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객체추적을 위한 적응적 정합 블록을 이용한 블록정합 알고리즘
김진태,안수홍,오정수,Kim, Jin-Tea,Ahn, Soo-Hong,Oh, Jeong-Su 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.2
블록정합 기법을 이용한 객체추적에서 크기가 다양하고 수시로 변하는 객체를 추적하기 위해 고정 정합블록을 사용하는 것은 적합하지 못하다. 본 논문은 동적 환경을 위한 적응적 정합블록을 정의하고, 이를 위한 블록정합 알 고리즘을 제안한다. 정합블록은 $42{\times}42$ 화소의 넓은 영역에 $10{\times}10$ 화소의 주 블록과 $6{\times}6$ 화소의 부 블록 8개로 구성되고, 영역 중심에 위치한 주 블록은 객체 블록으로 사용되고, 영역의 외곽에 위치한 부 블록은 객체블록을 위한 후보 블록으로 사용된다. 제안된 알고리즘은 부 블록에서 이전 10 프레임의 움직임 벡터를 이용해 객체블록을 추출하고, 주 블록과 추출된 객체블록을 이용해 블록정합을 수행한다. 성능 평가를 위한 실험들은 제안된 알고리즘이 정합블록에서 유효한 객체블록만을 적절히 추출하고, 자유로운 움직임을 갖는 객체를 영상의 중심 영역에 유지시켜 주는 것을 보여주고 있다. In object tracking using the block mating algorithm, it is not proper to use a fixed matching block to track an object of which size may be various and can be changed at any time. This paper defines an adaptive matching block for the dynamic environment and proposes a block matching algorithm for it. The matching block is composed of a main-block of $10{\times}10$ pixels and 8 sub-blocks of $6{\times}6$ pixels in a wide area of $42{\times}42$ pixels, the main-block located its center is used as an object block, and the sub-blocks located its boundary are used as candidates for the object block. The proposed algorithm extracts the object blocks from the sub-blocks by using their motion vectors for 10 previous frames and performs the block matching with the main block and them. The experiments for perform estimation show that the proposed algorithm extracts just valid object blocks from the matching block and keeps an object having free movement in image center area.
Divinyl Sulfone으로 가교된 히알루론산 마이크로비드의 특성평가
김진태,이득용,장주웅,김태형,장용운,Kim, Jin-Tae,Lee, Deuk Yong,Jang, Ju-Woong,Kim, Tae-Hyung,Jang, Yong-Wun 대한의용생체공학회 2013 의공학회지 Vol.34 No.3
Hyaluronic acid(HA) microbeads were synthesized by dropping the sodium hyaluronate(Streptococcus) solutions in NaOH into a solution mixture of divinyl sulfone(DVS) in 2-methyl-1-propanol, followed by stirring, cleaning and drying process at room temperature. The initial experimental conditions are crosslinking time(CLTi) of 5 h, crosslinking temperature(CLTe) of room temperature, injection air pressure(IAPr) of 5 psi, and DVS concentration( DVSc) of 0.2 vol%, respectively. Then, parametric studies were performed by varying the parameters to investigate the morphology, the porosity, the swelling ratio and the size of the beads. The microbead size pattern was not regular to function of the degree of crosslink. It was observed that the swelling ratio, the degree of crosslink, and the pore size can be controlled by adjusting the CLTi, CLTe and DVSc. Among the parameters investigated, the smallest bead size can be achieved by varying the CLTi parameter. The lowest swelling ratio, as an indication of the highest degree of crosslink, can be obtained by varying CLTe.
김진태,조명철,전국진,박광호,허종기,Kim, Jin-Tae,Cho, Myung-Chul,Jeon, Kug-Jin,Park, Kwang-Ho,Huh, Jong-Ki 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.2
Impacted third molars of the mandible are generally found at or close to the second molar. If the third molar is impacted far distant from its original site, it may be affected by cysts or tumors. Ectopic impaction of third molar in the condyle area is very rare. Furthermore, impaction without cystic lesion is even less common. The etiology of migration of the mandibular third molar without cystic lesion is unknown. So periodical X-ray taking is essential.
다해상도 영상과 시각 효과를 결합한 영상 부호화에 관한 연구
김진태,구하성,김동욱,Kim, Jin-Tae,Gu, Ha-Seong,Kim, Dong-Uk 한국정보처리학회 2001 정보처리학회논문지B Vol.8 No.3
본 논문에서는 HDTR, 디지털 TV, 영상전화, 멀티미디어 영상 등의 다양한 영상에 적용할 수 있는 영상 부호화 기법을 제안한다. 효율적인 영상 압축을 위하여 움직임에 따른 인간의 시각 효과 특성을 결합한 영상 부호화 기법이다. 입력 영상은 웨이브릿 변환을 통하여 다해상도 영상으로 구성된다. 데이터 압축은 저주파수 대역의 움직임 벡터를 움직임 정도에 따라 고주파수 대역 성분들을 처리함에 의해 얻어진다. 즉, 공간과 방향 주파수에 감도에 따라 인간의 눈에 민감하지 않은 대역을 제거한다. 대역내의 모든 블록을 균일하게 처리하는 기존의 방법에 비해 제안한 방법은 같은 전송율에서 재생 영상의 우수한 화질을 얻었다.
김진태,김성일,정연호,Kim, Jin-Tae,Kim, Sung Il,Joung, Yeun-Ho 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.3
In this paper, we present a MEMS (micro-electro-mechanical system) implantable blood pressure sensor which has designed and fabricated with consideration of size, design flexibility, and wireless detection. Mechanical and electrical characterizations of the sensor were obtained by mathematical analysis and computer aided simulation. The sensor is composed of two coils and a air gap capacitor formed by separation of the coils. Therefore, the sensor produces its resonant frequency which is changed by external pressure variation. This frequency movement is detected by inductive coupling between the sensor and an external antenna coil. Theoretically analyzed resonant frequency of the sensor under 760 mmHg was calculated to 269.556 MHz. Fused silica was selected as sensor material with consideration of chemical and electrical reaction of human body to the material. $2mm{\times}5mm{\times}0.5mm$ pressure sensors fitted to radial artery were fabricated on the substrates by consecutive microfabrication processes: sputtering, etching, photolithography, direct bonding and laser welding. Resonant frequencies of the fabricated sensors were in the range of 269~284 MHz under 760 mmHg pressure.
ESS 안전성 개선을 위한 결로 운전 조건 고려 고체절연물 연면 절연파괴특성 분석
김진태,이승용,김지영,석복렬,Kim, Jin-Tae,Lee, Seung-Yong,Kim, Ji-young,Seok, Bok Yeol 한국전력공사 2021 KEPCO Journal on electric power and energy Vol.7 No.2
As the large-scale renewable energy power plant increases, the high-capacity and compact Energy Storage System (ESS) is required. However, this trend could reduce the insulation reliability of ESS. In this study, the surface flashover characteristics for four types of solid insulators are investigated in the uniform electric field with AC and Lightning Impulse (LI) voltage waveforms under various contamination levels. In addtion, insulator surfaces are compared based on the contact angle before and after surface flashover. The experimental results show that AC flashover voltage is dependent on the materials and the contamination level, but LI flashover voltage is only associated with the contamination level. Especially, AC flashover voltage of PC (PolyCarbonate) is higher than that of other insulators, which is associated with the unique and sequential creepage discharge propagation pattern of PC. The localized discharges on the surface of PC form corresponding tracking points. Then, the interconnected trackings result in the complete flashover. This flashover patterns degrade the surface of PC much more than that of epoxy and Bulk Molding Compoud (BMC). Thus, the contact angle of PC is significantly reduced compared to that of other insulators. The increased hydrophilicity in the surface of PC enhances the insulator surface conductivity.