부산지역 강하먼지 중 불용성 중금속 함유량

이용범,황용식,이창희,박명희,이채관,강동묵,김정원,전병일,문덕환 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.1

■ Objectives The purpose of this study was to estimate qualitatively various bulk deposition flux of insoluble heavy metal components by applying regional and seasonal distribution. our institution from January 1980 to December 31th, 2001. ■ Materials and Methods Dustfall particles were collected by the modified American dust jar (wide inlet bottle type) at 6 sampling sites in Pusan area from March, 1999 to February, 2000. Five chemical species (Cd, Cr, Mn, Ni and Pb) were analyzed by AAS(Perkin-Elmer 4100ZL). ■ Results The mean values of each heavy metal concentrations were Cd for 3.947 g/㎢/month, Cr for 0.191 ㎏/㎢/month, Mn for 0.375 ㎏/㎢/month, Ni for 0.176 ㎏/㎢/month, and Pb for 0.823 ㎏/㎢/month. ■ Conclusions Insoluble heavy metal amount of regional variations were found in order of industrial zone, coastal zone, commercial zone, agricultural zone and residential zone.

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

내시경적 점막절제술로 치험한 식도 과립상 세포종 1례

강혁주,김성욱,최석진,이중현,장재식,서영범,윤병구,박건욱,김성자,김용섭,강승완,이구,양창헌,이창우,김욱년,이광헌,서정일 동국대학교 의학연구소 2000 東國醫學 Vol.7 No.-

과립상 세포종은 Schwann 세포 기원으로 생각되며 인체에 비교적 드물게 발생한다. 과립상 세포종은 전신 어느 곳에서나 발견될 수 있으나 주로 혀, 구강, 피부 혹은 유방 등에서 호발하며 드물게 위장관에서 발견된다. 위장관에서는 식도에서 가장 호발하며 다음으로 위, 대장 순이다. 과립상 세포종은 대부분, 특히 위장관에서는 양성이며 소수의 악성 병변이 보고되었다. 이러한 이유와 함께 수술 전의 진단이 어렵기 때문에 과립상 세포종에 대한 근본적인 치료는 현재까지 외과적 절제술이다. 최근에 시도되는 치료방법들로는 내시경적 레이저 치료, 용종절제술, 내시경적 점막 절제술 등이 있다. 저자들은 상부 소화관 내시경검사를 시행하여 식도 과립상 세포종을 진단하고 내시경적 점막 절제술을 시행하여 합병증 없이 퇴원하여 현재 재발없이 경과 관찰중인 1례를 경험하였기에 보고하는 바이다. Granular cell tumors, which occur infrequently, are probably of Schwann cell origin. They can occur almost anywhere in the body but usually affect the tongue, oral cavity, skin, or breasts and are rarely found in the gastrointestinal tracts. The esophagus is the most frequent gastrointestinal site, followed by the stomach and the colon. Granular cell tumors are generally benign, especially in the gastrointestinal tract, some malignant lesions have been reported. For this reason, and also because preoperative diagnosis is difficult, the standard treatment for granular cell tumor has until now been surgical excision. In recent years, other therapeutic methods is endoscopic laser therapy (ELT), polypectiomy, endoscopic mucosal resection (EMR). We report a case of esophageal granular cell tumor which was diagnosed by an endoscopy and managed using an endoscopic mucosal resection without complication.

전류 모드 CMOS 다치 논리 회로를 이용한 8X8 병렬 승산기

이용섭,곽철호,김정범 강원대학교 정보통신연구소 2001 정보통신논문지 Vol.5 No.-

This paper presents new current-mode CMOS multiple-valued integrated circuits for high-density arithmetic systems. The validity and effectiveness of the proposed circuits are verified through the HSPICE simulation. A 8×8-bit parallel multiplier using the proposed circuits with 2V supply voltage is designed with a 0.25㎛ standard CMOS technology. The performance of the proposed multiplier is evaluated to be about 74% smaller than that of a corresponding binary implementation.

밭농업 기계화율 상승 방안

이용범 · 노현권 忠北大學校 農業科學硏究所 2018 農業科學硏究 Vol.34 No.2

본문 참고

Kohonen의 자율 학습 신경망칩을 위한 OTA 곱셈기와 수정된 Gilbert 곱셈기의 비교

이상범,조용범 건국대학교 1995 學術誌 Vol.39 No.2

This paper compares characteristics of OTA multiplier and the modified Gilbert multiplier for neural chips of Kohonen's SOM algorithm. To design neural chip, it is necessary to reduce the size of circuits because a massive number of imterconnectlons between neurons are used. For the comparision, the performance of two multipliers was tested by SPICE circuit simulations. OTA multiplier has approximately a half size of the modified Gilbert multiplier. OTA multiplier also has wider operation range from -4.8V to 4.8V compared with the modified Gilbert multiplier ranging from -0.5V to 0.5V. Test spice cells for OTA multiplier-based neural processor and the modified Gilbert multiplier-based neural processor were also desgined and tested for comparisons. The entire operation speed of test slice cells was that OTA multiplier - based neural processor had 27ns rising time and 55ns failing time, and the modified Gilbert multiplier-based neural processor had 53ns rising time and 60ns falling time. The proposed OTA multiplier can be used for highspeed and high integrated applications.

고추, 포도 및 사과에서 분리한 탄저병균(Colletotrichum gloeosporioides)의 특징과 병원학적 연구

李斗珩,李龍範 서울市立大學校 1989 論文集 Vol.23 No.-

Three species of Colletotrichum Corda and Glomerella cingulata(Stonem). Spauld. & v.Schr. known to cause ripe fruit rots of apple, peach and pepper in Korea are compared with respect to culture characteristics, morphology, temperature reactions and pathogenicity determined by field collection and artificial inoculation. The following 4 species and 3 strains of anthracnose fungi reconized : C. coccodes (Wallr). Hughes, C. dematium (Pers. ex Fr.)Grove, C. gloeosporioides(Penz.) Sacc. G, chromogenic, and non-chromogenic strain and G. cingulata. The characteristic features of these organisms are discussed and on the evidence available it is found desirable to designate a new form of C. gloeosporioides or new species of Colletotrichum. It appears that the differences in virulence is not only among the different species of Colletotrichum and G. cingulata but also between isolates of the same species. C. dematium, G. gloeosporioides and G. cingulata are detected in seed samples of red pepper (Capsicum annuum) and C. gloeosporioides are the predominant species in seeds of red pepper which are naturally infected with anthracnose in field conditions. Plating of seed components showed that three species of anthracnose fungi are detected from seed coat, endosperm and plumule bud. C. dematium, C. gloeosporioides and G. cingulata caused seed rot, damping-off and seedling blight. In the effect of some fungicides to C. dematium and C. gloeosporioides on red pepper, Difolatan was the most effective to the fruit rot followed by Orthocide and Phaltan.

養液栽培用 암면(Rockwool)의 物理化學的 特性과 오이 生育에 대한 影響

李龍範,韓東旭 서울市立大學校 1988 論文集 Vol.22 No.-

The growing medium rockwool was produced at rockwool factroioes in 1986. Rockwool for hydroponics is a water absorbent mineral wool product which is produced as a granulate, as growing blocks, and growing slabs. So, these experiments were made to clarify the physical and chemical charateristics of rockwool and to determine the suitability of hydroponics for commercial horticultural crop production. The rockwool product with a density of 80㎏/㎡ consist of 3% solids and 97% pores. Chemical composition of rockwool are Silicon(49%), Calcium(21%), Aluminum(13%), Magnecium(7%), Ferrous(5%), Manganese(1%), and other elements(3%). The pH of the rockwool varies from neutral to slightly alkaline with increasing temperature. The EC of the rockwool varies from 30 μS/cm with increasing temperature. Mineral saltls, calcium and ferrous, are very slightly released from rockwool. In rockwool culture, cucumber was showed to prosperous growth and high yield.

팥바구미 저항성 녹두의 작물학적 특성

이구환,정승근,박상일,송범헌,조용구,김홍식 忠北大學校 農業科學硏究所 2002 農業科學硏究 Vol.19 No.-

Sn-3.5wt%Ag 무연솔더를 이용한 μBGA 솔더접합부의 열피로수명 예측

이준환,하범용,신영의 중앙대학교 기술과학연구소 2000 기술과학연구소 논문집 Vol.30 No.-

본 연구에서는 μBGA와 Pb-free 솔더에 대한 수명평가방법을 제시하기 위하여 μBGA에 대하여 37wt%Pb-Sn 공정 솔더와 Sn-3.5wt%Ag 솔더를 채택한 3차원 유한요소해석모델을 구성해 보았다. 점탄소성거동에 대비하여 구성되어진 각각의 모델 중, 먼저 일반적인 솔더 형상을 가진 모델에 대하여 솔더 재질별로 온도범위 -40∼120℃, -20∼100℃, 20∼100℃의 세 가지 열사이클을 3회씩 가하여 솔더 접합부 계면에 집중되어진 응력과 변형율의 분포를 유한요소해석을 통해 살펴보았다. 또한 온도 변화에 따른 ΔT와 용융온도 T_M등의 변수를 이용하여 얻어진 γ를 이용하여 열피로수명식을 유도하였다. This study discusses thermal fatigue prediction of μBGA(Micro Ball Array) solder joint. Analysis method is used to three-dimensional finite element analysis with various solder alloys such as Sn-37wt%Pb, Sn-3.5wt%Ag under temperature cycling. Strain values, along with the result of solder material fatigue tests, were then used to predict the solder joint fatigue life with Coffin-Manson equation. As a result, it could be found that Sn-3.5wt%Ag has longer fatigue life than Sn-37wt%Pb in Low cycle fatigue. And using the analysis result, derive modified Coffin-Manson equation with temperature dependent factor γ.