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지능형 다중 화상감시시스템을 위한 움직이는 물체 추적 및 보행자/차량 인식 방법
이삭,조재수,Lee, Saac,Cho, Jae-Soo 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.2
In this paper, we propose a tracking and recognition of pedestrian/vehicle for intelligent multi-visual surveillance system. The intelligent multi-visual surveillance system consists of several fixed cameras and one calibrated PTZ camera, which automatically tracks and recognizes the detected moving objects. The fixed wide-angle cameras are used to monitor large open areas, but the moving objects on the images are too small to view in detail. But, the PTZ camera is capable of increasing the monitoring area and enhancing the image quality by tracking and zooming in on a target. The proposed system is able to determine whether the detected moving objects are pedestrian/vehicle or not using the SVM. In order to reduce the tracking error, an improved camera calibration algorithm between the fixed cameras and the PTZ camera is proposed. Various experimental results show the effectiveness of the proposed system. 본 논문에서는 지능형 다중 화상감시시스템에 응용할 수 있는 움직이는 물체 추적 및 보행자/차량 인식 방법을 제안한다. 지능형 다중 화상감시시스템은 다수의 고정형 카메라와 한 대의 PTZ 카메라로 구성되며, 고정형 카메라에서 검출된 움직이는 물체들을 PTZ 카메라로 팬/틸트/줌 제어하고, 보행자인지 또는 차량인지를 자동으로 인식한다. 넓은 영역을 감시하는 고정된 카메라에서 검출된 물체는 너무 작고, 변별력이 떨어지는 문제가 있다. 이러한 문제를 극복하기 위해 PTZ 카메라를 통한 특정 움직이는 물체를 팬/틸트/줌인 제어함으로써 움직이는 물체의 변별력과 감시성능을 높일 수 있다. 제안된 시스템은 움직이는 물체를 추적하는 기능 외에 SVM 학습알고리즘을 이용하여 검출된 물체가 보행자 또는 차량인지를 판단할 수도 있다. 그리고 추적에러를 줄이기 위해 기존의 고정된 카메라와 PTZ 카메라간의 캘리브레이션 방법을 개선한다. 다양한 실험결과를 통하여 제안한 시스템의 효용성을 입증하였다.
이삭(Sak LEE),이동원(Dong-Won LEE),김병지(Byung-Ji KIM),권순범(Soon-Bum KWON) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Jets issuing from a conventional nozzle and convergent nozzles of a constant expansion rates and a certain normal using an annular slit are compared to investigate the characteristics of the 3 jets. In experiments, to compare the characteristics between jets, the nozzle exit mean velocity is fixed as 90㎧. The pressures along the jet axis and radial directions is measured by scanning valve system moving with 3-axis auto-traverse unit, and the velocity distribution can be obtained by calculation from the measured static and total pressures. To obtain the highly stable and convergency jets, a nozzle has to be designed with an annular slit connected to an conical cylinder, furthermore, the flow through aconstant expansion rate nozzle using annular slit is the most probable. And the pressure drop along the nozzle for the constant expansion rate nozzle is small.
초등 영어 학습에서 실제 자료와 제작 자료의 효과 고찰
이삭(Lee Sak) 한국초등영어교육학회 2016 초등영어교육 Vol.22 No.2
This research investigates the effects of authentic materials and artificial materials on English learning in the primary school classrooms in terms of language learning, task involvement, and learner interest. The two types of materials were alternately used to teach English to 38 students in the two intact classes of grade 6 in a counterbalanced manner. The effects of material types were tested through language skills (i.e., speaking, listening, reading, and writing), observation scales, surveys and interviews in order to see if there are any differential effects on leaners. A confounding variable was the learner’s level of English proficiency. The statistical analyses of data revealed that there were significant interactional effects between the type of material and the learner level. For the upper-level learners, authentic materials were effective only in listening with no significant differences in the other skills. For the mid-level learners, artificial materials were effective only in writing with no differences in the other skills. For the low-level learners, artificial materials worked much more effectively on all four skills. As for task involvement, the upper-level learners obtained higher scores with authentic materials whereas the low-level learners did so with artificial materials. The mid-level learners showed no statistical differences in the type of material. As for learner interest, the upper-level learners showed more interests with authentic materials, whereas the low-level learners did so with artificial materials. The mid-level learners did not show any preferences for the type of material. This study suggests that teachers need to take careful consideration of learner level when exploiting teaching materials in English classes.
비디오 컨퍼런싱 활용 영미아동문학 기반 세계시민교육: 학습자의 인식 분석 및 초등영어교육에의 활용 방안
이삭(Lee, Sak),윤택남(Yoon, Tecnam) 한국초등영어교육학회 2021 초등영어교육 Vol.27 No.3
This study conducted English and American children’s literature based global citizenship education using video conferencing technology. By doing so, the researchers aimed to investigate the learners’ production traits, the formation process of global citizenship and learners’ perceptions. To accomplish the purpose, the researchers chose three topics related to global citizenship education and four books containing those themes. Learners’ reflection journal writings, transcribed oral presentation data, and pre- and post-survey results of learners’ global citizenship were collected and analyzed. The results were as follows. First, learners were found to react to the literature upon their prior experiences and knowledge. Also, they use language as a mediating tool to activate their thinking skills, rather than as a learning object. While participating the activities, learners’ oral and written production were found to be unbalanced. Second, learners global citizenship were developed based on four stages: emotional empathy, hope for the problem solving and change, an application to their lives, and the practice of social solidarity actions. Lastly, based on the results, the effective ways to apply English and American children’s literature based global citizenship education using video conferencing on primary English education were sought.
마이크로 플루이딕 칩을 기반으로 한 크레아티닌 여과장치
이삭(Sack Lee),신동규(Dong-Gyu Shin),응웬탄콰(Thanh Qua Nguyen),박우태(Woo-Tae Park) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.12
매년마다 신장질환으로 고통 받는 사람들이 증가하는 추세이다. 가장 흔한 치료법 중 하나는 혈액 투석인데, 이 방법은 많은 시간이 걸리고, 비용이 많이 드는 방법이다. 이러한 이유 때문에, 인공신장연구의 중요성이 대두되고 있다. 혈액에서 크레아티닌을 여과하는 것은 신장의 주요 기능 중 하나이다. 우리는 이 기능에 초점을 맞춘 새로운 2 채널 마이크로 플루이딕 칩을 고안하였다. 두 개의 PDMS 층을 결합하기 위하여, 아크릴을 가공한 하우징 시스템이 개발하였으며, 이 방법은 여과막을 쉽게 바꿀 수 있다는 이점이 있다. 우리는 알루미늄 양극 산화물(AAO)을 여과막으로 사용하였다. 여과된 용액은 자페반응(Jaffe reation)을 이용하여, 크레아티닌 농도별 흡광도 차이를 분석하였다. 크레아티닌의 양에 대한 표준식을 만들어, 측정한 데이터를 보간하여 여과된 용액의 농도를 확인하였다. 실험을 통하여 유량 및 크레아티닌 농도에 따른 여과율을 얻을 수 있었다. The number of people suffering from renal disease increases every year. One of the most common treatments (clinical care options) for renal diseases is hemodialysis. However it takes a long time and has a high cost. Therefore, the importance of artificial kidney research has risen. Filtering creatinine from blood is one of the prime renal functions. Thus, we designed a novel two channel microfluidic chip focused on that function. In order to bond the individual polydimethylsiloxane layers, we have developed a housing system using acrylic plastic frame. This method has significant advantages in changing filter membranes. We use anodic aluminum oxide for the filter membrane. We analyzed the difference in the absorbance values for various creatinine concentrations using the Jaffe reaction. For the purpose of acquiring a standard equation to quantify the creatinine concentration, we interpolated the measured data and confirmed the concentration of the filtered solution. Through this experiment, we determined how the filtration efficiency depended on the flow rate and creatinine concentration.