FDB 설계의 신뢰성 평가를 위한 형상 Modeling의 자동화

권정민(Jeong-min Kwon),김희석(Hee-seok Kim),구자춘(J. C. Koo) 한국소음진동공학회 2003 한국소음진동공학회 학술대회논문집 Vol.2003 No.11

맵리듀스를 이용한 SE Matching 기반 유사 검색 기법

권정민 ( Jeong-min Kwon ),서준일 ( Jun-il Seo ),안진우 ( Jin-woo An ),이정준 ( Jeong-joon Lee ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.1

시계열 데이터 검색은 금융, 생명정보 등 많은 분야에서 요구되는 주요한 기술로서 연구되어 왔다. 특히 기존에 제안된 스케일링(Scaling)과 쉬프팅(Shifting)을 이용한 검색인 SE Match는 유사 서브시퀀스를 효과적으로 찾아내는 방법으로 알려지고 있다. 본 논문에서는 이 방법에 맵리듀스를 적용하는 MRSE-검색 (MapReduce-based Searching with Shift-Eliminated)방법을 제안한다. 본 논문이 제안하는 방법으로 분산처리를 통하여 응답시간의 개선과 대용량의 시계열 데이터에서 효율적인 검색이 가능 할 것으로 사료된다.

계층적 계획프로세스를 이용한 공기지연 분석방법

권정민(Kwon Jeong-Min),이재섭(Lee Jae-Seob) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.8

In construction delay claims, one party should prove the fact that the other party is responsable for the schedule delay caused to loss. Previous researches on construction delay analysis have been focused on methodologies of schedule impact analysis. The research on the practical method to apply the methodologies to actual project CPM network has not relatively been done yet. It is necessary to breakdown the level of project schedule and insert delay activities to analyze the schedule delay on the actual complex construction project CPM network. This paper presents a construction delay analysis method by means of hierarchical planning process approach to analyze the schedule delay and to present a method for calculating activity delays on the actual construction project CPM network.

국한성 맥락막혈관종에서 발생한 장액망막박리에 대한 치료결과

권정민(Jeong Min Kwon),이승민(Seung Min Lee),권한조(Han Jo Kwon),박성후(Sung Who Park),이지은(Ji Eun Lee),변익수(Ik Soo Byon) 대한안과학회 2017 대한안과학회지 Vol.58 No.3

목적: 장액망막박리가 발생한 국한성 맥락막혈관종에서 항혈관내피성장인자 주사와 광역학치료 결과를 알아보고자 하였다. 대상과 방법: 국한성 맥락막혈관종 환자 중에서 황반부 장액망막박리가 발생하여 치료가 필요했던 환자들의 치료방법과 결과를 의무기록을 통해 후향적으로 조사하였다. 종양의 진단과 치료경과는 안저사진, 인도사이아닌그린 혈관조영술, 빛간섭단층촬영, 안초음파 검사를 시행하여 분석하였다. 결과: 총 9명 9안을 치료 후 평균 19.2개월 동안 경과관찰하였다. 평균 시력은 0.51 ± 0.52 (logMAR), 종양의 최대지름은 평균 6,154.4 ± 2,019.9 μm, 두께는 평균 2,224.4 ± 862.1 μm였다. 첫 치료로 항혈관내피성장인자 유리체내주사를 받은 6안 중 5안은 평균 3.16회의 치료에 반응이 없거나 재발하여, 추가적인 광역학치료와 경동공온열치료가 필요하였다. 광역학치료를 받은 3안은 평균 1.3회의 치료 후 망막내/하액이 소실되고 재발은 없었다. 최종적으로 8안에서 완전한 망막내/하액의 소실을 얻을 수 있었으나, 평균시력은 치료 전과 차이가 없었다. 결론: 국한성 맥락막혈관종에서 발생한 장액망막박리에 대하여 항혈관내피성장인자 유리체내주사의 효과는 제한적이었으며, 광역학 치료가 적은 치료횟수로 망막하액의 소실을 얻을 수 있었다. Purpose: To determine the clinical outcome of anti-vascular endothelial growth factor (anti-VEGF) and photodynamic therapy (PDT) for circumscribed choroidal hemangioma (CCH) with serous retinal detachment. Methods: The medical records of patients having CCH with serous retinal detachment in macula were retrospectively reviewed. CCH and serous retinal detachment were evaluated via fundus photography, optical coherence tomography, indocyanine green angiography, and ultrasonography. Results: A total of 9 eyes were enrolled in this study. The average follow-up period was 19.2 months. The mean visual acuity was 0.51 ± 0.52 (logMAR) and the mean maximum diameter and thickness of the tumor were 6,154.4 ± 2,019.9 μm and 2,224.4 ± 862.1 μm, respectively. Of the 6 eyes receiving anti-VEGF (mean number of injections: 3.16) as the first treatment for serous retinal detachment, 5 had sustained or recurred intraretinal/subretinal fluid (IRF/SRF) and needed additional PDT and transpupillary thermotherapy. In the 3 eyes that received PDT (mean number of treatments: 1.3) as an initial treatment, IRF/SRF was completely resolved. Finally, 8 eyes achieved complete resolution of SRF and IRF; however visual recovery was limited. Conclusions: PDT, even with a small number of treatments, can alleviate IRF/SRF in CCH, while anti-VEGF did not.

태권도 수련이 비만 여아의 신체구성과 체력 및 성조숙증 위험인자에 미치는 영향

정민기 ( Min Ki Jeong ),권유찬 ( Yoo Chan Kwon ),박상갑 ( Sang Kab Park ),김은희 ( Eun Hee Kim ),박종환 ( Jong Hwan Park ) 대한무도학회 2014 대한무도학회지 Vol.16 No.1

이 연구의 목적은 비만 여아를 대상으로 12주간의 태권도 수련을 통해 신체구성과 체력 및 성조숙증과 밀접한 관련이 있는 위험인자에 미치는 영향을 분석하여 건강증진과 성조숙증의 예방을 위한 태권도 수련의 효과를 제시하는 데 있다. BMI 백분위수 95 이상이면서 Tanner stage 1에 해당되는 7~8세의 비만 여아를 대상으로 신체구성과 혈압을 측정하였으며, 체력측정은 2007 국민체력실태조사(문화체육관광부, 2008)의 기준에 따라 실시하였다. 그리고 자전거에르고미터를 이용하여 최대산소섭취량을 측정하였고, 프로그램 실시 전과 12주 후 혈액분석을 실시하였다. 또한 태권도 수련을 1회 60분, 주 3회, 12주간 실시하여 신체구성과 체력 및 성조숙증 위험인자에 미치는 영향에 대하여다음과 같은 결과를 얻었다. 태권도 수련군에서 신장이 유의하게 증가하였으며 체질량지수, 체지방률이 유의하게 감소한 것으로 나타나 신체구성의 개선에 긍정적인 효과가 나타났으며 체력에서도악력, 앉아 윗몸 앞으로 굽히기, 사이드스텝, 눈감고 외발서기, 최대산소섭취량, 체중당 최대산소섭취량이 유의하게 개선되어 비만 여아의 체력수준이 높아진 것으로 나타났다. 또한 혈중 지질 및 성조숙증 위험인자의 변화에서는 leptin, TG, TC, LDL-C에서 그룹과 시기 간의 상호작용에서 유의한 차이가 나타났다. 이상의 결과를 종합하여 볼 때 비만 여아에 있어서 12주간의 태권도 수련은 신체조성과 체력의 개선 및 혈중 지질에 긍정적인 영향을 주어 비만으로 인해 발생될 수 있는 각종 생활습관병의 예방에 긍정적인 영향을 줄 뿐만 아니라, 성조숙증과 밀접한 관련이 있는 위험인자의 개선에도 긍정적인 영향을 줄 수 있는 운동방법이라 생각된다. The purpose of this study was to investigate the effects of Taekwondo training on body composition, physical fitness and precocious puberty risk factors in infantile obesity girls. Subjects consisted of over BMI 95 percentile and applicable Tanner stage 1 and obesity symptom 7-8 years girls. Taekwondo training program consisted of 60 minutes, 3 times a week for 12 weeks. The results of this study were in body composition, body weight(p<.05), body mass index(p<.01) and percent body fat(p<.001) had a statistically significant after Taekwondo program. In physical fitness, grip strength(p<.05), trunk flexion in sitting position(p<.05), side step(p<.001), close eye one leg standing(p<.05) and V.O2max(p<.05) had a statistically significant after Taekwondo program. In precocious puberty risk factors and serum lipids, leptin(p<.01), triglyceride(p<.05), total cholesterol(p<.05) and LDL cholesterol(p<.001) had a statistically significant after Taekwondo program. Therefore, the results of this study demonstrated that Taekwondo program may be an effective intervention strategy for improving body composition, physical fitness, blood lipids and precocious puberty risk factors, leading to improved lifestyle-related diseases prevention in obese girls.

An Improved Backoff Algorithm for the Random Access Protocol for the Ranging Subchannel of IEEE 802.16 Networks

권정민(Jeong-Min Kwon),이형우(Hyong-Woo Lee),조충호(Choong-Ho Cho) 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.12A

본 논문은 IEEE 802.16 환경의 레인징 부채널에서 사용된 OFDMA/CDMA slotted ALOHA의 랜덤 재전송의 개선된 backoff 알고리즘을 제안한다. IEEE 802.16 환경에서 기지국은 UL-/DL-MAP을 이용하여 채널 접속을 조정한다는 사실을 활용하여, 본 논문은 처리량 증가, 지연의 편차 감소 그리고 랜덤액세스 프로토콜의 과부하 조건에서 성능 감소율 향상을 위해 현재의 IEEE 802.16 환경을 약간 수정하는 방안을 제안한다. 이 알고리즘은 기본적으로 BS가 충돌이 발생한 단말들의 재전송 확률을 계산하기 위해 backlogged 사용자 수와 arrival rate를 예측한다. 컴퓨터 시뮬레이션은 제안한 알고리즘의 효과를 증명하고 Binary Exponential Backoff 알고리즘과 성능 비교를 위해 수행되었다. An improved backoff algorithm for retransmission randomization for OFDMA/CDMA/slotted ALOHA used in the ranging subchannel of IEEE 802.16 network is proposed. Exploiting the fact that a base station coordinates channel access using UL-/DL-MAP in the IEEE 802.16 networks, we propose a minor modification of the existing IEEE 802.16 in order to increase throughput, decrease delay variation and achieve a graceful performance degradation in case of overload channel condition of the random access protocol. The algorithm basically estimates the number of backlogged users and arrival rate using which, the BS calculates retransmission probability for the subscriber stations involved in a collision. Computer simulation is performed to demonstrate the effectiveness of the proposed algorithm and to compare the performance with existing binary exponential backoff algorithm.

장기간의 태권체조와 세라밴드 운동이 비만고령여성의 자립생활체력 및 hs-CRP 농도에 미치는 영향

정민기(Jeong, Min-Ki),박현태(Park, Hyun-Tae),박상갑(Park, Sang-Kab),김은희(Kim, Eun-Hee),권유찬(Kwon, Yoo-Chan) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.3

The purpose of this study was to investigate the effects of 24-week Takwondo aerobic and Thera-band on self-reliance physical fitness and hs-CRP concentration in obese elderly women. We recruited 20 elderly women with obese : a exercise group (n=10) and control group(n =10). The frequency of exercise for the group was 3 times per week (i.e., Monday, Wednesday, and Friday) for 24 weeks. Each 60-minute exercise programme included 10 minutes of warm-up activities and 5 minutes of cool-down activities. The results of this study showed that combined exercise improves body composition after 24 weeks. Self-reliance physical fitness was significantly increase than baseline values in the combined exercise group. The risk factor of Cardiovascular disease were significantly increase than baseline values in the combined exercise group. Our findings demonstration that a 24-week combined exercise programme may be an effective intervention strategy for improving body composition, self-reliance and risk factor of cardiovascular disease in obese elderly women.

중학생들의 인터넷 중독 위험수준에 따른 신체활동량과 비만도의 관련성

정민기(Jeong, Min-Ki),김권민(Kim, Gwon-Min),권유찬(Kwon, Yoo-Chan) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.4

The purpose of this study was to examine the association perceived physical activity pattern and body mass index according to habitual internet usage among middle school student. Data were analyzed for 969 students who responded to self-reported base cross-sectional survey relating to socio-demographic variables, internet usage status, and a short version of the international physical activity questionnaire. Prevalence rate of physical activity status showed that 53.5% at 150 min/week under, 46.5% at 150min/week over. Prevalence rate of internet usage showed that 95.6% at normal group, 2.6% at potential group, 1,9% at addiction group. Prevalence rate of body mass index status of over weight according to internet usage status shoed that 83.1% at normal, 5.1% at potential, 11.9% at addiction. Prevalence rate of physical activity levels of 150 min/week under according to internet usage status showed that 93.8% at normal, 3.5% at potential, 2.7% at addiction. In comparison with the physical activity levels was significantly more likely potential internet usage (OR, 2.62; 95% confidence interval [95%CI], 1.09-6.47; p〈.05) and addiction usage (OR, 3.82; 95% confidence interval [95%CI], 1.24-11.75; p〈.05). The results revealed that physical activity levels and body mass index correlates of internet usage status. This finding suggest the necessity of developing specific strategies for physical activity intervention by internet addiction among middle school students.

장기간 복합운동이 내장지방형 중년남성의 체력 및 중심동요에 미치는 영향

정민기(Jeong, Min-ki),박상갑(Park, Sang-Kab),김은희(Kim, Eun-Hee),박종환(Park, Jong-Hwan),권유찬(Kwon, Yoo-Chan) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.6

The purpose of this study was to investigate the effects of 32-week combined exercise on physical fitness and center of pressure in middle-age men with visceral obesity. We recruited 24 middle-aged men (age range, 40 - 50 years) with visceral obesity: a combined group (n=12) and control group (n=12). Visceral fat was defined as an abdominal visceral-to-subcutaneous fat. The frequency of exercise for the combined (i.e., yoga, resistance, aerobic, and balance exercises) group was 3 times per week (i.e., Monday, Wednesday, and Friday) for 32 weeks. Each 60-minute exercise programme included 10minutes of warm-up activities and 10 minutes of cool-down activities. The results of this study showed that combined exercise improves body composition, subcutaneous fat and visceral fat after 32 weeks. Physical fitness was significantly increase than baseline values in the combined group. Anteroposterior range of center of pressure and mediolateral range of center of pressure were significantly decrease than baseline values in combined group after 32 weeks. Our findings demonstrate that a 32-week combined exercise programme such as yoga, resistance, aerobic, and balance may be an effective intervention strategy for improving abdominal fat, physical fitness and center of pressure leading to improved quality of life in middle-aged men with visceral obesity.

대학생들의 주별 신체활동량에 따른 건강관련 체력 및 우울 수준의 관계

정민기(Jeong, Min-Ki),김권민(Kim, Gwon-Min),권유찬(Kwon, Yoo-Chan) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.4

The purpose of this study was to examine the association perceived health-related physical fitness and depressive levels according to weekly physical activity pattern among university students. Data were analyzed for 132 students who responded to self-reported base cross-sectional survey relating to socio-demographic variables, depressive assessment, short version of the IPAQ and a health-related physical fitness test. Prevalence rate of CES-D score of 21 more than according to weekly physical activity status showed that 73.9% at IAG, 26.1% at SAG. Prevalence rate of 20m shuttle run of average or over according to weekly physical activity status showed that 41.6% at IAG, 58.4% at SAG. In comparison with the cardiorespiratory endurance was significantly less likely SAG (multi-adjust model: OR, 0.22; 95% confidence interval [95% CI], 0.90-0.53; p<.05). In comparison with the depressive levels was significantly more likely SAG (multi-adjust model: OR, 3.68; 95% confidence interval [95% CI], 1.10-12.26; p<.05). The results revealed that health-related physical fitness and depressive levels correlates of weekly physical activity pattern. This finding suggest the necessity of developing specific strategies for physical activity intervention by health-related physical fitness and depressive among university students.