Judul: The Influence of Parent-Adolescent and Peer Interaction on Premarital Sexual Perception of Adolescent Broken Home
Abstrak: Perceraian di Indonesia terus meningkat mengakibatkan ketidakseimbangan peran dan fungsi keluarga. Ketidakseimbangan tersebut memberikan dampak kepada remaja seperti perilaku seksual pranikah remaja. Tujuan dari penelitian ini adalah untuk mengidentifikasi hubungan dan pengaruh interaksi orang tua-remaja dan interaksi teman sebaya terhadap persepsi seksual pranikah pada remaja dari keluarga broken home. Metode yang digunakan dalam penelitian ini adalah metode purposive sampling dengan pengisian survei secara online. Jumlah sampel penelitian sebanyak 190 remaja yang berasal dari keluarga broken home di daerah Jabodetabek (Jakarta, Bogor, Depok, Tangerang dan Bekasi). Uji hubungan menunjukkan interaksi orang tua-remaja memiliki hubungan yang negatif signifikan terhadap persepsi seksual pranikah remaja dari keluarga broken home. Hasil uji pengaruh menunjukkan interaksi orang tua-remaja berpengaruh negatif signifikan terhadap persepsi seksual pranikah remaja dari keluarga broken home, namun interaksi teman sebaya memiliki pengaruh positif tidak signifikan terhadap persepsi sekual remaja dari keluarga broken home., Divorce in Indonesia continues to increase resulting in an imbalance of family roles and functions. This imbalance has an impact on adolescents such as adolescent premarital sexual behavior. This study aims to identify the correlation and effect of parent-adolescent interaction and peer interaction on premarital sexual perception among adolescents from broken home family. The method used in this study is a purposive sampling method using an online survey. The total research samples were 190 teenagers from broken home families living in the Jabodetabek area (Jakarta, Bogor, Depok, Tangerang and Bekasi). The relationship test showed that the parent-adolescent interaction had a significant negative relationship on the premarital sexual perception of adolescents from broken home families. The results of the influence test showed that the parent adolescent interaction had a significant negative effect on premarital sexual perceptions of adolescents from broken homes, but peer interaction had an insignificant positive effect on sexual perceptions of adolescents from broken homes.
Keyword: broken home, interaksi orang tua-anak, interaksi teman sebaya, persepsi seksual pranikah, remaja

Judul: Pengaruh Kelekatan Remaja-Orang Tua, Tekanan Teman Sebaya, dan Konsep Diri terhadap Perilaku Seksual Pranikah Remaja SMK
Abstrak: Perkembangan seksualitas pada remaja menimbulkan tujuan baru yaitu reproduksi (keturunan) yang seringkali membuat remaja mengabaikan risiko. Penelitian ini bertujuan untuk menganalisis faktor-faktor yang memengaruhi perilaku seksual pranikah remaja. Penelitian ini menggunakan desain cross-sectional study yang dilakukan secara purposive pada dua SMK Swasta masing-masing di Kota dan Kabupaten Bogor. Sampel penelitian adalah siswa kelas 10 dan 11 yang pernah atau sedang berpacaran serta memiliki orang tua kandung lengkap sehingga total responden 212 siswa. Hasil penelitian menunjukkan bahwa tidak ditemukan perbedaan signifikan pada kelekatan remaja-orang tua, tekanan teman sebaya, konsep diri, dan perilaku seksual pranikah antara di kota dan kabupaten. Penelitian menunjukkan usia ibu berhubungan positif dengan kelekatan remaja, remaja laki-laki cenderung memiliki kelekatan remaja-orang tua dan tekanan teman sebaya lebih tinggi. Kelekatan remaja-orang tua berpengaruh secara langsung terhadap konsep diri remaja, akan tetapi kelekatan remaja-orang tua tidak berpengaruh terhadap perilaku seksual pranikah. Perilaku seksual pranikah remaja hanya dipengaruhi langsung oleh tekanan teman sebaya., The development of sexuality in adolescents raises a new goal: reproduction (offspring). This often causes adolescents to ignore risks. This study aims to analyze the factors that influence adolescent premarital sexual behavior. It uses a cross-sectional study design conducted purposefully at two private vocational schools in Bogor City and Regency, respectively. The research sample consists of 10th and 11th-grade students who are currently dating, or have been, and have complete biological parents. Therefore, the total number of respondents is 212 students. The results show no significant differences in adolescent-parent attachment, peer pressure, self-concept, and premarital sexual behavior between the city and regency. The study also reveals that maternal age is positively associated with adolescent attachment. It also shows that male adolescents tend to have higher adolescent-parent attachment and peer pressure. Parent-adolescent attachment has a direct effect on adolescent self-concept. However, adolescent-parent attachment has no effect on premarital sexual behavior. Adolescent premarital sexual behavior is only directly influenced by peer pressure.
Keyword: parental attachment, peer pressure, pre-marital sexual behavior, self-concept, vocational students

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