Handshake ecosystem for Educational Contents between Institutional Repository and OER based Repository

Poster at Open Repositories 2014, Helsinki, Finland, June 9-13, 2014

Mutual binding of polymer end-groups by complementary π–π-stacking: a molecular “Roman Handshake”

Self-complementary tweezer-molecules based on a naphthalenediimide core self-assemble into supramolecular dimers through mutual π–π-stacking and hydrogen bonding. The resulting motif is extremely stable in solution (Ka = 105 M−1), and its attachment to one terminal position of a poly(ethylene glycol) chain leads to a doubling of the polymer's apparent molecular weight.

What's in a handshake? Exploring business-to-business relational exchange

Despite its importance in the development of competitive advantage, attempts to unify diverse classifications of business-to-business relational exchange (B2B RE) have been largely unsuccessful. We used 18 semi-structured, in-depth interviews with managers from a range of industries to explore the B2B RE construct. Analysis of the data revealed that B2B RE comprises five key dimensions. These are communication, understanding, commitment, trust and power symmetry. The research identifies the importance of personal interaction in business relationships and provides additional insights into the importance of affective commitment. In addition we uncover a number of negative consequences of affective commitment, which have been previously unexplored. This research contributes to the domain of B2B research by synthesising and advancing knowledge in this area to provide a new conceptual framework of B2B RE and directions for future research.

What's in a handshake?:exploring business-to-business relational exchange

DUE TO COPYRIGHT RESTRICTIONS ONLY AVAILABLE FOR CONSULTATION AT ASTON UNIVERSITY LIBRARY AND INFORMATION SERVICES WITH PRIOR ARRANGEMENT

Kättelyn merkitykset suomalaisessa tapakulttuurissa 1800-luvulta 2000-luvulle

Tutkimuksen aiheena on kättely suomalaisessa tapakulttuurissa 1800-luvulta 2000-luvulle. Tutkimuksen tarkoituksena on ollut selvittää, mitä kättely on suomalaisille tutkimusajankohtana merkinnyt. Kättelyä suomalaisessa tapakulttuurissa on tarkasteltu muistitietoaineiston avulla.Ensisijainen aineisto sisältää kättelyyn liittyviä ajatuksia ja kokemuksia yli tuhannelta suomalaiselta. Aineiston käsittely ei kuitenkaan perustu niiden määrälliseen tutkimiseen, vaan tutkimusmenetelmänä on käytetty laadullista tutkimusotetta, jonka ytimessä on merkitysten tulkinta. Väitöskirjassa kättelyä lähestytään kulttuurihistoriallisena, monitasoisena ilmiönä, josta on erotettavissa kestoltaan eripituisia historiallisuuden tasoja. Myös väitöskirjan rakenne seuraa tätä historiallisen monikerroksellisuuden ajatusta. Ensiksi kättelystä on erotettavissa biologiaan perustuva niin kutsuttu syvän historian taso, joka tekee kättelystä merkityksellisen luottamuksellisten suhteiden ja yhteistoiminnan alueella. Toiseksi kättelystä voidaan erottaa rakenteiden tasolla ilmenevä ja hitaasti muuttuva tapakulttuurin taso. Mutta vaikka tapakulttuurin säännöt osaltaan vaikuttavat siihen, miten henkilö tietyssä tilanteessa käyttäytyy, on toimija kättelytilanteessa kuitenkin valintoja tekevä yksilö. Kolmas tutkimuksessa erotettu taso onkin tapahtumahetken taso, jolla historiallinen toimija suorittaa valintojaan oman henkilöhistoriansa ja elämänkokemuksensa avulla. Historialliseen monikerroksellisuuteen liittyvän ajattelun kautta tutkimus osoittaa kättelyn monisyiseksi ilmiöksi, joka vaikuttaa inhimilliseen vuorovaikutukseen olennaisella tavalla. Tutkimusote myös nivoo ihmisen kehityshistorian opittuun tapakulttuuriin sekä tapahtumahetken aktiiviseen kättelytoimijuuteen. Tuloksista voidaan päätellä, ettei kättely ole suomalaisille merkityksetön toiminto, vaan tärkeä sosiaalinen väline, jonka syvempi ymmärtäminen vaatii kaikkien historiallisten tasojen tarkastelua. Eri historian kerrokset voivat olla yksittäisessä kättelytapahtumassa kaikki läsnä. Julkisessa keskustelussa kättely on ollut esillä epähygieenisyytensä vuoksi. Väitöskirjatutkimuksessa pohditaan myös kättelyn suhdetta mikrobien leviämiseen. Tutkimus osoittaa, että kättelyllä on kahtalaisia turvallisuuteen liittyviä merkityksiä: toisaalta se on lääketieteellinen riski, mutta toisaalta se saa sellaisia tapoihin ja hyvinvointiin liittyviä merkityksiä kuten yhteisöllisyys ja luottamus. Pohdittaessa kättelyn ja käsihygienian suhdetta tulevaisuudessa nämä seikat tulisi tiedostaa ja tuoda selkeästi esiin.

Readout architectures for hybrid pixel detector readout chips

The original contribution of this thesis to knowledge are novel digital readout architectures for hybrid pixel readout chips. The thesis presents asynchronous bus-based architecture, a data-node based column architecture and a network-based pixel matrix architecture for data transportation. It is shown that the data-node architecture achieves readout efficiency 99% with half the output rate as a bus-based system. The network-based solution avoids “broken” columns due to some manufacturing errors, and it distributes internal data traffic more evenly across the pixel matrix than column-based architectures. An improvement of > 10% to the efficiency is achieved with uniform and non-uniform hit occupancies. Architectural design has been done using transaction level modeling (TLM) and sequential high-level design techniques for reducing the design and simulation time. It has been possible to simulate tens of column and full chip architectures using the high-level techniques. A decrease of > 10 in run-time is observed using these techniques compared to register transfer level (RTL) design technique. Reduction of 50% for lines-of-code (LoC) for the high-level models compared to the RTL description has been achieved. Two architectures are then demonstrated in two hybrid pixel readout chips. The first chip, Timepix3 has been designed for the Medipix3 collaboration. According to the measurements, it consumes < 1 W/cm^2. It also delivers up to 40 Mhits/s/cm^2 with 10-bit time-over-threshold (ToT) and 18-bit time-of-arrival (ToA) of 1.5625 ns. The chip uses a token-arbitrated, asynchronous two-phase handshake column bus for internal data transfer. It has also been successfully used in a multi-chip particle tracking telescope. The second chip, VeloPix, is a readout chip being designed for the upgrade of Vertex Locator (VELO) of the LHCb experiment at CERN. Based on the simulations, it consumes < 1.5 W/cm^2 while delivering up to 320 Mpackets/s/cm^2, each packet containing up to 8 pixels. VeloPix uses a node-based data fabric for achieving throughput of 13.3 Mpackets/s from the column to the EoC. By combining Monte Carlo physics data with high-level simulations, it has been demonstrated that the architecture meets requirements of the VELO (260 Mpackets/s/cm^2 with efficiency of 99%).

RMAC-M: Extending the R-MAC Protocol for an Energy Efficient, Delay Tolerant Underwater Acoustic Sensor Network application with a mobile data mule node

One of the major applications of underwater acoustic sensor networks (UWASN) is ocean environment monitoring. Employing data mules is an energy efficient way of data collection from the underwater sensor nodes in such a network. A data mule node such as an autonomous underwater vehicle (AUV) periodically visits the stationary nodes to download data. By conserving the power required for data transmission over long distances to a remote data sink, this approach extends the network life time. In this paper we propose a new MAC protocol to support a single mobile data mule node to collect the data sensed by the sensor nodes in periodic runs through the network. In this approach, the nodes need to perform only short distance, single hop transmission to the data mule. The protocol design discussed in this paper is motivated to support such an application. The proposed protocol is a hybrid protocol, which employs a combination of schedule based access among the stationary nodes along with handshake based access to support mobile data mules. The new protocol, RMAC-M is developed as an extension to the energy efficient MAC protocol R-MAC by extending the slot time of R-MAC to include a contention part for a hand shake based data transfer. The mobile node makes use of a beacon to signal its presence to all the nearby nodes, which can then hand-shake with the mobile node for data transfer. Simulation results show that the new protocol provides efficient support for a mobile data mule node while preserving the advantages of R-MAC such as energy efficiency and fairness.

QUIC tramite udp: un’indagine sul protocollo che intende velocizzare il web

In questo documento ho analizzato lo scenario della passata e dell’odierna Internet, dal classico protocollo HTTP, al protocollo sperimentale QUIC, argomento di questa tesi. In primis ho analizzato gli attuali protocolli utilizzati nella rete e ricercato i motivi che hanno portato a crearne di nuovi, successivamente ho effettuato un analisi teorica del protocollo affidandomi ai documenti forniti dall'IETF, poi in un capitolo a sé ho descritto l'handshake crittografato tipico di questo protocollo ed infine nell'ultimo capitolo ho mostrato graficamente e praticamente come lavora il protocollo in una reale implementazione. Dopo aver completato questa tesi, mi sono potuto rendere conto di quanto sia necessario un cambio di rotta verso protocolli di rete più veloci, sicuri ed affidabili. I classici protocolli oramai non sono più sufficienti a soddisfare le migliaia di richieste di connessione e presentano, come si vedrà, delle lacune a cui bisogna porre rimedio. Gran parte della popolazione mondiale ha accesso al web,ed è uno strumento ormai alla portata di tutti e non più privilegio di pochi e ci si augura per il bene della rete Internet che tale protocollo o protocolli simili possano prendere presto piede per una migliore esperienza di navigazione a livello globale. Probabilmente saranno necessari molti anni, ma l’idea che già si pensi ad un futuro non tanto prossimo fa ben sperare su quello che ci aspetta. Nella lettura di questa tesi si vedrà come queste ultime affermazioni possano diventare realtà.

Connection Establishment Algorithm for Multidestination Protocol

Connection establishment is a fundamental function for any connection-oriented network protocol and the efficiency of this function defines the flexibility and responsiveness of the protocol. This process initializes data transmission and performs transmission parameters negotiation, what makes it mandatory process and integral part of entire transmission. Thus, the duration of the connection establishment will affect the transmission process duration. This paper describes an implementation of a handshake algorithm, designed for connection with multiple peers, that is used in Reliable Multi-Destination Transport(RMDT) protocol, its optimization and testing.

From Hardware Processes to asynchronous circuits via petri nets: An Application to Arbiter Design

International audience