2.1 Current Presence System
The presence means to indicate whether someone is
present in the class or not. Presence system is a
system used to record attendance lists of each
member of the agency. The presence system records
the identity of members of the agency and the time of
entry and exit of its members. Presence systems also
have the ability to provide accurate reports.
In lecturing activities in the Department of
Electrical Engineering, the University of Sumatera
Utara the system must be able to include an
attendance sheet which aims to obtain student
attendance data in each subject. Presence sheet is a
form of a paper containing the name, student number
(NIM), subject, signature date, and column. Presence
data will then be entered or sent manually one by one
to the USU information system database through the
information system website provided. The collected
data will be calculated and will be used as a condition
for whether students can take the semester final
examination with a minimum attendance limit of
80%.
2.2 Student Presence System using QR
Codes
Computerized presence systems have now been
developed with many different types of software and
methods. The system developed also varies from
web-based, fingerprint, android, and biometrics. In
research conducted by Ermatita et al. (2015),
explained that the presence system using a QR code
reader could improve the efficiency of student
attendance at Sriwijaya University with 56% of
respondents expressing agreement (Ermatita, 2016).
In addition to the presence, this system can also
display lecture schedules for lecturers and students.
By using the BYOD concept (Bring your own
device), this system has a high-efficiency value in the
use of hardware. This is evidenced by each student
being able to attend presence using their Android
mobile phone. Lecturers can enter the system using
NIP data and passwords that have been determined by
the developer. By entering the system, the lecturer
can display the QR Code for student attendance and
see a list of students who have attended attendance at
the lectures brought by the lecturer. While for
department employee users can only see the results of
student attendance recapitulation. Another study
conducted by Adi Purnama (2014), with the title
"Student Attendance System Using Mobile QR Code
(Case Study of Widyatama University)" explains the
presence system with QR Code technology can
shorten student attendance by 10 minutes 59 seconds
with a cost of zero rupiahs (Purnama, 2014). Both of
these studies have proven that there is an increase in
time and cost efficiency by using the QR Code on
student attendance systems, reducing the occurrence
of fraud in the student attendance process, and
alleviating the workload of department employees in
handling student attendance.
However, these two studies still have many
limitations so that they cannot be used in different
conditions, especially to be applied in the USU
Electrical Engineering Department. The limitations
include, among other things, in the authentication
system, it does not provide data security features in
the QR Code so that the range of duplication of the
QR Code can be done by students, as well as
limitations in semester processing and classes in the
student attendance system, so that it will be difficult
to reuse in the next semester with different class
arrangements and different courses.
2.3 Web Application
A web application is an application that is accessed
using a web browser through a network such as the
internet or intranet. Web applications are computer
software applications that are encoded in languages
supported by web browsers (such as ASP, Perl, Java,
JavaScript, PHP, Python, Ruby, etc.) and depend on
the browser to display applications. The ability to
update and maintain web applications without having
to distribute and install software on the possibility of
thousands of client computers is a key reason for its
popularity: Easy information access, Server setup is
easier, Information is easily distributed and free
platform, information can be presented by web
browsers on any operating system.
2.4 Quick Response (QR) Code
Quick Response Code often called QR Code or QR
Code is a kind of two-dimensional symbol developed
by Denso Wave which is a subsidiary of Toyota, a
Japanese company in 1994. The purpose of this QR
Code is to convey information quickly and also get
responses quickly. The QR Code was originally used
for tracking vehicle parts for manufacturing. But now,
it has been used for commercial purposes aimed at
mobile phone users. QR codes are developments from
barcodes or barcodes that are only able to store
information horizontally while the QR Code is able to
store more information, both horizontally and
vertically.