• Journal of KIISE:Information Networking
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• v.32 no.6
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• pp.696-704
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• 2005

Flooding is usually utilized to find a multi hop route toward the destination which is not within transmission range in Ad Hoc networks. However, existing flooding schemes deteriorate the network performance because of periodic message exchanges, frequent occurrence of collisions, and redundant packet transmission. To resolve this, a flooding scheme using on demand cluster formation is proposed in this paper. The scheme employs ongoing Packets for constructing a cluster architecture as the existing on demand clustering scheme. Unlike to the existing on demand clustering scheme, the scheme makes use of unicast packet transmission to reduce the number of collisions and to find the flooding candidates easily. As a result, the proposed scheme yields fewer flooding nodes than other schemes. Simulation results proved that the proposed scheme reduces the number of transmissions and collisions than those of two other schemes.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.8
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• pp.5189-5197
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• 2015

This study is intended to look into early childhood teachers' perceptions and needs for forest experience activities. To achieve this, a survey was carried out to 170 early childhood teachers in kindergartens and child care centers in Daejeon city. The SPSS(Statistical Package for Social Science) v. 18.0 was used for data analysis through the process of data coding and data cleaning. The frequency analysis was conducted for the general state of those surveyed. The frequency analysis, ANOVA and factor analysis were conducted for the perceptions and needs for forest experience activities. The findings showed that early childhood teachers had positive perceptions for the educational effects of forest experience activities. Especially, they perceived that the educational programs of forest experience activities need to be highly recommended to early children as forest experience education is important for forest experience activities. Consequently, forest experience education is just as important and useful for early children to learn the importance of coexistence with human and nature, and develop a sense of community by interacting with nature.

• Journal of the Society of Disaster Information
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• v.13 no.2
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• pp.139-146
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• 2017

This research verified that how citizen feel about police protection for the mass rally and how they trust about police and private security. Mass rally is lots of people gathering therefore, each of member could feel fear for their safe. And that kind fear has effect on success of rally Therefore we researched that security level by police and private security and the result is that most of people think that the charge of security is police and they think police member need to be more for their security. And police should be involved for the rally security. But they don't think for the private security.

• Journal of Service Research and Studies
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• v.8 no.1
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• pp.59-72
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• 2018

In the perspective of service, it is important to institute certification process required by International Standard Organization (ISO) for software (SW) development process, since Information and Communication Technology (ICT) takes high portion of the Korean industry and its certification for SW is essential internationally for trade. In addition, the certification service provided by BPMN tools like ADONIS is absolutely necessary. In that perspective, this paper proposes a new approach to satisfy this kind of necessity. This approach provides the certification service for the safety of SW required at the international level in Korean industry. Furthermore, the approach can be applied to other domains beside the SW. In order to demonstrate the approach, this paper shows how to guarantee service design for certification of ECSS-E-40 of European Space Agency (ESA) with ADONIS. This paper focuses on specification and verification of SW in E-40, and the main requirement for the verification will be safety of the SW.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.35 no.2
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• pp.45-57
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• 2017

The royal tombs of the Joseon Dynasty are divided into the entrance space of the inner and outer spirits in accordance with the characteristic of the ritual act. In each space, the ritual facilities are arranged and managed according to the characteristics of ritual acts and space. In the case of the Joseon royal tombs listed in the World Heritage List in 2009, further conservation and management of the original form is required, and the need to restore the original form is required. Especially, Yungneung and Geolleung requires landscape management in accordance with the World Heritage site management regulations, for example, management of horizontal 60 degrees view. This study aims to propose a prototype verification, preservation and restoration plan for the landscape around the core area of the damaged source. Through the verification of the old literature and field investigation, conservation and restoration plan is proposed for the landscape of the ridge, the water system, the scenery around the ridge line, and the historical scenery.

• Journal of IKEEE
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• v.5 no.1 s.8
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• pp.43-51
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• 2001

As the density of memories increases, unwanted interference between cells and coupling noise between bit-lines are increased. And testing high-density memories for a high degree of fault coverage can require either a relatively large number of test vectors or a significant amount of additional test circuitry. So far, conventional test algorithms have focused on faults between neighborhood cells, not neighborhood bit-lines. In this paper, a new test algorithm for neighborhood bit-line sensitive faults (NBLSFs) based on the NPSFs(Neighborhood Pattern Sensitive Faults) is proposed. And the proposed algorithm does not require any additional circuit. Instead of the conventional five-cell or nine-cell physical neighborhood layouts to test memory cells, a three-cell layout which is minimum size for NBLSFs detection is used. Furthermore, to consider faults by maximum coupling noise by neighborhood bit-lines, we added refresh operation after write operation in the test procedure(i.e.,$write{\rightarrow}\;refresh{\rightarrow}\;read$). Also, we show that the proposed algorithm can detect stuck-at faults, transition faults, coupling faults, conventional pattern sensitive faults, and neighborhood bit-line sensitive faults.

• The Transactions of the Korea Information Processing Society
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• v.7 no.5S
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• pp.1666-1675
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• 2000

This paper proposes a RTWM (Real-Time Web Middleware) framework for real-time EC(Electronic Commerce) systems. RTWM system is extended the existing COS( CORBA Object Service) model added to the event monitoring, real-time scheduler, real-time event filtering for supporting real-time concept of EC systems. Especially, this paper is concentrated on providing suitable event filtering function for EC system in order to meed various user time requirements under distributed system environment. It stores time constraint requirements an interesting event information input from users into QoS repository, then processes the data through appropriate RTFA(Real-Time Filtering Agent) module when real-time events occur. From this method, users can get the filtered event result reflected their requirements about real-time filtering. It means this system provides thigh QoS to users. In addition, it results in decreasing network traffic as unnecessary event information is filtered from network.

• Convergence Security Journal
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• v.20 no.1
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• pp.25-32
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• 2020

In the midst of the rising need for Industrial Security experts, the development of National Competency Standards(NCS) with regards to industrial security is a very important and urgent task. The NCS standardizes university-level academic curriculum and qualification systems and connects them with the industry's needs. This study has extracted, classified and analyzed security-related jobs and tasks requiring security expertise that is required within NCS. Through this study, many tasks have been confirmed to require security competencies that are different from those in IT-security, physical security that already exist as a NCS tasks. It is expected that the industry's needs of industrial security expertise will be reflected in future NCS development, which will be used as basic data for systematizing industrial security jobs and competency.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.16 no.4
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• pp.345-351
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• 2003

Due to increasing legal and market demands for safety in the automotive design process, the design of integrated seat is important more and mote because it should satisfy the conflict between stronger and lower weight for safety and environmental demands. In this study for crash simulations, the numerical simulations have been carried out using the explicit finite element program LS-Dyna according to the FMVSS 210 standard for safety test of seat. Since crash simulations are very time-consuming and a series of simulations that does not lead to a better result is very costly, the optimization method must be both efficient and reliable. As a result of that, statistical approaches such as design of experiments and response surface model have been successfully implemented to reduce time-consuming LS-Dyna simulations and optimize the safety and environmental demands together with nonlinear optimization algorithm. Design of experiments is used lot exploring the design space of maximum displacement and total weight and for building response surface models in order to minimize the maximum displacement and total weight of integrated seat.

• Journal of the Korean Society for Railway
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• v.14 no.6
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• pp.507-514
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• 2011

Recently, we developed a new subway train with many cooperative companies. The main controller of the subway train is Control and Monitoring System (TCMS), so we conducted requirement analysis of TCMS considering system performance, easy maintenance and service oriented flexibility. Hence, we adopted new bus architecture and QNX as a Real-time Operating System (RTOS) and developed hardware systems. The functions of TCMS are employed into two computers, service computer and control/monitor computer, to increase on their performance and to yield easy maintenance and to satisfy customer needs. The TCMS controls and monitors control devices equipped in the train through various protocols which are implemented in hardware. In order to evaluate the performance of the system and to satisfy reliability, various experiments including EMC/ECI were performed. Now the TCMS is installed on the newly developed train and is under performance evaluation through test driving.