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朴允錫,柳盛林 충주대학교 1997 한국교통대학교 논문집 Vol.12 No.2
In the frequency domain study of linear feed back control system, the Nyquist criterion, the Bode plot, and the Nichols chart were shown to be very useful tool of analysis. The above Mentioned technigues will lead to the design of a feedback control system penfermance are given in terms of the gain margin, prase margin, peak of resonance Mp band width , etco However, in the study of linear systems. it is equally important to consider the time domain specifications, such as the over shoot, damping ratio, setting time, etc Although theoretically, there is a definite correlation between the frequency response and the transient response, Unfortunately, simple relationships can be obtained only for system of the order of two of less. The root locus technique was introduced by Evans in 1948, and the art has been greatly developed in the past few year. The technique can be regarded as a grapbical method of determining the roots of the characteristec equation of asingle seek back loop system.
22.9㎸ NGR 상용주파 자계발생장치 구축 및 모의 해석
임윤석(Yun-Seog Lim),이상윤(Sang-Yun Lee),서인진(In-Jin Seo) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
The 22.9㎸ neutral ground reactor(NGR) which is connected the secondary neutral line of 154㎸ main transformer is used for protecting electric facilities and security of life. This paper presents installation of 22.9㎸ NGR magnetic field generator and comparable result between magnetic field measurement and simulation in order to reduce magnetic field around NGR effectively.
Park, Seog Yun,Chang, Hee Jin,Kim, Dae Yong,Jung, Kyung Hae,Kim, Sun Young,Park, Ji Won,Oh, Jae Hwan,Lim, Seok‐,Byung,Choi, Hyo Seong,Jeong, Seung‐,Yong Blackwell Publishing Ltd 2011 Histopathology Vol.59 No.4
<P>Park S Y, Chang H J, Kim D Y, Jung K H, Kim S Y, Park J W, Oh J H, Lim S‐B, Choi H S & Jeong S‐Y (2011) <I>Histopathology</I><B>59</B>, 650–659</P><P><B>Is step section necessary for determination of complete pathological response in rectal cancer patients treated with preoperative chemoradiotherapy?</B></P><P><B>Aims: </B> To assess the efficacy of the step section for determination of pathological complete response (pCR) in rectal cancer treated with preoperative chemoradiotherapy (CRT).</P><P><B>Methods and results: </B> Of 709 patients with rectal cancer who received preoperative CRT, 88 were initially diagnosed as having pCR. These 88 patients were re‐evaluated after two‐level step sections of the entire tumour by using Dworak’s regression grade. Additional serial step sections revealed residual tumour cells in seven of 88 patients (7.95%), all of whom were upgraded to regression grade 3 (near total regression) from regression grade 4 (total regression). Of these seven patients, one (14.3%) showed tumour recurrence, compared with 11 of 81 (13.6%) patients with a final regression grade of 4. Neither recurrence rate nor disease‐free survival rate differed significantly between these two groups (<I>P </I>><I> </I>0.5). Calcification was significantly more frequent in grade 3 than in grade four patients (71.4% versus 32.1%; <I>P </I>=<I> </I>0.037), and acellular mucin pools were associated with better disease‐free survival (<I>P </I>=<I> </I>0.022).</P><P><B>Conclusions: </B> Stratifying patient outcome by final regression grade after step section did not yield different outcomes in patients with initial pCR. If residual tumour cells are not identified on initial meticulous examination, further processing of step sections is not necessary.</P>
Chemotherapy Use and Associated Factors among Cancer Patients near the End of Life
Yun, Young Ho,Kwak, Miyoung,Park, Sang Min,Kim, Samyong,Choi, Jong Soo,Lim, Ho-Yeong,Lee, Chang Geol,Choi, Youn Seon,Hong, Young Seon,Kim, Si-Young,Heo, Dae Seog S. Karger AG 2008 Oncology Vol.72 No.3
<P><I>Objectives:</I> We investigated the frequency of chemotherapy use and its associated factors in patients in all age groups in the last year of life. <I>Methods:</I> We identified cancer patients who died in 2004 in any of 17 hospitals. We used demographic and treatment characteristics by computerized hospital information systems and by linking the identification numbers to the 2004 death registry. <I>Results:</I> 48.7% of patients in the last 6 months of life, 43.9% in the last 3 months, and 30.9% in the last month of life received chemotherapy. The frequency of chemotherapy use was lower for older patients. In those ≥65 years old, there was no difference between women and men in the proportion that received chemotherapy. For patients <65 years of age, a larger proportion of women than men received chemotherapy, and chemotherapy use was significantly less frequent for patients with refractory disease than for those with responsive disease. Patients dying at a relatively small hospital without a hospice inpatient unit were significantly more likely to receive chemotherapy. <I>Conclusions:</I> Despite the fact that most cancer patients are resistant to chemotherapy at the end of life, it was administered often to all age groups.</P><P>Copyright © 2007 S. Karger AG, Basel</P>
초음파 및 마이크로공기부양법을 이용한 양식장 퇴적물 제거 특성
김석구(Seog Ku Kim),안재환(Jae Hwan Ahn),윤상린(Sang Leen Yun),강성원(Sung Won Kang),이정우(Jung Woo Lee),이제근(Jea Keun Lee),임준혁(Jun Heok Lim),김동수(Dong Soo Kim),이태윤(Tae Yoon Lee) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.10
본 연구는 양식장 퇴적토의 효과적 제거를 위해 초음파와 마이크로 공기를 이용한 퇴적토 부상제거를 위한 연구이다. 통영지역 양식장 퇴적토는 중금속 오염은 없으나 많은 양의 유기물을 함유한 것으로 파악되었고 수질보전을 위해 이들 퇴적토의 효과적 제거가 필요한 실정이다. 실험실 규모의 실험에서 초음파를 사용하지 않은 경우는 마이크로 공기를 주입하더라도 제거율은 초음파를 사용한 경우보다 현격히 낮아 초음파 사용이 필요함을 알 수 있었다. 또한, 마이크로 공기 주입시 응집제의 사용은 퇴적토 입자의 크기를 증가시켜 마이크로 공기에 의한 부상을 용이하게 하여 제거율이 크게 향상되었다. 퇴적토 양에 따른 부상제거 실험에서는 퇴적토 양이 증가함에 따라 제거율이 95.8% (1 g/L)에서 83.9% (8 g/L)로 감소하였으나, 대부분의 미세입자는 마이크로 공기에 의해 부상처리되어 제거되었음을 알 수 있었다. The purpose of this study was to remove sediments obtained from breeding ground using supersonics and micro-air flotation method. Sediments from Tongyong breeding grounds showed no contaminations of heavy metals but had great amount of organics. Thus, efficient removal of sediments was required to preserve water quality near breeding ground. Supersonics treatment for sediments was determined to be essential because higher removal efficiency of sediments was obtained when supersonics treatment was used. In addition, application of coagulants increased removal efficiency because its usage increased particle size of sediments, which enabled easy trapping of sediments particle into micro-air bubbles. Removal efficiency of sediments slightly decreased from 95.8% (1 g/L) to 83.9% (8 g/L) at the tests for different amount of sediments, but most of tiny particles were removed from water where sand size particles were left in the bottom of reactors.
김석구(Seog Ku Kim),안재환(Jae Whan Ahn),강성원(Sung Won Kang),윤상린(Sang Leen Yun),이정우(Jung Woo Lee),이제근(Jea Keun Lee),임준혁(Jun Heok Lim),김동수(Dong Soo Kim),이태윤(Tae Yoon Lee) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.11
본 연구는 광안대교 하부의 퇴적토 오염조사를 위해 퇴적토의 기본물성 및 중금속 함량을 측정하였다. 퇴적물 시료의 산화물을 분석한 결과, SiO₂와 CaO의 경우 강하구에서 멀어 질수록 SiO₂는 증가하고 CaO는 감소하는 경향을 보였다. 강열감량의 경우, 7.2~14.3%의 분포를 보여 비교적 높은 값을 나타내었고 TOC는 0.9~5.5%로 지역에 따라 편차가 큰 것을 알수 있었다. 이는 USEPA 퇴적물환경기준(비오염, 중간오염, 심한오염)에 따라 심한오염으로 평가되었고, TOC의 경우, 강하구에서 가장 먼 시료채취 지점(GW7)은 영향없음으로 평가되었고 나머지 지역은 최소영향수준으로 평가되었다. 중금속의 경우에는 USEPA와 캐나다 기준으로 평가하였을 때 모두 비오염으로 평가되어 중금속에 대한 오염도는 없는 것으로 평가되었다. 다만, 강열감량의 값이 크기 때문에 USEPA 기준으로 평가할 때 중금속의 오염은 없지만 전체적으로는 심한 오염으로 평가되었다. In this study, physical properties and heavy metal contents of sediments obtained from the bottom of Gwangan bridge were measured to determine pollution level of the sediments. From the results of the oxide contents of the sediments, SiO₂ was decreased as the sampling points became more distant from the stream of river. On the contrary, CaO showed opposition aspect to SiO₂. Ignition loss of sediments ranged from 7.2 and 14.3% and 0.9 and 5.5% for TOC. For EPA guidelines of ignition loss, all sampling points were classified as heavily polluted areas. When TOC was considered, all areas were classified as lowest effect level except for GW7 where classified as no effect level. All areas were free of heavy metal contamination evaluated by USEPA and Canadian guidelines. However, all areas were classified as heavily contaminated areas due to the high value of ignition loss when USEPA was used.