Decision procedure

Douglas, J. M., A Hierarchical Decision Procedure for Process Synthesis, AIChEJ, 31 353, 1985. 

Rajagopal, S., Ng, K.M. and Douglas, J.M., 1992. A liieracliical decision procedure for the conceptual design of solids processes. Computers and Chemical Engineering, 16, 675. 

Inclusion in Annex I is the prerequisite for the mutual recognition of authorizations between Member States. At the time Directive 91/414/EEC was adopted in 1991, there were over 800 a.i. authorized for use in the Member States. The goal was to evaluate these at Community level within 12 years. However, the resources necessary to carry out this exercise were not fully recognized when the legislation was adopted. Moreover, time-consuming decision procedures delay the review process. Up to February 2002, 15 existing a.i. and 13 new a.i. were listed in Annex I, whereas 19 a.i. were rejected (see also Table 1). There is clearly a lack of mutual recognition between Member States. 

Clearly IP is itself a partially computable decision procedure. 

The existence of such a sequence would imply the existence of a partial decision procedure for " P is strongly equivalent to Q " as follows. We keep a counter with a number N and a pseudostack with up to N entries of the form CP, i) for a scheme P (or, more accurately, the description or name of a scheme) and a number... 

Heikkila et al. (1996) have expanded the work of Hurme and Jarvelainen (1995) with environmental and safety aspects (Fig. 11). The alternatives are simulated to determine the material and heat balances and to estimate the physical properties. Then the alternatives are assessed in economic terms for which the internal rate of return is used. The environmental effects are estimated by equivalent amount of pollutant that takes into consideration the harmfullness of the different effluent substances. With environmental risks are also considered aspects of occupational health to choose inherently healthier process. Even though most health related rules are considered later in the work instructions, health effects should also be a part of the decision procedure. The inherent safety is estimated in terms of the inherent safety index as described later. 

Example For an example of the use of this decision procedure, I will use DATASET D (see Appendix 1). The data set Is to be used to prepare a calibration graph in chromatographic analysis. It contains a number of excessively high values in the lower levels due to the presence of an overlapping contaminant. 

The PEG has been transformed into Paediatric Working Party in relation to implementation of Regulation (EC) No 726/2004. On 29 September 2004, the EC released the first proposal for a Regulation on Medicinal Products for Paediatric Use together with an explanatory memorandum, the Extended Impact Assessment and questions and answers document. The proposal has now been presented to the Council of Ministers and the European Parliament and it will go through the co-decision procedure. The earliest that the proposal is likely to become law is late 2006. 

The cost of each line of action depends on the cost of sampling, reworking and of shipping unsatisfactory material. If the prior distribution were not known, decision would have to be based on the sample and a minimum cost decision procedure might not be reached. 

The principle of integral process development [26] covers much more than just the optimization of a process. This approach begins with computer-aided decision procedures in the conception phase. Tools are available in which the process structure is suggested, for example should the process be a batch or a continuous operation The software tool for process synthesis PROSYN uses databases which include knowledge of experts, material data and calculation models for unit operations. Interfaces to process simulation tools such as ASPENPLUS and material databases are also supplied. PROSYN also delivers an economic evaluation of the future production process. 

Finally, a legislative strategy could be devised to deal with the issues raised by State aid law in this field. As with the current EU ETS Directive, the relevant legal basis under the EC Treaty for such legislation would be Article 175(1) EC, which would require a proposal from the Commission and the involvement and ultimate joint agreement of the Council and the European Parliament under the so-called co-decision procedure of Article 251 EC. If this is the only way in which to achieve the desired changes, it is vital that moves begin as soon as possible this process can be... 

Major decisions can and must be anticipated and prepared by both the decision makers and by those who s further work depends on the decision. The major decisions for a development project, as proposed in Table 4, should be integrated in the project plan along with the necessary tasks for their preparation. Management should provide guidance on the information needed for such decisions. Most larger companies have established routine schemes for the major project decisions and for the necessary information and prerequisites. If applied pragmatically, such schemes can shorten decision procedures considerably. 

Fig. 11. Three possible general separation structures when reactor exit is (a) liquid (b) vapor, and liquid (c) vapor only [Reproduced from Hierarchical Decision Procedure for Process Synthesis, J. M. Douglas, AIChE J., 31, 353 (1985), by permission].

Rossiter, A. P., and Douglas, J. M., Design and optimization of solids processes. Part 1. A hierarchical decision procedure for process synthesis of solids systems. Chem. Eng. Res. Des. 64, 175 (1986a). 

Douglas, J.M. A hierarchical decision procedure for process synthesis. AICHE J. 1985, 31, 353. 

The Douglas hierarchical design decision procedures for analyzing flowsheets, particularly in the design of new processes ... 

---