Judul: Tingkat Kontribusi Pemeliharaan Sumber-sumber Air Minum Masyarakat Perkotaan terhadap di DAS Baubau
Abstrak: Bau-Bau is one small town to being a center of actively carry out the devel9:f!:...ment in various sectors of life. Increasing population and incomes have resul'f!dP in an increase in the demand for clean water. Water supply undertaken by thd{egional Water Company (PDAM) has not been sufficient for society so that t~ need for maintenance of drinking water sources available, it should be done -& addition to search sources of new water to the public water supply fUljilleil. Hence the need for public participation in contributing to that it. The aim ci this study were first, calculate the water needs of households and indusmes in the watershed Baubau, second, identifY potential water sources that have ljen used and which have not been utilized and third, to analyze people's willing!1ess to contribute to the maintenance of drinking water sources and the factor~that influence it. r+ fhe research was conducted in the watershed Baubau, which includes SUbdi!ifrict Wolio, Subdistrict Sorawolio, Subdistrict Betoambari, Subdistrict Murhzin and Subdistrict Kokalukuna since January-March 2012. Types and sourci of data used consisted of primary data ands econdary data. Primary data is da~ obtained directly from the field through observation, surveys, and intervliDws with the public, while the secondary data obtained from the literature or re~rch reports, as well as data related agencies. ~1alysis of domestic and industrial water demand is calculated based on projections, identification of spring-spring which has been utilized and untapped uses descriptive qualitative method. Analysis of people's willingness to contri bute to the maintenance of drinking water sources done by wilingness to pay (WTP), binary logistic regression. Analysis of factors that influence the willingness to contribute using multiple linear regression analysis. The results showed that the water needs of households have incomes low, medium and high, respectively for 8.83 m3/month/ household or 55.43 literslcapita/day, 12. 70 m3/month/ household or 87.11 literslcapita/day and 20.44 m3/monthlhousehold or 126.17 literslcapitalday. The amount of water supplied from ~ entire watershed springs Baubau and utilized by PDAM of 5.99 million m3/yliir. Domestic water demand projections or household can be met by DAS Bau6§ until 2025 amounted to 5.93 million m3/year. Small industrial water demaiJfil of 7.5 m3/day, while the industry is at 21.43 m3/day. Industrial water dema~prOjections up to the year 2030 amounted to 39.5 million m3/year. cttfprings that have been utilized by the taps are Lakatepi springs, Kasombu, Sam~ona with a total intake capacity of 190 liters/sec. Springs are utilized by peop@around the Katopa Topa and Waterfall Samparona. While that has not been ~loited both public taps and water discharge is small because the springs Sulaca:ampung Lama, Waborobo, Sambuana Ladu and cave Lakasa. ruogit regression analysis results indicate that the variables are likely to co'l'lTribute significantly is education, income level and employment. Average C :::J < .C.D, en r""'+- '< 2: 0.. o 0" 3 0- (I) .:.:.J. . c: ;IJ'" o "0 o "0 c: ::J ..... o ::J "0 o "0 (I) ::J £. is· ::J ;IJ'" ~ ;s 0 r+ Q c: r+ .2: 0 c: 0 ::J i: 0 r+ c: 3 0 is .0." individual
Keyword: drinking water, contribution, willingness to pay

Judul: Willingness to Pay Analysis and Strategy for Fulfilling Community Needs for Clean Water in Setrorejo Village, Baturetno District, Wonogiri Regency
Abstrak: Desa Setrorejo merupakan salah satu desa di Kecamatan Baturetno yang masyarakatnya masih mengandalkan air tanah sebagai sumber air dalam kehidupan sehari-harinya. Desa Setrorejo yang wilayahnya merupakan kawasan karst dan perbukitan menyebabkan terdapat beberapa permasalahan dalam sumberdaya air. Permasalahan sumberdaya air yang terjadi yaitu kualitas air yang kurang baik dan penurunan kuantitas air saat musim kemarau. Tujuan dari penelitian ini adalah mengestimasi besarnya nilai Willingness to pay (WTP) masyarakat terhadap air bersih dan mengidentifikasi faktor-faktornya serta menganalisi strategi pemenuhan kebutuhan air bersih untuk masyarakat. Metode pada penelitian ini adalah analisis willingness to pay menggunakan CVM, analisis regrsi logistik, dan Analitycal Hierarchy Process (AHP). Hasil penelitian menunjukkan nilai WTP yang didapatkan sebesar Rp 4.478. Faktor-faktor yang berpengaruh signifikan terhadap keputusan membayar ialah nilai penawaran, pendapatan, dan kualitas air tanah. Alternatif strategi yang dapat dilakukan dalam pemenuhan kebutuhan air bersih yaitu pengembangan infrastruktur air yang dapat dilakukan melalui pengembangan ditribusi jaringan PDAM. Nilai WTP yang didapatkan lebih besar dari nilai penawaran terendah yang berupa tarif PDAM dengan pemakaian air sampai 10m3 menggambarkan masyarakat bersedia melakukan perbaikan kualitas lingkungan dengan pendekatan pemasangan jaringan PDAM., Setrorejo village is one of the villages in Baturetno District where the people relies on groundwater as a source of water in their daily lives. Setrorejo village whose territory is a karst and hilly area causes several problems in water resources. Water resource problems that occur are deficient water quality and decrease water quantity during the dry season. The aims are to estimate the value of Willingness to Pay towards a clean water and indentify the factors and analyze the strategy for fulfillment the needs of clean water for the people. Methods that used in this research are willingness to pay using CVM, logistic regression analysis, and Analytical Hierarchy Process (AHP). The results in this research show that the obtained WTP value was IDR 4.475. The factors that have an significant influence are bid value, income, and groundwater quality. An alternatif strategy that can be done to fulfillment the need for clean water is the development of water infrastructure which can be done by developing the distribution of PDAM. The obtained WTP value is bigger that the lower bid value in the form of a PDAM tariff with water usage up to 10m3 illustrates that the people is willing to improve environmental quality by PDAM installation approach.
Keyword: CVM, AHP, PDAM, Logistic regression

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf