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A box graph is the intersection graph of a finite set of orthogonal rectangles in the plane. The problem of whether or not the maximum independent set problem (MIS for short) for box graphs can be approximated within a substantially sub-logarithmic factor in polynomial time has been open for several years. We show that for box graphs on n vertices which have an independent set of size Ω(n/logO(1)n
In the world of cryptography, stream ciphers are known as primitives used to ensure privacy over a communication channel. One common way to build a stream cipher is to use a keystream generator to produce a pseudo-random sequence of symbols. In such algorithms, the ciphertext is the sum of the keystream and the plaintext, resembling the one-time pad principal. Although the idea behind stream ciphe
Abstract is not available
Popular Abstract in Swedish Mykorrhiza är symbiosen mellan växters rötter och olika svampar. När en symbios har etablerats i en rot växer svampens mycel ut i marken och tar där upp näring som levereras till växten. I denna avhandling studerades hur man kan mäta detta mycel i marken med hjälp av biokemiska markörer. Vidare studerades hur detta myces påverkar övriga mikroorganismer i marken.The interactions between external mycorrhizal mycelia and saprophytic microorganisms were studied in experiments with growth chambers specially designed to enable the mycelia to develop in root-free soil compartments. The growth of the mycorrhizal mycelia was estimated by use of biochemical signature compounds. It was shown possible to estimate the biomass of the external mycelium of different ar
I denna artikel behandlar vi frågeställningar rörande plagiat i samband med programmering. Problematiken är relevant även för andra ämnen där man använder programmering som problemlösningsmetod eller där man använder ett begränsat formellt språk för redovisningar som t.ex. inom matematik. Vi diskuterar skillnader mellan program¬pla¬giering och uppsatsplagiering samt vilka system som finns för dete
BiB 2010 är en sammanställning av information om bedömningsinstrument med relevans för behandling och forskning inom missbruks- och beroendevården. Gemensamt för alla instrument i boken är att de är översata till eller utvecklade på svenska. Redan 1998 publicerades en första sammanställning, BIB 1998, som svar på ett uttryckt behov av en översikt över användbara mätmetoder och bedömningsinstrument
Popular Abstract in English As far as we know the Northern Fulmar (just referred to as Fulmar from her on), did not start breeding on the Faroe Islands before about 150 years ago. But it has been known by the Faroese for a long time. Mainly as a bad omen and according to folklore fishermen would return home if they encountered Fulmars when out at sea, since they believed it was the bringer of storThe Northern Fulmar (Fulmarus glacialis) is one of the most abundant seabirds in the Northern Hemisphere and the most abundant seabird on the Faroe Islands. Except from a few sporadic observations up until the 1950´s no study has focused on this species on the Faroe Islands. Being considered a significant consumer of marine resources in the Faroese marine ecosystem a closer study of this species´
Popular Abstract in Swedish Gipsgjutning är ganska enkelt. Blanda gipset med vatten och rör runt lite. Häll därefter blandningen i en form om du vill ha en gipshund eller så, eller i en tallrik om du vill trycka av en kroppsdel. Om du vill ha en handavgjutning så tryck dit handen en stund och låt gipset stelna. Sedan är det klart. Bara den hand du gjutit av kommer att passa; var det högerhanden såMolecular imprinting is a technique by which polymeric materials selective for a given target molecule can be created through a casting procedure. Functionalised monomers are added to a solution of molecular templates. Monomer-template complexes are formed and subsequently fixed through polymerisation, and following removal of the template species from the resultant molecularly imprinted polymer,
We report a cross-linguistic investigation of English-and Swedish-speaking children with specific language impairment (SLI) in an attempt to determine whether Wexler's (1998; 2003) (Extended) Unique Checking Constraint (EUCC) can account for the grammatical profiles of these groups of children. In Study 1, a group of Swedish-speaking preschoolers with SLI showed greater use of finite verb inflecti
This monograph presents a new model of the internal syntax of nominal phrases. The model is mainly based on Scandinavian, since with the wide range of variation that Scandinavian displays in the nominal domain, despite the close genetic relationship between the different varieties, Scandinavian is particularly well-suited for explorations into nominal syntax. Among the topics covered are the basic
The first model to predict chloride ingress into concrete was presented by Collepardi in 1970, in Italian! That model was used for some 20 years for design of concrete structures before it was realized that the main parameter, the apparent chloride diffusion coefficient, is not a material property! Since then the Collepardi model has been significantly improved and developed into more or less soph
