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클러스터 형태의 다중 인터페이스 다중 홉 인지 라디오 네트워크를 위한 제어 채널 접근 기법
이지운(Ji Wun Lee),전화숙(Wha Sook Jeon),정동근(Dong Geun Jeong) 한국정보과학회 2010 정보과학회논문지 : 정보통신 Vol.37 No.4
이 논문은 클러스터 형태의 다중 인터페이스 다중 홉 인지 라디오 환경을 위한 효율적인 제어 채널 접근 방식을 제안한다. 인지 라디오 대역 안에서 전체 네트워크 영역에 걸친 공통 채널을 확보하는 것이 어렵기 때문에, 대부분의 멀티 인터페이스 멀티 홉 인지 라디오 네트워크는 라이센스 사용자의 채널사용 현황과 같은 제어 정보의 교환을 위해 인지 라디오 대역 밖에 제어 채널을 두고 하나의 인터페이스를 제어 채널에 고정시켜 할당한다. 그러나 이러한 방식은 네트워크 인터페이스의 낭비를 초래한다. 이 연구는 인지 라디오 노드들이 다수의 데이터 채널을 통해 이웃 노드들과 연결되는 클러스터 구조 하에서 멀티 채널 상황에서의 숨겨진 노드 문제없이 데이터 채널과 제어 채널을 수시로 번갈아 가며 접근하는 방식에 대하여 고찰한다. 시뮬레이션을 사용하여 제안한 방식의 성능을 측정한다. 시뮬레이션 결과를 통해 제안한 방식이 하나의 네트워크 인터페이스를 제어 채널에 고정적으로 할당하여 데이터 전송을 하지 않는 방법에 비해 더 높은 네트워크 처리량을 보임을 확인한다. We propose the control channel access scheme for multi-interface multi-hop cognitive radio (CR) environment having a cluster structure. Due to the difficulty of obtaining common channels across the entire CR network, most multi-interface multi-hop CR networks put the control channel outside the CR bandwidth and dedicate one network interface to it in order to exchange the control information such as the activation of licensed users. However, this will be the waste of the network interface. Our focus is how to alternate between the control and the data channel without multichannel hidden node problem under the cluster structure where CR nodes connect with neighbors through multiple data channels. By using simulation, we evaluate the performance of the proposed scheme. The results show that the proposed scheme achieves higher network throughput than the dedicated scheme where one network interface card should dedicate to the control channel and cannot be used for data transmission.
Removal of Iopromide and Its Intermediates from Ozone-Treated Water Using Granular Activated Carbon
Ahn, Yong-Tae,Cho, Dong-Wan,Kabra, Akhil N.,Ji, Min-Kyu,Yoon, Yeojoon,Choi, Jaewon,Choi, Il-Hwan,Kang, Joon-Wun,Kim, Jung Rae,Jeon, Byong-Hun Springer-Verlag 2015 Water, Air and Soil Pollution Vol.226 No.10
3-D Laser Measurement using Mode Image Segmentation Method
Hak-Yong Moon,Jong-Chan Park,Wun-Dong Han,Heung-Gi Cho,Hee-Jong Jeon 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
In this paper, the 3-D measurement method of moving object with a laser and one camera system for image processing method is presented.<br/> The method of segmentation image in conventional method, the error are generated by the threshold values.<br/> In this paper, to improve these problem for segmentation image, the calculation of weighting factor using brightness distribution by histogram of stored images are proposed.<br/> Therefore the image erosion and spread are improved, the correct and reliable informations can be measured.<br/> In this paper, the system of 3-D extracting information using the proposed algorithm can be applied to manufactory automation, building automation, security guard system, and detecting information system for all of the industry areas.
한국 소아청소년 중독 환자의 경향: 국가응급진료정보망을 이용한 후향적 연구
이경재 ( Kyeongjae Lee ),김경환 ( Kyung Hwan Kim ),신동운 ( Dong Wun Shin ),박준석 ( Junseok Park ),김훈 ( Hoon Kim ),전우찬 ( Woochan Jeon ),박준민 ( Joon Min Park ),김현종 ( Hyunjong Kim ) 대한임상독성학회 2017 대한임상독성학회지 Vol.15 No.2
Purpose: This study reports the clinical features of infant, child, school aged and adolescent patients treated for acute poisoning in nationwide emergency departments (EDs). Methods: We retrospectively analyzed clinical data pertaining to patients under 19 years of age who were treated for acute poisoning in nationwide EDs from 2013 to 2015. The data were collected by the National Emergency Department Information System (NEDIS). All patients were divided into three groups: ‘Infant and child group’ (0 to 5 years), ‘school age group’ (6 to 12 years) and ‘adolescent group’ (13 to 18 years). General characteristics, Korea Standard Classification of Disease 7<sup>th</sup> (KCD-7) codes and results of care were collected. Results: There were 14,500 pediatric poisoning cases during the study period. The distribution of patient age was bimodal with two peaks among infant, child and adolescent group. The proportion of alert mentality at the ED visit of the infant and child group was 99.3%, while that of the adolescent group was 86.4%. The proportion of intentional intoxication was higher in the adolescent group (40.7%) than other age groups. Among children less than 13 years of age, various poisonous substances and therapeutic drugs were common. Conclusion: There were some clinical differences in acute poisoning patients between age groups. It is necessary to establish a preventive plan considering characteristics by age. Since the KCD-7 code has limitations in analyzing the characteristics of poisoning patients, it is necessary to consider the registration system of poisoning patients.
조정래,Sanghoon Shin,Jung-Sun Kim,고영국,홍명기,Yangsoo Jang,승기배,박헌식,Seung-Jea Tahk,임도선,Dong-Wun Jeon,In Ho Chae,김덕경,Junghan Yoon,정명호,최동훈 대한심장학회 2012 Korean Circulation Journal Vol.42 No.8
Background and Objectives: Acute aortic syndrome (AAS) is a heterogeneous group of disorders that often present with severe chest or back pain. It includes acute aortic dissection (AD), intramural hematoma (IMH), dissecting aneurysm, and penetrating aortic ulcer (PAU). The clinical picture of AAS and its prognosis have not been studied in a large number of Korean patients. Therefore, we organized a multi-cen-ter registry to identify the clinical characteristics and treatment patterns, as well as long-term outcomes in Korean patients with AAS. Subjects and Methods: Five-hundred twenty-eight patients, who had been diagnosed with AAS, were enrolled into this registry from 10centers. On a retrospective basis, we collected demographic, laboratory, imaging data, as well as follow-up clinical outcomes by reviewing medical records from individual centers. All the data were collected in core lab and analyzed in detail. Results: The mean patient age was 60.1±14.5 years; the male-to-female ratio was M : F=297 : 231. The prevalent risk factors for AAS in-cluded hypertension (361, 68.4%) and diabetes (52, 11.1%). The components of AAS that are included in this study are acute AD (446, 84.5%),IMH (57, 10.7%), and PAU (11, 2.1%). By type of AAS, patients diagnosed with Stanford A were 45.6% of enrolled patients, whereas those with Stanford B were 54.4% of enrolled patients. Among nearly half of the patients were treated with medicine (55.7%) alone, whereas 40.0%underwent surgery and 4.3% underwent endovascular treatment. Overall, the in-hospital event rate was 21.2% and the in-hospital death rate was 8.1%. The mean follow-up duration was 42.8 months and there showed 22.9% of total event and 10.1% of death during this period. Conclusion: By organizing a multi-center registry of AAS, we could identify the characteristics of AAS in real-world Korean patients. Further,prospective study is warranted with a larger number of patients.
Ko, Young-Guk,Kim, Jung-Sun,Choi, Donghoon,Hong, Myeong-Ki,Min, Pil-Ki,Yoon, Young Won,Hong, Bum-Kee,Lee, Byoung-Kwon,Kwon, Hyuck-Moon,Kim, Byeong-Keuk,Oh, Sung-Jin,Jeon, Dong-Wun,Yang, Joo-Young,Jang Elsevier 2011 INTERNATIONAL JOURNAL OF CARDIOLOGY Vol.152 No.3
<P><B>Abstract</B></P><P><B>Background</B></P><P>Siroliums-eluting stents (SES) and paclitaxel-eluting stents (PES) have been widely used for the treatment of coronary artery disease. We investigated 5-year clinical outcomes of patients treated with SES versus PES in a multicenter registry.</P><P><B>Methods</B></P><P>We used a propensity score matching method with 2:1 matching, including 512 patients treated with SES and 256 patients treated with PES from March 2003 to December 2004. The primary endpoint was major adverse cardiac events, which included all-cause death, myocardial infarction (MI), and target vessel revascularization (TVR).</P><P><B>Results</B></P><P>After matching, baseline characteristics were similar between the two groups. At 5years, cumulative survival free of major adverse cardiac events, MI, and stent thrombosis did not differ between the two groups. Survival free of TVR at 5years was higher in the SES group (88.4%) than the PES group (84.3%, Log-rank <I>p</I>=0.016). In contrast to the trend toward more likely target lesion revascularization in the PES group during the first 2years (hazard ratio 0.62, <I>p</I>=0.057), target lesion revascularization tended to occur more frequently in the SES group from 2 to 5years (hazard ratio 2.26, <I>p</I>=0.099).</P><P><B>Conclusions</B></P><P>Long-term risk of TVR was slightly lower with SES, compared with PES, despite no significant difference in major adverse cardiac events. However, the SES group had more frequent target lesion reintervention 2 to 5years after stent implantation, whereas reintervention in the PES group occurred mainly within the first 2years. This may reflect the temporal difference in neointimal growth of the two stent types.</P>