Opinion Mining

In this thesis we study the field of opinion mining by giving a comprehensive review of the available research that has been done in this topic. Also using this available knowledge we present a case study of a multilevel opinion mining system for a student organization's sales management system. We describe the field of opinion mining by discussing its historical roots, its motivations and applications as well as the different scientific approaches that have been used to solve this challenging problem of mining opinions. To deal with this huge subfield of natural language processing, we first give an abstraction of the problem of opinion mining and describe the theoretical frameworks that are available for dealing with appraisal language. Then we discuss the relation between opinion mining and computational linguistics which is a crucial pre-processing step for the accuracy of the subsequent steps of opinion mining. The second part of our thesis deals with the semantics of opinions where we describe the different ways used to collect lists of opinion words as well as the methods and techniques available for extracting knowledge from opinions present in unstructured textual data. In the part about collecting lists of opinion words we describe manual, semi manual and automatic ways to do so and give a review of the available lists that are used as gold standards in opinion mining research. For the methods and techniques of opinion mining we divide the task into three levels that are the document, sentence and feature level. The techniques that are presented in the document and sentence level are divided into supervised and unsupervised approaches that are used to determine the subjectivity and polarity of texts and sentences at these levels of analysis. At the feature level we give a description of the techniques available for finding the opinion targets, the polarity of the opinions about these opinion targets and the opinion holders. Also at the feature level we discuss the various ways to summarize and visualize the results of this level of analysis. In the third part of our thesis we present a case study of a sales management system that uses free form text and that can benefit from an opinion mining system. Using the knowledge gathered in the review of this field we provide a theoretical multi level opinion mining system (MLOM) that can perform most of the tasks needed from an opinion mining system. Based on the previous research we give some hints that many of the laborious market research tasks that are done by the sales force, which uses this sales management system, can improve their insight about their partners and by that increase the quality of their sales services and their overall results.

Challenges for virtual teams in voluntary organizations

This research concerns virtual teams in the field of volunteer work. The developments in the area of information and communication technology have decreased their costs and made them easily accessible. As a result, it seems natural that also the voluntary organizations have adopted online tools and virtual teams as a part of their work modes. However, virtual teams have not received much research in this context, and one of the goals of this study was to begin closing that gap. The research had two main focus areas: the challenges that the volunteers face in the teams, and the leadership that the teams have. The study used a qualitative approach and semi-structured interviews. The interviews were conducted over Skype and email and included members from six different teams. The case organization was a European-wide student organization that widely utilized virtual teams in its work. The study identified three critical issues for managing the virtual teams. The first challenge was creating common ground for teamwork through electronic communication. Secondly, volunteering created challenges for the teams through variations in the level of commitment of the members, as some left the organization during the term of the team. Lastly, knowledge transfer was a challenge that came from changing the team members regularly each year. As for the second key topic, leadership in the teams was spread among the team members unevenly. The teams had a formal leader, but they exhibited signs of shared leadership, and the team members were able to influence the team through their own level of involvement. Especially the experience that a member had contributed the amount of influence she held. All in all, the challenges that the volunteers faced were similar to those of normal virtual teams. Volunteering brought additional challenges through the varying levels of commitment and the changing of the team members. Additionally, the role of the team leader was not as firm. The results of the study can be applied to other volunteer organizations that utilize virtual teams.

Challenges for virtual teams in voluntary organizations

This research concerns virtual teams in the field of volunteer work. The developments in the area of information and communication technology have decreased their costs and made them easily accessible. As a result, it seems natural that also the voluntary organizations have adopted online tools and virtual teams as a part of their work modes. However, virtual teams have not received much research in this context, and one of the goals of this study was to begin closing that gap. The research had two main focus areas: the challenges that the volunteers face in the teams, and the leadership that the teams have. The study used a qualitative approach and semi-structured interviews. The interviews were conducted over Skype and email and included members from six different teams. The case organization was a European-wide student organization that widely utilized virtual teams in its work. The study identified three critical issues for managing the virtual teams. The first challenge was creating common ground for teamwork through electronic communication. Secondly, volunteering created challenges for the teams through variations in the level of commitment of the members, as some left the organization during the term of the team. Lastly, knowledge transfer was a challenge that came from changing the team members regularly each year. As for the second key topic, leadership in the teams was spread among the team members unevenly. The teams had a formal leader, but they exhibited signs of shared leadership, and the team members were able to influence the team through their own level of involvement. Especially the experience that a member had contributed the amount of influence she held. All in all, the challenges that the volunteers faced were similar to those of normal virtual teams. Volunteering brought additional challenges through the varying levels of commitment and the changing of the team members. Additionally, the role of the team leader was not as firm. The results of the study can be applied to other volunteer organizations that utilize virtual teams.

Higher education and national identity : Polish student activism in Russia 1832-1863

Doctoral dissertation, University of Helsinki

Determination of the critical activities of a public-private intermediary organization with the help of value chain analysis

Tämän diplomityön tavoitteena oli selvittää arvoketjuanalyysin avulla toiminnot, joilla voittoatavoittelemattoman, julkisen osakeyhtiön toimintaa voitaisiin kuvata. Tarkoituksena oli selvittää mainitut toiminnot yleisesti ja luoda malli kohdeyrityksen arvoketjusta ja sen toiminnoista. Tutkielma jakautuu teoreettiseen ja empiiriseen osaan. Ensimmäinen pohjautuu aikaisempaan tutkimukseen ja kirjallisuuteen sidosryhmistä, arvon muodostumisesta ja arvoketjuanalyysistä. Jälkimmäinen on laadullista tapaustutkimusta. Empiriassa mallinnettiin Lappeenranta Innovation Oy:nsisäisiä toimintoja ja sidosryhmien odotuksia. Empiirinen tutkimus perustui kohdeyrityksen omistajille ja henkilöstölle tehtyihin haastatteluihin sekä yrityksen toiminnan päivittäiseen seurantaan. Johtopäätöksenätodettiin, että julkisen, voittoa tavoittelemattoman yrityksen toiminnot on mahdollista kuvata arvoketjuanalyysin avulla. Alan ja yrityksen asettamat erityispiirteet toivat haasteita määrittelylle, mutta silti arvoketju antoi selkeän tavan kohdeyrityksen toimintojen mallintamiselle.