copyright Holders | Copyright © 2022 岡山大学教師教育開発センター |
| File Version | publisher |
| JaLCDOI | 10.18926/CTED/56536 |
|---|---|
| Title Alternative | Google classroom and Chromebook as an Educational IT system |
| FullText URL | cted_009_001_012.pdf |
| Author | Yamakawa, uni| |
| Abstract | 「2030年代を生きる力」と「働き方改革に利するITスキル」を教育するためのアクティブ・ラーニングをサポートする教育ITシステムの構築においてGoogle classroomとChromebookを検討した。教育クラウドプラットフォームのひとつであるClassroomと，Webアプリケーションを利用するChromebookを用いて教育ITシステムを構築すると低コストで導入と運用ができると考えられた。またこの教育ITシステムはGoogleアカウントを経由して作業環境やデータ・ファイルをスマートフォンとPCの間で同期するため，スマホ・ネイティブ世代の情報処理能力をスムースに拡張することができる。これにより国際化が要請されているスマホ・ネイティブ世代が経験するデジタル・デバイドを軽減し，また2030年代に向けて我が国のビジネス・ワーカーが持つITスキルを向上させることが期待される。 |
| Keywords | アクティブ・ラーニング 教育ITシステム Google classroom Chromebook スマホ・ ネイティブ世代 |
| Publication Title | Bulletin of Center for Teacher Education and Development, Okayama University |
| Published Date | 2019-03-20 |
| Volume | volume9 |
| Start Page | 1 |
| End Page | 12 |
| ISSN | 2186-1323 |
| language | Japanese |
| Copyright Holders | Copyright © 2019 岡山大学教師教育開発センター |
| File Version | publisher |
| JaLCDOI | 10.18926/ESR/53192 |
|---|---|
| Title Alternative | A high precision and high resolution estimation of the spatial distribution of PM2.5 in the south area of Okayama prefecture, Japan |
| FullText URL | esr_021_1_001_005.pdf |
| Author | Omori, Akiho| Yamakawa, Junji| |
| Abstract | A relatively high precision and high resolution spatial distribution of the PM2.5 in the south part of the Okayama prefecture, Japan was estimated by the Universal Kriging method and the FOSS4G GIS softwares. The observation data of the PM2.5 were obtained from the Environmental data service site of the Okayama prefecture. The geospatial open data about the research field that used in the research were served by the government research institutes. The spatial analysis were executed by the R (R core team, 2014) and its spatial libraries, maptools (Bivand and Lewin-Koh, 2014), rgdal (Bivand, Keitt and Rowlingson, 2014) and gstat (Pebesma, 2014). The geospatial representation and qualitative analysis of the estimated distribution were performed by the QGIS (QGIS Development Team, 2014) and the Google earth (Google, 2014). The time variant of the PM2.5 concentration by the each observatories in the area were show some cross correlation factor to the SPM10 concentration data. The estimated PM2.5 distribution seems to show that the relatively tight relation to the geospatial factors in the research area. The estimation of a time variant change of the PM2.5 distribution will be required of the further research.. |
| Keywords | PM2.5 Spatial statistics Kriging R-language gstat FOSS4G Google earth |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2014-12-27 |
| Volume | volume21 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 5 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2014 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120005567871 |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-12-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue12 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-11-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue11 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-10-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue10 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-09-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue9 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-08-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue8 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-07-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue7 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-06-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue6 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-05-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue5 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-04-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue4 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-03-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue3 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-02-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue2 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2011-01-01 |
| Publication Title | 化学 |
| Volume | volume66 |
| Issue | issue1 |
| Content Type | Article |
| Author | 山川 純次| |
|---|---|
| Published Date | 2012-03-01 |
| Publication Title | 化学 |
| Volume | volume67 |
| Issue | issue3 |
| Content Type | Article |
| JaLCDOI | 10.18926/CTED/49484 |
|---|---|
| Title Alternative | The Web-based Interactive three-dimensional Crystal Structure Materials for Scientific Education |
| FullText URL | cted_003_027_031.pdf |
| Author | Yamakawa, Junji| |
| Abstract | 理科教育におけるWeb ベースの対話型3 次元結晶構造教材としてX3D 形式あるいは3D PDF を使ったシステムを比較検討した。どちらの形式もe- ラーニングシステムと高い親和性を持ち，また初学者と専門家の空間概念の把握に関するギャップを埋める教材として優れていると考えられた。データの継続使用を考えた場合，オープン規格であるX3D 形式と対応Web ブラウザを用いるシステムが適していた。一方，高品位な印刷が必要な場合は3D PDF とAdobe Reader を組み合わせたシステムが適していると考えられたが，将来に渡る継続利用を考慮した場合，このシステムはプロプライエタリである点に留意して運用しなくてはならないだろう。 |
| Keywords | 3D PDF X3D 結晶構造 理科教材 |
| Publication Title | 岡山大学教師教育開発センター紀要 |
| Published Date | 2013-03-08 |
| Volume | volume3 |
| Start Page | 27 |
| End Page | 31 |
| ISSN | 2186-1323 |
| language | Japanese |
| Copyright Holders | Copyright © 2013 岡山大学教師教育開発センター |
| File Version | publisher |
| NAID | 120005232445 |
| JaLCDOI | 10.18926/ESR/49210 |
|---|---|
| Title Alternative | Estimation of SPM concentration distribution over the central Seto Inland Sea |
| FullText URL | esr_019_1_019_024.pdf |
| Author | Ebi, Takahiro| Matsumoto, Hirofumi| Yamakawa, Junji| |
| Abstract | Ordinary Kriging, OK, and Regression Kriging, RK, are the spatial statistical methods that are possible to estimate a horizontal distribution in a study area from discrete data. OK is the method which takes account of only spatial auto-correlation structure of the data, while RK is the method which takes account of an interrelationship between spatial auto-correlation structure and some auxiliary variables to minimize the estimation error. Analytical processing for OK and RK methods was performed by the R-Language (R Core Team, 2012) and its some additional libraries. The auxiliary variables required to perform RK method were prepared by a GIS application, Quantum GIS (Quantum GIS Development Team, 2012). The 3-dimensional geographic representation of the estimation maps was performed by the Google Earth (Google, 2012). In this report, OK and RK methods were applied to one of the Earth scientific information, SPM (Supended Particulate Matter). Then, these methods were considered by comparing two estimation maps, and finally considered qualitatively by displaying these maps in the Google Earth. |
| Keywords | Ordinary Kriging Regression Kriging Auxiliary variable R-Language Google Earth |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2012-12-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 19 |
| End Page | 24 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120005232328 |
| JaLCDOI | 10.18926/ESR/49209 |
|---|---|
| Title Alternative | The temperature and pressure conditions of synthetic Sibirskite and Parasibirskite |
| FullText URL | esr_019_1_013_017.pdf |
| Author | Kano, Masahiro| Yamakawa, Junji| |
| Abstract | Sibirskite (CaHBO ) and parasibirskite ₃ are in the relation of polymorphism, these are regarded as the alteration products of takedaite (Ca₃B₂O₆), occurs at Fuka mine, Okayama Prefecture. The synthesis of parasibirskite was reported by the Schäfer (1968a, b) etc. and the synthesis of sibirskite was reported by the Sun et al. (2011). To determine the formation condition of sibirskite and parasibirskite in the natural, they were synthesized from the natural takedaite (Ca₃B₂O₆). As a result, both of sibirskite and parasibirskite were formed by the duration time of 7 days with 1000 kg/cm2 and 300 oC, on the other hand, only sibirskite was formed by the duration time of 14 days with the same condition. In addition, the mixtures of sibirskite and parasibirskite were examined under the various temperatures and pressures of hydrothermal conditions. As a result, the upper limit of the stable temperature and pressure conditions of sibirskite was estimated between 350 oC and 400 oC at 1500 kg/cm2, and between 400 oC and 450 oC at 500 kg/cm2 . In the higher temperature than the condition, sibirskite were changed into shimazakiite (Ca₂B₂O₅). |
| Keywords | Sibirskite Parasibirskite Shimazakiite Fuka Hydrothermal synthesis |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2012-12-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 13 |
| End Page | 17 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved |
| File Version | publisher |
| NAID | 120005232327 |
