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  • 1
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    Chapter Early Detection and Reconstruction of Abnormal Data Using Hybrid VAE-LSTM Framework (2024)
    Firenze University Press
    Details
    Publication Date: 2024-04-04
    Description: Early failure detection and abnormal data reconstruction in sensor data provided by building ventilation control systems are critical for public health. Early detection of abnormal data can help prevent failures in crucial components of ventilation systems, which can result in a variety of issues, from energy wastage to catastrophic outcomes. However, conventional fault detection models ignore valuable features of dynamic fluctuations in indoor air quality (IAQ) measurements and early warning signals of faulty sensor data. This study introduces a hybrid framework for early failure detection and abnormal data reconstruction applying variance analysis and variational autoencoders (VAE) coupled with the long short-term memory network (VAE-LSTM). The periodicity and stable fluctuation of IAQ data are exploited by variance analysis to detect unusual variations before failure occurs. The IAQ dataset which is corrupted by introducing complete failure, bias failure and precision degradation fault is then used to verify the feasibility of the VAE-LSTM model. The results of variance analysis reveal that unusual behavior of the data can be detected as early as 12 hours before failure occurs. The reconstruction performance of the developed method is shown to be superior to other methods under different abnormal data scenarios
    Keywords: Early failure detection ; Abnormal data reconstruction ; Variational autoencoder (VAE) ; Long short-term memory network (LSTM) ; Sustainable IAQ management ; thema EDItEUR::U Computing and Information Technology
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Silver Nanoparticles, Cages and Flowers Growing on Carbon Nanosheets (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 5-8 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.5.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Gelation Behavior, Morphology, Thermal and Viscoelastic Properties of Epoxy-Cyanate Ester/Polyhedral Oligomeric Silsesquioxane (POSS) Nanocomposites (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 323-326 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Epoxy-cyanate (EP-CE) ester composites containing the inorganic-organic hybridpolyhedral oligomeric silsesquioxane (POSS) octaisobutyl(T8)-POSS (oib-POSS) were prepared.These EP-CE/POSS composites were characterized by gelation characteristics, transmissionelection microscopy (TEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC),thermal gravimetric analyses (TGA) and dynamic mechanical analysis (DMTA). The glasstransition temperature (Tg) and thermal decomposition temperature (Tdec) of composites increasedcompared with the neat epoxy-cyanate ester with the increment of POSS content. Additionally, allthe EP-CE/POSS composites exhibited higher storage modulus (E’) values (temperature〉Tg) thanthe pure resins. The loss factor peak intensities decreased as the weight percentage of POSSincreases. TEM and XRD showed that phase-separated aggregates of POSS were found in matrix,because POSS did not react with the resin
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.323.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Spurious Inference in the GARCH (1,1) Model When It Is Weakly Identified (2007)
    Cambridge, Mass. : Berkeley Electronic Press (now: De Gruyter)
    Studies in nonlinear dynamics and econometrics 11.2007, 1, art1 
    Details
    ISSN: 1081-1826
    Source: Berkeley Electronic Press Academic Journals
    Topics: Mathematics , Economics
    Notes: This paper shows that the Zero-Information-Limit-Condition (ZILC) formulated by Nelson and Startz (2006) holds in the GARCH (1,1) model. As a result, the GARCH estimate tends to have too small a standard error relative to the true one when the ARCH parameter is small, even when sample size becomes very large. In combination with an upward bias in the GARCH estimate, the small standard error will often lead to the spurious inference that volatility is highly persistent when it is not. We develop an empirical strategy to deal with this issue and show how it applies to real datasets.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/snde/vol11/iss1/art1
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  • 5
    Electronic Resource
    Electronic Resource
    Generating yeast transcriptional activators containing no yeast protein sequences (1991)
    [s.l.] : Nature Publishing Group
    Nature 350 (1991), S. 250-252 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We suggest that the relevant difference between LexA( 1-202) and LexA(l-87) is that the former, like GAL4(1-147) (ref. 4), efficiently forms dimers-the DNA-binding species-but the latter does not5. It is also possible that the carboxyl domain of LexA helps to stabilize the proteins in yeast. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/350250a0
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  • 6
    Electronic Resource
    Electronic Resource
    GAL4-VP16 is an unusually potent transcriptional activator (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 563-564 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 CAT activity resulting from activation of transcription by GAL4 derivatives, a, The reporter gene used in these experiments has the MMTV-LTR fused to the bacterial chloramphenicol acetyl transferase (CAT) gene. A 365-base-pair (bp) fragment from yeast UAS0 was cloned into the Xbal, Sad, or ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335563a0
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  • 7
    Electronic Resource
    Electronic Resource
    Benchmarking culture and performance in Chinese organizations (2005)
    Bingley : Emerald
    Benchmarking 12 (2005), S. 260-274 
    Details
    ISSN: 1463-5771
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: Purpose - To show differences in organizational performance, management style and systems, resulting from cultural differences in three organizational types: foreign-owned, joint ventures, and Chinese-owned and operated. Design/methodology/approach - A survey method was used to assess the management systems, leadership and styles within the cultural contexts of the three types of organizations using Hofstede's four cultural dimensions. Organizational performance was measured using balanced scorecard method and factors suggested by other authors. Performance measures were compared across the three types of organizations. Findings - Foreign-owned and operated companies performed significantly better than their joint venture (JV) and Chinese-owned and operated organizations as measured by financial perspective, customer perspective, internal business perspective, innovation and learning perspective and technological assessment. There was clear evidence of benchmarking among Chinese-owned and operated organizations, learning from JVs and FOOs. Research limitations/implications - This study used only managers who had a minimum of five years' experience. The study also did not entertain cross-breeding management styles. Practical implications - Provides useful information about benchmarking patterns being used by Chinese owned and operated organizations. As the blending of cultures in global organizations continues, learning organizations benchmark not only process technologies but also management systems, leadership and styles. Originality/value - The paper clearly provides a direct comparison among the three types of organizations operating in the Chinese cultural context. The methodology used is a blend of different approaches to ensure comprehensive assessment of organizational culture and performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/14635770510600375
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  • 8
    Electronic Resource
    Electronic Resource
    A Microscopic Mechanics Model for Thermal Fatigue Crack Growth (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 274-276 (Oct. 2004), p. 205-210 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.274-276.205.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    An HMG-like protein that can switch a transcriptional activator to a repressor (1994)
    [s.l.] : Nature Publishing Group
    Nature 371 (1994), S. 175-179 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To isolate Drosophila complementary DNAs encoding inhibi-tors of Dorsal, we used the yeast system shown in Fig. la. We assumed that the Ventral repression element10 (VRE) from the Drosophila zen promoter contains binding sites (shown in black) for one or more proteins that inhibit activation by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/371175a0
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  • 10
    Electronic Resource
    Electronic Resource
    Yeast activators stimulate plant gene expression (1988)
    [s.l.] : Nature Publishing Group
    Nature 334 (1988), S. 631-633 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Figure 1 shows the three types of DNA constructs used in this study. The first type, the 'effector', expresses various GAL4 derivatives from the nopaline synthase (NOS) promoter15. These derivatives include: GAL4(1-147), the ammo terminal portion of the 881-amino-acid GAL4 protein, which binds DNA ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/334631a0
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