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See detailA hidden Markov model to predict early mastitis from test-day somatic cell scores
Detilleux, Johann ULiege

in Animal (2011), 5(2), 175-181

In many countries, high somatic cell scores (SCS) in milk are used as an indicator for mastitis because they are collected on a routine basis. However, individual test-day SCS are not very accurate in ... [more ▼]

In many countries, high somatic cell scores (SCS) in milk are used as an indicator for mastitis because they are collected on a routine basis. However, individual test-day SCS are not very accurate in identifying infected cows. Mathematical models may improve the accuracy of the biological marker by making better use of the information contained in the available data. Here, a simple hidden Markov model (HMM) is described mathematically and applied to SCS recorded monthly on cows with or without clinical mastitis to evaluate its accuracy in estimating parameters (mean, variance and transition probabilities) under healthy or diseased states. The SCS means were estimated at 1.96 (s.d.50.16) and 4.73 (s.d.50.71) for the hidden healthy and infected states, and the common variance at 0.83 (s.d.50.11). The probability of remaining uninfected, recovering from infection, getting newly infected and remaining infected between consecutive test days was estimated at 78.84%, 60.49%, 11.70% and 15%, respectively. Three different health-related states were compared: clinical stages observed by farmers, subclinical cases defined for somatic cell counts below or above 250 000 cells/ml and infected stages obtained from the HMM. The results showed that HMM identifies infected cows before the appearance of clinical and subclinical signs, which may critically improve the power of the studies on the genetic determinants of SCS and reduce biases in predicting breeding values for SCS. [less ▲]

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See detailHidden Markov Model-based population synthesis
Saadi, Ismaïl ULiege; El Saeid Mustafa, Ahmed Mohamed ULiege; Teller, Jacques ULiege et al

in Transportation Research. Part B : Methodological (2016), 90

Micro-simulation travel demand and land use models require a synthetic population, which consists of a set of agents characterized by demographic and socio-economic attributes. Two main families of ... [more ▼]

Micro-simulation travel demand and land use models require a synthetic population, which consists of a set of agents characterized by demographic and socio-economic attributes. Two main families of population synthesis techniques can be distinguished: (a) fitting methods (iterative proportional fitting, updating) and (b) combinatorial optimization methods. During the last few years, a third outperforming family of population synthesis procedures has emerged, i.e., Markov process-based methods such as Monte Carlo Markov Chain (MCMC) simulations. In this paper, an extended Hidden Markov Model (HMM)-based approach is presented, which can serve as a better alternative than the existing methods. The approach is characterized by a great flexibility and efficiency in terms of data preparation and model training. The HMM is able to reproduce the structural configuration of a given population from an unlimited number of micro-samples and a marginal distribution. Only one marginal distribution of the considered population can be used as a boundary condition to “guide” the synthesis of the whole population. Model training and testing are performed using the Survey on the Workforce of 2013 and the Belgian National Household Travel Survey of 2010. Results indicate that the HMM method captures the complete heterogeneity of the micro-data contrary to standard fitting approaches. The method provides accurate results as it is able to reproduce the marginal distributions and their corresponding multivariate joint distributions with an acceptable error rate (i.e., SRSME=0.54 for 6 synthesized attributes). Furthermore, the HMM outperforms IPF for small sample sizes, even though the amount of input data is less than that for IPF. Finally, simulations show that the HMM can merge information provided by multiple data sources to allow good population estimates. [less ▲]

Detailed reference viewed: 83 (6 ULiège)
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See detailThe Hidden Recess of a Global City: La République Marseille
Van Cauwenberge, Geneviève ULiege

Conference (2011, August 13)

Detailed reference viewed: 14 (2 ULiège)
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See detailThe hidden third: Improving outcome in treatment-resistant depression
Schlaepfer, TE; Agren, H; Monteleone, Patrick et al

in Journal of Psychopharmacology (2012)

Detailed reference viewed: 67 (0 ULiège)
See detailHide-working in the Late Palaeolithic site at Rekem (Belgium): confrontation with ethnoarchaelogical observations
Caspar, Jean-Paul; Beyries, Sylvie; De Bie, Marc et al

Conference (2000)

Detailed reference viewed: 61 (1 ULiège)
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See detailHiding for surviving? Quaternary evolutionary history of bryophytes in Europe
Desamore, Aurélie ULiege

Doctoral thesis (2013)

Detailed reference viewed: 44 (10 ULiège)
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See detailHiện trạng sử dụng và giá trị dinh dưỡng một số loại thức ăn xanh dùng nuôi lợn trong nông hộ ở miền Bắc Việt Nam
Tran, Hiep; Nguyen Van, Duy; Nguyen Cong, Oanh ULiege et al

in Journal of Animal Husbandry Science and Technics (JAHST) (2013), (8),

The study was conducted (2010 to 2011) to assess the current use and nutritive value of green forages commonly used for pig in Northern Vietnam. The current use of forages was surveyed in Hai Duong, Phu ... [more ▼]

The study was conducted (2010 to 2011) to assess the current use and nutritive value of green forages commonly used for pig in Northern Vietnam. The current use of forages was surveyed in Hai Duong, Phu Tho and Hoa Binh. Nutritive values were classified at laboratory of Animal Nutrition Department (University of Liège - Gembloux, Belgium). Results showed the most common forages were sweet potatoes (98.89%), taro (58.89%) and banana (64.45%). They were mostly used as fiber supplement; some were used for diarrhea and anti-constipation treatment or for increasing milk production. Nutritional value varied from 2.76% to 25.30% (CP); 10.17% to 44.27% (NDF); 3232.92 to 4225.75 Kcal (GE); and 3.69% to 20.00% (ash). In vitro digestibility ranged from 36.71% to 85.44% for DM; 45.18% to 92.55% for CP; and 38.71% to 73.43% for GE. In vitro digestibility of banana fruit was higher than banana stem and flower. In vitro digestibility of DM, CP and GE of green banana fruit were 44.04%, 70.36% and 44.90%, lower than semi-ripe(81.43%, 75.65% and 55.52%), and ripe banana (85.44%, 78.60% and 54.04%), respectively. With high protein content, banana flower, broussonetia papyrifera leaf, taros and cabbage can be used as a good feed of swine. [less ▲]

Detailed reference viewed: 57 (1 ULiège)
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See detailHier Dinaso! Les fascistes flamands et la guerre civile en espagne
Spinoy, Erik ULiege

Conference (2008, March 13)

This paper reconstructs the ambivalent attitude taken by the Flemish fascist movement Verdinaso towards the Spanish Civil War, through articles published in its weekly organ.

Detailed reference viewed: 52 (7 ULiège)
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See detailHier, da und dort - regionale Variation und standardsprachlicher Gebrauch bei den primären Lokaldeiktika im Deutschen
Möller, Robert ULiege

in Zeitschrift für Germanistische Linguistik (2011), 39(2011), 1-23

Detailed reference viewed: 77 (8 ULiège)
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See detailHierarchical aluminosilicate macrochannels with structured mesoporous walls: Towards a single catalyst for multistep reactions
Léonard, Alexandre ULiege; Su, B.-L.

in Colloids and Surfaces A : Physicochemical and Engineering Aspects (2007), 300(1-2 SPEC. ISS.), 129-135

Two novel and simple synthesis pathways, one surfactant-assisted and one template-free, have recently been developed for the formation of aluminosilicate macrochannels with mesoporous walls. These ... [more ▼]

Two novel and simple synthesis pathways, one surfactant-assisted and one template-free, have recently been developed for the formation of aluminosilicate macrochannels with mesoporous walls. These thermally stable materials are made of straight tubular macrochannels separated by wormhole-like mesopores. This paper gives a comparative study of the materials obtained by both ways in order to determine the role played by the surfactant. High specific surface area materials with homogeneous tubular macrochannels are spontaneously formed without needing any templating procedure. The use of a non-ionic surfactant favors the incorporation of Al atoms in tetrahedral sites and also controls the homogeneity of the mesopores. The formation of the macrochannels is believed to result from the spontaneous and strong release of alcohol molecules due to high hydrolysis and condensation rates of the inorganic sources, which creates a hydrodynamic flow, thus channels of the solvent. The mesopores are generated by interparticular voids. © 2006 Elsevier B.V. All rights reserved. [less ▲]

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See detailHierarchical Cluster Analysis of Environmental Pollutants through P450 Induction in Cultured Hepatic Cells
Dubois, Marilyn; Plaisance, H.; Thomé, Jean-Pierre ULiege et al

in Ecotoxicology & Environmental Safety (1996), 34(3), 205-15

Environmental pollutants are classically associated with increased drug metabolism. Cultures of rat hepatocytes, quail hepatocytes, and human hepatoma (Hep G2) cells were used to study the effects of ... [more ▼]

Environmental pollutants are classically associated with increased drug metabolism. Cultures of rat hepatocytes, quail hepatocytes, and human hepatoma (Hep G2) cells were used to study the effects of pesticides on drug-metabolizing enzymes. Membrane integrity and mitochondrial activity were evaluated and induction of ethoxycoumarin-O-deethylase and ethoxyresorufin-O-deethylase activities were measured. Induced P450s were identified by immunoblotting. Pentachlorophenol and lindane appeared as the strongest inducers. On the immunoblots, specific antibodies revealed induced CYP1A1 in fetal rat hepatocytes, CYP2B in quail hepatocytes, and CYP3A7 in Hep G2 cells. Pesticide effects on these different activities in each type of cultured cells were compared by cluster analysis. Results obtained under similar conditions with reference inducers phenobarbital (PB) and benzo[a]anthracene and other environmental pollutants (polychlorobiphenyls) were added to previous data prior to multivariate analysis. The tested products fell into four major groups: a first group with pentachlorophenol, identified as a CYP3A inducer; a second group containing the methylcholanthrene-type inducers that increase CYP1A-related activities; a third class represented by dieldrin, a PB-type inducer; a fourth group including inert compounds or weak inducers. Lindane shares the criteria of the second and third groups and seems to induce both CYP1A and CYP2B activities. The current study results highlight the advantage of using several types of cultured hepatocytes to evaluate the short-term toxicity of environmental pollutants in vitro and constitute a useful model for predicting the potential toxicity of pesticides in humans (Hep G2 cells) and wildlife (fetal quail hepatocytes). [less ▲]

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See detailHierarchical clustering of brain activity during human nonrapid eye movement sleep.
Boly, Mélanie ULiege; Perlbarg, V; Marrelec, G et al

in Proceedings of the National Academy of Sciences of the United States of America (2012)

Consciousness is reduced during nonrapid eye movement (NREM) sleep due to changes in brain function that are still poorly understood. Here, we tested the hypothesis that impaired consciousness during NREM ... [more ▼]

Consciousness is reduced during nonrapid eye movement (NREM) sleep due to changes in brain function that are still poorly understood. Here, we tested the hypothesis that impaired consciousness during NREM sleep is associated with an increased modularity of brain activity. Cerebral connectivity was quantified in resting-state functional magnetic resonance imaging times series acquired in 13 healthy volunteers during wakefulness and NREM sleep. The analysis revealed a modification of the hierarchical organization of large-scale networks into smaller independent modules during NREM sleep, independently from EEG markers of the slow oscillation. Such modifications in brain connectivity, possibly driven by sleep ultraslow oscillations, could hinder the brain's ability to integrate information and account for decreased consciousness during NREM sleep. [less ▲]

Detailed reference viewed: 59 (4 ULiège)
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See detailHierarchical macro-mesoporous oxides and carbons: towards new and more efficient hierarchical catalysis
Léonard, Alexandre ULiege; Vantomme, Aurélien; Su, Bao-Lian

in Cao, Guozhong; Brinker, Jeffrey C (Eds.) Annual Review of Nano Research-Volume 2 (2008)

Detailed reference viewed: 22 (2 ULiège)
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See detailHierarchical multimodal mesoporous carbon materials with parallel macrochannels
Su, Bao-Lian; Vantomme, Aurelien; Surahy, Lidwine et al

in Chemistry of Materials (2007), 19(13), 3325-3333

Hierarchically structured multimodal meso-macroporous carbon materials have been prepared by using the nanoreplication of the mesoporous walls of a meso-macroporous zirconia exotemplate. Like the zirconia ... [more ▼]

Hierarchically structured multimodal meso-macroporous carbon materials have been prepared by using the nanoreplication of the mesoporous walls of a meso-macroporous zirconia exotemplate. Like the zirconia exotemplate, the pure carbon material possesses funnel shaped straight macrochannels, parallel to each other and perpendicular to the tangent of the particles' dense mesoporous shell. As a result of the funnel-like shape, each macrochannel has a pore size gradient with a large opening centered at 300-700 nm. The walls of the macrochannels and the dense mesoporous shells are formed by a hierarchical mesostructured porous system with uniform mesopore sizes centered at 3, 15-17, and 25-50 nm. Macrochannels are interconnected with hierarchically mesostructured walls and shells. A high surface area of 950 m(2)/g with a mesopore volume of 0.44 cm(3)/g is obtained. The possibility of the nanoreplication of other meso-macroporous oxides such as aluminosilicates, titania, and niobium oxide with different macrochannel size, shape, and organization has also been studied to generate meso-macroporous carbon materials with different organizations of the macrochannels. [less ▲]

Detailed reference viewed: 115 (2 ULiège)
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See detailHierarchical Porous TiO2 thin films by soft and dual templating: A quantitative approach of specific surface and porosity
Henrist, Catherine ULiege; Cloots, Rudi ULiege; Colson, Pierre ULiege et al

Poster (2013, March)

Hierarchical porous structures, with different pore sizes, constitute an important field of research for many applications. However, increasing the pore size results in the decrease of specific surface ... [more ▼]

Hierarchical porous structures, with different pore sizes, constitute an important field of research for many applications. However, increasing the pore size results in the decrease of specific surface. There is a need to quantify and predict the resulting porosity and specific surface. We have prepared hierarchical porous TiO2 thin films either by surfactant templating (soft) or dual surfactant/microspheres templating (soft/hard). They all show narrow, bimodal distribution of pores. Soft templating route leads to very thin films showing high specific surface and bimodal porosity with diameters of 10 nm and 54 nm. Dual templating route combines a Pluronic surfactant-based precursor solution with polystyrene (PS) microspheres (diam. 250 nm) in a one-pot simple process. This gives thicker films with a bimodal distribution of pores (8 nm and 165-200 nm). The dye loading of hierarchical films is compared to pure Pluronic-templated TiO2 films and shows a relative decrease of 29% for Single Templating (ST) and 43% for Dual Templating (DT-250). Finally, a geometrical model is proposed and validated for each system, based on the agreement between calculated specific surfaces and experimental dye loading with N719 dye. [less ▲]

Detailed reference viewed: 73 (17 ULiège)
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See detailHierarchical state estimation
Pavella, Mania ULiege; Van Cutsem, Thierry ULiege; Horward, Jean-Luc ULiege et al

in International Journal of Electrical Power & Energy Systems (1980), 2

Detailed reference viewed: 24 (1 ULiège)