Big Data is a collection of data with a large and complex size, consisting of various data types and obtained from various sources, overgrowing quickly. Some of the problems that will arise when processing big data, among others, are related to the storage and access of big data, which consists of various types of data with high complexity that are not able to be handled by the relational model. One technology that can solve the problem of storing and accessing big data is Hadoop. Hadoop is a technology that can store and process big data by distributing big data into several data partitions (data blocks). Problems arise when an analysis process requires all data spread out into one data entity, for example, in the data clustering process. One alternative solution is to do a parallel and scattered analysis, then perform a centralized analysis of the results of the scattered analysis. This study examines and analyzes two methods, namely K-Medoids Mapreduce and K-Modes without Mapreduce. The dataset used is a dataset about cars consisting of 3.5 million rows of data with 400MB distributed in a Hadoop Cluster (consisting of more than one engine). Hadoop has a MapReduce feature, consisting of 2 functions, namely map and reduce. The map function performs a selection to retrieve a key, value pairs, and returns a value in the form of a collection of key value pairs, and then the reduce function combines all key value pairs from several map functions. The results of the cluster quality evaluation are tested using the Silhouette Coefficient testing metric. The K-Medoids MapReduce algorithm for the car dataset gives a silhouette value of 0.99 with a total of 2 clusters.

Salah satu cara mengamankan suatu file agar tidak berubah-ubah pada sebuah teknik forensik digital adalah dengan cara membuat cloning suatu devices atau menyalin keseluruhan file pada suatu devices (smartphone) kedalam bentuk suatu file yaitu dalam bentuk file Image yang bisa dibuka dimanapun dan dengan tools apapun yang mendukung terbukanya file Image hasil cloningan suatu devices. Penggunaan tools forensik digital khususnya forensics mobile tergantung dari pilihan examiner dalam melakukan ekstraksi data dari file Image tersebut. Metode National Institute of Standard and Technology (NIST) digunakan dalam penelitian ini dengan tahapan seperti Coolection/Preservation, Examination, Analysis dan Reporting. Hasil ekstraksi kemudian dianalisa dengan menggunakan metode NIST didapatkan hasil dari penggunaan tools forensik Belkasoft Evidence Center berhasil melakukan ekstraksi data dari sebuah file Image smartphone android Samsung GT-S5282 dengan tingkat akurasi ekstraksi data sebesar 66,66% dari variabel yang ditentukan dan juga ditemukan file panggilan dan pesan yang sudah terhapus didevices pengguna. Tools Magnet AXIOM mendapatkan tingkat akurasi dari smartphone yang sama sebesar 55,55% dari variabel yang sudah ditentukan dan dalam proses analisis ditemukan banyak sekali file carving dalam devices pengguna. Hasil penelitian ini dapat disimpulkan bahwa tools Belkasoft Evidence Center lebih memiliki kinerja yang baik daripada tools Magnet AXIOM dalam proses exstraksi data dari sebuah file Image smartphone android. Hasil penelitian ini bisa dijadikan sebagai rujukan bagi para examiner dalam menentukan tools forensik digital yang mumpuni dalam menangani sebuah kasus kejahatan digital.

An information system is a collection of data or facts that are processed and processed in such a way as to produce something that can be understood and can be useful for the recipient. Among the general public, the need for accurate and fast information is urgently needed at this time, especially information regarding the spread of the Covid-19 disease that is hitting the world today. Covid-19 (Coronavirus) is a virus that can attack the respiratory tract and can be transmitted to anyone through droplets of phlegm. However, in conveying information by the Kerongkong Health Center officers regarding the Covid-19 distribution area in the Suralaga sub-district, they still use the socialization method. This method is considered right on target, but it is considered less effective for villages that have a fairly high distribution rate in the Suralaga sub-district. Therefore, an information system for Mapping the Covid-19 Spread Area is needed that is fast and accurate in conveying information to the public, the goal is to make it easier for the puskesmas to take preventive actions against areas that have a fairly high spread rate by looking at the location of the distribution area in the sub-district. suralaga. WebGIS is a web-based geographic information system consisting of several components, namely mapping graphic design, digital maps with geographic analysis, computer programs, and a database that are interconnected into one part. In the preparation of the stages of this research carried out by means of data collection, system design, system creation stage, testing and evaluation. The existence of WebGIS mapping the patient's location can help the throat health center in collecting data on Covid-19 patients and can quickly provide information to the public.

An inventory system is a system that manages data on items owned by an office. A good inventory system will help a company manage data on goods owned by the company. Not only do big companies need an inventory system, but small offices also need an inventory system. Likewise, with the Health Center, managing data such as drugs, medical equipment, stationery, etc., requires a good warehouse inventory system. Therefore, this service activity aims to develop and train the Health Center Warehouse Inventory application. The partner of this activity is the Sakra Community Health Center (administrative staff). The methods used are lectures, mentoring, and direct practice using applications. The result of this activity is the production of warehouse inventory system software for the Sakra Health Center. In addition, the Sakra Health Center's administrative staff can also run the software

Attendance is something that must be done by students. In the attendance process, SMPN 3 Terara still uses the manual method. Therefore, we need a student attendance system that can collect and store the data so that it can be processed quickly, efficiently and accurately. One of the technologies currently developing is QR Code, QR Code is very much needed because of its ability to store larger data so that it can provide fast and accurate services. One of the things that can be done to support the author in designing a QR Code Application for Media Student Attendance services for SMPN 3 Terara is using the Extreme Programming research method. The purpose of this research is to establish an attendance system so that the process will be more efficient and can be monitored easily by the teacher and by the academic department. The results of this study are a student attendance application that uses a QR code as a medium for student attendance input based on a local network which is implemented in order to create an attendance information system that provides convenience for students in the attendance process, reduces acts of cheating committed by students, and facilitates reports when making recaps report.