• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.10 no.5
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• pp.424-434
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• 2017

In industrial wireless sensor networks, many applications require integrated QoS supporting. This paper proposes a reliable protocol for real-time monitoring in industrial wireless sensor networks. Retransmission is well-known to recover the transmission failure, however, this might cause the time delay to violate the real-time requirement. The proposed protocol exploits broadcasting feature of wireless networks and the temporal opportunity concept. The opportunities to relay the data packets are shared by the broadcasting feature and the temporal opportunity concept maximize the number of candidates in communication. Simulation results show that the proposed protocol is superior to the existing real-time protocols in term of real-time service and reliability.

• Journal of Korean Tunnelling and Underground Space Association
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• v.18 no.3
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• pp.331-339
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• 2016

Real time location (RTL) system which can control the safety of laborers in the underground space is developed in this study. This innovative system can monitor the location and history of movement of multiple laborers in real time. To accommodate constrains of the underground space, the system is portable and composed with low-battery mode. Since conventional method to detect the location of laborer with radio signal strength indicator (RSSI) contains high errors, new measurement system using accelerometers and correction method are suggested in this study. Field test is performed to validate the developed system. The error for moving laborer was 0.4 m and for non-moving laborers was 0.2 m. Thus, it is found that the new RTL system can be used to monitor the location of laborers in the underground construction space.

• Journal of Nutrition and Health
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• v.25 no.6
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• pp.518-528
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• 1992

This study examined Korean young parents' current concept about diet and cancer to plan a proper communication strategy about nutrition education for cancer risk reduction. The naturalistic study using in-depth open ended interviews was conducted to identify Korean young parents' concepts about diet and cancer. Fourteen Korean husbands and wives were interviewed, All interviews were tape recorded and concept maps were developed from their tape-recordings for analysis. Most interviewees believed that certain kinds of food or diet increase or decrease cancer risk. However some interviewees did not believe that food or diet can prevent cancer. most interviewees believed that KIorean's salty and hot diet was related to the prevalence of stomach cancer,. They also believed that meat fresh smoked or cured processed food and excessive fat intake increase the risk for cancer but vegetables and fruits decrease it They believed that grilling and barbecuing increase cancer risk Some interviewees believed that certain nutrients (Zn. Se) and food(soybean paste mushroom garlic ginseng and so on) have cancer preventive effect. Most interviewees though twenties or early thirties are important ages for cancer preven-tion. Newspapers woman's magazines radio TV were the primary source of information on diet and cancer.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.7
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• pp.2964-2970
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• 2012

The objective of this paper is to understand the characteristics of highschool students in selecting a career. The subject included 750 students from, who became a university student in 2011. The most of number of students answered that they applied to 3 to 4 universities and they decided their major and university on their last year of high school. Many placed weight on the major rather than the school. Among types of selecting career, family-type received the most voted. In selecting a major, the most answered that they consider their aptitude and then career opportunity. Most students said they were equipped with information and knowledge about the major they applied for beforehand. In selecting a university, many mainly applied for the ones with the highest chance of getting accepted. Many said they learned of the university from their high school/teacher or through the internet. A very few answered that they learned of the university through media such as TV/radio and newspaper. Therefore, appropriate information should be provided to the ones who have the greatest influence on students in selecting a career, family. Also, universities need to develop a promotion strategy that utilizes high schools as well as the internet and smartsphones.

• The Journal of the Korea Contents Association
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• v.15 no.4
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• pp.556-570
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• 2015

The purpose of this study was to see the characteristics of oral media, which is orality and literacy combined, in order to analyze its effect on the age of Reformation and today, and to draw applicable points on the present Christian mission. The electronic age is an age of secondary orality, the orality of telephones, radio, and television, which depends on writing and print for its existence. Historically, it is a well-known fact that the shift from orality to literacy and on to electronic processing has engaged in social, economic, political, religious and other structures. With this perspective, the study was divided into two parts. In the first part, researchers dealt with the characteristics of primary oral culture, examined how it combined with media literacy and became oral media, and witnessed how reformers in the sixteenth century utilized it timely along with what the ending result was. In the second part, researcher observed the characteristics of electronic media based on literacy and orality, and presented several applicable points to the present state of the Christianity.

• Journal of KIISE:Computing Practices and Letters
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• v.16 no.7
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• pp.794-798
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• 2010

Assuming that a wireless link is mostly used at the network edge and the wireless NIC driver keeps monitoring the error rate of its link, this paper proposes an enhanced TCP congestion control, TCP-L (TCP Link-Aware). TCP-L predicts true congestion losses occurred inside the wired link area by utilizing the wireless link error rate. As a result, it mitigates performance degradation caused from TCP congestion control actions when segments losses occur in a wireless link. Experimental results show that TCP-L provides better performance and fairness in lossy wireless links than existing TCP congestion control schemes. Our approach utilizing the characteristic of the link at TCP could be well adapted to new wireless environments such as Cognitive Radio and ACK-less IEEE 802.11, where a frame may be delivered with a very long delay or lost in the link.

• The KIPS Transactions:PartD
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• v.17D no.3
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• pp.193-202
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• 2010

Recently, there have been several researches on automatic object identification and distributed computing technology to realize a ubiquitous computing environment. Radio Frequency IDentification (RFID) technology has been applied to many business areas to simplify complex processes and gain important benefits. To derive real benefits from RFID, the system must rapidly implement functions to process a large quantity of event data generated by the RFID operations and should be configured dynamically for changing businesses. Consequently, developers are forced to implement systems to derive meaningful high-level events from simple RFID events and bind them to various business processes. Although applications could directly consume and act on RFID events, extracting the business rules from the business logic leads to better decoupling of the system, which consequentially increases maintainability. In this paper, we describe an RFID business aware framework for business processes in the Electronic Product Code (EPC) Network. This framework is proposed for developing business applications using business services. The term "business services" refers to generated events that can be used in business applications without additional data collection and processing. The framework provides business rules related to data collection, processing, and management, and supports the rapid development and easy maintenance of business applications based on business services.

• Journal of the Korean Vacuum Society
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• v.20 no.4
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• pp.307-312
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• 2011

As a technique for removing cancerous tumors from normal tissue, radio-frequency electromagnetic waves were employed to heating target cells up to the critical temperature, which kills the cancerous cells. However, its use in treating tumors in soft organs is limited by inconvenient factors, which are use of high-currents and long time operation. In this work, the feasibility of the localized heating by inserting four conducting electrodes with tiny direct current is investigated. The heat source is resulting from the electric field as known as resistive heating. We have investigated the temperature distribution as a function of applying DC voltages ranging from 10 V to 30 V with 10 V step. From the simulation results, the mushroom-like lesion shape by applying 20 V is generated by four electrodes within a few minutes, that is proper to the clinical application.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.10 no.2
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• pp.1-8
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• 2011

Traffic congestion is a source of significant economic and social costs in urban areas. Intelligent Transportation Systems (ITS) are a promising means to help alleviate congestion by utilizing advanced sensing, computing, and communication technologies. This paper proposes and investigates a basic and advanced ITS framework Advanced Traveler Information System (ATIS) using wireless Vehicle to Roadside (Centralized ATIS model: CA model) and Vehicle to Vehicle (DeCentralized ATIS model: DCA model) communication and assuming an ideal communication environment in the typical $6{\times}6$ urban grid traffic network. Results of this study indicate that an ATIS using wireless communication can save travel time given varying combinations of system characteristics: traffic flow, communication radio range, and penetration ratio. Also, all tested metrics of the CA and DCA models indicate that the system performance of both models is almost identical regardless of varying traffic demand and penetration ratios. Therefore, DCA model can be a reasonable alternative to the fixed infrastructure based ATIS model (CA model).

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.10 no.3
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• pp.2-17
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• 1999

Interpolated second order polynomials(ISOP's) are proposed to design efficient cascaded integrator-comb(CIC)-based decimation filters for a programmable downconverter. It is shown that some simple ISOP's can effectively reduce the passband droop caused by CIC filtering with little degradation in aliasing attenuation. In addition, ISOP's are shown to be useful for simplifying halfband filters that usually follow CIC filtering. As a result, a modified half band filter(MHBF) is introduced which is simpler than conventional halfband filters. The proposed decimation filter for a programmable downconverter is a cascade of a CIC filter, an ISOP, MHBF's and a programmable finite impulse response(FIR) filter. A procedure for designing the decimation filter is developed. In particular, an optimization technique that simultaneously designs the decimation filter is developed. In particular, an optimization technique that simultaneously designs the ISOP and programmable FIR filters is presented. Design examples demonstrate that the proposed method leads to more efficient programmable downconverters than existing ones.