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This research aims to develop a web-based expert system with the Forward Chaining method that can diagnose and provide treatment for people with stroke disease. The expert system will be used to help the diagnosis process by analyzing the symptoms reported by the patient. The Forward Chaining method will be used as an inference approach in this expert system. The system will use a knowledge base that contains medical rules obtained from experts. The inference process will be carried out by linking the symptoms reported by the patient with the information in the knowledge base to determine possible diagnoses and appropriate treatments. This expert system will be implemented in the form of a web-based application that can be accessed by the general public. The results of this study show that the expert system to diagnose and provide treatment using the forward chaining method is successfully built and the application can be used to help the general public diagnose by entering the symptoms felt and the expert system will provide diagnostic results and provide treatment.

An expert system is a computer program that imitates the decision-making abilities of an expert in a particular field. This system uses a knowledge base and logical rules to analyze problems and provide solutions or recommendations, helping users who do not have in-depth knowledge of the topic, then along with the development of website-based information technology which can make it easier to identify student interests, talents, especially grades 4 and 5 carried out by the teacher, this includes the potential of each individual student according to their category so as to provide an accurate solution. The aim of this research is that an application of an expert system for identification of talent interests for users is needed which supports the teacher analysis process using certainty factors, based on certainty factors which have a concept based on symptoms and diagnoses from the weight of an expert's value and the user's value, then calculated using the certainty factor formula, the output research on the creation of an expert system for identifying student talent interests using a website-based certainty factor method which produces diagnostic results for talent interest categories.    

An expert system is a device designed with the thought processes of one or more experts in specific or complex fields of knowledge. This system is built on instructional elements that identify and analyze data to address unstructured problems or conduct mathematical analyses of particular issues. With the advancement of web-based information technology, computer damage detection becomes easier for users. Therefore, a web-based expert system application using the certainty factor method is needed to detect computer damage. The certainty factor method works based on symptoms and diagnoses weighted by experts and user input. These weights are then calculated using the certainty factor formula to produce a confidence level in the given diagnosis. The end result is the creation of an expert system application capable of detecting computer damage for users using the web-based certainty factor method. This application not only enhances efficiency in detecting damage but also facilitates maintenance processes by providing a history of damage detection, thereby reducing the time required for repairs. Thus, this application offers an effective and efficient solution for computer damage detection. Additionally, this application can be continually developed and adapted to user needs, making it a highly useful tool in computer maintenance across various environments.

Balanitis is an inflammatory disease of the tip of the penis that commonly occurs in uncircumcised men as a result of poor hygiene and aeration or because of irritation by smegma and in many cases preputial dysfunction is a causal or contributing factor. Balanitis generally attacks uncircumcised men, characterized by the glans and foreskin becoming red and inflamed. In circumcised men who do not have a foreskin, these symptoms only affect the tip of the penis. This condition often occurs due to the fungus Candida albicans, the same organism that causes vaginal yeast infections in women. Balanitis (which is also referred to as balanoposthitis) can also be caused by various other fungal or bacterial infections, or can occur due to sensitivity reactions to common chemicals. Diabetes can increase the chance of developing balanitis, especially if blood sugar is not well controlled. Currently, people who experience illness or events that have not occurred before in the genitals will consult or diagnose their illness with a specialist in skin diseases to find out what disease they are experiencing. This requires time, energy and costs just to consult a doctor. The aim of conducting this research is that currently there is no system for diagnosing inflammation of the male foreskin. For this reason, the author will create an alternative application system that can diagnose diseases that occur in the male genitals more easily by asking questions about the symptoms or events experienced as factors in the disease and providing a percentage value regarding the severity of the disease experienced.

Kucing adalah hewan peliharaan populer yang sering kali rentan terhadap berbagai penyakit. Ketidakmampuan pemilik untuk mendiagnosa penyakit kucing secara tepat waktu sering kali mengharuskan konsultasi dengan dokter hewan yang sebagian besar hanya tersedia di perkotaan. Penelitian ini bertujuan mengembangkan sistem pakar berbasis web menggunakan metode Forward Chaining dan Certainty Factor untuk membantu mendiagnosa penyakit pada kucing. Metodologi pengembangan sistem ini mencakup tahap persiapan, prototyping, dan penyelesaian. Pada tahap persiapan, masalah dirumuskan dan wawancara dengan dokter hewan dilakukan untuk membangun knowledge base. Tahap prototyping melibatkan pembuatan mesin inferensi dan knowledge base, sementara tahap penyelesaian meliputi implementasi sistem ke dalam antarmuka pengguna berbasis web menggunakan PHP dan framework Laravel. Hasil uji sistem menunjukkan konsistensi tinggi dengan hasil diagnosa manual menggunakan Excel. Sebagai contoh, diagnosa penyakit Virus Panleukopenia memiliki nilai certainty factor sebesar 94,62% pada aplikasi, sementara perhitungan manual menunjukkan 95,21%, dengan perbedaan hanya 0,41%. Hal ini menunjukkan bahwa sistem pakar yang dikembangkan mampu memberikan diagnosa yang cepat dan akurat. Kesimpulannya, sistem pakar berbasis web ini dapat diandalkan untuk mendiagnosa penyakit kucing dan membantu dokter hewan serta pemilik kucing melakukan diagnosa awal dengan lebih efisien.

Abstract -  Corn plants are one of the plants that are easy to grow and relatively fast to get results but also a plant that is vulnerable to pests and diseases. The symptoms that arise require an expert or agricultural expert to be able to diagnose. Limited time and expert labor is one of the causes of delayed diagnosis, causing a decrease in farmers' yields. This is the basis for making this expert system by adopting knowledge from agricultural experts about the symptoms of corn disease using the Forward Chaining method. To support the research conducted, researchers used the Research and Development (R&D) research method and the design used the Object Oriented Programming (OOP) method using the Unified Modeling Language (UML). Software is built using the PHP programming language, MySQL as a database, and Bootstrap as an interface design with a web-based system.    

Children under five are more at risk of experiencing nutritional disorders because during this period children will experience very rapid growth and development. Nutritional disorders can result in children's performance in activities not being optimal, hampering the growth and development process, and can even cause disease. Malnutrition sufferers in Indonesia are increasing every year, and the percentage of malnutrition in Indonesia is around 3.4%. An expert system is a computer-based system built based on facts, knowledge and reasoning that can help solve a problem. However, to measure the uncertainty and level of expert confidence in identifying and detecting malnutrition, an expert system can use the Dempster-Shafer method. The results of testing the system model using the Dempster-Shafer method on toddler nutritional diseases obtained quite good results with system accuracy of 84% with a precision value of 81.83% and also a recall value of 80%.

Cats are one of the beloved animals that require care and development. As beloved animals, cats have their own charm thanks to their different body shapes, eyes and fur colors. Cats whose pedigrees are officially registered as purebred cats. Cats, in Latin Felis silvestris catus, are a type of carnivore. The word cat usually means a domesticated cat but can also refer to large cats such as lions, tigers and leopards. Cats have been mixed with human life for at least 6000 years BC, since cat skeletons were discovered on the island of Cyprus (Arquitectura et al., 2015).  One of the diseases that often appears in cats is feline lower urinary tract disease (FLUTD), also known as feline urological syndrome (FUS), which is a health problem that often occurs in cats, especially male cats. This health problem attacks the cat's bladder and urethra. Urethral disorders are caused by the structure of the male cat's urethra, which is tube-shaped and has a narrow section, which often causes obstruction of urine from the bladder (VU) to the outside of the body. FLUTD includes several diseases that occur in the cat's urinary tract (Indonesia, 2022).  Knowledge about diseases in cats is one of the problems. Many owners do not realize that their cats are suffering from diseases that can cause death. The cause of the cat's death occurred due to the keeper's lack of knowledge regarding the disease and symptoms the cat was experiencing. Apart from that, the problem is that there are so few doctors available that they are difficult to find, and the information obtained is only in accordance with the condition of the cat when it goes to the vet. If you see other symptoms, like it or not, you have to consult the veterinarian again and it will take additional time and money. This problem can be solved with an expert system that can diagnose the disease suffered by the cat based on the selected symptoms.

An expert system is artificial intelligence that imitates the ability of an expert to solve problems in a certain domain. Utilizing a knowledge base and specified rules, the expert system provides advice or decisions that approach human expertise in this specific field, especially regarding cholesterol disease for teenagers, cholesterol disease can cause death in a person so it needs initial treatment as a diagnosis. In this regard, an expert system application is needed to diagnose cholesterol disease for users which supports the diagnosis process using the certainty factor method, based on the certainty factor which has a concept based on symptoms and diagnosis from the weight of an expert's value and the user's value, then calculated using the certainty factor formula, The final result is the creation of an expert system application for diagnosing cholesterol disease using a website-based certainty factor method.

An expert system is a collection of system engineering devices which have a structured way of thinking from one or more experts regarding certain scientific fields, both specific and complex, which are created based on an instructional element that identifies and also analyzes data at the level of irregular problems or analysis. mathematics regarding problems that cover certain aspects, but are related to the process of detecting printers and repairing them from the school which is carried out independently, then along with the development of website-based information technology which can make it easier to detect printer damage for users, then in detecting printer damage for users there are several factors that influence this, such as, not all staff at the school have knowledge in detecting printer damage and there is no system that supports detecting printer damage so it is difficult to find solutions for staff to repair, based on this problem as a solution, an expert system application design is needed. for detecting printer damage to users who support the website-based printer detection process using the forward chaining method, the concept of forward chaining with search or forward tracking techniques starting with existing information or combining rules to obtain a certain conclusion or goal as a result of the solution.

Pakar psikologi mengingatkan pentingnya untuk tidak meremehkan kesehatan mental atau depresi sejak dini karena dapat menyerang berbagai usia dan mampu memengaruhi kondisi psikis penyintasnya. Mulai dari menyalahkan orang lain, menyakiti diri sendiri, hingga menyebabkan keinginan bunuh diri, merupakan bahaya yang mengancam saat seseorang depresi. Oleh karena itu penelitian ini bertujuan untuk membuat perhitungan dengan metode fuzzy sugeno untuk mengukur tingkat depresi pada mahasiswa dan membuat sistem yang mempermudah pengguna untuk mengetahui tingkatan depresi yang dialaminya. Sampel dalam penelitian ini adalah mahasiswa Ilmu Komputer Universitas Negeri Medan. Pengambilan sampel dilakukan dengan teknik Stratified Random Sampling. 60 responden yang terukur, terdapat 40% yang terindikasi tidak ada depresi/gangguan mood, 45% terindikasi depresi sedang, dan 15% terindikasi depresi berat. Hasil akurasi metode fuzzy sugeno yang dihitung menggunakan Mean Absolute Error (MAE) dengan memperoleh 5,36 yang artinya rata-rata kesalahan mendekati nilai sebenarnya.

Sapi merupakan hewan yang hidup di darat, yang menjadikan salah satu dari sekian banyak sumber protein dan lemak yang dibutuhkan manusia. Sapi merupakan hewan pemakan tumbuhan yang sangat berguna bagi banyak orang terutama dari segi susu, daging, kulit dan kotorannya. Komoditas telur, daging, dan susu ialah komoditas pangan yang memiliki protein dan lemak yang tinggi. Sapi juga termasuk dalam kategori hewan ternak. Dalam menjaga kualitas serta pemeliharaan sapi ditemukannya kendala, yakni adanya penyakit yang menyerang sapi. Hal ini menjadi hambatan bagi peternak sapi. Kendala dalam mendiagnosis penyakit sapi ialah kurangnya pengetahuan peternak tentang penyakit sapi, keterbatasan waktu, dan pengambilan keputusan dalam proses pencegahan. Dari teknik berternak hingga penanganan penyakit, seharusnya berkonsultasi dengan ahlinya (dokter hewan) untuk mendapatan solusi terbaik dari permasalahan tersebut agar peternak mendapatkan hasil yang maksimal Dalam hal ini sistem pakar dijadikan sebagai alternatif kedua dalam membantu mengatasi pemecahan masalah. sistem pakar ini memberikan informasi tentang berbagai jenis penyakit yang menyerang hewan sapi, sistem pakar ini menggunakan metode Forward Chaining, dimana Sistem ini diharapkan dapat membantu dalam penanganan konsultasi peternak sapi dalam mendiagnosa penyakit. Sistem ini disediakan untuk memberi peluang peternak agar dapat membantu mengetahui gejala sebelum ditangani dokter hewan dan dapat mencegah gejala penyakit tersebut secara cepat.

Gangguan mental pada anak merupakan gangguan kesehatan yang terdiri dari keterbelakangan mental autis dan anxiety disorder. Banyak orang awam yang tidak menyadari bahwa anaknya mengidap gangguan autisme. Ketidaktahuan ini disebabkan oleh kurangnya informasi tentang gangguan tumbuh kembang anak, gejalanya, dan kurangnya dokter spesialis tumbuh kembang anak dan psikolog. Penyebab autisme sendiri sudah ada sebelum bayi lahir, bahkan sebelum vaksinasi. Sistem pakar adalah cabang AI (Artificial Intelligence) yang menggunakan keahlian secara luas untuk memecahkan masalah. Pakar adalah seseorang yang memiliki keahlian dalam bidang tertentu dan memiliki pengetahuan atau keterampilan khusus yang orang lain di bidangnya tidak tahu atau tidak mampu. Berdasarkan kondisi di atas, maka dibangunlah sebuah sistem yang menggunakan teknologi komputerisasi yang dapat mengadopsi kemampuan seorang ahli atau pakar yaitu teknologi Artificial Intelligence atau Kecerdasan Buatan.

Seiring dengan merebaknya penyakit yang banyak menyerang sapi maka penulis mengangkat judul Sistem pakar dengan metode forward chainning. sistem pakar adalah ilmu informasi yang berisi  seorang pakar sehingga  layak menjadi seorang pakar,  aplikasi ini dirancang dengan basis pengetahuan  fakta dan  penalaran,  dari kumpulan data - data faktual dengan mencari aturan atau gejala gejala yang sesuai hipotesis dapat digunakan untuk menentukan penentuan gejala yang sudah diidentifikasi. Perancangan aplikasi ini  berbasis mobile dengan bahasa pemrograman Java pada Android sebagai client dan database MySQL sebagai server dengan  PHP sebagai link login sehingga aplikasi ini sangat mudah digunakan dan cepat saat ingin mengakses aplikasi tersebut.  expert sistem (sistem pakar) juga dikenal sebagai sistem yang berusaha menerapkan     pemikiran manusia untuk kemudian diimplementasikan dalam  perangkat lunak, sehingga komputer dapat menyelesaikan masalah Topik seperti yang biasanya dilakukan oleh seorang profesional dalam sistem pakar ini menggunakan metode forward chainning  forward chainning ini menggunakan aturan  (if) kemudian dilanjutkan pada kesimpulan atau informasi turunan (then) sehingga menemukan fakta yang dapat ditarik sebagai kesimpulan. Forward chaining berarti menggunakan set aturan tindakan bersyarat. Teknik ini menggunakan data untuk menentukan aturan mana yang akan dieksekusi, atau  menambahkan data ke memori  untuk diproses guna menemukan hasilnya.

Kejang demam adalah bangkitan kejang yang terjadi pada kenaikan suhu tubuh (suhu rektal di atas 38 Celcius) yang disebabkan oleh suatu proses ekstrakranium. Memasukkan sendok kedalam mulut, menahan gerakan anak, memberikan selimut tebal, memberikan kopi, merupakan perilaku salah dalam penanganan kejang demam sebelum dibawa ke rumah sakit. Kejang demam pada dasarnya merupakan penyakit yang tidak berbahaya dan tidak berdampak pada sistem neurologi. Namun, kejang demam ini merupakan pengalaman yang menakutkan dan menimbulkan kecemasan pada orang tua. Hal ini disadari sebagai salah satu faktor tingkat kecemasan pada sebagian orang tua bertambah. Tujuan penelitian untuk memberi pengetahuan keluarga tentang kejang demam dengan perilaku penanganan kejang demam sebelum dibawa ke rumah sakit.

Teeth are one of human‘s organs that feeds on food. As an organ, the tooth definitely can be attacked by some disease. There are many cases of dental disease that occur from dental diseases common to people to chronic dental diseases that can be dangerous. The low level of public concern about dental disease is a problem faced today. Evidenced by the small number of people who diligently consult with dentists about the health of their teeth. An alternative option is needed that can make it easier for people to be able to consult or diagnose dental health and disease without having to see a doctor of dental health. Therefore, in this essay an expert system was created to provide alternative choices for people. This expert system was created with the php hypertext preprocessor programming language. Using the forward chaining method as a tracking method. The purpose of making this expert system is to be able to be a substitute for a dental expert so that people can already do the diagnosis of dental disease anywhere and anytime.

Penyakit hipertensi merupakan manifestasi gangguan keseimbangan hemodinamik sistem kardiovaskular yang mana patofsiologinya multifaktor yang cukup banyak mengganggu kesehatan masyarakat. Pada umumnya pasien tidak mengetahui bahwa menderita penyakit hipertensi sebelum memeriksakan tekanan darahnya, ini menyebabkan hipertensi merupakan suatu penyakit kronis yang disebut dengan silent killer. Salah satu yang dapat membantu dalam proses penegakkan diagnosa hipertensi dengan mengembangkan sebuah Rancangan Sistem Pakar Penegakan Diagnosa Penyakit Hipertensi, dalam penelitian ini menggunakan metode penelitian Inferensi Forward Chaining, Metode Support Vector Machine (SVM). Data yang digunakan yaitu data primer dan sekunder. Tujuan dari penelitian ini memudahkan tenaga medis dan penderita dalam mengetahui gejala awal penegakan diagnosa hipertensi, agar segera bisa dilakukan penangan yang cepat dan akurat. Hasil dari penelitian model SVM linear terhadap 247 data pasien menunjukkan akurasi 85% pada proses training dan 91,89 % pada proses testing.  

Penyakit ikan Koi merupakan suatu kendala atau faktor resiko bagi para peternak ikan Koi yang menyebabkan kerugian ekonomis dan menurunnya produksi ikan Koi yang dipelihara. Untuk itu diperlukan suatu perangkat lunak untuk membantu para peternak ikan Koi dalam menangani penyakit pada ikan koi. Saat ini para peternak ikan koi masih berkendala dalam penanganan gejala penyakit yang dilakukan secara manual dengan bertanya jawab bersama pakar ikan. Untuk itu tujuan dari penelitian ini merancang aplikasi sistem pakar diagnosa penyakit pada ikan koi menggunakan metode backward chaining dalam menangani penyakit pada ikan koi. Metode yang dibangun untuk penelitian ini menggunakan beberapa tahapan penelitian dengan melakukan pengumpulan data, proses desain, proses pengkodean dan proses pengujian sistem, proses perancangan aplikasi menggunakan, Visual Studio 2010.net. Hasil yang diperoleh dari penelitian ini adalah suatu aplikasi sistem pakar diagnosa penyakit ikan koi dengan menggunakan metode backward chaining yang dapat menyelesaikan masalah yang dihadapi oleh para peternak ikan koi dan sekaligus membantu para pakar untuk memberikan hasil solusi yang lebih singkat dan tidak memakan waktu.    

In this study a web-based expert system was designed using the Naïve bayes method which was intended to help farmers diagnose chili plants. The system development method used is extreme programming which consists of planning, design, coding, testing. A web-based chilli plant disease diagnostic expert system was developed using the PHP and MySQL programming languages. This expert system is capable of diagnosing chili plants by submitting disease symptoms at the time of inspection. Based on the selected symptoms, this system will provide diagnostic results and then display the disease and solutions for the chili plant disease. The results in this study concluded that there was compatibility between the results of the expert system diagnosis using the Naïve bayes method with experts.

A mental illness is a syndrome, psychological, or behavioral disorder in which a person is dysfunctional at work. The problem is that medical personnel or doctors who are professionals in the field of psychology are not comparable to mental illness, especially teenagers. The initial diagnosis by web based and using the Extreme Programming (XP) method. Meanwhile, the main objective of the research is to determine the quality of the web system based on the perceptions of respondents, namely Darul Ihsan Vocational High School students. Measuring the quality of an expert web system using the WebQual instrument. There are three aspects of WebQual that will be measured, namely: usability, information, and interaction quality. Based on the questionnaires distributed to respondents, the expert web system was developed to fulfill the three aspects of WebQual (usability, information, and interaction, with a score of 83.78%, 80%, and 82.97% in the good category.