Judul: Pemodelan Simulasi Pengelolaan Rutan Alam Produksi Lestari di PT. Sari Bumi Kusuma Kalimantan Tengah
Abstrak: Sustainable management of natural production forests should pay attention to economic adjust, ecological and social. Production is influenced by the security of land where trees grow in the absence of forest disturbance such as encroachment, shifting cultivation and fires that reduce the production company. If only in the form of forest disturbance shifting the wider fields tolerance is 1.01 hectares/ household, and 18.2 acres/household only if the encroachment. If only fires tolerance 185.53 hectares/year. When considering these three factors, the widespread tolerance of 0.78 acres of farm/household, clearing 0.67 acres/family and fires 181 acres/year. Income if the company manages timber only increased to Rp36 947 078 301 at the end of the concession period. If only utilize NTFPs income of Rp628 995 658 174 and Rp665 942 736 475 if a combination of both. Income when fully manage NTFPs Rp733 603 161 612, whereas if the labor of Rp3 168 503 438.
Keyword: sustainable forest management, NTFPs, income, forest disturbance

Judul: Pemodelan Simulasi Pengelolaan Hutan Alam di PT Suka Jaya Makmur
Abstrak: Forest product is consists of timber, non-timber forest products and environmental services. Currently, utilization of forest resources in the PT Suka Jaya Makmur is only focusing on timber utilization, while the non-timber forest products is one of potential forest product that increase company's revenue and the welfare of community around forest. The purpose of this research is to make simulation model of timber product management and non-timber forest product utilization is not the time to predict the revenue of company and community with a variety of forest management scenarios. Simulation modeling in this study is using system modeling approach. System modeling is using complex component from the real world and it is simplified so that it can be modeled for a particular purpose. Based on the simulation results, the best scenario is scenario modeling 3 because it produces the greatest revenue. Scenario 3 about the company is managing timber and non-timber forest products as well as a community as worker. Income is earned by the company until the end of the concession period in 2054 if managing timber and non-timber is Rp 447 614 560 712 while the community revenue is Rp 180 852 937 with the average income/family is Rp 10 114 117/year.
Keyword: Bogor Agricultural University (IPB), revenue, simulation models, non-timber forest products

Judul: Perbandingan Algoritma Message Digest 5 (MD5) Dan Secure Hash Algorithm 1 (Shai) Untuk Autentikasi Pesan
Abstrak: Seiring dcngan meningkatnya penggunaan internet sebagai media pertukaran pcsan. metodc pcngamanan pcsan menjadi sangat penting. Nilai suatu pesan yang ingin dijaga keutuhan atnu intcgritasnya menycbabkan pesan tcrscbut hanya baleh dimodifikasi olch pihak yang bcrhak. Namun pada rcalitanya, pesan tersebut akan mendapat ancaman dari scorang penyusup. Bentuk ancaman terjadi apabiJa pcnyusup dcngan suatu cara. dapat mengubah isi pesan terscbut untuk bcrbagai kepcntingan. Apabila isi pesan telah bcrubah dad bentuk aslinya, maka pesan terscbut dikatakan sudah tidak aulcnlik (asli) Iagi. Snatn metodc yang efektif untuk mcnguji kcautentikan suatll pesan digllnakan tcknik kriptografi. Pada kal)'a ilmiah ini akan dibahas algoritma Message Digest 5 (MDS) dan Secure !-lash Algorithm (SHAI) untuk autentikasi pesan.
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