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DERMAWAN, B.,HUDA, I.N.,WIBOWO, R.W.,HIDAYAT, T.,UTAMA, J.A.,MANDEY, D.,TAMPUBOLON, I. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
This work considers the elliptic restricted three-body problem under effects of radiation of the bigger primary, and an oblate spheroid for the smaller primary to mimic an exoplanetary system with a gas giant planet. Under the influences of both effects we look for the existence of the triangular equilibrium points and the influences of the radiation and oblateness on the locations and motion of the points. We set the system in a normalized rotating coordinate system and derive equations of motion for the third infinitesimal object. Our study shows that the effects modify the equilateral/isosceles triangle shape with respect to the primaries. The triangular points also have non-planar motion with period depending on the value of the planet oblateness.
Asymmetric Information on Online Transportation Partnership
Dodi DERMAWAN,Khusnul ASHAR,Iswan NOOR,Asfi MANZILATI 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6
The concept of sharing economy is still under debate among experts. Online transportation companies use the concept of a sharing economy with a partnership pattern. The pattern used in such a partnership is different from the common ones. Several studies have found information asymmetry and unbalanced relationships in the partnership. This study aims to identify information asymmetries in online transportation partnerships in Indonesia. Using a qualitative approach with interactive analysis, the informants are online transportation drivers in Malang City. This study finds that drivers have received asymmetric information in terms of order, bonus, and sanctions. Furthermore, they are not the partners of the companies; instead, they are application users, just as customers. All rules and policies are made by the company without involving a driver. Drivers can only accept all policies from the company if they wish to join the partnership. The implication that occurs to the driver causes the driver to lose bargaining power as a partner. However, their income is higher than that before joining the company. The sustainability and future of the driver are very unstable due to the ever-changing rules of the company. Driver loyalty is also considered very low. In light of this trend, the government should enact legislation that spells out the rights and responsibilities of parties involved in online transportation partnerships.
HUDA, IBNU NURUL,DERMAWAN, BUDI,WIBOWO, RIDLO WAHYUDI,HIDAYAT, TAUFIQ,UTAMA, JUDHISTIRA ARYA,MANDEY, DENNY,TAMPUBOLON, IHSAN The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
This study deals with the generalization of the Elliptic Restricted Three-Body Problem (ER3BP) by considering the effects of radiation and oblate spheroid primaries. This may illustrate a gas giant exoplanet orbiting its host star with eccentric orbit. In the three dimensional case, this generalization may possess two additional equilibrium points ($L_{6,7}$, out-of-plane). We determine the existence of $L_{6,7}$ in ER3BP under the effects of radiation (bigger primary) and oblateness (small primary). We analytically derive the locations of $L_{6,7}$ and assume initial approximations of (${\mu}-1$, ${\pm}\sqrt{3A_2}$), where ${\mu}$ and $A_2$ are the mass parameter and oblateness factor, respectively. The fixed locations are then determined. Our results show that the locations of $L_{6,7}$ are periodic and affected by $A_2$ and the radiation factor ($q_1$).