• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 9
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 15
  • 4
  • 4
  • 3
  • 3
  • 3
  • 3
  • 3
  • 3
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Predictive Regression Model Evaluation : Evaluating Predictive Machine Learning Models to Reduce Food Waste in the Dairy Industry / Utvärdering av prediktiva regressionsmodeller : Utvärdering av prediktiva maskininlärningsmodeller för att minska matsvinn i mejeriindustrin

Carlsson, Alexander January 2023 (has links)
Food waste in the food industry is often a result from the complex nature of food production. Uncertainty is always present as yields vary and as there is a chain of consumer demand from stores to producers. Food waste is a waste of both natural and economic resources affecting both the planet and the producer. The environmental impact is further affected as excessive production that leads to waste correlates to an excessive carbon footprint from excessive farming, transports, and processing. Additional environmental impacts are excessive land usage and overfertilization. In order to aid in the reduction of food waste in the food industry, this thesis evaluates a machine learning approach to predicting commercial waste. This thesis evaluates 11 predictive machine learning models on their predictability on commercial food waste at a large product producing company in the dairy industry. The models are evaluated according to the two metrics; Root Mean Squared Error (RMSE) and Mean Absolute Error (MAE). Based on the models’ RMSE and MAE metrics, the Random Forest model proved to be the most suitable model. It presented the best and statistically significant RMSE. It also produced the best MAE but without statistical significance to gradient boost and Support Vector Regression (SVR), indicating that the difference in performance between the models, according to MAE, are within a variation span that can occur due to chance. / Matsvinn inom matrindustirn är ofta ett resultat av komplexiteten inom matproduktion. Variation i skördar och efterfrågan genom hela kedjan av kunder och konsumenter är alla bidragande faktorer. Matsvinn är ett slöseri på både naturliga och ekonomiska resurser som påverkar både miljön och produktionsbolagets ekonomi negativt. Miljöpåverkan påverkas ytterligare då överproduktion som leder till avfall korrelerar med överdrivet utsfläpp av koldioxid från överdrivet jordbruk, transporter, och tillverkning. Överproduktion av mat leder även till överdriven använding av mark och övergödning. För att bidra till minskat matsvinn i matindustrin, utvärderar denna avhandling 11 prediktiva regressionsmodeller om deras förmåga att förutse matsvinn inom produktion vid en mejeriproducent. Modellerna utvärderas enligt två mått; RMSE och MAE. Baserat på modellernas RMSE-mått visade sig Random Forest vara den mest lämpliga modellen. Den producerade bäst och statistiskt signifikant RMSE. Modellen producerade även bäst MAE men icke signifikanta resultat till gradient boost och SVR indikerar skillnaden mellan dessa modellers prestanda, enligt MAE, ligger inom ramen för slumpmässig varians.
12

A Century of Overproduction in American Agriculture

Ruffing, Jason L. 08 1900 (has links)
American agriculture in the twentieth century underwent immense transformations. The triumphs in agriculture are emblematic of post-war American progress and expansion but do not accurately depict the evolution of American agriculture throughout an entire century of agricultural depression and economic failure. Some characteristics of this evolution are unprecedented efficiency in terms of output per capita, rapid industrialization and mechanization, the gradual slip of agriculture's portion of GNP, and an exodus of millions of farmers from agriculture leading to fewer and larger farms. The purpose of this thesis is to provide an environmental history and political ecology of overproduction, which has lead to constant surpluses, federal price and subsidy intervention, and environmental concerns about sustainability and food safety. This project explores the political economy of output maximization during these years, roughly from WWI through the present, studying various environmental, economic, and social effects of overproduction and output maximization. The complex eco system of modern agriculture is heavily impacted by the political and economic systems in which it is intrinsically embedded, obfuscating hopes of food and agricultural reforms on many different levels. Overproduction and surplus are central to modern agriculture and to the food that has fueled American bodies for decades. Studying overproduction, or operating at rapidly expanding levels of output maximization, will provide a unique lens through which to look at the profound impact that the previous century of technological advance and farm legislation has had on agriculture in America.
13

A Game of Nods and Winks : En studie om faktorer som påverkar svenska börsbolags användning av resultatmanipulering / A Game of Nods and Winks : A study on underlying factors that affect the use of Earnings management in Swedish public companies

Jensen, Ola, Sannéus, Daniel January 2017 (has links)
Titel: A Game of Nods and Winks - En studie om faktorer som påverkar svenska börsbolagsanvändning av resultatmanipulering Bakgrund: Resultatmanipulering är att omdiskuterat ämne i Europa såväl som i USA.Resultatmanipulering har konstaterats frekvent användas i svenska bolag. Vi frågar oss vilkabakomliggande faktorer kan påverka mängden av resultatmanipulation. Syfte: Studiens syfte avser att förklara hur analytikers prognoser och andelen kvinnligastyrelseledamöter påverkar resultatmanipuleringen i svenska noterade bolag. Metod: En tvärsnittsstudie med en deduktiv ansats genomförs där teorier testats viahypotesprövning. Teorierna Positiv redovisningsteori, Agentteori, Prospect theory och Critical Mass theory avser att behandla de incitament som ligger till grund förresultatmanipulering. Urvalet består av Stockholmsbörsens Large, Mid, Small Cap bolagunder åren 2012 till 2016. Slutsatser: Resultatet påvisar att företag har en stark vilja nå analytikers prognoser samt atten hög andel kvinnliga styrelseledamöter har en negativ påverkan på företagets vilja atttillämpa resultatmanipulering. Vi kan i studien även visa en interaktionseffekt mellan de tvåfaktorerna. / Title: A Game of Nods and Winks - A study on underlying factors that affect the use of Earnings management in Swedish public companies Background: Earnings management is a subject of discussion in Europe as well in the United States. Earnings management has been found to be frequently used in Swedish companies. We ask ourselves what the underlying factors are and how can they affect the amount of Earnings management. Purpose: The main purpose of this study is to investigate how analysts’ forecasts and a high proportion of female board members affects how public Swedish companies manage their earnings through Earnings management. Method: A quantitative cross-sectional study with a deductive approach are performed and theories constitutes the basis for our hypothesis. The theories; Positive accounting theory, Agency theory, Prospect theory and Critical Mass theory intends to deal with the incentives behind Earnings management. The observation period is 2012 to 2016 and consists of companies from the Stockholm stock exchange market. Conclusions: The result concludes that companies have strong incentives to reach analysts’ forecasts and that a high percentage of female representation on the board have a negatively impact on company’s willingness to manage their earnings. In the study, we can also detect an interaction effect between the two variables.
14

Lean production in the aggregate stone industry: The road to becoming more sustainable and productive : A case study for a Swedish construction company

Abrahamsson, Ludwig, Ramsten, Oscar January 2022 (has links)
The aggregate stone industry produces stone – a critical material for the construction industry value chain, and is, thus, a valuable resource for building materials, highlighting the society’s need for critical products. The stone is mined and refined in so-called quarries. Yet, the industry is classified as an environmentally hazardous activity as it has traditional ways of consuming fossil fuels. Given that the industry is hazardous, the aggregate stone business needs to become more sustainable.  This master's thesis was carried out at a large Swedish construction company and the aggregate stone industry. Where perceptions of challenges around sustainability, and productivity were studied, these three pillars have permeated the work. Due to the hazardous industry, there is a need to reconcile and implement related tensions concerning Lean principles and circular economy in the traditional industries as construction. Because sustainability is the praxis in today's society. Since the process changes have a significant role in Lean, which strives to create flows and minimise waste of resources through various efficiencies. In order to make the industry more sustainable, the circular economy is an approach for maintaining a favourable environment and reducing waste, as well as adopting useful mechanisms and processes as recycling and reuse. This study focuses on the economic and environmental aspects of sustainability. Based on the study results, the aggregate stone industry should adapt its organisation to work towards the Lean principles and circular economy to be more favourable in these two aspects. Data were collected through interviews with experts in the aggregate stone industry and through observations at selected facilities. Production and workflow in the industry should be prioritised to focus on developing the six themes examined across the value-chain: location, machinery, resources, communication and information, the employees and finally, the end-user. Increased awareness and knowledge in these areas and sustainability would mean better conditions for the companies to invest in financial and environmental resources to achieve a competitive advantage – a leading role in the industry. / Stenindustrin producerar sten – vilket är ett kritiskt material för byggbranschens värdekedja, och är därmed en värdefull resurs för byggmaterial som lyfter fram samhällets behov av kritiska produkter. Stenen bryts och förädlas i så kallade stenbrott. Trots allt klassas branschen som en miljöfarlig verksamhet eftersom den har traditionella sätt att konsumera fossila bränslen, vilket leder till att stenverksamheten behöver bli mer hållbar. Detta examensarbete har genomförts på ett stort svenskt byggföretag och inom stenindustrin. Där uppfattningar om utmaningar kring hållbarhet och produktivitet har studerats vilket har genomsyrat arbetet. I och med den miljöfarliga branschen finns det ett behov av att förena och implementera förändringar relaterade till teorier. Teorierna Lean och cirkulär ekonomi kan anses som ett traditionellt sätt för att motverka den miljöfarliga branschen som bygg- och anläggningsbranschen upprätthåller, då hållbarhet är en praxis i dagens samhälle. Givet de betraktade teorier, har processförändringar en betydande roll inom Lean, som strävar efter att skapa flöden och minimera slöseri med resurser genom olika effektiviseringar. För att göra branschen mer hållbar är den cirkulära ekonomin ett tillvägagångssätt för att upprätthålla en gynnsam miljö och minska avfallet, samt upprätthålla användbara mekanismer och processer som återvinning och återanvändning. Denna studie fokuserar på de ekonomiska och miljömässiga aspekterna inom hållbarhet. Baserat på studieresultaten bör stenmaterialsindustrin anpassa sin organisation för att arbeta mot Lean-principerna och den cirkulära ekonomin för att vara mer gynnsam i dessa två aspekter. Data samlades in genom intervjuer med experter inom bergtäktsindustrin och genom observationer på utvalda anläggningar. Produktion och förvaltning bör prioriteras i branschen för att fokusera på att utveckla de sex teman som granskas över hela värdekedjan: plats, maskiner, resurser, kommunikation och information, de anställda och slutligen slutanvändaren. Ökad medvetenhet och kunskap inom dessa områden och hållbarhet skulle innebära bättre förutsättningar för företagen att investera i ekonomiska och miljömässiga resurser för att uppnå en konkurrensfördel– en ledande roll inom branschen.
15

Diskuse priorit výzkumu socioekonomických determinant obezity / Discussion of research priorities of socio-economic determinants of obesity

Voglová, Daniela January 2012 (has links)
This work follows the studies focused on obesity, its global extent and its serious health and economic impact. At the same time, the work examines the unsuccessful fight of public policies which try to reverse growing prevalence of obesity. Nevertheless, the main goal of the thesis is a discussion about priorities of new orientation in the research on the causes of the obesity epidemic and effectiveness of precautions that were taken in many countries and international organizations with the main aim to stop the obesity and its consequences. The discussion leads to the more detailed description of the problems connected with obesity, for instance, environmental aspects, housing culture in relation to physical activities, lifestyle in relation to advertisement/marketing, psychological and socio- psychological aspects, combating stress, etc. My intention was to find out utility of contemporary research on obesity for setting of policy fighting against obesity. At the same time, I wanted to find out other possible directions in the research into this field and discover how the discussion about priorities of the research in the experimental community proceeds. Two international dimensions of paradigmatic approaches separated to the certain degree can be considered as relevant with regard to the global...

Page generated in 0.3611 seconds