Judul: Algoritma line clipping dengan memanfaatkan ruang semi dual
Abstrak: Ada beberapa algoritma line clipping yang menggunakan poligon sebagai pembatas, antara lain: algoritma Modified Cyrus-Beck (MCB), algoritma Dual Space (DS), dan algoritma Semi Dual Space (SDS). Algoritma DS dan MCB membutuhkan N kali pengujian untuk menentukan perpotongan garis dengan sisi-sisi poligon. Seliingga semakin banyak sisi paligon (N) maka semakin besar waktu eksekusi yang diperlukan. Sedangkan algoritma SDS memanfaatkan ruang semi dual untuk melakukan proses line clipping, sehingga penentuan perpotongan garis dengan sisi poligon tidak membutuhkan N kali pengujian. Dengan demikian algoritma SDS akan lebih efisien jika digunakan untuk jumlah sisi poligan yang semakin besar. Aigaritma DS dan MCB terdiri dari satu tahap, yaitu tahap line clipping. Sedangkan algoritma SDS terdiri dari dua tahap, yaitu: tahap prakalkulasi dan tahap line clipping. Tahap prakalkulasi dilakukan satu kali dan tahap line clipping dilakukan sebanyak jumlah garis dan ulangan. Namun prakalkulasi memerlukan banyak komputasi sehingga dapat memperiambat proses line clipping secara keseluruhan. Pengaruh prakalkulasi dapat dibuat sekecil mungkin dengan pemilihan jumlah partisi yang sesuai.
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Judul: Metode Simpleks Dual dan Titik Interior dalam Pemrograman Linear Menggunakan MATLAB
Abstrak: Terdapat banyak metode untuk menyelesaikan masalah pemrograman linear, di antaranya metode simpleks dual dan metode titik interior. Metode simpleks dual mendapatkan solusi optimal dengan melintasi simpul antar kendala pada daerah yang tidak fisibel bergerak menuju titik optimal pada daerah fisibel. Metode titik interior mendapatkan solusi optimal pada daerah fisibel dengan menentukan titik Kata kunci: MATLAB, pemrograman linear, simpleks dual, titik interior interior dan kemudian bergerak menuju ke arah yang lebih dekat ke nilai optimal fungsi tujuan. Running time merupakan salah satu hal yang sangat penting pada saat melakukan pengkodingan sebuah program, terutama yang berkaitan dengan efisiensi program ketika dijalankan. Tulisan ini memperlihatkan perbandingan waktu eksekusi antara metode simpleks dual dan metode titik interior dalam masalah pemrograman linear menggunakan MATLAB. Hasil yang diperoleh menunjukkan bahwa metode titik interior selalu lebih cepat dibandingkan dengan metode simpleks dual.
Keyword: MATLAB, pemrograman linear, simpleks dual, titik interior

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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