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排序方式: 共有76条查询结果,搜索用时 15 毫秒
1.
This paper presents an analytical approach to the tactical question: ‘What level of enforcement over time allows one to eliminate a street market for illicit drugs while expanding the least possible total effort?’ The analysis is done in the context of Caulkins' model [6] which predicts the rate of change of dealers as a function of enforcement level and several market parameters. Our analysis suggests that the simple strategy of using the maximum available enforcement intensity until the market has been eliminated minimizes the total enforcement effort required. 相似文献
2.
This paper develops a sequential decision-making model for assisting law enforcement officials in allocating resources during a crackdown operation on illicit drug markets. The sequential crackdown model (SCM) considers a probabilistic framework, where the probability of incarceration of a dealer and the probability of dealing are modeled as a function of the size of a drug market, crackdown enforcement level, drug dealer's financial hardship, and other market characteristics.The model was developed and tested in consultation with enforcement officials from Philadelphia, PA and Camden, NJ. We present a detailed, step-by-step implementation scheme for updating parameters on each day of the crackdown. Parameter estimation along with examples of model usage is provided. Through these examples, we illustrate how the SCM could be helpful in understanding the response of illicit drug markets to various enforcement strategies. We further show conditions under which an alternating crackdown policy (referred to as a crackdown-backoff) or a consistent use of maximum possible enforcement would be optimal strategies for managing a drug crackdown operation. Within the context of the model and parameter estimates, we show that a much quicker and less costly collapse could be implemented if the available enforcement resources are increased. Finally, the model provides possible conditions under which a crackdown operation would be unsuccessful in eliminating a drug market. 相似文献
3.
Alok K. Chakrabarti 《Technovation》1984,2(4):255-275
This paper explores the critical factors which affect the innovation proccess. Some ways in which some of these factors can be influenced by appropriate policy measures are discussed. In particular, the role of the federal government in promoting innovation is discussed.The role of the government in stimulating and nurturing the innovation process is a controversial one. Proponents of the free enterprise system, many of whom are spokespersons for various industries, have persistently pointed out the deleterious effects of regulation and control on the innovation process. By contrast, advocates of an activist government role are often able to cite the protection of the common welfare as a primary need for government intervention. In truth, the “government” is a patchwork of many governments, operating through many agencies and affecting firms and individuals at several levels and leverage points. The same regulation that has deleterious effects on Industry A may be a stimulus for innovation in Industry B. Even in Industry A, the regulation may act as a force in directing efforts toward certain types of R&D programs that would not otherwise be undertaken.In this paper we examine the specific instances where innovation projects, both product or process types, were affected by government regulation. We also briefly review the critical factors which affect the innovation process and how various governments in industrialized countries have taken actions to influence these factors. Finally, we examine some general guidelines for policymaking purposes. 相似文献
4.
Alok K. Chakrabarti Ursula Weisenfeld 《Technology Analysis & Strategic Management》2013,25(4):357-367
This pape reports on a survey of 64 biotechnology firms in the USA about their R&D strategy, marketing focud and sources of technology. The survey explored the interrelationships among the strategic issues and how they were related with the means of appropriating R&D results. Three stralegic clusters for technology acquisitin emerged from the data: (i) internal developer, (ii) joint developer, and (iii) cooperative financed. Three marketing clusters were: (i) market penetartor, (ii) innovative marketer, and (iii) market developer. The R&D clusters were: (i) defensive strategy, (ii) aggressive strategy, and (iii) research-intensive strategy. External sources of technology appeared to be predominant among thje various firms and apparently marketing strategy and source of technology had no significant relationship. Most of the firms were involved with commercial innovation in their R&D strategy and few were research specialists. Innovative firms were inclined to depend on external sources sources of technology. Issues related to appropriability of R&D results for the different groups have been examined for their implications for public policy. 相似文献
5.
Speeding Up the Pace of New Product Development 总被引:3,自引:0,他引:3
This study empirically investigates a wide array of factors that have been argued to differentiate fast from slow innovation processes from the perspective of the research and development organization. We test the effects of strategic orientation (criteria- and scope-related variables) and organizational capability (staffing- and structuring-related variables) on the speed of 75 new product development projects from ten large firms in several industries. Backward-elimination regression analysis revealed that (a) clear time-goals, longer tenure among team members, and parallel development increased speed, whereas (b) design for manufacturability, frequent product testing, and computer-aided design systems decreased speed. However, when projects were sorted by magnitude of change, different factors were found to influence the speed of radical and incremental projects. Moreover, some factors that sped up radical innovation (e.g., concept clarity, champion presence, co-location) were found to slow down incremental innovation. Together, the radical and incremental models explain differences in speed better than the general model. This suggests a contingency approach to speeding up innovation. Implications for researchers and managers are discussed. 相似文献
6.
Firm and industry characteristics influencing publications of scientists in large American companies
This study examines the relationship between the volume of scientific and technical publications (papers) produced by industrial scientists, and the characteristics of the corporations in which they work. Specifically, the study examines 1. the relationship between several key financial characteristics of U. S. industrial firms and the production of scientific papers; 2. the relationship between the amount of scientific papers published by industrial scientists and the publication of patents; 3. the relationship between the quality of the scientists employed by U. S. industrial firms and the firms' output of papers and patents. Data from 225 U. S. corporations were collected for the years 1975 through 1983. The corporations chosen for the study all have a history of consistent R and D expenditure. There is a substantial correlation between patenting and the publication of scientific papers although controlling for the size of the corporation reduces the correlation. Large firms, as measured by their annual sales, produce proportionately fewer scientific papers than do small firms. The number of elite scientists in a corporation is more highly correlated with the publication of scientific papers than with patenting. 相似文献
7.
This article will focus mainly on utility electric plant maintenance with particular emphasis on steam (nonnuclear) turbine-generator maintenance. Our objective has been to identify and examine relationships between the target market and other recorded key operating parameters that would be useful for future forecasting of trends in the target market. 相似文献
8.
This paper modeled the effects of firms’ fundamentals such as total assets and long-term debt and of macroeconomic variables such as unemployment and interest rates on quarterly stock prices of over 3000 US firms in the period 2000–07. The merged CRSP/Compustat database was augmented by macroeconomic variables and comprehensive dynamic models were estimated by maximum likelihood taking into account heterogeneity across firms. Likelihood ratio statistics were developed for sequentially testing hypotheses regarding the adequacy of macroeconomic variables in the models. The main findings were that the estimated coefficients of lagged stock prices in simple dynamic random effects models were in the interval 0.90–0.95. Second, comprehensive dynamic models for stock prices showed that the firms’ earnings per share, total assets, long-term debt, dividends per share, and unemployment and interest rates were significant predictors; there were significant interactions between firms’ long-term debt and interest rates. Finally, implications of the results for corporate policies are discussed. 相似文献
9.
Persistent real exchange rates 总被引:1,自引:0,他引:1
Alok Johri 《Journal of International Economics》2008,76(2):223-236
Three well known facts that characterize exchange rate data are: (a) the high correlation between bilateral nominal and real exchange rates; (b) the high degree of persistence in real exchange rate movements; and (c) the high volatility of real exchange rates. This paper attempts a joint, albeit partial, rationalization of these facts in an environment with no staggered contracts and where prices are preset for only one quarter. There are two key innovations in the paper. First, we augment a standard two-country open economy model with learning-by-doing in production at the firm level. This induces monopolistically competitive firms to endogeneize the productivity effect of their price setting behavior. Specifically, firms endogenously choose not to adjust prices by the full proportion of a positive monetary shock in order to take advantage of the productivity benefits of higher production. Second, we introduce habits in leisure. This makes the labor supply decision dynamic and adds an additional source of propagation. We show that the calibrated model can quantitatively reproduce significant fractions of the aforementioned facts. Moreover, as in the data, the model also produces a positive correlation between the terms of trade and the nominal exchange rate. 相似文献
10.
We examine transaction governance in the context of concurrent sourcing, where a manufacturer relies on sourcing from external suppliers and in‐house production simultaneously. Our focus is on (1) a buyer's use of particular safeguards or governance mechanisms vis‐à‐vis an external supplier and (2) how the effects of these mechanisms on various performance outcomes are influenced by the joint presence of an internal manufacturing branch. We conduct two studies in the apparel industry and show that performance outcomes are a joint function of (1) the individual governance mechanisms that are deployed in a particular relationship and (2) the larger sourcing context (concurrent or singular). Copyright © 2013 John Wiley & Sons, Ltd. 相似文献