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Abstrak :
Surakarta is the second biggest city in Central Java. The expansion of the city is directed to the north and south. The expansion to the north side is encouraged by the existing Mojosongo PERUMNAS. The Mojosongo PERUMNAS has been developed to the northeast area approaching the Putri Cempo final waste disposal site. The final waste disposal site is located in the area that consists of volcanic stones, big conglomerates, lava precipitation, tufa, calcareous, and sand stone. The shallow well water in the Nojosongo PERUMNAS tends to be infiltrated by either the leachate or run off from Putri Cempo final waste disposal site, so that the water quality will, of course, be decreasing and potentially will in turn affect the health of community. Clean water is an essential necessity for human being. Only 40% of the urban and semi urban population and 25% of the rural population in Indonesia have access to a reliable supply of clean water. In Surakarta, only a. small part of the population has been supplied with potable water. The purpose of this research is to identify the influence of Putri Cempo final waste disposal site towards the water quality of nearby wells. The quality of well water is compared with water quality criteria from the Health Ministry through its Regulation Number 418/MENKES/PER/IBC/1890. The Location of observed shallow wells was purposely chosen. The sample of well water was collected on two occasions (in the months of July and September). The samples were collected from twelve shallow wells: eight community shallow-wells which are used for daily activities; one unused well; and three other shallow wells purposely made for this re-search. Sampling process was conducted by using standard equipment from Balai Telrnik Kesehatan Lingkungan Yogyakarta (BTKL Yogyakarta). Samples were analyzed in BTKL Yogyakarta, the examined characteristics were: total suspended solids, iron, manganese, chloride, hardness, sodium, sulphate, BOD, COD, Pb, Cd, Cu and Cr. T Test has been employed to analyze sample collected in the month of July and September. The degree of existing parameters and the distance of the wells have been analytically described. The results indicate that two parameters in lea-chafe (iron and manganese) have exceeded the threshold value of Waste Water Standard as stated in KEP-03/MEIflcLH/I I/ 1991. The wells number 1,2 and 3 which have the distance of 10 in.50 m and 100 m from the final waste disposal respectively have been affected by the lea-chafe; iron and manganese have already exceeded the thres hold value as stated in the regulation number 4l6/MENKES/PER/I/1990 concerning clean water. The content of pollutants has been highest in well number 1 that have the distance of 10 m. T test analysis indicated that season does not affect the quality of well water around the final waste disposal site. Bacteria Escherichia coil was found in high degree in every examined wells. This certify that those 12 examined well water does not fulfill a requirement for potable water. This has got to be seriously paid attention.

Abstrak :
Mobile learning (m-learning) memungkinkan pengaksesan materi elektronic learning (e-learning) melalui perangkat mobile. Hal yang penting untuk dipertimbangkan adalah adanya kemampuan adaptasi presentasi aplikasi Web yang sesuai dengan kebutuhan perangkat yang digunakan oleh client. Tesis ini membahas tentang perancangan dan implementasi m-learning yang adaptive terhadap perangkat client, serta analisa terhadap unjuk kerja aplikasi. Salah satu teknik adaptasi yang dapat dilakukan di server adalah teknik transformasi, yaitu adaptasi yang melibatkan konversi dari suatu markup language ke markup language lainnya. Teknologi eXtensible Markup Language (XML) yang menerapkan pemisahan antara data dengan presentasinya memberikan kemudahan untuk melakukan teknik adaptasi dengan transformasi ini. Keuntungan teknologi XML adalah pengelolaan situs Web yang lebih efisien, karena hanya diperlukan satu format data untuk sebuah konten. Tampilan yang sesuai dengan kapabilitas perangkat dihasilkan oleh stylesheet yang spesifik untuk setiap perangkat (single pipeline). Pembangunan aplikasi ini menggunakan perangkat lunak open source.

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Mobile learning (m-learning) allowed electronic learning materials accessing trough mobile device. The important thing to consider is the Web applications presentation adaptation capability to meet the client's device requirement. This thesis research about the design and implementation of m-learning adaptaivity towards client's device as well as application performance analysis. transformation. In this design open source software is choosed. One of adaptation techniques runs in server side is transformation technique, the one that involves conversion from one markup language to other markup language. eXtensible Markup Language (XML) technology that implemented data and presentation separation gives easy way to use this adaptation techique through transformation. The advantage of the XML technology is eficiency in Web sites management, because it only single data format neede for each content. The presentation that meet the device capability is produced by specific stylesheet for each device (single pipeline). The development of this application using open source software.

Abstrak :
Arsitektur jaringan overlay P2P berjenjang terstruktur (structured hierarchical P2P) sangat sesuai untuk jaringan heterogen karena mempertimbangkan keberagaman kapabilitas peer. Pada penelitian ini diusulkan pendekatan baru mekanisme rejoin yang dinamakan collective rejoin, dimana proses rejoin dilakukan secara per kelompok, sebagai alternatif dari pendekatan individual rejoin yang selama ini diterapkan pada arsitektur P2P berjenjang terstruktur berbasis Chord. Setiap kelompok yang mengalami kegagalan superpeer akan menunjuk normal peer dengan kapabilitas tertinggi dalam kelompoknya sebagai superpeer baru. Superpeer baru ini yang akan mengirimkan pesan rejoin ke sistem. Dengan pendekatan ini, jumlah trafik rejoin akan jauh berkurang dibandingkan pendekatan individual rejoin, sehingga konsumsi bandwidth untuk overhead trafik pengelolaan dapat dikurangi. Kinerja pendekatan collective rejoin ini dievaluasi dengan menggunakan parameter: variasi nilai rasio superpeer, tingkat dinamika jaringan (churn), ukuran jaringan, dan tingkat kesibukan jaringan (lookup query rate). Evaluasi kinerja dilakukan dengan mengamati jumlah trafik yang dihasilkan oleh proses rejoin pada saat terjadi kegagalan superpeer (rejoin traffic load), rasio antara lookup query yang berhasil diselesaikan terhadap seluruh lookup query yang terjadi (successful lookup rate), dan banyaknya hop yang harus ditempuh untuk menyelesaikan sebuah lookup query (lookup query cost). Nilai efisiensi diperoleh berdasarkan penghitungan penghematan penggunaan bandwitdh yang dapat dilakukan oleh pendekatan collective rejoin. Pada seluruh parameter yang diujikan, pendekatan collective rejoin menghasilkan jumlah trafik rejoin yang lebih sedikit dibandingkan dengan pendekatan individual rejoin. Hal ini dibarengi juga dengan successful lookup rate yang rata-rata lebih baik, dengan tanpa meningkatkan lookup query cost. Rasio superpeer dan ukuran jaringan berpengaruh signifikan terhadap nilai efisiensi. Sedangkan pada pengujian terhadap parameter tingkat dinamika jaringan dan tingkat kesibukan jaringan, nilai efisiensi relatif tetap. Hasil simulasi menunjukkan bahwa pendekatan collective rejoin efektif jika diterapkan pada jaringan P2P berjenjang terstruktur dengan ukuran kelompok yang besar (pada penelitian ini, dengan rasio superpeer terbesar adalah 10%). ...... By considering the diversity of p overlay network architecture is weeer capability, structured hierarchical P2Pll suited for heterogeneous networks. In this research, a new approach of rejoin mechanism is proposed, called collective rejoin, whereby rejoin process is done per group. Each group that experiences a superpeer failure will appoint a normal peer that has highest capabilities in the group as the group's new superpeer. This new superpeer will send rejoin message to the system. Using this approach, the number of rejoin traffic is less than individual rejoin. In turn, it will decrease the bandwidth consumption of management traffic overhead The collective rejoin approach performance is evaluated using parameters: variety of superpeer ratio, network dynamics level (churn), network size, and overlay network activities level (lookup query rate). Performance evaluation is conducted by observing the number of rejoin traffic, the successful lookup rate, and the lookup query cost. The efficiency value is obtained by calculating bandwidth consumption saving by the collective rejoin approach. On all tested parameters, the collective rejoin approach produces fewer rejoin traffics than the individual rejoin approach. The successful lookup rate of collective rejoin is outperform the individual rejoin. The lookup query cost of the collective rejoin can be maintained at the same value as in the individual rejoin. Superpeer ratio and network size significantly impact the efficiency. Meanwhile, networks dynamic and activities provide a relative stable efficiency. The results show that the collective rejoin approach is useful for large group size hierarchical structured P2P (in this research the maximum superpeer ratio is 10%).