A Study of Privacy Preserving Queries with Bloom Filters

This thesis focuses on the private membership test (PMT) problem and presents three single server protocols to resolve this problem. In the presented solutions, a client can perform an inclusion test for some record x in a server's database, without revealing his record. Moreover after executing the protocols, the contents of server's database remain secret. In each of these solutions, a different cryptographic protocol is utilized to construct a privacy preserving variant of Bloom filter. The three suggested solutions are slightly different from each other, from privacy perspective and also from complexity point of view. Therefore, their use cases are different and it is impossible to choose one that is clearly the best between all three. We present the software developments of the three protocols by utilizing various pseudocodes. The performance of our implementation is measured based on a real case scenario. This thesis is a spin-off from the Academy of Finland research project "Cloud Security Services".

Reasoning over knowledge-based generation of situations in context spaces to reduce food waste

With the ever-growing amount of connected sensors (IoT), making sense of sensed data becomes even more important. Pervasive computing is a key enabler for sustainable solutions, prominent examples are smart energy systems and decision support systems. A key feature of pervasive systems is situation awareness which allows a system to thoroughly understand its environment. It is based on external interpretation of data and thus relies on expert knowledge. Due to the distinct nature of situations in different domains and applications, the development of situation aware applications remains a complex process. This thesis is concerned with a general framework for situation awareness which simplifies the development of applications. It is based on the Situation Theory Ontology to provide a foundation for situation modelling which allows knowledge reuse. Concepts of the Situation Theory are mapped to the Context Space Theory which is used for situation reasoning. Situation Spaces in the Context Space are automatically generated with the defined knowledge. For the acquisition of sensor data, the IoT standards O-MI/O-DF are integrated into the framework. These allow a peer-to-peer data exchange between data publisher and the proposed framework and thus a platform independent subscription to sensed data. The framework is then applied for a use case to reduce food waste. The use case validates the applicability of the framework and furthermore serves as a showcase for a pervasive system contributing to the sustainability goals. Leading institutions, e.g. the United Nations, stress the need for a more resource efficient society and acknowledge the capability of ICT systems. The use case scenario is based on a smart neighbourhood in which the system recommends the most efficient use of food items through situation awareness to reduce food waste at consumption stage.

B2B-palveluprosessin analyysi ja myyntikohtaamisen kehityskohteet uusasiakashankinnassa

Tämän opinnäytetyön tavoitteena on selvittää tekijöitä, jotka vaikuttavat myyntikohtaamisen onnistumiseen potentiaalisten yritysasiakkaiden keskuudessa. Käytännön ratkaisuihin pääsemiseksi opinnäytetyössä tarkastellaan case-yritystä, joka on suomalainen vakuutusyhtiö. Tutkimus keskittyy case-yrityksen palveluprosessin tarkasteluun, sekä käytännön myyntikohtaamisen analysoimiseen. Tutkimuksen avulla pyritään muodostamaan näkemys siitä, mitä myyntikohtaamisessa kannattaa kehittää, jotta uusasiakashankintaa voitaisiin yrityksen toimintona parantaa. Myyntikohtaamista ja laajempaa palveluprosessia tarkastellaan aluksi case-yrityksen toimintamallien kautta. Keskeisessä roolissa on asiakaslähtöisen toimintaperiaatteen selventäminen teoriassa ja sen vertaaminen case-yrityksen koko palveluprosessin toimintamalleihin. Tämän jälkeen siirrytään tarkastelemaan haastattelututkimuksen avulla kerättyä dataa case-yrityksen asiakkailta. Haastattelututkimuksen avulla selvitettiin myyntikohtaamisen toteutumista käytännössä. Opinnäytetyössä selvisi, että case-yrityksen toimintamallit on rakennettu asiakaslähtöisiä periaatteita noudattaen. Myös käytännön myyntikohtaamisessa asiakaslähtöisyys toteutuu laajalti, mutta muutamia kehityskohteita etenkin ensikontaktin ja asiakkaan yksilöllisen informoinnin osalta on löydettävissä. Lisäksi case-yrityksen suositellaan kiinnittävän huomiota myyjien itsevarmuuden lisäämiseen, joka parantaa työtyytyväisyyttä, myyjien toimintavapautta ja mahdollistaa asiakaslähtöisyyden kumpuamisen organisaatiosta asiakkaalle. Opinnäytetyö jättää tilaa jatkotutkimukselle. Etenkin case-yrityksen osalta olisi suositeltavaa järjestää työtyytyväisyyskysely B2B-myyntitiimin keskuudessa, jotta toimintaa voitaisiin kehittää sisäisesti. Opinnäytetyön kehitysehdotusten pohjalta case-yritys voi myös kohdistaa lisätutkimusta asiakkaiden kokemuksiin, ja selvittää laajemman kyselyn avulla seikkoja, joita asiakkaat toivovat yritykseltä.

Development of business processes and sales reporting - Case recovered paper

The purpose of this research is to discover development points for business processes and sales reporting in the recovered paper sourcing organization. The processes under development are both sales and sourcing processes that were determined by the commissioning company. All of these processes have in common that there are used sales orders to organize the money flows correctly. Although the main objective is to source only recovered paper, the sourcing also brings by-products that cannot be utilized and are thus sold. As the purpose of the sales function is to only support the sourcing strategy, it should be organized as efficiently as possible. Investigating the current status of the processes and finding development points help in building proposals for enhanced process descriptions. In order that sales function could be analyzed, should the sales reporting be accurate and present the needed key figures. The current status of the processes as well as the possible problems and development ideas were researched with the help of interviews. Best practices could also be brought from other business lines in the commissioning company. The theory part was build according to relevant literature and scientific articles. The research indicates, that processes have shaped differently in sourcing organization’s business units. Local infrastructure and legislation sets certain limitations to the sourcing of recovered paper, and these circumstances cannot be changed. Customer-supplier power relations also affect to the formulation of business processes. In order to steer the processes, there has to be more internal controls. Still, the enterprise resource planning system also sets boundaries how the processes can be made more efficient.