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대한치주과학회지에 게재된 논문의 통계방법 평가(2000-2006)
김양중,장현선,김병옥,Kim, Yang-Jung,Jang, Hyun-Seon,Kim, Byung-Ock 대한치주과학회 2009 Journal of Periodontal & Implant Science Vol.39 No.4
Purpose: This article is purposed to present the correct statistic method by pointing out the statistical errors after analyzing the method of articles that were published in Korean Academy Journal of Periodontology and made statistic processes in them. Methods: 488 science papers which being put in Korean Academy Journal of Periodontology published from 2000 to 2006 was divided according to year. Results: In the 308 articles that applied statistic methods, 59 articles (50.0%), the largest portion of all, were included the case that applied incorrect parametric statistic method when needed to apply parametric statistics and 38 articles (32.2%) were included in the case that applied incorrect parametric statistic method when needed to apply non-parametric statistics. Conclusions: It is necessary to present the cases of inappropriate statistical methods in order to improve the quality of academic researches. Also, to apply adequate methods of statistics, it is suggested to report the articles periodically which are comparing and analyzing the statistical methods that are applied in the international articles in periodontal field.
김양중,이동규,정일영,Kim, Yang-Jung,Lee, Dong-Gyu,Jeong, Il-Yeong 한국통신학회 2007 정보와 통신 Vol.24 No.3
NGN (Next Generation Network)은 현재 IP기반의 네트워크 기능을 효과적으로 수용하면서 기존의 IP 및 전기통신 서비스뿐만 아니라 앞으로 예상되는 IP 기반 서비스를 효율적으로 제공하기 위한 표준 네트워크 프레임워크라고 여겨진다. 이를 표준화하기 위하여 ITU-T SG13 및 NGN-GSI (NGN-Global Standards Initiative)에서 ITU-T의 관련 연구 그룹들이 참여하여 요구되는 네트워크 및 서비스의 표준화를 매우 적극적으로 추진하고 있다. 우리나라의 BcN도 ITU-T의 NGN 표준화 결과 및 국내 상황을 고려하여 표준모델을 설정하고, 이를 기반으로 IP 기반의 광대 역 고품질 네트워크 프레임워크 틀을 만들어 가고 있다. 본고는 이러한 국내외 상황을 고려한 BcN/NGN 표준화 동향 및 ITU-T NGN의 프레임워크 및 구조, NGN의 서비스 기능 구조, NGN의 자원 관리 및 제어, 유무선 통합 (Fixed Mobile Convergence) 및 NGN Security 구조 등의 표준화 동향에 대하여 기술한다.
김양중(Kim, Yang-Jung),김선우(Kim, Sun-Woo),김용남(Kim, Yong-Nam) 대한건축학회 2020 대한건축학회 학술발표대회 논문집 Vol.40 No.1
The purpose of this study was to analyze the strengthening efficiency of stainless helical pin for external cray brick wall through the pull out test, and suggest proper distance of helical pin. This study was to draw the optimal conclusion by comparing the results of indoor experimental strength test and the field strength test at the old building that have passed 15 years of age and the performance test report of the UK. The results of this study confirmed the strengthening performance of the helical pin. In the case of the ∅9mm helical pin, the appropriate distance is @85cm in the case of cement brick wall base, and @90cm in the case of concrete wall base. However, continuous research is required on the improvement of the stiffness of 0.5B cement brick wall and the stiffness reduction of the base wall due to old age.
기존건축물의 외부치장적벽돌 보강설계 요소의 실험적 연구 - 줄눈모르타르의 강도 중심으로 -
김양중(Kim, Yang-Jung),김선우(Kim, Sun-Woo),김용남(Kim, Yong-Nam) 대한건축학회 2020 대한건축학회 학술발표대회 논문집 Vol.40 No.1
The purpose of this study is to suggest a method to detect the degree of oldness of joint mortar in advance when reinforcing the wall of the old buildings, to present basic data of the reinforcement design by deriving the correlation with the experimental result value by the experiment, and to present the standard of the reinforcement design of the wall of the existing buildings. The shear (attachment) strength test of the horizontal joint mortar at the site 15 years old showed 853N, and the strength degradation of 24.78% was observed compared to the use of the new constructed building. This may be a problem at the time of construction in the past, or it may be a decrease in strength due to rapid neutralization of mortar, so it is necessary to grasp the tendency through additional field confirmation.
자가근막이완운동과 스포츠마사지가 남자 대학생의 운동수행력 및 피로회복에 미치는 영향
김양중 ( Yang-jung Kim ),이상현 ( Sang-hyun Lee ),김수진 ( Su-jin Kim ),곽효범 ( Hyo-bum Kwak ),강주희 ( Ju-hee Kang ),박동호 ( Dong-ho Park ) 한국운동생리학회(구 한국운동과학회) 2017 운동과학 Vol.26 No.3
PURPOSE: The purpose of this study was to investigate the effects of self-myofascial release exercise (SMR) and sports massage (SM) treatment on exercise performance and fatigue recovery in male college students. METHODS: Twelve male college students (23.41±1.24 years, 174.33±6.75 cm, 71.57±9.63 kg, 17.01±6.48% fat) participated in the study. Subjects were randomly assigned to either an experimental treatment (SMR or SM) or control (CON). All subjects were performed with 1st treatment (CON, SMR, SM) for 10 minutes in the lower limbs before isokinetic exercise and Wingate test. After 1st treatment, Wingate test was performed for 30 seconds after performing isokinetic exercise at 240°/sec left and right 28 times. After isokinetic exercise and Wingate test (All-out), 2nd treatment was performed for 10 minutes. In order to analyze creatine kinase (CK) and lactate, blood was collected and measured 9 times in total. RESULTS: There was no significant difference in the left and right endurance, maximal power, and total workload of the extension and flexor muscles measured by isokinetic exercise. In addition, there was no significant difference in the mean power (p=.116), maximum power (p=.214), fatigue index (p=.236), and total workload (p=.108) during Wingate test. In the case of CK and lactate levels, there was also no significant difference in treatment (CON, SMR, SM) and interaction effect except over time (p=.000, p=.000 respectively). CONCLUSIONS: In conclusion, it seems that fatigue recovery and exercise performance are not affected by self-myopia relaxation exercise and sports massage treatment for 10-minute before and after exercise.
모바일 P2P 스트리밍 서비스를 위한 포인트 기반 자원 배분 기법과 그 특성
김양중(Yangjung Kim),정일영(Ilyoung Chong),한치문(Chimoon Han) 대한전자공학회 2013 전자공학회논문지 Vol.50 No.6
오늘날 P2P는 초기의 단순한 파일 공유에 사용되었던 제한성을 벗어나, 현재는 새로운 서비스를 제공하기 위해 네트워크 인프라를 추가적으로 구축하는 비용과 서버의 부담을 분산시키고 다른 연계 기술들과의 효율성을 극대화하는데 필수적인 기술이 되었다. 특히나 P2P를 이용한 미디어 스트리밍 서비스는 이용자에게 매우 매력적인 서비스로, 고사양의 모바일 단말과 모바일 네트워크 기술의 발달에 힘입어 점차 모바일 환경에서 유선망의 서비스 품질을 요구하고 있다. 하지만 P2P가 갖고 있는 고질적인 ‘Peer Selfishness’와 QoE사이의 접점을 찾기 위해서는 여전히 ‘공정성’을 고려해야 될 것이며 P2P 시스템은 반드시 이를 고려한 인센티브 메커니즘을 통해 자원 이용률을 최대화하고 이용자의 지속적인 기여를 통해 시스템의 전체적인 성능을 향상시켜야 한다. 따라서 본 논문에서는 공정성을 고려한 인센티브 메커니즘으로써 포인트 기반의 자원 할당 메커니즘을 제안하며 추가적으로 모바일 단말의 가용 에너지를 고려한 피어 선택 메커니즘을 설명한다. 이를 통해, 모바일 P2P 스트리밍 시스템에 제안하는 기법들이 적용됨으로써, 인센티브를 가진 경쟁 노드들이 자원할당을 위해 경쟁 시에 소스노드의 자원을 기여도와 에너지에 따른 자원분배를 이룸으로 시스템의 성능이 향상됨을 보인다. In the early stage of P2P, the technology was limited to narrow usage of file sharing, but currently, P2P technology has become essential to maximize the efficiency between associated technologies without additional deployment of high costly infrastructure and also the burden of the server. Especially, P2P media streaming service is a highly attractive service to mobile users. which requires a higher quality in the mobile environment in accordance with the development of technology of wired network as well as better mobile terminals. However, P2P technology should consider the trade-off between ‘peer selfishness’ and QoE for providing fairness. The P2P system also try to maximize the resource utilization through an incentive mechanism for service differentiation and encourage peers to contribute continuously for improving the overall system performance. In this paper, we propose an point-based incentive mechanism based on peer’s contribution level and energy availability for service differentiation. We also introduce that the proposed mechanism efficiently enhances the system performance as the peer with incentive using contribution and energy obtains more effective resource distribution.