• School Mathematics
• /
• v.13 no.4
• /
• pp.599-614
• /
• 2011

According to prior research studies, comparison of two data sets promote informal and formal statistical reasoning, which may mediate descriptive and inferential statistics. However, there has been relatively little attention given to the mediation of both descriptive and inferential statistics. We attempted to identify which statistical concepts or factors students used and how they applied concepts or factors to make decisions when they compared data sets. We also investigated the characteristics and changes of the view of concepts and factors. As a result, we identified that students paid attention to data value, center, spread, and sample, which are important factors of inferential statistics. Students' understanding of each factors were sometimes appropriate for inferential statistics, but sometimes not. From the results, we suggest instructional ideas for a task which can connect descriptive and inferential statistics.

• Journal of the Economic Geographical Society of Korea
• /
• v.2 no.1_2
• /
• pp.83-102
• /
• 1999

The aim of this paper is to explore the trend and structural features of unemployment in Germany and to review the local and regional labour market policy against the unemployment. Unemployment has been one of the major issues in Germany since the oil shocks oi 1973-74 and 1978-80. The unemployment rate in western Germany was low at the time of reunification in 1990 and the next consecutive two years. Since then, the unemployment rate has sharply risen due to the restructuring of industries. In an effort to reduce the unemployment and to search (or new employment policies, the specific roles and advantages of communal units have been appreciated. The local and/or regional labour market policies are characterized as fellows: the corporative networking of all the agents including local administration, education institutes, regional labour bureau, firms and interest groups; the systematic integration of the various instruments which have been separately installed by different sectors; and the target-oriented adjustment of labour market approaches in the local circumstances.

• Journal of Korean Society of Forest Science
• /
• v.104 no.3
• /
• pp.454-465
• /
• 2015

This research analyzed characteristics of networks among stakeholders related to forest trail management. Results of analysis showed that Jiri way and Uljin trail had council-led network. As both trails were supported by government, the government had much power to make decisions and manage trail. But parts that mediated differences of interests among various stakeholders were insufficient. To manage forest trails effectively, it is necessary that hub organization which can have networks and make decision considering different interests have to develop and it have to authorize hub organization to take a right role for management of forest trails.

• Economic and Environmental Geology
• /
• v.44 no.5
• /
• pp.433-442
• /
• 2011

In Korea, groundwater management has been conducted based on the estimation of annual average of groundwater recharge. Since groundwater recharge and surface water-groundwater interactions show spatiotemporal variation, continuous monitoring and dynamic analysis must be carried out to evaluate the sustainability of groundwater resources. In this study, SWAT-MODFLOW, an integrated surface water-groundwater model was used to analyze surface-groundwater interactions for various groundwater pumping scenarios in Musimcheon watershed. When current usage is applied, the baseflow reduction is about 16%, and annual averaged storage reduction is about 27 mm for whole watershed. As a holistic approach to groundwater sustainability considers the hydrological, ecological, socioeconomic, technological aspects of groundwater utilization, the exploitable groundwater should be determined by physical analysis as well as social compromise in a community.

• Journal of Korean Society for Geospatial Information Science
• /
• v.14 no.3 s.37
• /
• pp.47-53
• /
• 2006

In this contribution, an integration of seamless navigation system for the pedestrian is introduced. To overcome the GPS outages in various situations, multi-sensor of GPS, INS, electronic barometer and compass are considered in one Extented Kalman filter. Especially, the integrated system is designed for low-cost for the practical applications. Therefore, a MEMS IMU is considered, and the low quality of the heading is compensated by the electronic compass. In addition, only the pseudoranges from GPS measurements are considered for possible real-time application so that the degraded height is also controlled by a barometer. The mathematical models for each sensor with systematic errors such as biases, scale factors are described in detail and the results are presented in terms of a covariance analysis as well as the position and attitude errors compared to the high-grade GPS/INS combined solutions. The real application scenario of GPS outage is also investigated to assess the feasible accuracy with respect to the outage period. The description on the current status of the development and future research directions are also stated.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.19 no.6
• /
• pp.973-984
• /
• 2017

There is a growing need to apply TBM tunnelling method for the construction of underground facilities such as subways and utility tunnels in urban areas. Due to the variability and uncertainty of the ground, tunnelling in urban areas has various safety hazards which could cause damage to people and properties and it is very costly to recover from accidents. Therefore, it is very important to identify hazards from the planning and design phase and to establish risk mitigation measures. In this study, a total of 31 hazards affecting the stability of TBM tunnelling works in urban areas were listed from both the technical literature and correspondence with experts in tunnelling area. The importance and priorities of the hazards were analyzed by conducting Delphi technique, which is a decision-making method by consensus among experts. Finally, 12 hazards that satisfy the content validity criteria were settled and could be used as major control factors for accident prevention during TBM tunnelling works.

• Journal of the Korea Society of Computer and Information
• /
• v.25 no.2
• /
• pp.93-103
• /
• 2020

The telecare medical information system (TMIS) supports convenient and rapid health-care services. A secure and efficient authentication and key agreement scheme for TMIS provides safeguarding electronic patient records (EPRs) and helps health care workers and medical personnel to rapidly making correct clinical decisions. Giri et al. proposed an RSA-based remote user authentication scheme using smart cards for TMIS and claimed that their scheme could resist various malicious attacks. In this paper, we point out that their scheme is still vulnerable to lost smart card attacks and replay attacks and propose an improved scheme to prevent the shortcomings. As compared with the previous authentication schemes for TMIS, the proposed scheme is more secure and practical.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.22 no.4
• /
• pp.624-633
• /
• 2018

While the multimedia lecture system has been getting smart using immerging technology, the microphone still relies on the classical approach such as holding in hand or attaching on the body. In this paper, we propose a ceiling mounted array microphone system that allows a wide reception coverage and instructors to move freely without attaching microphone. The proposed system adopts cell and handover of mobile communication instead of a complicated beamforming method and implements a wide range microphone over several cells with low cost. Since the characteristics of unvoiced speech is similar to Pseudo Noise it is shown that soft handover are possible with 3 microphones connected to delay-sum multipath receiver. The proposed system is tested in $6.3{\times}1.5m$ area. For real-time processing the correlation range can be reduced by 82% or more, and the output latency delay can be improved by using the delay adaptive filter.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.11
• /
• pp.8021-8029
• /
• 2015

This study obtains design assessment indexes that should be considered in order to improvements of the public space was to analysis the importance in the public officials/academics and practitioners side. Obtained assessment topics in accordance with characteristic of public space through previous research to them and after a detailed selection indicators was so lead through the FGI. Derived surface was subjected to the significance analysis AHP through the survey expert. For this study, the importance of the public space are working professionals usability, publicness, environment, connectivity, identity, spatiality the order, public officials/academics usability, environment, connectivity, identity, spatiality, publicness the order. In addition, professionals working in the comprehensive analysis of the most important priority was to recognize safety, public officials/academics of the most important element appeared to have cleanliness. The results obtained in this study will be used as an index that can be used in planning and evaluation for consideration of the next improvement of public space.

• Journal of vocational education research
• /
• v.29 no.3
• /
• pp.157-185
• /
• 2010

This study aims to develop a process-oriented evaluation criteria that can be applied during the collection, description, and the provision of information necessary to improving and sustaining the cyber education program for human resource development. The conclusion obtained in the study is as described below. First, the process-oriented evaluation criteria of cyber education program for human resource development was divided into 4 dimensions, 13 evaluation categories, 29 evaluation sub-categories, and 125 evaluation clauses. Secondly, the process-oriented evaluation criteria of cyber education program for human resource development was divided into 4 dimensions, 13 evaluation categories, 29 evaluation sub-categories, and 125 evaluation clauses through the Delphi research method. Thirdly, the contents validity ratio (CVR) of each clauses ranged between .31-1.00 and therefore can be said to be valid. Also, the Cronbach's credibility for the validity of the developed evaluation criteria scored .980.