IMS 기반 차세대 통신 환경에서 서비스 연속성을 위한 서비스 세션제어 기법

남승민,김지호,이현정,송오영,Nam, Seung-Min,Kim, Ji-Ho,Lee, Hyun-Jeong,Song, Oh-Young 한국정보처리학회 2009 정보처리학회논문지 C : 정보통신,정보보안 Vol.16 No.1

최근 디지털 정보통신 기술의 발전으로 네트워크 기술 및 성능의 적용 범위가 모든 분야로 확대됨에 따라 모든 정보단말, 가전기기, 사물 등이 하나의 네트워크로 연결되는 차세대 통신환경으로 진화되고 있다. 이러한 차세대 통신 환경에서의 핵심기술인 IMS(IP Multimedia Subsystem) 기반 네트워크에서 원활한 통합서비스(convergence service)의 제공을 위해서는 사용하던 정보단말이 바뀌거나 네트워크가 변화하더라도 이용 받던 서비스들을 그대로 제공 받을 수 있는 끊김없는(seamless) 서비스가 가능하여야 한다. 본 논문은 IMS Enabler를 통한 통합서비스 제공환경에서 사용자의 네트워크 환경의 변화나 정보단말의 변화에도 끊김없는 서비스를 제공하기 위한 세션제어기법과 그 구조를 제안하고 그에 따른 서비스 세션 제어 프로토콜(Service Session Control Protocol : SSCP)을 제시한다. Recently, the application of network technology extends to all areas because of development of digital information technology. Thus, networks are being evolved towards a next-generation communication environments where all information devices, home appliances, and object are connected and interoperated. In order to provide adequate convergence services in IMS-based networks that are the core technology of the next-generation communication environments, seamless service should be possible although the underlying network and the device in use may change in the networks. In this paper, we propose an efficient architecture, algorithm, and protocol of service session control for seamless service in such networks.

오타고 운동프로그램이 낙상 경험 노인의 신체기능 및 낙상 위험도에 미치는 영향

남승민(Seung-Min Nam),나상수(Sang-Soo Na),이도연(Do-Youn Lee) 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.9

본 연구는 오타고 운동프로그램이 낙상 경험 노인의 신체기능 및 낙상 위험도에 미치는 영향을 알아보고자 실시하였다. 낙상을 1회 이상 경험한 노인 36명을 대상으로 각각 오타고 운동프로그램 집단(실험군)과 일반적인 균형훈련집단(대조군)으로 무작위 분류하였다. 각 집단은 30분씩 주 3회, 총 8주 동안 운동을 실시하였다. 낙상의 위험성을 평가하기 위해 Tetrax를 사용하여 측정하였다. 또한, 신체기능의 측정을 위해 정적균형은 Biorescue, 동적균형은 TUG, 보행능력은 10MWT, 하지근력은 FTSST를 이용하여 측정하였다. 각 그룹 내 운동 전․후 차이를 검증하기 위하여 대응표본 t-검정(Paired T-test)을 실시하였고, 그룹 간의 비교를 위하여 독립표본 t-검정(Independent Sample T-test)을 실시하였다. 실험결과, 실험군, 대조군 모두 정적균형능력 및 동적균형능력은 운동 후 유의하게 증가하였으며, 낙상의 위험성은 감소하였다(p<.05). 하지근력 및 보행능력은 실험군에서만 운동 후 유의하게 증가하였다(p<.05). 본 연구의 결과를 종합해보면, 오타고 운동프로그램은 낙상 경험 노인의 신체기능 증진 및 낙상의 위험성이 감소에 효과적이라는 것을 알 수 있었다. The purpose of this study was to investigate the effects of the Otago exercise program on physical function and risk of falling in elderly who have experienced falls. Thirty-six elderly people who had experienced falls more than once were randomly classified into an experimental group and control group. Each group exercised 30 minutes three times per week for a total of 8 weeks. Measurements were made using Tetrax to assess risk of falls. In addition, to measure physical function, static balance was measured using Biorescue, dynamic balance was measured using TUG, walking ability was measured using 10 MWT, and lower extremity strength was measured using FTSST. A paired t-test was conducted to verify the difference between before and after exercise in each group, and an independent t-test was performed for comparison between the groups. Regarding the experimental and control groups, static balance ability and dynamic balance ability increased significantly after exercise, and risk of falls decreased (p<.05). Lower extremity strength and gait ability increased significantly after exercise only in the experimental group (p<.05). Based on these results, the Otago exercise program is effective in improving physical function and reducing risk of falls in elderly people who have experienced falls.

작은가슴근 자가 신장운동이 정상 성인의 작은가슴근 길이와 봉우리-위팔 거리에 미치는 즉각적인 효과

남승민(Seung-Min Nam),김경(Kyoung Kim),이인규(In-Gyu Lee),이도연(Do-Youn Lee) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.7

어깨관절 통증은 성인의 약 20% 정도가 일생에 한 번 이상 경험하는 매우 흔한 근골격계 질환이다. 이에 본 연구에서는 작은가슴근 신장운동에 의해 어깨뼈봉우리 밑 공간이 증가하여 충돌증후군 및 어깨통증에 긍정적인 효과가 있다는 객관적 평가를 실시하고, 작은가슴근 자가 신장운동이 도수 신장운동과 비교하여 작은가슴근의 길이와 봉우리 위팔 거리에 미치는 영향을 알아보고자 실시하였다. 경상북도 소재의 대학교에서 성인 남녀 30명을 대상으로 하여 대상자가 스스로 작은가슴근 자가 신장운동을 실시하는 실험군 15명과 치료사에 의해 수행되는 작은가슴근 도수 신장운동을 적용한 대조군 15명으로 두 그룹을 무작위 배치하여 치료의 즉각적인 효과를 비교하였다. 어깨뼈봉우리 위팔 거리를 측정하기 위해 초음파 장비를 사용하였고, 작은가슴근 길이를 측정하기 위해 4번째 늑골과 복장뼈가 만나는 부위 그리고 오훼돌기 아래측면 사이의 거리를 재었다.. 연구결과 실험군과 대조군 모두 그룹 내에서 작은가슴근의 길이와 봉우리 위팔 거리 모두 유의하게 증가되었고(p<.05), 그룹 간 비교에서는 통계학적으로 유의한 차이가 나타나지 않았다(p>.05). 이러한 결과는 작은가슴근의 자가 신장운동이 충돌증후군 및 어깨질환의 예방 및 치료에 효율적인 운동방법으로 제시될 수 있다고 사료된다. Shoulder joint pain is a very common musculoskeletal disorder, in which about 20 percent of adults experience it more than once in their lives. In this study, an objective assessment was made that subacromial space was increased by pectoralis minor stretching exercise, which has a positive effect on impingement syndrome and shoulder pain. Also, This study examined the effects on pectoralis minor length(PML) and acromio-humeral distance(AHD) following pectoralis minor self-stretching exercise in normal adults. In this study, a total of 30 subjects were recruited and randomly divided into a self-stretching exercise group(n=15) and manual stretching exercise group(n=15) to compare theimmediate effecs of treatment. Studies have shown that both groups have significantly increased both PML and AHD within the group(p<.05). There was no statistically significant difference in the comparison between the groups(p>.05). The results suggest that self-stretching exercise can be recommended as a treatment method for impingement syndrome and prevention of shoulder disease.

능동이완기법과 허리안정화 운동이 만성허리통증 환자의 골반비대칭, 근활성도 및 통증에 미치는 영향

남승민 ( Nam Seungmin ) 대한통합의학회 2020 대한통합의학회지 Vol.8 No.1

Purpose : The purpose of this study was to investigate the effects of active release technique and lumbar stabilization exercise on pelvic asymmetry, muscle activation and pain in chronic low back pain patients. Methods : The subjects were 37 outpatients diagnosed with chronic low back pain. The patients were randomly divided into an active release technique therapy group (ART; n=18), and lumbar stabilization exercise group (LSE; n=19). These groups performed their respective therapy for a 30-minute session occurring two times a week over six-weeks period. To assess the patients’ pelvic asymmetry, their pelvic tilt, and pelvic rotation was measured using X-ray imaging. EMG was used to evaluate the muscle activity of the lumbar muscle. The visual analogue scale (VAS) were used to measure the subjects’ pain. Results : Both ART group, and LSE group exhibited statistically significant differences in their subjects’ VAS and muscle activation of lumbar muscle after the therapy (p<.05). In ART group exhibited statistically significant decreases in their subjects’ pelvic tilt and pelvic rotation after therapy (p<.05). There was a significant difference between the ART group, and LSE group (p<.05). Conclusion : The results of this study suggest that active release technique and lumbar stabilization exercise are effective in decrease pain and increase muscle activation in chronic low back pain patient. In addition active release technique is considered to be more effective in improving pelvic tilt and pelvic rotation than lumbar stabilization exercise

방한 중국인 관광객의 태도, 주관적 규범, 인지된 행동통제, 기대된 감정이 관광열망에 미치는 영향 관계 연구

남승민(Nam, Seungmin),신홍철(Shin, Hong-Chul) 한국관광레저학회 2018 관광레저연구 Vol.30 No.10

시각적 피드백을 이용한 닫힌 사슬 운동이 만성 발목 불안정성 성인남성의 하지 근활성도 및 발목 불안정성 지수에 미치는 영향

남승민 ( Seung-min Nam ),이도연 ( Do-youn Lee ) 대한물리의학회 2019 대한물리의학회지 Vol.14 No.1

PURPOSE: This study examined the effects on muscle activation and ankle instability following sudden ankle inversion of the closed kinetic chain exercise using visual feedback to evaluate chronic ankle instability in adult males. METHODS: In this study, 28 subjects with chronic ankle instability were recruited and randomly divided into a closed kinetic chain exercise using a visual feedback group(n=13) and an open kinetic chain exercise group(n=15). Each group underwent 30 minutes of exercise three times a week for 8 weeks. The electromyographic(EMG) values of the rectus femoris, biceps femoris, tibialis anterior, peroneus longus, peroneus brevis, and lateral gastrocnemius muscles were measured to analyze muscle activity. The Cumberland ankle instability tool(CAIT) was used to measure ankle instability. RESULTS: Both groups showed improvements in tibialis anterior, peroneus longus and CAIT score(p<.05). In the experimental group, there were significant improvements in the rectus femoris, biceps femoris, and lateral gastrocnemius muscle activation(p<.05). CONCLUSION: The results suggest that closed kinetic chain exercise using visual feedback can be a useful treatment method for patients with chronic ankle instability.

35kW급 수소연료전지 차량용 단일 전력단 절연형 DC-DC 컨버터 설계

남승민(Seung-Min Nam),최재혁(Jae-Hyuck Choi),공소정(So-Jeong Kong),김진수(Jin-Su Kim),이준영(Jun-Young Lee) 전력전자학회 2023 전력전자학술대회 논문집 Vol.2023 No.7

다차원척도법을 이용한 도시 브랜드 이미지 포지셔닝 연구

남승민(Seung Min Nam),문희정(Hee Jeong Moon),김영미(Young Mi Kim),신홍철(Hong Chul Shin) 한국관광연구학회 2013 관광연구저널 Vol.27 No.6

The purpose of this study is that to derive the attributes to represent the brand image of the korea city brand from the previous research and major cities in South Korea intended for Chinese tourists is analyzed by positioning map using multidimensional scaling. The results provide strategies and measures that can improve the satisfaction level from Chinese tourist of South Korea. Korea City brand of group, a total of four is a bond of similarity as following. 1st group: Jeju, Jeonju, 2nd group: Seoul, Busan, 3rd group: Incheon, 4th group: Pyeongchang, Sokcho, Chuncheon, and Geoje divided race by Euclidean Dian distance. The limitations of this study is that survey place is limited space of Seoul, so there may be difficult to generalize of chinese tourist of South Korea. In future research, it also means that you try to research to investigate separately tourists by Seoul, Busan, and Jeju.

자연환경해설사 양성교육과정 중요도-성취도(Importance-Performance Analysis) 분석 연구

남승민(Seung-min Nam),허학영(Hak-young Heo),심규원(Kyu-won Sim) 국립공원연구원 2021 국립공원연구지 Vol.12 No.1

본 연구는 중요도-성취도 분석(Importance-Performance Analysis)을 통해 자연환경해설사 양성교육 커리큘럼을 진단, 문제점을 조사 및 분석하여 제도 발전방안을 제시하는데 있다. 분석 결과, 기본과정의 경우 생물자원의 이해, 지형 및 지질 환경의 이해, 보호지역의 이해 등 해설의 기본이 되는 과목이 ‘저순위’로 도출된 것으로 볼 때 기본수업은 온라인 수업 등의 방법을 통해 선택과 집중이 필요하겠다. 또한 간이과정의 경우 해설기법과 시연, 자연환경해설사의 역할, 안전관리 및 응급처치 과목 등의 실무적인 과목의 지속적인 수요가 있으며, 전문과정의 경우 ‘저순위’ 영역의 과목들인 해설프로그램 평가, 지속가능한발전, 환경교육프로그램 인증 실습 등의 과목은 시대적 흐름에 따른 과목으로써 트랜드에 맞춰 수정될 수 있다. 즉, 다양한 교육과정을 나열하여 공통과목과 선택과목으로 분리하여 개인의 성향, 전공분야에 따라 취사선택할 수 있는 방법을 도입할 필요가 있으며 온라인 과목과 오프라인 과목의 분리, 실무적인 과목을 위주로 오프라인 수업을 진행하는 것을 제안한다. It is necessary to investigate the training curriculum and analyze problems through importance-performance analysis to suggest ways to develop the system. The survey was conducted online 1:1 through in-house mail within the industrial complex, and the results were as follows. Basic subjects such as understanding biological resources, the terrain and geological environment, and protected areas were derived as ‘low priority’, so fundamental subjects need to be selected through online classes. In addition, there is a continuous demand for practical subjects such as interpreter techniques and demonstrations, role of interpreter, safety management and first aid, and in specialized courses, subjects such as ‘low priority’ program evaluation, sustainable development, and environmental education program certification can be modified according to trend. In other words, it is necessary to list various curriculum and introduce a method to select subject according to individual s tendency and major field, and it is better to conduct offline classes focusing on online and offline subjects.

DEA 기법을 활용한 국내 저가 항공사 경영 효율성 분석 연구

남승민(Nam Seung-min),손미혜(Son Mi-hye),신홍철(Shin Hong-chul) 한국호텔관광학회 2016 호텔관광연구 Vol.18 No.2

The purposes of this study were to distinguish between the efficient Low cost carrier and inefficient Low cost carrier of South Korea by applying Data Envelopment Analysis (DEA) to determine the efficiency of the operation and provide suggestions vehicle for identifying better benchmarks of inefficient Low cost carrier. This study aims to provide suggestions and directions of how to enhance the efficiency of the inefficient airlines. To this end, DEA was employed to analyze the efficiency of Low Cost Carrier in South Korea. The empirical results indicate that by using CCR model, 3 Airlines(Jeju airline, air busan, Jin-air) show relatively high efficiency which implies the total effectiveness of the operation. The CCR model implies that the group of inefficient low cost carriers’ should reduce their cost of sales and sales goods & administration(SG &A) expense based on the numerical figure of the potential improvement. Specifically, inefficient group should reduce 89.5% of Cost of Sales, 10.5% of SG &A expense in order to perform efficiently. This study has its significance in applying DEA method to measure the productivity of each airline in order to help identify problems of the airlines and suggest better ways of operation. Based on the results, some managerial implications can be helpful insights to operators and investors of Airlines. For further research, applying DEA method to analyze other countries’ low cost carrier using various inputs might be considered upon data availability.