Cost-effective experimental design to support modeling of concentration-response functions

Modeling concentration-response function became extremely popular in ecotoxicology during the last decade. Indeed, modeling allows determining the total response pattern of a given substance. However, reliable modeling is consuming in term of data, which is in contradiction with the current trend in ecotoxicology, which aims to reduce, for cost and ethical reasons, the number of data produced during an experiment. It is therefore crucial to determine experimental design in a cost-effective manner. In this paper, we propose to use the theory of locally D-optimal designs to determine the set of concentrations to be tested so that the parameters of the concentration-response function can be estimated with high precision. We illustrated this approach by determining the locally D-optimal designs to estimate the toxicity of the herbicide dinoseb on daphnids and algae. The results show that the number of concentrations to be tested is often equal to the number of parameters and often related to the their meaning, i.e. they are located close to the parameters. Furthermore, the results show that the locally D-optimal design often has the minimal number of support points and is not much sensitive to small changes in nominal values of the parameters. In order to reduce the experimental cost and the use of test organisms, especially in case of long-term studies, reliable nominal values may therefore be fixed based on prior knowledge and literature research instead of on preliminary experiments

How Much Does It Cost? Optimization of Costs in Sequence Analysis of Social Science Data

One major methodological problem in analysis of sequence data is the determination of costs from which distances between sequences are derived. Although this problem is currently not optimally dealt with in the social sciences, it has some similarity with problems that have been solved in bioinformatics for three decades. In this article, the authors propose an optimization of substitution and deletion/insertion costs based on computational methods. The authors provide an empirical way of determining costs for cases, frequent in the social sciences, in which theory does not clearly promote one cost scheme over another. Using three distinct data sets, the authors tested the distances and cluster solutions produced by the new cost scheme in comparison with solutions based on cost schemes associated with other research strategies. The proposed method performs well compared with other cost-setting strategies, while it alleviates the justification problem of cost schemes.

Does human capital stimulate investment in physical capital?: Evidence from a cost system framework

The direct effect of human capital on economic growth has been widely analysed in the economic literature. This paper, however, focuses on its indirect effect as a stimulus for private investment in physical capital. The methodological framework used is the duality theory, estimating a cost system aggregated with human capital. Empirical evidence is given for Spain for the period 1980-2000. We provide evidence on the indirect effect of human capital in making private capital investment more attractive. Among the main explanations forthis process, we observe that higher worker skill levels enable higher returns to be extracted from investment in physical capital.

Independent Central Banks: Low inflation at no cost?: A model with fiscal policy

In this article we extend the rational partisan model of Alesina and Gatti (1995) to include a second policy, fiscal policy, besides monetary policy. It is shown that, with this extension, the politically induced variance of output is not always eliminated nor reduced by delegating monetary policy to an independent and conservative central bank. Further, in flation and output stabilisation will be affected by the degree of conservativeness of the central bank and by the probability of the less in flation averse party gaining power. Keywords: rational partisan theory; fiscal policy; independent central bank JEL Classi fication: E58, E63.

Total Cost of Transportation Analysis of Road and Highway Issues, HR-388, 2002

In the administration, planning, design, and maintenance of road systems, transportation professionals often need to choose between alternatives, justify decisions, evaluate tradeoffs, determine how much to spend, set priorities, assess how well the network meets traveler needs, and communicate the basis for their actions to others. A variety of technical guidelines, tools, and methods have been developed to help with these activities. Such work aids include design criteria guidelines, design exception analysis methods, needs studies, revenue allocation schemes, regional planning guides, designation of minimum standards, sufficiency ratings, management systems, point based systems to determine eligibility for paving, functional classification, and bridge ratings. While such tools play valuable roles, they also manifest a number of deficiencies and are poorly integrated. Design guides tell what solutions MAY be used, they aren't oriented towards helping find which one SHOULD be used. Design exception methods help justify deviation from design guide requirements but omit consideration of important factors. Resource distribution is too often based on dividing up what's available rather than helping determine how much should be spent. Point systems serve well as procedural tools but are employed primarily to justify decisions that have already been made. In addition, the tools aren't very scalable: a system level method of analysis seldom works at the project level and vice versa. In conjunction with the issues cited above, the operation and financing of the road and highway system is often the subject of criticisms that raise fundamental questions: What is the best way to determine how much money should be spent on a city or a county's road network? Is the size and quality of the rural road system appropriate? Is too much or too little money spent on road work? What parts of the system should be upgraded and in what sequence? Do truckers receive a hidden subsidy from other motorists? Do transportation professions evaluate road situations from too narrow of a perspective? In considering the issues and questions the author concluded that it would be of value if one could identify and develop a new method that would overcome the shortcomings of existing methods, be scalable, be capable of being understood by the general public, and utilize a broad viewpoint. After trying out a number of concepts, it appeared that a good approach would be to view the road network as a sub-component of a much larger system that also includes vehicles, people, goods-in-transit, and all the ancillary items needed to make the system function. Highway investment decisions could then be made on the basis of how they affect the total cost of operating the total system. A concept, named the "Total Cost of Transportation" method, was then developed and tested. The concept rests on four key principles: 1) that roads are but one sub-system of a much larger 'Road Based Transportation System', 2) that the size and activity level of the overall system are determined by market forces, 3) that the sum of everything expended, consumed, given up, or permanently reserved in building the system and generating the activity that results from the market forces represents the total cost of transportation, and 4) that the economic purpose of making road improvements is to minimize that total cost. To test the practical value of the theory, a special database and spreadsheet model of Iowa's county road network was developed. This involved creating a physical model to represent the size, characteristics, activity levels, and the rates at which the activities take place, developing a companion economic cost model, then using the two in tandem to explore a variety of issues. Ultimately, the theory and model proved capable of being used in full system, partial system, single segment, project, and general design guide levels of analysis. The method appeared to be capable of remedying many of the existing work method defects and to answer society's transportation questions from a new perspective.

Value added logistical support service: logistics cost structure and performance in the new concept. Part 3

The aim of this study is to present an Activity-Based Costing spreadsheet tool for analyzing the logistics costs. The tool can be used both by customer-companies and logistics service providers. The study discusses the influence of different activity models on costs. Additionally this paper discusses about the logistical performance across the total supply chain This study is carried out using ananalytical research approach and literature material has been used for supplementing the concerned research approach. Cost structure analysis was based on the theory of activity-based management. This study was outlined to spare part logistics in machine-shop industry. The outlines of logistics services and logisticalperformance discussed in this report are based on the new logistics business concept (LMS-concept), which has been presented earlier in the Valssi-project. Oneof the aims of this study is to increase awareness of different activity modelson logistics costs. The report paints an overall picture about the business environment and requirements for the new logistics concept.

Cost information in engineering design -Potentials and limitations of activity-based costing

The purpose of this thesis is to analyse activity-based costing (ABC) and possible modified versions ofit in engineering design context. The design engineers need cost information attheir decision-making level and the cost information should also have a strong future orientation. These demands are high because traditional management accounting has concentrated on the direct actual costs of the products. However, cost accounting has progressed as ABC was introduced late 1980s and adopted widely bycompanies in the 1990s. The ABC has been a success, but it has gained also criticism. In some cases the ambitious ABC systems have become too complex to build,use and update. This study can be called an action-oriented case study with some normative features. In this thesis theoretical concepts are assessed and allowed to unfold gradually through interaction with data from three cases. The theoretical starting points are ABC and theory of engineering design process (chapter2). Concepts and research results from these theoretical approaches are summarized in two hypotheses (chapter 2.3). The hypotheses are analysed with two cases (chapter 3). After the two case analyses, the ABC part is extended to cover alsoother modern cost accounting methods, e.g. process costing and feature costing (chapter 4.1). The ideas from this second theoretical part are operationalized with the third case (chapter 4.2). The knowledge from the theory and three cases is summarized in the created framework (chapter 4.3). With the created frameworkit is possible to analyse ABC and its modifications in the engineering design context. The framework collects the factors that guide the choice of the costing method to be used in engineering design. It also illuminates the contents of various ABC-related costing methods. However, the framework needs to be further tested. On the basis of the three cases it can be said that ABC should be used cautiously when formulating cost information for engineering design. It is suitable when the manufacturing can be considered simple, or when the design engineers are not cost conscious, and in the beginning of the design process when doing adaptive or variant design. If the design engineers need cost information for the embodiment or detailed design, or if manufacturing can be considered complex, or when design engineers are cost conscious, the ABC has to be always evaluated critically.

Finnairin lentopetrolihankinnat ja niiden kehittäminen

Tutkimuksen päätavoitteena on ollut Finnair Oyj:n lentopetrolihankintojen tutkiminen ja hankintatoimen kehittäminen. Tutkimuksen pääongelmana on ollut korkea lentopetrolin hinta ja siksi tutkimus on etsinyt ratkaisuja, joiden avulla kustannuspaineita voidaan pienentää. Tutkimus on laadullinen, koska Finnairin lentopetrolihankinnat ovat muutaman henkilön vastuulla ja siten kvantitatiivisen tutkimuksen tekeminen olisi ollut vaikeaa. Empiirinen osuus on tehty henkilökohtaisina haastatteluina joko "face-to-face" -tyyppisenä tai sähköpostitse. Tutkimuksen teoreettisen osuuden sateenvarjona on ollut hankintastrategia, jonka alaisuudessa tutkimuksen muita teorioita ja malleja on käsitelty. Koska hankintastrategian osatekijöiden käyttö ja valinta vaikuttaa ratkaisevasti transaktiokustannusten esiintymiseen, on ollut järkevää katsoa syntyviä kustannuksia hankintastrategisesta näkökulmasta. Elinkaarikustannukset on otettu mukaan tutkimukseen, koska Lisa Ellramin kehittämä Total Cost of Ownership –malli implikoi voimakkaasti ostoprosessin eri vaiheisiin. Tutkimuksen tuloksena voidaan kertoa, että mitään yksiselitteistä ratkaisua korkeaa lentopetrolihintaa vastaan ei ole olemassa. Lentopetrolihankintoja voidaan kehittää, erityisesti hyödyntämällä sähköistä hankintatoimea, jossa prosesseja tehostetaan tietotekniikkaa käyttäen. Lentopetrolihankintoja voidaan tehostaa myös perinteisimmillä menetelmillä, kuten järjestelemällä uudelleen toimintoja ja fyysiseen tankkaustapahtumaan liittyviä keinoja. Hankintastrategian yhteisostot –osatekijä antaa hyvän välineen vipuvaikutuksen käyttämiseen hankinnoissa, taktisen ostamisen ohella. Toimittajasuhteiden syventämisellä ja transaktiokustannusten pienentämisellä voidaan saavuttaa kilpailuetua koko toimitusketjulle. Case –yhtiön tapauksessa tämä tarkoittaa edullisempia lentolippuja loppuasiakkaalle ja kasvavaa kysyntää Finnairille.

Monikanavaisuuden hyödyt ja haitat - tutkimus monikanavaisuudesta palveluntarjoajan ja asiakkaan näkökulmasta

Tämän tutkimuksen tavoitteena oli selvittää, voidaanko asiakkaan ja palveluntarjoajan odotukset yhdistää muodostettaessa palveluntarjoajan monikanavamallia. Monikanavaisuus tuo asiakkaalle mahdollisuuksia ajasta ja paikasta riippumattomaan asiointiin. Asiakkaan näkökulmasta tämä tarkoittaa usein sitä, että hänen oppimansa asiointitapa muuttuu. Asiakas kokee haittana sen, että joutuu panostamaan uuden asiointitavan opettelemiseen ja odottaa tämän muutoksen tuovan hänelle hyötyjä. Monikanavaisuuden hyödyt asiakkaalle punnitaan tässä muutostilanteessa. Palveluntarjoaja odottaa monikanavamallin tuovan kustannussäästöjä, sillä kanavavalinnat ovat keino kehittää asiakkuuksia ja vaikuttaa yrityksen kannattavuuteen pitkällä aikajänteellä. Monikanavamallin toteuttaminen vaatii palveluntarjoajalta alkuvaiheessa resursseja, investointeja ja halutun muutoksen tavoitteellista johtamista. Tutkittavat asiakkaat valittiin Suomen Posti Oyj:n Yritykset ja yritykset –asiakassegmentistä. Tutkimuksessa ei löytynyt asiakaskohtaisia eroja asiakkaiden odotuksista palveluntarjoajien monikanavamalleihin, mutta hyötyodotusten suhteen tunnistettiin kolme erilaista asiakastyyppiä: kustannussäästöjä odottavat hintaorientoituneet asiakkaat, palvelun entistä parempaa sujumista odottavat palveluorientoituneet asiakkaat ja oman valinnanvapautensa merkitystä painottavat asiakassuhdeorientoituneet asiakkaat. Palveluntarjoajan tulee pystyä viestimään ja argumentoimaan asiointitavan muutoksesta kullekin asiakkaalle merkityksellisellä tavalla. Teorian ja empirian pohjalta voidaan sanoa, että asiakkaan ja palveluntarjoajan odotukset voidaan yhdistää muodostettaessa palveluntarjoajan monikanavamallia. Tämä edellyttää, että palveluntarjoaja tuntee asiakkaansa niin hyvin, että tietää millaiset eri asiakkaiden hyötyodotukset ovat.

Life span and reproductive cost explain interspecific variation in the optimal onset of reproduction.

Fitness can be profoundly influenced by the age at first reproduction (AFR), but to date the AFR-fitness relationship only has been investigated intraspecifically. Here, we investigated the relationship between AFR and average lifetime reproductive success (LRS) across 34 bird species. We assessed differences in the deviation of the Optimal AFR (i.e., the species-specific AFR associated with the highest LRS) from the age at sexual maturity, considering potential effects of life history as well as social and ecological factors. Most individuals adopted the species-specific Optimal AFR and both the mean and Optimal AFR of species correlated positively with life span. Interspecific deviations of the Optimal AFR were associated with indices reflecting a change in LRS or survival as a function of AFR: a delayed AFR was beneficial in species where early AFR was associated with a decrease in subsequent survival or reproductive output. Overall, our results suggest that a delayed onset of reproduction beyond maturity is an optimal strategy explained by a long life span and costs of early reproduction. By providing the first empirical confirmations of key predictions of life-history theory across species, this study contributes to a better understanding of life-history evolution.

Does human capital stimulate investment in physical capital? Evidence from a cost system framework

The direct effect of human capital on economic growth has been widely analysed in the economic literature. This paper, however, focuses on its indirect effect as a stimulus for private investment in physical capital. The methodological framework used is the duality theory, estimating a cost system aggregated with human capital. Empirical evidence is given for Spain for the period 1980-2000. We provide evidence on the indirect effect of human capital in making private capital investment more attractive. Among the main explanations for this process, we observe that higher worker skill levels enable higher returns to be extracted from investment in physical capital.

Local privatization, intermunicipal cooperation, transaction costs and political interests: Evidence from Spain

Several empirical studies have analyzed the factors that influence local privatization. Variables related to fiscal stress, cost reduction, political processes and ideological attitudes are the most common explanatory variables used in these studies. In this paper, we add to this literature by examining the influence of transaction costs and political factors on local governments’ choices through new variables. In addition to this, we consider the role of additional aspects, such as intermunicipal cooperation as a potential alternative to privatization in order to exploit scale economies or scope economies. We consider two relevant services: solid waste collection and water distribution. Results from our estimates show that privatization (that is, contracting out to a private firm) is less common for water distribution than for solid waste collection. Higher transaction costs in water distribution are consistent with this finding. Furthermore, we find that municipalities with a conservative ruling party privatize more often regardless of the ideological orientation of the constituency. This shows that those political interests able to influence local elections are more important in determining the form of delivery than is the basic ideological stance of the constituency. Finally, we find that intermunicipal cooperation is an alternative to local privatization.

TransPromo communication as a part of company’s marketing communications when the e-bill is a medium

The goal of this thesis was to research what TransPromo is, why companies want to implement TransPromo communication, and what the elements of effective Transpromo communication are. Furthermore, the goal was to develop a TransPromo communication strategy and a normative model for TeliaSonera Finland, which depicts the elements of effective TransPromo communication when the electronic bill is a medium. Abductive reasoning was utilized in this thesis, which means that empirical and theoretical worlds are alternating in researcher’s reasoning process. This thesis didn’t rely on any specific theory nor did it utilize any previous theoretical model. However, certain theoretical connections existed so this thesis cannot be considered purely inductive. The empirical part of this thesis was conducted by examining secondary industry data and by conducting specialist interviews at TeliaSonera Finland and Strålfors. Grounded Theory approach was utilized in the analysis of the interview data and content analysis was used in the analysis of secondary industry data. This thesis increases knowledge in the area of TransPromo communication, and provides one definition of TransPromo communication. As a result of this thesis, a TransPromo communication strategy and a normative model for TeliaSonera Finland was built. The model depicts the elements of the effective TransPromo communication when the e-bill is a medium. The TranPromo communication objective is to utilize transaction documents, such as bills, in order to deliver targeted and personalized marketing messages to current customers. The aim is to strengthen the customer relationship, and to enforce up-sell and cross-sell opportunities and cost savings.

Hybrid LC Filter for Power Electronic Drives: Theory and Implementation

Power electronic converter drives use, for the sake of high efficiency, pulse-width modulation that results in sequences of high-voltage high-frequency steep-edged pulses. Such a signal contains a set of high harmonics not required for control purposes. Harmonics cause reflections in the cable between the motor and the inverter leading to faster winding insulation ageing. Bearing failures and problems with electromagnetic compatibility may also result. Electrical du/dt filters provide an effective solution to problems caused by pulse-width modulation, thereby increasing the performance and service life of the electrical machines. It is shown that RLC filters effectively decrease the reflection phenomena in the cable. Improved (simple, but effective) solutions are found for both differential- and common-mode signals; these solutions use a galvanic connection between the RLC filter star point and the converter DC link. Foil chokes and film capacitors are among the most widely used components in high-power applications. In actual applications they can be placed in different parts of the cabinet. This fact complicates the arrangement of the cabinet and decreases the reliability of the system. In addition, the inductances of connection wires may prevent filtration at high frequencies. This thesis introduces a new hybrid LC filter that uses a natural capacitance between the turns of the foil choke based on integration of an auxiliary layer into it. The main idea of the hybrid LC filter results from the fact that both the foil choke and the film capacitors have the same roll structure. Moreover, the capacitance between the turns (“intra capacitance”) of the foil inductors is the reason for the deterioration of their properties at high frequencies. It is shown that the proposed filter has a natural cancellation of the intra capacitance. A hybrid LC filter may contain two or more foil layers isolated from each other and coiled on a core. The core material can be iron or even air as in the filter considered in this work. One of the foils, called the main foil, can be placed between the inverter and the motor cable. Other ones, called auxiliary foils, may be connected in star to create differential-mode noise paths, and then coupled to the DC link midpoint to guarantee a traveling path, especially for the common-mode currents. This way, there is a remarkable capacitance between the main foil and the auxiliary foil. Investigations showed that such a system can be described by a simple equivalent LC filter in a wide range of frequencies. Because of its simple hybrid construction, the proposed LC filter can be a cost-effective and competitive solution for modern power drives. In the thesis, the application field of the proposed filter is considered and determined. The basics of hybrid LC filter design are developed further. High-frequency behaviour of the proposed filter is analysed by simulations. Finally, the thesis presents experimental data proving that the hybrid LC filter can be used for du/dt of PWM pulses and reduction of common-mode currents.

Effects of a Financial Transaction Tax - Do Transaction Costs Lower Volatility?: A Literature Review

In this literature review the theorethical framework of Financial transaction taxes and their assumed effect on market volatility is assessed. The empirical evidence from various studies is compared against the theory and a simple empirical review of the Finnish stock market is conducted. The findings implicate that financial transaction taxes can not reduce volatility and their actual effect on markets is dependend by many other factors as well. Some evidence even suggests that transactions taxes may actually raise volatility.