와이브로 모뎀을 위한 터보 디코더의 VHDL구현

공현섭,김진상,조원경 경희-다반 ASIC 설계교육센터 2006 경희-다반 ASIC센터 논문집 Vol.7 No.-

현재 이동 전화 및 무선 LAN을 이웅하여 휴대인터넷을 즐기는 사용자가 많다. 하지만 이동전화는 이동성은 좋지만 전송속도가 느리고 무선 LAN은 전송속도는 좋으나 이동성이 나쁜 한계가 있다. 이런 단점을 극복하고자 나온 것이 WiBro이다. WiBro는 Wireless Broadband Internet의 줄임말로 IEEE 802.16e에 기반을 둔 한국 표준이다. WiBro에서는 60km/h의 속도로 1Mbps 이상의 전송 속도가 요구되므로 channel 특성에 강한 ECC (Error Correcting Code)가 중요핟. 이에 WiBro에서는 Convolution Turbo Code (CTC)를 사용하고 있으며, Hybrid-ARQ와 같은 유동적 재전송 Code를 사용한다. 본 논문에서는 이러한 강력한 Channel Codec과 TDD 방식의 WiBro 규격을 만족하기 위해서 기존의 Max-Log-MAP algorithm을 변형하여, H/W의 복잡도를 줄이고, Low power을 가능하게 하는 구조를 제안한다.

18개월 유아의 S. mutans와 Lactobacillus 감염수준과 우식위험요인의 상관성에 관한 연구

안진공,정진,정태성,김신 대한소아치과학회 2006 大韓小兒齒科學會誌 Vol.33 No.3

학습자의 평가 참여를 지원하는 웹 기반 수행평가 시스템의 설계 및 구현

강공미,김진호 한국컴퓨터교육학회 2003 컴퓨터교육학회 논문지 Vol.6 No.3

수행평가는 학생들의 학습 과정을 관찰하거나 학생들이 산출해 낸 자료를 통해 평가하는 방식으로 단순 필답 고사의 단점을 보완하는 새로운 평가 방식으로 주목받고 있다. 그러나 이 수행평가를 적용하는데 많은 노력과 시간 부담이 들어 실제 학교 현장에서 시행에 많은 어려움을 겪고 있다. 이러한 부담을 줄이기 위해 인터넷을 이용한 평가가 다방면에서 시도되고 있으나, 이들 기존 연구에서는 학생의 평가 참여가 허용되지 못하며 평가 방법이 다양하지 못하거나 교사의 피드백이 부분적으로만 사용되는 문제점을 가지고 있다. 따라서 본 논문에서는 학습자들의 평가 참여 및 학습 과정 중의 다양한 수행평가를 지원하고 교사가 효과적으로 관리할 수 있는 웹 기반의 수행평가 시스템을 설계하고 구현하였다. 이러한 웹 기반 수행평가 시스템을 활용할 경우, 학생들의 평가력 등의 고등사고 능력과 전인적 발달을 도모하고, 수행평가를 위한 교사의 업무와 시간 부담을 대폭 줄일수 있을 것이다. A performance evaluation, which requires to observe students in the course of teaming and studying and to evaluate their reports and materials, is emerging as an alternative evaluation method to overcome the shortcoming of simple written tests. However, there are many difficulties in real teaching setting to apply the performance evaluation, because it requires many burdens of efforts and time. In order to reduce these burdens of teachers, there have been several approaches which utilize the Internet for the evaluation. But these previous approaches have several limitations that they don’t allow students’ participation in evaluation activities, fail to provide a variety of evaluation methods, and/or support teachers’ feedbacks very limitedly. In order to overcome these limitations, therefore, this paper designed and implemented a web-based performance evaluation system supporting the participation of students in doing evaluation themselves and various evaluation methods, which can be effectively managed by teachers. This web-based performance evaluation system developed in this paper can enhance not only students’ high level thinking abilities but also their emotional and intellectual abilities. It can also help teachers to reduce the burden of working and the time in plenty used for evaluating students.

文革 시기의 문예 출판 동향

김진공 한국중국어문학회 2001 中國文學 Vol.35 No.-

本液文旨在遲逑牙於文革財期文亐出版狀況的分析, 具沐植消文革的業隋雇뀨逑程. 文革財期出版狀況的麥化是政治情勢査化臺接影晴到裡力的政榮而形成的. 所띨 宣是淡明文革雇汗逑程的業讀猜料. 종66年文革뀨賠到69年知涓辯年上山下多和堂딘兵遠刻的賠束, 文訖出版領域出琨了全遼否定的局面, 全面停止鎭刊的裳行和文亐作品的出版. 逑洋的狀況就是相鹿於文革高潮期根左形勢.70-71年是麥化的讀醮期. 72年後出版狀況的裵化泰面化了. 首先뀨賠文革以前出版物的再出版,包括魯迅的作品. 然後』坪출逃作家的作品刻作和出版. 述洋的解禁措施表明文革的淺行面悟橋本性特姿. 允其是74年後的出版狀況, 豫示了帳劉文革的培束.

CVM에 의한 친환경농업의 비시장적 가치평가 : 충북 도시 소비자 조사를 중심으로

유진채,공기서 한국농업정책학회, 한국축산경영학회 2001 농업경영정책연구 Vol.28 No.2

Interests in agri-environmental farming products are increasing due to increase in national income and the aggravating effects of various kinds of pollution. Even though, currently, consumers mistrust agri-environmental farming product authenticated by farmhouses or subsidized by the government, demand for these types of products continues to increase in spite of recognition of environmental problems. Questionnaire of this study was surveyed 360 consumers in Cheongju City located in the Chungbuk Province to determine consumers' recognition of agriculture, their willingness to pay environmental pollution fees, and their awareness of the public goods value of agriculture through the CVM.

폴리우레탄섬유의 加工條件이 收縮率에 미치는 影響

朴炳基,金公朱,任珍模 全北大學校 1981 論文集 Vol.23 No.-

Polyurethane has several advantages in stretch fabric applications and it's use has now expanded into many other knitting area. Elasticity and recovery from stretch are the most important properties of polyurethane fiber. So, it is the purpose of this paper to find out the shrinking effect under various conditions of treatments.

근거리 수치사진측량의 정확도 향상에 관한 연구

박운용,김진수,정공운 동아대학교 건설기술연구소 2003 硏究報告 Vol.27 No.1

As state-of-the-art usually high-quality digital cameras are used for photogrammetric industrial metrology. Digital high-resolution consumer cameras are widely available. and are increasingly used in close-range photogrammetry. The mechanical construction of the cameras often do not meet photogrammetric requirements, thus they have to be modelled sufficiently. The close-range photogrammetry is a surveying technique the acquiring the 3D object from 2D geometric appearance shown in the image. Camera treatment is relatively so simple. Camera position refer to the object can be freely adjusted by locating the exposure station at any site. So it is used effectively a small area or object for survey. In this study, suing the digital camera which has capacity of keeping numerical value by itself and easy carrying, we analyze the positioning error according to various change of photographing condition. Also we try to find effective method of acquiring basis data for 3D monitoring of high-accuracy in sub-pixel degree through digital close-range photogrammetry with bundle adjustment for local terrain model generation.

정신박약아의 사회경제적 배경 및 가정구강 보건행동에 다른 우식상태의 비교 연구

김신,안진공 大韓小兒齒科學會 1992 大韓小兒齒科學會誌 Vol.19 No.1

For the purpose of analyzing the influence of socioeconomic backgrounds and home dental behaviour on the caries experience of mentally retarded children, 82(51 boys and 31 girls) mentally retarded schoolchildren in Pusan area were inspected for their oral hygienic state and their mothers were interviewed with questionnaires. The following results were obtained. 1. There showed lower distribution of H-caries group when their mothers were highly educated and had no job, and their families were in higher economic group. 2. The frequency of toothbrushing and between-meals were shown to have no significant influence on the distribution of H-caries group. 3. The types of between-meals and the subject of toothbrushing were shown to have influence on the distribution of H-caries group.

Characteristics of Gas- and Particle-phase Acids and NH₃at Urban and Rural Sites in Korea

Chang-Jin Ma(Chang-Jin Ma),Hui-Kang Kim(Hui-Kang Kim),Gong-Unn Kang(Gong-Unn Kang),Susumu Tohno(Susumu Tohno),Mikio Kasahara(Mikio Kasahara) 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.E1

To study the characteristics of ammonia and the related compounds, atmospheric aerosols and gases were collected using a triple filter pack sampler, a low volume air sampler, and a three-stage Andersen air sampler in Seoul and Kangwha Island, Korea from Dec. 1996 to Oct. 1997. Ammonia concentrations showed approximately two times higher in summer than in winter at both sites. The highest HNO₃ levels were generally observed in summertime at two sampling sites. The average mass concentration of PM_2.5 in heavily industrialized Seoul was about three times higher than that of Kangwha. In winter, the sum of NH₄^+ and its counter ions (such as CI^-, NO₃^-, and S0₄²^-) comprised 30-41% of PM_2.5 mass concentration at each sampling site. Temperature dependence of particulate nitrate was examined at the urban sampling site. The formation of the nitrate in the fine mode was dependent not only on the amount of precursors but also on the variation of temperature. (NH₄)S0₄and NH₄HS0₄coexisted with NH₄NO₃and NH₄Cl at each site. According to the summertime backward trajectory analysis. NO₃- showed higher level with air parcels transported from northeast Asian continent. On the other hand, the concentration of SO₄²- showed significantly higher level when air masses originated from Pacific Ocean, southern part of Japan. and Korea.

An Experimental Estimation of Two Detection Limit Models

Chang-Jin Ma(Chang-Jin Ma),Susumu Tohno(Susumu Tohno),Mikio Kasahara(Mikio Kasahara),Gong-Unn Kang(Gong-Unn Kang) 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.E1

In environmental studies, decisions are often made on the analytical data indicating certain contaminants as being "detected" or "non-detectible." Since detection limits are analytical method specific, one has to first review the concepts and definitions associated with analytical method systems and specifications. In this study, the experimental analytical values for a series of low level standards (for an ionic species) were used as an example to estimate two different method detection limits (MDL). The scores of EPA's MOL and Pallesen's MDL determined by real analytical scores are 0.0575 and 0.0561 mg/L, respectively for our nitrate data. These scores determined by two different MDL models are roughly similar, while there are apparent differences between two methods with respect to statistical and systematical procedure. However, detennination of MDL for one's laboratory provides some practical applications which helps to assure one's regulating authorities that one's measured scores are accurate.