• 한국컴퓨터정보학회논문지
• /
• 제24권4호
• /
• pp.123-128
• /
• 2019

In modern society, there are WEB sites that provides information in various fields by many advances in IT technology. As the number of users accessing the Web increases, one server becomes unavailable, and multiple servers are deployed to provide the service. In addition, systems that control servers are required to manage multiple servers. However, server control systems in the existing market are mostly those that notify managers through SMS and apps when a server's down or a controlled port is closed. However, in case of servers that generate a lot of traffic, the Web server and the WAS are operated and managed each independently. The WEB and WAS provide service by connecting to each other. However, the connection between WEB and WAS may be disconnected due to various environmental factors. In this case, the existing control system can not determine whether the service is working properly. Even in the case of WEB and WAS of a server that is operated independently, there is a phenomenon that the existing control system does not know the problem even when the normal service is not provided due to environmental factors such as disconnection to DB. In this paper, we implemented a system to check the normal state of Web service using Web crawling to solve this problem.

• 한국컴퓨터정보학회논문지
• /
• 제21권5호
• /
• pp.57-64
• /
• 2016

In this paper, we propose the design of railway safety common data model to provide common transformation method for collecting data from railway facility fields to Real-time railway safety monitoring and control system. This common data model is divided into five abstract sub-models according to the characteristics of data such as 'StateInfoMessage', 'ControlMessage', 'RequestMessage', 'ResponseMessage' and 'ExtendedXXXMessage'. This kind of model structure allows diverse heterogeneous data acquisitions and its common conversion method to DDS (Data Distribution Service) format to share data to the sub-systems of Real-time railway safety monitoring and control system. This paper contains the design of common data model and its DDS Topic expression for DDS communication, and presents two kinds of data transformation case studied for verification of the model design.

• 디지털융복합연구
• /
• 제12권12호
• /
• pp.303-311
• /
• 2014

클라우드 사용자들에게 책임 있는 서비스를 제공하는 클라우드 서비스의 책임 추적성(accountability)은 서비스 정책 준수, 모니터링 및 감사(auditing), 로그 정보 기록(logging) 등과 같은 여러 가지 기술을 적용한다. 궁극적으로 데이터 처리, 서비스 제공 과정에서 발생되는 여러 가지 문제들에 대해 누가 책임이 있는지를 판단함으로써 신뢰되는 클라우드 서비스를 제공하는 것을 목적으로 한다. 먼저, 부가가치가 높은 콘텐츠 서비스 제공 시에 안전하고 신뢰되는 DRM 클라우드 서비스를 제공하기 위해 본 논문에서는 콘텐츠 및 DRM 클라우드 서비스 체인을 이루는 클라우드 에코 시스템을 제시한다. 또한 콘텐츠 소유자와 콘텐츠 사용자의 DRM 클라우드 서비스에 대한 요구사항을 분석하고, 책임 추적을 위해 기록해야 할 로그 정보 및 모니터링 툴 구조를 제안한다.

• 한국측량학회지
• /
• 제36권3호
• /
• pp.177-184
• /
• 2018

In case that limited resources can be mobilized, non-structural countermeasures such as 'monitoring using Information and Communication Technology might be one of solutions to mitigate disaster risks. Having established the monitoring system, operational and maintenance costs to maximize the effectiveness might trouble the authority concerned or duty attendant who is in charge. In this respect, "Guerrilla Sensor" would be very cost effective because of the inherent mobility characteristic. The sensor device with the IRIS camera and GPS (Global Positioning System) equipped, is basically battery-operated and communicates with WCDMA (Wideband Code Division Multiple Access). It has a strong advantage of capabilities for 'Disaster Response' with immediate and prompt action on the spot, making the best use of IoT (Internet of Things), especially with the mobile web. This paper will explain how the sensor system works in real-time GIS (Geographic Information System) pinpointing the exact location of the abnormal movement/ground displacement and notifying the registered users via SMS (Short Message Service). Real time monitoring with early warning and evaluation of current situations with LBS (Location Based Service), live image and data information can help to reduce the disaster impact. Installation of Guerrilla sensor for a real site application at Gimcheon, South Korea is also reported.

• 디지털산업정보학회논문지
• /
• 제7권4호
• /
• pp.15-22
• /
• 2011

U-Healthcare service is a real-time service using the vital signs which are continuously transferred from monitoring sensors attached to mobile patients under the wireless network environments. It should monitor the health condition of mobile patients everywhere at any time. In this paper, we have improved two features of the three layered mobile patient monitoring system with load balancing ability. First, the simulation process has been improved by allowing the number of related nodes to be changed. Secondly, we have modified S node to which queue is added to reduce the loss rate of collecting data from patients during the delay of S node process. And the data from the patient with high priority can be transferred to the server immediately through the filtering function. Furthermore, we have solved the problem of redundancy in sharing information among S nodes by differentiating process time to each S node. By performing a DEVS Java-based system simulation, we have verified the efficiency of this improved system.

• 한국시뮬레이션학회논문지
• /
• 제12권3호
• /
• pp.69-81
• /
• 2003

To manage a cluster of distributed server systems, a number of management aspects should be considered in terms of configuration management, fault management, performance management, and user management. System performance monitoring and reporting take an important role for performance and fault management. In this paper, we present distributed system architecture modeling of a performance monitoring and reporting tool. Modeling architecture of four subsystems are introduced: node agent, data collection, performance management & report, and DB schema. The performance-related information collected from distributed servers are categorized into performance counters, event data for system status changes, service quality, and system configuration data. In order to analyze those performance information, we use a number of ways to evaluate data corelation. By using some results from a real site of a company and from simulation of artificial workload, we show the example of performance collection and analysis. Since our report tool detects system fault or node component failure and analyzes performances through resource usage and service quality, we are able to provide information for server load balancing, in short term view, and the cause of system faults and decision for system scale-out and scale-up, in long term view.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2009년도 춘계학술대회
• /
• pp.281-286
• /
• 2009

The proposed technique uses cyclic frame structure, where three periods such as beacon period (BP), mesh contention access period (MCAP) and slotted period (SP) are in a data frame. This paper studies on a mechanism to allow communication nodes (6lowpan) in a PAN with different logical channel for global healthcare applications monitoring technology. The proposed super framework structure system has installed 6lowpan sensor nodes to communicate with each other. The basic idea is to time share logical channels to perform 6lowpan sensor node. The concept of 6lowpan sensor node and various biomedical sensors fixed on the patient BAN (Body Area Network) for monitoring health condition. In PAN (hospital area), has fixed gateways that received biomedical data from 6lowpan (patient). Each 6lowpan sensor node (patient) has IP-addresses that would be directly connected to the internet. With the help of IP-address service provider can recognize or analyze patient data from all over the globe by the internet service provider, with specific equipments i.e. cell phone, PDA, note book. The NS-2.33 result shows the performance of data transmission delay and data delivery ratio in the case of hop count in a PAN (Personal Area Networks).

• 한국통신학회논문지
• /
• 제31권11B호
• /
• pp.969-978
• /
• 2006

멀티미디어 서비스의 증가는 인터넷 콘텐츠의 새로운 국면으로 나타나고 있다. IP텔레폰, 화상채팅과 같은 멀티미디어 서비스는 대역폭, 지터, 패킷유실, 전송지연 듯의 네트워크 파라미터에 민감한 데이터이다. 멀티미디어 서비스의 QoS 보장을 위해서 RTP/RTCP를 이용하여 네트워크 상황을 판단하고 전송률을 조절하는 기법이 연구되고 있다. 본 논문에서는 최선형(Best-Effort) 서비스를 제공하는 현 인터넷 구조에서 RTP/RTCP 구조를 확장하여 단방향 전송 지연시간을 구하고 이를 이용하여 네트워크 상황을 판단하는 기법을 제안한다. 또한 단방향 전송지연을 이용하여 급변하는 네트워크 상황에 즉각적으로 대처하기 위한 동적인 RTCP 구조를 제안한다. 모의 실험결과 제안한 단방향 전송 지연 기법은 GPS를 이용한 단방향 전송 기법과 유사한 성능을 보였으며, 제안한 동적 RTCP 기법은 적은 RTCP RR패킷 전송으로 패킷 손실률이 감소하는 효과를 얻었다.

• 한국재난정보학회 논문집
• /
• 제8권1호
• /
• pp.93-99
• /
• 2012

본 연구는 문헌연구를 기초로 기계경비서비스의 공급자인 기계경비업체의 서비스 담당자와 인터뷰를 실시하여 그 결과를 분석하여 오경보 관리방안을 제시하였다. 고객의 실수로 인한 오경보를 줄이기 위해 고객 시설의 특성에 맞는 교육도구의 제공이 필요하며, 고객의 실수에 의해 불필요한 출동이 이루어 졌을 경우 일정한 금액의 출동수수료를 고객에게 부과할 수 있는 제도적 합의를 도출할 필요가 있다. 기기의 결함 및 설치 등으로 인해 발생하는 오경보 문제를 개선하기 위하여 기기의 기술기준과 설치기준을 표준화 하는 것이 필요하며, 오경보에 영향을 많이 주는 열선감지기의 성능을 개선하기 위한 새로운 형태의 감지기 개발이 필요하다. 오경보에 대한 용어의 정의와 사용자에 대한 오경보 방지 교육내용을 보다 전문적이고 세부적인 가이드라인 형태로 규정화 하는 것이 필요하다.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
• /
• 제4권7호
• /
• pp.227-234
• /
• 2015

기존의 USN 실시간 모니터링 시스템은 데이터를 수신받아 별도의 서버 시스템에 데이터베이스를 구성하여 정보를 처리하였으나, 최근의 IoT 및 WoT 기술의 대두로 인해 기존의 USN 환경에 새로운 Social Web of Things(SWoT) 개념을 도입하면 소셜 네트워크 서비스(SNS) 상에서 비용 효율적이고 통합적인 관리, 공유, 접근을 가능케 할 수 있다. 본 연구에서는 응급상황 전파에 PUSH 메시지 서비스를 접목하여 전달 시간을 단축시키고, 별도의 서버 구축 없이 SNS가 제공하는 부가 기능만으로 동작하는 모니터링 시스템을 구성 및 구현함으로써 기존 SWoT 기반의 실시간 모니터링 시스템의 단점을 극복할 수 있는 개선형 모델을 제안하고 검증한다.