• Journal of Satellite, Information and Communications
• /
• v.12 no.2
• /
• pp.83-88
• /
• 2017

In this paper, we propose a three-element CRPA array with improved low-elevation gain. The proposed antenna consists of a feed patch and a radiating patch, and the feed patch is connected by a coaxial cable. The radiating patch is electromagnetically coupled to the feed patch, which allows to improve the low-elevation gain of the antenna. To demonstrate the suitability of the proposed antenna, the antenna characteristics are measured in a full anechoic chamber. The resulting bore-sight gain is 2.8 dBic with an axial ratio of 2.7 dB, and the average gain at the low-elevation direction of $75^{\circ}$ is -1.4 dBic. The results verify that the proposed antenna is suitable for CRPA arrays with anti-jamming capability.

• 한국정보통신설비학회:학술대회논문집
• /
• 2008.08a
• /
• pp.368-371
• /
• 2008

홈 네트워크내에서 Always-on 기기 특성으로 인하여 불필요한 에너지를 소비하는 경우가 전체 소모전력량의 60%이상을 차지한다. 그러므로 이러한 에너지 소비를 줄일 수 있는 방안에 대한 연구의 필요성이 점차 증대되고 있으며, 본고에서 연구한 Ethement 기반의 트래픽량에 의한 대기모드 전환 알고리즘은 에너지 절감에 매우 유용한 연구기술이라 할 수 있다. 이에, 본고에서는 idle time때의 네트워크 에너지 소비를 절감하기 위한 대기전력 지원형 Green Ethernet Gateway시스템설계 및 구현방안과 시스템 대기모드상태를 최대한 연장하여 energy efficient효과를 향상시키기 위한 Proxying 기반 control policy를 제안한다. 일반적으로 홈네트워크의 네트워크 연결은 ethemet을 중심으로 이루어지며, 대부분 게이트웨이를 기반으로 그 연결이 구성된다. 그러나 홈네트워크의 일반적인 동작시간이 8시간 내외인데도 불구하고, 네트워크 연결을 위해서 full Power 상태를 유지해야하는 기존의 energy unaware기반의 게이트웨이 구조로는 에너지측면에서 막대한 에너지 낭비를 초래한다. 이에 본고에서는 게이트웨이에서의 에너지 절감을 위한 트래픽량 기반의 대기모드 지원형 시스템을 구현하고 실제 홈네트워크 적용을 통한 에너지 절약효과를 실험한다. 또한 활성모드, 대기모드간 전환을 효과적으로 하기 위한 layer 2,3 Packe기반의 지능형 Proxying 알고리즘을 이용한 control policy를 제안한다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.4
• /
• pp.1889-1896
• /
• 2011

There has been a lot of researches to develop techniques that provide redundant paths, there by making Multistage Interconnection Networks(MINs) fault tolerant. So far, the redundant paths in MINs have been realized by adding additional hardware such as extra stages or duplicated data links. This paper presents a new MIN topology called Hierarchical MIN. The proposed MIN is constructed with 2.5N-4 switching elements, which are much fewer than that of the classical MINs. Even though there are fewer hardware than the classical MINs, the HMIN possesses the property of full access and also provides alternative paths for the fault tolerant. Furthermore, since there is the short cut in HMIN for the localized communication, it takes advantage of exploiting the locality of reference in multiprocessor systems. Its performance under varying degrees of localized communication is analysed and simulated.

• The KIPS Transactions:PartA
• /
• v.14A no.3 s.107
• /
• pp.147-150
• /
• 2007

This paper describes a new low-swing inverter for low power consumption. To reduce a power consumption, an output voltage swing is in the range from 0 to VDD-2VTH. This can be done by the inverter structure that allow a full swing or a swing on its input terminal without leakage current. Using this low-swing voltage technology, we proposed a low-power 16$\times$16 bit parallel multiplier. The proposed circuits are designed with Samsung 0.35$\mu$m standard CMOS process at a 3.3V supply voltage. The validity and effectiveness are verified through the HSPICE simulation.. Compared to the previous works, this circuit can reduce the power consumption rate of 17.3% and the power-delay product of 16.5%.

• The KIPS Transactions:PartA
• /
• v.12A no.4 s.94
• /
• pp.297-304
• /
• 2005

This paper proposes DAMQWR and VCDAMQ architectures that enloit the full capabilities of adaptive routing. DAMQWR enables messages in congested channels to route through non-congested channels by using recruit registers while VCDAMQ dynamically assigns resources among virtual channels, resulting in better network traffic control. Through extensive simulations and analysis, this paper evaluates their effects on overall network cost and performance. These proposed queue architectures, VCDAMQ and DAMQWR are shown to appropriately support adaptive routing capability by dynamically and efficiently managing queue and network resources, increasing network performance. The results show that up to $20\%$ higher throughput can be obtained in comparison to traditional DAMQ designs.

• The KIPS Transactions:PartC
• /
• v.9C no.5
• /
• pp.743-748
• /
• 2002

In recent research for the Internet, many studies have investigated the Diffserv AS architecture that can provide Quality of Service. However, this architecture still lacks the qualification to provide full use of the bandwidth to the customer In this paper, we propose the TS2W3C (Time Sliding Two Window Three Color) marking algorithm to improve the fair share of bandwidth by enhancing the TSW (Time Sliding Window) marking algorithm. Our proposed mechanism provides the bandwidth relatively more fairly than the TSW mechanism.

• The KIPS Transactions:PartB
• /
• v.10B no.1
• /
• pp.81-86
• /
• 2003

In this paper, we propose the tracking method of moving object which use extracted object by difference between background image and target image in fixed domain. As a extraction method of object, calculate not pixel of full image but predefined some edge pixel of image to get a position of new object. Since the center area Is excluded from calculation, the extraction time is efficiently reduced. To extract object in the predefined area, get a starting point in advance and then extract size of width and height of object. Central coordinate is used to track moved object.

• Proceedings of the Korean Institute of Interior Design Conference
• /
• 2005.10a
• /
• pp.85-89
• /
• 2005

Within a short period of time of evangelical activities in Korea, the Korean Christianity has been explosively grown since 1884. Now Korea became one of the top countries exporting many missionaries to other countries. We call the 1970s and after as the time of diversity in Korean churches and those buildings. In this period, Korean churches have grown larger and bigger, so called mega-churches. Including Yoido Full Gospel Church, Seoul with 10,000 seats, there are 22 mega-churches in Korea out of the world top 50 mega-churches. Having the necessity of knowing the composition of worship space of mega- or super-mega-churches, we analyzed and classified the information of mega-churches which were built after 1970s. We collected resources through blueprints, visitations of buildings, and interviews by phone, For this study and research, we selected total 66 churches. Based upon the existing theories, we categorized the plane of worship space, its axis, the arrangement of attendant seats, the location of the choir, and the pattern of a cross section of buildings. We also brought the conclusion of specific characteristics given through the analysis according to the time period, the style, and the denomination of megachurches.

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.21 no.7
• /
• pp.629-636
• /
• 2011

In this study, survey experiment and EEG test was carried out to know the effect of visual images on EEG for evaluating words of soundscape sound source with 18 subjects. Analysis on the EEG were executed to know the difference according to with and without visual images. Followings are results of this study. 1) There is no big difference with visual images in soundscape sound evaluating adjectives such as "Full", "Clear", "Enjoyable" whereas there is a big difference in soundscape sound evaluating adjectives such as "Pleasant", "Comfortable", "Gentle", "Sonorous". 2) There is a tendency that soundscape sound source which is consist of single sound source shows + 1 above increase in survey test when visual image is suggested whereas soundscape sound source which is consist of one more sound source shows - 1 below decrease in survey test. 3) Statistical analysis was used to know considerable probability. ${\alpha}$-wave has a considerable probability and Maximum level difference occurring brain spots were number 1 and 2.

• Journal of Oriental Neuropsychiatry
• /
• v.19 no.1
• /
• pp.97-105
• /
• 2008

Objective : The objective of this study is to investigate the intellectual characteristics of the specific language impairment(SLI) and the borderline intelligence-language disorder (BI-LD). Method : 30 Children participated in this study, IS children with SLI(K-WISC-ill FIQ above 85, Test of Problem Solving score below -1.25SD, verbal comprehension factor index of K-WISC III below 80), 14 children with BI-LD(K-WISC-ill FIQ $70^{\sim}85$, Test of Problem Solving score below -1.25SD, verbal comprehension factor index of K-WISC III below 80). All students were evaluated with K-WISC III, Test of Problem Solving. full-scale IQ (FSIQ), \ verbal intelligence quotient (VIQ), Verbal Comprehension Index, and Test of Problem Solving score were compared between two groups. Result : All subtests scores of PIQ in the SLI were significantly higher than those in the BI-LD. there was no significant difference in the subtests scores of VIQ. In the VIQ subtests, Information, Arithmetic, Comprehension score were higher in the SLI compared to the BI-LD, but the score of Similarities and Vocabulary were similar between two groups. Conclusion: These results suggest that inspite of the difference of PIQ, SLI and BI-LD have similar language abilities, and there are some different intellectual characteristics between SLI and BI-LD