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INDONESIA
Jurnal Informatika
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Articles 9 Documents
Search results for , issue "Vol 8, No 1 (2007): MAY 2007" : 9 Documents clear
SISTEM REKOMENDASI INDEKS WEB DENGAN METODE FREQUENT TERMS BERBASIS MULTI INSTANCE LEARNING Herumurti, Darlis; Buliali, Joko Lianto; Andriana, Ria
Jurnal Informatika Vol 8, No 1 (2007): MAY 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (152.253 KB) | DOI: 10.9744/informatika.8.1.pp. 10-17

Abstract

Web index page is well known as page that arranges information by giving the title and short explanation about the information, where the complete information will be presented in other page. However since the amount of information become accumulate, the existence of a lot of index page exactly cause difficulty on getting information because it is possible to direct users into a mount of irrelevant information. Without a system which can help user navigation, the process of seeking the expected information is equal to a trial and error processing. In this paper, web index recommendation system is investigated which involved the activity of user on accessing the index page. This system will arrange the frequent term in index page and then implement Multi Instance Learning to give recommendation of the new index page automatically. The algorithm is citation kNN that will be adapted into fretCit kNN by implementing the minimal Hausdorff distance in measuring the distance. The experiments show that from the several test of users, the system give performance in average recommendation until 82,41% accuracy with 66,71% recall. Abstract in Bahasa Indonesia : Halaman indeks dikenal sebagai halaman yang mengelompokkan informasi-informasi, dengan memberikan judul serta penjelasan singkat tentang suatu informasi, dimana informasi lengkap akan dipresentasikan pada halaman-halaman lain. Namun dengan ketersediaan informasi yang menjadi semakin menumpuk, keberadaan halaman indeks yang semakin banyak justru menyebabkan kesulitan dalam mendapatkan informasi karena mungkin akan mengarahkan pada banyak informasi yang tidak relevan. Tanpa adanya sebuah sistem yang dapat membantu navigasi user, untuk mencari informasi yang diinginkan sama saja dengan sebuah kegiatan trial dan error. Dalam penelitian ini, dirancang sebuah sistem rekomendasi indeks web yang melibatkan aktifitas user dalam mengakses halaman indeks. Sistem ini mengelompokkan frequent terms pada halaman indeks dan kemudian mengimplementasikan metode Multi Instance Learning untuk memberikan rekomendasi secara otomatis dari halaman-halaman indeks baru. Algoritma yang digunakan adalah algoritma Citation kNN yang diadaptasi menjadi fretCit-kNN dengan mengaplikasikan minimal Hausdorff distance dalam pengukuran jaraknya. Dalam hasil proses dan analisis disimpulkan bahwa dengan beberapa macam uji coba data dari beberapa user sistem menampilkan performa hingga rata-rata 82,41% akurasi dan nilai kembalian sebesar 66,71%. Kata kunci: halaman indeks, sistem rekomendasi, multi instance learning, citation kNN, hausdorff distance.
EXPLOITING UNLABELED DATA IN CONCEPT DRIFT LEARNING Widyantoro, Dwi Hendratmo
Jurnal Informatika Vol 8, No 1 (2007): MAY 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (183.665 KB) | DOI: 10.9744/informatika.8.1.pp. 54-62

Abstract

Learning unlabeled data in a drifting environment still receives little attention. This paper presents a concept tracker algorithm for learning concept drift that exploits unlabeled data. In the absence of complete labeled data, instance classes are identified using a concept hierarchy that is incrementally constructed from data stream (mostly unlabeled data) in unsupervised mode. The persistence assumption in temporal reasoning is then applied to infer target concepts. Empirical evaluation that has been conducted on information-filtering domains demonstrates the effectiveness of this approach.
GENERATING A SEAMLESS TILING OF A NATURE IMAGE Hartanto, Budi
Jurnal Informatika Vol 8, No 1 (2007): MAY 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1120.699 KB) | DOI: 10.9744/informatika.8.1.pp. 29-36

Abstract

Tiling is a process to create a repetitive - larger size - image. However if the picture on the left side of the original image is not continuous to the picture on its right side, the tiling image will have a virtual vertical line called seam. Meanwhile the virtual horizontal line will appear if the picture on the top side of the original image is not continuous to the picture on its bottom side. The research performed here tries to generate a seamless tiling image by finding the closest match of the fractional source image to the partially build resulted image. From the experiment, it can be shown that the quality of the resulted image are affected by the number of similar elements in the source image, the number of fractional images created from the source image, and the width of the overlap area. Source image with a lot of similar element, high number of fractional images, and wider size of the overlap area have been proven to yield a seamless tiling image.
ACCELERATION RENDERING METHOD ON RAY TRACING WITH ANGLE COMPARISON AND DISTANCE COMPARISON liliana, Liliana; Adipranata, Rudy
Jurnal Informatika Vol 8, No 1 (2007): MAY 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (475.63 KB) | DOI: 10.9744/informatika.8.1.pp. 74-78

Abstract

In computer graphics applications, to produce realistic images, a method that is often used is ray tracing. Ray tracing does not only model local illumination but also global illumination. Local illumination count ambient, diffuse and specular effects only, but global illumination also count mirroring and transparency. Local illumination count effects from the lamp(s) but global illumination count effects from other object(s) too. Objects that are usually modeled are primitive objects and mesh objects. The advantage of mesh modeling is various, interesting and real-like shape. Mesh contains many primitive objects like triangle or square (rare). A problem in mesh object modeling is long rendering time. It is because every ray must be checked with a lot of triangle of the mesh. Added by ray from other objects checking, the number of ray that traced will increase. It causes the increasing of rendering time. To solve this problem, in this research, new methods are developed to make the rendering process of mesh object faster. The new methods are angle comparison and distance comparison. These methods are used to reduce the number of ray checking. The rays predicted will not intersect with the mesh, are not checked weather the ray intersects the mesh. With angle comparison, if using small angle to compare, the rendering process will be fast. This method has disadvantage, if the shape of each triangle is big, some triangles will be corrupted. If the angle to compare is bigger, mesh corruption can be avoided but the rendering time will be longer than without comparison. With distance comparison, the rendering time is less than without comparison, and no triangle will be corrupted.
STEGANOGRAFI DENGAN CHAOTIC LEAST SIGNIFICANT BIT ENCODING PADA TELEPON GENGGAM Soplanit, Susany; Bandaria, Constantine
Jurnal Informatika Vol 8, No 1 (2007): MAY 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (222.636 KB) | DOI: 10.9744/informatika.8.1.pp. 37-41

Abstract

The issues of security in mobile phone in recent days become crucial. Many privacy or secretly data is stored using unsecured protocol or sometimes without the security procedures at all. This will lead to great awareness about security in mobile phone. The effective ways to secure data are steganography and cryptography. The first one concentrate to data hiding in a certain media. In this paper, we present Chaotic Least Significant Bit Encoding (CLSBE) as a steganography method in our system design. The experiment results show that hidden messages in PNG form can be retrieved correctly. The implementation of system in emulator works well but depends on mobile phone features and environment. Abstract in Bahasa Indonesia : Telepon genggam saat ini dapat digunakan untuk menyimpan data-data yang bersifat pribadi atau rahasia, oleh karena itu pengamanan data pada telepon genggam akan menjadi hal yang penting di masa ini ataupun di masa yang akan datang. Sistem pengamanan data yang efektif pada telepon genggam selain kriptografi adalah Steganografi yaitu penyembunyian data dalam sebuah media. Dalam perancangan ini metode yang digunakan adalah Chaotic Least Significant Bit Encoding (CLSBE). Hasil pengujian membuktikan bahwa pesan yang tersembunyi dalam citra digital dengan format PNG masih dapat diambil kembali dengan benar. Implementasi pada emulator telah berjalan dengan baik, namun untuk telepon genggam perlu penyesuaian dengan fasilitas pada telepon tersebut. Kata kunci: CLSBE, steganografi, stego-image, cover-image.
DATA MINING UNTUK KLASIFIKASI PELANGGAN DENGAN ANT COLONY OPTIMIZATION Kapiudin, Maulani
Jurnal Informatika Vol 8, No 1 (2007): MAY 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (61.942 KB) | DOI: 10.9744/informatika.8.1.pp. 68-73

Abstract

In this research the system for potentially customer classification is designed by extracting rule based classification from raw data with certain criteria. The searching process uses customer database from a bank with data mining technic by using ant colony optimization. A test based on min_case_per_rule variety and phenomene updating were done on a certain period of time. The result are group of customer class which base on rules built by ant and by modifying the pheromone updating, the area of the case is getting bigger. Prototype of the software is coded with C++ 6 version. The customer database master is created by using Microsoft Access. This paper gives information about potential customer of bank that can be classified by prototype of the software. Abstract in Bahasa Indonesia : Pada penelitian untuk sistem klasifikasi potensial customer ini didesain dengan melakukan ekstrak rule berdasarkan klasifikasi dari data mentah dengan kriteria tertentu. Proses pencarian menggunakan database pelanggan dari suatu bank dengan teknik data mining dengan ant colony optimization. Dilakukan percobaan dengan min_case_per_rule variety dan phenomene updating pada periode waktu tertentu. Hasilnya adalah sekelompok class pelanggan yang didasarkan dari rules yang dibangun dengan ant dan dengan dimodifikasi dengan pheromone updating, area permasalahan menjadi lebih melebar. Prototype dari software ini menggunakan C++ versi 6. Database pelanggan dibangun dengan Microsoft Access. Paper ini memberikan informasi mengenai potensi pelanggan dari bank, sehingga dapat diklasifikasikan dengan prototype dari software. Kata kunci: ant colony optimization, classification, min_case_per_rule, term, pheromone updating
PEMANFAATAN ENTERPRISE ARCHITECTURE PLANNING UNTUK PERENCANAAN STRATEGIS SISTEM INFORMASI Surendro, Kridanto
Jurnal Informatika Vol 8, No 1 (2007): MAY 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (897.042 KB) | DOI: 10.9744/informatika.8.1.pp. 1-9

Abstract

In the endeavor to attain its goal, an enterprise strives to undertake challenges and changes of which strategies for effective measures and efficient resource usage become necessary. To this necessity, the role of information system for supporting and enhancing enterprise performance has become more strategic and widely established. This elicits mission for information system and advises a general course of action to give a unified direction for planning, implementation and control in alignment with enterprise business strategy. A planning that identifies enterprise's information requirement and possible innovations in technology utilization for enhancing enterprise performance is a first step to begin the fulfillment of information system mission. Such a planning can be satisfied by employing Enterprise Architecture Planning methodology, which is purposed to deliver data architecture, application architecture, technology architecture and implementation plan. Implementation plan is comprised of a sequence of application development and technology platform migration / acquisition. Such a sequence is elaborated further according to business aspect as a main drive, organizational aspect which addresses people who will be involved in implementation, information system and information technology environment aspect as an interface for existing and future systems, and application development aspect which interconnects one stage in the development sequence with another. Abstract in Bahasa Indonesia : Pencapaian tujuan suatu enterprise menghadapi berbagai tantangan serta perubahan yang memerlukan strategi untuk langkah-langkah efektif dan pemanfaatan sumber daya yang efisien. Salah satu strategi yang penting dan semakin banyak digunakan adalah pemanfaatan dan peningkatan dukungan sistem informasi bagi enterprise. Penerapan strategi ini mengembankan misi pada sistem informasi yang pemenuhannya memerlukan keterpaduan arah dalam perencanaan, pelaksanaan dan pengendalian yang selaras dengan strategi bisnis enterprise. Pembangunan strategi untuk pemenuhan misi sistem informasi dimulai dari perencanaan yang mengidentifikasi kebutuhan informasi dan kemungkinan inovasi pemanfaatan teknologi untuk peningkatan kinerja enterprise. Perencanaan ini dapat memanfaatkan metodologi Perencanaan Arsitektur Enterprise yang menghasilkan arsitektur data, arsitektur aplikasi, arsitektur teknologi, dan arah rencana implementasinya bagi enterprise. Rencana implementasi berupa urutan pengembangan aplikasi dan migrasi / akuisisi landasan teknologi dielaborasikan menurut aspek bisnis sebagai pendorong utama, aspek organisasional untuk penentuan peran bagi sumber daya pelaku implementasi, aspek lingkungan sistem informasi dan teknologi informasi untuk menjembatani kondisi sistem-sistem saat ini dan yang akan diwujudkan, serta aspek pengembangan aplikasi yang mempertautkan satu tahap pengembangan dengan tahap pengembangan lainnya. Kata kunci: rencana strategis, sistem informasi, EAP, Zachman Framework.
PENDEKATAN METODE RULE BASED DALAM MENGALIHBAHASAKAN TEKS BAHASA INGGRIS KE TEKS BAHASA INDONESIA Utami, Ema; Hartati, Sri
Jurnal Informatika Vol 8, No 1 (2007): MAY 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (107.395 KB) | DOI: 10.9744/informatika.8.1.pp. 42-53

Abstract

Natural Language Processing is computer ability to process language, written and oral which was used by human in daily conversation. For computation process, language must be presented as simbolic line which follows certain rule. This English text translation into Indonesian text uses Rule Based method because it was done bilingually with different grammar. This English text translator to Indonesian is able to translate the sentences in daily conversation sentences that is close to its original meaning, so that it could help The English learning process to be easier. English text translator to Indonesian is able to detect group of sentences within several paragraphs for one input execution. The general pattern of Explaining-Explained which was found in English language could be translated into Explained-Explaining which follows Indonesian general grammar. The use of Rule Based method with parsing tree based and production rule in English text translator to Indonesian is able to handle the different grammar rule from both languages, so that it produces the suitable translation. Abstract in Bahasa Indonesia : Natural Language Processing (Pemrosesan Bahasa Alami) merupakan kemampuan suatu komputer untuk memproses bahasa, baik lisan maupun tulisan yang digunakan oleh manusia dalam komunikasi sehari-hari. Untuk proses komputasi, bahasa harus dipresentasikan sebagai rangkaian simbol yang memenuhi aturan tertentu. Penerjemahan teks bahasa Inggris ke bahasa Indonesia menggunakan metode Rule Based karena penerjemahan dilakukan secara bilingual (dua bahasa) yang mempunyai tata bahasa yang berbeda. Penerjemah teks bahasa Inggris ke teks bahasa Indonesia ini dapat menerjemahkan kalimat-kalimat dalam "daily conversation" dengan cukup baik dan mendekati makna aslinya sehingga dapat membantu proses pembelajaran bahasa Inggris dengan lebih mudah. Penerjemah teks bahasa Inggris ke teks bahasa Indonesia ini mampu mengenali kumpulan kalimat dalam beberapa paragraf untuk sekali eksekusi input. Pola MD (Menerangkan-Diterangkan) yang umum dijumpai dalam teks bahasa Inggris dapat diterjemahkan menjadi DM (Diterangkan-Menerangkan) sesuai kaidah umum bahasa Indonesia. Penggunaan metode Rule Based dengan parsing tree dan aturan produksi dalam penerjemah teks bahasa Inggris ke teks bahasa Indonesia dapat menangani perbedaan aturan tata bahasa dari kedua bahasa tersebut sehingga menghasilkan terjemahan yang sesuai. Kata kunci: pemrosesan bahasa alami, penerjemahan, metode rule based, bilingual, bahasa Inggris, bahasa Indonesia.
PENGEMBANGAN SANDPILE MODEL UNTUK MEMPREDIKSI SISTEM YANG DALAM KONDISI CHAOTIC Bukhori, Saiful
Jurnal Informatika Vol 8, No 1 (2007): MAY 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/informatika.8.1.pp. 63-67

Abstract

Chaotic condition or dynamic system (in physics) is a condition that a system always grows. In a system that has chaotic condition, a method to predicti the future condition is needed. This method is important to support the decision for industry or organization.Chaotic condition also has happened in the industry or organizations that will launch a new product. Launching the new product not only influence this new product but also influence the product in the market. Sand pile model is an algorithm that designed wit illustration of sand pile in the real life. In this research a sand pile model for solved the chaotic condition is developed. The result of this research shows that sand pile model algorithm can be used to solve the chaotic condition with pay attention of add inside, rounds and surface parameters. Abstract in Bahasa Indonesia : Keadaan chaotic atau dalam ilmu fisika disebut sebagai dynamic system merupakan kondisi dimana sistem selalu berkembang. Pada sistem yang memiliki kondisi chaotic ini dibutuhkan metode yang cukup rumit untuk memprediksi kondisi yang akan datang, padahal prediksi merupakan kebutuhan yang sangat penting untuk menentukan suatu keputusan yang diambil suatu perusahaan atau organisasi yang berpengaruh pada kondisi yang direncanakan. Keadaan chaotic ini juga terjadi apabila suatu perusahaan atau organisasi akan meluncurkan produk baru atau fitur tambahan dari suatu produk yang sudah ada. Peluncuran suatu produk baru atau fitur tambahan dari produk yang sudah ada tidak hanya mempengaruhi produk yang akan diluncurkan, akan tetapi juga mempengaruhi produk yang sudah ada. Sandpile model merupakan algoritma yang dibuat dengan mengilustrasikan prinsip bagaimana perilaku sandpile pada real-life. Pada penelitian ini dikembangkan sandpile model untuk memecahkan keadaan chaotic pada saat perusahaan atau organisasi akan meluncurkan produk baru atau fitur tambahan dari suatu produk yang sudah ada. Dari hasil penelitian didapatkan bahwa algoritma sandpile model merupakan salah satu algoritma yang dapat digunakan untuk memprediksi sistem yang dalam kondisi chaotic dengan memperhatikan parameter add Inside, parameter rounds dan parameter Surface. Kata kunci: Sandpile model, parameter add inside, parameter rounds, parameter surface.

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