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All Journal Jurnal Titra Dimensi Utama Teknik Sipil Advances in Civil Engineering and Sustainable Architecture International Journal of Computing Science and Applied Mathematics-IJCSAM
Jani Rahardjo
PETRA CHRISTIAN UNIVERSITY
Civil Engineering, Building, Construction & Architecture Industrial & Manufacturing Engineering Mathematics

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FAKTOR-FAKTOR KONSEP BANGUNAN HIJAU YANG DIPERTIMBANGKAN CALON KONSUMEN RUMAH KELAS MENENGAH DAN MENENGAH ATAS DI SURABAYA Florentcia Hartono; Timoticin Kwanda; Jani Rahardjo
Dimensi Utama Teknik Sipil Vol. 10 No. 2 (2023): Oktober 2023
Publisher : Program Studi Magister Teknik Sipil - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/duts.10.2.211-231

Abstract

Penerapan konsep bangunan gedung hijau berfokus untuk menekan emisi CO2, sehingga mengurangi efek bahaya pada lingkungan, dan pemakaian energi menjadi lebih efektif dan efisien. Sayangnya, penelitian mengenai konsep ini di Surabaya belum ditemukan. Penelitian ini bertujuan untuk mencari faktor-faktor konsep bangunan gedung hijau yang dipertimbangkan oleh calon konsumen dalam memilih rumah kelas menengah dan menengah-atas di Surabaya. Pemilihan didasari luas kavling yang besar dan tidak dibatasi harga jualnya, sehingga penerapan konsep bangunan gedung hijau lebih leluasa untuk diterapkan. Berdasarkan hasil analisis faktor dari total 108 responden yang akan membeli rumah di Surabaya dan dikumpulkan secara daring melalui kuesioner, hipotesis yang diajukan benar yaitu terdapat perbedaan faktor konsep bangunan gedung hijau yang dipertimbangkan oleh calon pembeli, dengan faktor paling dipertimbangkan yaitu desain pemanfaatan cahaya matahari dan sirkulasi udara alami. Selain itu, 88.0% responden mengharapkan bangunan rumah yang mereka pertimbangkan memenuhi faktor bangunan hijau peringkat platinum menurut standar Green Building Council Indonesia.
Optimal Incentive Mechanism for ISO 9001 Quality Audit: A Mechanism Design Approach Jani Rahardjo; I Nyoman Sutapa; Togar Wiliater Soloan Panjaitan
(IJCSAM) International Journal of Computing Science and Applied Mathematics Vol. 12 No. 1 (2026)
Publisher : LPPM Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24775401.ijcsam.v12i1.9068

Abstract

This paper develops a principal–agent model for ISO 9001:2015 quality audit in a manufacturing company, where the auditee is an informed agent and the auditor is a principal who designs an incentive-compatible audit mechanism. The proposed mechanism combines self-reported performance, risk-based audit probabilities, and quadratic penalties on deviations between reported and verified performance. We establish explicit mathematical conditions for incentive compatibility and individual rationality that guarantee truthful reporting and substantive compliance as the optimal strategy for the auditee. The mechanism is shown to be constrained Pareto optimal within a natural class of audit contracts: no alternative contract can increase the auditor’s expected utility without reducing the agent’s utility, given the informational constraints. We prove the uniqueness of this optimal solution given a maximum feasible penalty. A parametric sensitivity analysis and a case study from the Indonesian manufacturing sector illustrate how the choice of audit probability, certification benefit, and penalty parameter can transform a symbolic certification regime into an equilibrium with genuine quality improvement and credible ISO 9001 implementation
INDOOR ENVIRONMENTAL QUALITY EFFECT ANALYSIS IN GREEN AND NON-GREEN OFFICE BUILDING TO STAFF’S PERFORMANCE AND SATISFACTION IN SURABAYA Elvina Shanggrama Wijaya; Jimmy Priatman; Jani Rahardjo
Advances in Civil Engineering and Sustainable Architecture Vol. 4 No. 1 (2022): Advances in Civil Engineering and Sustainable Architecture
Publisher : Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/acesa.v4i1.14042

Abstract

The energy efficiency in an office building can decrease the company’s operational cost. Even so, the operational cost for staff is still larger than the cost for energy. It is important to reassure that the impact given by the building’s indoor environmental quality (IEQ) is positive to staff. This research focusses on two office building in Surabaya, one of them is designed using the green principles and calculations, and the other is not. The building’s IEQ aspects being inspected includes indoor air quality, thermal, lighting, acoustics and layout. A questionnaire survey was held to obtain the reaction from the full time staff regarding the building’s IEQ performance, their satisfaction to it and their self-assessed performance. There are IEQ aspects that affects staff’s performance and satisfaction significantly. The IEQ mean score differs significantly in green and non-green building, but the mean difference in satisfaction and performance were found not significant.
Co-Authors Andi Andi Andre Wijaya Aryaputra Mattotoran Bobby Yerikho Christiono Utomo DAVE WARREN TANDIONO David Prayogo Dodgalih Nur Muhammad Elvina Shanggrama Wijaya Florentcia Hartono I Nyoman Sutapa Jimmy Priatman Jonathan Christanto Handoko Stanley Filberto Ciasie Suteja Timoticin Kwanda Togar Wiliater Soloan Panjaitan