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이현섭(Hyunseob Lee),좌경룡(Kyung-Yong Chwa) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1A
가쉬핑이란 그래프에서 각각의 점들이 각각 다른 메시지들을 다른 모든 점들에게 전달하는 것이다. 이 논문에서는 그리드 구조에서 각각의 점들이 매번 인접한 하나의 점과 하나의 메시지를 서로 주고받을 수 있는 조건 하에서 가쉬핑을 빠르게 하는 알고리즘을 제시한다. m × n 그리드에서 가쉬핑을 하는 기존의 알고리즘은 (mn + ¼mn + 2) 라운드가 걸렸는데 이는 이 문제의 알려진 하한인 (mn + 1)과는 거리가 있었다. 우리는 mn이 홀수인 그리드 구조에서 가쉬핑을 (mn + 9) 라운드 만에 끝낼 수 있는 알고리즘을 제시한다.
고고도 모사용 초음속 Center Body Diffuser의 유동 및 열전달 특성에 대한 연구
이현섭(Lee Hyunseob),김준철(Kim Juncheol) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
A study has been conducted to elucidate the flow and heat transfer characteristics of Supersonic Center Body Diffuser for high altitude simulation. Flow characteristic of diffuser have been studied by changing configuration of (L/D)<SUB>st</SUB> and pressure. Heat transfer characteristic have been studied by adding cooling system. In the adiabatic analysis, there were high temperature region over 3500K without cooling, near the wall in subsonic diffuser part. So cooling system is required. By analyzing the relationship between P₀ and heat flux in supersonic diffuser part, Prediction of Heat transfer is possible.
이선영(Sunyoung Lee),이현섭(Hyunseob Lee),양희성(Heeseong Yang),길태옥(Taeock Khil),김동욱(Dongwook Kim),방제훈(Jaehoon Bang),최성호(Sungho Choi),이용선(Yongseon Lee) 한국추진공학회 2020 한국추진공학회지 Vol.24 No.6
In this paper, a subminiature solid rocket motor(SSRM) was designed to develop a miniature smart-bullet and the designed propellant grain was made of thermoplastic propellant for production convenience of inner shape. The internal ballistics analysis and ground test were performed to investigate the performance of SSRM. And a numerical simulation was carried out to obtain basic data on the design of safety distance between the nozzle outlet and a gunner, the temperature distribution of exhaust gas was analyzed by comparing a numerical simulation and the results of IR camera.
이선영,오종윤,이현섭,길태옥,김민호,Lee, Sunyoung,Oh, Jongyun,Lee, Hyunseob,Khil, Taeock,Kim, Minho 한국추진공학회 2022 한국추진공학회지 Vol.26 No.4
In this paper, the combustion characteristics of solid propellant embedded with metal wires were analyzed by the ground tests of motors. The propellant grains were made of thermoplastic propellants with Al and Cu as metal wires for the enhancement of burning area and designed with cone shape for better ignition. These metals were used to confirm the enhancement of burning rate on thermal diffusivity properties. The internal ballistics analysis and ground test were performed to investigate the effect of burning rate for each metal wire. We obtained the results of burning rate on a difference of thermal diffusivity of each metal wire with well-made propellant grains.