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특징 공간상에서 의 확률적 해석에 기반한 부분 인식 기법에 관한 연구
박보건,이경무,이상욱,이진학 한국통신학회 2001 韓國通信學會論文誌 Vol.26 No.11
본 논문에서는 관계 벡터 공간상의 특징 대응에 관한 확률적 해석에 기반한 새로운 부분 인식 기법을 제안한다. 효과적인 인식을 위해 물체를 관계 속성 그래프(Attributed Relational Graph; ARG)와 관계 벡터 공간들의 집합으로 표현한다. 또한 잡음이나 특징 소실로 인한 왜곡을 관계 벡터 공간에서의 관계 벡터 분포에 대한 왜곡으로 확률적으로 모델링한다. 제안하는 부분 인식 기법은 두 단계로 이루어진다. 우선 지역적인 특징(local feature)과 구조적인 일관성(structural consistency)을 사용하여 후보집합을 추출한다. 이렇게 추출된 후보집합 각각에 대해 관계 벡터 공간상에서의 에러 분석과 반복적인 voting 알고리즘을 통해 특징 소실을 검출한다. 실제 영상에 대한 실험 결과를 통해 제안한 알고리즘이 잡음이나 가리어짐이 심한 경우에도 강건한 성능을 보임을 알 수 있으며, 릴렉세이션(relaxation) 기법과 수행 시간 비교 분석을 통해 계산량 측면에서의 성능 향상을 확인할 수 있다. In this paper, we propose a novel 2-D partial matching algorithm based on model-based stochastic analysis of feature correspondences in a relation vector space, which is quite robust to shape variations as well as invariant to geometric transformations. We represent an object using the ARG (Attributed Relational Graph) model with features of a set of relation vectors. In addition, we statistically model the partial occlusion or noise as the distortion of the relation vector distribution in the relation vector space. Our partial matching algorithm consists of two-phases. First, a finite number of candidate sets areselected by using logical constraint embedding local and structural consistency Second, the feature loss detection is done iteratively by error detection and voting scheme thorough the error analysis of relation vector space. Experimental results on real images demonstrate that the proposed algorithm is quite robust to noise and localize target objects correctly even inseverely noisy and occluded scenes.
박보건,김석범,박용준,Park, Bo-Gun,Kim, Seuk-Buom,Park, Yong-Joon 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.9
Three-dimensionally ordered macro-porous Sn-C composites were prepared by using polystyrene microsphere as a template. The Sn-C composites were composed of well-interconnected pore with circular shape and wall structure with wall thickness of a few tens of nano-meters. This porous three-dimensional structure is readily and uniformly accessible to the electrolyte, which facilitates lithium ion diffusion during charge-discharge reactions. The wall thickness of the composites was increased as the increase of Sn content of the composite. From EDS analysis, it is confirmed that the Sn was dispersed uniformly in Sn-C composites. The capacity was increased as the Sn content increased, which is due to Sn anode with high capacity. The Sn-C composites with high Sn content showed superior cyclic performances. Such enhancement is ascribed to the thick wall thickness and small pore size of the sample with high Sn content. The Sn-C composite with Sn 30 wt% showed relatively high capacity and stable cycle life, however, the stability of the 3-dimensional structure should be enhanced by further work.
Li[Ni0.3Co0.4Mn0.3]O2 양극물질의 Li-La-Ti-O코팅 효과
이혜진,박보건,유제혁,김석범,박용준,윤수현,김관수 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.10
Li(Ni, Co, Mn)O2 has been known as one of the most promising cathode materials for lithium secondary batteries. However, it has some problems to overcome for commercialization such as inferior rate capability and unstable thermal stability. In order to address these problems, surface modification of cathode materials by coating has been investigated. In the coating techniques, selection of coating material is a key factor of obtaining enhanced properties of cathode materials. In this work, we introduced solid electrolyte (Li-La-Ti-O) as a coating material on the surface of Li[Ni0.3Co0.4Mn0.3]O2 cathode. Specially, we focused on a rate performance of Li-La-Ti-O coated Li[Ni0.3Co0.4Mn0.3]O2 cathode. Both bare and Li-La-Ti-O 2 wt.% coated sample showed similar discharge capacity at 0.5C rate. However, as the increase of charge-discharge rate to 3C, the coated samples displayed better discharge capacity and cyclic performance than those of bare sample.
양극동의 전해정련시 발생된 양극슬라임으로부터 귀금속(Ag, Au) 회수에 대한 연구
김영암,박보건,박재훈,황수현,Kim, Young-Am,Park, Bo-Gun,Park, Jae-Hun,Hwang, Su-Hyun 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.6
Recently rapid economic growth and technological development have led to an increase in the generation of waste electrical and electronic equipment (WEEE). As the amount of electric and electronic waste generated increases, the importance of processing waste printed circuit boards (PCB) is also increasing. Various studies have been conducted to recycle various valuable metals contained in a waste PCB in an environmentally friendly and economical manner. To get anode slime containing Ag and Au, Anode copper prepared from PCB scraps was used by means of electro-refining. Ag and Au recovery was conducted by leaching, direct reduction, and ion exchange method. In the case of silver, the anode slime was leached at 3 M $HNO_3$, 100 g/L, $70^{\circ}C$, and Ag was recovered by precipitation, alkali dissolution, and reduction method. In the case of gold, the nitrate leaching residues of the anode slime was leached at 25% aqua regia, 200 g/L, $70^{\circ}C$, and Au was recovered by pH adjustment, ion exchange resin adsorption, desorption and reduction method. The purity of the obtained Au and Ag were confirmed to be 99.99%.
Li[Ni<sub>0.3</sub>Co<sub>0.4</sub>Mn<sub>0.3</sub>]O<sub>2</sub> 양극물질의 Li-La-Ti-O코팅 효과
이혜진,윤수현,박보건,유제혁,김관수,김석범,박용준,Lee, Hye-Jin,Yun, Su-Hyun,Park, Bo-Gun,Ryu, Jea-Hyeok,Kim, Kwan-Su,Kim, Seuk-Buom,Park, Yong-Joon 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.10
Li(Ni, Co, Mn)$O_2$ has been known as one of the most promising cathode materials for lithium secondary batteries. However, it has some problems to overcome for commercialization such as inferior rate capability and unstable thermal stability. In order to address these problems, surface modification of cathode materials by coating has been investigated. In the coating techniques, selection of coating material is a key factor of obtaining enhanced properties of cathode materials. In this work, we introduced solid electrolyte (Li-La-Ti-O) as a coating material on the surface of $Li[Ni_{0.3}Co_{0.4}Mn_{0.3}]O_2$ cathode. Specially, we focused on a rate performance of Li-La-Ti-O coated $Li[Ni_{0.3}Co_{0.4}Mn_{0.3}]O_2$ cathode. Both bare and Li-La-Ti-O 2 wt.% coated sample showed similar discharge capacity at 0.5C rate. However, as the increase of charge-discharge rate to 3C, the coated samples displayed better discharge capacity and cyclic performance than those of bare sample.
허철웅 ( Cheal Wung Huh ),윤영훈 ( Young Hoon Youn ),정다현 ( Da Hyun Jung ),김도환 ( Do Whan Kim ),고보건 ( Bo Gun Kho ),김지현 ( Jie Hyun Kim ),박효진 ( Hyo Jin Park ),이상인 ( Sang In Lee ) 대한소화기학회 2012 대한소화기학회지 Vol.59 No.4
Cytomegalovirus (CMV) colitis is common among immunocompromised patients, and often diagnosed by pathologic confirmation because it is associated with a diverse spectrum of clinical and endoscopic features. However, Crohn`s disease has no definitive diagnostic criteria, but longitudinal ulcers and cobble stone appearance are accepted as typical endoscopic features of Crohn`s disease. An 83 year-old male with a history of radiotherapy for hypopharyngeal cancer visited our hospital with a complaint of melena for 1 week. His colonoscopic exam showed multiple longitudinal ulcers along the entire colon. Most of the ulcers were longer than 4 cm, these endoscopic findings were suspected as typical endoscopic features of Crohn`s disease. Pathologic reports revealed multiple inclusion bodies with CMV on immunohistochemistry. He was finally diagnosed as having CMV colitis, and received a 3 week-course of intravenous ganciclovir. A colonoscopic follow-up showed complete healing of the multiple longitudinal ulcers, and he is doing well now without further treatment. (Korean J Gastroenterol 2012;59:303-307)