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The sport of fencing is centered on skill tactics like cutting, stabbing, or using hand agility to parry an opponent's sword. In fencing, athletes must have strong reflexes and focus in order to both attack and evade attacks from opponents. An LED lamp, a buzzer, and an ultrasonic sensor were used in the tool's design. When the athlete runs toward the sensor—which is identified by a buzzer that sounds and an LED that illuminates—the gadget functions as follows: the athlete waves his hand at the sensor. The distance between the instruments is positioned according to the athlete's needs and skill level. The website that has been developed will show the ultrasonic sensor's detecting findings. The website's architecture allows for multiple tool function configurations, including training mode, tool delay, tool duration, tool detection distance, and indicators of the number of connected sensors. When the tool's durability was tested against distance, it was found to be able to establish a connection between the client and server up to 20 meters away with an average connected time of 27.39. The tool's delay test yields an average of 14.57 seconds. an average of 0.078 when the tool's point inaccuracy is tested.

Electricity is a primary human need today. Because nowadays all equipment is electronic-based, it allows the use of large amounts of power every day. It can be seen clearly that every year the use of electricity is increasing. An example that we can see the development of the times at this time, so many restaurants are emerging. Each restaurant requires a large amount of electrical power for their production equipment. With the need for large electrical power, a tool is also needed to be able to monitor the power. One of the advances that can be felt is in the field of control, currently with the network technology, computers can be solved, especially those based on the internet / IOT (Internet Off Things) which have grown rapidly making the problem of distance and time barriers can be solved solution and time. The interface used for operation is App Invetor, which system-wise, App Inventor consists of two components, namely the server and the client. The App Inventor server functions to store all program assets and provide other services related to application (project) file management.

In an increasingly interconnected world, computer networks play a crucial role in business operations. This research focuses on the analysis of the client-server network system at PT. XYZ, which shares a building with several other companies. The objective is to evaluate the current network infrastructure, identify potential issues, and propose improvements to enhance performance and security. A qualitative approach was employed, utilizing case study methods, interviews, and observations to gather in-depth data on the network's configuration, IP address management, and security measures. The findings indicate that while the existing network functions adequately, there are significant risks associated with user access rights and the need for regular maintenance. The implications of this study suggest that implementing stricter security policies and upgrading bandwidth could mitigate risks and improve overall network reliability, thereby supporting business productivity.

This paper explores the Time-Based One-Time Password (TOTP) authentication mechanism enhanced with lightweight cryptographic algorithms, presenting it as an advanced solution to the limitations of traditional OTP systems. There are a lot of applications and systems where this mechanism is applied. For example, bank applications, e-commerce websites, access control system, healthcare system, etc. TOTP generates dynamic, time-sensitive passwords using the current time and a secret key processed through a cryptographic hash function, significantly improving security by reducing vulnerabilities to code reused and interception. The adoption of lightweight algorithms ensures that TOTP can be efficiently implemented on resource-constrained devices, such as those on the Internet of Things (IoT) ecosystem. Despite its benefits, TOTP faces challenges including synchronization issues between client devices and servers, and a trade-off between computational efficiency and security strength. This paper discusses the implications of these challenges and evaluates how TOTP, with appropriate design considerations, can provide a robust, secure, and efficient authentication method suitable for various applications, from digital banking to IoT environments.

At this moment, IoT technology was implemented in a broader area. The development of IoT technology can help human life become more manageable. IoT systems can help human activity through the natural time control system provided before. But there are some drawbacks when implementing the IoT system. One of them is the transmission process in the networking area. It’s happened because of weather, and other natural problems. Sometimes, IoT transmission can’t reach on time. It can make errors reading data on the user side. We proposed a transmission system, namely a Hybrid MP-QUIC transmission protocol, for helping in sending the data. Using this transmission protocol can reduce the response time between client and server.

Building a computer network needs significant care in selecting a configuration to ensure its efficacy and efficiency. It involves decisions about network topology, types, and device use. Security measures are essential for protecting networks with internet access from external attacks. A study conducted at an Islamic university in Indonesia indicated the use of a star network architecture and a client-server network model. The servers utilize Debian Linux. The university's security infrastructure includes a server authentication system and the setting up of a Virtual Private Network (VPN). If the server authentication difficulty is caused by a power outage, it is recommended that you use an UPS (uninterruptible power supply) to preserve power stability. Overall, security methods show up to be more effective when firewalls are installed.

This research begins with data collection through a combination of interview, observation, and literature study techniques. The problem analysis found was the slow sales service and purchase process at the store. The further impact is customer disappointment and the use of more time and energy resources. The solution offered in this research is the design of a computer-based information system that integrates workflow and optimal utilization of client server-based computer technology. The analysis in this study is presented in the form of a flowchart of the new system to be developed and analysis of the data structure using the Entity Relationship Diagram technique. Then the design results are presented in the form of a representative form design with workflow analysis described in the analysis and deployment diagram that illustrates how the system will be distributed with a client server computer technology approach. In conclusion, it is explained that the new system proposed in this design has been successfully presented logically, systematically, and easily developed into an integrative and systematic software project.

SDI Umamapu currently uses a Telkom Internet Service Provider (ISP) internet connection with a bandwidth capacity of 50 Mbps, which is only used in the principal's office and laboratory and does not cover other SDI Umamapu educational areas and limits SDI Umamapu teachers and staff from carrying out related tasks. with the Internet network. Therefore, the aim of this research is to design an Internet network using Mikrotik to help teachers and staff work more efficiently and expand the coverage area of ​​the SDI Umamapu Internet network. Apart from that, the SDI Umamapu Online Computer-Based National Examination (UNBK) is facilitated by 30 computers/laptops connected to the Internet network and other clients. In conducting research, the author uses the Network Development Life Cycle (NDLC) methodology: analysis, design, simulation, implementation, management and monitoring to build an Internet network to solve research problems. Through this research the author can learn a little more about the concept of a hotspot network and its configuration which can provide the author with knowledge about the advantages and disadvantages of Mikrotik RouterOS as a hotspot server. When measured from the results of QoS (Quality of Service) analysis before implementation, the throughput was 36.238 kbit/s (Kbps), packet loss was 1.3%, average delay was 0.389072 seconds, and throughput was 1.5% after implementation. 161.657 kbit/s (kilobits per second), average latency 0.5157133 seconds, packet loss 36%. This means that the speed of Internet access at SDI Umamapu has decreased by up to 36% due to the increase in the area of ​​the Internet network. However, even though network performance has decreased, the newly created Internet network continues to function well and smoothly.