Judul: Pruning Management of Tea (Camellia sinensis (L.) O. Kuntze) at Negara Kanaan Estate, PT Ratnapura Bianka, Bandung, West Java
Abstrak: Produktivitas dan mutu teh dapat ditingkatkan melalui pengelolaan pemangkasan yang baik. Kegiatan magang telah dilaksanakan di Kebun Negara Kanaan, PT Ratnapura Bianka, Bandung, Jawa Barat pada bulan Januari sampai April 2021. Kegiatan magang bertujuan memperoleh pengalaman kerja dan pengetahuan mengenai budi daya tanaman teh, khususnya pengelolaan pemangkasan tanaman teh dan faktor-faktor yang mempengaruhinya. Kegiatan magang dilakukan dengan mengamati dan mengerjakan kegiatan teknis dan manajerial kebun, serta melakukan pengamatan aspek khusus pengelolaan pemangkasan tanaman teh. Hasil pengamatan menunjukkan bahwa produktivitas tanaman teh meningkat dari tahun pangkas I hingga tahun pangkas IV, dan menurun pada tahun pangkas V. Rata-rata tinggi bidang petik tanaman teh sebelum dipangkas adalah 118,90 cm dengan rata-rata lebar bidang petik sebesar 105,99 cm. Rata-rata persentase pucuk burung tanaman teh sebelum dipangkas sebesar 89,22%. Rata-rata realisasi tinggi pangkasan yaitu 63,08 cm dan tidak berbeda nyata dengan standar tinggi pangkasan kebun, 65 cm. Pertumbuhan tunas baru setelah pemangkasan pada cabang dengan diameter 1,0-1,9 cm sesuai untuk produksi karena memiliki jumlah tunas yang ideal sehingga pertumbuhan tinggi tunas dapat optimal dan waktu pemetikan jendangan tidak terlalu lama yaitu 13 MSP.
Keyword: dormant bud, productivity, pruning rotation, shoot growth, tea pruning

Judul: Pengelolaan Pemangkasan Tanaman Teh (Camellia sinensis (L.) O. Kuntze) di Kebun Wonosari, PTPN XII, Malang, Jawa Timur
Abstrak: Pemangkasan merupakan kegiatan pemeliharaan tanaman teh yang sangat penting untuk meningkatkan jumlah dan kualitas hasil pada tanaman teh. Kegiatan magang secara umum bertujuan meningkatkan pengetahuan, memperoleh pengalaman kerja, dan meningkatkan keterampilan mengenai aspek teknis dan manajemen perkebunan teh, secara khusus bertujuan mempelajari pengelolaan pemangkasan melalui analisis aspek-aspek pemangkasan yang meliputi pemenuhan kriteria pemangkasan, pelaksanaan pemangkasan, dan pasca pemangkasan. Kegiatan magang dilaksanakan pada Januari hingga April 2021 di Kebun Wonosari, PTPN XII, Malang. Magang dilakukan secara langsung dengan mengikuti aspek teknis dan manajerial teh di lapangan dan tidak langsung dengan mengambil data sekunder dari arsip perusahaan. Kegiatan magang dilakukan untuk mempelajari pengelolaan pemangkasan dengan melihat pengaruh ketinggian tempat dan penggunaan alat pangkas yang berbeda. Pengamatan yang dilakukan untuk mengetahui hal tersebut yaitu dengan mengamati pemangkasan di Afdeling Wonosari (950-1200 m dpl) dan Afdeling Gebug Lor (1200-1450 m dpl) masing-masing 3 nomor kebun dan setiap nomor kebun diambil 15 tanaman contoh. Pengamatan juga dilakukan pada penggunaan alat pangkas manual dan mekanis di Afdeling Wonosari masing-masing 3 nomor kebun dan setiap nomor kebun diambil 15 tanaman contoh. Kegiatan magang telah meningkatkan keterampilan sebagai tenaga pemangkas dengan prestasi kerja sebesar 0,004 ha HK-1. Hasil pengamatan menunjukkan pelaksanaan pemangkasan berdasarkan tinggi dan diameter tanaman masing-masing 137,9 cm dan diameter 142,3 cm sudah memenuhi kriteria pangkas, persentase pucuk burung 64,25% kurang dari kriteria pangkas 70%, dan pati akar belum memenuhi kriteria pangkas. Penggunaan alat pangkas mekanis banyak meninggalkan cabang berdiameter kurang dari 1 cm, alat manual banyak meninggalkan cabang berdiameter 1-1,99 cm. Pertumbuhan tunas lebih cepat di Afdeling Wonosari yang berarti semakin rendah tempat, pertumbuhan tunasnya semakin cepat. Keterampilan pemangkas dipengaruhi oleh umur dan lama kerja, tidak dipengaruhi tingkat pendidikan. Pelaksanaan dan realisasi pemangkasan tidak selalu sesuai dengan rencana. Pengelolaan sisa pangkasan dilakukan dengan meletakkan serasah pangkasan di atas perdu yang telah dipangkas dan diturunkan setelah kering., Pruning is important tea plant maintenance activity to increase quantity and quality of yields on tea plants. This internship generally aimed to increase knowledge, gain work experience, improve skills regarding technical and manajerial of tea plantations and spesifically aimed to study the management of pruning through analysis of pruning aspects which include pruning criteria, pruning implementation, and post-pruning. Internship activities were held in January to April 2021 at Wonosari Plantation, PTPN XII, Malang. The internship was carried out directly by participating in the technical and managerial aspects of tea in the field and indirectly by taking secondary data from the company archives. The internship aimed to learn about pruning management, especially the effect of altitude and the use of different pruning tools. Therefore, observations were made by observing pruning in Afdeling Wonosari (950-1200 m asl) and Afdeling Gebug Lor (1200-1450 m asl) each with 3 garden numbers and 15 sample plants each. Observations were also made on the use of manual and mechanical pruning tools in Afdeling Wonosari, each with 3 garden numbers and 15 plant samples for each garden number. The internship activity has increased skills as a pruner with a work performance of 0,004 ha HK-1. The results showed that the height was 137,9 cm and diameter was 142,3
Keyword: pruning tools, branch damage, branch composition, root starch, planting year

Judul: Algorithm Construction of HLI Hash Function
Abstrak: Cryptography is a study of mathematical techniques related to aspects of information security regarding on confidentiality, data integrity, entity authentication, and data origin authentication. Data integrity is a service, which is associated with the conversion of data carried out by unauthorized parties. To maintain data integrity, one can use hash functions. An hash function is a computationally efficient function to map an arbitrary length bitstring to a fixed length bitstring called as hash value. The use of hash function in maintaining the information integrity and authentication is in digital signatures, virus protection, and software distribution. Illustration of the hash function in the integrity and authentication of information that is emailed as follow. The sender sends the information and hash value to the recipient. If the hash value of the information is equal to the hash value that is sent by the sender, then information has not been changed. Otherwise the information has been changed. An hash function has two properties, one way and collision resistance. An hash function is called one way if it is computationally infeasible to find any input such that when given any hash value . Meanwhile an hash function is called collision resistant if it is computationally infeasible to find any two inputs where such that . The purpose of this study is to construct a HLI hash function algorithm, to analyze the speed and security of the hash functions as a results of construction. Furthermore, it is to compare it with SWIFFT. Hash function is constructed based on the result of algebraic operations on modular polynomial ringwith . Modular polynomial ring noted as is a set of all polynomials of degree at most with coefficients in . can be represented as a set of integer vector of modulo in dimension . So, it is simple to implement in a computer. In vector operations, is lattice . Furthermore, alattice that is defined from certain polynomial ring is called ideal lattice. HLI hash function is consists of addition and multiplication algorithm in the ring. Addition algorithm consists of sumation operations of modulo and multiplication consists of multiplication operations of modulo . Generally, algorithm of HLI hash function consists of multiplication operations of modulo and addition operations of modulo . However, if the input is binary number then multiplication algorithm only consists of multiplication operation of modulo , so algorithm of HLI hash function consists of multiplication operations of modulo and addtion operations of modulo . An hash function is secured if it has two properties, i.e., one way and collision resistance. HLI hash function hash is one way, it is following the proof of Micciancio. It is has collision resistant because of polynomial is irreducible over and monic. Moreover, it is proved that for every unit vector , the vector is small vector. If the input of hash function is a binary number then HLI hash function only involves addition operations of modulo . So the time that used almost same with SWIFFT. The excellence of HLI hash function is the key size smaller than SWIFFT. This effect on
Keyword: hash function, modular polynomial ring, lattice