• Journal of Families and Better Life
• /
• v.8 no.1
• /
• pp.31-47
• /
• 1990

The purpose of this study were to investigate: 1) The level of information-processing competencies of children consumers. 2) The differences of information-processing competencises of children consumers according to the cognitive development stage, the variables related to social learning and the socio-ecomonic variables. 3) The independent influences of variables related to information-processing competencies of children consumers. 4) The independent influences of variables related to information-processing competencies of children consumers according to the cognitive development stage. For these purposes, a survey was conducted using questionaires. The questionaires consisted of mother's and child's were distributed to children of second and 6th grade and their mothers of 5 elementary schools in Seoul 634 cases were selected for data analysis. Then, these data were analyzed with statistical methods such as Frequency Distribution, Percentile, Mean, One-way Anova, Scheff -Test, T-Test, Pearson's Correlation and Multiple Regression Analysis. From these finding, the follawing suggestions are made. First, to improve information processing competencies of children consumers, children consumers should be offered the consumer information that is suitable to child's cognitive development stage. Second, the consumer education and learning practical discriminatory competencies on TV ads. should be conducted for children consumers and his mothers. Third, children consumers should have the opportunities to practice as a consumer. The last, children consumers in low-income should be offered the specially educational program.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.9 no.6
• /
• pp.49-54
• /
• 2009

Sensor nodes in wireless sensor networks operate in distributed environments with limited resources and sensing capabilities. Especially, a sensor node has a small energy. After the sensor nodes are distributed in some area, it is not accessible to the area. AIso, a battery of sensor node cannot change. One of the hot issues in wireless sensor networks maximizes the network lifetime through minimizing the energy dissipation of sensor nodes. In LEACH, the cluster head is elected based on a kind of probability method without considering remaining energy of sensor node. In this paper, we propose a cluster formation scheme that the network elect the node, which has higher energy level than average energy level of overall sensor network, as cluster head node. We show the superiority of our scheme through computer simulation.

• Journal of IKEEE
• /
• v.10 no.2 s.19
• /
• pp.123-127
• /
• 2006

An Ad-hoc network which is composed of mobile nodes only should be able to distribute the traffic load evenly to the network so that the network could utilize its resources effectively However, most of researches have been concentrated in channel establishment level, not in channel reestablishment level. In this paper, the existing AODV routing protocol has been modified and upgraded to disperse the traffic load more quickly A node which uses the modified AODV routing protocol proposed in this paper broadcasts a control message to adjacent nodes, which announces congestion around the node. In order to verify the performance improvement of the proposed protocol, simulation study has been carried out by using ns2 simulator.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.14 no.3
• /
• pp.147-153
• /
• 2014

In this paper, we propose smart emotional lighting control system based on the android platform. The proposed smart emotional lighting control system be configure android platform and sensibility lighting equipment, expansion device, zigbee module. Smart emotional lighting control system based on the android platform is automatic control possible using the illumination sensor, and by selecting the desired lighting partial control can be designed. The experimental results of the proposed smart emotional lighting control sensitivity than conventional lighting control system decreased the power consumption and efficient lighting control was possible. Office acts will be suitable conditions to control the color and brightness, so they can be controlled from the improves concentration and ability to work.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.44 no.4
• /
• pp.97-102
• /
• 2007

This paper presents our implemented, synthesized and tested on demand and partial reconfiguration approaches for FIR filters using Xilinx Virtex FPGAs. Our scope is implementation of a low-power, area-efficient autonomously reconfigurable digital signal processing architecture that is tailored for the realization of arbitrary response FIR filters on Xilinx Virtex4 FPGAs. The implementation of design addresses area efficiency and flexibility allowing dynamically inserting and/or removing the partial modules to implement the partial reconfigurable FIR filters with various taps. This partial reconfigurable FIR filter design shows the configuration time improvement, good area efficiency and flexibility by using the dynamic partial reconfiguration method.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.9 no.6
• /
• pp.1247-1252
• /
• 2005

Though a legged robot has a high terrain adaptability as compared with a wheeled robot, its moving speed is considerably low in general. For attaining a high moving speed with a logged robot, a dynamically stable walking is a promising solution. However, the energy efficiency of a dynamically stable walking is generally lower than the efficiency of a stable gait such as a crawl gait. In this paper, energy consumption of two walking patterns for a trot gait is simulated through modeling a quadruped walking robot named TITAN-VIII.

• Journal of Internet Computing and Services
• /
• v.10 no.4
• /
• pp.151-160
• /
• 2009

Wireless network solution is used in many area because of free mobility and easy of establishment. Sensors that compose wireless network need protocol that support wireless communication to share information each other. As representative protocol, we currently witnessed IPv6 protocol. However, due to the limitation of sensors's electric power and computing ability, it is inefficient that each sensors use this protocol. In this paper, we designed improved sensor circuit that can heighten energy efficiency in sensor network to solve these problem and composed algorithm that can pare down energy consumption using method to make unnecessary sensor in sleep-mode.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2011.02a
• /
• pp.130-130
• /
• 2011

최근 반도체 메모리 산업의 발전과 동시에 발생되는 문제들을 극복하기 위한 새로운 기술들이 요구되고 있다. DRAM (dynamic random access memory) 의 경우, 소자의 크기가 수십 나노미터 영역으로 줄어들면서, 단채널 효과에 의한 누설전류와 소비전력의 증가 등이 문제가 되고 있다. 하나의 캐패시터와 하나의 트랜지스터로 구성된 기존의 DRAM은, 소자의 집적화가 진행 되어 가면서 정보저장 능력이 감소하는 것을 개선하기 위해, 복잡한 구조의 캐패시터 영역을 요구한다. 이에 반해 하나의 트랜지스터로 구성되어 있는 1T-DRAM의 경우, 캐패시터 영역이 없는 구조적인 이점과, SOI (silicon-on-insulator) 구조의 기판을 사용함으로써 뛰어난 전기적 절연 특성과 기생 정전용량의 감소, 그리고 기존 CMOS (complementary metal oxide semiconductor) 공정과의 호환성이 장점이다. 또한 새로운 물질 혹은 구조를 적용하여, 개선된 전기적 특성을 통해 1T-DRAM의 메모리 특성을 향상 시킬 수 있다. 본 연구에서는, SOI와 SGOI (silicon-germanium-on-insulator) 및 sSOI (strained-si-on-insulator) 기판을 사용한 MOSFET을 통해, strain 효과에 의한 전기적 특성 및 메모리 특성을 평가 하였다. 그 결과 strained-Si층과 relaxed-SiGe층간의 tensile strain에 의한 캐리어 이동도의 증가를 통해, 개선된 전기적 특성 및 메모리 특성을 확인하였다. 또한 채널층의 결함이 적은 sSOI 기판을 사용한 1T-DRAM에서 가장 뛰어난 특성을 보였다.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
• /
• 2003.10a
• /
• pp.176.1-176
• /
• 2003

제주지역 양조산업의 산업화 기술 개발의 일환으로 제주지역의 대표적인 전통 좁쌀 약주 제품에 대하여 유통 과정 중에 발생하는 침전 형성을 방지하는 기술을 개발하기 위하여 여과 공정 개선에 관한 연구를 실시하고 개선 방안을 제시하였다. 각종 공극 크기의 유리 막 여과지와 중공사막 카트리지 여과 연구 결과, 이 좁쌀 약주 제품에서 대부분이 침전 형성 가능한 입자들은 1.2$\mu\textrm{m}$여과 매질 공극 크기에 의한 여과에 의하여 제거 되여 보통의 소비에 문제가 되는 침전은 잘 않되는 것으로 조사되었다. 현재 제품 제조 현장에서 사용되고 있는 l$\mu\textrm{m}$ 공극 크기 원통형 정밀 여과기인 경우 이론적으로는 합당하나 여과 매질에 대한 산업 인 공극 크기에 대한 오차 한계인 $\pm$20-30% 때문에 일부제품에서 침전 발생하는 것으로 분석되었다. 또한 4$^{\circ}C$와 실온을 48시간씩 반복하면서 3개월간 저장 중 유리 막 여과지인 경우는 0.7$\mu\textrm{m}$ 공극크기의 여과에서도 세밀한 관찰에 의하여 침전형성이 관찰되었으나 중공사막인 경우에는 0.45$\mu\textrm{m}$에서도 전연 침전형성이 관찰되지 않았다. 따라서 완벽한 침전 형성 방지를 위해서는 최종 여과공정에 중공사막 여과 시스템 도입이 효과적이며, 설계 기준은 0.45$\mu\textrm{m}$ 공극과 내경 1mm정도의 중공사막을 유효 여과 면적 1$m^2$정도를 가지도록 하는 중공사막 여과 시스템인 경우 여과 능력은 약400ι/hr로 계산되었다.

• Journal of IKEEE
• /
• v.21 no.4
• /
• pp.348-352
• /
• 2017

A lot of researches have done for WSN(Wireless Sensor Networks) authentication. Those are divided by whether using certificates or not for the authentication. In this paper, we proposed certificateless protocol. As simplifying the process of authentication, overall the process become faster and the load of the sensor node is decreased. Using the method we proposed, the energy consumption is decreased. That is because instead using keyed hash authentication code(HMAC) simple one way hash function was used. The study confirmed that it could operate on sensor nodes with extremely limited resources and low processing power.