Pengaruh Sambaran Petir Langsung pada Variasi Ketinggian Menara Vertikal terhadap Tegangan Induksi yang Dirasakan oleh Jaringan Distribusi Disekitarnya

If the top of telecommunication towers or radio or television have been struck by a lightning, distribution lines in the vicinity of those would immediately underwent an induced overvoltage impuls. Magnitude of the induced voltage impuls depend on how tall the tower above ground. Such lightning stroke is type of an indirect lightning stroke which is always appear in the problem of the induced overvoltage phenomenon on overhead distribution lines. Examinant of the effects of various height of the tower and the distance parameter between the tower and the route of distribution line on rate of rise of the induced voltage of the lightning is undertaken in this paper, and the computer is as its simulator. The method of the simulation of a lightning stroke in the vicinity of distribution line and its formulation is adopted from a simulation model that has been_ proposed by Ishii et al. (1994) and Eriksson et al (1982) respectively.  The result of the simulation show that presence of a vertical tower structure in the vicinity of the distribution line route will result in a lower induced voltage (on the order of 13.4 %), and effect of tower height parameter is very significant for the assumed conditions. It is proposed that this significant parameter be studied extensively in order to predict the induced voltage accurately

Penentuan Strategi Saluran Distribusi Berdasarkan Karakteristik Produk Sukses

This research was done to determine the distribution channel strategy based on characteristics of successful products. Totaling 100 products from 15 types of product categories were used as a research object. Independent variables consisted of product characteristic variables and distribution channel variable. Product characteristic variables consisted of price, safety, feature, product performance, service, convenience, brand, and design. Coverage was used as adistribution channel variable and market share as a dependent variable. Ordinary Kano and Modified Kano were used to construct some mathematical models. Each model then was evaluated with coefficient determination test. The mathematical model constructed in this study has R2 value 16,26%. Coverage included in one-dimensional requirement which means adding value to coverage variable will linearly increase market share.  Keyword: channel distribution strategy, product characteristics, Kano model, mathematical model

Konsep Hulu-Teben pada Permukiman Tradisional Bali Pegunungan/Bali Aga di Desa Adat Bayung Gede Kecamatan Kintamani Kabupaten Bangli, Bali

The research tries to explain the specific Hulu-Teben concept of Bayung Gede custom village as dialog result between the normative Hulu-Concept as a background knowledge with the phenomena of spatials system anomaly at Bayung Gede customvillage.The research utilized phenomenology paradigm of Hussrel where Hulu-Teben of custom village in general takes a role as background knowledge. It’s discussed with the macro spatial system of Bayung Gede custom village to show the uniqueness spatial as the architectural anomaly of mountain village. Deepening study of the anomaly above was done in gaining the community’s social-culture background/their local wisdom as thetranscendental consciousness. Further Hussrel emphasizes that the highest transcendental peak is obtained by doing the three steps of reduction, i.e : (i) a phenomenological reduction of all related information to get some empirical themes, such as ; (a) Upperengga Mala and (b) Tegak Paumahan, (ii) the eidetic reduction of the three empirical themes to generate the architecture concept and (iii) the final reduction is transcendental reduction to discovery the architecture local theory. In the context within the research of Bayung Gede custom village, the aim is only focused at the architecture concept.The research results show that Hulu-Teben concept of Bayung Gede custom village has adapted Hulu-Teben in general shown by existence of Para Kahyangan Desa (custom village religious indicator) as the appreciating expression form for community’s ancestor. On the other hand, there are some spatial anomalies as an additional and enriching the general Hulu-Teben concept. Those are related with their local wisdom, it’s not only for appreciating their ancestors (upper level of human being) but it’s also for : (i) the former king of Jaya Pangus and the queen of Ulun Danu Batur (upper level of human being but they’re not ancestors), (ii) the equal level of human being and (iii) lower level of human being (the plantation, the animal and other creature).Keyword : Hulu-Teben spatial “anomalies” Bayung Gede, Custom Villag

Pengembangan Computer Aided Design(CAD) Warna Batik

One of the problem faced by Indonesian batik industry is about environment issue. This is because batik industry uses synthetic dyes on their coloring process. The use of natural dyes for batik makers deemed to be impractical and has many disadvantages, including lack of bright colors, longer process, and more expensive. Therefore, this research aims to reduce the use of synthetic dye in batik design process, by developing computer aided batik color design (CAD for batik color). This development includes a method for predicting color, methods and algorithms used in the CAD and measurement of its usability level. The results showed that the method can predict color with average error rate of 5% (< 10% tolerance error established), CAD for batik color has been able to run as the concept of batik making, and its usability average value is 3.86. Therefore, it is concluded that CAD for batik color has usability aspects and can be implemented as a design batik color tool that can be operated by its user.Keywords: batik, creative, design, CAD, colo

Retrofitting Sambungan Kolom-Balok Beton Bertulang Ekspansi Planar Segitiga dengan Variasi Ukuran

Highly seismic activities in Indonesia, that is followed by a lot of high magnitude earthquakes, make awareness of the people to anticipate the damage that caused by this disaster. The Codes of earthquake have changed and are accompanied by the change of seismic region. There must be some efforts to improve the existing building structure. One of the efforts is retrofitting the beam-column joint which is the weakest element of structure in the building when subjected to earthquake loading. Four beam-column joint reinforced concrete specimens, namely SJC, SJ-01, SJ-02, and SJ-03, made of normal concrete and plain reinforcement were tested in this experimental program. Beam with 150 mm width, 250 mm high, and 1500 length be jointed with column that has section area of 250 mm x 250 mm, and 1750 mm length. The specimens of SJ-01, SJ-02 and SJ-03 were retrofitted by triangular voute in lower side of the beam in the beam column joint region with 125 mm, 187.5 mm, and 250 mm side length, respectively. All specimens are tested with cyclic loading using hydraulic actuator. The results show that the increasing strength of specimen SJ-01 and SJ-03 compare to the reference specimen were 12.74% and 10.29%, respectively. While the strength of specimen SJ-02 a little bit decreasescompare to the reference specimen.Keywords: beam-column joint, reinforced concrete, retrofitting, voute, cyclic loading

Pengaruh Jenis Edukasi Terhadap Performansi Pengemudi dengan Karakter Risk Taker

The Government has made traffic laws and regulations to create a motor vehicle safety and in order to reduce the number of fatal and serious injuries that occur in motor vehicle crashes every year. However, it’s not much effecting to diminish numbers of road accident causing by lack of knowledge, insights, driving experience, and often to take a risk. This study aimed to identify the effective education in safety driving to improve the driver’s performance which has a risk taker characteristic. This study was conducted in a laboratory simulation of ergonomics with the respondent amounted 30 people aged 18-25 years and classified into three groups: 10 respondents are educated by using a module, 10 respondents are educated by watching a video, and 10 respondents directly practice using a simulator. Holt & Laury’s Questionnaire is used to knowing Risk Attitude of respondents. This study showed that video education is the most effective education to reduce a numbers of driving perform interference for those man and woman’s respondents and afterwards followed by module’s education and the last intended by without educationKeywords: risk taker, impaired driving performance, performance time on a task

Pemilihan Fitur untuk Monitoring dan Klasifikasi Kondisi Pahat

Tool Condition Monitoring system (TCM) is an application for monitoring  condition of tool where mounted on a CNC machining system. A good of TCM application is that which is capable of features mapping the signals obtained from the sensor system to appropriate class (tool condition). This study aimed to optimizing the dataset from the sensor signal in the previous study, with the features selection or features reduction, and with optimization parameters decision-making system to separate the two conditions,that is normal tool and breakage tool.There are 1800x282 dimensional data, where obtained from the two transformed feature in the time domain and frequency domain. The results of the transformation are selected features by comparing three methods of feature selection that is Fishers Discriminant Ratio (FDR), Sequential Forward Selection (SFS). The result of selected method is L-SVM, and there are selected 10 best features by FDR to be input to the neural network backpropagation method. The system had accuracy test 97,8% in normal conditon of tool and 98,9% in breakage condition of tool. Reduction feature by Principal component Analysis (PCA) it's using from selected feature. It takes for understanding how spindle rotate influence to classification the tool condition.Keywords: Optimization, Feature Selection, Feature Reduction, Tool Condition Monitoring, Neural Network

Aplikasi Isotop Alam untuk Mengetahui Asal-Usul Air Umbul Cokro, Kecamatan Tulung, Kabupaten Klaten

Determination of the goundwater origin of Umbul (spring) Cokro, at Klaten has been done by using environmental isotope tracers, i.e. carbon-13, deuterium, and oxygen-18. Groundwater samples were taken from springs and wells in surround of it, i.e. Wajong Wetan, Kemiri, Karang Podang, Sodong, and Karang Kendal. In the mean time, determination of groundwater genesis has been conducted by analyzing the composition of deuterium (2H) and oxygen-18 (18O) using mass spectrometer. While the direction of groundwater which has the same genesis is determined by analyzing of carbon-13 composition and will be verified by hydraulic gradient.If the composition of sample from suround is almost equal with sample from spring, hence groundwater from well flows to spring.The result of this research showed that δ13C composition of each sample is -12,92 + 4,20 until 5,56 + 4,31 o/oo PDB, that means that the sample include in Groundwater DissolvedInorganic Carbon; while analysis of deuterium and oxygen-18 indicated that composition of groundwater molecule in Sodong, Karang Podang, and Karang Kendal are almost equal to the spring, with δD composition = -52,00 + 0,77 o/oo and δ18O composition = -9,16 + 0,28 o/oo to Standard Mean Ocean Water (SMOW). Based on those results, groundwater of Umbul Cokro originally from Sodong, Karang Podang, and Karang Kendal.Keywords: groundwater, recharge area, Umbul Cokro, environmental isotope tracer

Pengembangan Metode Pembuatan Molding Injeksi Plastik dari Serbuk Komposit

Aluminium-particulate glass matrices composites generally use the pressure in the making of green parts/green specimens before heating at sintering temperature.The purpose of this research is to develop the glass composites that it can be used as a material for indirect layer manufacturing, especially used for making plastic injection mold/insert mold. To achieve these goals, the flexural strength and dimensional errors were studied.Starting materials consist of the mixture of glass powders, aluminium powders, and acrylic powders in the volume ratio of 1 : 1 : 1. The glass powders and aluminium powders wererecovered from waste materials. The size of acrylics and glass particles was lower than 0.074 mm and aluminium particles size was lower than 0.297 mm respectively. Green specimens were made by using indirect layer manufacturing processes, while sintered specimens obtained by heating the green specimens in a furnace at a temperature of 700°C for 1 hour. Finished specimens were made by impregnation process of sintered specimens using epoxy resin.The bending strength of green specimens, sintered specimens, and finished specimens is 20 kg/cm2, 80 kg/cm2, and 170 kg/cm2 respectively. Maximum dimensional error of green specimens and sintered specimens is 50% and 40% respectively. Insert mold made by indirect layer manufacturing is broken after producing as many as 120 pieces of plastic products.Keywords: glass matrix composite, insert mold, dimensional error, bending strength

Analisis Pengaruh Jumlah Responden pada Evaluasi Usabilitas Aplikasi Edukasi Anak-Anak

     The development in technology for children is now increasing. In order to make the design and appearance of a software/application is easy to operate, run, and understood by children, an usability test is needed. One method that popular in usability testing is thinking aloud that takes at least 3-5 samples so the optimal problem can be found during test. This study aims to determine whether the needs of the number of respondents in the thinking aloud method is still relevant today, especially when applied to children, and to determine the effect of number of children involved in the test on usability problems found.This study involved 10 children assubjects with a mean age of 10,6 years to play educational application that run on Apple Ipad 2 named Candy Factory. However, the number of respondents in usability test on children's educational application has the effect that the more the number of respondents, the more problems found but only up to 4 respondents. More than 4 respondents, the usability problems that found is decreasing because the children keep revealing the same problem. One respondentwas able to found 45,45% usability problems, and 85% usability problems found by only 4 respondents. While 100 % usability problems can be found by 9 respondents. Moreover, the result of usability test analysis and recommendations for improvement of Candy Factory are explained.Keywords: usability, number of respondent, thinking aloud, educational game, childre