摘要:

AbstractThis article presents the results of a dynamic simulation study of a rural area in southern Sudan. In order to improve the living conditions of the rural population in this area, three intervention packages were planned: improved veterinary care; improved agricultural practices; and better general facilities like medical care, clean drinking water, schools, and roads. Although these interventions initially seem to benefit the rural population, some worsen the situation after a number of years when compared to the case without interventions, and others are not able to bring about a sustainable development of the area. Especially the improvement of the general infrastructure causes problems in the long run because it accelerates migration from the rural areas to the town. This increases the share of imported sorghum purchased by the town dwellers and diminishes the ability of the rural population to purchase food after a year of a low Productivity. It is concluded that analyzing the dynamics of the system can foster planning of appropriate interventions.

ISSN:0883-7066    

DOI:10.1002/sdr.4260090102

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractThis article presents a system model to analyze the solid waste disposal problem in New York State. The model shows that the solid waste system will go through a costly transition from a landfill‐dominated mode of disposal to other disposal alternatives. The solid waste budget has to rise sharply during the transition. Solid waste expenses are financed by local taxes and state financial aid. If local and state governments do not respond rapidly to higher budget requirements, illegal disposal will increase and the total cost of transition will rise. Rapid response of the local authorities to increase the solid waste budget and to lower solid waste generation per capita is necessary to manage the transition with a lower total cost and less illegal disposa

ISSN:0883-7066    

DOI:10.1002/sdr.4260090103

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractA system dynamics model reproduces a variety of national Indicator data reflecting cocaine use and supply over a 15‐year period and provides detailed estimates of actual underlying prevalence. Sensitivity testing clarifies the source of observed trends, such as growth in the compulsive use of crack cocaine and decline in the casual use of cocaine powder. Alternative scenarios with possible policy implications are simulated and projected for 12 years, and the results are assesse

ISSN:0883-7066    

DOI:10.1002/sdr.4260090104

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractNotes andInsightsis a forum for discussion and debate about current issues in the philosophy and application of the system dynamics approach, and a marketplace for the exchange of information about currant research, policy issues, and teaching experiences. Manuscripts treating material particularly suited to presentation in short form (less than 2,000 words) should be sent to Erich Zahn, Betriebswirtschaft‐liches Institut, Abt. IV, Universität Stuttgart, Keplerstr. 17, D‐7000 Stuttgart 1, Ger

ISSN:0883-7066    

DOI:10.1002/sdr.4260090105

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractThis section of the SystemDynamics Reviewis an eclectic source of information on items of interest to the system dynamics commun‐ity. Conferences, articles, books, dis‐sertations, speeches, software and hardware products, and teaching materials will be mentioned in this space. The purpose of the section is to provide summaries to help the system dynamics community keep abreast of recent progress related to the field and to anticipate important future events. Submissions covering a wide range of areas and information of possible interest to system dynamicists are encouraged and should be sent to R. Joel Rahn, Faculté des Sciences de l'Administration, Université Laval, Ste. Foy, Quebec, G1K 7P4, Canada. Fax: (418) 656‐2624. E‐mail:rahnj@vml.

ISSN:0883-7066    

DOI:10.1002/sdr.4260090106

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

ISSN:0883-7066    

DOI:10.1002/sdr.4260090107

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

ISSN:0883-7066    

DOI:10.1002/sdr.4260090108

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY

ISSN:0883-7066    

DOI:10.1002/sdr.4260090101

出版商:John Wiley&Sons, Ltd.    

年代:1993

数据来源: WILEY