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개수로 흐름에서 난류가 관성입자의 침강속도에 미치는 영향에 대한 실험연구
백승준,박용성,정성현,서일원,정원,Baek, Seungjun,Park, Yong Sung,Jung, Sung Hyun,Seo, Il Won,Jeong, Won 한국수자원학회 2022 한국수자원학회논문집 Vol.55 No.11
Existing particle tracking models predict vertical displacement of particles based on the terminal settling velocity in the stagnant water. However, experimental results of the present study confirmed that the settling velocity of particles is influenced by the turbulence effects in turbulent flow, consistent with the previous studies. The settling velocity of particles and turbulent characteristics were measured by using PTV and PIV methods, respectively, in order to establish relationship between the particle settling velocity and the ambient turbulence. It was observed that the settling velocity increase rate starts to grow when the particle diameter is of the same order as Kolmogorov length scale. Compared with the previous studies, the present study shows that the graphs of the settling velocity increase rate according to the Stokes number have concave shapes for each particle density. In conclusion, since the settling velocity in the natural flow is faster than in the stagnant water, the existing particle tracking model may estimate a relatively long time for particles to reach the river bed. Therefore, the results of the present study can help improve the performance of particle tracking models.
백승준,허찬영,오갑성,Baek, Seong-Jun,Heo, Chan-Yeong,Oh, Kap-Sung 대한미세수술학회 1999 Archives of reconstructive microsurgery Vol.8 No.2
The lower extremity injuries are extremely increasing with the development of industrial & transportational technology. For the lower extremity injuries that result from high-energy forces, particularly those in which soft tissue and large segments of bone have been destroyed and there is some degree of vascular compromise, the problems in reconstruction are major and more complex. In such cases local muscle coverage is probably unsuccessful, because adjacent muscles are destroyed much more than one can initially expect. Reconstruction of the lower extremity has been planned by dividing the lower leg into three parts traditionally The flaps available in each of the three parts are gastrocnemius flap for proximal one third, soleus flap for middle one third and free flap transfer for lower one third. Microvascular surgery can provide the necessary soft tissue coverage from the remote donnor area by free flap transfer into the defect. Correct selection of the appropriate recipient vessels is difficult and remains the most important factor in successful free flap transfer. Vascular anastomosis to recipient vessels distal to the zone of injury has been advocated and retrograde flow flaps are well established in island flaps. Retrograde flow anastomosis could not interrupt the major blood vessels which were essential for survival of the distal limb, the compromise of fracture or wound healing might be prevented. During 5 years, from March 1993 to Feb. 1998, we have done 68 free flap transfers in 61 patients to reconstruct the lower extremity. From analysis of the cases, we concluded that for the reconstruction of the lower extremity, free flap transfer yields a more esthetic and functional results.
백승준,김영태,김용환,Baek, Seung-Jun,Kim, Yeong-Tae,Kim, Yong-Hwan 한국전자통신연구원 1990 전자통신동향분석 Vol.5 No.3
통신신호가 통신회선을 통하여 전파될 때, 선로에 불평형이 나타나는 경우 가입자 선로와 대지간에 유도전류가 발생하여 대지로 흘러가게 되며 통신망의 성능에 영향을 미치게 된다. 본고에서는 통신회선의 불평형정도를 나타내는 평행도에 관하여 그 개념을 기술하고 각국에서 제시된 기준을 비교.분석한다.
백승준(Seungjun Baek),전용진(Yongjin Jeon),김한기(Hangi Kim),김종성(Jongsung Kim) 한국정보보호학회 2020 情報保護學會誌 Vol.30 No.3
최근 사물인터넷 환경이 발달하면서 센서 네트워크, 헬스케어, 분산 제어 시스템, 가상 물리 시스템 등의 다양한 분야의 산업이 부상하고 있다. 이를 위한 소형 컴퓨팅 기기가 보편화되고 있지만, 해당 기기들은 제한된 리소스라는 공통의 약점을 가지고 있다. 제한된 환경에서 중요한 데이터들을 보호하기 위해서는 많은 리소스가 필요한 기존의 암호 알고리즘보다 적은 리소스로도 운용할 수 있는 경량암호 알고리즘이 필요하다. NIST에서는 2015년부터 제한된 환경에 적합한 경량암호 알고리즘을 표준화하기 위한 공모사업을 진행 중이다. 현재 2라운드 과정을 거치고 있으며 총 32종의 알고리즘에 대한 안전성, 효율성 분석이 이루어지고 있다. 이에 본 논문에서는 NIST 경량암호 공모사업 1, 2라운드 후보 알고리즘들을 특징별로 분석하고, 몇 가지 알고리즘들을 심층적으로 살펴본다. 또한 향후 전망과 계속 진행될 공모사업의 타임라인을 제시한다.
무인 쿼드로터 로봇 횡 방향 제어를 위한 Fuzzy-PI 제어기 설계
백승준(Seung-jun Baek),이덕진(Deok-jin Lee),박종호(Jong-ho Park),정길도(Kil-To Chong) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.2
Quadrotor UAV (Unmanned Aerial Vehicle) is a flying robotic platform which has drawn lots of attention in the recent years. The attraction comes from the fact that it is able to perform agile VTOL (Vertical Take-Off Landing) and hovering functions. In addition, the efficient modular structure composed of four electric rotors makes its design easier compared to other single-rotor type helicopters. In many cases, a quadrotor often utilizes vision systems in order to obtain altitude control and navigation solution in hostile environments where GPS receivers are not working or deniable. For carrying out their successful missions, it is essential for flight control systems to have fast and stable control responses of heading angle outputs. This paper presents a Fuzzy Logic based lateral PI controller to stabilize and control the quadrotor vehicle equipped with vision systems. The advantage of using the fuzzy based PI controller lies in the fact that it could acquire a desired output response of a heading angle ven in presence of disturbances and uncertainties. The performance comparison of the newly proposed Fuzzy-PI controller and the conventional PI controller was carried out with various simulation results.
PVK:Ir(ppy)₃ 발광부를 갖는 고분자 인광 발광다이오드의 특성평가
백승준(Baek, Seung-Jun),공수철(Gong Su-cheol),이호섭(Lee, Ho-Sub),장성규(Jang, Seong-Kyu),장호정(Chang Ho Jung) 한국산학기술학회 2010 한국산학기술학회 학술대회 Vol.- No.-
고분자 발광다이오드(polymer light emitting diode, PLED)는 초박막화, 초경량화가 가능하며 간단한 용액공정 으로 향후 휨성(flexible) 디스플레이로의 응용이 가능할 것으로 기대되고 있다. 본 연구에서는 녹색 고분자 유기 발광다이오드를 제작하고, 효율을 향상 시키고자 이중 발광층을 두어 전기·광학적 특성을 평가하였다. ITO/Glass기판 위에 정공주입층으로 PEDOT:PSS [poly(3,4-ethylenedioxythiophene):poly(styrene sulfolnate)]를 발광물질로는 형광 발광물질인 PVK(poly-vinylcarbazole)와 인광 발광 물질인 Ir(ppy)3[tris(2-phenylpyridine) iridium(III)]를 각각 host와 dopant로 사용하였다. 정공 차단층 및 전자 수송층 두 개의 역할로 사용 가능한 TPBI(1,3,5-tris(2-N-phenylbenzimidazolyl) benzene)를 진공 열증착법으로 막을 형성하였다. 전자주입층으로 LiF(lithium flouride)와 음극으로 Al(aluminum)을 증착하여 최종적으로 ITO/PEDOT:PSS/PVK:Ir(ppy)3/TPBI/LiF/Al 구조를 갖는 녹색 형광:인광 혼합 유기 발광 다이오드를 제작하였다.
백승준(Baek Seung-jun),강민호(Kang Min-ho),오재국(Oh Jae-guk),김우순(Kim Woo-sun),김동현(Kim Dong-hyun) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Common difference in product that is required in super minuteness processing causes important effect to work-piece. In this treatise fixing method of existent structure using air-absorption power that is other method Simulation incidental and value fill. This could get result that lay more than existent fixture fixing. Also, to processing product by shape accuracy elevation in forward super minuteness processing development contribute can.