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MENCARI PEMECAHAN MASALAH PENYATUAN ETNIK TIONGHOA DALAM BANG DAN NEGARA INDONESIA
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| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Bina Darma |
| Volume / Edisi | : | 16-60,- (No. 60) |
| Halaman | : | 99-120 |
| Abstrak | : | - |
BIFURCATION ANALYSIS IN A TUMOR-IMMUNE SYSTEM INTERACTION MODEL WITH DENDRITIC CELL THERAPY AND IMMUNE RESPONSE DELAY
| Pengarang | : | Zhang, Yuyue [et al...] |
| Nama Majalah/Jurnal | : | Siam Journal On Applied Mathematics |
| Volume / Edisi | : | 83 (No. 5) |
| Halaman | : | 1892-1914 |
| Abstrak | : | In this paper, we study a tumor-immune system interaction model with dendritic cell therapy and immune response delay. First, it is shown that the ODE version of the model has a Bogdanov-Takens (BT) singularity or a weak focus with multiplicity at most 1 for different parameter values. As the parameters vary, the ODE model undergoes supercritical Hopf bifurcation and supercritical BT bifurcation. Our analysis indicates that there exists a threshold value of the activation rate of T cells, below which tumor immune escape occurs, above or at which T cells and tumor cells coexist in the form of a stable periodic oscillation or steady state. Second, we study how the immune response delay affects the dynamics of the model. Our results reveal that the delay can destabilize the stable positive equilibrium through Hopf bifurcation. Furthermore, the direction and stability of Hopf bifurcation are derived. When there is a cusp, we show that it is a BT singularity for any delay and the delay model also undergoes BT bifurcation. Finally, numerical simulations are presented to illustrate the theoretical results. |
Nonparametric Bayesian Instrumental Variable Analysis: Evaluating Heterogeneous Effects of Coronary Arterial Access Site Strategies
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Journal of the American Statistical Association |
| Volume / Edisi | : | 115 (No. 532) |
| Halaman | : | 1635-1644 |
| Abstrak | : | Percutaneous coronary interventions (PCIs) are nonsurgical procedures to open blocked blood vessels to the heart, frequently using a catheter to place a stent. The catheter can be inserted into the blood vessels using an artery in the groin or an artery in the wrist. Because clinical trials have indicated that access via the wrist may result in fewer post procedure complications, shortening the length of stay, and ultimately cost less than groin access, adoption of access via the wrist has been encouraged. However, patients treated in usual care are likely to differ from those participating in clinical trials, and there is reason to believe that the effectiveness of wrist access may differ between males and females. Moreover, the choice of artery access strategy is likely to be influenced by patient or physician unmeasured factors. To study the effectiveness of the two artery access site strategies on hospitalization charges, we use data from a state-mandated clinical registry including 7963 patients undergoing PCI. A hierarchical Bayesian likelihood-based instrumental variable analysis under a latent index modeling framework is introduced to jointly model outcomes and treatment status. Our approach accounts for unobserved heterogeneity via a latent factor structure, and permits nonparametric error distributions with Dirichlet process mixture models. Our results demonstrate that artery access in the wrist reduces hospitalization charges compared to access in the groin, with a higher mean reduction for male patients. |
PRIBUMI DAN NON-0PRIBUMI BENARKAH ADA?
| Pengarang | : | Eddy Sadeli |
| Nama Majalah/Jurnal | : | Bina Darma |
| Volume / Edisi | : | 16-60,- (No. 60) |
| Halaman | : | 92-98 |
| Abstrak | : | - |
UNCOVERING A TWO-PHASE DYNAMICS FROM A DOLLAR EXCHANGE MODEL WITH BANK AND DEBT
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Siam Journal On Applied Mathematics |
| Volume / Edisi | : | 83 (No. 5) |
| Halaman | : | 1872-1891 |
| Abstrak | : | We investigate the unbiased model for money exchanges with collective debt limit: agents give at random time a dollar to one another as long as they have at least one dollar or they can borrow a dollar from a central bank if the bank is not empty. Surprisingly, this dynamic eventually leads to an asymmetric Laplace distribution of wealth (conjectured in [N. Xi, N. Ding, and Y. Wang, Phys. A, 357 (2005), pp. 543-555] and shown formally in a recent work [N. Lanchier and S. Reed, J. Stat. Phys., 176 (2019), pp. 1115-1137]). In this manuscript, we carry out a formal mean-field limit as the number of agents goes to infinity where we uncover a two-phase ODE dynamic. Con vergence towards the unique equilibrium (two-sided geometric) distribution in the large time limit is also shown and the role played by the bank and debt (in terms of Gini index or wealth inequality) will be explored numerically as well. |
PANDANGAN ETNIS TIONGHOA TENTANG INDONESIA
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Bina Darma |
| Volume / Edisi | : | 16-60,- (No. 60) |
| Halaman | : | 87-91 |
| Abstrak | : | - |
THE BCC LATTICE IN A LONG-RANGE INTERACTION SYSTEM
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Siam Journal On Applied Mathematics |
| Volume / Edisi | : | 83 (No. 5) |
| Halaman | : | 1854-1871 |
| Abstrak | : | While the hexagonal lattice is ubiquitous in two dimensions, the body centered cubic lattice (BCC lattice) and the face centered cubic lattice are both commonly observed in three dimensions. A geometric variational problem motivated by the diblock copolymer theory consists of a short-range interaction energy and a long-range interaction energy. In three dimensions, and when the long range interaction is given by the nonlocal operator ( - \Delta ) - 3/2, it is proved that the BCC lattice is the preferred structure |
CITRA INDONESIA DALAM PERSPEKTIF ETNIS TIONGHOA
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Bina Darma |
| Volume / Edisi | : | 16-60,- (No. 60) |
| Halaman | : | 79-86 |
| Abstrak | : | - |
MINIMIZING CONGESTION IN SINGLE-SOURCE, SINGLE-SINK QUEUEING NETWORKS
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Siam Journal On Applied Mathematics |
| Volume / Edisi | : | 83 (No. 5) |
| Halaman | : | 1832-1853 |
| Abstrak | : | Motivated by the modeling of customer mobility and congestion in supermarkets, we study queueing networks with a single source and a single sink. We assume that walkers traverse a network according to an unbiased random walk, and we analyze how network topology affects the total mean queue size Q, which we use to measure congestion. We examine network topologies that minimize Q and provide proofs of optimality for some cases and numerical evidence of optimality for others. Finally, we present greedy algorithms that add edges to and delete edges from a network to reduce Q, and we apply these algorithms to a network that we construct using a supermarket store layout. We find that these greedy algorithms, which typically tend to add edges to the sink node, are able to significantly reduce Q. Our work helps improve understanding of how to design networks with low congestion and how to amend networks to reduce congestion. |
BASIC REPRODUCTION RATIOS FOR TIME-PERIODIC HOMOGENEOUS EVOLUTION SYSTEMS
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Siam Journal On Applied Mathematics |
| Volume / Edisi | : | 83 (No. 5) |
| Halaman | : | 1806-1831 |
| Abstrak | : | This paper is devoted to the study of basic reproduction ratios \scrR 0 for time-periodic homogeneous evolution systems. We introduce the definition of \scrR 0 and show that the sign of \scrR 0 - 1 determines the stability of the zero solution for such a system. We also characterize \scrR 0 and give a numerical method to compute it. Then we apply the developed theory to two population models and obtain threshold type results on their global dynamics in terms of \scrR 0. |