Categories - Energy Systems

Sub Categories

Topics

energy-system-model, pypsa, power-flow, optimal-power-flow, power-systems-analysis, nrel, capacity-expansion-planning, powersystem, power-system-analysis, microgrid, loadflow, adequacy, power-network, gym-environments, matpower, oemof, power-grids, cim, powersystems, electrical, power-system, milp, energy-management, demand-flexibility, rte, optimisation-model, load-flow, mathematical-modelling, osemosys, renewable-timeseries, potentials, modelling-framework, oep, energy-management-systems, clean-energy, powsybl, short-circuit, minigrid, smart-grid, co-simulation, previsionnel, sequential-decision-making-problems, times-model, bilan, efficiency, gymnasium, power-system-dynamics, tyndp, eia-api, smart-grids, integrated-resource-planning, hydro-cascade-basins, hourly-resolution, distribution-grid, network-constrained-unit-commitment, power-to-hydrogen, tight-and-compact-formulation, very-large-scale-systems, dynamic-line-rating, heat-pump, anaconda, miniconda, spine-toolbox, free-datasets, ev-charging, green-energy, myenergi, dygraphs, manipulatewidge, electric, distribution-shift, nyiso, newyork, kaggle-dataset, kaggle-competition, kaggle, clcpa, esdl, energy-transition-calculation, energy-information, description-language, tegola, maplibre-gl-js, imposm3, powergrid-operation, grid2op, klu, agent-based-simulation, linopy, industry-aplication, generation-storage-networks-investments, energy-storage-systems, dynamic-investment-decisions, dc-power-flow, costs, dispatch, urban-heat-island, openadr, lf-energy, reoptjl, reopt-lite-api, reopt-api, testbed, software-in-the-loop, standalone-software, renewable, flexibility, balancing, power-stations, transmission-grid, planning-tool, policy, simauto, pythran, powerworld-simulator, powerworld, graph-analysis, contingency-analysis, springframework, public-lighting, oslp, iec61850, dlms, distribution-automation, cucumber-tests, hardware-designs, emonpi, v2s, v2h, v2g, v2b, smart-charging, data visualization, time-series-aggregation, representative-days, k-medoids-clustering, k-means-clustering, hierarchical-clustering, energy transition, electricity market modelling, power market model, open source model, GAMS, high-resolution, virtual-sensors, metering, consumption, minlp, electricity-networks, active-network-management, transient-stability, simulator-automation-server, state-estimation, calliope-models, hypervision, alerting, energy-modelling, slimmemeter, slimme-meters, nifi-processors, nifi, dsmr-parser, dsmr, datamodel, pypsa-earth, pypsa-africa, power-system-planning, power-system-model, operational-optimization, investment-optimization, energy-system-planning, stochastic-simulation-algorithm, ev-integration, bidirectional-charging, power-system-stabilizer, power-system-stability, power-system-dynamic-modeling, power-grid, gridcal, iec61970, cim-import, cim-export, energy-flexibility, environmental, rhdf5, quasi-stationary, emt, electromagnetic-transient, dynamic-phasors, smart-home, octopus-energy, system, harmonics, graphical-user-interface, free-libre-open-source-software, free-and-open-source-software, computer-aided-design, solar-system, glpk, energy-models, earth-osm, glow, esphome, wma, sma, ses, rnn, lstm, gru, n-1-criterion, ignite-cli, grid-system, eolian, cosmos-sdk-proto, 3-phases, 3-phase-inverter, typical-periods, aggregation, rts, worldbank-gost, labor, gender, open-energy, oedi, datalake, user-defined-control, synchronous-machine, stability, psp-ufu, electricity-supply, economic-dispatch, dispatchable-units, dc-flow, time-of-use-tariff, electric-vehicle-charging-station, municipal-software, greenbutton, green-button, energy-usage, download-my-data, connect-my-data, transactive-energy, smartgrid, power-simulator, FAME, microgrid-model, pycaret, electric-load-forecasting, arima, times, optimization-model, integrated-markal-efom, bottom-up-model, energy-forecasting, solarnode, solarnetwork, plugin-architecture, osgi, mbus, loxone, energy-generation, canbus, water-energy-nexus, unit-commitment, substations, renewable-resources, agent-based, energy-optimization-model, bulma-css, decarbonisation, voltage-drop-analysis, short-circuit-analysis, pandapower, electrical-systems, electrical-system, electrical-schematics, electrical-rules-check, electrical-networks, electrical-network-analysis, coordination-study, nuclear, npps, modular, groovy, snakemake-workflow, stochastic-power-flow, newton-raphson, multi-terminal, latin-hypercube, comon-information-model, acdc, stateestimation, shortcircuit, eigen3, villas, energy-demand-forecasting, energy-demand, electricity-load, students, investment, energy-planners, mixed-integer-linear-programming, lovelace-card, gridlabd, sector-coupling, great-britain, electricity-consumption-forecasting, electricity-consumption-analysis, ireland, energy-planning, energy-systems-modelling, market, process-systems-engineering, modelling-tool, cgmes, energy-information-administration, nx, green-energy-hub, energy-origin, off-grid, monophased, islanding, extensible, marktstammdatenregister, flexibility-modeling, timedomain, small-signal, modeling-dae, eigenvalue-analysis, andes, power-supply, openmodelica, pudl, natural-gas, ferc, etl, eia923, eia860, ddj, cems, matpower-github,

Projects

Contributors

Hazem-IEG [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Global and Regional Energy System Models, Regional Energy System Models
Topics: energy-system-model, energy-system-planning, investment-optimization, operational-optimization, power-system-model, power-system-planning, pypsa-africa, pypsa-earth, scenario-analysis

SmartJingJing123 [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Analysis and Planning
Topics: contingency-analysis, esa, graph-analysis, power-flow, powersystem, powerworld, powerworld-simulator, pythran, simauto, simulator and 3 more

Collin Heist [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Grid Analysis and Planning
Topics: contingency-analysis, esa, graph-analysis, power-flow, powersystem, powerworld, powerworld-simulator, pythran, simauto, simulator and 3 more

jinningwang [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: curent, large-scale, messaging, power-grids, power-system, power-system-analysis, simulation-framework, best-of, best-of-list, co-simulation and 19 more

Abhishek Shivakumar [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models
Topics: energy-model, osemosys

Abhishek Shivakumar [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models
Topics: energy-model, osemosys

Taco Niet [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models
Topics: energy-model, osemosys

kkuling [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models
Topics: energy-model, osemosys

Henry Choi [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models, Regional Energy System Models
Topics: energy-system-model, energy-system-planning, investment-optimization, operational-optimization, power-system-model, power-system-planning, pypsa-africa, pypsa-earth, scenario-analysis

RasmusBramstoft [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics: energy-system-model, gams, optimisation-model

fraukewiese [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics: energy-system-model, gams, optimisation-model

Juan Gea Bermudez [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics: energy-system-model, gams, optimisation-model

Martijn Backer [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics: energy-system-model, gams, optimisation-model

amanmajid [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models
Topics: energy-model, osemosys

Abhishek Shivakumar [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models
Topics: energy-model, osemosys

Shourya Jain [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models
Topics: azure-machine-learning, azureml, energy-model, osemosys

trevorb1 trevor@Trevor

OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models
Topics: energy-model, osemosys

[email protected] [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Edgar Ubaldo Pena Sanchez [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Julian Belina-Admin [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

[email protected] [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Grid Analysis and Planning
Topics:

Sam West [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: data-processing, energy-systems-modelling, open-science, times-model

Olexandr Balyk [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: energy-system-model, gams, integrated-markal-efom, optimisation-model, data-processing, energy-systems-modelling, open-science, times-model

MoritzSchloesser [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Grid Analysis and Planning
Topics:

tiernan-buckley-ufr [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Markets
Topics:

Lukas Schirren [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics: csp, dynamic-line-rating, energy-system, energy-systems, era5, heat-pump, potentials, pv, reanalysis, renewable-energy and 3 more

FLabG [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: dc-power-flow, dynamic-investment-decisions, energy-storage-systems, generation-storage-networks-investments, hourly-resolution, hydro-cascade-basins, network-constrained-unit-commitment, power-to-hydrogen, tight-and-compact-formulation, very-large-scale-systems and 1 more

Clara Ivanescu [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Data Accessibility and Integration
Topics: gender, labor, worldbank, worldbank-gost

frey_ul [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy Policy
Topics: agent-based-modeling, electricity market modelling, energy transition

frey_ul [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy Policy
Topics: agent-based-modeling, electricity market modelling, energy transition

ljansen [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models
Topics: energy-system-model, energy-system-planning, investment-optimization, operational-optimization, power-system-model, power-system-planning, pypsa-africa, pypsa-earth, scenario-analysis

cphili [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: cim, energy-system, extensible, groovy, modular, power-system-simulation, power-systems, powsybl

Klaus Jaroslawsky [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Data Accessibility and Integration
Topics: charging-stations, eebus, electric-vehicles, emobility, energy-management, energy-management-systems

Cord Kaldemeyer [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: energy-system, modelling-framework

Xinhe Chen [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics: chemical-engineering, process-modeling, process-systems-engineering, idaesplus

Kyle Skolfield [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics: chemical-engineering, process-modeling, process-systems-engineering, idaesplus

Andrew Lee [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics: chemical-engineering, process-modeling, process-systems-engineering, idaesplus

Jordan Jalving [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics: chemical-engineering, process-modeling, process-systems-engineering, gradient-boosted-trees, keras-neural-networks, mathematical-modelling, mathematical-programming, mixed-integer-optimization, mixed-integer-programming, modeling-language and 6 more

Chrispine Tinega [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: capacity-expansion-planning, clean-energy, climate-change, electrical-engineering, energy-system, energy-systems, linopy, loadflow, optimal-power-flow, optimisation and 7 more

Bao Mai [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: climate-change, environmental, plotly

Ella Summerhill [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: climate-change, environmental, plotly

vyvyvyThao [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: climate-change, environmental, plotly

lezneew [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: loadflow, power, powerflow, short-circuit, state-estimation, system

Supelana [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Grid Management and Microgrid
Topics: energy-origin, green-energy-hub, nx

Cosmin G Petra [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Grid Analysis and Planning
Topics: acopf, bfgs, constrained-optimization, gpu-support, interior-point-method, interior-point-optimizer, math-physics, mpi, nonlinear-optimization, nonlinear-programming and 12 more

Alex Blanco [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Grid Analysis and Planning
Topics: acdc, cim, comon-information-model, electrical, electrical-engineering, latin-hypercube, multi-terminal, newton-raphson, power-systems, powerflow and 1 more

Andre [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: climate-change, environmental, plotly

theREALNguyenAnh [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: climate-change, environmental, plotly

Stephen M [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: climate-change, environmental, plotly

Viet Nguyen [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: climate-change, environmental, plotly

nielskool [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: model-predictive-control

Solene Bard [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

mircopesent [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Solene Bard [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

ArthurWaeber [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Darynarli [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: oep, open-energy-family

astronobri [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:

selenasat [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: climate-change, environmental, plotly

KySuongLam [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: climate-change, environmental, plotly

Franck Nijhof [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: varta, varta-storage, asyncio, water, asynchronous, recycling, trash, twentemilieu, waste, do-not-use and 28 more

Philipp Reuber [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Data Accessibility and Integration
Topics: cim, cim-export, cim-import, iec61970

Jonathan Klimt [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Data Accessibility and Integration
Topics: cim, cim-export, cim-import, iec61970, cloud-computing, operating-system, operating-systems, osdev, unikernel, virtualization and 2 more

Jonathan Klimt [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Data Accessibility and Integration
Topics: cim, cim-export, cim-import, iec61970, cloud-computing, operating-system, operating-systems, osdev, unikernel, virtualization and 2 more

gmkeebiy [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Grid Analysis and Planning
Topics: imposm3, maplibre-gl-js, tegola

sstroemer [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: energy-system-model

Stefan Strömer [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: energy-system-model

Daniel Schwabeneder [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: energy-system-model

Gerhard Totschnig [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: energy-system-model

Shengy [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Data Accessibility and Integration
Topics:

J-K-Peng [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: andes, eigenvalue-analysis, modeling-dae, power-system, power-system-analysis, power-system-dynamics, power-system-simulation, powerflow, small-signal, timedomain and 1 more

Christian Heinrich Hohlfeld [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:

Torio [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Diana Maldonado [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Keno Oltmanns [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Meike Kühnel [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Maldonado Castro, Diana Teresa [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Hancock, Cody [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

gaik_na [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

von Rüden [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Wilson González Vanegas [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: matpower, matpower-github

polyfloyd [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: glsl, glslviewer, raytracing, shadertoy, fritz-box, fritzbox, lua, upnp, model-predictive-control

Luke Kiernan [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: powersystems, simulations

viktoria.Illyes [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: energy-system-model

paulapreuss [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: energy-system, modelling-framework

Marlon Fleck [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: oemof, capacity-expansion-planning, clean-energy, climate-change, electrical-engineering, energy-system, energy-systems, linopy, loadflow, optimal-power-flow and 8 more

Reedy [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: emoncms, symfony, symfony-component, contract, service, symfony-contract, dotenv, abstractions, contracts, decoupling and 20 more

Arthur Chan [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: fuzz-testing, fuzzing, oss-fuzz, stability, vulnerabilities, cloud-computing, compliance, gcp, lambda, rules-engine and 9 more

Ray Kinsella [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: emoncms, openenergymonitor, sustainability

Valery De Smedt [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: node-serialport, nodebots, robot, serial, serial-ports, serialport, emoncms, openenergymonitor, sustainability

Pydrex [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: ev-charging, green-energy, myenergi

mdb17 [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics: consumption, hacs, metering, power, virtual-sensors

lschmeling [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Patrik Schönfeldt [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Patrik Schönfeldt [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Turhan [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Patrik Schönfeldt [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Fernando Penaherrera [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

Martin Krisch [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:

KelvinZhang99 [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics: hydropower, renewable-energy, reservoir-modeling

José Ignacio Zapata Fuentealba [email protected]

OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Markets, Energy Modeling and Optimization
Topics: mathematical-programming, modeling-language, nonlinear-programming