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Comparisons of Two Camera Configurations for Remote Iris Recognition
Dong Ik Kim,Hyun Su Jo,Gen Li,Ho Gi Jung,Kang Ryoung Park,Jai Hie Kim 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
Although iris recognition is one of the biometric techniques that showing good performance, it is not been used widely because iris image capturing needs much effort in practical situation. Thus iris image acquisition in user convenient environment is very important factor for the popularization of iris recognition. Generally, remote iris acquisition system has two cameras: scene camera for user detection and iris camera for high resolution iris image capturing. According to the geometric relation between the scene camera and iris camera, remote iris image acquisition system could be classified into three categories: separated type, parallel type and coaxial type. In particular, this paper focused on the comparison between parallel type and coaxial type in the viewpoint of y-axis displacement, yoffset. Experimental results show that if camera to target distance is getting away, the yoffset is getting smaller. It means that benefit of coaxial type is limited to the near distance and difference between coaxial type and parallel type becomes ignorable beyond a certain distance.
( Dong Ik Kim ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Among malignant tumor of the stomach, adenocarcinoma accounts for about 95% and the rest are almost lymphomas. The occurrence of primary gastric lymphoma and adenocarcinoma in the same place is rarely reported. We here report a case that primary tumor of early gastric cancer and diffuse large B cell lymphoma were detected in the same place over time interval. A 65-years old male patient was transferred to our hospital due to the further evaluation of gastric lymphoma. Before, he underwent the esophagogastroduodenoscopy for the evaluation of abdominal discomfort at the local hospital. The endoscopic examination showed huge tumor in the gastric body and the microscopic examination revealed diffuse large B cell lymphoma. The pathologist of our hospital also confi rmed diffuse large B cell lymphoma and the patient was transferred to the hematologist. The patient was treated CHOP chemotherapy with rituximab 2 times. After chemotherapy, CT scan and PET-CT scan revealed improvement of gastric lymphoma and lymphadenopathys much better. So the hematologist treated the patient same chemotherapy 2 times more, total 4 times. Then he underwent the esophagogastroduodenoscopy in our hospital. That was 4 months later after he had come to our hospital. The endoscopic examination showed the absence of huge mass, but the irregular shaped fl at elevated mucosa with ulceration in the same place of stomach. The microscopic examination revealed adenocarcinoma. Finally he has had total gastrectomy and the microscopic examination revealed adenocarcinoma and absence of lymphoma cell. Especially the concurrence of adenocarcinoma and DLBL have been reported about 10 cases. But the case occurred in the same place is very scarce. About the malignant tumor treated medication without resection like lymphoma, we must pay attention to the occurance of another cancer.
Autonomous routing control protocol for mobile ad-hoc networks
Dong-Ik Kim,Dong-Jin Kang 한국정보통신설비학회 2008 한국정보통신설비학회 학술대회 Vol.2008 No.1
A clustering scheme for ad hoc networks is aimed at managing a number of mobile devices by utilizing hierarchical structure of the networks. In order to construct and maintain an effective hierarchical structure in ad hoc networks where mobile devices may move at high mobility, the following requirements must be satisfied. The role of each mobile device for the hierarchical structure is adaptive to dynamic change of the topology of the ad hoc networks. The role of each mobile device should thus change autonomously based on the local information. The overhead for management of the hierarchical structure is small. The number of mobile devices in each cluster should thus be almost equivalent. This paper proposes an adaptive multihop clustering scheme for highly mobile ad hoc networks. The results obtained by extensive simulation experiments show that the proposed scheme does not depend on mobility and node degree of mobile devices in the ad hoc network, which satisfy the above requirements.