Judul: Analysis of M/M/1 Queue System with Continuous Service
Abstrak: Sistem antrean M/M/1 dengan pelayanan kontinu adalah sistem antrean di mana waktu pengiriman dan layanan secara independen dan menyebar secara eksponensial dengan satu server, sehingga server melayani pelanggan saat pelanggan berada di dalam sistem. Untuk mencapai karakteristik tersebut, diasumsikan di dalam sistem tersebut ada dua jenis pelanggan, yaitu pelanggan nyata dan pelanggan imajiner. dst..., The M/M/1 queueing system with continuous service is a queuing system where delivery and service times are independent and exponentially distributed with one server, so that the server serves the customer while the customer is in the system. To achieve the mentioned characteristics, it is assumed in the system there are two types of customers, namely real customers and imaginary customers. dst...
Keyword: expected value, exponentially, probability density function, queue

Judul: Analisis Model Antrean Berulang M/G/1 dengan Prioritas Preemptive Resume dan Collisions pada Kerusakan Server dan Penundaan Perbaikan
Abstrak: Sistem antrean M/G/1 adalah sistem antrean dengan proses kedatangan pelanggan berdistribusi Poisson, waktu layanan pelanggan berdistribusi umum, dan server tunggal. Pada karya ilmiah ini, terdapat dua jenis pelanggan yaitu pelanggan positif dan negatif. Pelanggan positif akan dilayani seperti biasa oleh server dan diambil dari antrean sesuai dengan disiplin yang ditentukan, sedangkan pelanggan negatif yang tidak mendapat pelayanan mengakibatkan kerusakan pada server dan dapat menghapus pelanggan yang ada dalam layanan pada sistem. Disiplin antrean yang digunakan dalam model ini adalah disiplin prioritas preemptive. Dengan menyelesaikan persamaan diferensial untuk fungsi pembangkit peluang dalam kondisi steady-state, diperoleh peluang lama server sedang menganggur, sibuk melayani pelanggan, menunggu perbaikan, dan sedang dalam perbaikan, serta ukuran kinerja lainnya. Kemudian, diperoleh juga nilai harapan periode sibuk., The M/G/1 queue system is a queue system with arrival process of customers follows Poisson process, customer service time has a general distribution, and has single server. In this manuscript, there are two types of customers, namely positive and negative customers. The positive customers are treated in the normal way by a server and are taken from a queue according to the specified queueing system, while the negative customer, which does not receive service, causes the server breakdown and removes the customer being in service from the system. The queue discipline used in this model is preemptive resume priority. By solving the differential equation for the probability generating function in steady-state condition, the probability that the server is idle, busy serving a customer, waiting for repair and under repair, and other performance measure was obtained. Finally, the expected value of busy period was obtained as well.
Keyword: expected value, Poisson, probability, retrial queue

Judul: Hepatoprotector  Potential  of  Rosella  Extract  (Hibiscus  sabdariffa  L)  on  The  Liver  of  Paracetamol-induced  rats.
Abstrak: Paracetamol is one of the most common analgesic and antipyretic for relieving headache and fever. Prolonged use of paracetamol in high dose can produce liver necrosis and damage the kidney. Rosella (Hibiscus sabdariffa L) has the ability to prevent liver necrosis. Therefore, the aim of this research was to determine the hepatoprotector effects of water extract of Rosella in lowering the transaminase acitivity and to examine its ability in regenerating the necrosis of hepatocyte on rats induced by high dose of paracetamol. The change in liver function was determined by microsopical observation with AST (aspartat transaminase) and ALT (alanin transaminase) level. AST and ALT Enzyme analysis was performed using IFCC method. Preparates for histopathology assay were made using modified Andrew Kent method. The induction of rosella water extract with dosage of 1,1 g/mL extract/kg BW, 3,3 g/mL extract/kg BW, and 5,5 g/mL extract/kg BW can lower the ALT activity on 35th day for 61,90%, 62,52%, and 63,27% and AST activity on 35th day for 61,90%, 62,52%, and 63,27% respectively. Observation on histopatology showed that treatment with 1,1 g/mL extract/kg BW had better ability to regenerate hepatocyte compared with both 3,3 g/mL extract/kg BW and 5,5 g/mL extract/kg BW.
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