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합성하수를 이용한 금속 막의 정밀여과 특성 및 막 오염 제어
정종태,김종오,김학균,김석구,이용재 7개 국립대학교 환경연구 논문집 공동발행 위원회 2004 공업기술연구 Vol.4 No.-
This study was to evaluate the filtration performance of metal membrane with synthetic wastewater and to investigate the effective control of membrane fouling using ozone backwashing. The increase of substrate concentration caused the increase of cake layer resistance and total resistance, however, plugging resistance decreased. Total resistance of metal membrane was mainly attributed to the permeate resistance of cake layer, which was formed by deposited particles from the physico-chemical interactions of solids on membrane surface. Intermittent ozone backwashing was more effective then the air backwashing for fouling reduction. The permeation flux recovery of air backwashing decreased over 50%, however, ozone backwashing decreased less than 10% for 4 hours filtration. This may be ascribed to the degradation of foulants in pore structure by the strong oxidation of ozone and physical exfoliation of cake layer on membrane surface with backwashing.
정보통신분야 국가기술자격증 취득과 정보통신공학 전공 학생들의 취업률 증진을 위한 방안
정기석,민경일,조용석,신용달 永同大學校 1997 硏究論叢 Vol.3 No.1
본 연구에서는 정보통신분야 국가기술 자격증 취득과 정보통신전공학생들의 취업률증진을 위한 방안을 제시하고 그 결과를 고찰하였다. 국가기술자격증 취득방안으로는 동기부여, 특강별로 한 과목씩 단계적인 강의 등의 방법을 제시하였고, 취업률 증진 방안으로는 학생수준에 맞는 업체선정지고, 취업자료 수집, 업체방문 등의 방법을 제시하였다. 연구결과는 업체의 요구조건은 공통적으로 어학증명서와 기술자격증으로서 대기업에 취업하기 위해서는 어학실력이 좋아야 하며 따라서 TOEIC등의 시험을 적극 권장할 필요가 있음을 보여준다. This paper examines a plan for acquiring a technical qualification and promoting the percentage of employment in Information & Communication Engineering Major. As a plan for acquiring a technical qualification, study methods of a motive allowance, step lesson of a curriculum etc. are presented. Also, as a plan for promoting the percentage of employment, study methods of a collection of employment data, company visit etc. are presented. Results of study show that companys require a technical qualification and a certificate of foreign language, so TOEIC should be recommended.
가토의 하악골 연장시 Sodium fluoride 투여가 골형성에 미치는 영향
김용하,설정현,변우목,김정철,우상현,강무석 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.4
The purpose of this study was to improve bone formation and shorten the period involved in distraction osteogenesis using sodium fluoride (NaF). This has been used in managing osteoporosis for several decades. This study was carried out on 40 New Zealand white rabbits. Twenty animals were used for a control group (no medication) and 20 for the experimental group. NaF 1 mg/kg/day was administered to each experimental animal via drinking water beginning 4 weeks prior to surgery and continued until sacrifice for examination. A distraction device was applied to the left mandible along a plane perpendicular to the direction of osteotomy. After a 5-day latent period, the mandibles were lengthened at 1 mm per 24 hours for 10 days. Five rabbits from each group were sacrificed on the 1st day, 2nd week, 4th week and 8th week of the consolidation period. After lengthening, all the rabbits developed a severe cross-bite. By the 4th week, cortical continuity was seen. Bone densities at the site of bony lengthening were measured by quantitative computer tomography (QCT) and dual X-ray absorptiometry (DXA). The results were as follows: the measurements of the experimental group were significantly higher than of the control group by the 1st day of the consolidation period (p<0.05) and insignificantly higher after the 2nd week. Histologically, in the experimental group, there were more osteoblasts, increased and thickened trabeculae and more mature lamellar bones than in the control group. This study showed that osteogenesis of the experimental group was significantly higher during and immediately after distraction. Our study suggested that the use of NaF could improve bone formation and decrease the period of distraction osteogenesis if a safe dose and method of fluoride administration can be determined for growing humans.
멀티미디어를 기반으로 하는 정보통신 분야 자격시험 학습 자료 개발
민경일,정기석,조용석,황재효 永同工科大學校 1996 硏究論叢 Vol.2 No.1
저작 도구를 사용하여 정보통신분야 1, 2급 멀티미디어 CD 타이틀을 제작하였다. 유제 문제는 STC 교과목 학습을 통하여 엄선하여 데이터 베이스화 하였다. 또한, 정보통신공학을 전공한 학생들이 CD 타이틀 제작에 참여하므로 멀티미디어 시스템 실무 능력을 배양하는 계기가 되었고, 전공에 대한 실질적인 학습 효과가 있었다. 학생들이 제작된 CD 타이틀을 이용하면 자기 학습과 반복 학습이 가능하므로 학습 능률이 극대화되어 기사 자격 시험을 준비하는 학습을 효과적으로 할 수 있을 것이다. A multimedia CD title has constructed for qualifying test of information and communication engineering. Similar problems have been selected during STC lectures and have been databased. Furthermore, the students majored in information and communication engineering participated in the process of constructing the CD title, and as the results, they could obtain practical abilities on the multimedia systems. Using the CD title, they can be able to study for the qualifying test efficiently.
T-50 운용자료 분석을 통한 주요 구성품 수명연장 방안
남용석(Yong-Seog Nam),노신백(Shin-Baek Rho),김태환(Tae-hwan Kim),송재용(Jae-yong Song),정영명(Yeon-Myeong Jeong) 제어로봇시스템학회 2011 제어로봇시스템학회 합동학술대회 논문집 Vol.1 No.1
T-50 항공기는 운용신뢰성 향상을 위해 총수명주기관리체계(TLCSM, Total Lifecycle System Management)관점에서 운용 데이터에 대한 분석을 수행하고 있으며, 이러한 자료의 획득은 기 구축된 통합군수지원체계를 이용하고 있다. 본 논문에서는 T-50 항공기 운용중 다빈도 정비품목에 대해 통합군수정보체계에서 운용하는 항공기 정비자료를 분석하여 고장간 평균비행기간(MFTBF, Mean Flight Time Between Failure) 분석을 수행하였고, 그 분석결과를 토대로 수명연장 설계개선 방안을 도출하였다.
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>