Entity

Time filter

Source Type

Manado, Indonesia

Infantano A.,Indonesian Air Force Academy | Wahyudi A.K.,Klabat University
Proceedings of 2014 International Conference on Electrical Engineering and Computer Science, ICEECS 2014 | Year: 2014

The firing exercise of air-to-ground rocket should be run safely. The result and evaluation were to be reported quickly. Generally, the Weapon Impact Scoring Systems (WISS) displayed the rocket impact point by using PC monitor at a fixed location. This may produce the gap of real time information which expected by all safety components of exercise. In this paper, we proposed a novel system to visualize results of the rocket firing exercise anytime, anywhere, and realtime. The system called ARoket was developed based on the markerless Augmented Reality and run on Android-based smartphone. ARoket was integrated with current method of the rocket detection, Image Subtraction and 3D-View geometry. It displayed process of how the rocket hit the target which informed some important data such as the position of the rocket explosion and its angle when hitting the target area, which were extracted from the cloud database and visualized in 3D. This proposed system succeded to display the rocket trajectory on the firing range based on the output of WISS which were sent to the internet cloud database. The interchangeable maps installed in the Military Strategic Desk represented the firing range and its environment. By using smartphones in any different places, all officers who related to the firing exercise kept watching the screen of devices to observe the process of the rocket hitting the firing range, and evaluated the results quickly. This proposed system could be contributed to improve the quality and safety level of the exercise thoroughly, even in military or other aspects. © 2014 IEEE. Source


Liem A.T.,Klabat University
2013 International Conference on Quality in Research, QiR 2013 - In Conjunction with ICCS 2013: The 2nd International Conference on Civic Space | Year: 2013

The P2P lives streaming nowadays becomes more popular and begins to take a larger share of bandwidth together with the Internet video calling. Furthermore, a large scale peer-to-peer (P2P) live streaming has recently been successfully and commercially deployed to provide either live streaming or on-demand video streaming. Cisco predicts that 60% of video traffic worldwide will be consumed by these P2P applications in 2015, which is enough to make any Internet Service Provider (ISP) straitened. In particular, the major challenge that has received significant attention is that many network oblivious P2P applications without locality awareness of ISP boundaries that lead to inefficient Internet resource utilization due to the Inter-ISP traffic cost. Consequently, we propose P2P locality awareness architecture in Ethernet Passive Optical Network (EPON) that mitigates Inter-ISP traffic by optimizing peering locality for P2P live streaming. We design mechanisms in ONU. These mechanisms can reduce inefficient Internet resource utilization at the server sides and improve each peer QoS. © 2013 IEEE. Source


Nikoukar A.A.,Yuan Ze University | Nikoukar A.A.,Yasouj University | Hwang I.-S.,Yuan Ze University | Liem A.T.,Klabat University | Wang C.-J.,Yuan Ze University
Photonic Network Communications | Year: 2015

Ethernet passive optical network (EPON) is a broadband access time-division multiplexing passive optical network technology which can be referred to as green network, as it has less power consumption compared with other networks. The optical network unit (ONU) is the best candidate to implement energy-saving adjustments in EPON. Turning off the ONU transmitter (Tx)/receiver (Rx) for substantial time is a common method to achieve the energy saving. However, setting overlong sleep duration decreases the QoS, while short sleep duration increases the ONU power consumption. The challenging issue is how to balance the trade-off between achieving energy saving and guaranteeing QoS. In this paper, we introduce an enhanced EPON architecture and a QoS-aware energy-saving mechanism to reduce ONU energy consumption and guarantee an overall QoS metric based on the ITU-T standards requirements. To achieve the energy saving in the upstream/downstream direction, two sleep durations are defined for the ONU’s Tx/Rx to generate four ONU modes including active, transmission, doze, and sleep. Simulation results show that the proposed scheme improves the energy efficiency 44 % in average to fulfill the QoS metrics in terms of packet loss, delay and jitter, and the buffer requirement. © 2015, Springer Science+Business Media New York. Source


Wielgoss A.,University of Gottingen | Wielgoss A.,University of Wurzburg | Clough Y.,University of Gottingen | Fiala B.,University of Wurzburg | And 2 more authors.
Journal of Applied Ecology | Year: 2012

1.Herbivores inducing host-plant trait changes can indirectly affect the performance, distribution, abundance and behaviour of other herbivores, even when they are temporally or spatially separated. However, it is unclear whether this occurs at scales relevant for applied purposes such as pest control in agricultural crops. 2.We studied the indirect effects of a minor pest, the mirid bug Helopeltis sulawesi, on the major pest of cacao Theobroma cacao in Southeast Asia, the pod-boring moth Conopomorpha cramerella. For 2years, we surveyed herbivore damage and yield in 10 focal trees in each of the 43 cacao plantations and analysed patterns of co-occurrence of the two herbivores. In a two-choice experiment, we tested whether gravid females of C. cramerella searching for oviposition sites discriminate against pods damaged by H. sulawesi. 3.The proportion of pods affected by both pest species was significantly lower than expected. This pattern could not be ascribed to differential responses to environmental or management variables, but was because of avoidance of H. sulawesi damage by ovipositing C. cramerella females as shown in a two-choice experiment. The reduction in co-occurrence of damage by the two herbivores was found at tree and at plot scale and held across three harvest seasons. 4.The differential yield impacts by the two herbivores and the avoidance by C. cramerella of pods damaged by H. sulawesi lead to a yield optimum at a H. sulawesi incidence of 51%. 5.Synthesis and application. Plant-mediated indirect interactions between minor and major pest insects can be important drivers of yield loss at agriculturally relevant spatial and temporal scales. In cacao, the mirid bug H. sulawesi, a minor pest, generates conspicuous damage which often triggers pest control with insecticides. This practice may be counterproductive, because decreasing H. sulawesi damage benefits the main pest, the cacao pod borer C. cramerella resulting in a marketable yield optimum at intermediate densities of the minor pest. Pest control recommendations should take into account the relative effect of control measures on interacting herbivores to avoid replacing one pest problem with another, potentially more serious one, during the course of a fruiting season. © 2012 The Authors. Journal of Applied Ecology © 2012 British Ecological Society. Source


Hwang I.-S.,Yuan Ze University | Nikoukar A.,Yasouj University | Su Y.-M.,Yuan Ze University | Liem A.T.,Klabat University
Journal of Optical Communications and Networking | Year: 2016

An Ethernet passive optical network (EPON) has the least energy consumption among access network technologies and is the best candidate for improving energy consumption by time utilization. Current studies have proposed OLT-initiated schemes to turn off the transmitter/receiver of an optical network unit (ONU) for a substantial time in order to achieve energy savings. In this paper, a new SIEPON-based ONU-initiated energy-saving mechanism is proposed in which the ONU calculates the transmitter (Tx) sleep duration based on the current queue state and maximum boundary delay requirements and forwards it to the OLT; then, the OLT calculates the ONU's receiver (Rx) sleep duration and decides the ONU's sleeping mode in Tx or TRx sleep mode. Furthermore, the Sleep manager and Green DBA and TRx controller components are proposed in the OLT and ONU architectures to more precisely manage the energy-saving mechanism. Simulation results show that the proposed energy-saving mechanism significantly improves energy savings up to 47% and 42% in the up-and downstream directions, respectively, and guarantees the QoS requirement in terms of mean packet delay, packet loss, throughput, and jitter. Moreover, the proposed energysaving mechanism has better delay performance compared with the OLT-initiated energy-saving mechanism such as upstream centric scheduling. © 2016 OSA. Source

Discover hidden collaborations