Petra Christian University

About: Petra Christian University is a education organization based out in Surabaya, Indonesia. It is known for research contribution in the topics: Population & Customer satisfaction. The organization has 2412 authors who have published 2893 publications receiving 10429 citations.

Pengaruh stimulus media iklan, uang saku, usia, dan gender terhadap kecenderungan perilaku pembelian impulsif (studi kasus produk pariwisata)

Abstract: The aim of this reseach is to test the effect of advertising stimulus through audiovisual media, picture animation, online text and offline text, student’s pocket money, age and gender on tendency of impulsive buying behavior. The design of the research is in the form of experimental factorial design by using media format as the treatment factor. Findings shows that there is a different stimulus factor between online media format with offline media. Eventhogh online media format has significant stimulus effect on tendency of impulsive buying behavior, audio visual media and text in the form of picture animation media have stronger effect. The result also show that student’s pocket money, age and gender have no effect on impulsive buying behavior tendency. The result is contradictory with findings from previous research that shows an effect of those factors on impulsive buying behavior for offline physical products. Abstract in Bahasa Indonesia: Penelitian ini bertujuan untuk menguji pengaruh stimulus iklan melalui format media audio-visual, animasi gambar, dan teks gambar secara online dan teks gambar secara offline, uang saku, umur, dan gender terhadap kecenderungan perilaku pembelian impulsif. Desain penelitian berbentuk rancangan percobaan faktorial dengan memasukan format media sebagai faktor perlakuan. Hasil penelitian menunjukan bahwa terdapat perbedaan pengaruh stimulus antara format media online dengan offline. Walaupun secara total format media online mempunyai pengaruh stimulus yang signifikan terhadap kecenderungan perilaku pembelian impulsif, ternyata format media audio visual dan teks gambar mempunyai pengaruh yang lebih kuat dari bentuk format media animasi gambar. Hasil penelitian menemukan juga, bahwa tidak terdapat pengaruh uang saku, umur, dan gender terhadap kecenderungan perilaku pembelian impulsif. Hal ini berbeda dengan hasil penelitan sebelumnya, yang menemukan bahwa faktor-faktor tersebut berpengaruh terhadap perilaku pembelian impulsif produk-produk phisik secara offline. Kata kunci: online, impulsif, media online, produk pariwisata.

Automatic seasonal auto regressive moving average models and unit root test detection

Abstract: It is well known that in the reality, sequential data more likely exhibit a non-stationary time series or a seasonal non-stationary time series than the stationary one. Therefore, a hypothesis is needed for testing those properties in the time series. Various tests are available in the literature; however in this study unit root test of Dickey fuller, augmented Dickey fuller and seasonal Dickey fuller test are applied. Moreover, a forecasting program is designed by using R 2.3.0. This program executes raw data and gives information of the best time series model in the sense of minimum AIC (Akaike information criterion). By using this program, a user who doesn't have a grounded background in time series analysis will be able to forecast a short-period of future value of time series data accurately. The analysis of data consists of box-cox transformations, unit root test, removing unit root and seasonal components, finding the best time series model for the data, parameter estimation, models diagnostic checking, and forecasting of the future value time series.

Laminar burning velocity and flammability characteristics of biogas in spark ignited premix combustion at reduced pressure

Abstract: Biogas as a “Powergas” is an alternative fuel produced in digestion facilities, that is sustainable and renewable. Based on chemical analysis, the composition of the biogas produced in East Java is 66.4% methane, 30.6% carbon dioxide and 3% nitrogen. Methane is a flammable gas, whereas, nitrogen and carbon dioxide are inhibitors. Given it has a different composition to traditional fuels, a fundamental study of biogas flame propagation characteristics is desirable to quantify this important fuel property. Spherically expanding flames propagating at constant pressure are employed to measure the laminar burning velocity and flammability characteristics as mixture function of the mixture composition. These important parameters were measured using a photographic technique in a high pressure fan-stirred bomb. The characteristics of biogas-air flames were initially studied at reduced pressure and at various equivalence ratios from the lower flammable limit to the upper flammable limit. The results were compared with those from biogas-air flames at atmospheric pressure. Based on this experimental investigation, the laminar burning velocities of biogas-air mixtures at reduced pressure were 0.218 m/s for ϕ=0.75, 0.246 m/s for ϕ=0.80 and 0.269 m/s for ϕ=0.85 respectively and only for these biogas mixtures propagated at reduced pressure. At the same equivalence ratio (ϕ), the laminar burning velocities of the biogas-air mixtures at reduced pressure are higher than those at atmospheric pressure. The flammable region of biogas became narrower by reducing initial pressure. The dilution effect is stronger at reduced pressure. Therefore, the flammable composition mixture areas of biogas-air mixtures are more limited at reduced pressure than those at atmospheric pressure.

Corporate social responsibility, purchase intention dan corporate image pada restoran di surabaya dari perspektif pelanggan

Abstract: This research is done to find out the implementation of Corporate Social Responsibility (CSR) towards purchase intention in some restaurants in Surabaya by using corporate image as an intervening variable. There are 105 respondents who become the customers of some restaurants implementing CSR. CSR is viewed from triple bottom line dimensions, which are economic dimension, social dimension, and environmental dimension. The research shows that Corporate Social Responsibility (CSR) has direct influence on purchase intention as well as corporate impage; whereas corporate image has influenced directly on purchase intention. In this case corporate image serves as an intervening variable between Corporate Social Responsibility and purchase intention.

The influence of ERP system to the company performance seen through innovation process, information quality, and information sharing as the intervening variables

Abstract: Enterprise Resource Planning (ERP) system is an integrated information technology that combines all departments in a company with a single data entry. The ERP system is used to obtain quality information so that the head of the companies can easily make decisions accurately and timely. The information is also distributed among all related departments through sharing information. The quality information can improve the innovation process and company performance. Based on the questionnaires distributed to manufacturing companies in East Java and the data processed by SEM PLS, there are several conclusions. First, the ERP directly influences the information sharing but does not significantly influence the information quality. Second, innovation sharing influences directly the information quality and innovation process, but it does not give impacts to the operational performance. Third, the innovation quality has an impact on the innovation process and the operational performance. Fourth, the innovation process has a positive and significant impact directly to the operational performance