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: Weeds Dominance According to the Pruning Years of Tea Plant (Camellia sinensis (L) O. Kuntze) at Negara Kanaan Tea Plantation, PT Ratnapura Bianka, Bandung
Abstrak: Budidaya tanaman teh tidak lepas dari keberadaan gulma. Dominansi gulma berdasarkan tahun pangkas perlu diketahui agar pengendalian gulma terlaksana dengan efektif. Kegiatan magang bertujuan menganalisis dominansi gulma menurut tahun pangkas tanaman teh. Hasil pengamatan menunjukkan bahwa gulma dominan yang tumbuh pada TP 1 dan TP 2 didominasi Oplismenus hirtellus sedangkan TP 3, 4, dan 5 didominasi Ageratum conyzoides. Nilai koefisien komunitas antar tahun pangkas kurang dari 70%, sehingga vegetasi gulma bersifat heterogen. Pengelolaan kerja pengendalian gulma berprinsip POACE. Pengendalian gulma dilaksanakan dengan metode manual menggunakan sabit dan kimiawi menggunakan knapsack sprayer. Herbisida yang digunakan berbahan aktif Isopropilamina glifosat dengan dosis antara 1,61-2,50 l ha-1. Pengendalian gulma kimiawi dilaksanakan dengan rotasi 3-6 bulan. Pekerja pengendalian gulma kimiawi dapat menyelesaikan 0,4 ha HK-1 pada TP 1 dan 0,5 ha HK-1 pada TP 2 hingga TP 4. Pekerja pengendalian gulma belum mematuhi kelengkapan APD yang ditetapkan perusahaan. Biaya pengendalian gulma pada TP 1 hingga TP 4 berkisar antara Rp541.971 hingga Rp1.004.928. Keberagaman gulma setiap tahun pangkas mempengaruhi kegiatan pengelolaan kerja pengendalian gulma secara umum., The cultivation of tea plants cannot be separated from the presence of weeds. Weed dominance by year of pruning needs to be known so that weed control is carried out effectively. The internship activity aims to analyze the dominance of weeds by year of pruning of tea plants. The results showed that the dominant weeds growing in TP 1 and TP 2 were dominated by Oplismenus hirtellus, while TP 3, 4, and 5 were dominated by Ageratum conyzoides. The community coefficient value between pruning years is less than 70%, so the weed vegetation is heterogeneous. Weed control work management is based on the POACE principle. Weed control is carried out manually using a sickle and chemically using a knapsack sprayer. The herbicide used as an active ingredient is Isopropylamine glyphosate with a dose between 1.61-2.50 l ha-1. Chemical weed control is carried out with a rotation of 3-6 months. Chemical weed control workers can complete 0.4 ha HK-1 at TP 1 and 0.5 ha HK-1 at TP 2 to TP 4. Weed control workers have not complied with the completeness of PPE set by the company. Weed control costs in TP 1 to TP 4 ranged from Rp. 541,971 to Rp. 1,004,928. The diversity of weeds each year affects weed control work management activities in general.
Keyword: Ageratum conyzoides, cost efficiency, herbicide, Oplismenus hirtellus, PPE

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