岡山大学教師教育開発センターActa Medica Okayama2186-1323132023受講効率と講義効率から見たオンライン講義―最適なオンライン講義時間の推定の試み―16ENJunjiYamakawa10.18926/CTED/65060 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。No potential conflict of interest relevant to this article was reported.岡山大学教師教育開発センターActa Medica Okayama2186-1323122022リアルタイムオンライン講義の受講効率の検証と課題 ―YouTube Live + OBS Studio とGoogle Classroom の活用―3346ENJunjiYamakawaAcademic Field of Natural Science a nd Technology, Okayama UniversityHiroshiTakahataCenter for Teacher Education and Development, Okayama University10.18926/CTED/63296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。No potential conflict of interest relevant to this article was reported.岡山大学教師教育開発センターActa Medica Okayama2186-132392019教育ITシステムとしてのGoogle classroomとChromebook112ENuniYamakawa10.18926/CTED/56536 「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。No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-74142112014岡山県南部におけるPM2.5の高精度高解像度空間分布推定15ENAkihoOmoriJunjiYamakawa10.18926/ESR/53192 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..No potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-196466122011ある鉱物学者の誕生石図鑑K トルコ石3434ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-196466112011ある鉱物学者の誕生石図鑑J トパーズ5151ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-196466102011ある鉱物学者の誕生石図鑑I トルマリン4343ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-19646692011ある鉱物学者の誕生石図鑑H サファイア4343ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-19646682011ある鉱物学者の誕生石図鑑G ペリドット4747ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-19646672011ある鉱物学者の誕生石図鑑F ルビー5151ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-19646662011ある鉱物学者の誕生石図鑑E ムーンストーン5151ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-19646652011ある鉱物学者の誕生石図鑑D ヒスイ5151ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-19646642011ある鉱物学者の誕生石図鑑C ダイヤモンド4343ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-19646632011ある鉱物学者の誕生石図鑑B アクアマリン4747ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-19646622011ある鉱物学者の誕生石図鑑A アメジスト3535ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-19646612011ある鉱物学者の誕生石図鑑@ ザクロ石4646ENNo potential conflict of interest relevant to this article was reported.化学同人Acta Medica Okayama0451-19646732012宝石にまつわる化学的加工技術 ―偽物に騙されないための知識と心得2428ENNo potential conflict of interest relevant to this article was reported.岡山大学教師教育開発センターActa Medica Okayama2186-132332013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2731ENJunjiYamakawa10.18926/CTED/49484 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。No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-74141912012瀬戸内海中部上空におけるSPM濃度分布の推定1924ENTakahiroEbiHirofumiMatsumotoJunjiYamakawa10.18926/ESR/49210Ordinary 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.No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-74141912012シベリア石とパラシベリア石の安定温度圧力条件1317ENMasahiroKanoJunjiYamakawa10.18926/ESR/49209Sibirskite (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).No potential conflict of interest relevant to this article was reported.岡山大学教師教育開発センターActa Medica Okayama2186-132322012岡山大学理学部におけるe-ラーニングシステムの導入と運用120125ENJunjiYamakawaTsugioShibata10.18926/CTED/48200岡山大学理学部ではe-ラーニングシステム(理学部LMS)が導入され運用されている。理学部LMSの導入に際しては商用またはオープンソフトウェアの様々な学習管理システムを調査し，Moodleが採用された。理学部でのMoodleはセキュアで信頼性の高いPCベースのGNU/Linux，Apache，MySQLおよびPHPが稼動するコンピュータによって運用されている。理学部LMSを使用するための初期コストは，学部を構成している教員と学生の持つ利用能力に応じて可能な限りコストパフォーマンスを高める様にデザインされた。LMSとして採用したMoodleがベースとしている社会構築主義は講義を改善する強力なポテンシャルを有するが，理学部LMSシステムの有効性はユーザの能力によって制限されるかもしれない。No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-74141812011KED法を用いた地球科学情報の分布推定13ENJunjiYamakawaTakahiroEbiHirofumiMatsumoto10.18926/ESR/47746KED, the Kriging with External Drift, is one of the spatial statistical method for estimating some distribution from the discrete spatial sampled data set about the research field. The KED uses the kriging method (Matheron, 1973) with some auxiliary map to minimize the estimated error. The KED procedure was performed by the R-Language (Ihaka and Gentleman, 1996) using some geostatistical libraries. The auxiliary maps required by the KED were prepared by the authors with some GIS applications. The 3-dimensional geographic representations for the estimated distribution were performed by the Google Earth (Google, 2011). In this report, the KED was applied to some Earth scientific information to show the fundamental scheme of the method.No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-74141712010Google(TM) Earthによる地球科学情報の表示2526ENJunjiYamakawaTakahiroEbiHirofumiMatsumoto10.18926/ESR/42460The Google(TM) Earth is a GIS application provided by the Google, with versatile and high performance visualization and manipulation capability for geographic information. The Google Earth is also a multi-platform application, so the installation and running cost for research and education site is relatively low. The Earth
scientific information also have a geographic information scheme, so the Google Earth has some potential to support the education and research field of the Earth science. In this report, some Earth scientific information were converted by the R-Language and its libraries for represent by the Google Earth. The 3-dimensional representation of the information will be able to support to understanding the specification of the data for the Earth scientific research and education field.No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-74141712010DGEM: 数値地質標高モデル2123ENJunjiYamakawaTakahiroEbiHirofumiMatsumoto10.18926/ESR/42459DGEM, a Digital Geological Elevation Model, was developed using the digital geological map and the JPGIS DEM data with some GIS application and the R-Language. In the model, the information of the geological map was combined with the DEM by their coordinates. The integration of those two digital map was performed by the R-Language, so the model can be used by some useful presentation library of the language, such as the RGL, or
by some geographical calculation libraries. Moreover, the DGEM will be used by the spatial statistical libraries of the R-Language to investigate some geological spatial distributed specifications.No potential conflict of interest relevant to this article was reported.Acta Medica Okayama2000Native gold from Mikawa mine, Niigata Prefecture, JapanENJunjiYamakawaMitsuoTanabeKazumasaShimadaChiyokoHenmi<p>Native gold was found at Mikawa mine, Niigata Prefecture, Japan. The mineral was associated with quartz in a druse within quartz-vein in propyrite. The crystals were formed in filiform, reticulated and dendritic shapes with about 1 mm length with 0.1 mm width and 0.05 mm thickness. Very malleable and ductile, opaque and yellow with metallic luster. Qualitative and semi-quantitative analyses were performed by the wavelength dispersive EPMA. Quantitatively, the crystals contained Au, Ag and Hg. Semi-quantitative analyses were executed with ZAF correction algorithm. The results showed that these specimens had a average chemical composition Au<sub>0.77</sub>Ag<sub>0.11</sub>Hg<sub>0.12</sub>. This specimen was archived at our site with a collection number ESO-M01001.</p>
No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-7414111994単結晶強度データーリスト作成プログラムLISTHKL4952ENJunjiYamakawaAkiraKawahara10.18926/ESR/13959LISTHKL, a Fortran 77 program listing up the data for deposit is submission to Acta Crystallo-graphica has been written. The program requires a computer set with a printer utilizung the LIPS3 page description language.No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-7414111994CALCOMPからLIPS3への変換ライブラリの作成3748ENJunjiYamakawa10.18926/ESR/13958CALLIP, a CALCOMP compatible Fortran 77 library using the Canon LIPS3 page description lan-guage, has been written. As a result, the graphic output of programs with CALCOMP plotting routines used for crystal structure analyses, such as ORTEP2, Rietveld analyses and others can be used under the printer equipped with LIPS3 PDL. The details of the library was given with some graphic examples.No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-7414211995X線発生装置真空度監視システムの試作 （8ビットパソコンの有効利用)103108ENJunjiYamakawaAkiraKawahara10.18926/ESR/13950An used 8 bit personal computer is utilized for an instrument for continuous monitoring of the vacuum valuses of X-ray genrators. The interface board, programmable peripheral interfacial LSI, 8255A and some IC's for address decoding are assembled into a completed unti. The concept of the construction of this interface unti is profitable for the inexpensive layout of experimental laboratories.No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-7414311996マイコンを使用した水熱合成炉徐冷制御装置の作成6570ENJunjiYamakawaAkiraKawahara10.18926/ESR/13937A used 8 bit microcomputer is applied for an instrument of controlling the heating temperatures of hydrothermal reactor furnaces. The temperatures were changed into appropriate values of voltage by thermocouples and additional devices. The interface board, programmable peripheral interface LSI and some IC's for addres decording are assembled into a complte unti. The device is useful for the inexpensive way of the construction of the accurate temperature control system.No potential conflict of interest relevant to this article was reported.岡山大学理学部地球科学教室Acta Medica Okayama1340-7414712000新潟県東蒲原郡三川村三川鉱山産の自然金1920ENJunjiYamakawaMitsuoTanabeKazumasaShimadaChiyokoHenmi10.18926/ESR/13894Native gold was found at Mikawa mine, Niigata Prefecture, Japan. The mineral was associated with quartz in a druse within quartz-vein in propyrite. The crystals were formed in filiform, reticulated and dendritic shapes with about 1 mm length with 0.1 mm width and 0.05 mm thickness. Very malleable and ductile, opaque and yellow with metallic luster. Qualitative and semi-quantiative analyses were performed by the wavelength dispersive EPMA. Quantitatively, the crystals contained Au, Ag and Hg. Semi-quantitative analyses were executed with ZAF correction algorithm. The results showed that these specimens had a average chemical composition Au0.77 Ag0.11Hg0.12. This specimen was archived at our site with a collection number ESO-M01001.No potential conflict of interest relevant to this article was reported.Acta Medica Okayama1994燐酸塩鉱物の結晶構造の生成条件への依存性―それに関連した構造の系統化の研究―ENNo potential conflict of interest relevant to this article was reported.