Latest Space News
Mon, 19 Mar 2018 17:49:42 +0000
For the space-based infrared SBIRS satellites 5 and 6, the Air Force says the per-unit cost went down 12 percent — from $1.9 billion to $1.6 billion.
Mon, 19 Mar 2018 10:39:02 +0000
Companies that are developing small launch vehicles or who provide rideshare launch services say they expect new Chinese launch vehicles to drive down launch prices, raising concerns among some of unfair competition.
Sun, 18 Mar 2018 09:26:31 +0000
Pentagon official: “There are new threats that the industrial base needs to support. So what does this mean in terms of production capacity?”
Fri, 16 Mar 2018 20:56:55 +0000
Loral Space and Communications wants to move ahead with a “strategic transaction” involving fleet operator Telesat that may spark a legal fight with Telesat’s other major shareholder, a Canadian pension fund.
Fri, 16 Mar 2018 16:49:52 +0000
To prevent collisions in space, nations with advanced orbital monitoring abilities need to share data with each other. Russia, being skilled in space situational awareness (SSA), should be part of the global effort to protect the space environment, experts said March 15 at the Satellite 2018 conference here.
Fri, 16 Mar 2018 13:48:13 +0000
In its budget proposal for the coming year, the U.S. Air Force is trying to send the same message to foreign adversaries and critics at home: the service definitely is not underestimating threats the United States and its allies face in space.
Thu, 15 Mar 2018 23:57:04 +0000
Assistant Secretary of Defense Kenneth Rapuano: “The president is very interested in ensuring that the department is best organized and equipped to achieve our vital missions in space."
Thu, 15 Mar 2018 20:17:02 +0000
The hand-wringing continues at the Pentagon over how to respond to Chinese and Russian missile advances.
Thu, 15 Mar 2018 17:18:23 +0000
With a stopgap spending bill set to expire in just over a week, House and Senate appropriators are continuing to negotiate provisions of an omnibus bill, including funding levels for some NASA programs.
Thu, 15 Mar 2018 15:22:31 +0000
Broadband megaconstellations are expensive propositions, with SpaceX’s Starlink constellation expected to cost $10 billion or more, and OneWeb expecting to spend $3 billion. The actual cost could ultimately be higher.
Thu, 15 Mar 2018 12:52:06 +0000
The introduction of 5G services will bring users globally the ability to have true anytime, anywhere capabilities to support a myriad of user devices and applications never imagined.
Thu, 15 Mar 2018 11:17:36 +0000
The U.S. Senate confirmed Jeffrey DeWit as NASA's new chief financial officer March 14, completing an expedited process starkly different than the one for the agency's next leader.
Thu, 15 Mar 2018 03:13:13 +0000
United Launch Alliance plans to increase its activities in the commercial launch market using both the current Atlas and future Vulcan rockets, while acknowledging that the U.S. government will remain its major customer for the foreseeable future.
Thu, 15 Mar 2018 02:39:35 +0000
Satellite manufacturers say they are trying to protect their component suppliers from the drought of commercial telecom spacecraft that threatens to put such companies out of business.
Wed, 14 Mar 2018 23:34:12 +0000
House Armed Services Committee Chairman Mac Thornberry: "We will not relax our effort on space reforms. This topic is just too important.”
Wed, 14 Mar 2018 23:24:56 +0000
WASHINGTON — The Air Force on Wednesday awarded two major launch contracts to SpaceX and United Launch Alliance. Under the Evolved Expendable Launch Vehicle (EELV) program, SpaceX received a $290 million firm-fixed-price contract for three GPS 3 missions. ULA was awarded a $351 million firm-fixed-price deal for Air Force Space Command (AFSPC)-8 and AFSPC-12 satellites […]
Wed, 14 Mar 2018 17:32:25 +0000
Despite uncertainty about who will lead the agency after the end of April, NASA's current acting administrator says he expects little change in the agency's activities in the near future.
Wed, 14 Mar 2018 17:14:02 +0000
The downward trend of satellite capacity pricing, brought about largely by the increase in more powerful high-throughput satellites, has prices trending between 35 and 60 percent lower than where they were two years ago, according to Northern Sky Research.
Wed, 14 Mar 2018 15:06:37 +0000
“We can put a satellite phone in the hands of folks who don’t know how to use it and it won’t make a hill of beans difference,” said Ken Flowers, Iridium Communications vice president government.
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    Candidate Profile
     Date Submitted:20-03-2014
     Last Modified:26-03-2014 (02:49)
    Job information
     Current job:Senior Research Engineer
     Employment Term:Permanent
     Job location:Anywhere
     Date available:within 2 months
     KeywordsAstrodynamics, Optimal Control, Trajectory Optimization, Nonlinear Dynamical Systems, Vibrations

    University of Southern California – Los Angeles, CA 90089-1453, USA
    ▪ Ph.D. in Aerospace Engineering (December 2012)
    ◦ Supervisor: Prof. Firdaus E. Udwadia
    ◦ Dissertation: New Approaches to Satellite Formation-Keeping and the Inverse Problem of the Calculus of Variations
    Yonsei University – Seoul 120-749, Republic of Korea
    ▪ M.S. in Astronomy  and Space Science (February 2008)
    ◦ Supervisor: Prof. Sang -Young Park
    ◦ Thesis: Analytic Solutions to Fuel-Optimal Reconfiguration of Satellite Formation Flying
    ▪ B.S. in Astronomy and Space Science (major) and Physics (minor) (February  2006)

    Samsung Techwin Co., Ltd., Power Systems Division,  Control Group           (March 2013 – )
    –  Gyeonggi-do 463-400, Republic of Korea
    ▪  Works  as  a  senior  research  engineer.  Develops  control  algorithms  for  propulsion  control  and monitoring systems of MUAVs (Medium-altitude Unmanned Aerial Vehicles) together with Korean  Agency  for  Defense  Development.  Main  work  includes  1)  analysis  of  the  control  requirements,  2)  design  of  controllers  using  Matlab/Simulink,  and  3)  verification  of  the designed controllers via software testing and HILS (Hardware-In-the-Loop Simulations).

    ▪  Udwadia, F. E., Wanichanon, T., and  Cho, H., “Methodology for Satellite Formation-Keeping in the  Presence  of  System  Uncertainties,”  Journal  of  Guidance,  Control,  and  Dynamics.
    (Accepted for publication)
    ▪  Udwadia,  F.  E.  and  Cho,  H.,  “First  Integrals  and  Solutions  of  Duffing-Van  der  Pol  Type Equations,” Journal of Applied Mechanics, Vol. 81, No. 3, 2014, pp. 034501-1 – 034501-4.
    DOI: 10.1115/1.4024673
    ▪  Cho,  H.  and  Udwadia,  F.  E. ,  “Explicit  Control  Force  and  Torque  Determination  for  Satellite Formation-Keeping  with  Attitude  Requirements,”  Journal  of  Guidance,  Control,  and Dynamics, Vol. 36, No.2, 2013, pp. 589-605.
    DOI: 10.2514/1.55873
    ▪  Udwadia,  F.  E.  and  Cho,  H.,  “Lagrangians  for  Damped  Linear  Multi-Degree-of-Freedom Systems,” Journal of Applied Mechanics, Vol. 80, No.4, 2013, pp. 041023-1 – 041023-10.
    DOI: 10.1115/1.4023019
    ▪  Cho, H., Park, S. –Y., Yoo, S. –M., and Choi, K. –H., “Analytical Solution to Optimal Relocation of  Satellite  Formation  Flying  in  Arbitrary  Elliptic  Orbits,”  Aerospace  Science  and Technology, Vol. 25, No.1, 2013, pp. 161-176.
    DOI: 10.1016/j.ast.2012.01.005
    ▪  Cho,  H.,  Park,  S.  –Y.,  Park,  H.  –E,  and  Choi,  K.  –H.,  “Analytic  Solution  to  Optimal Reconfigurations  of  Satellite  Formation  Flying  in  Circular  Orbit  under  J2  Perturbation,” IEEE Transactions on Aerospace and Electronic Systems, Vol. 48, No. 3, 2012, pp.  2180-2197.
    DOI: 10.1109/TAES.2012.6237587
    ▪  Udwadia,  F. E.,  Leitmann,  G.,  and  Cho,  H.,  “Some  Further  Remarks  on  Hamilton’s  Principle,” Journal of Applied Mechanics, Vol. 78, No. 1, 2011, pp. 011014-1 – 011014-4.
    DOI: 10.1115/1.4002435
    ▪  Cho,  H.  and  Udwadia,  F.  E.,  “Explicit  Solution  to  the  Full  Nonlinear  Problem  for  Satellite Formation-Keeping,” Acta Astronautica, Vol. 67, No. 3-4, 2010, pp. 369-387.
    DOI: 10.1016/j.actaastro.2010.02.010
    ▪  Cho, H.  and Yu, A., “New Approach to Satellite Formation-Keeping: Exact Solution to the Full Nonlinear Problem,” Journal of Aerospace Engineering, Vol. 22, No. 4, 2009, pp. 445-455.
    DOI: 10.1061/(ASCE)AS.1943-5525.0000013
    ▪  Cho, H.  –C.  and  Park, S.  –Y.,  “Analytic Solution for Fuel-Optimal Reconfiguration in Relative Motion,”  Journal of Optimization Theory and Applications, Vol. 141, No. 3, 2009, pp. 495-512.
    DOI: 10.1007/s10957-008-9482-3
    ▪  Cho, H., Park, S.  –Y., and Choi, K. –H., “Application of Analytic Solution in Relative Motion to Spacecraft Formation Flying in Elliptic Orbit,”  Journal of Astronomy and Space Sciences, Vol. 25, No. 3, 2008, pp. 255-266.
    DOI: 10.5140/JASS.2008.25.3.255

    ▪  Cho,  H.,  and  Udwadia,  F.  E.,  (ASME  2012  International  Mechanical  Engineering  Congress  & Exposition,  IMECE  2012,  Houston,  Texas,  November  2012)  Inverse  Problem  for Lagrangian Dynamics for Multi-Degree-of-Freedom Systems with Linear Damping.
    ▪  Udwadia,  F.  E.,  and  Cho,  H.  (The  13 th ASCE  Earth  and  Space  2012  Conference,  Pasadena, California, April 2012) New Solutions to the Exact Formation-keeping Control of Satellites with Attitude Constraints.
    ▪  Cho,  H.,  and  Udwadia,  F.  E.,  (AIAA  SPACE  2011  Conference  &  Exposition,  Long  Beach, California,  September  2011)  New  Approach  to  Formation-Keeping  Problem  of  Multiple Satellites with Attitude Requirements.
    ▪  Wanichanon,  T.,  Cho,  H.,  and  Udwadia,  F.  E., (AIAA  SPACE  2011  Conference  &  Exposition, Long  Beach,  California,  September  2011)  Satellite  Formation-Keeping  Using  the Fundamental Equation in the Presence of Uncertainties in the System.
    ▪  Cho,  H.,  and  Udwadia,  F.  E.,  (Engineering  Mechanics  Institute  (EMI)  2010  Conference,  Los Angeles,  California,  August  2010)  Explicit  Solution  to  Satellite  Formation-Keeping Problem with Attitude Constraints.
    ▪  Cho,  H.,  and  Park,  S.  –Y.,  (The  16th Mediterranean  Conference  on  Control  and  Automation, Corsica,  France,  June  2008)  Simple  Analytic  Solution  to  the  Optimal  Reconfigurations  in General Relative Motions.
    ▪  Cho, H.,  Park,  S.  –Y.,  and  Choi,  K.  –H.,  (The  Annual  Spring  Conference  of  the  Korean  Space Science  Society,  Cheongju,  Rep.  of  Korea,  April  2008)  Simple  Analytic  Solutions  for Optimal Reconfigurations in General Relative Motion.
    ▪  Cho,  H.,  Park,  S.  –Y.,  and  Choi,  K.  –H.,  (The  Annual  Fall  Conference  of  the  Korean  Space Science  Society,  Daegu,  Rep.  of  Korea,  October  2007)  An  Analytic  Solution  to  FuelOptimal  Reconfiguration  of  Satellite  Formation  Flying  in  the  Presence  of  J2  Geopotential Disturbance.
    ▪  Cho, H. –C., Yoo, S. –M., Park, S. –Y., and Choi, K. –H., (The Annual Spring Conference of the Korean  Space  Science  Society,  Busan,  Rep.  of  Korea,  April  2007)  Applications  of Analytical Solutions into Reorienting, Resizing, and Retargeting of Formation Flying.
    ▪  Yoo, S. –M., Cho, H. –C., Park, S. –Y., and Choi, K. –H., (The Annual Spring Conference of the Korean Space Science Society, Busan, Rep. of Korea, April 2007) Numerical Validation of Analytical  Solution to  Optimal  Reconfiguration  of  Satellite  Formation  Flying  in  Arbitrary Elliptical Orbits.
    ▪  Cho,  H.  –C.,  Park,  S.  –Y.,  Yoo,  S.  –M.,  and  Choi,  K.  –H.,  (The  17th AAS/AIAA  Space  Flight Mechanics Meeting, Sedona, AZ, January 2007) Analytical Solution to Optimal Relocation of Satellite Formation Flying in  Arbitrary Elliptical Orbits.

    ▪  Cho,  H.,  and  Udwadia,  F.  E.,  (The  12th ASCE  Earth  and  Space  2010  Conference,  Honolulu, Hawaii,  March  2010)  Explicit  Analytic  Solution  to  the  Satellite  Formation-Keeping Problem.

    Matlab/Simulink, C/C++, Fortran, LabVIEW, Maple, Mathematica, SolidWorks, Solid Edge, PLC

    ▪ Brain Korea 21 Fellowship, Korean Science and Engineering Foundation, 2006  – 2008
    ▪ National Research Lab Fellowship, Korean Science and Engineering Foundation, 2006 – 2008
    ▪ Academic Excellence Scholarship, Yonsei University, 2005
    ▪ Academic Excellence Scholarship, Yonsei University, 2004

    ▪ Journal of Aerospace Engineering (8 papers)
    ▪ Applied Mathematics and Computation (5 papers)
    ▪ Journal of Optimization Theory and Applications (2 papers)
    ▪ ASME Applied Mechanics Reviews (1 paper)
    ▪ Journal of Sound and Vibration (1 paper)

    Astrodynamics,  Optimal  Control,  Trajectory  Optimization,  Satellite  Formation  Flying,  Nonlinear Dynamical Systems, Multi-body Dynamics and Control, Linear, Nonlinear, and Random Vibrations, Numerical Integration of Ordinary/Partial Differential Equations

    ▪  Teaching Assistant  for the junior-level  Computer-Aided  Analyses  for Aero-Mechanical Design.
    (Instructor:  Dr.  Yann  Staelens):  Duties  included  grading ,  hands-on  training  of  SolidWorks  and Solid Edge, and holding office hours                                
    (Spring 2011, Spring 2012)
    ▪ Teaching Assistant  for the junior-level Dynamics. (Instructor: Prof. Roger G. Ghanem, Dr. David C. Wilcox): Duties included lectures and holding office hours
    (Spring 2010, Fall 2010, Fall 2011)
    ▪  Teaching  Assistant  for  the  graduate-level  Linear  Control  Systems  II.  (Instructor:  Prof.  Henryk Flashner): Duties included grading, lectures, and holding office hours                      
    (Fall 2009, Fall 2010)
    ▪  Teaching  Assistant  for  the  graduate-level  Engineering  Analytical  Methods.  (Instructor:  Prof. Satwindar S. Sadhal): Duties included grading and holding office hours            
    (Spring 2010)
    ▪  Teaching  Assistant  for  the  graduate-level  Engineering  Analysis.  (Instructor:  Prof.  Charlie Campbell): Duties included grading and holding office hours                       
    (Fall 2009)
    ▪ Teaching Assistant  for the senior-level  Control Systems Laboratory. (Instructor: Dr. Jerry Chen): Duties included grading and holding office hours                                
    (Spring 2009)
    ▪  Teaching  Assistant  for  the  senior-level  Space  Flight  Dynamics.  (Instructor:  Prof.  Sang-Young Park) Duties included grading, lectures, and hands-on training of STK (Satellite Tool Kit®)
    (Spring 2006)

    University of Southern California, Los Angeles, CA 90089-1453
    ▪  New  methodology  for  satellite  formation-keeping  with  attitude  requirements  in  the  presence  of system uncertainties                                          (August 2008 – May 2012)
    The  purpose  of  this  research  is  to  analytically  develop  exact  formation-keeping  guidance schemes  that  determine  control  inputs  and  state  trajectories  in  the  presence  of  both  orbital  and attitude requirements. The obtained solution is new in that 1) it is assumed that the leader satellite’s reference  orbit  can  be  any  arbitrary  one  and  the  follower  satellites  are  required  to  point  to  an arbitrarily  chosen  specific  spot  in  space  that  may  be  time-varying,  2)  a  method  to  correct  initialcondition  misalignment  problems  due  to  sensor  measurement  noise  is  developed  so  that  both  the orbital  and  attitude  control  requirements  are  asymptotically  satisfied  at  any  desired  rate  of convergence,  and  3)  the  effect  of  model  uncertainties  is  also  considered  by  augmenting  an additional additive controller  based on a generalization of the notion  of sliding surface control.  It should  be  stressed  that  nonlinear  relative  dynamics  is  considered  in  its  entirety  without  any linearizations/approximations  and  the  solution  is  obtained  in  an  explicit  form,  which  shows  the possibility of precisely controlling nonlinear multi-body systems.
    ▪ New approaches to the inverse problem of the calculus of variations                                         (August 2010 – December 2012)
    To develop the equations of motion for a mechanical system, it is usual to define a Lagrangian function first and then obtain the equations of motion by applying the Lagrange equation when the forces are derivable from  a potential function. However, it is interesting  and useful  to  investigate the types of forces that can be engendered when substituting the forces into the Lagrange equation guarantees the proper equations of motion even when the forces do not arise from a potential, that is,  when  they  are  nonconservative.  In  this  inverse  problem   of  the  calculus  of  variations,  by extending  the  existing  Bolza’s  approach,  a  more  general  and  systematic  way  of  handling  the problem  is  found  for  single-degree-of-freedom  (SDOF)  systems.  Then,  new  results  for  linearly damped  multi-degree-of-freedom  (MDOF)  systems  are  obtained  using  extensions  of  results  for SDOF  systems.  Conservation  laws  for  these  damped  MDOF  systems  are  also  found  using  the Lagrangians  obtained,  and  the  first  integrals  and  the  analytical  solutions  of  some  nonlinear oscillators (ex. Duffing-van der Pol oscillator) are newly proposed. These new findings can be used for development of  approximate solutions of nonlinear differential equations or various numerical techniques.
    Yonsei University, Seoul 120-749, Republic of Korea
    ▪ Analytical analysis of fuel-optimal reconfiguration of formation flying   (Sponsor: Korean Science and Engineering Foundation)                        (March 2006 – July 2008)
    The problem of relative motion, formation flying, and rendezvous has been studied.  The  most significant advantage of the research has been the development of completely analytical  results, by use  of  the  Fourier  series  and  the  Pontryagin’s  minimum  principle.  The  major  contributions  have been  the  solutions  to  the  fuel-optimal  rendezvous  problem  for  satellite.  The  results  are  also  valid when the orbits of the satellites are non-circular with arbitrary eccentricity. The  J2-perturbed case has been  also considered.  These findings allow  us to  predict the form  of the optimal solutions in advance  without having  to  solve  the  problem  and  significantly  reduce  the  amount  of  calculations required.

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