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OAuth 2.0 기반 CoAP 인증 프레임워크 설계 및 구현
김경한,임현교,허주성,한연희,Kim, Kyoung-Han,Lim, Hyun-Kyo,Heo, Joo-Seong,Han, Youn-Hee 한국정보처리학회 2017 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.6 No.8
최근 사물인터넷에 대한 관심과 투자가 크게 증가하고 있으며 보안 측면에서 문제가 지속적으로 제기되고 있다. 그 해결책으로서 IETF ACE 워킹 그룹이 기존의 OAuth 2.0 기반으로 여러 제약적인 사물인터넷 환경에 적합한 새로운 보안 프레임워크인 ACE 프레임워크 표준을 제정 중에 있다. 그러나 새로운 경량 보안 체계를 제안하는 ACE 프레임워크를 기존 인터넷 환경에 적용하기에는 추가적인 작업이 필요하며, 이러한 추가적 비용은 IoT 환경에 OAuth 2.0의 적용을 저해하는 요인이 된다. 따라서 본 논문에서는 기존 인터넷 환경에서 활용되고 있는 보안 프로토콜인 DTLS를 기반으로 하고, OAuth 2.0의 기존 개발 동기에 맞춘 사물인터넷 인증 프레임워크를 제안하며, python 기반 오픈 라이브러리인 CoAPthon을 기반으로 제안 프레임워크 구현하며 성능을 분석한다. Recently, interest and investment in the Internet of Things (IoT) have increased significantly, and security issues are constantly being raised. As a solution, the IETF ACE Working Group is establishing the ACE framework standard, which is a new security framework for various constrained IoT environments based on the existing OAuth 2.0. However, additional work is required to apply the ACE framework, which proposes a new lightweight security system, to the existing Internet environment, and this additional cost is a factor that hinders the application of OAuth 2.0 to the IOT environment. Therefore, we propose an IoT authentication framework based on OAuth 2.0's existing development motivation, and implement a proposal framework based on CoAPthon and analyze its performance.
김경한 ( Kim Kyoung Han ),윤춘경 ( Yoon Chun Geong ) 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-
Considerable progress has been made in the application of time-domain reflectrometry(TDR) to measurement of soil water content. The TDR provides a means of monitoring the water content of soil over a wide range of values, in the field and in the laboratory The TDR measures the volumetric moisture content of the soil via a bureid sensor(probe). Probes can be buried and monitored remotely and an immediate result can be obtained. In addition to, the results are very reliable.
OAuth 2.0 기반 CoAP 인증 프레임워크의 설계
김경한 ( Kyoung-han Kim ),임현교 ( Hyun-kyo Lim ),허주성 ( Joo-seong Heo ),한연희 ( Youn-hee Han ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.2
최근 사물인터넷에 대한 관심과 투자가 크게 증가하고 있으나 보안 측면에서 문제가 지속적으로 제기되고 있다. 그 해결책으로서 기업에서는 기업 내에서 구현한 클라이언트와 서버들로만 구성되어진 자체 IoT 생태계를 구축하고 있다. 그러나 이러한 방식의 단점으로는 다양한 서드파티 어플리케이션이 해당 IoT 서버들의 자원을 활용할 수 없다는 것 이다. 따라서 본 논문에서는 이를 보안한 OAuth 2.0 기반 CoAP 인증 프레임워크의 설계를 제안한다.
김경한(Kim, Kyung-Han),김경태(Kim, Kyoung-Tae),이재구(Lee, Jae-Koo),최승욱(Choe, Seung-Wook),김훈(Kim, Hoon) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.4
This study aims to investigate the current status of the exercise special-list qualification system in Korea and figure out its problems in order to find ways to improve the system related to cultivating exercise special-lists afterwards. The paper collected and analyzed related literatures up to 2012 and conducted research on the current status of the institutions and their operation for issuing exercise-related qualifications from July 2nd till August 24th, 2012 to figure out the problems. According to the result, there are 19 private institutions to cultivate exercise specia-lists, and except for six, the rest overissue qualifications illegally not registered to government agencies. The procedures to acquire exercise-related qualifications are too diverse, and for the overissued qualifications, it is not possible to secure expertise. And the study also has inferred the problems that quality control with post-management or such is not being properly practiced and this results in reduction in service quality; thus, it seems to be needed to find various ways for the improvement. As the measures for the improvements, this study suggests the follows: reinforcing management oversight by an effective ministry in charge, inducing the qualification certification system, introducing the course completion-type qualification system, and building institutional devices to control the qualification system in general.
CoAPthon을 이용한 자원 관찰 및 블록 전송 기능 구현 및 실험
김경한 ( Kyoung-han Kim ),임현교 ( Hyun-kyo Lim ),김태형 ( Tae-hyeong Kim ),한연희 ( Youn-hee Han ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.1
최근 사물 인터넷의 핵심 프로토콜인 CoAP (Constrained Application Protocol)에 대한 활용도가 높아짐에 따라 관련 라이브러리가 등장하고 있으며 그 중 python을 기반으로한 CoAPthon은 개발이 용이한 장점 때문에 많은 관심을 받고 있다. 하지만, CoAPthon의 현재 구현 버전에는 자원 관찰 과 블록 전송의 결합 기능이 올바르게 구현되어 있지 않다. 본 논문에서는 CoAPthon에 자원 관찰 과 블록 전송의 결합 기능을 구현하고, Raspberry Pi 2에서 구현 내용을 실험하여 그 기능을 검증하였다.
12주간의 수중운동과 지상운동이 대사증후군 고령여성의 동맥경화지수 및 HOMA-IR에 미치는 영향
김경한(Kim, Kyung-Han),김경태(Kim, Kyoung-Tae) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.4
The purpose of this study is to find out about the impact factors of aquatic exercise and land exercise performed for 12 weeks on the atherogenic index and HOMA-IR among elderly women with metabolic syndrome index. For this, I have recruited 20 elderly women who belong to the category of NCEP-ATP Ⅲ metabolic syndrome among those who participate in exercise class for metabolic syndrome in Community Health Center of K city and split them evenly and randomly into two groups: aquatic exercise group and land exercise group with 10 members each. The aquarobics and aerobics have been chosen as aquatic and land exercise program, respectively. Each group has been instructed to bum 300kcal by engaging in respective exercise every day with the intensity of exercise of between HRR 60 and 85%, 60 minutes every day, three times a week, for 12 weeks in total. The measurement items before and after the exercise include total cholesterol, neutral fat, and the atherogenic index based on the relative weight of HDL-C in LDL-C after analyzing the serum lipid fraction. As a way to evaluate the insulin resistance, HOMA-IR by Matthews etc. (1985) was adopted. The data collected from this study have been analyzed through the independent t-test using SPSS 18.0 with the significance level of .05. The following conclusion has been drawn from the test results. The subjects in the aquatic exercise group have obtained a positive change in atherogenic index following the 12-week aquatic and land exercise experiment.
박경택(Kyoung Taik Park),김경한(Kyunghan Kim),김두형(Doo Hyung Kim),조규백(Gyu Baek Cho),김한메(Han Me Kim) 한국항해항만학회 2010 한국항해항만학회 학술대회논문집 Vol.2010 No.춘계
본 논문은 RTGC 시스템의 에너지 절감을 위한 에너지 저장 시스템에 대해 다룬다. 에너지 저장 시스템으로는 베터리, 슈퍼캐패시터 그리고 플라이휠의 장점과 단점이 조사되었다. 이들 에너지 저장 시스템들 중 플라이휠 에너지 저장시스템은 현재 해결되어야 할 기술 및 가격적인 측면에도 불구하고 향후 기술의 발전을 전제를 뒀을 때 매우 촉망받는 에너지 저장시스템임이 조사되었다. 또한, 컨테이너 이송에 사용되는 RTGC에서 베터리와 플라이휠 에너지 저장 시스템이 각각 사용된 경우에 대해 에너지 절감에 대한 결과가 정량적으로 조사되었다. This paper deals with energy storage system for saving the energy of RTGC(rubber tired gantry crane). Advantage and disadvantage of battery, super-capacitor, and flywheel as an energy storage system were surveyed. Even if a flywheel energy storage system includes some problems such as manufacturing technique and high price, it is surveyed with a promising energy storage system. In addition, RTGCs using battery or flywheel as the energy storage system were quantitatively presented through a survey of literatures. It was found that the both RTGC with those systems can reduced the waste of energy.
태권도 품새 수련이 고령여성의 심혈관질환 유발요인과 당내인성 변인에 미치는 효과
한승완(Han Seung-Wan),우영하(Woo Young-Ha),김경한(Kim Kyoung-Han) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.4
This study wasperformed by applying Taekwondopumsae trainingprogram to the female senior citizens who are deficient of social characteristics because of the reduced weakened sports functions to make comparative analysis of the effects of theprogram on thephysical strength, cardiovascular disease and sugar tolerance variables. The results are as follows; HDL-C increased significantly in Taekwondo group (p<.001). Both groups did not show statistically significant difference in LDL-C. They didn’t show any difference in either TG (triglyceride) or T-C. Fibrinogen decreased significantly in Taekwondo group (p<.001) while it did not show any significant difference in control group. Blood glucose was not significantly different in Taekwondo group, but it decreased in number. In control group, it decreased significantly (p<.05). While HbAlc increased in Taekwondo training group significantly (p<.05), there was no change in control group. Concluding from the above results, Taekwondo Pumsae training brought it will help the senior citizens to improve the status of fat in the blood, reduce fibrinogen, sugar tolerance factors and keep 4 kinds of CBC in normal range, which willprevent cardiovascular disease and coronary artery disease in elderly women. It will have important meaning in theprevention of age related disease of female senior citizens. Therefore it is very important to maintain and improve thephysical functions throughproper physical activities before the aging isprogressed too much in order to do healthyphysical activities in elderly women.