control and performance of international joint ventures control is a critical concept for successful management and performance of international joint ventures ijvs this paper reviews and synthesizes prior studies addressing the conceptualization and operationalization of control within ijvs as well as the ijv control performance relationship the paper also presents a new conceptualization of ijv control as well as a conceptual frame work for studying control of ijvs

optimal management of pumped hydroelectric production with state constrained optimal control abstract we present a novel technique to solve the problem of managing optimally a pumped hydroelectric storage system this technique relies on representing the system as a stochastic optimal control problem with state constraints these latter corresponding to the finite volume of the reservoirs following the recent level set approach presented in o bokanowski a picarelli h zidani state constrained stochastic optimal control problems via reachability approach siam j control and optim 54 5 2016 we transform the original constrained problem in an auxiliary unconstrained one in augmented state and control spaces obtained by introducing an exact penalization of the original state constraints the latter problem is fully treatable by classical dynamic programming arguments

optimal operation of pumped hydro storage plants with continuous time varying power prices abstract pumped hydro storage plants are increasingly considered as a complement to intermittent renewable energy sources hence a profound understanding of their underlying economics gains in importance to this end we derive efficient operation programs for storage plants which operate in an environment with time varying but deterministic power prices optimal control theory thereby provides a consistent framework for analysis in continuous time taking into account the different specifics of pumped hydro setups with large not restricting and small restricting reservoirs an empirical illustration discusses storage operation in the german market showing that the profit potential for storage plants decreased significantly between 2008 and 2011 affecting both large and small reservoir plants

estimating dynamic demand for cigarettes using panel data the effects of bootlegging taxation and advertising reconsidered abstracct a dynamic demand for cigarette consumption is estimated using pooled data of 46 states over the period 1963 to 1980 a price elasticity of 0 2 and an insignificant income elasticity is found using pooled estimation techniques the bootlegging effect is modeled explicitly using neighboring price the effect is found to be significant two major policy issues are analyzed in light of these new estimates 1 cigarette taxation is found to be an effective tool for generating revenues even though there may be spillover effects to neighboring states where bootlegging is significant 2 the effects of the fairness doctrine act and the advertising ban on cigarette consumption are re examined we find mild support for the effectiveness of subsidized anti smoking messages in reducing cigarette consumption and no support for the thesis that the ban on advertising helps to increase per capita consumption

optimal economic dispatch and risk management of thermal power plants in deregulated markets this paper presents a methodology for the valuation optimization market margin and credit risk management of gas fired power plants and associated tolling contracts term structure models for the power and gas forward curves are employed to facilitate hedging and risk adjustment and for improved forecasting of short term prices the model for the power forward curve is capable of reproducing the important phenomena often observed in power markets including spot price spikes and spike clustering negative prices and the empirically observed volatility term structures of power and gas forward prices as well as the correlation term structure between these forward curves the method solves the stochastic dynamic optimization problem that arises from the inclusion of the various operational constraints of gas fired power plants including minimum uptime and downtime requirements ramp rate restrictions and costs variable output and efficiency rates and minimum generation levels the model involves the so

on the economics of ramping rate restrictions at hydro power plants balancing profitability and environmental costs this paper examines the impact of ramping rate restrictions imposed on hydro operations to protect aquatic ecosystems a dynamic optimization model of the profit maximizing decisions of a hydro operator is solved for various restrictions on water flow using data for a representative hydro operation in ontario profits are negatively affected but for a range of restrictions the impact is not large ramping restrictions cause a redistribution of hydro production over a given day which can result in an increase in total hydro power produced this affects the need for power from other sources with consequent environmental impacts

the other half of the picture antecedents of spouse cross cultural adjustment scholars have argued that the adjustment of the expatriate s spouse is an important factor in the success or failure of expatriates in overseas assignments however they have not empirically examined which factors are related to spouse adjustment this study is the first to systematically examine the antecedents of spouse cross cultural adjustment to interacting with host country nationals and to coping with the general foreign environment the results indicate that firms seeking the spouse s opinion about the international assignment the spouse s self initiated predeparture training and social support from family and host country nationals during the overseas assignment have a positive relationship with spouse interaction adjustment additionally firms seeking the spouse s opinion about the international assignment and standard of living have a positive relationship with spouse general adjustment while firm provided training and culture novelty have negative relationships with spouse general adjustment several important research and practical implications are explored

a needs driven approach to expatriate adjustment and career development a multiple mentoring perspective although effective in improving socialization development and retention in the us domestic context mentoring would likely benefit expatriates and their firms but it remains theoretically underdeveloped in the international context we develop a theory of international mentoring by integrating current perspectives on protean and boundaryless careers with the literature on mentoring and expatriates expatriates need multiple mentors to assist their adjustment and development during the pre departure expatriation and repatriation stages of international assignments we discuss both hierarchical and peer and formal and informal mentoring relationships to delineate which relationships best address specific expatriate needs international mentoring may improve expatriate adjustment development and retention and thus may affect outcomes of international strategy we conclude by discussing implications and avenues for future research

incorporating fuel constraints and electricity spot prices into the stochastic unit commitment problem the electric power industry is going through deregulation as a result the load on the generating units of a utility is becoming increasingly unpredictable furthermore electric utilities may need to buy power or sell their production to a power pool that serves as a spot market for electricity these trading activities expose utilities to volatile electricity prices in this paper we present a stochastic model for the unit commitment that incorporates power trading into the picture our model also accounts for fuel constraints and prices that may vary with electricity prices and demand the resulting model is a mixed integer program that is solved using lagrangian relaxation and bender s decomposition using this solution approach we solve problems with 729 demand scenarios on a single processor to within 0 1 of the optimal solution in less than 10 minutes our numerical results indicate that significant savings can be achieved when the spot market is entered into the problem and when stochastic policy is adopted instead of a deterministic one

valuation and optimal operation of electric power plants in competitive markets we present an algorithm for the valuation and optimal operation of hydroelectric and thermal power generators in deregulated electricity markets real options theory is used to derive nonlinear partial integro differential equations pides for the valuation and optimal operating strategies of both types of facilities the equations are designed to incorporate a wide class of spot price models that can exhibit the same time dependent mean reverting dynamics and price spikes as those observed in most electricity markets particular attention is paid to the operational characteristics of real power generators for thermal power plants these characteristics include variable start up times and costs control response time lags minimum generating levels nonlinear output functions and structural limitations on ramp rates for hydroelectric units head effects and environmental constraints are addressed we illustrate the models with numerical examples of a pump storage facility and a thermal power plant this pide framework can achieve high levels of computational speed and accuracy while incorporating a wide range of spot price dynamics and operational characteristics

optimization of pumped storage capacity in an isolated power system with large renewable penetration this work describes an economic analysis of the inclusion of pumped storage in a small island system that has abundant renewable energy available but that at times cannot accept all of this power because of limits imposed by security criteria the question of whether or how much pumped storage to include is addressed by formulating a linear programming optimization problem the stochastic nature of load and renewable production is addressed using scenarios developed through fuzzy clustering both the unit capacity in mw and the reservoir storage capacity in mwh are optimized and optimal operating strategies for the scenarios are produced results showed that including pumped storage can be an effective means of allowing larger penetration of intermittent renewable energy sources improving both the dynamic security and the economic operation of a test system including the dynamic security criteria in the economic question of dimensioning the pumped storage unit proved to make a significant difference in the optimal pumped storage capacity

the fleeting effect of advertising abstract this paper adds to the evidence that advertising effects depreciate rapidly inclusion of lagged advertising in empirical models may be unnecessary in addition the notion that accumulated advertising effects may be a barrier to entry is called into question

dual career expatriates expectations adjustment and satisfaction with international relocation dual career expatriate couples present a challenging set of problems for international human resource managers the results of a survey of husbands and wives in expatriate dual career couples are analyzed relative to 1 differences between the expatriates and their trailing spouses 2 differences between male and female led dual career couples 3 differences between dual career couples opinions prior to expatriation and upon repatriation the results of the study indicate dual career couples have relatively consistent concerns and expectations prior to expatriation and upon repatriation to their home country the significant differences observed were between male led dual career couples prior to expatriation when compared to male led dual career couples upon repatriation in addition the dual career expatriate respondents did not feel the mnc that transferred them overseas provided adequate training or social support during the international assignment

dimensions determinants and differences in the expatriate adjustment process we comprehensively test the black mendenhall and oddou 1991 model of the dimensions and determinants of adjustment to international assignments we also expand the model to examine two individual factors i e previous assignments and language fluency and three positional factors i e hierarchical level functional area and assignment vector as moderators of adjustment determinants surveys were completed by 452 expatriates from 29 different countries assigned to 45 host countries by large multinational firms the multi dimensionality of adjustment was investigated and confirmed support for the expanded black et al 1991 model was found several significant moderating effects emerged showing different patterns of adjustment for those with different amounts of previous expatriate experience and levels of host country language fluency hierarchical level and assignment vector were also important moderators but the effects for functional area were generally weak

the impact of electricity storage on wholesale electricity prices this paper analyzes the impact of electricity storage on the production cost of a power system and the marginal cost of electricity electricity price using a unit commitment model also real world data has been analyzed to verify the effect of storage operation on the electricity price using econometric techniques the unit commitment model found that the deployment of a storage system reduces the fuel cost of the power system but increases the average electricity price through its effect on the power system operation however the reduction in the production cost was found to be less than the increase in the consumer s cost of electricity resulting in a net increase in costs due to storage different storage and co2 price scenarios were investigated to study the sensitivity of these results the regression analysis supports the unit commitment results and finds that the presence of storage increases average wholesale electricity prices for the case study system

empirical evidence of recurring international compensation problems the expansion of international business necessitates an increased number of employees based in foreign markets these expatriates nationals and third country nationals represent unique and complex compensation problems this article addresses five of the recurring compensation problems reported by members of the society for human resource management international shrmi in a recent survey

the length of the effect of aggregate advertising on aggregate consumption abstract we investigate the longevity of aggregate advertising effects on aggregate consumption over the period 1947 1988 using updated methods the effects appear to linger for nine years raising further questions perhaps a return to this near dormant area of research could be productive

fast food restaurant advertising on television and its influence on childhood obesity childhood obesity is an escalating problem around the world that is especially detrimental as its effects carry on into adulthood to estimate the effects of television fast food restaurant advertising on children and adolescents with respect to being overweight this paper employs the 1979 child young adult national longitudinal survey of youth and the 1997 national longitudinal survey of youth to estimate the effects of television fast food restaurant advertising on children and adolescents with respect to being overweight a ban on these advertisements would reduce the number of overweight children ages 3 11 in a fixed population by 18 percent and would reduce the number of overweight adolescents ages 12 18 by 14 percent the elimination of the tax deductibility of this type of advertising would produce smaller declines of between 5 and 7 percent in these outcomes but would impose lower costs on children and adults who consume fast food in moderation because positive information about restaurants that supply this type of food would not be completely banned from television

valuation of power plants abstract in this paper we develop continuous time stochastic control models for valuation and operation of three stylised types of power plants in an electricity market a renewable plant a conventional plant and a storage plant examples of these types of power plants are respectively wind turbines gas fired generation units and hydroelectric facilities we demonstrate how to derive analytical or quasi analytical solutions in spite of many details in modeling in particular we model uncertainty in electricity prices and in production input output when it is relevant for the technology considered input output is assumed to follow a diffusion process whereas the price process may include jumps our models account for special characteristics of the technologies including a non normal distribution of wind speeds as well as start up and shut down costs of thermal units we use our models to assess the impact of conjectured future market conditions such as increasing average price level price volatility and correlation between renewable production and electricity prices

individual organizational work and environmental influences on expatriate turnover tendencies an empirical study foreign postings for executives are costly undertakings for multinational corporations especially when they fail yet little research has been done on the causes of expatriate turnover this 155 expatriate survey assesses individual organizational work and environmental influences on both internal and external turnover tendencies it was found that job autonomy and material life satisfaction were key predictors for both internal and external turnover tendencies only for organizational turnover did job autonomy supersede material life satisfaction as the lead predictor of turnover tendencies american expatriates attach much importance to maintaining living standards in postings to foreign locations

short term generation asset valuation a real options approach this paper discusses using real options to value power plants with unit commitment constraints over a short term period we formulate the problem as a multistage stochastic problem and propose a solution procedure that integrates forward moving monte carlo simulation with backward moving dynamic programming we assume that the power plant operator maximizes expected profit by deciding in each hour whether or not to run the unit that a certain lead time for commitment and decommitment decisions is necessary to start up and shut down a unit and that these commitment decisions once made are subject to physical constraints such as minimum uptime and downtime we also account for the costs associated with starting up and shutting down a unit last we assume that there are hourly markets for both electricity and the fuel used by the generator and that their prices follow ito processes using numerical simulation we show that failure to consider physical constraints may significantly overvalue a power plant

an options pricing approach to ramping rate restrictions at hydro power plants this paper investigates the impact of ramping rate restrictions imposed on hydro operations to protect aquatic ecosystems the optimal ramping decision is specified as an optimal control problem which results in a hamilton jacobi bellman hjb equation electricity prices are modelled as a regime switching stochastic process the optimal control is determined by solving the hjb equation numerically using a fully implicit finite difference approach with semi lagrangian time stepping the paper focuses on the effect of ramping restrictions on a hydro plant s value and optimal operations and provides an analysis of which factors cause ramping restrictions to have a greater or lesser impact on profitability it is shown that hydro plant value is negatively affected by ramping restrictions but the extent of the impact depends on key parameters which determine the desirability of frequent changes in water release rates interestingly for the case considered value is not sensitive to ramping restrictions over a large range of restrictions the results point to the importance of accurately modelling electricity prices in gauging the trade offs involved in imposing restrictions on hydro operators which may hinder their ability to respond to volatile electricity prices and meet peak demands

renewable energy investments under different support schemes a real options approach abstract this paper adopts a real options approach to analyze investment timing and capacity choice for renewable energy projects under different support schemes the main purpose is to examine investment behavior under the most extensively employed support schemes namely feed in tariffs and renewable energy certificate trading we consider both multiple sources of uncertainty under each support scheme and uncertainty with respect to any change of support scheme and we obtain both analytical when possible and numerical solutions in a nordic case study based on wind power we find that the feed in tariff encourages earlier investment nevertheless as investment has been undertaken renewable energy certificate trading creates incentives for larger projects in our baseline scenario and taking the fixed feed in tariff as a base the revenue required to trigger investments is 61 higher with renewable certificates at the same time investment capacity is 61 higher

on transition probabilities of regime switching in electricity prices we analyze the transition probabilities of regime switching in electricity prices by explicitly incorporating the underlying demand supply structure we show that the transition probabilities of electricity prices cannot be constant and depend on both the current demand level relative to the supply capacity and the trends of demand fluctuation these results not only contrast with the assumption of constant transition probabilities on which many regime switching models are built but also provide new insights on the determinants of the state dependent transition probabilities of regime switching

expatriation repatriation and domestic geographical relocation an empirical investigation of adjustment to new job assignments this research examines the relative impact of six sets of factors on multiple indices of adjustment to new job assignments these six sets of factors include demographic variables indices of the internationalness of the job change e g whether the job changer is an expatriate repatriate or domestic geographical relocator job characteristics variables types and amount of career development assistance degree of change between successive job assignments and types of individual coping strategies employed by job changers data were collected from 459 job changers from twenty six countries the results highlight both the commonalities among expatriates repatriates and domestic geographical relocators in adjusting to new job assignments as well as the differences among them

an empirical analysis of dynamic nonprice competition in an oligopolistic industry this article develops a dynamic model of nonprice competition in an oligopolistic industry and uses it to analyze advertising competition in the u s cigarette industry the model generalizes existing studies by allowing advertising to affect both firm market shares and the total size of the market the model also allows dynamic conjectural variations to arise from the intertemporal links created by the durability of advertising we use these dynamic conjectural variations to distinguish alternative models of competitive interaction we estimate the complete model of firm production demand and advertising choice by using data for u s cigarette producers the results indicate that firm advertising primarily affects the level of market demand with a firm s effect on rival firms market shares arising through variations in the number of brands sold empirical results on firm behavior suggest that firms act as if their advertising choices will alter the future advertising choices of rival firms in both the high tar and low tar cigarette markets

optimal management and sizing of energy storage under dynamic pricing for the efficient integration of renewable energy we address the optimal energy storage management and sizing problem in the presence of renewable energy and dynamic pricing associated with electricity from the grid we formulate the problem as a stochastic dynamic program that aims to minimize the long run average cost of electricity used and investment in storage if any while satisfying all the demand we model storage with ramp constraints conversion losses dissipation losses and an investment cost we prove the existence of an optimal storage management policy under mild assumptions and show that it has a dual threshold structure under this policy we derive structural results which indicate that the marginal value from storage decreases with its size and that the optimal storage size can be computed efficiently we prove a rather surprising result as we characterize the maximum value of storage under constant prices and i i d net demand processes if the storage is a profitable investment then the ratio of the amortized cost of storage to the constant price is less than 1 4 we further perform sensitivity analysis on the size of optimal storage and its gain via a case study finally with a computational study on real data we demonstrate significant savings with energy storage

repatriation of corporate executives an empirical study the effective management of corporate executives returning from foreign assignments has received little attention from academic researchers this study is based on questionnaires completed by members of the american society of personnel administration international aspi the focus of the study was directed at problems that occurred in repatriating executives programs used by corporations to repatriate returning executives and examines why programs have not been instituted by multinational corporations

a hybrid system econometric model for electricity spot prices considering spike sensitivity to forced outage distributions with the current trend in deregulation all electricity markets have been subject to volatile electricity prices typically in peak season as markets mature new financial and operational risk management instruments are becoming available in order to price such instruments a model for the underlying price process is required in this paper a hybrid model is described that contains aspects of the power system as well as the historical time series of spot prices observed in the market by including both aspects of the problem a model with both economic and system based aspects is created its modular design allows easy adaptation to different markets based on generating system reliability load patterns and price histories the spot price histories are manifest in two probability distributions for these prices whereas the system specifics are included via load and generation models which are calibrated to the climate and system of interest

pumped storage project a short to long term investment analysis including climate change abstract new renewable energy needs flexibility which can be provided by storage hydropower climate change affects the potential of this technology in both a negative and a positive way on one hand by altering runoff and on the other hand by creating new investment opportunity this paper provides an economic and financial analysis of a future project in a pumped storage facility that may be initiated in the swiss alps following the glacier retreat the area released may be considered for building a new reservoir a complete and integrated model is developed based on the tools of analysis provided by econometrics finance and operational research the results show that under the present market conditions such an investment is not profitable unexpectedly the sensitivity analysis shows that most of the time higher price volatility reduces annual revenue furthermore the project s lifetime only has a marginal impact on the net present value the value of the concession which is the right to use water is also assessed on the basis of a real option analysis including a long term horizon its present value is substantial even if the project is currently unprofitable in the discussion we go beyond the swiss case study and highlight the implications for energy policy and market design

spatial dependencies of wind power and interrelations with spot price dynamics abstract wind power has seen strong growth over the last decade and increasingly affects electricity spot prices in particular prices are more volatile due to the stochastic nature of wind such that more generation of wind energy yields lower prices therefore it is important to assess the value of wind power at different locations not only for an investor but for the electricity system as a whole in this paper we develop a stochastic simulation model that captures the full spatial dependence structure of wind power by using copulas incorporated into a supply and demand based model for the electricity spot price this model is calibrated with german data we find that the specific location of a turbine i e its spatial dependence with respect to the aggregated wind power in the system is of high relevance for its value many of the locations analyzed show an upper tail dependence that adversely impacts the market value therefore a model that assumes a linear dependence structure would systematically overestimate the market value of wind power in many cases this effect becomes more important for increasing levels of wind power penetration and may render the large scale integration into markets more difficult

optimal energy commitments with storage and intermittent supply we formulate and solve the problem of making advance energy commitments for wind farms in the presence of a storage device with conversion losses mean reverting price process and an autoregressive energy generation process from wind we derive an optimal commitment policy under the assumption that wind energy is uniformly distributed then the stationary distribution of the storage level corresponding to the optimal policy is obtained from which the economic value of the storage as the relative increase in the expected revenue due to the existence of storage is obtained

entry into the electricity market uncertainty competition and mothballing options the present paper analyzes the entry strategies into the electricity market of two firms that have power plants under price uncertainty and competition we consider the symmetric and asymmetric two firms which have either a thermal power plant or a nuclear power plant the differences between the thermal power plant and the nuclear power plant such as the cost structure and operational flexibility are modeled the threshold values of market entry are calculated for each firm with either the thermal power plant or the nuclear power plant as the leader or the follower we show the dependence of cost structures on entry thresholds of the leader and the follower into the electricity market for various market and cost conditions the diagrams of the leader are also shown

a real option based simulation model to evaluate investments in pump storage plants investments in pump storage plants are expected to grow especially due to their ability to store an excess of supply from wind power plants in order to evaluate these investments correctly the peculiarities of pump storage plants and the characteristics of liberalized power markets have to be considered the main characteristics of power markets are the strong power price volatility and the occurrence of prices spikes in this article a valuation model is developed capturing these aspects using power price simulation optimization of unit commitment and capital market theory this valuation model is able to value a future price based unit commitment planning that corresponds to future scope of actions also called real options the resulting real option value for the pump storage plant is compared with the traditional net present value approach because this approach is not able to evaluate scope of actions correctly it results in strongly smaller investment values and forces wrong investment decisions

a discrete model for optimal operation of fossil fuel generators of electricity abstract this paper presents a new discrete approach to the price based dynamic economic dispatch pbded problem of fossil fuel generators of electricity the objective is to find a sequence of generator temperatures that maximizes profit over a fixed length time horizon the generic optimization model presented in this paper can be applied to automatic operation of fossil fuel generators or to prepare market bids and it works with various price forecasts the model s practical applications are demonstrated by the results of simulation experiments involving 2009 nyiso electricity market data branch and bound and tabu search optimization techniques

evaluating replacement project of nuclear power plants under uncertainty this paper investigates the valuation of a replacement project of nuclear power plants under the deregulated electricity market the replacement project consists of two components the decision to decommission an existing plant and the decision to construct a new plant in the replacement project the decommissioning decision should be made considering not only the profitability of the existing plant but also the profitability and costs of the construction of the new plant real options theory is used to determine the optimal timing of the decommissioning and construction in order to examine the effect of decommissioning time and decision making one we consider a time lag for these decision making times we show the dependence of the replacement project value on uncertainty and time lag

advertising in consumer goods industries durability economies of scale and heterogeneity hree prominent explanations can be offered for the large and persistent recorded profit rates of firms in heavily advertised consumer goods industries these explanations are based on durability scale economies and heterogeneity for advertising respectively the first explanation posits a prolonged durability for advertising as a consequence recorded profit rates are overstated because accounting convention expenses advertising rather than properly treating it as an investment in durable assets 2 when the durability of advertising is sufficiently prolonged normal returns on the unreported advertising assets fully account for apparent windfall profits a second explanation rests on the presumed collusion