Name Lee, SangJoong
Position professor
Tel +82-2-970-6411
E-mail 85sjlee@seoultech.ac.kr
Biography
• Chungnam National University (Ph.D, Major: Electric Power System and Control)
Doctorial Dissertation : Voltage Collapse Proximity Indicator and Its Application to Power System
• Power System Engineering Course (PSEC), GE Research Center, Schenectady, NY. USA
• SungKyunKwan University, Seoul, Korea (Bachelor: Electrical Engineering)
• Lincoln University, CA, USA (MBA)
• Busan Technical College (5th Grade Graduation)
Careers
• Jun 1. 1998 - present :  Professor, Electrical Engineering Dept., SeoulTech
• 1976 – 1998 Korea Electric Power Corporation (KEPCO)
Manager of I&C, Commissioning Dept. Poryong Power Plant
Senior Researcher of Power System Research Division, Hydro/Thermal Power Research Division, KEPCO Research Institute(KEPRI)
• A Representative Player of Busan Technical College for International Vocational Training Competition 1974( R/TV Repair Division)
Research Areas
• Electric Power System Computation, Analysis
• Electric Power Generation
• Economics of Electric Power System
• Electrical Circuits, Controls
• Engineering Mathematics
• Climate Change and its Influence to Industry, CO2 Trading System
• Special Class preparing Professional Engineers Examination
Teaching
• Electric Power System
• Electric Power Generation
Selected Publications
► Seong-Deog Yang, Sang-Joong Lee, “Mathematical reconsideration of number of variables in power flow computation”, Electrical Engineering, 09 Jul 2016, DOI 10.1007/s00202-016-0383-4
► Sang-Joong Lee, N. Woo, C. Park, Electric Power Generation, Textbook of Soodo Meister School, ISBN-978-89-97561-05-6, Jan 27. 2012.
► Sang-Joong Lee, “Location of a Superconducting Device in a power grid for system loss minimization using loss sensitivity”, IEEE Transaction on Applied Superconductivity (ISSN 1051-8223), vol.17, no.2, Jun 2007, pp 2351-2354
► Seong-Deog Yang, Sang-Joong Lee, “A Remark on a mathematical formulation for system loss minimization using equal incremental loss sensitivities”, IEEE Transaction on Power Systems, vol.22, no.1, Feb 2007, pp 496-497
► Sang-Joong Lee, “Economic location of industrial fuel cell in a power system using cost sensitivity derived by normal power flow“ Journal of Power Source(ISSN 0378-7753), vol.157, Issue 2,3, Completing Volume 157, Jul 2006, pp. 828-831
► Sang-Joong Lee, Seong-Deog Yang "Derivation of P-Q Loss Sensitivities by Angle Reference Transposition and An Application to Optimal P-Q Generation for Cost Minimization ", IEEE Transactions on Power Systems,(ISSN 0885-8950) vol.21, no.1, Feb 2006, pp. 428-430
► Sang-Joong Lee, Seong-Deog Yang "Derivation of system loss sensitivity using optimization and application to improved ELD computation" International Journal of Electrical Power and Energy Systems, vol.26, no.6, Jul 2004, pp. 461-464
► Sang-Joong Lee, "Calculation of Optimal Generation for System Loss Minimization Using Loss Sensitivities Derived by Angle Reference Transposition", IEEE Transactions on Power Systems,(ISSN 0885-8950) vol.18, no.3, Aug 2003, pp. 1216-1217
► Sang-Joong Lee, Kern-Joong Kim, “Re-construction of Jacobian Matrix by Angle Reference Transposition and Application to New Penalty Factor Calculation”, IEEE Power Engineering Review,(ISSN 0272-1724) vol.22, no.2, Feb 2002, pp. 47-50

Journal Papers
- Derivation of loss sensitivities by angle reference transposition and its applications to power system computation, Transactions of the Korean Institute of Electrical Engineers, vol.69 No.6 pp.821~828, 2020
- An exact voltage-power equation with no angle terms for an AC two-bus system, Transactions of the Korean Institute of Electrical Engineers, vol.69 No.5 pp.637~643, 2020
- Shortest Connection of Transmission Lines with Intersection Angle  via Specific Point (p, q), Journal of the Korean Institute of Electrical Engineers, vol.68 No.11 pp.1440~1449, 2019
- Triangle ABC and Length of Fermat Tree, Journal of the Korean Institute of Electrical Installation Engineers, vol.68 No.10 pp.1169~1175, 2019
- Reduction of trip operating time of electronic type ELCB to 9 mili-seconds for safety improvement of electrical facility, IEICE Electronics Express, vol.16 No.19 pp.1~5, 2019
- Development of household socket-outlets(250V/20A) by improving material and structure of socket-contacts, Journal of KIIEE, vol.33 No.7 pp.27~33, 2019
- A Lecture Note for Introduction of Steiner (Fermat) Tree to Electrical Engineering Education - Comparison of Path Lengths of Minimum Spanning Tree and Steiner Tree, Journal of the Korean Institute of IIIuminating and Electrical Installation Engineers, vol.33 No.6 pp.9~18, 2019
Conference Papers
- 이상중, 김주철, Derivation of maximum power transfer condition for DC two-bus system using optimization, Proceedings of 2020 KIIEE Spring Conference, 강원 평창, 2020
- 김주철, 장기호, 윤민석, 이봉택, 김병선, 서문수, 이상중, Development of 4-point type household outlet with improved socket-contact structure and safety pin technology, 2019 KiiEE Spring Conference Proceedings, 평창, 2019
Books
► Sang-Joong Lee, N. Woo, C. Park, Electric Power Generation, Textbook of Soodo Meister School, ISBN-978-89-97561-05-6, Jan 27. 2012.
Patents
EMS RTU Function Enhancement. 1990
Projects
- 2모선 계통의 위상각 없는 전압-전력방정식, 산학협력단, 2019.09.~2020.08.
수상
- Path-weighted Ste¡ner point를 이용한 관리본부의 최적위치 선정, 우수논문, 전기학회, 2015
- 교내 우수교육상(2014), 교내 우수교육상(2014), 서울과학기술대학교, 2014
- 직각 배치된 세점의 두가지 최단거리 결선방법과 수학적 증명을 통한 길이 비교, 우수논문상, 대한전기학회, 2014
- 학술연구발전기여, 학술상, KIIEE, 2014
Miscellaneous
- Senior Member IEEE
- Senior Member KIEE