The ASEAN Economic Community (AEC) is an initiative of ASEAN countries to realize ASEAN into a solid and calculated economic area in the international economic arena. Human Development Index (HDI) is a method used to measure the success or failure of a country or region in the field of human development. The economic growth of ASEAN countries and tourism sectors is very important for the improvement of the HDI. This study uses a quantitative method with panel data secondary to the 2011-2015 period by combining 10 ASEAN countries. The HDI in ASEAN countries is already good, it can be explained that Singapore is the country that has the highest HDI while Myanmar, Laos and Cambodia are the countries that have the lowest Human Development Index. To overcome the increasing human development index in Myanmar, Laos and Cambodia, an open economy needs to be improved by conducting international trade. Digital technology is needed to further accelerate the economy of openness. Government policies of the three countries are to be more open in their economy. It is hoped that the policies of these three countries can contribute to creating a prosperous society in ASEAN countries and having a parallel HDI.

Technology developments related to the renewable energy industry are increasing, one example of wind power generation technology which has several relationship configurations with generator. This system configuration is known a wind generator with a DFIG (Double Fed Induction Generator). This system can supply active power from the induction generator stator connected directly to the network while the rotor is connected to the network through a back to back converter. The operation of the double feeder induction generator (DFIG) consists of two conditions, the first condition is super-synchronous where power will be transmitted from the rotor through the converter to the network and the second condition is sub-synchronous where the rotor will absorb power from the network through the converter. This research was conducted to determine the active power distribution in two operating conditions of a double feeder induction generator. Generator power delivery increases for sub-synchronous and super-synchronous operation when active MSC increases from 10% to 60% and generator speed is constant. For a changing speed and a constant active MSC, constant power distribution from the generator (PDFIG) is obtained.

Dalam artikel ini, metode analisis homotopi digunakan untuk menyelesaikan suatu model Lotka-Volterra dari dua spesies yang bersaing. Dalam hal ini akan ditentukan suatu penyelesaian berupa semi-analitik dari model tersebut. Metodologi penelitian yang dilakukan diawali dengan mendefinisikan suatu operator linear berdasarkan model Lotka-Volterra yang ditinjau, kemudian mengonstruksi suatu persamaan deformasi. Berdasarkan persamaan deformasi ini diperoleh suatu hampiran penyelesaian. Penyelesaian hampiran dari model yang dikaji menunjukkan galat yang relatif kecil. Dalam artikel ini juga diberikan simulasi bahwa jika tingkat intrinsik spesies satu mengalami peningkatan dari 8% hingga 50%, tetapi tingkat intrinsik spesies dua dibuat tetap, maka hasil simulasi menunjukkan bahwa jumlah populasi spesies satu mengalami peningkatan, sedangkan jumlah spesies dua mengalami penurunan.

In this article, we derive simple formulations of the eigenvalues, determinants, and also the inverse of circulant matrices whose entries in the first row form an arithmetic sequence. The formulation of the determinant and inverse is based on elementary row and column operations transforming the matrix to an equivalent diagonal matrix so that the formulation is obtained easily. Meanwhile, for the eigenvalues formulation, we simplify the known result of formulation for the general circulant matrices by exploiting the properties of the cyclic group induced by the set of all roots of  as the set of points in the unit circle in the complex plane, and also by considering the specific property of arithmetic sequence. Then, we construct an algorithm for the eigenvalues formulation. This algorithm shows a better computation compared to the previously known result for the general case of circulant matrices.

The function of grounding is to neutralize disturbances that occur in electric voltages such as short circuits and leakage currents in equipment. So the grounding system that already used will be able to drain the disturbance that occurs due to leakage currents or short circuits to the grounding terminal and then delivered again to the conduit or conductor and then delivered again to the grounding pole or electrode, then the electrode will neutralize it to the ground. In regard to this point, the grounding system is expected to minimize damage to equipment due to interference with electrical voltage. The smaller the grounding resistance value, the better the grounding system. The results of the analysis show that the value of grounding resistance will be smaller if the depth of planting, the number of electrodes planted, and the planting distance are increased. The Tomat feeder distribution substation itself still has grounding values that are not in accordance with the PUIL standard, article 3.13.2.10. This is due to the lack of moisture in the soil.