(2) New concepts such as "unascertained characteristic", "unascertained information" are introduced into the risk assessment for the first time, indicating that the unascertained characteristic caused by subjective uncertainty influences the veracity of risk assessment.

Quantizing method for grade of target threat for missile position, target type space, quantizing parameters space and its matrix were defined, and the unascertained measurement model was constructed.

The main achievements of this thesis are as follows:(1) Studies the existed literatures home and abroad widely on risk assessment , the intension and extension about the five categories of uncertainty ( randomicity, fuzzy characteristic, gray characteristic, unascertained characteristic, universal gray characteristic).

Among the 33 deaths, 17 (52%) were certified from a heroin/methadone or opiate overdose, 4 (12%) from drug misuse, 4 (12%) unascertained, and 8 (24%) unrelated to acute toxic effects of drug use.

Second, the unascertained measure was defined and credible identification was set up.

First, the basic knowledge of the unascertained sets was introduced briefly.

Therefore, a mathematical tool, the unascertained measure, was introduced.

Safety assessment of platform loadout procedures based on unascertained measures

Based on the unascertained mathematical theory and with electronic countermeasures taken into consideration, a study is made on the evaluation index system and measuring methods, and on how to make identification and sequencing. An evaluation model of jamming effect on radar is set up based on the unascertained effect measurement. The model has been employed in the analysis of a case of active jamming and has been proved successful. This model is perfect, and the evaluating result is reasonable,...

Based on the unascertained mathematical theory and with electronic countermeasures taken into consideration, a study is made on the evaluation index system and measuring methods, and on how to make identification and sequencing. An evaluation model of jamming effect on radar is set up based on the unascertained effect measurement. The model has been employed in the analysis of a case of active jamming and has been proved successful. This model is perfect, and the evaluating result is reasonable, with a high resolving power. It is suitable for evaluating the jamming effect on radar.\;

The assessment of the extent of threat from an air raiding target, as one of the central problems in the decision of air defence command, involves many uncertain factors and some other qualitative factors which are hard to determine in guantity. These problems reflect uncertainty, or unascertainment of the decision-maker in his subjective thinking. Although the air raiding target has its definite task, the information available is not enough for the decision-maker to determine its intention and extent of threat...

The assessment of the extent of threat from an air raiding target, as one of the central problems in the decision of air defence command, involves many uncertain factors and some other qualitative factors which are hard to determine in guantity. These problems reflect uncertainty, or unascertainment of the decision-maker in his subjective thinking. Although the air raiding target has its definite task, the information available is not enough for the decision-maker to determine its intention and extent of threat to our defence points. By applying the unascertained measurement theory, the unascertained measurement functions conforming to non-negativity-normalization and additivity are presented. On this basis, a model of assessment sequence is set up to more precisely make out the extent of threat from assessed air target. The model is reasonable in design, high in resolving power, simple but precise effective in calculation. At the end, the model is successfully applied to the assessment of an air situation.

Quantizing method for grade of target threat for missile position, target type space, quantizing parameters space and its matrix were defined, and the unascertained measurement model was constructed. The measurement function was established by defining single parameter unascertained measurement matrix. The rules of measurement function for grade of target threat were established, evaluate matrix was defined to obtain multi-parameters unascertained measurement. Then, the judging matrix was established...

Quantizing method for grade of target threat for missile position, target type space, quantizing parameters space and its matrix were defined, and the unascertained measurement model was constructed. The measurement function was established by defining single parameter unascertained measurement matrix. The rules of measurement function for grade of target threat were established, evaluate matrix was defined to obtain multi-parameters unascertained measurement. Then, the judging matrix was established to weight coefficients of status quantizing parameters. At last, the grade of target threat was obtained by unitary processing according to max.