995 resultados para Gamma chain


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We propose robust estimators of the generalized log-gamma distribution and, more generally, of location-shape-scale families of distributions. A (weighted) Q tau estimator minimizes a tau scale of the differences between empirical and theoretical quantiles. It is n(1/2) consistent; unfortunately, it is not asymptotically normal and, therefore, inconvenient for inference. However, it is a convenient starting point for a one-step weighted likelihood estimator, where the weights are based on a disparity measure between the model density and a kernel density estimate. The one-step weighted likelihood estimator is asymptotically normal and fully efficient under the model. It is also highly robust under outlier contamination. Supplementary materials are available online.

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Tutkimus pyrkii selvittämään, kuinka tehokas suorituskykymittaristo voidaan parhaiten suunnitella pk-yrityksessä. Tutkimuksen tavoitteena on luoda suorituskykymittaristo pienen kohdeyrityksen johtajien tarpeisiin. Päähuomion kohteena on yrityksen tilaus-toimitusketju ja arvoverkko. Työ on luonteeltaan kvalitatiivinen toimintatutkimus, joka noudattaa toiminta-analyyttista tutkimusotetta. Työn teoriaosassa selvitetään, kuinka suorituskyvyn mittaaminen sekä materiaali-, tieto- ja rahavirtojen hallinta on kehittynyt viime vuosina pk-yrityksen näkökulmasta. Mittariston suunnittelu aloitetaan kohdeyrityksen perusteellisella analyysilla. Tämän pohjalta määritellään yrityksen kriittiset menestystekijät, joista lopulta johdetaan suorituskykymittarit. Tutkimuksen perusteella voidaan todeta, että yleinen asenne mittaamista kohtaan, strategian huomioinnin puute sekä tietojärjestelmien rajoitteet ovat päähaasteita pk-yrityksen suorituskyvyn mittaamisessa. Mittareiden tuleekin olla melko yksinkertaisia ja helppoja käyttää, jotta mittaamisen ei koettaisi kuluttavan rajallisia resursseja liikaa. Mittariston tulee kuitenkin antaa kokonaisvaltainen kuva yrityksen suorituskyvystä, johon vaikuttavat kaikki arvoverkon osapuolet ja heidän yhteistyö toistensa kanssa.

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Tällä tutkielmalla oli kaksi tavoitetta. Ensimmäinen tavoite oli selvittää, kuinka valittujen tuotteiden arvoa asiakkaiden silmissä voisi lisätä. Toisena tavoitteena oli selvittää tuotteiden arvon lisääntyminen arvoketjun jokaisella portaalla kartonkitehtaaltaloppuasiakkaalle. Tutkimuksen kohteena oli kolme erilaista arvoketjua. Tutkimusoli luonteeltaan kvalitatiivinen ja tarvittavat tiedot kerättiin haastatteluilla. Tutkimuksen tuloksena voidaan mainita, että asiakkaat arvostavat laskua kustannuksissa enemmän kuin lisähyötyjä. Myös prosentuaalinen arvonlisäys valittuihintuotteisiin arvoketjun eri portaissa saatiin selville. Tästä työstä on tehty kaksi versiota; tämä versio, joka tulee julkiseksi neljän vuoden salassapitoajan jälkeen, ja toinen versio, joka sisältää arkaluontoisempaa kustannusinformaatiotaja on siitä syystä kokonaan salainen.

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The protection of arginine (Arg) side chains is a crucial issue in peptide chemistry because of the propensity of the basic guanidinium group to produce side reactions. Currently, sulfonyl-type protecting groups, such as 2,2,5,7,8-pentamethylchroman (Pmc) and 2,2,4,6,7-pentamethyldihydrobenzofurane (Pbf), are the most widely used for this purpose. Nevertheless, Arg side chain protection remains problematic as a result of the acid stability of these two compounds. This issue is even more relevant in Arg-rich sequences, acid-sensitive peptides and large-scale syntheses. The 1,2-dimethylindole-3-sulfonyl (MIS) group is more acid-labile than Pmc and Pbf and can therefore be a better option for Arg side chain protection. In addition, MIS is compatible with tryptophan-containing peptides.

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A partir d'un disseny d'un silenciós, s'estudien tots els processos i la maquinària necessària per a implantar la fabricació en sèrie del producte, i d'aquesta manera es poden donar unes pautes generals per la fàbrica que haurà d'acollir aquest procés.

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VVALOSADE is a research project of professor Anita Lukka's VALORE research team in the Lappeenranta University of Technology. The VALOSADE includes the ELO technology program of Tekes. SMILE is one of four subprojects of the VALOSADE. The SMILE study focuses on the case of the company network that is composed of small and micro-sized mechanical maintenance service providers and forest industry as large-scale customers. The basic principle of the SMILE study is the communication and ebusiness in supply and demand networks. The aim of the study is to develop ebusiness strategy, ebusiness model and e-processes among the SME local service providers, and onthe other hand, between the local service provider network and the forest industry customers in a maintenance and operations service business. A literature review, interviews and benchmarking are used as research methods in this qualitative case study. The first SMILE report, 'Ebusiness between Global Company and Its Local SME Supplier Network', concentrated on creating background for the SMILE study by studying general trends of ebusiness in supply chains and networks of different industries. This second phase of the study concentrates on case network background, such as business relationships, information systems and business objectives; core processes in maintenance and operations service network; development needs in communication among the network participants; and ICT solutions to respond needs in changing environment. In the theory part of the report, different ebusiness models and frameworks are introduced. Those models and frameworks are compared to empirical case data. From that analysis of the empirical data, therecommendations for the development of the network information system are derived. In process industry such as the forest industry, it is crucial to achieve a high level of operational efficiency and reliability, which sets up great requirements for maintenance and operations. Therefore, partnerships or strategic alliances are needed between the network participants. In partnerships and alliances, deep communication is important, and therefore the information systems in the network also are critical. Communication, coordination and collaboration will increase in the case network in the future, because network resources must be optimised to improve competitive capability of the forest industry customers and theefficiency of their service providers. At present, ebusiness systems are not usual in this maintenance network. A network information system among the forest industry customers and their local service providers actually is the only genuinenetwork information system in this total network. However, the utilisation of that system has been quite insignificant. The current system does not add value enough either to the customers or to the local service providers. At present, thenetwork information system is the infomediary that share static information forthe network partners. The network information system should be the transaction intermediary, which integrates internal processes of the network companies; the network information system, which provides common standardised processes for thelocal service providers; and the infomediary, which share static and dynamic information on right time, on right partner, on right costs, on right format and on right quality. This study provides recommendations how to develop this system in the future to add value to the network companies. Ebusiness scenarios, vision, objectives, strategies, application architecture, ebusiness model, core processes and development strategy must be considered when the network information system will be developed in the next development step. The core processes in the case network are demand/capacity management, customer/supplier relationship management, service delivery management, knowledge management and cash flow management. Most benefits from ebusiness solutions come from the electrifying of operational level processes, such as service delivery management and cash flow management.

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VALOSADE (Value Added Logistics in Supply and Demand Chains) on Lappeenrannan teknillisen yliopiston ja sielläprofessori Anita Lukan VALORE -tutkimusryhmän toteuttama tutkimusprojekti, jonka rahoittaja on ollut Tekes. Projekti on osa Tekesin ELO - Elektronisen liiketoiminnan logistiikka - teknologiaohjelmaa. Tutkimusta rahoittivat Tekesin lisäksi neljä yritystä, jotka toimivat myös tutkimustyön kohteina ja toimivat tarpeen mukaan yhteistyössä tutkijoiden kanssa. Yritysten toimialat ovat metsäteollisuus, laitevalmistaja, joka tarjoaa myös tuotteilleen jälkimarkkinapalveluja sekä kaksi logistiikkapalveluyritystä. Tämä työraportti liittyy VALOSADE - tutkimusprojektin osaprojektiin Costfix (Paper Mill Process - from Fixed Costs into Variable Costs). Costfix - projektin tavoitteena on tutkia ja löytää paperiteollisuudelle uusia toimintamalleja, jotka mahdollistavat kiinteiden kustannusten muuttamisen muuttuviksi. Merkittävä tutkimuksen osa-alue on myös tutkimuskohteiden liike-toiminnan nykytilan aiempaa tarkempi selvittäminen. Tämä työraportti käsittelee kunnossapidon materiaalilogistiikan osalta tehtaan sisällä tapahtuvaa toimintaa, josta tässä tutkimuksessa käytetään nimitystä tehdaslogistiikka. Nykytilaselvityksen perusteella nykyinen prosessiteollisuudessa ja myös pääsääntöisesti valmistavassa teollisuudessa yleisesti vallitseva teollisuusyrityksen käyttöinvestointia ylläpitävän palveluprosessin toimintarakenne, johtamistapa ja prosessin operatiivisten tehtävien toimenkuvat eivät tue ko. palvelukokonaisuuden tehokasta ja tuloksellista toteuttamista. Nykymuotoinen toimintamalli pikemminkin rajoittaa toimintaprosessin kokonaishallintaa ja sen tehostamiseksi investoitujen uusien teknisten ratkaisujen ja teknologian käyttöönottoa. Lisäksi yleisesti vallitseva toimintakulttuuri (mm. arvokäsitykset, uskomukset sekä toiminnan ja tavoitteiden taustalla olevat motiivit) sekä vaikeuttaa nykyisen ja tulevan kilpailutilanteen edellyttämien tehokkuus- ja tuottavuustavoitteiden toteutumista että hidastaa uudistusten onnistumista edellyttävän muutoksen etenemistä yrityksen sisällä. Tutkimuksen tulokset vahvistivat osaltaan sen, että tehdas- ja toimintokeskeinen johtaminen aiheuttavat palveluprosessin eri tehtäville asetettujen tavoitteiden ja perustehtäväkäsityksen välille ristiriitoja, joista seuraa sekä suoria että välillisiä vaikutuksia teollisuusyrityksen tuotantoprosessin toiminnan laatuun ja tuotantolaitteiden käyttövarmuuteen. Palvelukokonaisuuteen kuuluvien eri toimintaprosessien tehtävät on jaettu ristiriitaisesti toiminnoille siten, että erityisestikunnossapidon teknisten toimihenkilöitten hoidettavana on sekä ihmisen henkilökohtaisen kapasiteettirajan ylittävä että toisistaan liian suuri erilaisia osaamisia ja ymmärrystä edellyttävä tehtävämäärä. Nykytilan palvelutuotannossa esiintyvien ongelmien seuraukset ja perussyyt osoittavat, että merkittävästi pääomia sitovan valmistavan teollisuuden (mm. prosessiteollisuus) käyttö-omaisuutta ylläpitävän palveluprosessin hallinta on ulkoistettava tehdastasolta itsenäisesti hoidettavaksi liiketoimintakokonaisuudeksi, jonka operatiivinen johtaminen tapahtuu toimintaprosesseittain konsernin ylätasolta käsin. Johtamismallissa painottuu prosessijohtaminen ja oman vastuualueen toimintaprosessin asiantuntemus. Lisäksi ihmisen osaamiseen, ymmärrykseen ja toimintatapaan perustuva palvelu edellyttää johtamiselta henkilöjohtamistaitoa ja osaamisen johtamista. Liiketoiminnan uudenlainen keskittyminen, verkostoituminen ja globalisoituminen edellyttävät johdoltamyös erilaisten toimintaverkostojen ja sidosryhmien toiminnan ja tarpeen ymmärtämistä. Tutkimustulosten perusteella myös palveluprosesseissa toimivien toimihenkilöitten tehtäväkuvia on muutettava radikaalisti ja osa uusista toimenkuvista edellyttää lisäksi henkilöitten osaamistason aktiivista parantamista. Tässä raportissa esitetään toimintamalli, jossa kuvataan tutkimuksen pohjalta luotu palvelukokonaisuuden johtamismalli ja palveluprosessien eri tehtävätasot tehtävineen. Kuvattu johtamismalli on ollut jo yleisesti käytössä yksittäisillä palvelualoilla, mutta tässä esitetty malli on valmistavan yrityksen teknisiin tukipalveluihin muokattu sovellus.

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Abstract The research problem in the thesis deals with improving the responsiveness and efficiency of logistics service processes between a supplier and its customers. The improvement can be sought by customizing the services and increasing the coordination of activities between the different parties in the supply chain. It is argued that to achieve coordination the parties have to have connections on several levels. In the framework employed in this research, three contexts are conceptualized at which the linkages can be planned: 1) the service policy context, 2) the process coordination context, and 3) the relationship management context. The service policy context consists of the planning methods by which a supplier analyzes its customers' logistics requirements and matches them with its own operational environment and efficiency requirements. The main conclusion related to the service policy context is that it is important to have a balanced selection of both customer-related and supplier-related factors in the analysis. This way, while the operational efficiency is planned a sufficient level of service for the most important customers is assured. This kind of policy planning involves taking multiple variables into the analysis, and there is a need to develop better tools for this purpose. Some new approaches to deal with this are presented in the thesis.The process coordination context and the relationship management context deal with the issues of how the implementation of the planned service policies can be facilitated in an inter-organizational environment. Process coordination includes typically such mechanisms as control rules, standard procedures and programs, but inhighly demanding circumstances more integrative coordination mechanisms may be necessary. In the thesis the coordination problems in third-party logistics relationship are used as an example of such an environment. Relationship management deals with issues of how separate companies organize their relationships to improve the coordination of their common processes. The main implication related to logistics planning is that by integrating further at the relationship level, companies can facilitate the use of the most efficient coordination mechanisms and thereby improve the implementation of the selected logistics service policies. In the thesis, a case of a logistics outsourcing relationship is used to demonstrate the need to address the relationship issues between the service provider andthe service buyer before the outsourcing can be done.The dissertation consists of eight research articles and a summarizing report. The principal emphasis in the articles is on the service policy planning context, which is the main theme of six articles. Coordination and relationship issues are specifically addressed in two of the papers.

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Microphthalmia with linear skin defects (MLS) syndrome is an X-linked male-lethal disorder also known as MIDAS (microphthalmia, dermal aplasia, and sclerocornea). Additional clinical features include neurological and cardiac abnormalities. MLS syndrome is genetically heterogeneous given that heterozygous mutations in HCCS or COX7B have been identified in MLS-affected females. Both genes encode proteins involved in the structure and function of complexes III and IV, which form the terminal segment of the mitochondrial respiratory chain (MRC). However, not all individuals with MLS syndrome carry a mutation in either HCCS or COX7B. The majority of MLS-affected females have severe skewing of X chromosome inactivation, suggesting that mutations in HCCS, COX7B, and other as-yet-unidentified X-linked gene(s) cause selective loss of cells in which the mutated X chromosome is active. By applying whole-exome sequencing and filtering for X-chromosomal variants, we identified a de novo nonsense mutation in NDUFB11 (Xp11.23) in one female individual and a heterozygous 1-bp deletion in a second individual, her asymptomatic mother, and an affected aborted fetus of the subject's mother. NDUFB11 encodes one of 30 poorly characterized supernumerary subunits of NADH:ubiquinone oxidoreductase, known as complex I (cI), the first and largest enzyme of the MRC. By shRNA-mediated NDUFB11 knockdown in HeLa cells, we demonstrate that NDUFB11 is essential for cI assembly and activity as well as cell growth and survival. These results demonstrate that X-linked genetic defects leading to the complete inactivation of complex I, III, or IV underlie MLS syndrome. Our data reveal an unexpected role of cI dysfunction in a developmental phenotype, further underscoring the existence of a group of mitochondrial diseases associated with neurocutaneous manifestations.

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Magneto-active polymers are a class of smart materials commonly manufactured by mixing micron-sized iron particles in a rubber-like matrix. When cured in the presence of an externally applied magnetic field, the iron particles arrange themselves into chain-like structures that lend an overall anisotropy to the material. It has been observed through electron micrographs and X-ray tomographs that these chains are not always perfect in structure, and may have dispersion due to the conditions present during manufacturing or some undesirable material properties. We model the response of these materials to coupled magneto-mechanical loading in this paper using a probability based structure tensor that accounts for this imperfect anisotropy. The response of the matrix material is decoupled from the chain phase, though still being connected through kinematic constraints. The latter is based on the definition of a 'chain deformation gradient' and a 'chain magnetic field'. We conclude with numerical examples that demonstrate the effect of chain dispersion on the response of the material to magnetoelastic loading.

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The objective of the present study was longitudinal evaluation of the volumetric tumor response and functional results after Gamma Knife radiosurgery of vestibular schwannomas, performed according to the modern standards of treatment. From October 2003 to September 2007, 133 consecutive patients with vestibular schwannomas were treated according to the concept of robotic Gamma Knife microradiosurgery, which is based on precise irradiation of the lesion, sparing adjacent structures, and delivery of the high radiation energy to the target. Multiple small-sized isocenters located within the border of the neoplasm were applied. The mean marginal dose was 11.5 Gy (range, 11-12 Gy). In total, 126 cases with a minimum posttreatment follow-up of 2 years (range, 2-7 years; median, 4 years) were analyzed. Temporary enlargement was noted in 25 % of tumors at 6 months after radiosurgery. At 3 years of follow-up, tumor shrinkage, stabilization, and increase in volume were marked in 73 %, 23 %, and 4 % of cases, respectively. All progressing lesions spontaneously stabilized later on and did not require additional management. In 3 % of patients, transitory impairment of the facial nerve function was marked; however, neither its permanent dysfunction nor trigeminal neuropathy attributed to radiosurgery was noted. Impairment of hearing compared to its pretreatment level was revealed in 4 %, 12 %, 13 %, and 16 % of patients at 6 months, 1 year, 2 years, and 3 years after radiosurgery, respectively, and this trend was statistically significant (P = 0.0042). Overall, 77 % of patients with serviceable hearing before treatment preserved it 3 years thereafter. In conclusion, modern Gamma Knife radiosurgery provides effective and safe management of vestibular schwannomas. Nevertheless, possible temporary tumor enlargement, delay of its growth arrest, transient dysfunction of the cranial nerves, and gradual deterioration of hearing after irradiation should be always taken into consideration.

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After the release of the gamma-ray source catalog produced by the Fermi satellite during its first two years of operation, a significant fraction of sources still remain unassociated at lower energies. In addition to well-known high-energy emitters (pulsars, blazars, supernova remnants, etc.), theoretical expectations predict new classes of gamma-ray sources. In particular, gamma-ray emission could be associated with some of the early phases of stellar evolution, but this interesting possibility is still poorly understood. Aims: The aim of this paper is to assess the possibility of the Fermi gamma-ray source 2FGL J0607.5-0618c being associated with the massive star forming region Monoceros R2. Methods: A multi-wavelength analysis of the Monoceros R2 region is carried out using archival data at radio, infrared, X-ray, and gamma-ray wavelengths. The resulting observational properties are used to estimate the physical parameters needed to test the different physical scenarios. Results: We confirm the 2FGL J0607.5-0618c detection with improved confidence over the Fermi two-year catalog. We find that a combined effect of the multiple young stellar objects in Monoceros R2 is a viable picture for the nature of the source.