Judul: Perbaikan dan evaluasi kinerja algoritma read-commit order concurrency control (ROCC)
Abstrak: Concurrency control (CC) merupakan suatu mekanisme untuk mengatur eksekusi transaksi-transaksi yang terjadi dalam basis data. CC data produk komersial menggunakan Strict Two Phase Locking (Strict 2PL). Strict 2PL masih mempunyai masalah yang disebut dengan deadlock. Lead-commit Order Concurrency Control (ROCC) merupakan sauatu CC baru yang diharapkan dapat memberikan kerja yang tinggi dan memperbaharui CC yang telah ada.
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Judul: Perbandingan algoritma obermarck dan chandy-misra dalam penanggulangan deadlock terdistribusi
Abstrak: Deadlock adalah keadaan dimana sejumlah permintaan yang tidak bisa dijalankan oleh scheduler karena permintaan-permintaan tersebut saling tunggu menunggu. Deadlock adalah masalah utama dalam penggunaan data secara bersama-sama. Pada sistem basis data terdistribusi sering terjadi deadlock antar transaksi, terutama pada sistem yang menggunakan concurrency control berbasis locking. Ada berbagai cara untuk menangani deadlock, yaitu dengan pencegahan, penghindaran, dan pendeteksian. Masing-masing memiliki kelebihan dan kekurangan. Pencegahan dan penghindaran deadlock bersifat konservatif dan pesimistik, sehingga lebih banyak peneliti yang tertarik untuk menemukan algoritma pendeteksian deadlock. Pendeteksian deadlock ini dapat dilakukan secara terdistribusi. Algoritma Obermarck dan Chandy-Misra termasuk ke dalam algoritma pendeteksi deadlock terdistribusi yang bermodel AND. Informasi tentang transaksi yang sedang menunggu digambarkan dalam WFG(Wait For Graf). Performa kedua algoritma ini dibandingkan dengan menggunakan simulasi. Kriteria yang dibandingkan adalah lamanya deadlock (Deadlock Persistent Time/DPT) dalam sistem dan lamanya waktu komunikasi untuk memelihara WFG (WFG's Maintenance Time). Deadlock bertahan dalam sistem lebih lama pada algoritma Obermarck. Dengan adanya deadlock ini, performa sistem akan berkurang. Algoritma Obermarck lebih banyak melakukan komunikasi untuk memelihara WFG. Oleh karena itu, dilihat dari lamanya deadlock dalam sistem dan banyaknya komunikasi untuk memelihara WFG, dapat disimpulkan algoritma Chandy-Misra lebih baik daripada algoritma Obermarck.
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Judul: Biology and ecology of the buffalo fly, haematobia exigua de meijere (diptera:muscidae)
Abstrak: The life history of the buffalo fly was observed at room temperature of 27°-29.5°C and at a relative humidity of 48-68 percent. The eggs hatched after 17-22 hours, with an average of 18 hours. First instar larvae measured 1.25 + 0.16 mm long and 0.27 + 0.037 mm wide. reach the second larval stage. It took 6-12 hours to the second instar larvae measured 2.676 +0.187 mm long and 0.353 +0.028 mm wide. The second instar took about 12-24 hours to reach the third larval stage. The third instar measured 6.833 + 0.189 mm long and 0.919 + 0.051 mm wide. It took about 2-3 days for the third instar to become pupae. Duration of the pupal stage was about 5-7 days before the adults emerged. Under laboratory condition, the buffalo fly completed its life cycle in 9.5 to 10.5 days, whereas under field condition it took 9-14 days with an average of 10.5 days. The growth ratio which was based on the measurements of the cephalo-pharyngeal skeleton of each instar was 1.797. The preoviposition period was 8-12 days and mating usually occurred on the 6th or 7th day. The longevity of the male was 29 days, whereas it was 32 days in the female. The range of egg production under laboratory condition was between 20-139 per female fly. The belly and hind legs of the carabao were the most preferred habitat either during cloudy and cool dry or shiny and warm day. When the weather was clear and the carabao was in the shade, the flies tended to be more distributed particularly on the shoulder, dewlap, back and horns. The carabaos had relatively fewer Musca sp. and Stomoxys calcitrans than cattle; never the less carabaos had a higher infestation of buffalo fly than cattle. Oviposition occured either during the day or night but the buffalo flies were more active during the night than in the day time. The effect of various lengths of exposure time of manure in relation to the oviposition was profound. observed, the maximum number of the buffalo flies was occurred when the dung was exposed for 30 minutes. With increasing time of exposure the number and variety of insects also increase. It was evident that Sepsidae and psychodidae were the most dominant insects emerging from the dung. The number of buffalo flies also increased with increasing
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