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조병민,Maeda Masaki,김태진 한국지진공학회 2015 한국지진공학회논문집 Vol.19 No.2
The purpose of this study is to improve the previous damage evaluation model for RC members which is proposed by Igarashi[1] in 2010.The previous model was not confirmed by enough data of damage such as, residual crack length, width and area for exfoliation of concrete, etc. In addition, validation of the model is still insufficient. Therefore, experiment of a real-scale RC structure and experiment of RC columns using the high-strength concrete were conducted to gather the data of damage in RC members. The investigation has been conducted gathering the data not only additional experiments data but also existing data for modification of damage evaluation model. It has been investigated on changing damage in RC due to axial force ratio, shear reinforcement and shear span ratio. As a result, several problems were founded in the previous model, such as, hinge length(lp), spacing of flexural crack(Sav,f), total width of flexural cracks regulated by maximum width of flexural crack(nf) and total width of shear cracks regulated by maximum width of shear crack(ns). New model is proposed and evaluated the damage properly.
용액/용융 전기방사법으로 제조된 Poly($\varepsilon$-caprolactone)(PCL) 웹의 형태 및 열적 특성 비교
조병민,남영식,오태환,정종호,박원호,Cho, Byoung-Min,Nam, Young-Sik,Oh, Tae-Hwan,Jung, Jong-Ho,Park, Won-Ho 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.2
PCL fiber web was fabricated through solution/melt electrospinning of PCL resin. PCL nanofibers were obtained by solution electrospinning of 10.5 wt% PCL solution and the resulting average fiber diameters were varied with the range of 150-500 nm. Melt electrospinning method has the advantage of solvent-free process and it is more eco-friendly than solution electrospinning process. The relationship between processing conditions and fiber morphologies of melt electrospun fibers was investigated and it was found that the temperature in the syringe and flow rate were the main factors in determining the average fiber diameter. In addition, thermal properties of PCL fibers obtained by solution/melt electrospinning were compared with PCL chip.
소요차량을 최소화하는 기간차량경로 문제에 관한 2 단계 발견적 기법
조병민(Byeong-Min Cho),김준규(Jun-Gyu Kim),이동호(Dong-Ho Lee) 한국산업경영시스템학회 2008 한국산업경영시스템학회 학술대회 Vol.2008 No.하계
기간차량경로 문제는 자원제약을 고려한 차량경로문제를 다 기간으로 확장한 형태의 문제로 역방향 로지스틱스의 폐기물 혹은 재활용품 수거에 관련된 주요한 운영 문제들 중의 하나이다. 각 고객에 대해서는 계획기간 중에 방문해야 하는 횟수가 정해져 있어 방문날짜 조합을 결정해야 하며 주어진 방문날짜 조합 하에 각 기간의 차량경로도 결정해야 한다. 주요한 제약조건으로는 차량의 용량제약과 각 기간의 가용 시간제약이 있으며 소요차량의 대수를 최소화하는 것을 목적으로 한다. 본 연구에서는 대상 문제의 복잡도로 인하여 초기해를 구하고 그 해를 개선하는 2 단계 발견적 알고리듬을 제안하였으며 다양한 문제들에 대한 계산실험 결과 본 연구에서 제안하고 있는 발견적 알고리듬이 기존 알고리듬보다 우수함을 보였다.
조병민,김태진 한국지진공학회 2015 한국지진공학회논문집 Vol.19 No.2
The purpose of this study is to improve the previous damage evaluation model for RC members which is proposed by Igarashi[1] in 2010.The previous model was not confirmed by enough data of damage such as, residual crack length, width and area for exfoliation of concrete, etc. In addition, validation of the model is still insufficient. Therefore, experiment of a real-scale RC structure and experiment of RC columns using the high-strength concrete were conducted to gather the data of damage in RC members. The investigation has been conducted gathering the data not only additional experiments data but also existing data for modification of damage evaluation model. It has been investigated on changing damage in RC due to axial force ratio, shear reinforcement and shear span ratio. As a result, several problems were founded in the previous model, such as, hinge length(lp), spacing of flexural crack(Sav,f), total width of flexural cracks regulated by maximum width of flexural crack(nf) and total width of shear cracks regulated by maximum width of shear crack(ns). New model is proposed and evaluated the damage properly.
A Two-Stage Heuristic for Period Vehicle Routing:Minimizing the Fleet Size
조병민(Byeong-Min Cho),김준규(Jun-Gyu Kim),이동호(Dong-Ho Lee) 한국산업경영시스템학회 2008 한국산업경영시스템학회지 Vol.31 No.3
기간차량경로 문제는 차량용량제약을 고려한 차량경로문제를 다 기간으로 확장한 형태의 문제로 역방향 로지스틱스의 폐기물 혹은 재활용품 수거에 관련된 주요한 운영 문제들 중의 하나로 각 고객에 대해서는 계획기간 중에 방문해야 하는 횟수가 정해져 있어 방문날짜 조합을 결정해야 하며 주어진 방문날짜 조합 하에 각 기간의 차량경로도 결정해야 한다. 주요한 제약조건으로는 차량의 용량제약과 각 기간의 가용 시간제약이 있으며 소요차량의 대수를 최소화하는 것을 목적으로 한다. 본 연구에서는 대상 문제의 복잡도로 인하여 초기해를 구하고 그 해를 개선하는 2 단계 발견적 알고리듬을 제안하였으며 다양한 문제들에 대한 계산실험 결과 본 연구에서 제안하고 있는 발견적 알고리듬이 기존 알고리듬보다 우수함을 보였다
C++ 언어를 위한 데이터 obfuscation 도구 구현 및 테스트
조병민(ByoungMin Cho),노진욱(JinUk Noh),오현수(Hyunsoo Oh),장혜영(Hye-Young Chang),정민규(Mingyu Jung),이승원(Seungwon Lee),박용수(Yongsoo Park),우제학(Jehak Woo),조성제(Seongje Cho) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.1
상용 응용 소프트웨어들은 주요 정보 및 알고리즘들을 내포하고 있어, 악의적인 역공학자들에 의해 특정 소프트웨어를 decompile하여 자료구조 및 제어 흐름을 분석하려는 공격이 이루어 지고 있다. 본 논문에서는 MS 윈도우 XP 상의 Visual C++ (MFC 포함) 프로그램을 역공학 공격으로부터 보호하기 위한 데이터 obfuscator를 구현하고 그 성능을 평가한다. 구현한 obfuscator는 C++ 소스코드를 입력 받아 3가지의 데이터 obfuscation 알고리즘을 적용한 후, 이를 다시 소스코드로 재생성하는 도구로 큰 성능저하 없이 구현 가능함을 알 수 있다.
비 카세트 방식과 카세트 방식을 이용한 [<sup>68</sup>Ga]PSMA-11의 자동 합성 방법 비교
박현식,조병민,안현호,이홍진,이진형,이경재,이병철,이원우,Hyun-Sik, Park,Byeong-Min, Jo,Hyun-Ho, An,Hong-Jin, Lee,Jin-Hyeong, Lee,Gyeong-Jae, Lee,Byung-Chul, Lee,Won-Woo, Lee 대한핵의학기술학회 2022 핵의학 기술 Vol.26 No.2
Purpose [<sup>68</sup>Ga]PSMA-11 is needed the high reproducibility, excellent radiochemical yield and purity. In term of radiation safety, the radiation exposure of operator for its production also should be considered. In this work, we performed a comparative study for the fully automated synthesis of [<sup>68</sup>Ga]PSMA-11 between non-cassette type and cassette type. Materials and Methods Two different type of modules (TRACERlab FX N pro for non-cassette type and BIKBox for cassette type) were used for the automated production of [<sup>68</sup>Ga]PSMA-11. According to the previously identified elution profile, Only 2.5 ml with high radioactivity was used for the reaction. After adjusting the pH of the reaction solution with HEPES buffer solution, the precursor was added and reacted with at 95 ℃ for 15 minutes. The reaction mixture was separated and purified using a C18 light cartridge. The product was eluted with 50% EtOH/saline solution and diluted with saline. It was completed by sterilizing filter. In the non-cassette type, the aforementioned process must be prepared directly. However, in the cassette method, synthesis was possible simply by installing a kit that was already completed. Results Both total [<sup>68</sup>Ga]PSMA-11 production time were 25±3(non-cassette type) and 23±3 minutes(cassette type). The radiochemical yield of the non-cassette type(65.5±5.7%) was higher than that of the cassette type(61.6±4.8%) after sterilization filter. The non-cassette type took about 120 minutes of preparation time before synthesis due to washing of synthesizer and reagent preparation. However, since the cassette type does not require washing and reagent preparation, it took about 20 minutes to prepare before synthesis. Both type of synthesizer had a radiochemical high purity(>99%). Conclusion The non-cassette type production of [<sup>68</sup>Ga]PSMA-11 showed higher radiochemical yield and lower cost than the cassette type. However, The cassette type has an advantage in terms of preparation time, convenience, and equipment maintenance.