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1. Impact of Traffic-Following on Order of Autonomous Airspace Operations

Author

Jain, Anahita, Idris, Husni R., and Clarke, John-Paul

Subjects
Computer Science - Multiagent Systems, Computer Science - Computational Engineering, Finance, and Science, Computer Science - Emerging Technologies, Electrical Engineering and Systems Science - Systems and Control
Abstract

In this paper, we investigate the dynamic emergence of traffic order in a distributed multi-agent system, aiming to minimize inefficiencies that stem from unnecessary structural impositions. We introduce a methodology for developing a dynamically-updating traffic pattern map of the airspace by leveraging information about the consistency and frequency of flow directions used by current as well as preceding traffic. Informed by this map, an agent can discern the degree to which it is advantageous to follow traffic by trading off utilities such as time and order. We show that for the traffic levels studied, for low degrees of traffic-following behavior, there is minimal penalty in terms of aircraft travel times while improving the overall orderliness of the airspace. On the other hand, heightened traffic-following behavior may result in increased aircraft travel times, while marginally reducing the overall entropy of the airspace. Ultimately, the methods and metrics presented in this paper can be used to optimally and dynamically adjust an agent's traffic-following behavior based on these trade-offs.

Published
2024

2. Initial Study of Tailored Trajectory Management for Multi-Vehicle Uncrewed Regional Air Cargo Operations

Author

Thipphavong, David P., primary, Lauderdale, Todd A., additional, Windhorst, Robert D., additional, Arneson, Heather M., additional, Idris, Husni R., additional, Coppenbarger, Richard A., additional, Sakakeeny, Jordan A., additional, Dimitrova, Nadezhda, additional, Bulusu, Vishwanath, additional, Chatterji, Gano B., additional, and Aweiss, Arwa S., additional

Published
2023
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5. Urban Air Mobility Airspace Integration Concepts and Considerations

Author

Thipphavong, David P, Apaza, Rafael D, Barmore, Bryan E, Battiste, Vernol, Belcastro, Christine M, Burian, Barbara K, Dao, Quang V, Feary, Michael S, Go, Susie, Goodrich, Kenneth H, Homola, Jeffrey R, Idris, Husni R, Kopardekar, Parimal H, Lachter, Joel B, Neogi, Natasha A, Ng, Hokkwan, Oseguera-Lohr, Rosa M, Patterson, Michael D, and Verma, Savita A

Subjects
Aircraft Communications And Navigation
Abstract

Urban Air Mobility (UAM) - defined as safe and efficient air traffic operations in a metropolitan area for manned aircraft and unmanned aircraft systems - is being researched and developed by industry, academia, and government. Significant resources have been invested toward cultivating an ecosystem for Urban Air Mobility that includes manufacturers of electric vertical takeoff and landing aircraft, builders of takeoff and landing areas, and researchers of the airspace integration concepts, technologies, and procedures needed to conduct Urban Air Mobility operations safely and efficiently alongside other airspace users. This paper provides high-level descriptions of both emergent and early expanded operational concepts for Urban Air Mobility that NASA is developing. The scope of this work is defined in terms of missions, aircraft, airspace, and hazards. Past and current Urban Air Mobility operations are also reviewed, and the considerations for the data exchange architecture and communication, navigation, and surveillance requirements are also discussed. This paper will serve as a starting point to develop a framework for NASA's Urban Air Mobility airspace integration research and development efforts with partners and stakeholders that could include fast-time simulations, human-in-the-loop (HITL) simulations, and flight demonstrations.

Published
2018

6. Cooperative Automation Supporting Pilot-Dispatch Negotiation of Enroute Trajectory Change Requests

Author

Idris, Husni R, Harrison, Stephanie J, and Wing, David J

Subjects
Air Transportation And Safety
Abstract

The advent of advanced technologies in communication, navigation, and surveillance is enabling more integration between the aircraft and the ground systems in managing air traffic operations. As a result, automation has evolved to provide the flight crew, air traffic controllers, and traffic flow managers with capabilities for collaborating on information access, analysis, and decision making. In this paper, we investigate different cooperative schemes between these agents, supported by automation, in managing dynamic trajectory changes while the flight is en route to improve flight and system performance. The analysis was conducted using an abstract cognitive tasking framework to identify trajectory change tasks independently from the agent performing them. Cooperation schemes were then derived by assessing different levels of cooperation on each task between the air and ground agents and their automation. The assessment was based on which automation-supported agent is more capable of performing the task and the expected benefit mechanisms that result from cooperating. The cooperation schemes were compared based on a qualitative, but objective, assessment of the benefits expected from cooperation.

Published
2018

19. The present and future disease burden of hepatitis C virus infections with todayʼs treatment paradigm – volume 3

Author

Sibley, A., Han, K. H., Abourached, A., Lesmana, L. A., Makara, M., Jafri, W., Salupere, R., Assiri, A. M., Goldis, A., Abaalkhail, F., Abbas, Z., Abdou, A., Al Braiki, F., Al Hosani, F., Al Jaberi, K., Al Khatry, M., Al Mulla, M. A., Al Quraishi, H., Al Rifai, A., Al Serkal, Y., Alam, A., Alavian, S. M., Alashgar, H. I., Alawadhi, S., Al-Dabal, L., Aldins, P., Alfaleh, F. Z., Alghamdi, A. S., Al-Hakeem, R., Aljumah, A. A., Almessabi, A., Alqutub, A. N., Alswat, K. A., Altraif, I., Alzaabi, M., Andrea, N., Babatin, M. A., Baqir, A., Barakat, M. T., Bergmann, O. M., Bizri, A. R., Blach, S., Chaudhry, A., Choi, M. S., Diab, T., Djauzi, S., El Hassan, E. S., El Khoury, S., Estes, C., Fakhry, S., Farooqi, J. I., Fridjonsdottir, H., Gani, R. A., Ghafoor Khan, A., Gheorghe, L., Gottfredsson, M., Gregorcic, S., Gunter, J., Hajarizadeh, B., Hamid, S., Hasan, I., Hashim, A., Horvath, G., Hunyady, B., Husni, R., Jeruma, A., Jonasson, J. G., Karlsdottir, B., Kim, D. Y., Kim, Y. S., Koutoubi, Z., Liakina, V., Lim, Y. S., Löve, A., Maimets, M., Malekzadeh, R., Matičič, M., Memon, M. S., Merat, S., Mokhbat, J. E., Mourad, F. H., Muljono, D. H., Nawaz, A., Nugrahini, N., Olafsson, S., Priohutomo, S., Qureshi, H., Rassam, P., Razavi, H., Razavi-Shearer, D., Razavi-Shearer, K., Rozentale, B., Sadik, M., Saeed, K., Salamat, A., Sanai, F. M., Sanityoso Sulaiman, A., Sayegh, R. A., Sharara, A. I., Siddiq, M., Siddiqui, A. M., Sigmundsdottir, G., Sigurdardottir, B., Speiciene, D., Sulaiman, A., Sultan, M. A., Taha, M., Tanaka, J., Tarifi, H., Tayyab, G., Tolmane, I., Ud din, M., Umar, M., Valantinas, J., Videčnik-Zorman, J., Yaghi, C., Yunihastuti, E., Yusuf, M. A., Zuberi, B. F., and Schmelzer, J. D.

Published
2015
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20. Historical epidemiology of hepatitis C virus (HCV) in select countries – volume 3

Author

Liakina, V., Hamid, S., Tanaka, J., Olafsson, S., Sharara, A. I., Alavian, S. M., Gheorghe, L., El Hassan, E. S., Abaalkhail, F., Abbas, Z., Abdou, A., Abourached, A., Al Braiki, F., Al Hosani, F., Al Jaberi, K., Al Khatry, M., Al Mulla, M. A., Al Quraishi, H., Al Rifai, A., Al Serkal, Y., Alam, A., Alashgar, H. I., Alawadhi, S., Al-Dabal, L., Aldins, P., Alfaleh, F. Z., Alghamdi, A. S., Al-Hakeem, R., Aljumah, A. A., Almessabi, A., Alqutub, A. N., Alswat, K. A., Altraif, I., Alzaabi, M., Andrea, N., Assiri, A. M., Babatin, M. A., Baqir, A., Barakat, M. T., Bergmann, O. M., Bizri, A. R., Blach, S., Chaudhry, A., Choi, M. S., Diab, T., Djauzi, S., El Khoury, S., Estes, C., Fakhry, S., Farooqi, J. I., Fridjonsdottir, H., Gani, R. A., Ghafoor Khan, A., Goldis, A., Gottfredsson, M., Gregorcic, S., Hajarizadeh, B., Han, K. H., Hasan, I., Hashim, A., Horvath, G., Hunyady, B., Husni, R., Jafri, W., Jeruma, A., Jonasson, J. G., Karlsdottir, B., Kim, D. Y., Kim, Y. S., Koutoubi, Z., Lesmana, L. A., Lim, Y. S., Löve, A., Maimets, M., Makara, M., Malekzadeh, R., Matičič, M., Memon, M. S., Merat, S., Mokhbat, J. E., Mourad, F. H., Muljono, D. H., Nawaz, A., Nugrahini, N., Priohutomo, S., Qureshi, H., Rassam, P., Razavi, H., Razavi-Shearer, D., Razavi-Shearer, K., Rozentale, B., Sadik, M., Saeed, K., Salamat, A., Salupere, R., Sanai, F. M., Sanityoso Sulaiman, A., Sayegh, R. A., Schmelzer, J. D., Sibley, A., Siddiq, M., Siddiqui, A. M., Sigmundsdottir, G., Sigurdardottir, B., Speiciene, D., Sulaiman, A., Sultan, M. A., Taha, M., Tarifi, H., Tayyab, G., Tolmane, I., Ud din, M., Umar, M., Valantinas, J., Videčnik-Zorman, J., Yaghi, C., Yunihastuti, E., Yusuf, M. A., Zuberi, B. F., and Gunter, J.

Published
2015
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21. Strategies to manage hepatitis C virus infection disease burden – volume 3

Author

Alfaleh, F. Z., Nugrahini, N., Matičič, M., Tolmane, I., Alzaabi, M., Hajarizadeh, B., Valantinas, J., Kim, D. Y., Hunyady, B., Abaalkhail, F., Abbas, Z., Abdou, A., Abourached, A., Al Braiki, F., Al Hosani, F., Al Jaberi, K., Al Khatry, M., Al Mulla, M. A., Al Quraishi, H., Al Rifai, A., Al Serkal, Y., Alam, A., Alashgar, H. I., Alavian, S. M., Alawadhi, S., Al-Dabal, L., Aldins, P., Alghamdi, A. S., Al-Hakeem, R., Aljumah, A. A., Almessabi, A., Alqutub, A. N., Alswat, K. A., Altraif, I., Andrea, N., Assiri, A. M., Babatin, M. A., Baqir, A., Barakat, M. T., Bergmann, O. M., Bizri, A. R., Chaudhry, A., Choi, M. S., Diab, T., Djauzi, S., El Hassan, E. S., El Khoury, S., Estes, C., Fakhry, S., Farooqi, J. I., Fridjonsdottir, H., Gani, R. A., Ghafoor Khan, A., Gheorghe, L., Goldis, A., Gottfredsson, M., Gregorcic, S., Gunter, J., Hamid, S., Han, K. H., Hasan, I., Hashim, A., Horvath, G., Husni, R., Jafri, W., Jeruma, A., Jonasson, J. G., Karlsdottir, B., Kim, Y. S., Koutoubi, Z., Lesmana, L. A., Liakina, V., Lim, Y. S., Löve, A., Maimets, M., Makara, M., Malekzadeh, R., Memon, M. S., Merat, S., Mokhbat, J. E., Mourad, F. H., Muljono, D. H., Nawaz, A., Olafsson, S., Priohutomo, S., Qureshi, H., Rassam, P., Razavi, H., Razavi-Shearer, D., Razavi-Shearer, K., Rozentale, B., Sadik, M., Saeed, K., Salamat, A., Salupere, R., Sanai, F. M., Sanityoso Sulaiman, A., Sayegh, R. A., Schmelzer, J. D., Sharara, A. I., Sibley, A., Siddiq, M., Siddiqui, A. M., Sigmundsdottir, G., Sigurdardottir, B., Speiciene, D., Sulaiman, A., Sultan, M. A., Taha, M., Tanaka, J., Tarifi, H., Tayyab, G., Ud din, M., Umar, M., Videčnik-Zorman, J., Yaghi, C., Yunihastuti, E., Yusuf, M. A., Zuberi, B. F., and Blach, S.

Published
2015
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23. Dynamic State Estimation of a High-Order Model of Doubly-Fed Induction Generator Using Unscented Kalman Filter

Author

Alif Ravi Ramadhan, Husni Rois Ali, and Roni Irnawan

Subjects
Doubly fed induction generator, dynamic state estimation, power system monitoring, unscented Kalman filter, wind power generation, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

The utilization of renewable energy in power generation has been increasing in recent years, with the use of wind power sources being the most promising solution for sustainable power generation. The doubly-fed induction generator (DFIG) is one of the most commonly used generators in wind power generation applications, as it offers some technical of advantages. However, the increasing penetration of wind power generation poses tremendous technical challenges in power system operation as this can potentially affect system stability, requiring better control and monitoring schemes. Dynamic state estimation (DSE) offers the ability to achieve this purpose. With respect to this, the present paper proposes a DSE framework on a high-order model of DFIG consisting of 18 states. The method uses the unscented Kalman filter (UKF) which provides an accurate estimate of DFIG states under a strong system non linearity present in the wind turbine system. Furthermore, this paper demonstrates the robustness of the proposed method under different faults and noisy conditions. Finally, the paper also extends the use of UKF to estimate the unknown inputs of a DFIG system, such as control references in the rotor-side converter (RSC) and grid-side converter(GSC).

Published
2024
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27. Trajectory Planning by Preserving Flexibility: Metrics and Analysis

Author

Idris, Husni R, El-Wakil, Tarek, and Wing, David J

Subjects
Air Transportation And Safety
Abstract

In order to support traffic management functions, such as mitigating traffic complexity, ground and airborne systems may benefit from preserving or optimizing trajectory flexibility. To help support this hypothesis trajectory flexibility metrics have been defined in previous work to represent the trajectory robustness and adaptability to the risk of violating safety and traffic management constraints. In this paper these metrics are instantiated in the case of planning a trajectory with the heading degree of freedom. A metric estimation method is presented based on simplifying assumptions, namely discrete time and heading maneuvers. A case is analyzed to demonstrate the estimation method and its use in trajectory planning in a situation involving meeting a time constraint and avoiding loss of separation with nearby traffic. The case involves comparing path-stretch trajectories, in terms of adaptability and robustness along each, deduced from a map of estimated flexibility metrics over the solution space. The case demonstrated anecdotally that preserving flexibility may result in enhancing certain factors that contribute to traffic complexity, namely reducing proximity and confrontation.

Published
2008

28. Prevalence of Parent-Reported Food Allergies Among Children in Saudi Arabia

Author

Ibrahim Alibrahim, Maria AlSulami, Turki Alotaibi, Ruba Alotaibi, Elaf Bahareth, Inam Abulreish, Sumayyah Alsuruji, Imad Khojah, Loie Goronfolah, Husni Rayes, Ameera Bukhari, and Amer Khojah

Subjects
food allergy, atopy, pediatric allergy, Saudi Arabia, Nutrition. Foods and food supply, TX341-641
Abstract

(1) Background: Food allergy (FA) is an immune-mediated hypersensitivity to foods, significantly contributing to childhood morbidity and mortality. This study aimed to assess the prevalence, characteristics, and influencing factors of parent-reported FAs among children in Saudi Arabia. (2) Methods: This cross-sectional study utilized a validated parental questionnaire distributed across all regions of Saudi Arabia. Data from 2130 participants were collected and analyzed using SPSS v. 26 and Prism software v. 10.3.0. (3) Results: Parent-reported FA prevalence was 15.2%. Egg was the most common allergen (6.2%), followed by tree nuts (4.1%), peanuts (4.0%), milk (3.8%), and sesame (3.2%). Significant geographical variations were observed, with the western region having the highest burden (p < 0.001). Older children had higher rates of shellfish and fish allergies. Parental allergies and co-existing asthma/drug allergies were positively associated with childhood FAs. (4) Conclusions: This study highlights a substantial burden of parent-reported FAs in Saudi Arabia, with regional variations in food allergen distribution. Parental allergies and co-existing allergic conditions may influence FA risk.

Published
2024
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30. Implementation And Implication Of The Arabic Curriculum at MAN 1 Metro Lampung

Author

Kuliyatun Kuliyatun, prabowo Adi Widayat, Husni Rahim, and Ahmad Thib Raya

Subjects
implementation, implication, curriculum, arabic language, madrasah aliyah negeri, Theory and practice of education, LB5-3640, Islam, BP1-253
Abstract

This study aims to elucidate the implementation and implications of the Arabic language curriculum for students at Madrasah Aliyah Negeri 1 in Metro Lampung City. The study examines the application of the curriculum and the outcomes it yields for students. The study utilized a descriptive qualitative approach for research and collected data through interviews and analyzing MAN 1 Arabic curriculum documents in Metro City. The implementation of the Arabic language curriculum during the reform era, from KBK and KTSP to the 2013 Curriculum, has affected students' Arabic language proficiency. The findings indicate that the Arabic language curriculum's execution aligns with academic conventions and supports student learning. The study reveals that the implementation of the Arabic language curriculum runs smoothly in Madrasah Aliyah Negeri 1 Metro City. The teacher regularly evaluates students through questions on the categorization of Arabic words - isim, fi'il, and letters- and their associated divisions and characteristics. As part of this process, students must memorize and comprehend 200-300 vocabularies and engage in spoken communication in Arabic. The teacher serves as a facilitator and guide to aid students in learning the language. The new curriculum's implications for teaching and learning activities are relevant, although objective evaluations are required. Students can learn independently and think critically, enhancing their linguistic abilities. The field provides substantial opportunities for students to broaden their knowledge and understanding of the Arabic language.

Published
2024
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31. A Conceptual Design of a Departure Planner Decision Aid

Author

Anagnostakis, Ioannis, Idris, Husni R, Clark, John-Paul, Feron, Eric, Hansman, R. John, Odoni, Amedeo R, and Hall, William D

Subjects
Aircraft Communications And Navigation
Abstract

Terminal area Air Traffic Management handles both arriving and departing traffic. To date, research work on terminal area operations has focused primarily on the arrival flow and typically departures are taken into account only in an approximate manner. However, arrivals and departures are highly coupled processes especially in the terminal airspace, with complex interactions and sharing of the same airport resources between arrivals and departures taking place in practically every important terminal area. Therefore, the addition of automation aids for departures, possibly in co-operation with existing arrival flow automation systems, could have a profound contribution in enhancing the overall efficiency of airport operations. This paper presents the conceptual system architecture for such an automation aid, the Departure Planner (DP). This architecture can be used as a core in the development of decision-aiding systems to assist air traffic controllers in improving the performance of departure operations and optimize runway time allocation among different operations at major congested airports. The design of such systems is expected to increase the overall efficiency of terminal area operations and yield benefits for all stakeholders involved in Air Traffic Management (ATM) operations, users as well as service providers.

Published
2000

32. Stochastic Unit Commitment in Various System Sizes under High Uncertainty Photovoltaic Forecast

Author

Muhammad Yasirroni, Lesnanto Multa Putranto, Sarjiya, Husni Rois Ali, Indra Triwibowo, and Qiangqiang Xie

Subjects
intermittency, k-means, mixed-integer linear programming, stochastic unit commitment, Engineering (General). Civil engineering (General), TA1-2040
Abstract

This paper proposes a stochastic unit commitment (SUC) approach to solve a day-ahead unit commitment (UC) problem in a system with high uncertainty net load which is caused by photovoltaic (PV) power plants. In contrast with robust unit commitment (RUC) which only considers the worst-case scenario, SUC considers every possible scenario with its probability. Multiple possible PV curves were obtained using k-means clustering on historical data. The proportion of cluster members was used as a weight factor representing the occurrence probability of PV curves. The test was separated into two-step tests, namely day-ahead and real-time markets, using IEEE 10 generating unit system and solved using CPLEX. The results showed that in a day-ahead UC, SUC ($539,896) had lower cost than RUC ($548,005). However, when the total energy generated was considered, the SUC (20.78 $/MWh) cost higher compared to RUC (20.75 $/MWh). It is because the solution proposed by SUC is as robust as the RUC, but the generation cost formulation also considers over-commitment. Thus, SUC produced a fairer price for the independent power producer and electric utility in the day-ahead calculation. The results also showed that in the test environment of the real-time market, SUC was able to produce a robust solution without going into over-commitment. It is clearly shown in a 30 units system test with 10 centroids, in which SUC had a cheaper solution (20.7253 $/MWh) compared to RUC (20.7285 $/MWh), without violating power balance or going to load shedding.

Published
2023
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33. HUBUNGAN PEMANFAATAN PELAYANAN KESEHATAN, ORAL HYGIENE, DAN FAKTOR PERILAKU TERHADAP PENYAKIT GINGIVITIS DI POLI GIGI PUSKESMAS SELAYO KABUPATEN SOLOK TAHUN 2016

Author

RIDHO, HUSNI. R

Subjects
RA0421 Public health. Hygiene. Preventive Medicine, RA Public aspects of medicine
Abstract

Tujuan Penyakit periodontal diderita oleh manusia hampir di seluruh dunia dan mencapai 50% dari jumlah populasi dewasa. Penyakit periodontal merupakan penyakit yang termasuk 3 besar terbanyak di puskesmas selayo selama 3 tahun terahir. Tujuan dari penelitian ini adalah mengetahui hubungan pemanfaatan pelayanan kesehatan, oral hygiene dan faktor perilaku dengan penyakit gingivitis di puskesmas selayo tahun 2016 Metode Penelitian analitik dengan desain cross sectional dan dilakukan di poli gigi puskesmas selayo dari bulan Maret-november 2016 dengan jumlah responden 56 orang. Pengambilan sampel menggunakan teknik consecutive sampling yang mana sampel penelitian diambil ketika waktu penelitian saja bukan sepanjang tahun 2016. Pengolahan data menggunakan analisis univariat dan bivariat dan analisis stratafikasi Hasil Hasil penelitian secara bivariat diperoleh hasil, pemanfaatan pelayanan kesehatan (p=0,01; POR=4,18), oral hygiene (p=0,03; POR=3,5), tingkat pengetahuan (p=0,01; POR=4,08), kebiasaan menyikat gigi (p=0,3; OR=1,7), Hasil analisis stratafikasi didapatkan tingkat pemanfaatan pelayanan kesehatan dengan jenis kelamin (ΔOR=23,03) merupakan confounding, pemanfaatan pelayanan kesehatan dengan umur (ΔOR=7,45) merupakan efek modifikasi, pemanfaatan pelayanan kesehatan dengan pendidikan (ΔOR=41,21). Kesimpulan Terdapat hubungan antara penyakit gingivitis pemanfaatan pelayanan kesehatan, oral hygiene dan pengetahuan. Disarankan kepada Puskesmas Selayo untuk melakukan peningkatan pemanfaatan pelayanan kesehatan, oral hygiene dan pengetahuan, serta meprioritaskan karakteristik responden yang beresiko terhadap penyakit gingivitis. Daftar Pustaka: 48 (1987-2015) Kata Kunci: Pemanfaatan pelayanan kesehatan, Oral hygiene, faktor perilaku, Gingivitis, stratafikasi karakteristik ABSTRACT Objective Periodontal disease suffered by human beings nearly all over the world and reached 50% of the total adult population. Periodontal disease is a disease that includes 3 large majority in the selayo health center during the last 3 years. This research was purposed to asosiation health service, oral hygiene and behavior factors with gingivitis at dental health care of selayo public health center in 2016. Method This study was an analytical research which used cross sectional design at dental health care of selayo public health center.This research was conducted to 61 of respondents who came to dental health care in selayo public health center solok. Sampling using consecutive sampling technique in which samples were taken when the time of the study alone is not the whole 2016. Processing data using univariate and bivariate analysis and stratification analysis Result The results of bivariate result, utilization of health services (p=0,01; POR=4,18), oral hygiene (p = 0:03; POR = 3.5), the level of knowledge (p = 0.01, POR = 4.08), brushing (p = 0.3; OR = 1.7), Stratafikasi analysis results obtained utilization of health services by gender (ΔOR = 23.03) is confounding, utilization of health services by age (ΔOR = 7.45) an effect modification, utilization of health services with education (ΔOR = 41.21). Conclusion There is a relationship between disease gingivitis utilization of health services, oral hygiene and knowledge. suggested to selayo health center to increase the utilization of health services, oral hygiene and knowledge, as well as prioritize the characteristics of respondents who are at risk of disease gingivitis. Reference : 48 (1987- 2015) Key Word : Utilization of health services, oral hygiene, behavior factor, gingivitis disease, stratified by caracteristic

Published
2016

34. Real-time control of the MIT vehicle emulation system

Author

Durfee, William K, Idris, Husni R, and Dubowsky, Steven

Subjects
Cybernetics
Abstract

The MIT vehicle emulation system (VES) is an experimental facility designed to facilitate the study of controlling robots fixed to nonstationary bases. This includes assembly and repair manipulators attached to space vehicles, or to the space shuttle arm, as well as manipulators fixed to the bed of moving ground vehicles. Controlling manipulators under these conditions for endpoint force and positioning tasks requires both the development of new theory, and the development of a testbed for verifying theoretical results through experimentation. A description is presented of the technical details of the real-time controller for the second generation VES system.

Published
1991

35. Urban Air Mobility Airspace Integration Concepts and Considerations

Author

Thipphavong, David P., primary, Apaza, Rafael, additional, Barmore, Bryan, additional, Battiste, Vernol, additional, Burian, Barbara, additional, Dao, Quang, additional, Feary, Michael, additional, Go, Susie, additional, Goodrich, Kenneth H., additional, Homola, Jeffrey, additional, Idris, Husni R., additional, Kopardekar, Parimal H., additional, Lachter, Joel B., additional, Neogi, Natasha A., additional, Ng, Hok Kwan, additional, Oseguera-Lohr, Rosa M., additional, Patterson, Michael D., additional, and Verma, Savita A., additional

Published
2018
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37. Optimasi Sistem Pembangkit Listrik Tenaga Hybrid di Pulau Enggano

Author

Dyah Ayu Kartika Sari, Fransisco Danang Wijaya, and Husni Rois Ali

Subjects
optimasi, pembangkit listrik tenaga hybrid, npc, keberlanjutan lingkungan, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Pulau Enggano merupakan salah satu wilayah terluar yang menggunakan pembangkit listrik tenaga diesel (PLTD) sebagai sumber energi listriknya. PLTD yang mulai beroperasi sejak tahun 2017 ini terdiri atas tiga unit mesin pembangkit yang mampu menghasilkan daya sebesar 730 kW, dengan total pelanggan sebanyak 1.050 pelanggan dan kebutuhan energi listrik sebesar 1.097.883 kWh/tahun. Meskipun pembangkit listrik telah tersedia, pada kenyataannya permasalahan ketenagalistrikan masih menjadi masalah dasar yang belum terselesaikan di pulau ini. Rata-rata pemakaian bahan bakar minyak (BBM) untuk mengoperasikan PLTD adalah 21 ton/bulan atau Rp582.757.000,00 per bulan dengan asumsi harga BBM adalah Rp9.800,00 per liter. Tingginya biaya operasional mengakibatkan listrik hanya dipasok selama enam belas jam per hari. Pemanfaatan PLTD juga menghasilkan emisi karbon dioksida (CO2) yang sangat tinggi. Hal ini tidak sejalan dengan komitmen pemerintah untuk bertransisi menuju net zero emission pada tahun 2060. Pemanfaatan energi baru terbarukan (EBT) yang ditargetkan sebesar 23% pada tahun 2025 nyatanya masih belum maksimal. Makalah ini bertujuan untuk menemukan konfigurasi pembangkit tenaga hybrid yang optimal di Pulau Enggano dari segi teknis dan kelayakan ekonomi. Kelayakan ekonomi ditinjau menggunakan pendekatan net present cost (NPC) dan cost of economic (COE). Selain itu, dilakukan juga analisis keberlanjutan dari aspek lingkungan. Dari penelitian ini, didapatkan konfigurasi yang paling optimal berdasarkan biaya sistem terendah, yaitu konfigurasi 2 skenario 1, yang terdiri atas photovoltaic (PV) 1.005 kW, diesel 250 kW, dan baterai 594 unit. Konfigurasi ini dapat memproduksi listrik sebesar 1.576.115 kWh/tahun dengan nilai NPC mencapai Rp31,7 miliar rupiah dan nilai COE sebesar Rp1.998,75 per kWh. Konfigurasi ini juga memiliki keberlanjutan lingkungan yang baik karena memiliki nilai renewable fraction sebesar 91%.

Published
2022
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38. Annualizing Throughput Benefits at Newark Airport using a New Approach to Converging Runway Operations

Author

Paul U. Lee, Nancy Smith, and Husni R. Idris

Subjects
Transport engineering, Schedule, Engineering, Peak demand, business.industry, Aviation, Next Generation Air Transportation System, Visual flight rules, Runway, business, Throughput (business), Reliability engineering, Scheduling (computing)
Abstract

The New York (NY) area airspace is notoriously complex and demanding, and is responsible for a large portion of the delays and congestion in the United States. A new research effort was initiated to examine the chronic problems associated with NY, and to develop integrated Next Generation Air Transportation System (NextGen) concepts that leveraged existing NASA and other NextGen technologies to reduce delays, increase throughput, and/or improve trajectory efficiencies in this region. This paper describes a concept, tools, and operational procedures for improving flight efficiency and runway throughput for Newark Liberty International airport (EWR) arrivals. The concept increases throughput by extending the Terminal Sequencing and Spacing (TSS) scheduling capability to precisely schedule runway 11 arrivals behind arrivals landing on intersecting runway 22L, thereby maximizing throughput on both runways. A human-in-the-loop (HITL) evaluation of the concept indicated that TSS can enable more energy efficient, trajectorybased optimized profile descent procedures to be used without sacrificing throughput, even in the very challenging New York environment. In addition, the results suggest that the enhancements to TSS to coordinate the threshold times of aircraft landing on converging runways could safely increase throughput for EWR from today’s Visual Flight Rules (VFR) maximum of 52 to 67 arrivals per hour. A follow-up benefits analysis was conducted to identify how often meteorological conditions were suitable for using the 11-22L landing runway configuration, and estimate the actual resulting potential for increasing arrival throughput. Aviation System Performance Metrics (ASPM) data were used to determine the traffic demand, runway configurations, meteorological conditions, and wind magnitudes/directions during 2007, 2009 and 2012. Using fairly conservative assumptions about the meteorological conditions, runway usage, and peak demand characteristics, the analysis showed that the 11-22L runway configuration could have been used more than twice as often during high demand periods (arrival demand exceeds throughput), which in turn could either 1) reduce delays to the impacted aircraft by approximately 15 minutes per aircraft or 2) increase the overall throughput by approximately 8% 11% per year. This new operation has the potential to deliver even greater benefits if it were extended to include other runway configurations and demand conditions. The results suggest that a large throughput / delay benefit can be gained from a modest extension of the TSS tool that is already in the Federal Aviation Administration's planned new capabilities by 2020.

Published
2014

41. Model-Free Approach to DC Microgrid Optimal Operation under System Uncertainty Based on Reinforcement Learning

Author

Roni Irnawan, Ahmad Ataka Awwalur Rizqi, Muhammad Yasirroni, Lesnanto Multa Putranto, Husni Rois Ali, Eka Firmansyah, and Sarjiya

Subjects
DC microgrids, optimisation, Q-learning, Q-network, reinforcement learning, Technology
Abstract

There has been tremendous interest in the development of DC microgrid systems which consist of interconnected DC renewable energy sources. However, operating a DC microgrid system optimally by minimizing operational cost and ensures stability remains a problem when the system’s model is not available. In this paper, a novel model-free approach to perform operation control of DC microgrids based on reinforcement learning algorithms, specifically Q-learning and Q-network, has been proposed. This approach circumvents the need to know the accurate model of a DC grid by exploiting an interaction with the DC microgrids to learn the best policy, which leads to more optimal operation. The proposed approach has been compared with with mixed-integer quadratic programming (MIQP) as the baseline deterministic model that requires an accurate system model. The result shows that, in a system of three nodes, both Q-learning (74.2707) and Q-network (74.4254) are able to learn to make a control decision that is close to the MIQP (75.0489) solution. With the introduction of both model uncertainty and noisy sensor measurements, the Q-network performs better (72.3714) compared to MIQP (72.1596), whereas Q-learn fails to learn.

Published
2023
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47. Observation and Analysis of Departure Planning Operations at Boston Logan International Airport

Author

Idris, Husni R., Hansman, R. John, Idris, Husni R., and Hansman, R. John

Abstract

The Departure Planner (DP) is a concept for a decision-aiding tool that is aimed at improving the departure operations performance at major congested airports. In order to support the development of the DP tool, the flow constraints and their causalities in the departure process – primarily responsible for generating inefficiencies and delays- need to be identified. This thesis is and effort to identify such flow constraints and gain a deep understanding of the underlying dynamics of the departure process based on field observations and data analysis at Boston Logan International Airport. It was observed that the departure process is a complex interactive queuing system, where aircraft queues from as a manifestation of the flow constraints. While departure delays were observed in all airport components (runways, taxiways, ramps and gates), it was concluded that the flow constraints manifest mainly at he runway system, which exhibits the largest delays and queues…, National Aeronautics and Space Administration Ames Research Center

Published
2011

48. Trajectory planning by preserving flexibility : metrics and analysis

Author

Idris, Husni R. and Idris, Husni R.

Subjects
Trajectory optimization., Air traffic control., Distance measuring equipment (Aircraft to ground station), Optimisation des trajectoires., Circulation aérienne Contrôle., Distancemètres (Aéronautique), Air traffic control., Distance measuring equipment (Aircraft to ground station), Trajectory optimization.
Published
2008

50. A Conceptual Design of A Departure Planner Decision Aid

Author

Anagnostakis, Ioannis, Idris, Husni R., Clarke, John-Paul, Feron, Eric, Hansman, R. John, Odoni, Amedeo R., Hall, William D., Anagnostakis, Ioannis, Idris, Husni R., Clarke, John-Paul, Feron, Eric, Hansman, R. John, Odoni, Amedeo R., and Hall, William D.

Abstract

Terminal area Air Traffic Management handles both arriving and departing traffic. To date, research work on terminal area operations has focused primarily on the arrival flow and typically departures are taken into account only in an approximate (average) manner. However, arrivals and departures are highly coupled processes especially in the terminal airspace, with complex interactions and sharing of the same airport resources between arrivals and departures taking place in practically every important terminal area. Therefore, the addition of automation aids for departures, possibly in co-operation with existing arrival flow automation systems, could have a profound contribution in enhancing the overall efficiency of airport operations. This paper presents the conceptual system architecture for such an automation aid, the Departure Planner (DP). This architecture can be used as a core in the development of decision-aiding systems to assist air traffic controllers in improving the performance of departure operations and optimize runway time allocation among different operations at major congested airports. The design of such systems is expected to increase the overall efficiency of terminal area operations and yield benefits for all stakeholders involved in Air Traffic Management (ATM) operations, users as well as service providers., This research was supported in part by NASA, under grant NAG 2-1128. The

Published
2007

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