Judul: The Effect of Social Support and Adolescent-Parents Communication on Subjective Well-Being of Adolescent among Indonesian Migrant Worker Families
Abstrak: Kesejahteraan subjektif adalah persepsi seseorang mengenai kebahagiaan dan kepuasan terhadap pengalaman hidupnya. Tujuan penelitian ini adalah menganalisis karakteristik remaja, karakteristik keluarga, pengaruh dukungan sosial, komunikasi remaja-orang tua terhadap kesejahteraan subjektif remaja pada keluarga pekerja migran. Metode penelitian ini menggunakan metode non-probability sampling dengan teknik convenience sampling di lima sekolah terpilih di wilayah Kecamatan Kesugihan, Kabupaten Cilacap, Provinsi Jawa Tengah. Responden penelitian ini melibatkan 99 remaja SMP sederajat terdiri atas 54 persen perempuan dan 46 persen laki-laki dengan usia berkisar 12-16 tahun. Hasil penelitian menunjukkan bahwa dukungan sosial tertinggi yang didapatkan remaja diperoleh dari dukungan sosial orang tua. Komunikasi remaja dengan ibu lebih baik dibandingkan komunikasi ayah dengan remaja. Hasil uji korelasi menyatakan dukungan sosial dan komunikasi remaja-orang tua mempunyai hubungan positif signifikan dengan kesejahteraan subjektif remaja. Hasil penelitian menemukan jenis kelamin berpengaruh negatif signifikan terhadap kesejahteraan subjektif remaja. Dukungan sosial komposit berpengaruh positif terhadap kesejahteraan subjektif remaja. Komunikasi ibu berpengaruh positif signifikan terhadap kesejahteraan subjektif remaja., Subjective well-being is the perception of happiness and satisfaction with life experiences from someone's point of view. The purpose of this research is analyze the effect of adolescent characteristics, family characteristics, social support, and adolescent-parental communication on the subjective well-being of adolescents in migrant worker families. The Method used in this research is non-probability sampling method with a convenience sampling technique in five selected schools in the Kesugihan District, Cilacap Regency, Central Java. The respondents of this study involved 99 junior high school students with ages ranging from 12-16 years. The highest social support is received from parents. The result of the study also found that mother communication with adolescent is better than father communication with adolescent. The result shows that social support and child-parent communication has a significant positive correlation with adolescents subjective well-being. The results of the study suggest that gender had a significant negative effect on the subjective well-being of adolescents. Composite social support has a positive effect on the subjective well-being of adolescents. Mother's communication has a significant positive effect on the subjective well-being of adolescents.
Keyword: dukungan sosial, keluarga pekerja migran, kesejahteraan subjektif, komunikasi remaja-orang tua

Judul: The Influence of Parenting Styles and Social Support on Adolescent’s Self-Adjustment of Indonesian Migrant Worker Families
Abstrak: Penyesuaian diri adalah suatu kemampuan untuk membuat hubungan yang memuaskan antara individu dengan lingkungan sekitarnya. Tujuan penelitian ini adalah menganalisis pengaruh karakteristik remaja, karakteristik keluarga, gaya pengasuhan, dan dukungan sosial terhadap penyesuaian diri remaja pada keluarga Pekerja Migran Indonesia (PMI). Metode penelitian ini menggunakan metode non-probability sampling dengan teknik convenience sampling pada 10 SMP/sederajat di Kecamatan Kesugihan, Kabupaten Cilacap, Jawa Tengah. Penelitian ini melibatkan 160 remaja yang merupakan siswa SMP/sederajat dengan rentang usia 12-16 tahun, didominasi oleh remaja perempuan, dan tinggal bersama kakek/nenek. PMI didominasi oleh ibu sebesar 89,4 persen, dominan berstatus menikah, dan termasuk dalam keluarga kecil. Indeks rata-rata gaya pengasuhan ibu lebih baik dibandingkan gaya pengasuhan ayah. Dukungan sosial tertinggi diperoleh dari orang tua. Penyesuaian diri remaja berada pada kategori sedang. Hasil penelitian menunjukkan gaya pengasuhan dan dukungan sosial mempunyai hubungan positif sekaligus berpengaruh signifikan terhadap penyesuaian diri remaja pada keluarga PMI., Adjustment is an ability to make a satisfying relationship between the individual and the surrounding environment. The purpose of this study was to analyze the effect of adolescent’s characteristics, family’s characteristics, parenting styles, and social support on adolescent adjustment among Indonesian Migrant Workers (PMI) families. This research method used non-probability sampling method with convenience sampling technique at 10 junior high schools in Kesugihan Sub-district, Cilacap District, Central Java Province. This study involved 160 junior high school students with an age range of 12-16 years, dominated by girls, and lived with their grandparents. The PMI is dominated by mothers at 89.4 percent, the dominant status is married, and belongs to a small family. The average index of mother's parenting style is better than father's parenting style. The highest social support was obtained from parents. Adolescent’s self-adjustment is in the medium category. The results showed that parenting style and social support have a positive relationship as well as a significant influence on adolescent’s self-adjustment among Indonesian Migrant Workers (PMI) families.
Keyword: adjustment, adolescent, migrant workers, parenting styles, social support

Judul: The Construction of Greedy SVP LLL Algorithm
Abstrak: A lattice is a set of all integer linear combination of a set of linearly independent vectors in ℝ𝑛���. The independent vectors are called bases of lattice. Any lattice can be generated from many bases, and these bases have the same cardinality. In the lattice, the most fundamental and renowned problem is the Shortest Vector Problem (SVP). SVP is a tracking problem of the shortest nonzero vector in a lattice with equivalent bases. In two dimensions, SVP problem has resolved exactly by Gauss’ algorithm. When the lattice dimension is higher than two, A.K. Lenstra, H.W. Lenstra and L. Lovasz gave a LLL algorithm to compute approximation of nonzero shortest vector in the lattice. Reduced bases solution obtained from LLL algorithm still be an approximation and has polynomial running time of arbitrary dimension which large enough. In 1994, Schnoor and Euchner modified this LLL algorithm as a new variant which later was named deep insertion LLL algorithm. This algorithm is a modified version of the LLL algorithm to the terms of the exchange step to improve the accuracy of output of LLL reduced bases and applying it to the subset sum problem. The purpose of this research are: (1) Reconstruct the LLL algorithm and deep insertion LLL algorithm using a geometric approach. (2) Construct a greedy SVP LLL algorithm. (3) Implement the three algorithms in a symbolic programming language, and evaluate them experimentally. A bases ℬ=[𝐛���1,𝐛���2,…,𝐛���𝑛���] in ℝ𝑚��� is called reduced LLL with parameter 𝛿��� if satisfies: (a) |𝜇���𝑗���𝑖���|≤12, for every integer 𝑖���,𝑗��� with 1≤𝑖���<𝑗���<𝑛���. (b)𝛿���‖𝜋���𝑗���(𝐛���𝑗���)‖2≤‖𝜋���𝑗���(𝐛���𝑗���+1)‖2, for 𝑗���=1,2,…,𝑛���−1,where 𝛿��� is a reduced parameter of real numbers with 14<𝛿���<1. The first requirement is the reduced basis 𝛿��� must “nearly orthogonal” and in its computation case, this requirement can be reached out by using the Gram-Schmidt’s orthogonalization. While the second requirement is called exchange step, or used to called as Lovasz condition. By using both of these requirements, then they establish the LLL algorithm. Then, Schnoor and Euchner modify the LLL algorithm based on the requirements of the exchange step called the deep insertion LLL algorithm, where the exchange step is based on the comparison of the projected vector in orthogonal complement [𝐛���1,𝐛���2,…,𝐛���𝑘���−1]⊥ after j-th reduction. To construct greedy SVP LLL algorithm, the requirements of the exchange step is based on purely by comparing norm of lattice 𝐛���𝑗��� with norm lattice 𝐛���𝑖��� for 𝑖���=1,2,3…,𝑗���−1. The process of insertion reduced vector after the exchange step also has done greedily. Then, we calculate the number of arithmetic operation in greedy SVP LLL algorithm for further analysis. The result of our exprimentation for three algorithms on the certain matrix size shows that the running time of the three algorithms increases propotional to the size of the matrix. The result also shows that by using 𝛿���=34 for the LLL algorithm and the deep insertion LLL algorithm, and the greedy SVP LLL algorithm which is a new variant made by using no parameter of 𝛿���, outperform of the other of two previous algorithm in terms of speed with the same output.
Keyword: LLL algorithm, LLL deep insertion algorithm, greedy SVP LLL algorithm