Application of Certainty Factor Method For Diagnosis Expert System Skin Diseases In Humans

- Dental disease is one of the many health problems Complained of by the people of Indonesia. Dental health is a reflection of human health. Lack of knowledge and limited sources of information on oral health have the caused public awareness to maintain oral and dental health is still low .. The development of one of the fields of information technology namely artificial intelligence has been Widely applied in various fields of life. In this study, the dental and oral disease expert system uses the Dempster Shafer method to control inferences that Contain thought patterns and reasoning mechanisms used by experts in solving problems.


Introduction
Based on the knowledge and technological development in today's increasingly sophisticated and often called expert system. Then the skin disease patients can easily and quickly determine the type of skin disease based on symptoms experienced without investigation took so long.
The solution to this problem is to analyze, design and implement an expert system application that can perform skin disease diagnosis based on symptoms suffered.

Understanding Expert System
An expert system is a computer system that is intended to mimic all aspects (emulates) the ability of decision-making (decision making) an expert or knowledge that was loaded into an expert system. Expert systems optimally utilize specialized knowledge should an expert to solve the problem. Terms of expert systems (expert systems), often synonymous with knowledge-based systems (knowledge-based system) or knowledgebased expert systems (knowledge based expert systems) (Rossnelly, 2015: 2)

Certainty Factor Method
One theory could be used to solve the problem of the uncertainty of certainty factor or CF is a value for the confidence measure introduced by a CF specialist in the manufacture Buchanan Shortliffe MYCIN expert system to indicate the magnitude of the trust. In Andriani (2017) CF indicate the size of the certainty of the fact or rule highest score in CF is certainly true +1.0 (Definitely not) and the lowest value in the CF is -1.0 definitely wrong, positive value represents a degree of confidence, while the value of negative represents the degree of uncertainty, certainty Factor defined as follows:

Skin
Skin disease is a change in the skin that is caused by bacteria, parasites, viruses, fungi and infection that can hit from a variety of ages. This disease can also attack the whole or any part of the body concerned and can endanger the state of health of people with the disease if not treated quickly or serious. Due to several factors causing skin irritation is often the case, for example climate, unhealthy living habits, allergies, living environment is not clean, and so forth. Dyan Dyanmita daughter, M.Tanzil Furqan, and Rizal Setya Prime (2018).

Analysis
The method used by the researchers in the study certainty factor system implementation methods for expert systems to diagnose skin diseases in humans are: a. Interview b. Study of literature   -Leather chipped head G32

Conclusion
a. An expert system to diagnose skin disease in humans in this study is to analyze the data by using the method of Certainty Factor to determine the level of certainty of a disease eg Atopic eczema, Eczema contact, Eczema seberoik and others based on the data of symptoms such as rash watery, itchy and scaly skin which has been selected, then the data in the process, then the output is in the form of a solution based on the symptoms of the disease. b. Applying the method of Certainty Factor in diagnosing skin diseases in humans by step method of Certainty Factor to enter the symptoms of the disease and the type of disease, input the MB dam MD, the establishment of the rule, the method perhitungsn Certainty Factor and output produce calculation results and diagnosis. c. Designing and building an expert system that can be used to diagnose skin diseases in humans by implementing the method of Certainty Factor is by designing a Unified Modeling Language (UML) diantarnya usecase diagrams, activity diagrams, class diagrams and build systems using PHP and MySQL as the database , 6. Reference