ATM의 CL 서비스 구조에 관한 연구

천은홍 又石大學校 1991 論文集 Vol.13 No.-

In this paper, asynchronous transfer mode(ATM) network architecture for supporting the connectionless(CL) service is presented. For this CL service, the architectures of physical layer, ATM layer and ATM adaptation layer(AAL) based on broadband integrated service digital networks(BISDN) are analyzed. The addressing scheme, AAL protocol data unit(PDU) and two cell transport methods for supporting ATM CL, service are discussed, and we propose the gateway architecture for inter-working the local area network(LAN) to BISDN, and describe the service scenario based on ISO high layer network protocol supporting connectionless mode.

OSI 안전성 관리를 위한 엑세스 제어 모델 연구

千殷弘 又石大學校 1994 論文集 Vol.16 No.-

A security management provides facilities for protection of network resources and informations. This paper deals with a access control service and mechanism for managed objects in network environment. The standard documentations for OSI security network management functions - Security Alarm Reporting Function, Security Audit Trail Function and Objects and Attributes for Access Control were analyzed. The security service and mechanisms that should be put in place in order to defend against security attacks are studied, and the architecture for security management of OSI network management is modeled, we propose the modified association control mechanism including symmetric and public key cryptosystem to provide peer-entity authentication and describe the authorization control procedures for managed objects to communication management information by making use of the CMIS.

분산환경에서의 OSI 안전성 관리 구조의 설계

千殷弘 又石大學校 1995 論文集 Vol.17 No.-

OSI security management is concerned with those aspects of security management relative to OSI and to security of OSI management. OSI security management activities consist of system security management. security service management and security mechanism management. A system security management is concerned with the management of security aspects of the overall OSI environment. We designed a security architecture for system security management in distributed on vironment, and describe the functions of security management agents for security alarm reporting and security audit trail. We extended the data structures for security log, which used to network management, and describe algorithms for secure association and security management operations.

DISK DRIVE INTERACE의 구현 및 분석에 관한 연구

千殷弘 又石大學校 1988 論文集 Vol.10 No.-

This paper deals with the implementation and analysis of disk drive interface. The disk drive controllers were designed using custom JC and were implemented on SPC 6000-32 bit computer. The interface controllers were tested on Benchmark test, Coretest and Test program to be developed to analyze performance of ST506/412 and ESDI.

단기교육으로 시행가능한 심실기능평가법

김원,임경수,오병연,홍은석,김영식,김선만,이부수,현석천,김영득 대한응급의학회 2000 대한응급의학회지 Vol.11 No.4

Background: The initial history, physical examination, and ECG assessment should focus on identification of potentially serious noncardiac or cardiac disorders, including coronary artery disease, congestive heart failure, and electrical instability at the emergency room. additionally, it is essential to define disease severity, stability and need for emergency therapy. echocardiography is a useful tool for this purpose. especially Doppler echocardiography may be more sensitive and time-saving diagnostic tool for the evaluation of patients presenting with cardiogenic symptoms. So we evaluate the feasibility of the echocardiographic measurement by emergency physicain after short-term course. Method and Results: Twenty volunteers(10 male, 38.8±9.3 years) were included in the study for measurement of myocardial performance index and established parameters of ventricular function using conventional echo-Doppler methods. Myocardial performance index: (ICT+IRT)/ET, was obtained by subtracting ejection time(ET) from the interval between cessation and onset of the mitral inflow velocity to give the sum of isovolumic contraction time(ICT) and isovolumic relaxation time(IRT). The most of mean values of echocardiogrphic parameters were not significantly different between those of cardiologist and those of emergency physicians(p<0.01). The duration for measuring myocardial performance index was shortest among echocardiographic parameters. the validity of echocardiographic parameters measured by emergency physicians was proved relatively good. Conclusion: It is proved to be feasible for emergency physician to perform echocardiographic evaluation of ventricular function after short-term course

도플러지수를 이용한 급성 심근경색증의 진단에 있어 노인 환자의 특징

김원,조규종,오세현,이영수,이은주,홍진숙,김영득,현석천,임경수 대한노인병학회 2000 Annals of geriatric medicine and research Vol.4 No.4

직무 기반 액세스 제어 모델과 제한

천은홍(Eun-Hong Cheon),김동규(Dong-Kyu Kim) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅲ

기존의 액세스 제어를 위해 TCSEC에 기술된 강제적 액세스 제어(MAC)과 임의적 액세스 제어(DAC)는 기밀성 보다 무결성을 요구하는 상업적 환경의 정보 보안에는 부족하여 이의 대안으로 보안 관리자가 액세스권한을 직무(Role)에 부여하는 비임의적 액세스 제어인 직무 기반 액세스 제어(Role Based Access Control : RBAC)가 주목 받고 있다. 본 논문에서는 액세스 제어 모델인 MAC와 DAC과 비교하여 최근 연구되고 있는 RBAC의 기본 개념을 분석하여 RBAC의 모델을 정형적으로 정의하고, 직무에 액세스권한을 부여하는데 따른 안전한 RBAC를 위해 필요한 의무 분리(Separation of Duty) 등의 제한(Constraint) 사항에 대하여 연구한다.

의무 분리를 위한 직무 기반 접근권한의 모델링

천은홍(Cheon Eun Hong),김동규(Kim Dong Kyoo) 한국정보처리학회 1998 정보처리학회논문지 Vol.5 No.7

The MAC(Mandatory Access Control) and DAC(Discretionary Access Control) policies which it was described for access control had been explored to prevent the unauthorized disclosure of classified information. A RBAC(Role Based Access Control) has been focused as an alternative to realize integrity for organization's information assets in commercial environment. A separation of duty for a authority and responsibility according to perform privileges has been researched today. With RBAC, when a user is assigned roles in a mutual exclusive sets, user must perform only privileges to ensure mutual exclusive property. There are some difficulties in representation and assignments of privileges for mutual exclusive roles. In this paper, we examine the inheritance properties of roles with partial ordering relations, and classify a kind of forms for the role hierarchy. We examine the relationships between roles and privileges, and modeling object privileges to ordinary privileges using the property of direct acyclic graph. A Privilege Graph can provide flexibility in representations and assignments of mutually exclusive privileges. We define the separation of duty including mutual exclusive roles and propose safety properties, and show that the role management algorithms can enforce separation of duty.

Actimicrobium antarcticum gen. nov., sp. nov., of the Family Oxalobacteraceae, Isolated from Antarctic Coastal Seawater

Kim, Eun Hye,Jeong, Hyun-Jeong,Lee, Yoo Kyoung,Moon, Eun Young,Cho, Jang-Cheon,Lee, Hong Kum,Hong, Soon Gyu Springer-Verlag 2011 Current microbiology Vol.63 No.2

Differences of Spinal Curvature, Thoracic Mobility, and Respiratory Strength Between Chronic Neck Pain Patients and People Without Cervical Pain

Ji Hong Cheon,Na Na Lim,Geun Su Lee,Ki Hong Won,Sung Hoon Lee,Eun Young Kang,Hyun Kyung Lee,Younkyung Cho 대한재활의학회 2020 Annals of Rehabilitation Medicine Vol.44 No.1

Objective To investigate the differences of spinal curvature, thoracic sagittal mobility, and respiratory strength between patients with chronic neck pain (CNP) and people without cervical pain, and to determine the correlation between respiratory strength and thoracic mobility in CNP patients. Methods A total of 78 participants were finally included in this study, of whom 30 had no cervical pain and 48 had CNP. The Neck Disability Index (NDI), cervical lordotic curvature, thoracic kyphotic curvature, thoracic sagittal range of motion (ROM), maximal inspiratory pressure (MIP), and maximal expiratory pressure (MEP) were measured and analyzed. Results In males, thoracic sagittal ROMMEP-MIP and MEP showed a significant difference between the no cervical pain group and the CNP group. In females, thoracic kyphotic curvature, thoracic sagittal ROMMEP-MIP, MIP, and MEP were significantly different between the no cervical pain group and the CNP group. Thoracic kyphotic curvature was significantly correlated with MEP and MIP in all population groups, and significantly correlated with NDI in the female group. Thoracic sagittal ROMMEP-MIP had a significant linear relationship with NDI, MEP, and MIP in all population groups. Conclusion The thoracic mobility during forced respiration was reduced in patients with CNP and was correlated with respiratory strength. Changes in the biomechanics of the cervicothoracic spine and rib cage due to CNP may contribute to impairment of respiratory strength.