• School Science Journal
• /
• v.12 no.2
• /
• pp.274-286
• /
• 2018

The role of instruments in scientific inquiry is very important. As science and technology develop, science inquiry instruments are also changing. IoT-based inquiry tools and output data, which are newly introduced in science inquiry class, can play a role in reaching the goal of scientific inquiry. The aim of this study is to find the appropriateness of digital inquiry instruments based on Kirschner and Kreijns (2004).T he students who participated in this study were 8 middle school students located in Seoul and they investigated the quality of classroom air. During the four months of the inquiry activity, we had participant observation and retrospective interviews. We recorded the data, analyzed it, and coded it in terms of educational affordance. As a result, there are four educational affordance of digital inquiry instruments. First, it stimulates students' interest and motivation to learn basic knowledge for data processing, because digital inquiry instruments deals with real-life data. Second, the digital inquiry instruments as a complex sensor made a big data so it serves as an affordance that leads to hypothetical hypotheses. Third, because of the features and limitations of the digital inquiry instruments itself, it shapes and limits the design of the science inquiry method. Fourth, since the data is measured in real time, the amount of data is enormous. So the digital inquiry instruments serves as an affordance of increasing the information processing competence to analyze data. In order for science inquiry activities based on digital inquiry tools to be activated, various policy and economic supports are needed, such as the science environment, the contents of the software, software training, and guided learning materials.

• Journal of KIISE
• /
• v.43 no.10
• /
• pp.1165-1172
• /
• 2016

In cloud storage environment, deduplication enables efficient use of the storage. Also, in order to save network bandwidth, cloud storage service provider has introduced client-side deduplication. Cloud storage service users want to upload encrypted data to ensure confidentiality. However, common encryption method cannot be combined with deduplication, because each user uses a different private key. Also, client-side deduplication can be vulnerable to security threats because file tag replaces the entire file. Recently, proof of ownership schemes have suggested to remedy the vulnerabilities of client-side deduplication. Nevertheless, client-side deduplication over encrypted data still causes problems in efficiency and security. In this paper, we propose a secure and practical client-side encrypted data deduplication scheme that has resilience to brute force attack and performs proof of ownership over encrypted data.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.21 no.5
• /
• pp.599-606
• /
• 2018

Failure data of systems in many field can be erroneous, which influences the reliability analysis of the systems. The general form of failure data is right censored data with accurate time information. But due to its nature of data collection in the military field, failure time of one-shot weapon systems can have errors which are related to the maintenance period. So this paper suggests a model that can reduce the error by utilizing interval censored data as an alternative to right censored data in weibull distribution.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.16 no.3
• /
• pp.304-313
• /
• 2013

Wireless Sensor Networks, especially supporting for surveillance service, are one of the core properties of network-centric warfare(NCW) that is a key factor of victory in future battlefields. Such a tactical surveillance sensor network must be designed not just for energy efficiency but for real-time requirements of emergency data transmission towards a control center. This paper proposes efficient clustering-based methods for supporting mobile sinks so that the network lifetime can be extended while emergency data can be served as well. We analyze the performance of the proposed scheme and compare it with other existing schemes through simulation via Qualnet 5.0.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.14 no.1
• /
• pp.106-113
• /
• 2011

This paper describes Data Acquisition & Analysis System(DAS) for analysis of the multi-function radar. There are various information - beam probing data, clutter map data, plot data, target tracking data, RT tracking data, radar signal processing data, interface data - this device saves. The most important thing of data analysis is that a researcher gets a view of the whole data. The DAS intergrates with all of the data and provides overall information on the time matters occur. This is very useful advantage for approaching the matter easily. System algorithms of multi-function radar are improved by using this advantage. As a result of, range blank region have fallen about 72% and it is able to keep track in jammer environment.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.11 no.6
• /
• pp.55-62
• /
• 2008

An Estimation of VHF datalink range for EW(Electronic Warfare) equipment in the sea environment was studied to predict the datalink range between transmitting and receiving station. We consider refraction and reflection in addition to the basic radar equation. The reflection especially includes propagation factor in case of spherical earth as well as flat earth. The estimation result can predict the real datalink range within 5% error.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.9 no.4
• /
• pp.39-49
• /
• 2006

LYNX ESM has not only ESM function but Datalink function. The LYNX boarded equipment Interface and Channel coding is needed for LYNX Datalink to support the mother ship with tactical data included threat radar analysis data of LYNX ESM, navigation data, Radar and Sonar of LYNX. The interface of loaded equipments are various protocol like as ARINC419/429, RS232, Synchro, Sync Serial. The Channel coding of Convolution-Scrambler-Interleaver-Bit Stuffing is applied for recovering the transmission data mixed with propagation errors in sea environment.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.12 no.5
• /
• pp.652-659
• /
• 2009

To analyze and verify the performance of a pulse radar without the real target data, there is a need to make the simulated signal which is similar to the received signal of the real target. In this paper, a method of the received signal generation for the pulse radar is proposed to solve the above need. The user-made scenarios are used to model the fast and small target and the clutter data based on the ground environment. These data are transformed into the electric signal using the proposed method. The efficiency of the proposed method is proved by comparing the signal of a field test with the simulated signal.

• Journal of Information Management
• /
• v.33 no.4
• /
• pp.129-144
• /
• 2002

SICI(Serial Item and Contribution Identifier) is intended primarily for use by those involved in the use or management of serial titles and their contributions. And SICI is a standard that is developed for interoperability and electronic data exchange because of increasing need of the unique resource identifier. This paper introduces metadata standard ANSI/NISO Z39.56 that relates serials management. And it examines applications and implementations of Z39.56 toward serials management.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.7 no.2 s.17
• /
• pp.22-31
• /
• 2004

In this paper, the measurements preprocessing algorithm for the fading of bearing and frequency measurements is proposed, which can improve the performance of BFTMA(Bearing and Frequency Target Motion Analysis). The fading and detection relation between bearing and frequency are rigorously established for measurements preprocessing, and BFTMA can be carried out the estimation of target motion by using measurements preprocessing. Batch estimation with bearing and frequency using the proposed algorithm can be applied to estimate the initial target states despite of the fading of frequency measurement. Simulation results show that BFTMA using the proposed measurements preprocessing has superior estimation performance, compared with batch estimation using only bearing measurements.