Judul: Analisis Willingness To Pay Masyarakat terhadap Pembayaran Jasa Lingkungan Mata Air Cirahab (Desa Curug Goong, Kecamatan Padarincang, Kabupaten Serang, Banten)
Abstrak: Water is one of important elements in human life. Water is also used for a variety of interest such as drinking, cooking, washing, and all other activities that directly relate to human walfare. The purpose of research is to determine the value of willingness to pay (WTP) for community economic instruments, namely payment environmental services, the factors that affect respondents’s willingness to do a payment environmental services and the factors that affect the value of preparedness. Willingness of respondents to pay for environmental services is influenced by several factors, such as the assessment of water quality, the amount of water needs, and the distance to the water source. The assessment of water quality impacts is significant at 90 percent, variable amount of water needs is significant at 95 percent, while variable distance to the water source is significant at 99 percent. WTP value in this research is the value that will be given by the respondents to environmental services generated by Cirahab spring per liter per household. Average WTP is Rp. 101/liter/household, while total WTP is Rp. 83.835/liter. The factors affecting the value of respondents’s WTP are influenced by the assessment of water quality, the amount of water need, the distance to the water source, and the average household income. The assessment of water quality impacts is significant at 90 percent, variable anount of water needs is significant at 95 percent, variable distance to water source is significant at 99 percent, and variable average household income is significant at 90 percent. Once established average WTP value per liter per household has been determined the potential value of water Cirahab spring is calculated by multiplying the average WTP value with the number of respondents environmental services utilization. The value of environmental services by community is around 51.887.305/liter/year that can be generated by 4,94 Ha of land through transfer benefit method. Land should be planted to absorp tree so that the quality water and quantity water of Cirahab spring be sustainable. The potential valus of Cirahab spring was obtained from the multiplication number of environmental services by community with average WTP value, so the potential value of Cirahab spring is Rp. 5.240.617.805/year which is more greater than the cost restoration of forest ecology is Rp. 544.758.500/Ha/year. Key words : water, payment environmental services, willingness to pay, transfer benefit, the cost restoration of forest ecology
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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: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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