title: Adaptive text mining: Inferring structure from sequences

authors: Witten, Ian H.

subjects: computer science

abstract: Text mining is about inferring structure from sequences representing natural language text, and may be defined as the process of analyzing text to extract information that is useful for particular purposes. Although hand-crafted heuristics are a common practical approach for extracting information from text, a general, and generalizable, approach requires adaptive techniques. This paper studies the way in which the adaptive techniques used in text compression can be applied to text mining. It develops several examples: extraction of hierarchical phrase structures from text, identification of keyphrases in documents, locating proper names and quantities of interest in a piece of text, text categorization, word segmentation, acronym extraction, and structure recognition. We conclude that compression forms a sound unifying principle that allows many text mining problems to be tacked adaptively.

text: Adaptive text mining: Inferring structure from sequences Text mining is about inferring structure from sequences representing natural language text, and may be defined as the process of analyzing text to extract information that is useful for particular purposes. Although hand-crafted heuristics are a common practical approach for extracting information from text, a general, and generalizable, approach requires adaptive techniques. This paper studies the way in which the adaptive techniques used in text compression can be applied to text mining. It develops several examples: extraction of hierarchical phrase structures from text, identification of keyphrases in documents, locating proper names and quantities of interest in a piece of text, text categorization, word segmentation, acronym extraction, and structure recognition. We conclude that compression forms a sound unifying principle that allows many text mining problems to be tacked adaptively.

year: 2004

title: Extracting the MESA SR4000 Calibrations

authors: Charleston, Sean A.

subjects: Science & Technology

abstract: Time-of-flight range imaging cameras are capable of acquiring depth images of a scene. Some algorithms require these cameras to be run in `raw mode', where any calibrations from the off-the-shelf manufacturers are lost. The calibration of the MESA SR4000 is herein investigated, with an attempt to reconstruct the full calibration. Possession of the factory calibration enables calibrated data to be acquired and manipulated even in “raw mode.” This work is motivated by the problem of motion correction, in which the calibration must be separated into component parts to be applied at different stages in the algorithm. There are also other applications, in which multiple frequencies are required, such as multipath interference correction. The other frequencies can be calibrated in a similar way, using the factory calibration as a base. A novel technique for capturing the calibration data is described; a retro-reflector is used on a moving platform, which acts as a point source at a distance, resulting in planar waves on the sensor. A number of calibrations are retrieved from the camera, and are then modelled and compared to the factory calibration. When comparing the factory calibration to both the “raw mode” data, and the calibration described herein, a root mean squared error improvement of 51:3mm was seen, with a standard deviation improvement of 34:9mm. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

text: Extracting the MESA SR4000 Calibrations Time-of-flight range imaging cameras are capable of acquiring depth images of a scene. Some algorithms require these cameras to be run in `raw mode', where any calibrations from the off-the-shelf manufacturers are lost. The calibration of the MESA SR4000 is herein investigated, with an attempt to reconstruct the full calibration. Possession of the factory calibration enables calibrated data to be acquired and manipulated even in “raw mode.” This work is motivated by the problem of motion correction, in which the calibration must be separated into component parts to be applied at different stages in the algorithm. There are also other applications, in which multiple frequencies are required, such as multipath interference correction. The other frequencies can be calibrated in a similar way, using the factory calibration as a base. A novel technique for capturing the calibration data is described; a retro-reflector is used on a moving platform, which acts as a point source at a distance, resulting in planar waves on the sensor. A number of calibrations are retrieved from the camera, and are then modelled and compared to the factory calibration. When comparing the factory calibration to both the “raw mode” data, and the calibration described herein, a root mean squared error improvement of 51:3mm was seen, with a standard deviation improvement of 34:9mm. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

year: 2015

title: Kua takoto te maanuka: Te tiimatanga o teetahi Kura Kaupapa Maaori

authors: Douglas, Vianney Gaye

subjects: Kura Kaupapa Maori

abstract: There is a paucity of literature on the establishment of new schools, and more particularly, the establishment of Kura Kaupapa Maaori. In addition, there is even less literature concerning the experiences and perspectives of whaanau and hapuu within Kaupapa Maaori initiatives. 

This thesis, therefore, illustrates the experience of a whaanau in the establishment of their Kura Kaupapa Maaori. The assertion within this thesis is that there are unique issues and challenges that Maaori communities encounter when pursuing the establishment of a Kura Kaupapa Maaori. Furthermore, a key factor in the success of establishing and sustaining the school is in the leadership.

Thus, the cognisance of Kaupapa Maaori and the development of Kura Kaupapa Maaori are explored. In addition, the key characteristics, roles and responsibilities of Maaori leadership both within the wider community and within schools are explored.

This case study included an interview with the Principal, and several focus group interviews with parents, staff and students of the new Kura Kaupapa who were involved with the school’s establishment during its first three years. In 2013, in its eleventh year, the school was identified as one of the top five successful Kura Kaupapa Maaori. 

The findings of this research will assist whaanau and leaders within schools to develop an understanding and appreciation of five key issues and challenges that a new school may face, and avenues that may take to address these.

text: Kua takoto te maanuka: Te tiimatanga o teetahi Kura Kaupapa Maaori There is a paucity of literature on the establishment of new schools, and more particularly, the establishment of Kura Kaupapa Maaori. In addition, there is even less literature concerning the experiences and perspectives of whaanau and hapuu within Kaupapa Maaori initiatives. 

This thesis, therefore, illustrates the experience of a whaanau in the establishment of their Kura Kaupapa Maaori. The assertion within this thesis is that there are unique issues and challenges that Maaori communities encounter when pursuing the establishment of a Kura Kaupapa Maaori. Furthermore, a key factor in the success of establishing and sustaining the school is in the leadership.

Thus, the cognisance of Kaupapa Maaori and the development of Kura Kaupapa Maaori are explored. In addition, the key characteristics, roles and responsibilities of Maaori leadership both within the wider community and within schools are explored.

This case study included an interview with the Principal, and several focus group interviews with parents, staff and students of the new Kura Kaupapa who were involved with the school’s establishment during its first three years. In 2013, in its eleventh year, the school was identified as one of the top five successful Kura Kaupapa Maaori. 

The findings of this research will assist whaanau and leaders within schools to develop an understanding and appreciation of five key issues and challenges that a new school may face, and avenues that may take to address these.

year: 2014