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All Journal ASEAN Journal of Systems Engineering J@TI (TEKNIK INDUSTRI) Jurnal Teknosains Jurnal Sistem dan Manajemen Industri Jurnal Ergonomi dan K3 Communications in Science and Technology Indonesian Journal of Industrial Engineering & Management Journal of Engineering and Technological Sciences
Titis Wijayanto
Universitas Gadjah Mada
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Public Health Transportation

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A mobile application for assessing the product success on crowdfunding campaign: the development and usability testing Yanti Pasmawati; Titis Wijayanto; Alva Edy Tontowi; Budi Hartono
Jurnal Sistem dan Manajemen Industri Vol. 5 No. 2 (2021)
Publisher : Universitas Serang Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1038.439 KB) | DOI: 10.30656/jsmi.v5i2.4073

Abstract

Crowdfunding is one of the alternative sources of finance for product-based startups. Products are funded if the campaign is considered to be successful in reaching the target. The assessment of the success rate of product campaigns develops into three successive levels, namely overfunding, successful and unsuccessful. Due to the complication of setting up a product campaign on an online crowdfunding platform, a mobile application to aid campaigners needs to be developed. Moreover, it is essential to evaluate its ease to use. This study aims to (1) develop an android-based application, (2) evaluate the usability of the application based on user perceptions. The application ('POSCA') was developed by emphasizing user experience (UX), while the Use Questionnaire evaluated its usability. Ten participants were invited to evaluate the system usability and interface. The results suggest that 'POSCA' has good scores of usability: ‘efficiency’ = 49.11% in the fifth trial, ‘very-easy-to-learn’ (95%), ‘useful’ (85%), ‘easy-to-use’ (87%), and ‘satisfy-the-users’ (88%).
ANALISIS PENGARUH DIMENSI BUDAYA TERHADAP NIAT MELAKUKAN WHISTLEBLOWING : PERBANDINGAN ANTARA MAHASISWA DAN ENGINEER Dessy Finandari; Titis Wijayanto
Jurnal Teknosains Vol 6, No 1 (2016): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.27104

Abstract

This study aims to investigate the differences between engineering students and engineers on whistleblowing intentions, the effect of cultural dimensions on whistleblowing intentions, and the effect of ethnic differences on whistleblowing intentions. Each respondent was faced with three cases: a case involving a superior, a case involving a colleague, and an unknown case who was responsible. Each respondent is asked to provide an assessment related to the seriousness of cases, responsibilities and intentions to conduct whistleblowing internally or externally. Result indicate that students have intention to do internal whistleblowing higher than engineer. The lower the power distance, the higher the internal whistleblowing intention. The higher collectivism and long-term orientation, the higher the internal whistleblowing intention. Significant ethnic differences in intent to conduct whistleblowing are found in internal whistleblowing for unknown cases, and external whistleblowing in cases involving superiors
Pengaruh penempatan PCM berbahan minyak sawit pada cooling vest terhadap penurunan heat strain ketika beraktifitas fisik di lingkungan panas Titis Wijayanto; Ogie Alif Afyudin; Agasi Rizal Kurniawan Zain
Jurnal Ergonomi dan K3 Vol 3, No 1 (2018): Maret 2018
Publisher : Perhimpunan Ergonomi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (519.273 KB) | DOI: 10.5614/j.ergo.2018.3.1.2

Abstract

Paparan di lingkungan yang panas dan lembab ketika melakukan aktivitas fisik berpengaruh terhadap peningkatan risiko heat strain dan penurunan performansi kerja. Penggunaan cooling vest dengan Phase Change Material (PCM) yang dikenakan di bawah pakaian kerja banyak digunakan untuk mencegah risiko terjadinya heat strain dan untuk meningkatkan kinerja kerja, dan kenyamanan termal. Tujuan dari penelitian ini adalah untuk menentukan penempatan yang efektif dari PCM berbahan sawit pada cooling vest dengan meneliti efek fisiologis dan subyektif ketika: (1) PCM hanya dipakai di bagian depan/dada (frontal cooling) dan (2) PCM hanya dipakai di bagian belakang/punggung (back cooling). Sepuluh pria sehat (usia 21,7 ± 0,9 tahun) memakai rompi pendinginan dengan PCM saat melakukan aktivitas fisik di atas treadmil selama 30 menit dengan beban kerja sebesar 70% beban kerja maksimum di ruang dengan suhu udara 33ºC dan kelembaban relatif 80%. Dari hasil penelitian yang dilakukan dapat disimpulkan bahwa penempatan PCM di bagian belakang punggung sebagai cooling device lebih efektif dalam menurunkan risiko heat strain ketika melakukan aktivitas fisik di lingkungan panas dibandingkan dengan penempatan PCM di bagian dada.
FACTOR ANALYSIS OF HEALTHY FOOD PHOTOGRAPH Nindya Laksita Laras; Mirwan Ushada; Titis Wijayanto
ASEAN Journal of Systems Engineering Vol 6, No 1 (2022): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajse.v6i1.76128

Abstract

Lockdown is one way to reduce the transmission rate of COVID-19. Nevertheless, on the other hand, lockdowns also increase human psychological problems to cause the emergence of emotional eating. In addition, social media exposure that presents food photos can trigger the desire to eat. However, this only applies to high-fat and high-calorie foods, while healthy foods do not have the same stimuli. Therefore, more research is needed on the properties of healthy food photos desired by consumers in order to be able to create or design healthy food photos with an effect that resembles photos of high-fat and high-calorie foods. This study employed the Kansei Engineering approach in designing healthy food photos. Through Kansei Engineering, we can determine the nature of healthy food photos consumers want. The type of Kansei engineering used in this study was Kansei Engineering Type I and was limited to the Semantic Space stage. The process of factor reduction from the results of the semantic differential was carried out by using factor analysis to obtain the most critical factors related to healthy food photos. The semantic space spanning resulted in 23 pairs of Kansei words that related and represented healthy food photos. Based on the factor analysis results, these Kansei words were then into 6-factor groups. Each of the factor groups was represented by the Kansei word pair with the highest loadings value. The selected pair of Kansei words showed that healthy food photos could be represented by Kansei words attractive, contrast, proper lighting, neat, high-quality image, and straightforward. 
Human-computer trust in navigation systems: google maps vs waze Trapsilawati, Fitri; Wijayanto, Titis; Jourdy, Eggie Septiawan
Communications in Science and Technology Vol 4 No 1 (2019)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (519.181 KB) | DOI: 10.21924/cst.4.1.2019.112

Abstract

This study investigates users’ trust and reliance toward navigation systems. Forty participants participated in the experiment comparing Google Maps and Waze that have different mechanisms (data-based vs community-based). Our findings revealed that users had higher trust in Waze than Google Maps, due to the higher degree of flexibility in information sharing. Next, we found that users tend to utilize the navigation application that they have used, implying that trust in navigation system is highly associated with trustors’ prior experience and familiarity. Lastly, Google Maps users changed their reliance on Google Maps to Waze upon experiencing Waze features. This study offers several implications that system designers: (i) must ensure that the system’s transparency is maintained, (ii) should profoundly analyze possible interaction between users and computer agents, (iii) should ensure that certain safety conditions are maintained despite the freedom of information sharing provided by the computer agent
EFFECTS OF CONSUMERS’ SENSORY ATTRIBUTES ON THEIR WILLINGNESS TO PAY AND THE OPTIMUM PRICE FOR ICED COFFEE DRINKS Safira, Aretha; Masruroh, Nur Aini; Wijayanto, Titis
J@ti Undip: Jurnal Teknik Industri Vol 19, No 2 (2024): Mei 2024
Publisher : Departemen Teknik Industri, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jati.19.2.88-95

Abstract

The growing competition among coffee shops demands effective strategies, including the development of optimal pricing. An optimal pricing strategy must account for both changes in coffee ingredients and consumers' willingness to pay (WTP). This study investigated the factors influencing consumers' WTP and determined optimal prices through sensory evaluations of iced coffee. This study explored how demographic factors and sensory characteristics affect consumer WTP. This study involved direct consumer tastings, where participants provided subjective ratings of iced coffee and indicated their WTP. The coffee samples included variations in milk (white and black coffee) and sugar content (granulated sugar, palm sugar, and no sugar). To measure WTP, the Becker-DeGroot-Marschak (BDM) mechanism was employed, while a demand function was used to determine the optimal price. Stepwise backward logistic regression further analyzed the factors affecting WTP. The factors influencing willingness to pay were further analyzed using stepwise backward logistic regression. The findings reveal that optimal pricing varies, with iced coffee that includes both granulated sugar and milk commanding the highest WTP. Consumer WTP is significantly influenced by factors such as gender, frequency of coffee consumption, and individual taste preferences. There was a marked difference in WTP based on the amount of milk and sugar added, with coffee variations containing both granulated sugar and milk achieving the highest WTP. These results can serve as a valuable reference for coffee shops, helping them to determine the ideal product composition and pricing strategies to maximize revenue.
Practical Precooling Methods for Alleviating Heat Strain during Occupational Heat Exposure Wijayanto, Titis; Huda, Listiani Nurul; Rizalmi, Sigit Rahmat
Journal of Engineering and Technological Sciences Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.2.3

Abstract

Working in hot and humid environments poses significant challenges to thermoregulation and potentially affects performance and health. Strategies for mitigating heat stress are critical for workers exposed to high thermal loads. This study investigated practical cooling strategies, that is, phase-change vest (PCV) cooling and crushed ice (ICE) ingestion, before a physical activity in a hot and humid environment to alleviate heat strain. Two experiments were conducted to evaluate the efficacy of the cooling methods: the first experiment involved participants wearing a PCV for precooling, and the second experiment involved participants consuming an ICE (7.5 g/kg body mass) before exercising under the same conditions. Physiological responses including tympanic temperature, skin temperature, and heart rate, along with perceptual measures such as thermal sensation and perceived exertion, were assessed. The results showed that both the PCV and ICE interventions effectively reduced heat strain, although they had different effects. PCV cooling effectively reduces physiological and perceptual strains immediately after physical exertion; however, this effect does not last in the recovery phase. In contrast, ICE ingestion reliably lessens physiological and perceptual strains throughout the activity and recovery periods, substantially impacting both physical strain and the perception of effort. These findings highlight the significance of ICE ingestion as an effective strategy for enhancing worker health and safety in demanding thermal environments.
Analysis of Fast Food Brand Preferences using Eye Tracking and Human Information Processing Model Murni, Indah Puspa; Irfadinata, Tata; Wijayanto, Titis
IJIEM - Indonesian Journal of Industrial Engineering and Management Vol 6, No 1: February 2025
Publisher : Program Pascasarjana Magister Teknik Industri Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijiem.v6i1.27664

Abstract

Fast food is the most favored food among various age groups, from children to the elderly. There are several well-known fast food brands, such as McDonald's (MCD) and Kentucky Fried Chicken (KFC). Both brands compete in innovating and promoting their products to reach a wide target market and continuously strive to improve the quality of their products. Improved product quality is often achieved through interactions between businesses and consumers via digital marketing. Digital marketing is a medium that can accurately represent consumer needs. One of the methods used in digital marketing is through posters. This is necessary to understand consumers' desires through the thinking process when receiving information from the posters provided. This study involved 20 respondent with an average age of 30.45 ± 8.7 years. These respondent were asked to undergo two data collection processes: eye tracking through a gaze recorder website and questionnaire filling through a provided Google Form. The aim of this research is to determine the fast food brand preferences chosen by respondent based on the information obtained using Eye Tracking and the Human Information Processing Model. The results of this study indicate differences in the outcomes of the dwell time results for each age factor and time spent in AOI did not exhibit significant differences among respondent.
A mobile application for assessing the product success on crowdfunding campaign: the development and usability testing Pasmawati, Yanti; Wijayanto, Titis; Tontowi, Alva Edy; Hartono, Budi
Jurnal Sistem dan Manajemen Industri Vol. 5 No. 2 (2021)
Publisher : Universitas Serang Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30656/jsmi.v5i2.4073

Abstract

Crowdfunding is one of the alternative sources of finance for product-based startups. Products are funded if the campaign is considered to be successful in reaching the target. The assessment of the success rate of product campaigns develops into three successive levels, namely overfunding, successful and unsuccessful. Due to the complication of setting up a product campaign on an online crowdfunding platform, a mobile application to aid campaigners needs to be developed. Moreover, it is essential to evaluate its ease to use. This study aims to (1) develop an android-based application, (2) evaluate the usability of the application based on user perceptions. The application ('POSCA') was developed by emphasizing user experience (UX), while the Use Questionnaire evaluated its usability. Ten participants were invited to evaluate the system usability and interface. The results suggest that 'POSCA' has good scores of usability: ‘efficiency’ = 49.11% in the fifth trial, ‘very-easy-to-learn’ (95%), ‘useful’ (85%), ‘easy-to-use’ (87%), and ‘satisfy-the-users’ (88%).
Co-Authors Agasi Rizal Kurniawan Zain Alva Edy Tontowi Budi Hartono Budi Hartono Dessy Finandari Fitri Trapsilawati Fitri Trapsilawati Irfadinata, Tata Jourdy, Eggie Septiawan Listiani Nurul Huda Mirwan Ushada Murni, Indah Puspa Nindya Laksita Laras Nur Aini Masruroh Ogie Alif Afyudin Safira, Aretha Sigit Rahmat Rizalmi Tsuyoshi Okayama Yanti Pasmawati