Implementation of a DBPSK/DQPSK DSSS MODEM ASIC Chip

류수림,장현만,선우명훈 에스케이텔레콤 (주) 1998 Telecommunications Review Vol.8 No.4

This paper presents a high-speed DSSS MODEM ASIC chip for wireless local area network (WLAN). The implemented MODEM chip supports the DSSS physical layer specifications of the IEEE 802.11. The chip supports various data rates, i.e., 4Mbps, 2Mbps and 1Mbps and provides both DBPSK and DQPSK for data modulation. We have simulated algorithm models using the SPWTM and verified the BER performance in AWGN channel environments. Moreover, we have verified the BER performance for the carrier frequency offset and clock offset under the AWGN channel environments. We have simulated the architecture using VHDL models and have performed logic synthesis using the SYNOPSYSTM (v3.4a) Design Analyzer. The chip has been fabricated using the 0.6μm gate array library (KG75), consists of 53,355 gates and operates at 44MHz. The implemented architecture shows lower BER than the Harris HSP3824.

무선 LAN용 직접대역 확산 방식 모뎀 ASIC 구조 설계 ( Design of A High Speed DS-SS Modem ASIC Architecture for Wireless LAN )

류수림,은세영,선우명훈 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.1

무선 LAN용 직접대역확산 방식 모뎀 ASIC 구조 설계 ( Design of a High Speed DS-SS Modem ASIC Architecture for Wireless LAN )

류수림,은세영,선우명훈 한국통신학회 1997 한국통신학회 학술대회논문집 Vol.- No.-

무선 LAN용 직접대역확산 방식 모뎀 AISC 구조 설계

류수림(Surim Ryu),은세영(Se Young Eun),선우 명훈(Myung Hoon Sunwoo) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.1997 No.4

빈부분화 교정의 법제근거와 제도 정립 -- 정체주의 관점을 중심으로

劉水林 부산대학교 중국연구소 2007 Journal of China Studies Vol.3 No.-

무선 LAN용 직접대역확산 방식 모뎀 아키텍쳐 설계

장현만,류수림,선우명훈,Chang, Hyun-Man,Ryu, Su-Rim,Sunwoo, Myung-Hoon 대한전자공학회 1999 電子工學會論文誌, C Vol.c36 No.6

본 논문에서는 무선 LAN 표준안 IEEE 802.11의 직접대역확산(Direct Sequence Spread Spectrum) 물리계층을 지원하는 기저대역 모뎀 ASIC 칩의 아키텍쳐와 설계에 대해 기술한다. 구현된 모뎀 칩은 크게 송신부와 수신부로 구성되어 있으며, CRC 부호화/복호화기, 차동 부호화/복호화기, 주파수 옵셋 보상기(frequency offset compensator) 및 타이밍 복구 회로를 포함한다. 구현된 모뎀 칩은 4, 2 및 1Mbps의 다양한 데이타 전송률을 지원하고, DBPSK와 DQPSK의 변조방식을 사용한다. 구현한 모뎀 아키텍쳐는 $SAMSUNG^{TM}$ $0.6{\mu}m$ 게이트 어레이 라이브러리(gate array library)를 사용하여 논리합성을 수행하였으며, 칩의 전체 게이트 수는 53,355개이다. 칩의 동작 주파수는 44MHz이며, 칩의 패키지는 100-pin QFP이고, 전력소모는 44MHz에서 1.2watt이다. 구현된 모뎀 아키텍쳐는 상용화된 HSP3824 칩 보다 우수한 BER성능을 나타낸다. This paper presents the architecture and design of a DSSS MODEM ASIC chip for wireless local area networks (WLAN). The implemented MODEM chip supports the DSSS physical layer specifications of the IEEE 802.11. The chip consits of a transmitter and a receiver which contain a CRC encoder/decoder, a differential encoder/decoder, a frequency offset compensator and a timing recovery circuit. The chip supports various data rates, i.e., 4,2 and 1Mbps and provides both DBPSK and DQPSK for data modulation. We have performed logic synthesis using the $SAMSUNG^{TM}$ $0.6{\mu}m$ gate array library and the implemented chip consists of 53,355 gates. The MODEM chip operates at 44MHz, the package type is 100-pin QFP and the power consumption is 1.2watt at 44MHz. The implemented MODEM architecture shows lower BER compared with the Harris HSP3824.

The clinical importance of body mass index and related blood markers in the elderly cancer patients

신지헌,손덕승,이수림,원혜성,류시영,양지현,김서리,고윤호 대한내과학회 2019 대한내과학회 추계학술대회 Vol.2019 No.1

고도산화공정인 오존처리에 의한 난분해성 염료 수용액의 분해특성

황세욱,박종환,이수림,엄주현,류성기,최익원,김성헌,강세원,조주식,서동철 한국환경농학회 2020 한국환경농학회지 Vol.39 No.1

BACKGROUND: Most of the researches on the dye removal using ozonation have been focused on the removal efficiency. However, the research on their removal characteristics and mechanism according to the reaction time has been still insufficient. METHODS AND RESULTS: In this study, the effects of initial pH and dye concentration with reaction time on the degradation characteristics of methyl orange (MO) and methylene blue (MB) by ozonation were evaluated. The degradation efficiency of MB by ozonation increased with increasing pH. On the other hand, the degradation efficiency of MO by ozonation did not show a significant difference with varing pH. The both MO and MB by ozonation were decomposed within 30 min irrespective of the dye con-centration, but the decomposition rates of dyes were faster at lower initial dye concentration. The decomposition efficiency of total organic carbon (TOC) in each dye solution by ozonation was low, which was found to be effective for partial decomposition such as decolorization rather than complete degradation of the dye. CONCLUSION: Overall, ozonation was an effective method for removing nondegradable dyes. However, it is necessary to study the optimization of dye degradation under various environmental conditions for ozonation.

고등학교 체육수업에서의 수행평가 적용상 문제점 분석

김이수,김평석,류수림,노덕선 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.2

This study aims to understand and analyze problems on applying performance assessment to physical education in high school, and to offer basic data to seek for measures to settle performance assessment in physical education. The specific themes are, first, we analyze the present condition of reflection of the assessment in physical training. knowledge. and attitude in physical education. Second. we analyze teachers' implementation of performance assessment. Third, we compare the recognition of performance assessment according to students' gender. Fourth, we compare the recognition of performance assessment according to the type of schools. For the research, twelve high schools in the Metropolitan area were randomly selected, and 50 physical education teachers and 305 high school students in third grade were polled. Collected data from teachers were classified by type after frequency study. and the data from the students were analyzed in terms of frequency. by the means of Independent T-test for verification of average deviation between male and female students and by means of one-way ANOVA for analysis of school type-related results. When there was any significant difference among groups, Tukey method was applied for the aftermath verification. The results are as follows. First, the reflection rate of assessment on physical training. knowledge and attitude in physical education was found to be 60: 30: 10. Second, teachers implement physical training assessment mostly in two sports per semester. Most teachers assess focusing on the record (the number of times), and implement the assessment twice per each sport. Classroom assessment and assignment assessment are implemented if required. As for exam questions for knowledge assessment. most teachers gave only multiple-choice type questions. Most teachers also implement knowledge assessment with various other measures such as experiment. drill, physical training test and report. Assessment of attitude is mostly implemented by teachers. They evaluate such factors as uniform, participation, attendance, absence, and lateness. Students' behavior and attitude during classes are also mostly reflected in assessment. 68.8% (thirty three) respondents answered that they evaluated students' attitude every class. Third. as for the awareness of performance assessment according to students' gender, both boys and girls are found to be well aware of the assessment. They showed positive responses toward the number of assessment, fairness and accuracy of self assessment and peer assessment; toward humanistic education and academic achievement which are results of performance assessment, boys showed positive responses whereas girls showed negative ones. Fourth, the comparison of awareness of performance assessment according to school type shows that respondents from all types of boys', girls' and co-ed high schools responded positively, and especially respondents from boys' high school answered more positively. As for the reflection of students' interest on the assessment, respondents from all types of boys', girls', and co-ed high schools responded negatively, and especially respondents from co-ed high schools answered more negatively. Respondents from all types of high school, especially those from girls' high schools answered positively to the question regarding standards, function of performance assessment, appropriateness of reflection rate and the number of assessment of students' knowledge and attitude. With regard to fairness of performance assessment and accuracy of self assessment and peer assessment, respondents from both boys' and girls' high schools answered positively, especially there were more positive answers from girls' high schools. Respondents from boys' and girls' high schools answered more negatively than those from co-ed high schools to the question regarding effectiveness of group assessment in performance assessment. To the question of contribution of performance assessment to humanistic education, respondents from co-ed high schools answered more negatively than those from boys' and girls' high schools. Respondents from boys' and girls' high schools showed positive responses on the contribution of performance assessment to academic achievement, whereas respondents from coeducational high schools showed negative responses. which is statistically significant(F=3.909, p= .021). However, aftermath verification showed that only respondents from boys' and coeducational high schools showed significant difference (p= .020).

부품단종 및 위조부품 관리계획 방안 연구

진희철,김승우,이수림,최재인,윤재복,류서현,장민기 한국품질경영학회 2018 한국품질경영학회 학술대회 Vol.2018 No.-

개발된 무기체계의 총수명주기는 늘어나고 있으나, 전자기술의 급속한 발전 속도에 따라 무기체계 수명주기 내 단종부품과 위조부품이 다수 발생하고 있다. 이는 무기체계 총수명주기 비용 증가를 초래하였고 ‘15년 국방부는 부품단종관리 업무 지시를 하달하게 되었다. 해당 지시에는 국방과 관련하여 사업기관, 개발기관, 시제/양산업체, 품질보증기관, 소요군 등 국방획득과 관련한 대부분의 기관에 역할을 부여하고 있다. 품질보증기관인 국방기술품질원은 부품단종 전문연구기관으로 지정되어 있다. 하지만 해당 지시에는 실제 업무 담당자가 실질적인 도움을 받을 수 있는 업무 방안이 결여되어 실무자가 부품단종과 위보부품관리 업무를 하기 위한 구체적인 도움을 받지 못하여 해당 업무를 구체적으로 수행하지 못하였다. 이에 국방기술품질원은 국외 부품단종 및 위조부품 관리 업무 실태 및 규정을 검토하여 부품단종 및 위조부품관리 업무 요소를 식별하였고 해당 업무를 수행하기 위한 가이드북을 작성하였다. 또한 부품단종 및 위조부품관리 계획서를 작성하기 위한 한국형 부품단종 및 위조부품관리 계획서 표준(안)을 제시하여 개발기관 및 시제/양산업체가 관련 업무 계획서 작성 시 도움이 될 수 있도록 하였다.