• Journal of the Korea Society of Computer and Information
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• v.15 no.7
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• pp.109-116
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• 2010

In this paper, we analyse empirically the relation between the IT competency of the Group enterprises, and the management performance of the subsidiary IT service firms in Korea. The 24 IT service firms and relative Group enterprises are included for analysis. The various hypotheses established are validated by t-test method statistically. The results shows that IT competency level of the Group enterprises was affected by not only their sales volumes, new investment volume of IT service, but system management(SM) and inner captive market's sales volume of subsidiary IT service firms also. Additionally the sales volume of IT service firms was affected positively by their inner-captive market's sales, system management sales volume, and the sales volume of their Group enterprise. The service competency of the subsidiary IT service firms is shown as more high in the lower intensity of outer-captive and system integration(SI) business, as well as in the upper intensity of inner-captive and SI business.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.24-25
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• 2022

Based on the case of Busan Port November anchorage, which is a group anchorage, related regulations to promote group anchorage safety management, the turning radius of anchored ship, and more accurate weather information collection and safety through improvement of the supporting system for VTS operations to apply the anchorage location in accordance with reality that it is a suggestion for management improvement methods.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.8
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• pp.1083-1093
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• 1993

Recently, some applications require the multicast service that transmit messages to multiple destinations in computer communication network enviroment. Multicast service is to send messages to the group which consists of a number of processes. A multicast group is a collection of processes which are destinations of the transmitted messages and these processes may run on one or more hosts. Therefore, it is important to manage each member of process groups in order to provide efficient multicast services. In this paper, we design and implement group management system to support multicast services. Group Management System was designed with Process Group Management System(PGMS) and Host Group Management System(HGMS). We have implemented basic primitives of PGMS, HGMS. Also, membership tree management algorithm is designed and implemented. Membership tree provides the relation of the members of multicast groups and routing Informations.

• Journal of the Korea Society of Computer and Information
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• v.16 no.1
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• pp.101-115
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• 2011

PECOLE (Peer-to-Peer Collaborative Environment) is a P2P-based multimedia distributed collaborative environment supporting a collaborative workspace which is composed of a variety of collaborative applications such as multi-chat, video conferencing, screen sharing and etc. Unfortunately, due to the PECOLE's simple group management, it is impossible to perform collaboration activities while joining multiple groups. In this paper, we present the design and implementation of PECOLE+ which is an extension of PECOLE. PECOLE+ resolves the drawback of PECOLE by providing the Group Management Service and the Workspace Management Service. The Group Management Service provides functionalities such as creating groups, joining multiple groups, and searching groups, and etc. The Workspace Management Service provides each group with an associated workspace, supporting the execution of collaborative applications over the workspace. In addition, any collaborative applications with the provided plug-in interfaces can be executed over the workspace as a PECOLE+ collaborative application.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.17 no.2
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• pp.3-17
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• 2007

Receiver access control scheme is proposed to protect multicast distribution tree from DoS(Denial-of Service) attack induced by unauthorized use of IGMP(Internet group management protocol), by extending the security-related functionality of IGMP. Based on a specific network and business model adopted for commercial deployment of IP multicast applications, key management scheme is also presented for bootstrapping the proposed access control as well as accounting and billing for CP(Content Provider), NSP(Network Service Provider), and group members.

• Journal of Korean Public Health Nursing
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• v.28 no.2
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• pp.258-269
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• 2014

Purpose: This study was conducted in order to present the effects of case management of a home visiting health service for clients with hypertension. Method: One-group pretest-posttest design was used. The subjects were 280 clients who received case management among the first and second registered group. The data were eight-week-case management results from January to December, 2010. In order to evaluate the effect of the visiting nursing service, biological indexes(blood pressure, total cholesterol, triglyceride, high density lipoprotein, low density lipoprotein, BMI) and self-care abilities(knowledge/attitude of hypertension, management of medication, nutritional care, confidence of self care) were measured. Result: Biological indexes and self-care abilities were improved, except total cholesterol, low density lipoprotein. Conclusion: The case management of home visiting health service by public health centers is considered to be an effective nursing service. Therefore, greater effort is needed for better maintenance of case management, and more research is needed in order to examine a variety of biological indexes.

• The Transactions of the Korea Information Processing Society
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• v.6 no.5
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• pp.1241-1252
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• 1999

It is proposed in TINA, the open information telecommunication network architecture, that the definition of object group which is collection of objects provides a decrease of complex networking and a facility of object managing by service executing of application on distributed computing environment. Based on a new distributed object group model[13] we have been researched according to TINA specification, this paper proposed the object group model with the scheduler object and objects management mechanisms that can support real-time services on CORBA. To do this, we described the definition of object grouping and the requirements to suggest the object group model supporting real-time service, designed the object group structure and functional components containing in an object group using James Rumbaugh's modelling[12], and showed a class diagram of components in an object group. This paper designed IDLs of an object group manager and scheduler among the components, and finally showed the procedures of management and service interconnections between objects in the different object groups vi ETD.

• ETRI Journal
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• v.43 no.5
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• pp.932-940
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• 2021

Currently, research on network functions virtualization focuses on using microservices in cloud environments. Previous studies primarily focused on communication between nodes in physical infrastructure. Until now, there is no sufficient research on group key management in virtual environments. The service is composed of microservices that change dynamically according to the virtual service. There are dependencies for microservices on changing the group membership of the service. There is also a high possibility that various security threats, such as data leakage, communication surveillance, and privacy exposure, may occur in interactive communication with microservices. In this study, we propose an ID-based group key exchange (idGKE) mechanism between microservices as one group. idGKE defines the microservices' schemes: group key gen, join group, leave group, and multiple group join. We experiment in a real environment to evaluate the performance of the proposed mechanism. The proposed mechanism ensures an essential requirement for group key management such as secrecy, sustainability, and performance, improving virtual environment security.

• Journal of Korean Academy of Nursing
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• v.39 no.3
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• pp.366-375
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• 2009

Purpose: To evaluate the effects of case management using Resident Assessment Instrument-Home Care(RAI-HC) in home health service for older people. Methods: All elders were assessed at baseline and 3 months later using RAI-HC. The change of function in the intervention group was compared with that of a conventional intervention group. Function was measured with Activities of Daily Living(ADL), Instrumental Activities of Daily Living(IADL), Cognitive Performance Scale(CPS), Depression Rating Scale(DRS), Pain and the number of Clinical Assessment Protocols(CAP). Results: Among ninety two elders participated in the program, 59 were allocated to the case management group and 33 to the conventional group. The intervention, home health service by a nurse over a 3 month period, consisted of comprehensive assessment, case conference for care plan, direct care, education and referral, and outcome evaluation. The percent of elders whose function improved in the intervention group was greater than the conventional group for depression(odds ratio [OR]: 10.941, confidence interval [CI]: 2.338-51.206), IADL(OR: 4.423, CI: 1.151-16.999) and the number of CAP(OR: 11.443, CI: 3.805-34.410). Conclusion: Case management was effective for older people in the community. The effect might have resulted from individual, systematic intervention, however, standards of service including eligibility criteria for case management and collaboration of multi-disciplines is required for more effective home health service programs.

• Journal of Society of Preventive Korean Medicine
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• v.18 no.2
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• pp.69-80
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• 2014

Objective : The purpose of this study was to investigate the effects of Intensive management program of home visiting health service for community dwelling Clients with Arthralgia. Method : A nonequivalent control group pretest-posttest design was used for this study. Elderly people who agreed to participated in the study were assigned to an experimental group (n=30) or a control group (n=30). For an experimental group, The Intensive Management program was given as a home visiting health service once a week for 8 weeks. Study outcomes were measured by structured questionnaires from August, 2013 to october. For data analysis, Chi-square test, Fisher's exact probability test, independent t-test, and paired t-test were performed using SPSS version 17.0. Results : Changes in pain, fatigue, medical service utilization and self management compliance were significantly different between the two groups in pretest and posttest(t=-4.828, p < .001), (t=-4.944, p =.001), (t=2.176, p =.039), (t=3.141, p =.003). And there were significant difference between the two groups in left extension and flexion of knee(t=-2.241, p < .031), (t=2.166, p < .037). Conclusion : The intensive management program was effective on decreasing pain, fatigue, medical service utilization, and increasing flexibility of knee joint and self-management compliance of community dwelling clients with arthralgia.