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황성만,이승기,권순홍,유선대 공주대학교 자원과학연구소 2000 資源科學硏究論文集 Vol.8 No.-
The actual state of using, purchasing of combines have been investigated among the farmers who possess the three row and four row type combines of self thresher in Chung-Nam Province to present reasonable maintenance and utilization of combines. And then the condensed results are as follows. 1. It was found that 25.9% of surveyed farmhouses cultivated rice over 4.5ha which brings average income presented by the Department of Agriculture and Forestry. And 85.2% of farm houses had higher income than the national average 23,488,000 won in 1997. 2. It was surveyed that the working hours a day and working days a year are 9.26 hours and 19.2 days. And they have the charge of 22.8ha a year. 3. It was shown that the most frequent breakdowns happened to pretreating and reaping in 44.4% and the frequency of the annual repair and maintenance is 4.1 times. And they think the endurance years of 6.5 is proper. 4. It was surveyed that 33.3% of the farmers were motivated to buy combines for their own management and supporting others, 22.2% for the difficulties of timing, 9.3% of them for the possibility of purchasing in cheap price. 5. It was found that when they decided to buy combines, 61.1% of farm houses had experiences of analyzing for their management and 38.9% of them didn't. Also the more combines they purchase, the larger and higher qualities of combines they tend to choose. 6. It was shown that 25.9% of surveyed farmers were satisfied with their combines and 74.1% of them weren't. 47.5% of dissatisfaction resulted from high price, 27.5% from frequent breakdowns, 12.5% from rough after service. 7. I think it is necessary for the related authorities to give public information and education for maintenance, management analysis, keeping of combines to make farmers purchase and use them reasonably. Also overall supporting policies are needed for research and development of highly efficient combines and the ways of securing cultivating areas with the spread of large size combines.
8.3% Carbamide Peroxide 함유 펜 형 자가미백제인 BIancTis Forte의 색조개선 및 안전성에 관한 임상연구
이진경,민선홍,홍성태,오소람,정신혜,황영혜,유성엽,배광식,백승호,이우철,손원준,금기연 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.2
This clinical study evaluated the whitening effect and safety of polymer based-pen type BlancTis Forte(NIBEC) containing 8.3% carbamide peroxide. Twenty volunteers used the BlancTis Forte whitening agent for 2 hours twice a day for 4 weeks As a control. Whitening Effect Pen (LG) containing 3% hydrogen peroxide was used by 20 volunteers using the same protocol. The change in shade (ΔE^(*) color difference) was measured using Shadepilot™ (DeguDent) before, during and after bleaching (2 weeks, 4 weeks and postbleaching 4 weeks). A clinical examination for any side effects (tooth hypersensitivity or soft tissue complications) was also performed at each check-up. The following results were obtained. 1 Both the experimental and control groups displayed a noticeable change in shade (ΔE) of over 2 No significant differences were found between the two group (p>0.05) implying that the two agents have a similar whitening effect. 2 The whitening effect was mainly due to changes in a and b values rather than in L value (brightness). The experimental group showed a significantly higher change in b value thus yellow shade than the control(p < 0.05) 3 None of the participants complained of tooth hypersensitivity or soft tissue complications confirming the safety of both whitening agents 8.3%의 carbamide peroxide를 함유한 펜형 코팅용 미백제인 BlancTis Forte (NIBEC, Seosul & JinCheon)를 실험군으로, 3% hydrogen peroxide를 함유한글 Whitening Effect Pen (LG. Seoul) 제재를 대조군으로 각각 피험자 20명에게 2시간씩 1일 2회 제조사의 지시대로 치아표면에 4주간 적용하도록 지시하고 색조개선 효능과 안전성을 평가하였다. 미백 효과는 미백 전 및 미백 2주, 4주 및 미백 종료 4주 후에 Shadopilot™을 이용하여 색 변화를 측정하였고, 매 내원시기마다 모든 환자는 치수생활력 검사와 치주 및 치태 검사를 통해 부작용 여부 (치아과민증 및 구감 내 연조직의 부작용)를 기록한 후 다음과 같은 결과를 얻었다. 1.실험군 및 대조군의 색 변화량 (ΔE)은 2이상으로 인지할 수 있는 색 변화를 보였으며, 두 제품 간에는 통계적으로 유의한 차이를 보이지 않아 (p > 0.05) 유사한 미백효능을 나타냄을 알 수 있었다. 2,미백효과는 명도의 개선보다는 주로 a. b값의 변화에 의한 것으로 특히 실험군에서 b값의 변화, 즉 황색조의 개선효과가 대조군에 비해 유의성 있게 높은 것으로 나타났다 (p <0.05). 3.치아나 치은의 과민증이나 이상증상을 호소하는 피험자는 없어 두 제품 모두 안전성을 확인할 수 있었다.
황유선(You-Sun Hwang),이정규(Jung-Kyu Lee) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.2Ⅲ
본 논문에서는 프레임 릴레이(Frame Relay: FR) 망과 ATM(Asynchronous Transfer Mode) 망이 연동할 때, 분석 대상인 연동장치(InterWorking Unit: IWU) 수신부에서 프레임이 처리되는데 걸리는 지연시간을 분석하였다. ATM과 FR 사이의 데이터 처리속도의 차이로 인하여 연동장치의 버퍼에서 프레임이 기다리게 된다. 이 때 지연시간을 IWU에서 ATM 망에서 들어오는 프레임의 평균값을 구한 다음에 Little's formula를 이용하여 수학적으로 분석하였다. 결과적으로 FR 연결된 수가 증가할수록 연동장치에서 프레임의 지연시간은 지수적으로 증가함을 알 수 있었다. 또한 지연시간을 분석하므로 해서 연동장치에서 timeout의 시간을 결정하여 프레임을 재전송 할 수 있는 시간을 결정할 수 있었다.
증례 : 호흡기 ; 임산부에서 발생한 원발성 폐암 1예
고선혜 ( Sun Hye Ko ),강현희 ( Hyeon Hui Kang ),임선미 ( Sun Mie Yim ),황유미 ( You Mi Hwang ),지은혜 ( Eun Hye Ji ),오유석 ( You Suk Oh ),이상학 ( Sang Haak Lee ) 대한내과학회 2012 대한내과학회지 Vol.82 No.1
A 36-year-old primivida, at 29 weeks of pregnancy with no smoking history, was admitted to the hospital complaining of cough for 3 days. Chest X-rays revealed atelectasis of the right upper lobe, and a transbronchial Lung biopsy confirmed primary Lung adenocarcinoma. After consulting with obstetricians and neonatologists, we wanted to deliver the child and treat the mother with chemoradiotherapy. But as she was adamantly opposed to treatment until fetal Lung maturation was complete, we planned to delay the birth until 34 weeks, deliver the baby by caesarian section, and then treat the mother. However, maternal hypoxia and fetal distress resulted in an emergency delivery at 30 weeks. After delivery, we treated the mother`s brain metastases with radiation therapy and systemic cisplatin-pemetrexed, but she deteriorated and expired 95 days after the diagnosis. Lung cancer during pregnancy is a rare disease and raises many medical and ethical issues in deciding the best course of therapy. We describe our clinical approach and review the potentially challenging features of managing a pregnant patient with Lung cancer. (Korean J Med 2012;82:85-89)
다중 안테나 통신 시스템을 위한 저복잡도 채널 전처리 프로세서
황유선 ( You Sun Hwang ),장수현 ( Soo Hyun Jang ),한철희 ( Chul Hee Han ),최성남 ( Sung Nam Choi ),정윤호 ( Yun Ho Jung ) 한국항행학회 2011 韓國航行學會論文誌 Vol.15 No.2
본 논문에서는 최대 4개의 송·수신 안테나를 지원 가능한 4x4 다중 안테나 (MIMO) 시스템에서 채널의 dimension을 축소함으로써 복잡도를 줄일 수 있는 저복잡도 채널 전처리 프로세서를 제안하고 구현한다. 제안된 채널 전처리 프로세서는 채널의 일부분을 간섭신호라 간주하고 제거하는 GIS 행렬을 구하는 데 있어서 행렬의 역행렬과 행렬간의 승산 연산을 줄이기 위해, QR 분해 기법을 이용하여 4x4 MIMO 채널 전처리 프로세서의 복잡도를 최소화한다. 또한, 로그 수체계를 이용하여 행렬간의 복소수 승산을 가산으로, QR 분해 기법의 사용으로 인해 생기는 나눗셈 연산을 감산 연산으로 대체함으로써 연산기의 단순화를 진행하고, 이를 통해 하드웨어 복잡도를 크게 감소시킨다. 제안된 채널 전처리 프로세서는 하드웨어 설계 언어 (HDL)을 이용하여 설계되었고, 0.13 um CMOS 규격 셀 라이브러리를 사용하여 합성되었다. 그 결과 기존의 2의 보수 수체계를 이용한 채널 전처리 프로세서의 설계 구조 대비 로그 수체계를 이용한 제안된 채널 전처리 프로세서의 하드웨어 복잡도가 20.2% 가량 감소됨을 확인하였다. In this paper, the channel preprocessor with an area-efficient architecture is proposed for the MIMO symbol detector which can support four transmit and receive antennas. The proposed channel preprocessor can shrink the channel dimension to reduce the hardware complexity of the MIMO symbol detector. Also, the proposed channel preprocessor is implemented with very low complexity by using QR decomposition (QRD) and log-number system (LNS). By applying QRD and LNS to the nulling matrix calculation block, the numbers of matrix-multiplications and matrix-divisions are decreased and thus the complexity of the proposed channel preprocessor is significantly reduced. The proposed channel preprocessor was designed in a hardware description language (HDL) and synthesized to gate-level circuits using 0.13 um CMOS standard cell library. With the proposed channel preprocessor, the number of logic gates for channel preprocessor is reduced by 20.2% compared with the conventional architecture.