57201_0721029101.pdf

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Performansi Kolektor Surya Pada Mesin Pendingin Yang Menggunakan Pasangan Adsorpsi Karbon Aktif Serbuk-Metanol

Study of the Effect of Bulb Ratio and Blade Angle on Propeller Turbine Performance in Horizontal Flow using Numerical Simulation

Sealing Performance Layered Metal Gasket Based on the Simulation Method Studi Korosi Baja Galvanis Melalui Perlakuan Ekspos Di Lingkungan

Perairan Sungai Cidaho - Sukabumi

Peningkatan Kekuatan Sifat Mekanis Komposit Serat Alam menggunakan Serat Enceng Gondok (Tinjauan Pustaka)

Pemodelan Pupuk Rilis Lambat Dengan Fly Ash sebagai Matriks Inert yang Dilapisi oleh Ethylcellulose

Efisiensi Energi dan Reduksi Harga Total Produksi Hidrogen pada Siklus Sulfur-Iodine Seksi III Skala Pilot Menggunakan Analisis Pinch

Analisis Pengaturan Parameter Sinusoidal Pulse Width Modulation pada High Precission Closed Loop Full Bridge Bipolar Inverter untuk Pembangkit Tegangan Tinggi Berfrekuensi Tinggi

Analisis Quality of Service Jaringan Long Term Evolution pada Mode Frequency Division Duplexing di Kota Semarang

Improving The Performance of Alumni Achievement Assessment by

Integrating Website-Based Tracer Study Information Systems and Telegram API

Faktor – Faktor yang Mempengaruhi Perkembangan Usaha Industri Konveksi Berbasis Rumah di Kelurahan Tingkir Lor

Redesain Awana Condotel Menggunakan Metode Flat Slab Berdasarkan SNI 2847-2013

Mei 2020 Vol. 41

No. 1

Halaman 1-99

Available online at: http://ejournal.undip.ac.id/index.php/teknik

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Tersedia online di: http://ejournal.undip.ac.id/index.php/teknik

Teknik, 41 (1), 2020, i

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Teknik Sipil

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Teknik Industri

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Teknik Arsitektur

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Teknik Lingkungan

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Teknik Kimia

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Teknik Perkapalan

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Teknik Mesin

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Teknik Geologi

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Teknik Elektro

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Teknik Geodesi

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Teknik Perencanaan Wilayah dan Kota

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Teknik Sistem Komputer

FOKUS DAN RUANG LINGKUP JURNAL TEKNIK

TEKNIK (ISSN 0852-1697;

http://ejournal.undip.ac.id/index.php/teknik ) adalah

peer-reviewed journal terakreditasi Ristekdikti (S2) yang mempublikasikan artikel-artikel ilmiah dari berbagai disiplin ilmu rekayasa / keteknikan. Berbagai topik dalam ilmu rekayasa / keteknikan dapat diterima di jurnal ini, meliputi:

Artikel-artikel yang dipublikasikan di jurnal Teknik meliputi hasil-hasil penelitian ilmiah asli (prioritas utama), artikel ulasan ilmiah yang bersifat baru (tidak prioritas), atau komentar atau kritik terhadap tulisan yang ada di jurnal Teknik. Jurnal Teknik menerima manuskrip atau artikel dalam bidang teknik/rekayasa dari berbagai kalangan akademisi dan peneliti baik nasional maupun internasional.

Artikel-artikel yang dimuat di jurnal Teknik adalah artikel yang telah melalui proses penelaahan oleh Mitra Bebestari (peer-reviewers). Mulai tahun 2014, jurnal Teknik hanya menerima artikel-artikel yang berasal dari hasil-hasil penelitian asli (prioritas utama), dan artikel ulasan ilmiah yang bersifat baru (tidak prioritas). Keputusan diterima atau tidaknya suatu artikel ilmiah di jurnal ini menjadi hak dari Dewan Penyunting berdasarkan atas rekomendasi dari Mitra Bebestari.

INFORMASI INDEKSASI JURNAL

TEKNIK (ISSN 0852-1697;

http://ejournal.undip.ac.id/index.php/teknik) adalah

peer-reviewed journal

yang sudah terindeks di beberapa pengindeks bereputasi, antara lain: Google Scholar; Directory of Open

Access Journal (DOAJ); Indonesian Publication Index (IPI), Sherpa/Romeo, dan SINTA Science and

Technology Index.

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Teknik, 41 (1), 2020, ii

TIM EDITOR

Ketua Penyunting (Editor in Chief):

Dr. Eng. Wahyul Amien Syafei, S.T., M.T. (Teknik Elektro, Universitas Diponegoro)

Dewan Penyunting (Editorial Board):

Prof. Dr. Istadi, S.T., M.T. (T Tenik Kimia, Universitas Diponegoro) Prof. Dr. Ir. A. P. Bayuseno, M.Sc. (Teknik Mesin, Universitas Diponegoro) Prof. Dr. Ir. Sri Prabandiyani, M.Sc. (Teknik Sipil, Universitas Diponegoro) Dr. Ir. Maria Wahyuni, M.T. (Teknik Sipil, Universitas Katholik Soegijapranata)

Dr. Ir. Atik Suprapti, M.T. (Teknik Arsitektur, Universitas Diponegoro)

Mitra Bebestari (Peer-Reviewers):

Prof. Dr. Istadi, S.T., M.T. (Teknik Kimia, Universitas Diponegoro) Prof. Dr. Moh. Djaeni, S.T., M.Eng. (Teknik Kimia, Universitas Diponegoro)

Muhammad Zubair Muis Alie, S.T., M.T., Ph.D-Eng. (Teknik Kelautan, Universitas Hasanuddin) Nanang Masruchin, S.T., M.T., Ph.D. (Lembaga Ilmu Pengetahuan Indonesia)

Dr. Eng. Gunawan Dwi Haryadi, S.T., M.T. (Teknik Mesin, Universitas Diponegoro) Dr. Sulardjaka, S.T., M.T. (Teknik Mesin, Universitas Diponegoro)

Dr. Wahyul Amien Syafei, S.T., M.T. (Teknik Elektro, Universitas Diponegoro) Aghus Sofwan, S.T., M.T., Ph.D. (Teknik Elektro, Universitas Diponegoro) Mochammad Facta, S.T., M.T., Ph.D (Teknik Elektro, Universitas Diponegoro)

Dr. Yulita Arni Priastiwi, S.T., M.T. (Teknik Sipil,Universitas Diponegoro) Dr. Yasser Wahyuddin, S.T., M.T., M.Sc. (Teknik Sipil,Universitas Diponegoro)

Eko Handoyo, S.T., M.T. (Teknik Elektro, Universitas Diponegoro)

Dr. Ing. Prihadi Nugroho, S.T., M.T. (Teknik Perencanaan Wilayah dan Kota, Universitas Diponegoro) Diah Intan Kusumo Dewi, S.T., M.Eng. (Teknik PWK, Universitas Diponegoro)

Staf Editorial Office:

Dr. Yasser Wahyuddin, S.T., M.T., M.Sc.

Ari Eko Widyantoro, S.T., M.Si Lis Setyowati, S.Sos., M.A.

Indah Wulani, A.Md Ramaji Mardian, S.IP

Penerbit:

Fakultas Teknik, Universitas Diponegoro

Sekretariat: Dekanat Fakultas Teknik, Universitas Diponegoro, Jl. Prof. H. Soedarto, Kampus Undip

Tembalang, Semarang, Tel. (024) 7460053

Website: http://ejournal.undip.ac.id/index.php/teknik;

E-mail: [email protected]

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Teknik, 41 (1), 2020, iii

KATA PENGANTAR

TEKNIK (p-ISSN 0852-1697, e-ISSN: 2460-9919) adalah jurnal ilmiah terakreditasi Nasional Ristekdikti (S2), yang diterbitkan oleh Fakultas Teknik Universitas Diponegoro. Volume 41 Nomor 1 Tahun 2020 (Mei 2020) merupakan edisi ke-1 untuk penerbitan tahun 2020. Artikel-artikel yang diterbitkan oleh Jurnal Teknik telah dipublikasi secara Fulltext dan Open Access dalam format PDF secara online di http://ejournal.undip.ac.id/index.php/teknik. Mulai tahun 2014, hanya artikel-artikel yang berasal dari hasil-hasil penelitian saja yang dapat dimuat di jurnal Teknik setelah ditelaah para mitra bebestari.

Artikel-artikel yang termuat dalam Jurnal TEKNIK ini adalah artikel-artikel yang sudah melalui proses penilaian atau review oleh Mitra Bebestari dan/atau Dewan Penyunting. Penulis harus memperhatikan kualitas isi artikel sesuai petunjuk penulisan artikel dan komentar dari Mitra Bebestari yang ditampilkan di masing-masing penerbitan atau dapat didownload di website jurnal tersebut. Jumlah artikel yang terbit pada nomor ini sebanyak 12 judul, meliputi bidang- bidang teknik mesin, metalurgi, kimia, komputer, energy listrik, perencanaan wilayah dan kota, dan sipil. Jurnal TEKNIK nomor ini menyajikan karya penulis dengan beragam afiliasi, tidak hanya dari dalam, namun juga dari luar negeri. Penulis luar negeri yang berkontribusi pada edisi Mei ini diantaranya dari Yamaguchi University dan National Taiwan University of Science and Technology. Afiliasi penulis dari dalam negeri juga beragam, mulai dari Universitas Diponegoro sendiri, Pusat Penelitian Metalurgi dan Material – Lembaga Ilmu Pengetahuan Indonesia, Pusat Penelitian dan Pengembangan Jalan dan Jembatan - Kementerian Pekerjaan Umum dan Perumahan Rakyat; Universitas Sumatera Utara,Universitas Sebelas Maret, University of Udayana, Universitas Teknologi Yogyakarta, Universitas Nusantara PGRI Kediri, dan Universitas Islam Balitar.

Dewan Penyunting akan berusaha terus meningkatkan mutu jurnal sehingga dapat menjadi salah satu acuan yang cukup penting dalam perkembangan ilmu-ilmu keteknikan. Penghargaan dan terima kasih yang sebesar-besarnya kepada Mitra Bebestari bersama para anggota Dewan Penyunting dan seluruh pihak yang terlibat dalam penerbitan jurnal ini.

Dewan Penyunting juga mengharapkan artikel ilmiah dari para pembaca untuk dapat diterbitkan pada Volume 41 Nomor 2 Tahun 2020 (Agustus 2020) setelah melalui proses telaah oleh Dewan Penyunting dan/atau Mitra Bestari.

Mulai Volume 35 Tahun 2014, jurnal Teknik tampil dengan gaya selingkung yang baru dan format artikel yang baru menuju yang lebih baik, serta dilengkapi dengan Digital Object Identifier (DOI). Petunjuk penulisan lengkap untuk tahun 2020 ditampilkan di portal jurnal ini.

Salam,

Ketua Penyunting

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Teknik, 41 (1), 2020, iv

DAFTAR ISI

Fokus, Ruang Lingkup dan Informasi Indeksasi Jurnal i

Tim Editor ii Kata Pengantar iii

Daftar Isi iv

Performansi Kolektor Surya Pada Mesin Pendingin Yang Menggunakan Pasangan Adsorpsi Karbon Aktif Serbuk-Metanol

Tulus Burhanuddin Sitorus, Syahrul Abda

Departemen Teknik Mesin Fakultas Teknik , Universitas Sumatera Utara; PUI Energi Berkelanjutan dan Biomaterial, Universitas Sumatera Utara

1 - 8

Study of the Effect of Bulb Ratio and Blade Angle on Propeller Turbine Performance in Horizontal Flow using Numerical Simulation

Akhmad Nurdin, Dwi Aries Himawanto, Syamsul Hadi

Departemen Teknik Mesin Fakultas Teknik, Universitas Sebelas Maret

9 - 13

Sealing Performance Layered Metal Gasket Based on the Simulation Method

I Made Gatot Karohika, Shigeyuki Haruyama, I Nyoman Gde Antara, I Nyoman Budiarsa, I Made Dwi Budiana Penindra

Department of Mechanical Engineering, University of Udayana; Graduate School of Innovation and Technology Management, Yamaguchi University

14 - 19

Studi Korosi Baja Galvanis Melalui Perlakuan Ekspos Di Lingkungan Perairan Sungai Cidaho - Sukabumi Ahmad Royani, Gadang Priyotomo, Hadi Gunawan, Joko Triwardono, Lutviasari Nuraini, Siska

Prifiharni, Heri Nugraha, Sugiarti, Sundjono

Pusat Penelitian Metalurgi dan Material, Lembaga Ilmu Pengetahuan Indonesia; Pusat Penelitian dan Pengembangan Jalan dan Jembatan, Kementerian Pekerjaan Umum dan Perumahan Rakyat

20 - 26

Peningkatan Kekuatan Sifat Mekanis Komposit Serat Alam menggunakan Serat Enceng Gondok (Tinjauan Pustaka)

Sulardjaka, Sri Nugroho, Rifky Ismail

Departemen Teknik Mesin Fakultas Teknik, Universitas Diponegoro

27 - 39

Pemodelan Pupuk Rilis Lambat Dengan Fly Ash sebagai Matriks Inert yang Dilapisi oleh Ethylcellulose Kemal Maulana, Mohamad Djaeni

Departemen Teknik Kimia Fakultas Teknik, Universitas Diponegoro

40 - 47

Efisiensi Energi dan Reduksi Harga Total Produksi Hidrogen pada Siklus Sulfur-Iodine Seksi III Skala Pilot Menggunakan Analisis Pinch

Sonya Hakim Raharjo, Ima Winaningsih, Widayat Widayat

Magister Teknik Kimia Fakultas Teknik, Universitas Diponegoro; Departemen Teknik Kimia Fakultas Teknik,Universitas Diponegoro

48 - 54

Analisis Pengaturan Parameter Sinusoidal Pulse Width Modulation pada High Precission Closed Loop Full Bridge Bipolar Inverter untuk Pembangkit Tegangan Tinggi Berfrekuensi Tinggi

Abdul Syakur, Arifin Wibisono

Departemen Teknik Elektro Fakultas Teknik, Universitas Diponegoro

55 - 61

Analisis Quality of Service Jaringan Long Term Evolution pada Mode Frequency Division Duplexing di Kota Semarang

Annisa Rossy Rahmatika, Sukiswo Sukiswo, Eko Didik Widianto

Departemen Teknik Komputer Fakultas Teknik, Universitas Diponegoro; Departemen Teknik Elektro Fakultas Teknik Universitas Diponegoro

62 - 71

Improving The Performance of Alumni Achievement Assessment by Integrating Website-Based Tracer Study Information Systems and Telegram API

Sucipto, Ervin Kusuma Dewi, Nalsa Cintya Resti, Indyah Hartami Santi

Universitas Nusantara PGRI Kediri; National Taiwan University of Science and Technology;

Universitas Islam Balitar

72 - 77

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Teknik, 41 (1), 2020, v

Faktor – Faktor yang Mempengaruhi Perkembangan Usaha Industri Konveksi Berbasis Rumah di Kelurahan Tingkir Lor

Debora Decynthia Saragih, Wido Prananing Tyas

Departemen Perencanaan Wilayah dan Kota Fakultas Teknik, Universitas Diponegoro

78 - 91

Redesain Awana Condotel Menggunakan Metode Flat Slab Berdasarkan SNI 2847-2013 Samsul Hasibuan, Dwi Kurniati

Program Studi Teknik Sipil Fakultas Sains dan Teknologi, Universitas Teknologi Yogyakarta

92 - 99

Petunjuk Penulisan 2020 (Author Guidelines 2020) App.1-5

Erratum App.6

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Tersedia online di: http://ejournal.undip.ac.id/index.php/teknik

TEKNIK, 41 (1), 2020, 72-77

Improving The Performance of Alumni Achievement Assessment by Integrating Website-Based Tracer Study Information Systems

and Telegram API

Sucipto^1*, Ervin Kusuma Dewi ², Nalsa Cintya Resti ¹, Indyah Hartami Santi ³

1Universitas Nusantara PGRI Kediri

Jl. KH. Ahmad Dahlan No.76, Mojoroto, Kec. Mojoroto, Kota Kediri, Indonesia 64112 2 National Taiwan University of Science and Technology,

No. 43號, Section 4, Keelung Rd, Da’an District, Taipei City, Taiwan 106 3Universitas Islam Balitar,

Jl. Majapahit No.2- 4, Sananwetan, Kec. Sananwetan, Kota Blitar, Indonesia 66137

Abstract

It is the mission of Vocational High School (SMK) education in Indonesia to produce highly competitive and skilled graduates. One standard for evaluating the success of vocational education is assessing the achievements of alumni. The evaluation process can be carried out with programmed alumni tracking activities or commonly known as tracer studies. However, the implementations of tracer studies that have been carried out by vocational schools in Kediri are still using the manual method. These conditions make the school find many obstacles in the implementation of tracer studies. Some schools have used technology with e-mail applications but have financial constraints. This research aims to improve the performance of assessing the alumni achievement of Vocational Schools in Kediri by integrating the website-based tracer study information system with social media Telegram API. Usability testing that gave 4.83 of 5 scales has shown that the integration can improve the performance and benefits of an application compared to the application before integration.

Keywords: tracer study; API; social messaging; Telegram; web-based

1. Introduction

The high growth of vocational high school (SMK) in Indonesia, particularly in the area of Education Office of Kediri Regency, is signified by the proliferation of the opening of the SMK and the increased interest of young people continue their education in the field. The success of its implementation is inseparable from the assessment system conducted by the government (Fitri, 2018). One standard for evaluating the success of vocational education is assessing the achievements of the alumni.

The evaluation includes the relevance to the working world, the number of graduates absorbed, and graduates' competency suitability with the labour market’s needs. The evaluation process can be carried out with programmed alumni tracking activities, commonly known as tracer studies (Sa’idah, Andriyani, & Saefudin, 2017). However, the Kediri vocational school tracer studies still use manual methods. Therefore many obstacles faced. Paper- based alumni data collection is inefficient as the paper gets easily damaged and dirty, while it is also

challenging to reach graduates who are outside the city. Those who used e-mail face financial constraints. The telephone is also ineffective because not all alumni are willing and have time to be interviewed directly. School also sent questionnaires by mails, but not all graduates gave feedback (Wicaksono, Hartanto, & Azhar, 2017). Tracer study is expected to be the best way to gather alumni feedback to support the evaluation process.

Based on those facts and given the rapid technological developments, a system can be designed to get alumni data by combining website technology with the social media API, namely Telegram (Sajad, Hossein Heidari, & Azizeh, 2019). Using website to collect alumni data, one will gain the benefits of easier access to the website; easier access to the data, more efficient and effective process, inexpensive cost, and easier data management (Astini, Agustini, &

Santyadiputra, 2016; Nugroho & Nugroho, 2018).

Moreover, the Telegram API feature serves as a reminder through a mobile chat application when alumni have not yet sent a tracer study report.

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and As'ad in 2017, entitled "Web-Based Information Systems and Analysis of the Relevance of Tracer Studies at University of Prof. Dr. Hazairin, SH Bengkulu." The research discussed the process of gathering information on the performance of graduates using website media. They concluded that the relevance of the graduates' education to the work that they are currently engaged in as consideration for improving the education and teaching system (Diana & As’ad, 2017).

Another research was carried out by Nugroho and Nugroho in 2018 entitled "Career Center System and Higher Education Tracer Study." The research discussed the design of systems and career center and tracer studies in tertiary institutions using the System Development Life Cycle (SDLC) to determine the absorption and position of graduates in the industry, compile learning process strategies, and improve the quality of graduates. The results of the study showed the needs of the career center and tracer study system. They were also able to optimize the function of alumni data services for tertiary institutions (Nugroho & Nugroho, 2018).

A research conducted by Wicaksono, Hartanto, and Azhar in 2018 entitled "Alumni Career Information System and Tracer Study Case Studies in Informatics Engineering Study Program, University of Muhammadiyah Malang." The study discussed the design of tracers that engage users through Facebook.

However, the system tools used were Google Form;

therefore, the system has not been structured and unsystematic. The study results showed that the system accommodated the needs of filling and making alumni search results (Wicaksono et al., 2017).

Based on the previous research discussed, one can conclude that the researches were carried out to serve the need for information technology, particularly for website based-services. A common problem found in the studies was that they applied manual systems, and information were not well distributed. A different approach to the study needs to be done, by designing a system with Telegram API feature. The system is online, making it easier to distribute information. Notification can be delivered to alumni through Telegram application messages.

Based on the description above, the tracer study information system will be implemented at the vocational school in Kediri. The results are expected to help schools independently track alumni with website media and social media chat using the telegram API.

2. Research Method

This research was conducted to create an system.

A system is a group of elements that are strictly interconnected and work together to achieve specific goals. Besides, information is generally defined as the

result of processing data into a more useful form. Thus, it can be concluded that the information system is a system that provides information to all parties of an organization (Hartono, 2007).

The system was designed for tracer study. Tracer study is a study of graduates from an education unit to dig up information through filling out questionnaires arranged in such a way as to improve curriculum and educational processes in a school (Schomburg, 2003).

This system also use Telegram as an important feature.

Telegram is a messaging software program that focuses on speed and security. Telegram can send text messages, pictures, videos, files (doc, zip, mp3).

Sketchily, Telegram is described as a combination of SMS and E-mail. One of the unique features that Telegram has is that users can create APIs through bots.

This Telegram bot can act like a human telegram account to send and receive messages. A telegram bot can be created by registering it with @botfather on the Telegram (Telegram, 2019a, 2019b).

Figure 1. Metode Bot API Telegram

There are two of the most popular bot management methods, as shown in Fig. 1 long-polling and webhooks. The bot management function is to share data efficiently between applications and application users. Both ways have advantages and disadvantages.

Long-Polling is the default method of Portable Telegram, which means that the process can be run on various devices, including computers, cellphones, IoT devices, and routers. This method does not require using an online server. The disadvantages of this method include that the process of reading a chat is quite long.

The update process is not realtime. Webhook has the advantage of reading conversations faster than long- polling. This method can be run for 24 hours because it

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TEKNIK, 41 (1), 2020, 74

method can update the script in realtime (Hasan, 2016).

The research used the Linear Sequential Model method. This method demonstrates a systematic and sequential approach to software development that starts at the system level and develops through analysis, design, coding, and testing (Dharmawan, Sucipto, & Indriati, 2019). Fig.2 illustrates a linear sequential model for software engineering. System/information engineering and modeling become part of the business system. The steps began by setting requirements for all system elements and then allocating some of these requirements to the software.

Software systems must interact with other elements, such as hardware, people and databases. Systems engineering and analysis includes gathering requirements at the system level with a small number of top-level design and analysis.

Information techniques include gathering requirements at the strategic business level and the business area level (Pressman, 2010).

On the analysis stage, the process done was gathering requirements intensified and explicitly focused on the software. As for the design stage, the activity conducted was designing software with diagrams. On the coding stage, activities at this stage was creating code. The last stage, testing, focused on the logical internal of the software, ensuring that all statements have been tested and on the functional external.

3. Result and Discussion

This research was conducted following the Linear Sequential Model. This method uses a systematic and sequential approach to software development that starts at the system level and develops through analysis, design, coding, and testing. This research model is illustrated in Fig. 2.

The steps taken are tracer study system analysis.

Researchers have collected data on several stakeholders, including sampling to Vocational Schools, ICT Subject Teacher Representatives and MGMP Guidance Counseling (BK) representatives. The next stage is to make an application design information system based on data that has been obtained. The design stage consists of two steps, namely diagram design that will use Data Flow Diagrams

(DFD) and interface design for information system interfaces.

The level 0 diagram design scheme in Fig. 3 shows the basic system flow of the tracer study information system products. Entities in the information system consist of 3, including alumni, admin appointed by the school to monitor and manage system reports and bot tracer study which is a robot as a guide to serving every alumni question. In Fig. 3, there are several business processes on each entity. Alumni entities can register independently, log into the system, find out various information such as about job vacancies, fill out alumni tracking forms and alumni will get notifications from bot tracer study.

The admin entity has several business processes including mass registration of alumni, logging into the system, providing information to alumni, viewing alumni data statistics, viewing alumni data, exporting alumni data and logging system control. Telegram bot entities serve as servants for alumni. One of the tasks performed by the bot is for the registration section and to provide various notifications to alumni and admins. Bot ease the burden of admin to serve a wide range of questions put by the alumni.

Fig. 4 is a database relation design in information systems — database design by DFD derivatives. There are six tables connected except the siswa_temp table. The siswa_temp table is used for temporary shelters for alumni import data

The database table design in Fig. 4 consists of two different engines (S. Sucipto, Resti, Andriyanto, Karaman,

& Qamaria, 2019; Sucipto Sucipto, 2017). The machines used are InnoDB and MyISAM. Only the siswa_temp table uses the MyISAM engine. The siswa_temp table functions as a temporary student table when uploading data to a web- based system. In addition to siswa_temp tables, all other tables use the InnoDB engine which is used as a database relation on the MariaDB database. The use of the MyISAM type engine can optimise databases with non-relational models (Abadi et al., 2018; Rijati et al., 2015; Sucipto, Indriati, & Hariawaan, 2017). Using the MyISAM Enginedcan determine DML priorities with commands LOW_PRIORITY, DELAYED, and HIGH_PRIORITY (Dyer, 2015).

Figure 2. Linear Sequential Model Figure 3. Level 0 DFD

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design uses the bootstrap framework with the adminLTE template. AdminLTE interface, as shown in Fig. 5.

AdminLTE is an opensource admin dashboard intended for information system panels. AdminLTE is built using the Bootstrap framework. AdminLTE provides various components that are responsive, reusable, and commonly used.

The code phase uses sublime text version 3 tools.

Sublime Text is an advanced text editor for code, markup, and prose. This tool can be used in a variety of code languages, including those used in making tracer study information systems, namely the PHP and SQL programming languages. The code structure in the tracer study information system consists of various modules that are interrelated. Modules enter the program directory. Display in the program directory is shown in Fig. 5. The module consists of CSS modules, namely jQuery, bootstrap, awesome and ionic fonts. Program modules include PDF, excel and server-side data table modules.

The interfaces in the tracer study information system are divided into two entities: admin and alumni.

Some access rights are following the diagram design in

Fig. 6. The design is then combined with the PHP and SQL coding process.

There are five admin modules, including: (1) a news module; (2) a control module; (3) an export module; (4) a message module; and (5) a student module. The news module manages information such as job vacancies, whereas the control module manages alumni login management. The export module aims to export alumni data such as alumni tracking data, while the message module sends messages to alumni. The student module manages alumni identity data, including the import of alumni registration, who do not register through the standalone system. One of the telegram API notification features is notification via Telegram to the school manager when the alumni fill in the data. The notification result is shown in Fig. 7.

The alumni module consists of 4 modules, namely: (1) the alumni module located in the alumni directory and alumni2 which functions as an alumni search form module; (2) the results module to display the history of filling alumni searches; (3) the password module to change alumni password data; and (4) the message module to send messages to the admin.

Figure 4. Tracer Study Database

Figure 5. Interface AdminLTE

Figure 6. Tracer Study System Page

Figure 7. Bot Telegram Notification

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functionality testing showed that all functions went well because the prototype met the functional and user requirements. System testing uses the usability method to determine the level of effectiveness, efficiency, and satisfaction. The results of the usability testing were shown in Figure 8.

Figure 8. Application Testing

Figure 8 is the result of usability testing.

Assessments were based on effectiveness, efficiency, and satisfaction (Sucipto, Hariawan, Nurita, &

Tammam, 2018). The test was carried out based on eight trials. The results show an improvement in the quality of the application, which is seen based on the 1st-to-8th trials chart.

The results of Figure 8 show an increase in the quality of application testing. The increasing value shown in Figure 8 was obtained after prototype improvement, making it easier for respondents when re- using the application. Test results indicate that usability tests can improve the performance and benefits of an application.

4. Conclusion

Integration of the website-based tracer study information system with social media API Telegram has been done. Usability testing that gave 4.83 of 5 scales has shown that the integration can improve the performance of assessing the alumni achievement of Vocational Schools in Kediri. It also can improve the benefits of the application compared to the application before integration.

Acknowledgment

The author would like to thank the Directorate of Research and Community Service (DRPM) of the Indonesian Ministry of Research and Technology who has provided financial support for this research through a beginner lecturer research scheme (PDP).

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