702 research outputs found
Reducing wind noise in seismic data using non-negative matrix factorization: An application to Villarrica volcano, Chile
No full textSingle channel source separation of seismic signals is an appealing but difficult problem. In this paper, we introduce a semi-blind single-channel seismic source separation method to enhance the components of volcanic origin. In this method, the source decomposition scheme is addressed as a Sparse Non-negative Matrix Factorization (NMF) of the time-frequency representation of the single vertical seismic channel. As a case study we present an application using seismic data recorded at Villarrica volcano, Chile, one of the most active in the southern Andes. The analysed dataset is strongly contaminated by wind noise and the procedure is used to separate a component of volcanic origin from another of meteorological origin
Financial Sector Development in the Pacific Rim, East Asia Seminar on Economics, Volume 18
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Can ChatGPT Be Considered an Author of a Medical Article?
No full textKazuki Ide, Philip Hawke, Takeo Nakayama, Can ChatGPT Be Considered an Author of a Medical Article?, Journal of Epidemiology, 2023, Volume 33, Issue 7, Pages 381-382, Released on J-STAGE July 05, 2023, Advance online publication April 08, 2023, Online ISSN 1349-9092, Print ISSN 0917-5040, https://doi.org/10.2188/jea.JE20230030, https://www.jstage.jst.go.jp/article/jea/33/7/33_JE20230030/_article/-char/e
THE SIGMOIDAL INVESTMENT FUNCTION
No full textBased on the investment theory of Abel and Eberly (1994), we develop an analytical model of adjustment costs, which produces a sigmoidal investment function. We also estimate the piecewise linear investment function, which includes as special cases linear models, models with one threshold, the original model of Abel and Eberly, which has two thresholds, and sigmoidal models. Empirical evidence clearly supports the sigmoidal model. The threshold estimate of Tobinfs q is 0.91. The investment ratio does not respond at value of Tobinfs q below 0.91, but begins to react sensitively as Tobinfs q passes 0.91.Tobinfs q, financial constraints, irreversibility of investment, unlisted, Japanese firms, piecewise linear function
Paepalanthus strictus Koern.
No full textPaepalanthus strictus Koern. in Martius & Eichler, Fl. Bras. 3(1): 319 (1863) ≡ Dupatya stricta (Koern.) Kuntze, Revis. Gen. Pl. 2: 746 (1891). Type: BRAZIL. Minas Gerais: “Crescenti in prov. Minarum”, s.d., Gardner 5258 (lectotype, here designated: B!, duplicates: G!, P!). Koernicke (1963) described Paepalanthus strictus based on two collections. The specimen Gardner 5258 in B is more complete and contains annotations by the author, thus is here designated as the lectotype.Published as part of Trovó, Marcelo & Sano, Paulo Takeo, 2010, Taxonomic survey of Paepalanthus section Diphyomene (Eriocaulaceae), pp. 49-55 in Phytotaxa 14 on page 54, DOI: 10.11646/phytotaxa.14.1.4, http://zenodo.org/record/477875
Dataset for "Seismic background level (SBL) growth can reveal slowly developing long-term eruption precursors"
No full text<p>Ichihara M, Ohminato T, Konstantinou KI, Yamakawa K, Watanabe A, Takeo M (2023) Seismic background level (SBL) growth can reveal slowly developing long-term eruption precursors. Scientific Report (revised)</p>
<p>Matlab fig files for Figures 1--6 and Figures in Supporting Information in the above manuscript.</p>
"The Myth of the Main Bank: Japan and Comparative Corporate Governance"
No full textIn this essay on Masahiko Aoki's recent study of Japanese corporate governance, we argue that he and others misdescribe Japan on several fundamental dimensions. First, Japanese firms and employees choose neither to arrange implicit life-time employment contracts nor to invest heavily in firm-specific skills. Instead, firms keep employees employed during economic downturns only because interventionist courts do not let them lay their employees off. Second, Japanese firms do not organize themselves into keiretsu corporate groups, do not exchange shares with other alleged group members, and do not necessarily use the money-center bank attributed to the group as their "main bank." Last, Japanese "main banks" neither agree in advance to rescue troubled debtors nor monitor firms on behalf of other creditors.
Periprosthetic acetabular bone loss using a constrained acetabular component
No full textThis is the author-created version of Springer, Ito, Hiroshi ; Matsuno, Takeo,Archives of Orthopaedic and Trauma Surgery, 124(2), 2004, 137-139. The original publication is available at www.springerlink.com.
authorWe describe two patients with a constrained acetabular component who required treatment for recurrent dislocation showing postoperative periprosthetic acetabular bone loss. These hips required revision surgery and demonstrated considerable bone loss caused by the migrated acetabular component. Impingement may have occurred with increased stress at the bone-prosthesis interface, and the sharp ends of screws with a metal shell may have gradually plowed up the acetabular bone. These failures illustrate the potential risk of using a constrained acetabular component
Ambulatory blood pressure patterns of normotensive and hypertensive subjects and the correlation between ambulatory blood pressure and the severity of hypertension
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