ORCID Profile
0000-0002-7335-004X
Current Organisations
Faculty of Economics and Business Universitas Indonesia
,
Monash University
,
University of Western Australia
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Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 10-2020
Publisher: AIP Publishing
Date: 07-2022
DOI: 10.1063/5.0096549
Abstract: SARS-CoV-2 can be transmitted through contact with fomite, respiratory droplets, and aerosolized viruses. Recent evidence suggests that aerosol transmission represents a significant route of infection. In relation to healthcare workers (HCWs), much attention has been focused on personal protective equipment, yet this is the lowest level of the Centers for Disease Control and Prevention hierarchy of controls. Although engineering controls are prominent in the hierarchy, little attention has been given to developing effective interventions. This study aims to evaluate the performance of a simple extraction device in a clinical setting. This was accomplished by using a high flow local extraction (HFLE) that was connected to the existing ventilation system of the hospital on one end and to an intake nozzle near the patient's airway on the other end. Propylene glycol was aerosolized through a physiological test apparatus to simulate the breath of a patient. The field of interest was illuminated using a laser sheet in two planes from the model, namely, the sagittal plane and the transverse plane, and the movement of the simulated aerosol was recorded using a video camera to assess the dispersion of the aerosol qualitatively. In the meantime, the concentration of the aerosol particles was measured using a particle meter to evaluate the effectiveness of the extraction quantitatively. It was found that the HFLE device could effectively reduce the dispersion of the exhaled aerosols to undetectable levels when it was positioned within 250 mm from the mouth. This result has significance in the safety of HCWs involved in the management of patients with infectious diseases and may also have potential applications in other clinical areas with high airflow in the ventilation systems.
Publisher: IGI Global
Date: 04-2016
Abstract: This paper provides new empirical evidences on determinants of cost efficiency and productivity performance of life and property-casualty insurance firms in Indonesia. Data envelopment analysis (DEA) method is used to investigate the cost efficiency and Total Factor Productivity (TFP) among a balanced panel of 118 insurance firms (35 life insurance and 83 property-casualty insurance) over the period of 2006-2008. Results show that on average, insurers were operating at a low level of cost efficiency. However, by constructing the Malmquist Indices, this research finds a positive productivity change for the two types of insurance firms due to an increasing use of technological advances. Furthermore, the paper estimates the influence of some environmental variables on the cost efficiency using a multiple regression analysis. New findings indicate significant negative effects among types of insurance, size, and solvency on the firm's cost efficiency. Meanwhile, market share and ownership structure have positive but insignificant effects on the firms' efficiency. These findings are additional empirical evidences for the efficiency analysis of life and property-casualty insurance in a developing country.
Publisher: Elsevier BV
Date: 05-2022
Publisher: The University of Queensland
Date: 11-12-2020
DOI: 10.14264/3EB5472
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 06-2021
Publisher: MDPI AG
Date: 17-08-2022
DOI: 10.3390/JMSE10081128
Abstract: The effects of yaw angle on wake characteristics of a stationary square cylinder were investigated in terms of the hydrodynamic forces, the vortex shedding frequency, and the vortical structures using direct numerical simulations (DNS) at a Reynolds number of 1000. In total, four yaw angles, namely, α = 0°, 15°, 30°, and 45°, were considered. The three-dimensional (3D) Navier–Stokes equations were solved directly using the finite volume method in OpenFOAM. It was found that the first-order statistics of the drag coefficient and the Strouhal number satisfied the independence principle (IP) closely. However, the second-order statistics of the drag and lift coefficients deviated apparently from the IP for α ≥ 25°. The iso-surfaces of the spanwise vorticity gradually disorganized and the magnitudes of the spanwise vorticity contour decreased as the yaw angle α was increased from 0° to 45°. By contrast, the streamwise vorticity iso-surfaces were found to become more organized and the magnitudes of the spanwise velocity contour became larger as a result of the increase in yaw angle, indicating the impairment of the quasi-two-dimensionality and the enhancement of the three-dimensionality of the wake flow. Extensive comparisons were also made with previous DNS results for a yawed circular cylinder, and both similarities and differences between these two kinds of cylinder wakes are discussed.
Publisher: Fakultas Ekonomi dan Bisnis Universitas Indonesia
Date: 30-10-2015
Abstract: This paper reports the sources of productivity growth of 23 Indonesian airports foryears 2006-2010. Using input slack-based productivity index (ISP), we disaggregatetotal factor productivity change into each input productivity change. Apron areaand terminal area are chosen as input variables while aircrafts’ movement is theoutput. By classifying the airports based on two operators, this study finds thatairports under the management of Angkasa Pura 1 (AP1) show higher productivitygrowth than Angkasa Pura 2 (AP2), whose growth is mainly driven by technicalprogress in apron areas. Moreover, the productivity decline of AP2 was mostlydue to inefficient use of terminal areas.
Publisher: Virtus Interpress
Date: 2015
Abstract: This study aims to examine effect of capital structure and ownership structure on firm performance. In addition, this study also examines the existence of reverse causality of the relation between capital structure and performance of firms in three ASEAN countries. We test the reverse causality hypothesis of firm performance to capital structure, which is viewed in light of two competing hypotheses: the efficiency-risk hypothesis and franchise-value hypothesis. In general, the results support the agency–cost hypothesis, and confirm reverse causality hypothesis in in the s le firms, through the existence of entrenchment effect in firms with the lowest and highest level of ownership concentration and the franchise value hypothesis.
Publisher: Springer Science and Business Media LLC
Date: 12-11-2022
Publisher: MDPI AG
Date: 03-06-2022
Abstract: The effect of triple helical grooves on the suppression of vortex-induced vibration (VIV) of a circular cylinder was investigated experimentally in a wind tunnel over Reynolds number in the range of 1 × 104 Re 4 × 104. It was found that the helical grooves were effective in suppressing VIV with the peak litude reduction of approximately 36%. In addition, the lock-on region was also reduced. To explore the mechanism for the suppression of VIV, experiments on flow structures for a stationary grooved cylinder were also conducted in a wind tunnel at a free stream velocity U∞ of 4.37 m/s, corresponding to a Reynolds number based on the bare cylinder diameter of about 3500. The data were then analyzed using the phase-averaged method to evaluate the coherent vortex structures in the wakes. The results for the stationary grooved cylinder showed that the grooves weakened vortex shedding in the near wake. In addition, the grooves also reduced the drag coefficient by 6.6%. These results help explain the reduction of VIV using helical grooves.
Publisher: Global Academy of Training and Research (GATR) Enterprise
Date: 24-06-2017
DOI: 10.35609/JBER.2017.2.3(1)
Abstract: Objective - This research aims to develop a policy framework to support household-based snack food industry in the East Sumba regency for poverty alleviation. Methodology/Technique - A qualitative method is applied to enable exploration. A benchmarking analysis with the snack food industry in Garut, West Java, also is conducted to gain insights of the success factors and challenges faced by the industry there. Findings - Most informants say that the East Sumba regency has a high production of food crops and fruit thus, it has potential to develop a household-based food industry to improve the local economy, i.e., a food and snacks industry based on raw materials such as maize, cassava, sweet potatoes, peanuts, and bananas. The regency also has a long coastline therefore, coconut, fish, and seaweed-based food industries also are a potential for development in the area. Novelty - This study findings propose a policy framework for poverty alleviation through the creation of new entrepreneurs producing local snack foods. The creation of new entrepreneurs will increase employment and it should be done by the local government must implement policies that develop the management skills in four functional management aspects, which must be supported by specific policies in community leadership, community culture and mindset, public–private partnerships, government support, and infrastructures. Type of Paper: Empirical Keywords: Poverty Alleviation Household-Based Industry Food industry East Sumba Indonesia. JEL Classification: L26, P46.
Publisher: People and Global Business Association
Date: 31-12-2022
DOI: 10.17549/GBFR.2022.27.6.1
Abstract: Purpose: This study investigates the impact of leverage deviation on the cost of equity under the specifically mentioned condition in ASEAN-5 considering the global financial crisis and the sensitivity of the cost of equity on leverage deviation. Design/methodology/approach: This study employs the Generalized Least Square (GLS) model and the dynamic panel estimation based on the two-step difference GMM to analyze the data. Findings: The regression analysis found deviated from the target leverage impact unfavorably on the firm's cost of equity. The results also show that the more sensitive the cost of equity is to the leverage deviation from the target, the faster the adjustment. However, firms will adjust their capital structure for a lower cost during the crisis. Additionally, it shows a compelling behavior in the relation between the sensitivity of the cost of equity to leverage deviation on the leverage speed of adjustments. Research limitations/implications: The higher sensitivity of the cost of equity is to the leverage deviation from the target, the faster the adjustment. It implies that the disregard of heterogeneity in SOA will mislead the adjustment period to the target leverage. Originality/value: Using manually collected data, this study provides empirical evidence on the importance of leverage deviation and the sensitivity of the cost of equity and the speed of adjustment to the target debt level to analyze capital structure decision in an enormous leverage usage in ASEAN. Second, this paper presents new evidence of the effect both in normal economic conditions and crisis periods, which is rarely examined in the ASEAN emerging market.
Publisher: Elsevier BV
Date: 04-2023
Publisher: Informa UK Limited
Date: 19-09-2019
Publisher: AIP Publishing
Date: 08-2021
DOI: 10.1063/5.0059089
Abstract: This work examined the development of the large-scale vortex structures in the wake of two screen cylinders with porosities β = 48% and 61% in the intermediate region at a Reynolds number of 7000 using two X-type hot-wire probes. The screen cylinders were made of stainless steel screen meshes rolled into a cylindrical shape. The results were compared with those of a solid cylinder (β = 0%) under the same flow conditions. It was shown that the formation of the large-scale vortices in the screen cylinder wakes involves different mechanisms. For the screen cylinder with β = 48%, they were generated due to wake instability (Kármán vortex), which closely resembled that of a solid cylinder. In contrast, for the screen cylinder with β = 61%, the vortices were formed owing to the shear-layer (Kelvin–Helmholtz) convective instability. These findings were justified by the streamwise evolution of the vortex shedding frequency, a stability analysis in the near wake using the mean streamwise velocity profiles, and the coherent and incoherent wake structures obtained by the phase-averaged analysis at different downstream locations.
Publisher: The University of Queensland
Date: 11-12-2020
DOI: 10.14264/23C4C62
Publisher: Southwest Jiaotong University
Date: 30-06-2022
DOI: 10.35741/ISSN.0258-2724.57.3.38
Abstract: There is an intense debate on the effectiveness of the village fund program initiated by the Indonesian government. This paper examines the program's effectiveness in improving the quality of life and community well-being in rural areas from the villagers' perspective. Few studies have investigated the program's impacts from an in idual perspective using primary data. Thus, this is the first study that analyzes the influence of the perceived management of the village fund program and community trust on community engagement and in iduals' perceptions of the quality of life and community well-being. This study collected primary data by surveying 200 households in four sub-districts of the Lebak Regency in Banten Province in Indonesia. The survey data were analyzed using partial least squares structural equation modeling (PLS-SEM) with SmartPLS software. Results show that the perceived management of a village's funds directly affects the villagers' perception of quality of life and community well-being. The perceived village fund management also provides a significant path to community engagement. The paper concludes that the government should consider including the community in its village development program, thus increasing the residents' perceived quality of life and ensuring the program's success. This study contributes to the recent literature by providing new evidence about the impact of the village fund program on quality of life and community well-being using primary data at the household level.
Location: Indonesia
No related grants have been discovered for Chenlin Sun.