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국제인쇄산업대전 - "한국 인쇄산업의 동향과 수출전략"
김남수,Kim, Nam-Su 대한인쇄문화협회 2011 프린팅코리아 Vol.10 No.11
한국인쇄산업은 전반적으로 외형의 감소세를 보이고 있다. 이는 수년째 사업체수 및 종사자수가 감소한데 따른 것이다. 이에 비해 인쇄시설의 고급화와 IT시대를 맞아 자연스러운 구조조정이 진행된 결과로 출하액과 부가가치는 지속적인 증가세를 보이고 있다. 국제인쇄포럼에서 김남수 대한인쇄문화협회 회장이 발표한 내용을 요약 정리한다.
다수의 나카가미(nakagami) 페이딩을 받은 AMPS 간섭파가 불완전 전력제어된 DS/CDMA 시스템의 용량에 미치는 영향
김남수 한국통신학회 1996 韓國通信學會論文誌 Vol.21 No.12
We analyze the capacity of the imperfect power controlled DS/CDMA system with the Nakagami faded AMPS interferers by means of the analytical approach. Unlike the theoretical aassumption, the power control of the DS/CDMA system is not perfect. Therefore in this analysis we consider various parameters which cause the capacityreduction of the DS/CDMA system, the imperfect power control, the Nakagami fading index, he processing gain, and the number of AMPS interferers. The analytical results are compared with the Prasad's results which are considered only the imperfect power control of the DS/CDMA system. It is shown that the DS/CDMA capacity is decreased according to the increase of the deviation of the imperfect power control, to icrease the number pf the analog interfering users, and to decrease the processing gain.
퇴직한 납 취급 근로자들에서 골밀도 저하와 경골납량이 혈중납량에 미치는 영향
김남수,김진호,김화성,김희선,이성수,Andrew C. Todd,이병국 한국산업보건학회 2006 한국산업보건학회지 Vol.16 No.4
This study was designed to investigate the effect of bone demineralization and tibia lead on blood lead in retired lead workers. Two hundred thirty five(126 females and 109 males) retired lead workers who worked in 4 different lead factories and 101 non-occupationally lead exposed subjects(51 females and 51 males) were recruited from March 2004 to October 2004. Bone mineral density(BMD) was measured at left calcaneous bone area by broadband ultrasound attenuation(BUA) method with QUS-2(Metra Biosystems Inc, USA). The BUA value transformed into T-score by WHO standard conversion criteria. Tibia bone lead was measured for skeletal bone lead with K-xray fluorescence(K-XRF) and blood lead was analyzed with flameless atomic spectrophotometer. Hemoglobin, hematocrit, serum calcium and iron were also analyzed. In addition, information for smoking and drinking status and basic personal data such as age, gender and lead exposure were also collected using questionnaire inquiry. Blood lead was correlated with tibia lead (r=0.664) and these two variables were negatively correlated with BMD in bivariate analysis. BMD showed significant main effect on the change of blood lead independent to tibia lead without any effect modification of age or gender; the one T-score unit decrease of mineral bone density made 0.43㎍/㎗ increase of blood lead. On the other hand, tibia lead showed effect modification with gender on blood lead; the slope of tibia lead on blood lead in male was steeper than in female and crossed at around zero of tibia lead. In the multiple regression analysis of blood lead and tibia lead on BMD after adjustment of related covariates, only blood lead showed statistically significant effect on BMD. This study confirmed that BMD and blood lead were significantly associated. To verify the causal association of BMD on blood lead and vice versa, further longitudinal studies are needed.
디지털 이동통신 시스템에서 데이터 타이밍 오차와 수신 대역 필터에 의한 성능 열화
김남수 한국통신학회 1993 韓國通信學會論文誌 Vol.18 No.10
본 논문에서는 이동통신 시스템을 분석할때 이론적 해석을 간단히 하기위하여 이상적이라고 가정하였던 수신대역 통과 필터의 진폭 및 위상 특성에 의한 신호의 왜곡과 데이타 샘플링 타이밍오차에 의한 성능저하를 분석하였다. 잘 알려진 심볼간 간섭이론을 이용하면 시스템 오율의 상한(Upper bound)만을 알 수 있다. 따라서, 평균 오율을 계산하기위하여 평균 심볼간 간섭량을 계산하고 이로부터 평균 오율을 계산하는 방법을 제안하였다. 제안한 방법은 컴퓨터 시뮬레이션에 의하여 평균 오율을 계산할 수 있을뿐만 아니라 측정 한 간섭 량을 대 입 하여도 오율을 알 수 있으므로 실험실에 서 쉽게 이용이 가능하다. In this paper, the performance degradation caused by the band pass filter and the data sampling timing error which are generally considered ideal for the simplicity was analyzed. The well known intersymbol interference theory can be applicable to calculate only the upper bound of a system performance. Therefore to obtain the average error probability, a method average intersymbol interference was proposed. This method can be applicable to obtain average error probablity with a computer simulation and with a measured value in test lab. easily.