CORBA 기반의 분산 멀티미디어 서비스를 위한 관리시스템의 설계와 구현

공지영(Ji-Young Kong),홍원기(Won-Ki Hong),김동진(Dong-Jin Kim) 한국정보과학회 1999 정보과학회 컴퓨팅의 실제 논문지 Vol.5 No.5

최근 분산 멀티미디어 서비스들의 개발과 사용이 급격히 증가함에 따라 안정적이고 효율적인 분산 멀티미디어 서비스를 제공하기 위한 관리가 필요하게 되었다. 하지만 이러한 분산 멀티미디어 서비스들의 관리는 매우 복잡하고 다루기 힘든 것이어서 강력한 관리 시스템이 요구되어진다. 그래서 이 논문에서 CORBA 기반의 분산 멀티미디어 서비스를 위한 관리 시스템을 제안한다. 이 연구에서는 분산 멀티미디어 서비스를 모니터링하고 제어할 수 있는 관리 시스템의 구조와 다양한 관리 서비스를 개발하였다. 관리 시스템의 구조는 구성 관리나 결함 관리, 보안 관리나 사건 관리와 같은 서비스를 수행하는 객체들로 구성된다. 그리고 분산 멀티미디어 서비스를 위한 기본 관리 정보도 정의하였다. 뿐만 아니라 설계에 대한 검증으로 MAESTRO라 불리는 CORBA 기반의 분산 멀티미디어 시스템을 위한 웹 기반의 관리 시스템을 개발하였다. 개발된 시스템 또한 CORBA를 기반으로 하였으며 관리 서버와 웹 인터페이스 사이의 통신을 위해 OrbixWeb을 사용하였다. 이 시스템은 현재로는 분산 멀티미디어 서비스 관리를 위해 개발되었지만 CORBA를 기반으로 한 다른 분야의 서비스나 응용 프로그램의 관리에도 쉽게 적용될 수 있을 것이다. Recently, as the development and use of distributed multimedia services are growing explosively in every aspects of our lives, administrators of multimedia services are very concerned with providing users with reliable and efficient services. However, the management of distributed multimedia services is a very complex and troublesome work such that a flexible but powerful management system is necessary This paper proposes a management system for managing CORBA-based distributed multimedia services. We have developed an architecture {or the management system and defined a set of management services needed to monitor and control distributed multimedia services. The architecture consists of several objects, which perform configuration management, fault management, security management and event management. A generic distributed multimedia service (DMS) MIB has been defined for the management of various multimedia services and applications. In addition, as a proof of concept, we have developed a Web-based management system for a CORBA-based distributed multimedia system called MAESTRO. The prototype management system uses OrbixWeb to interface with the management server which is implemented as a set of CORBA objects Though our management system has been developed for distributed multimedia services, it can easily manage other CORBA-based services and applications.

분산 멀티미디어 응용 프로그램을 지원하기 위한 MAESTRO 통신 서비스

윤태형(Tae-Hyoung Yun),공지영(Ji-Young Kong),신영미(Young-Mi Shin),홍원기(Won-Ki Hong),서영호(Young-Ho Suh) 한국정보과학회 1998 정보과학회논문지 : 시스템 및 이론 Vol.25 No.7

멀티미디어 응용 프로그램은 네트워크의 속도가 증가함에 따라 점점 더 많이 사용되고 있으나 아직까지도 분산 멀티미디어 응용 프로그램을 개발하고 운용하기가 쉽지 않다. 이것은 대부분의 운영체제가 멀티미디어와 관련된 서비스를 제공하지 못하고 현재의 네트워크 기술이 멀티미디어 응용 프로그램들이 필요로 하는 다자간 통신, 실시간 처리, 미디어 동기화 등의 기능들을 제공하지 못하기 때문이다. 이러한 문제를 해결하기 위해서 MAESTRO라 불리는 객체 지향 분산 멀티미디어 시스템을 개발하였다. MAESTRO는 다양한 멀티미디어 응용 프로그램들을 지원하기 위해서 멀티미디어 API와 여러 분산 멀티미디어 서비스들을 제공한다. 이 논문은 MAESTRO가 제공하는 분산 멀티미디어 서비스들 중 통신 서비스에 대해서 설명한다. MAESTRO 통신 서비스는 객체 지향 방법론을 이용하여 디자인되었으며 프로토타입은 CORBA 상에서 구현되었다. 이 논문은 MAESTRO 통신 서비스를 이용하여 비디오/오디오 멀티캐스팅 도구와 화이트보드 등의 멀티미디어 응용 프로그램들이 쉽게 개발되고 운용될 수 있다는 것을 보여준다. As high-speed, broadband networks replace slower, narrowband networks, multimedia applications are more widely used today than ever before. Distributed multimedia applications are, however, very difficult to develop, operate and manage. This is because most conventional operating systems do not provide multimedia-related services and current networking technologies do not satisfy the requirements of various multimedia applications. In order to solve this problem, we have developed an object-oriented distributed multimedia system called MAESTRO. MAESTRO provides a rich multimedia API and distributed multimedia services such as communication service, name service, session service, storage/retrieval service and management service that can support a wide variety of multimedia applications. Among the distributed multimedia services, we present the design and implementation of the communication service that helps multimedia applications communicate each other efficiently and reliably. The communication service has been modeled using object-oriented methodology. The functionalities provided by the communication service include multi-point communication, flow control, reliable communication, and bandwidth control. As a proof of concept, we present how a prototype of communication service has been implemented using a CORBA distributed platform and how the distributed multimedia applications such as video/audio multicasting tool and whiteboard can be easily developed and efficiently operated using the communication service.

여성 노인의 근감소성 비만과 대사증후군 위험인자 간의 연관성 검증

이인환(In-Hwan Lee),공지영(Ji-Young Kong),진영윤(Young-Yun Jin),한진희(Jin-Hee Han),강현식(Hyun-Sik Kang) 한국생활환경학회 2017 한국생활환경학회지 Vol.24 No.2

This study examined the association with sarcopenic-obesity and metabolic syndrome risk factors in elderly women. This was a cross sectional study involving 261 elderly women (aged 74.0±6.9 years). Total body composition analysis was performed with a dual-energy X-ray absorptiometry (DXA). Measured metabolic risk factors included waist circumference (WC), triglyceride (TG), high density lipoprotein-cholesterol (HDL-C), fasting blood glucose (FBG), systolic (SBP) and diastolic blood pressure (DBP). Using the cut-off values of the Asian Working Group for Sarcopenia (AWGS) study and body mass index (BMI), subjects were classified as subgroups of normal, sarcopenia, obesity, and sarcopenic-obesity. One-way ANOVA followed by a LSD post-hoc test was used to compare any group differences in measured variables among the sarcopenic-obesity based subgroups. Logistic regression analyses were used to determine the odds ratio (OR) of sarcopenic-obesity status for having metabolic syndrome. There were significantly increases for WC, TG, SBP and decrease HDL-C across incremental sarcopenic-obesity status. Compared with the normal group (reference group, OR=1), the sarcopenia group (OR=2.53), obesity group (OR=3.99), and sarcopenic- obesity group (OR=5.56) had significantly higher ORs for having metabolic syndrome. The findings of this study suggested that healthy diet, and regular exercise should be promoted for sarcopenic-obesity that is important factor to prevent metabolic syndrome in elderly women.

여행업체의 지출예산 제약이 이윤효율에 미치는 영향

강상목(Kang, Sang-Mok),공지영(Kong, Ji-young),성신제(Sung, Sin-je) 한국관광레저학회 2015 관광레저연구 Vol.27 No.2

좌식습관과 신체활동 수준이 아동청소년의 척추 및 골반변형에 미치는 영향

송문구 ( Mun-ku Song ),공지영 ( Ji-young Kong ),박지현 ( Ji-hyun Park ),신철호 ( Chul-ho Shin ),강현식 ( Hyun-sik Kang ) 한국운동생리학회(구 한국운동과학회) 2017 운동과학 Vol.26 No.1

PURPOSE: This study investigated the association between the modifiable risk factors and spinal deformations in children. METHODS: Children (152 boys, 153 girls) were recruited to participate in the study. Physical activity level, sitting time, and posture were assessed with a questionnaire. Spinal parameters such as scoliosis angle (SA), pelvic oblique (PO), and pelvic torsion (PT) were measured with the Formetric 4D. Children were classified as uncrossed and cross-legged sitting groups according to postures, as sedentary, moderately-active, and highly-active groups according to physical activity levels, and as low, mid, and high groups according to sitting time. Logistic regression was used to determine the odds ratio (OR) and 95% confidence interval (95% CI) of pelvic deformations. RESULTS: Children with cross-legged sitting posture had significantly higher values in SA and PO than children with uncrossed sitting posture. Significant differences in SA, PO, and PT were found between the activity-based subgroups and a significant difference in PT between the sitting time-based subgroups. Compared with uncrossed sitting children (reference, OR=1), cross-legged sitting children had a significantly risk (OR=3.153, 95% CI=1.707-5.822) of PO deformation. Compared with highly active children (reference, OR=1), sedentary children had a significantly higher risk (OR=4.115, 95% CI=1.496-11.321) of PO deformation. In addition, moderately-active and sedentary children had significantly higher risks (OR=3.987 and 95% CI=2.044-7.777 and OR=5.806 and 95% CI=2.675-12.601, respectively) of PT deformation as compared with highly-active children (reference, OR=1). CONCLUSIONS: The current findings suggest that crossed-legged sitting posture and decreased physical activity are two of modifiable risk factors for spinal deformations in children.

분산 멀티미디어 서비스의 모델링

윤태형(Tae-Hyoung Yun),공지영(Ji-Young Kong),홍원기(Won-Ki Hong) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.2B

본 논문에서는 멀티미디어 시스템이 멀티미디어 응용 프로그램들에게 제공해야 하는 서비스들을 정의하고 이 서비스들을 객체 지향 방법론으로 모델링한 결과를 제시한다. 멀티미디어 응용 프로그램은 멀티미디어 시스템에서 제공하는 멀티미디어 서비스를 이용해서 보다 쉽게 개발되고 수행된다. 특히 이 논문에서 제시하는 멀티미디어 서비스에는 멀티미디어 응용 프로그램들과 멀티미디어 시스템 자체를 관리할 수 있도록 해주는 서비스들을 포함하여 멀티미디어 응용 프로그램들과 멀티미디어 시스템의 동작을 모니터하고 분석, 제어할 수 있도록 하고 있다.

여성 노인의 신체적 허약과 인지기능 및 우울증과의 연관성

이인환(In-Hwan Lee),공지영(Ji-Young Kong),진영윤(Young-Yun Jin),강현식(Hyun-Sik Kang) 한국생활환경학회 2017 한국생활환경학회지 Vol.24 No.2

This study examined the association of physical frailty with cognitive function and depression in elderly women. This was a cross sectional study involving 261 elderly women with mean age of 74.0±6.9 years. Body composition parameters was measured by dual-energy X-ray absorptiometry (DXA). Korean version of mini-mental state examination of dementia screening (MMSE-DS) and the center for epidemiologic studies depression scale (CES-D) were used to assess cognitive function and depression, respectively. Subjects were classified as robust, pre-frailty, and frailty based on the Fried criteria for frailty weight loss, exhaustion, low hand-grip strength, low gait speed, and physical inactivity. Logistic regression analyses were used to determine the odds ratio (ORs) and 95% confidence interval (CI) of frailty status for having mild cognitive impairment (MCI) and depression. Subgroup analyses showed significant linear decrease in MMSE-DS (P<.001) and significant linear increases in CES-D (P<.001) across incremental frailty status. Compared to the robust group (OR=1), the frailty group had significantly higher ORs of having MCI (OR=3.430, 95% CI=1.166-10.090, P=.025) and depression (OR=5.939, 95% CI=1.254-28.177, P=.025). The current findings suggest that a lifestyle intervention consisting of a physical activity and physical fitness should be promoted as a preventive means against cognitive impairment and depression symptoms associated with aging physical frailty

과학 실험 프로그램이 저소득층 아동의 과학 태도, 자아존중감, 자기유능감과 창의성에 미치는 효과

이석희 ( Seok Hee Lee ),김은진 ( Eun Jin Kim ),공지영 ( Ji Young Kong ) 한국초등과학교육학회 2010 초등과학교육 Vol.29 No.4

This study examined the beneficial effects of the science experiment program for Low-Income Family Children (LIFC) on their science attitude, self-esteem, self-competence, and creativity. The study involved 432 elementary school children of Low-Income Family who were divided two groups as an experimental group with 228 and a control group with 204. The experimental group was given by the science experimental program, whereas the control group was given by ordinary education programs for LIFC, such as supplementary education or after school care. The data about science attitude, creativity, self-esteem, and self-competence of two group children`s were collected and analyzed by four kinds of tests on each domain before and after implementing the science experiment program. During the period of the science experiment program, the children who were given the program were observed and reported by the program lecturers and the teachers, who worked at the after school care. The results are as follows; First, there was statistically significant increase on the average points of the experimental group on the three domains except self-esteem from the intra-group analysis. Second, there was also statistically significance between the scores of two groups on the creativity, self-esteem, self-competence from the inter-group analysis. Third, it was reported that the children who were experienced the program were changed positive on their personality and school learning.