Judul: Optimalisasi Penempatan Access Point di Gedung Graha Widya  Wisuda IPB University
Abstrak: Covering-based model merupakan suatu permasalahan penentuan lokasi yang bertujuan meminimumkan jumlah titik lokasi fasilitas pelayanan, tetapi dapat melayani semua titik permintaan. Dalam penelitian ini akan dibahas penentuan lokasi access point di gedung Graha Widya Wisuda IPB University. Kendala yang dimiliki oleh permasalahan ini adalah terdapat beberapa tipe access point dengan jarak jangkauan dan harga yang berbeda-beda. Penentuan lokasi access point ini akan diselesaikan menggunakan model set covering problem dengan bantuan software LINGO 19.0. Hasil implementasi menghasilkan titik alternatif penempatan yang terpilih adalah titik I1, I5, I8, I9, I11, I12, dan I16, dengan total biaya sebesar Rp 65.550.000,00., The covering-based model is a location determination problem aimed at minimizing the number of service facility locations while serving all demand points. This research will discuss the determination of access point locations in the Graha Widya Wisuda building at IPB University. The constraint faced by this problem is the existence of several types of access points with different ranges and prices. The determination of access point locations will be solved using the set covering problem model with the assistance of LINGO 19.0 software. The implementation results in the selection of alternative placement points, namely I1, I5, I8, I9, I11, I12, and I16, with a total cost of Rp 65,550,000.00.
Keyword: access point, covering-based model, set covering problem

Judul: Quality of Service (QoS) Analysis of the IPB Access Internet Network at the Department of Computer Science Institut Pertanian  Bogor
Abstrak: Institut Pertanian Bogor menyediakan fasilitas internet IPB-Access untuk kegiatan akademik, sehingga quality of service (QoS) diperlukan untuk mengevaluasi jaringan di Departemen Ilmu Komputer untuk meningkatkan kualitasnya. Penelitian ini menggunakan Wireshark untuk mengukur throughput, delay, jitter, dan packet loss di selasar mahasiswa, ruang dosen, dan pascasarjana dengan skenario streaming YouTube, mengunduh dan mengunggah file, Zoom meeting, dan browsing LMS. Hasilnya menunjukkan sebagian besar parameter berdasarkan standar TIPHON termasuk dalam kategori sangat baik, kecuali di selasar mahasiswa dan ruang dosen, parameter jitter skenario YouTube dan LMS termasuk dalam kategori sedang dan buruk karena interaksi dari pengguna. Rataan throughput ketiga lokasi pada download dan upload sebesar 20.5 Mbps dan 13.5 Mbps. Rataan delay dan jitter skenario Zoom adalah 5.5 ms dan 26.9 ms. Hasil survey terhadap 50 mahasiswa menunjukkan kecepatan koneksi memiliki rataan skala Likert sebesar 3.04 (cukup) dan kemudahan akses sebesar 3.32 (cukup baik). Jaringan Wi-Fi IPB-Access memiliki parameter QoS yang baik, meskipun menurut survey kecepatan dan kemudahannya masih dinilai cukup oleh mahasiswa., IPB University provides IPB-Access internet facilities for academic activities, so quality of service (QoS) is needed to evaluate the network condition in the Department of Computer Science to improve its quality. This research used Wireshark to measure throughput, delay, jitter, and packet loss in student hallways, lecturer rooms, and postgraduate areas with YouTube streaming, file download and upload, Zoom meetings, and LMS browsing. TIPHON-based parameters are mostly rated very good, except for medium jitter in student hallways and lecturer rooms during YouTube, and poor LMS due to the interactivity nature of the applications. Average throughput is 20.5 Mbps in download and 13.5 Mbps in upload. In the Zoom scenario, average delay is 5.5 ms and jitter is 26.9 ms. A survey of 50 students rated connection speed at 3.04 (fair) and ease of access at 3.32 (fairly good). IPB Access Wi-Fi network has good QoS parameters, although according to surveys its speed and convenience are still considered sufficient by students.
Keyword: internet, IPB-Access, network analysis, quality of service, Wi-Fi

Judul: Mercury Toxicity and It’s Effect on Histopathology Change of Nile Tilapia (Oreochromis niloticus).
Abstrak: Nile tilapia (Oreochromis niloticus) is one of fish species that oportunity to contaminated with mercury. The effects of pollutants can damage living organisms organs and can cause death. The effects caused mercury had acute or chronic character. The aims of this study are to determine threshold and acute toxicity of mercury chloride (HgCl2) of Nile tilapia (Oreochromis niloticus), to assess the effect of mercury chloride (HgCl2) on several biometric parameters (survival, growth rate of average daily weighted, liver condition, bile and reproductive variability of Nile tilapia (Oreochromis niloticus), assess the level of damage to the histological structure of the gills, liver and kidney of Nile tilapia (Oreochromis niloticus) caused mercury chloride (HgCl2) exposure. This study was conducted from February to June 2013. Nile Tilapia (Oreochromis niloticus) were used in this study were female with average weight 20 grams or 11-13 cm length range. Toxicant materials used in this study was mercury chloride (HgCl2). Fish were reared in each aquarium 60x40x30 containing 48 liters of water. This study consists of three stages: a preliminary test, acute test, and sub-chronic test. To determine the changes in biometric condition of tilapia approximated by measuring the survival rate (SR), the growth rate of average daily weight , the content of mercury in the fish organs, hepatosomatic index (HSI), the relative bile volume (VER), gonadal soamtic index (IKG), fecundity and oocit diameter, tissue damage caused by mercury in fish organs by making histological preparations stained with hematoxylin and eosin. The median lethal concentration (96 hr, LC50) of Mercury Chloride was calculated as 1,64 mgL--1.The survival rate was highest in the control treatment (46,67 %) . Mercury chloride with concentration 0.196 mgL--1 show significant effect to changes HSI and relative bile volume, and oocyte diameter of Nile tilapia (p < 0,05). Mercury chloride with a concentration of 0,164 mgL-1 and 0,196 mgL-1 have not a significant effect on the growth rate of weight, gonadal somatic index and fecundity of Nile tilapia (p > 0,05). Mercury chloride cause damage to gills (hyperplasia, hypertrophy, proliferation and neukrosis), liver (hyperplasia, hemorhage, shrinkage of hepatocytes, proliferation and neukrosis) and kidney (hyperplasia, hemorrhage, shrinkage of the glomerulus, proliferation and neukrosis).
Keyword: Nile tilapia, Hepatosomatic indexs (HSI), histopathology