Decoupling between Lovelace’s checker server and main server

Abstract. Thesis provides an introduction to online learning environment Lovelace, defnes its coupling issues, and narrates the process of decoupling those issues. The tools that are used in the Lovelace system’s components main features and their role in the system are described and the term decoupling is explained to the reader. The system has a coupling issue between the main server and checker service; checker service has read and write access to the main server’s database and that needs to be revoked. In addition, Lovelace system utilizes network fle system to share fles between the checker service and the main server. For decoupling the system, a solution is designed and implemented that revokes those read and write rights and also strips the need for the network fle system. Solution for the issue has a three-step design where iterations are in order of importance. Iterations of the design are: revoking the write access; revoking the read access; and lastly the consideration regarding the use of network fle system. Implementation of the solution consist of creation of the development platform and each iteration of the implementation design. Evaluation is structured in a similar manner as the implementation. Each iteration of the implementation is evaluated as its own and evaluation is also given to the development platform. The evaluation itself consists of discussion and observations that are made from the implementations and its outcomes.Lovelacen tarkastinpalvelimen ja pääpalvelimen irtikytkentä. Tiivistelmä. Tutkielma esittelee verkko-oppimisympäristö Lovelacen, määrittelee oppimisympäristön kytkentäongelmat sekä kuvailee irtikytkennän vaiheet, että näiden vaiheiden ongelmat. Lovelace-järjestelmän komponentit ja niiden olennaisimmat ominaisuudet, sekä rooli järjestelmän toiminnassa on selitetty, ja termi irtikytkentä selitetään lukijalle. Järjestelmässä on kytkentäongelma pääpalvelimen sekä tarkistuspalvelimen välillä. Tarkistuspalvelimella on sekä luku- että kirjoitusoikeudet järjestelmän pääpalvelimen tietokantaan, jotka täytyy kumota. Järjestelmä jakaa myös tiedostoja lähiverkon yli palvelimelta toiselle, joka on osa palvelimien tiedonvaihtoa. Irtikytkentää varten suunnitellaan sekä toteutetaan ratkaisu, jolla tarkistinpalvelimen luku- ja kirjoitusoikeus pääpalvelimen tietokantaan evätään ja tiedostojen jaon tarve verkon yli lopetetaan. Toteutuksen ratkaisumalli on kolmeportainen, tärkeysjärjestykseen listattuna. Ratkaisumallin vaiheet ovat: tarkistuspalvelimen kirjoitusoikeuden kumoaminen, tarkistuspalvelimen tietokannan lukuoikeuden kumoaminen sekä tiedostojen verkon yli jakamisen tarpeellisuuden arviointi. Projektin toteutus koostuu kehitysympäristön rakentamisesta, sekä ratkaisumallin jokaisesta vaiheesta. Toteutuksen arviointi on jäsennelty alkuperäistä ratkaisumallia vastaavasti, arviointi tapahtuu erikseen jokaiselle vaiheelle sekä kehitysympäristö arvioidaan. Arviointi koostuu keskustelusta sekä havainnoista, joita toteutuksesta havaitaan

Genome sequencing and population genomic analyses provide insights into the adaptive landscape of silver birch

Silver birch (Betula pendula) is a pioneer boreal tree that can be induced to flower within 1 year. Its rapid life cycle, small (440-Mb) genome, and advanced germplasm resources make birch an attractive model for forest biotechnology. We assembled and chromosomally anchored the nuclear genome of an inbred B. pendula individual. Gene duplicates from the paleohexaploid event were enriched for transcriptional regulation, whereas tandem duplicates were overrepresented by environmental responses. Population resequencing of 80 individuals showed effective population size crashes at major points of climatic upheaval. Selective sweeps were enriched among polyploid duplicates encoding key developmental and physiological triggering functions, suggesting that local adaptation has tuned the timing of and cross-talk between fundamental plant processes. Variation around the tightly-linked light response genes PHYC and FRS10 correlated with latitude and longitude and temperature, and with precipitation for PHYC. Similar associations characterized the growth-promoting cytokinin response regulator ARR1, and the wood development genes KAK and MED5A.Peer reviewe

Author Correction: Genome sequencing and population genomic analyses provide insights into the adaptive landscape of silver birch.

In the version of this article initially published, there was a mistake in the calculation of the nucleotide mutation rate per site per generation: 1 × 10−9 mutations per site per generation was used, whereas 9.5 × 10−9 was correct. This error affects the interpretation of population-size changes over time and their possible correspondence with known geological events, as shown in the original Fig. 4 and supporting discussion in the text, as well as details in the Supplementary Note. Neither the data themselves nor any other results are affected. Figure 4 has been revised accordingly. Images of the original and corrected figure panels are shown in the correction notice

Genome sequencing and population genomic analyses provide insights into the adaptive landscape of silver birch

Abstract Silver birch (Betula pendula) is a pioneer boreal tree that can be induced to flower within 1 year. Its rapid life cycle, small (440-Mb) genome, and advanced germplasm resources make birch an attractive model for forest biotechnology. We assembled and chromosomally anchored the nuclear genome of an inbred B. pendula individual. Gene duplicates from the paleohexaploid event were enriched for transcriptional regulation, whereas tandem duplicates were overrepresented by environmental responses. Population resequencing of 80 individuals showed effective population size crashes at major points of climatic upheaval. Selective sweeps were enriched among polyploid duplicates encoding key developmental and physiological triggering functions, suggesting that local adaptation has tuned the timing of and cross-talk between fundamental plant processes. Variation around the tightly-linked light response genes PHYC and FRS10 correlated with latitude and longitude and temperature, and with precipitation for PHYC. Similar associations characterized the growth-promoting cytokinin response regulator ARR1, and the wood development genes KAK and MED5A

Genome sequencing and population genomic analyses provide insights into the adaptive landscape of silver birch

Silver birch (Betula pendula) is a pioneer boreal tree that can be induced to flower within 1 year. Its rapid life cycle, small (440-Mb) genome, and advanced germplasm resources make birch an attractive model for forest biotechnology. We assembled and chromosomally anchored the nuclear genome of an inbred B. pendula individual. Gene duplicates from the paleohexaploid event were enriched for transcriptional regulation, whereas tandem duplicates were overrepresented by environmental responses. Population resequencing of 80 individuals showed effective population size crashes at major points of climatic upheaval. Selective sweeps were enriched among polyploid duplicates encoding key developmental and physiological triggering functions, suggesting that local adaptation has tuned the timing of and cross-talk between fundamental plant processes. Variation around the tightly-linked light response genes PHYC and FRS10 correlated with latitude and longitude and temperature, and with precipitation for PHYC. Similar associations characterized the growth-promoting cytokinin response regulator ARR1, and the wood development genes KAK and MED5A