title: Exploiting propositionalization based on random relational rules for semi-supervised learning

authors: Pfahringer, Bernhard

subjects: computer science

abstract: In this paper we investigate an approach to semi-supervised learning based on randomized propositionalization, which allows for applying standard propositional classification algorithms like support vector machines to multi-relational data. Randomization based on random relational rules can work both with and without a class attribute and can therefore be applied simultaneously to both the labeled and the unlabeled portion of the data present in semi-supervised learning. 
An empirical investigation compares semi-supervised propositionalization to standard propositionalization using just the labeled data portion, as well as to a variant that also just uses the labeled data portion but includes the label information in an attempt to improve the resulting propositionalization. Preliminary experimental results indicate that propositionalization generated on the full dataset, i.e. the semi- supervised approach, tends to outperform the other two more standard approaches.

text: Exploiting propositionalization based on random relational rules for semi-supervised learning In this paper we investigate an approach to semi-supervised learning based on randomized propositionalization, which allows for applying standard propositional classification algorithms like support vector machines to multi-relational data. Randomization based on random relational rules can work both with and without a class attribute and can therefore be applied simultaneously to both the labeled and the unlabeled portion of the data present in semi-supervised learning. 
An empirical investigation compares semi-supervised propositionalization to standard propositionalization using just the labeled data portion, as well as to a variant that also just uses the labeled data portion but includes the label information in an attempt to improve the resulting propositionalization. Preliminary experimental results indicate that propositionalization generated on the full dataset, i.e. the semi- supervised approach, tends to outperform the other two more standard approaches.

year: 2008

title: An electron-deficient triosmium cluster containing the thianthrene ligand: Synthesis, structure and reactivity of [Os₃(CO)₉(μ3-η2-C₁₂H₇S₂)(μ-H)]

authors: Raha, Arun K.

subjects: triosmium cluster

abstract: Reaction of [Os₃(CO)₁₀(CH₃CN)₂] with thianthrene at 80 °C leads to the nonacarbonyl dihydride compound [Os₃(CO)₉(μ-3,4-η²-C₁₂H₆S₂)(μ-H)₂] (1) and the 46-electron monohydride compound [Os₃(CO)₉(μ₃-η²-C₁₂H₇S₂)(μ-H)] (2). Compound 2 reacts reversibly with CO to give the CO adduct [Os₃(CO)₁₀(μ-η²-C₁₂H₇S₂)(μ-H)] (3) whereas with PPh₃ it gives the addition product [Os₃(CO)₉)(PPh₃)(μ-η²-C₁₂H₇S₂)(μ-H)] (4) as well as the substitution product 1,2-[Os₃(CO)₁₀ ((PPh₃)₂] (5) Compound 2 represents a unique example of an electron-deficient triosmium cluster in which the thianthrene ring is bound to cluster by coordination of the sulfur lone pair and a three-center-two-electron bond with the C(2) carbon which bridges the same edge of the triangle as the hydride. Electrochemical and DFT studies which elucidate the electronic properties of 2 are reported.

text: An electron-deficient triosmium cluster containing the thianthrene ligand: Synthesis, structure and reactivity of [Os₃(CO)₉(μ3-η2-C₁₂H₇S₂)(μ-H)] Reaction of [Os₃(CO)₁₀(CH₃CN)₂] with thianthrene at 80 °C leads to the nonacarbonyl dihydride compound [Os₃(CO)₉(μ-3,4-η²-C₁₂H₆S₂)(μ-H)₂] (1) and the 46-electron monohydride compound [Os₃(CO)₉(μ₃-η²-C₁₂H₇S₂)(μ-H)] (2). Compound 2 reacts reversibly with CO to give the CO adduct [Os₃(CO)₁₀(μ-η²-C₁₂H₇S₂)(μ-H)] (3) whereas with PPh₃ it gives the addition product [Os₃(CO)₉)(PPh₃)(μ-η²-C₁₂H₇S₂)(μ-H)] (4) as well as the substitution product 1,2-[Os₃(CO)₁₀ ((PPh₃)₂] (5) Compound 2 represents a unique example of an electron-deficient triosmium cluster in which the thianthrene ring is bound to cluster by coordination of the sulfur lone pair and a three-center-two-electron bond with the C(2) carbon which bridges the same edge of the triangle as the hydride. Electrochemical and DFT studies which elucidate the electronic properties of 2 are reported.

year: 2008

title: Te whanau o te maungarongo hikoi: Maori practice in motion (3 July 2006 to 9 July 2006)

authors: Gilgen, Maynard

subjects: Maori

abstract: What you are about to read is, in the main, a narrative. This narrative is designed to do two things. On one level it simply provides an explanation of how Puti and John Snowden used the funding received for this project. This document is therefore a demonstration of their accountability for the monies received. On another, far deeper, level this document operates to demonstrate to the reader the real power of the traditional concepts of whanaungatanga, whakapapa, tikanga, wairua, and manaakitanga. The adults, youths and elders who embarked on this journey had experiences that are not easily explained in written form. This document must try to achieve this task, and only a narrative that attempts to show these traditional concepts in action can do it.

text: Te whanau o te maungarongo hikoi: Maori practice in motion (3 July 2006 to 9 July 2006) What you are about to read is, in the main, a narrative. This narrative is designed to do two things. On one level it simply provides an explanation of how Puti and John Snowden used the funding received for this project. This document is therefore a demonstration of their accountability for the monies received. On another, far deeper, level this document operates to demonstrate to the reader the real power of the traditional concepts of whanaungatanga, whakapapa, tikanga, wairua, and manaakitanga. The adults, youths and elders who embarked on this journey had experiences that are not easily explained in written form. This document must try to achieve this task, and only a narrative that attempts to show these traditional concepts in action can do it.

year: 2008