공급률 및 탈곡통 길이 변화에 따른 자탈형 콤바인 탈곡 성능

서신원,이상우,허윤근 충남대학교 농업과학연구소 2006 농업과학연구 Vol.33 No.2

Threshing loss was increased due to dropping of the threshing efficiency when the 4 row head-feed combine harvested 5 row rice to improve harvesting performance of a combine. Reasonable design criteria were examined to determine the ranges of both of feed rate and the length of threshing drum for the 4 row head-feed combine being used as a 5-row combine. Harvesting performance increased as working width or working speed increased, it resulted in 15% increase when the working width increased from4 row to 5 row. Harvesting operations of the 4 row combine performed normally in the 4 row rice in threshing loss less than 1%, however, threshing loss increased to 2.25% in the 5 row due to poor threshing efficiency. The length of threshing drum was increased from 710 mm to 810 mm as well as the speed of crop feed chain was increased from 0.61 m/s to 0.75 m/s so as to improve the poor threshing efficiency resulted from the enlarged working width from the 4 row to the 5 row, which would decrease threshing loss less than 1%.

석유화학공단 지역의 대기중 황화합물에 관한 연구

서성규,김상채 國立 麗水大學校 環境問題硏究所 1998 環境硏究論文集 Vol.1 No.-

The odor of sulfur compounds which are of air pollutants in petroleum industrial complex was investigated. Concentration vs. peak areas resulted from analyzing four sulfur compounds within the ranges of very low concentration by GC method were correlated. Correlation coefficients of four sulfur compounds were found to be above 0.9941 and very good. No sulfur compounds exception hydrogen sulfide(H₂S) were detected at four measuring sites. Also, concentration of hydrogen sulfide was much lower than an emission standard(0.2ppm) within the industrial area. Concentration of hydrogen sulfide was insignificantly changed with times and sites of sampling. However, average concentration of hydrogen sulfide of #2 site was higher than other sites.

한약개발에 관한 연구(第Ⅱ報) : 왕자귀나무 Albizzia coreana Nakai의 활성성분 및 행동약리학적 연구(2) Studies on the behavioral pharmacology and the activated constituents of Albizzia coreana Nakai(2)

徐成勳,陸昌洙,姜三植 慶熙大學校 1987 論文集 Vol.16 No.-

Albizzia coreana belonging to Leguminosae was firstly collected from southern area of Korea in 1930 by Dr. Nakal. A deciduous tree(higher:3∼5m). Leaves bipinnate, leablet(20∼45㎜), entire, 6-10 pairs. Flowers in axillary long-peduncled heads, pale yellowish. pods thin(width:2㎝. length 7∼12㎝), Seeds(Width:4-5㎜, length 7㎜) The stem bark(Albizia coreana) are used medicinally(folk medicine). Prescreibed as sedative in insonmia, in a state of deep depression and nervosity. Dose 6∼12gm.(powdered) The chemical components of the methanol extracts of Leaves, stem bark and root barks of Albizzia coreana Nakai. From the stem bark of Albizzia coreana, sapogenin, 3β, 21 β-dihydroxyolean-12-en-28-vic acid methylester, 3β-hydroxyolean-12-en-28-oic acid and acacic acid lactone were isolated and characterized by chemical and spectral analysis. β-sitosterol, cholesterol and octadecanoic acid were isolated from the stem bark and leaves. Flavone and flavonol glycosides, quercetin-3-L-rhammoside, quercetin-3-0-glucoside and quercetin-3-0-galactoside were isolated from the Albizzia leaves and identified by spectral data.

한국어 문장-음성 변환 시스템을 위한 하드웨어 및 제어프로그램의 개발에 관한 연구

徐相勳 건국대학교 1994 論文集 Vol.9 No.-

This thesis presents the TTS(Text To Speech converter) which can convert the Korean test to speech. The software and hardware, which are main component of TTS, are tentatively designed and made. The two byte combination Korean character code is used for TTS to communicate with host system. And its code should be divided into 3 byte character code, an initial sound, middle sound and final sound for searching the phoenem DB(Data Base). The divided 3 byte character code is used to create a unique syllable in accord with the stored phoenem DB in EP-ROM. The stored phoenem DB is consisted of 19 initial consonants, 7 final sounds and 10 vowels, and used by control program to make the process of vocal sound. The ADSP -2101KG50 manufactured by Analog devices, Inc. is used as a main CPU of TTS. The ADSP-2101KG50 is DSP chip for processing of high speed arithmetic and digital signal and can execute all of instruction using the one clock cycle. The method of communication between the host and TTS is RS-232C, and for this communication the UM6551 ACIA from UMC company is used. TTS can transfer voice message on real time via the law-speed communication path (less 100 bps). But it needs to increase voice quaility to take advantage of the improvement in phoenem DB, for processing of vocal sound and function of rhythm.

원형실린더 後流의 亂流流動特性에 관한 實驗的 硏究

서승호,박종호,서명식 忠南大學校 産業技術硏究所 1992 산업기술연구논문집 Vol.7 No.1

Two-dimensional turbulent wake flows behind a circular cylinder are investigated experimentally by using the linearized constant temperature hot wire anemometer. The Smoke-wire technique also has been used to study the vortex formation and shedding process behind the circular cylinder. Experiments on the vortex shedding frequencies, global mean velocities and fluctuating velocity distributions and autocorrelation were conducted in open type subsonic wind tunnel. Mean and fluctuating velocities are measured from X=0 to X=7D in the range of Reynolds number between 10³and 9 ×10⁴. The results show that Strouhal number was about 0.192 and minimum pressure point on the cylinder surface is located 70˚from the stagnation point.

Chlorhexidine과 fluoride 성분의 varnish가 타액 내 mutans streptococci 수에 미치는 효과

서정아,김재곤,백병주,양연미,이용희,김상훈 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.4

본 연구의 목적은 chlorhexidine(Cervitec)과 fluoride(Fluor-protector) 성분을 각각 포함한 varnish를 치아에 적용하였을 때 타액내의 mutans streptococci의 수의 감소에 미치는 효과를 알아보기 위한 것이다. 전북대학교 치과대학생 40명을 대상으로 하여 mutans streptococci 균종 수를 평가하였으며, 이들을 무작위로 네 군으로 나누어 다음과 같이 varnish를 적용하였다; A) varnish를 적용하지 않은 군(n=10), B) chlorhexidine varnish 적용군(n=10), C) fluoride varnish 적용군(n=10), D) chlorhexidine과 fluoride varnish를 모두 적용한 군(n=10), Mutans streptococci 수 측정에는 Orion diagnostica 사의 Dentocult SM을 사용하였다. Varnish를 적용하지 않은 상태에서 1차로 Mutans streptococci 수를 측정한 후 각각의 varnish를 적용하였으며, varnish 적용 12주 후 다시 측정하여 기록하였다. 모든 실험군(group B, C, D)에서 12주 후에 측정한 Mutans streptococci 수가 감소한 개체가 증가한 개체보다 많았으나 통계적으로 유의한 차이는 보이지 않았다(p>0.05). 실험에 사용된 어떠한 varnish도 적용 12주 후에 타액 내 mutans streptococci 수에 통계적으로 유의할 만한 변화를 주지는 못하는 것으로 나타났다(p>0.05). The objective of the present prospective trial was to compare the efficacy of chlorhexidine(Cervitec), Fluoride(Fluorprotector) and combination of chlorhexdine and fluoride varnishes in decreasing the level of salivary mutans streptococci. Forty healthy students of school of dentistry, Chonbuk national university were investigated to evaluate mutans streptococci(MS) counts and randomized into four groups to treat with the experimental varnishes: A) untreated group(n=10), B) chlorhexidine group(n=10), C) fluoride group(n=10), D) chlorhexidine and fluoride group(n=10). Dentocult SM^(�)(Orion Diagnostica) strip method was used for measurement of the level of mutans streptococci in saliva. Stimulated saliva were collected at baseline for mutans streptococci counts evaluation(ms1), 12 weeks later the completion of each varnish treatment, mutans streptococci counts were re-evaluated. In varnish group with chlorhexidine, fluoride and combination of chlorhexidine and fluoride, the level of mutans streptococci was lower after 12 weeks than at baseline, but there were no significant differences in saliva(p>0.05), when compared with baseline. After 12 weeks, a remarkable reduction was still found in the subjects with high level of mutans streptococci at baseline, but not different in the low and moderate level of mutans streptococci(p>0.05).

학습 독자를 위한 문학 비평 교육의 방향

서민정,유성호 한국교원대학교교육연구원 2006 敎員敎育 Vol.22 No.4

구강악안면 외상 환자의 창상 감염에 대한 임상세균학적 연구

서일영,유선열 전남대학교 치의학연구소 2003 구강과학 Vol.15 No.1

With increasing incidence of motor vehicle accidents and violent instrument-aided assaults, there has been a concomitant increase in oral and maxillofacial injuries. One of the greatest problems in achieving successful treatment for the injuries is wound infection. This study is to use selected antibiotics appropriately from bacteriological culture and antibiotic sensitive test for curing of wound and to prevent the infection by microorganism and also to prevent misusing and abusing antibiotics. A clinicobacteriological study was done in 40 patients with maxillofacial injuries treated in the Department of Oral and Maxillofacial Surgery of Chonnam University Hospital during the period of March 2002 though August 2002. Causative bacteria of wound contamination and infection were identified by bacteriological culture. Antibiotic sensitivity test was also done for the isolated bacteria. Clinical data were analyzed for the following issues: sex and age distribution, causes, types, site of injuries, and time elapsed from injury to treatment. Bacterial culture was positive in 29 out of 40 cases: 16 out of 20 fracture and laceration wounds, and 13 out of 20 simple laceration wounds. Frequently isolated bacteria were Streptococci viridans (24%), gram-positive bacilli (24%), Streptococcus salivalius (13%). and Staphylococcus species(13%). Streptococcus species were the most popular bacteria in the oral cavity (44.8%) and Staphylococcus species on the facial skin (27.3%). In comparison. Streptococcus species were the most popular bacteria in the oral cavity (41%)and Staphylococcus species the facial skin (53.6%) in normal healthy subjects. The positivity of bacterial culture was not related with causes of injury, ages, or sexes, but closely related with types and locations of the injuries and time intervals from injury to treatment. The injuries in the oral cavity (75.8%) were more positive in the bacterial culture than facial skin injury (63.6%) and complex lacerations (80%) were more positive in the bacterial culture than simple lacerations (65%). The patients who had a treatment from injury over 3 hours showed more positivity in the bacterial culture than those under 3 hours. The isolated bacteria were more sensitive to clindamycin, erythromycin, cefotaxim than to oxacillin, ampicillin and penicillin. In conclusion, effective antibiotics should be given judiciously in patients who have severe oral and maxillofacial trauma, who do not have proper treatment for hours, and who have simple injuries in oral cavity as well. Clindamycin, erythromycin, cefotaxim are effective as primary antibiotics in these cases.

韓國産 紅花子와 中國産 紅花子가 鎭痛 , 消炎 및 關節炎에 미치는 效果

서부일,이은숙,박지하,김상찬,변부형,최호영 대한본초학회 2001 大韓本草學會誌 Vol.16 No.1

This experimental study was done to compare the efficacy of Korean and Chinese Carthami Semen on analgesic effect and remedy of inflammation and arthritis. The results were as follows; 1. In analgesic action on the writhing syndrome in mice induced by 0.7% acetic acid, Korean and Chinese Carthami Semen extract group showed significant decrease in comparison with control group. And in analgesic action on the writhing syndrome in mice induced by Acetylcholine HC1, Korean and chinese Carthami Semen extract group showed significant decrease in comparison with control group. 2. In Anti-inflammatory effects, Chinese Carthami Semen extract group showed significant decrease at 150 and 180 minutes after inducing paw-edema in comparison with control group. 3. In the method of adjuvant arthritis, orally administered for 21 days, Korean Carthami Semen extract group showed significant inhibition of the hind paw edema after 1 day and 21 days. Whereas Chinese Carthami Semen extract group showed some reduction, but the results didn's show significant decrease. 4. In the level of leucocytes count, Korean and Chinese Carthami Semen extract group showed significant decrease in comparison with control group. And in the level of total protein. CRP and glucose, Korean and Chinese Carthami Semen extract group didn't showed significant change in comparison with control group.

릿벨트법에 의한 La_1+xSr_2-xMn₂O_7상의 구조 정밀화

서상일,최창규,송민석,이재열 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.2

The RP phases, La1+XSr2-XMn2O7-δ, were synthesized with La2O3, SrCO3 and MnO2 by solid state reaction at 1450℃. Stable single phases were crystallized in the range of x=0.2 ∼ x=0.5. In this paper, the structures of the La1+XSr2-XMn2O7 were refined with the X-ray powder diffraction data using the Rietveld method. This structure belongs to the space group of I4/mmm and the structure is built up from the intergrowth of one rock salt type layer with a double perovskite layer. As x increases, the Mn-O bond distance along c-axis grows longer than the bond of in ab plane due to increased Jahn-Teller distortion, which is arised from the increased concentration of Mn3+ ions.