• Korean Journal of Soil Science and Fertilizer
• /
• v.45 no.6
• /
• pp.1173-1178
• /
• 2012

Water competition among domestic, industrial and agricultural sectors has been gradually heightened recently in Korea as the lack of water supply is expected in the near future. About 46% of nation's water use is consumed in paddy farming to produce rice. And the conservation of water resource and quality in agricultural sector is a pending issue in the nation's long term water management plan. New paddy rice farming techniques that use significantly less irrigation water are urgently required. System of Rice Intensification (SRI) that is now well known to produce more rice with less water consumption has not been tried in Korea yet. And environmental effect of SRI on greenhouse gases (GHGs) has not been well investigated. The objective of this study was to measure the effect of SRI on GHGs as well as water use and rice yield in a Korean paddy condition. Three experimental runoff plots $5{\times}15m$ in size were prepared at an existing paddy field. Runoff, GHGs emission and water quality were measured during the 2011 growing seasons while a Japonica rice variety was cultivated. Rice plants grew better and healthier in SRI plots than in continuously flooded (CF) and intermittently drained (ID) plots. Rice yield from SRI plots increased 112.8 (ID)~116.1 (CF)% compared with CF and ID plots. Irrigation requirement of SRI plots compared to CF plot reduced by 52.6% and ID plot reduced by 62.0%, meaning that about 37.9~47.4% of irrigation water could be saved. GHGs emission from SRI plots reduced by 71.8% compared to that from CF plot and by 18.4% compared to that from ID plot, meaning that SRI could help contribute to ease the greenhouse gas accumulation in the atmosphere. It was believed that SRI is a promising paddy farming technique that could increase rice yield, and reduce irrigation water requirement and GHGs emission not just in Korea but also other rice farming countries all over the world. However, it was recommended that long term studies under different conditions including rice variety, soil texture, water source, climate need to be conducted for reliable data for the development of environmental policies related to GHGs emission control and management.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.5 no.3
• /
• pp.288-293
• /
• 2010

In these information-communication society, the wireless system technologies are increasing to do all things with wireless solution for fast and convenient works. This trend drives ubiquitous solutions which are based on broadband wireless network that gives network connection whenever, everywhere. This paper deals a bookshelf management system using plower line communication and RFID module. This system includes a 900 MHz RFID reader, Passive RFID-Tags, an Atmeg128 microprocessor board attached LED Display Module, and a management PC with GUI Software. This system works well in power line communication, tag reading and LED display, and PC Management Software.

• Journal of Digital Convergence
• /
• v.10 no.2
• /
• pp.161-169
• /
• 2012

It requires a lot of costs and manpower to manage the election system. The electronic voting scheme is needed to make the election system to be economic and fair. Especially, wide spread use of smart phones and wireless networks makes the mobile voting is of major concern. In mobile voting scheme, a smart phone user can vote regardless of the places. In this paper, the mobile voting scheme is proposed where candidates can guarantee fairness of the election system. We analyze mobile voting requirements and create the mobile ID which has legal binding forces and PKI based digital signature keys. In the proposed scheme, a voter's ballot is signed by all candidates using undeniable multi-signature scheme. During the counting stage, the multi-signature on the ballot is not verified without help of all candidates.

• The Journal of Society for e-Business Studies
• /
• v.17 no.1
• /
• pp.137-150
• /
• 2012

For social demand and technological development, systematic private information management and security guidance have been enhanced; however, the issue of leakage and invasion of private information is shown in many ways. In the management of such private information, the issue of how to protect such information is one of the sensitive key elements. As a criterion to decide the management policy of each property information consisting of private information, this article suggests Dynamic-Security-Level-Measurement for property information. DSLM adopts the variable characteristics of property information as the element of measurement. By applying this method, it is possible to provide information management functions to cope with the changes of each property information security level of an individual actively. It is expected that this will improve the security of previous information management methods even more and also contribute to the improvement of security in integrated systems such as the integrated ID management system and electronic wallet.

• Proceedings of the Korea Contents Association Conference
• /
• 2006.11a
• /
• pp.238-241
• /
• 2006

지난 10년 동안 인터넷은 빠른 속도로 모든 분야에 확산되어 왔으면 이와 비슷한 현상으로 최근 몇 년 동안 무선 네트워크의 확산 역시 타른 속도로 보급되고 있는 추세이다. 그리고 무선 네트워크 침입의 형태와 기술 또한 시간과 비례하여 그 다양성이 점차 증가되고 있으며 공격 시도 및 침입에 성공하는 공격의 횟수도 증가하고 있다. 기존 무선 보안 시스템인 Wireless-IDS는 사고 대응 계획이 설계되고 기획되지 않으면, 보안성을 거의 제공하지 않는다. 그리고 이벤트를 감시하고 사고에 대응하기 위한 인적 요소 비용이 크게 소요되는 단점을 가지고 있다. 기존의 TMS는 필요에 따라 자동화되고 능동적인 대응 수단을 제공하기도 하지만, 새롭게 생성되는 많은 무선 위협의 경우 사람이 막아야 하는 현실을 고려하고 있다. 그리하여 본 연구에서는 무선 상에서의 위협을 자동적으로 관리하는 Wireless-TMS의 효율적인 관리를 위해 수많은 무선 트래픽 중에 위협을 어떻게 분류할 것인가에 초점을 맞추어 연구를 진행한다.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.10 no.6
• /
• pp.98-107
• /
• 2011

In this paper, we propose the location determination system of an agent mobile device using the information provided by the WLAN(Wireless LAN) infrastructure. This system is configured as a typical ESS(Extended Service Set)-type WLAN structure with real-time location positioning engine and thru AP(Access Point) controller. The positioning engine collects the information of agent devices using SNMP(Small Network Management Protocol) thru AP controller and utilize those information as Cell ID. for LBS(Location Based Service). In the result of a real office environment implementation, the average success rate of inter-AP roaming is measured to 62.5% and the duration time of the device information update within the AP is average of 11 second of time, which means this system is adaptable to the location based service of above average accuracy but somewhat less urgency.

• Journal of the Korean Operations Research and Management Science Society
• /
• v.23 no.4
• /
• pp.141-149
• /
• 1998

One of the difficulties in using the current Boolean-based information retrieval systems is that it is hard for a user, especially a novice, to formulate an effective Boolean query. One solution to this problem is to let the system formulate a query for a user from his relevance feedback documents in this research, an intelligent query reformulation mechanism based on ID3 is proposed and the sensitivity of its retrieval effectiveness, i.e., recall, precision, and E-measure, to various input settings is analyzed. The parameters in the input settings is the number of relevant documents. Experiments conducted on the test set of Medlars revealed that the effectiveness of the proposed system is in fact sensitive to the number of the initial relevant documents. The case with two or more initial relevant documents outperformed the case with one initial relevant document with statistical significances. It is our conclusion that formulation of an effective query in the proposed system requires at least two relevant documents in its initial input set.

• The Journal of Information Technology and Database
• /
• v.7 no.2
• /
• pp.17-32
• /
• 2000

As XML emerging as the Internet electronic document language standard of the next generation, the number of XML documents which contain vast amount of Information is increasing substantially through the transformation of existing documents to XML documents or the appearance of new XML documents. Consequently, XML document retrieval system becomes extremely essential for searching through a large quantity of XML documents that are storied in and managed by DBMS. In this paper we describe the design and implementation of BADA-IV/XML query processor that supports content-based, structure-based and attribute-based retrieval. We design XML query language based upon XQL (XML Query Language) of W3C and tightly-coupled with OQL (a query language for object-oriented database). XML document is stored and maintained in BADA-IV, which is an object-oriented database management system developed by ETRI (Electronics and Telecommunications Research Institute) The storage data model is based on DOM (Document Object Model), therefore the retrieval of XML documents is executed basically using DOM tree traversal. We improve the search performance using Node ID which represents node's hierarchy information in an XML document. Assuming that DOW tree is a complete k-ary tree, we show that Node ID technique is superior to DOM tree traversal from the viewpoint of node fetch counts.

• Korean Journal of Occupational Health Nursing
• /
• v.26 no.4
• /
• pp.207-217
• /
• 2017

Purpose: This study aimed to evaluate the workplace response system (WRS) against infectious disasters (IDs) based on the response attitudes and capacity of occupational health nurses (OHNs) who worked during the 2015 Middle East Respiratory Syndrome (MERS) outbreak in South Korea. Methods: Fifty-one participants who had worked as OHNs at the time of the 2015 MERS outbreak were surveyed from November 20 to December 10, 2016. Data were collected using a self-report questionnaire and analyzed using descriptive statistics and McNemaer's test. Results: According to the survey results, the following were lacking in the WRS: a dedicated ID-response team, manuals, related education programs for OHNs, and health education programs for workers. Results also confirmed that workers were vulnerable to new infectious diseases because of the lack of health checkups and support for workers before and after business trips abroad. Among the respondents, 98.0% answered affirmatively that an ID was important for health management in the workplace, but 64.7% answered that it was difficult to manage an ID. The perceived capacity items to respond to IDs ranged from 3.0 points to 3.3 points. This scores were generally high. Conclusion: As the WRS is currently insufficient, it is necessary to develop an adequate WRS to IDs by addressing the identified problems.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.4 no.1
• /
• pp.191-200
• /
• 2000

The marine accident is being highlighted as a serious worldwide problem for the guard station of human safety and the protection of marine environment pollution. Especially, the GMDSS is operated as a international rule for the safety of a large scale ship, but the small size ship's management is required a adaptive national rule because of the complex condition of national circumstance. This study is motivated to develop a ship's position tracking system combined with GPS information for VTS and control the ship navigation, velocity and longitude etc.. In Part of Navigation Data Transmission is GPS data transmission whih ship's ID using microprocessor and TX speed translation for flexibility with 4800∼2400 [bps]. Results show that the our system for data transmission using microprocessor is useful tool in maritime transmission as SSB used the main TX method of small ship and has a cost competitive power. Therefore, we will expected cost and technical competitive power compared to AIS. But those systems are still remained the unsolved problem for protection from marine accident.. Finally, we examined the semi-actual receiving state on simulated sailing in the around sea of Mok-Po harbor.