ATM망에서 실시간 연결수락제어에 관한 연구

장혁,김영훈,김용수,김희철,나상동 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1

본 논문은 이질적 버스트 트래픽을 갖는 ATM(Asynchronous Transfer Mode) 망에서 실시간 연결 수락 제어를 위한 유체 흐름 모델(fluid flow model)에 기반을 둔 실시간 알고리즘을 제안한다. 셀 손실 확률은 QOS(Quality of Service)의 기준이 되므로 제안된 실시간 알고리즘은 일정한 메모리 크기와 연결 요청의 수락 여부 즉, 연결 수락 여부의 결정을 위한 하나의 영역을 필요로 한다. 이러한 트래픽 소스 각 타입에 대한 셀 손실 확률은 트래픽 소스 타입 전체에 하나만 존재하더라도 요구를 충족 시킬 수 없으므로, 본 논문에서 제안된 실시간 알고리즘에 의해 산출되는 각각의 셀 손실확률에 충분한 상한선을 제공하는 전형적 트래픽 매개변수를 사용하여 성능을 분석한다.

미다졸람의 비강 내 추가투여가 소아의 경구 진정요법에 미치는 영향

장수영,김지연,박기태 大韓小兒齒科學會 2012 大韓小兒齒科學會誌 Vol.39 No.1

Effect of supplementary intranasal midazolam on oral sedation of children The purpose of this study was to compare the cardiopulmonary parameters of two sedation regimens during dental treatment: (1) Oral chloral hydrate(CH) and hydroxyzine(HZ) with nitrous oxide-oxygen(N2O/O2) inhalation( CH-HZ group); (2) Oral chloral hydrate(CH) and hydroxyzine(HZ) with nitrous oxide-oxygen(N2O/O2) inhalation and supplementary intranasal(IN) midazolam administration(MIDA group). Among the patients of OO hospital who received dental treatment under sedation over the past 5 years, 44 patients were selected for each group of CH-HZ and MIDA according to their age, gender and weight. Following parameters that were recorded every 5 minutes were compared: 1) Heart rate(HR) 2) O2 saturation 3) End tidal carbon dioxide concentration(EtCO2) 4) Respiratory rate(RR) 33 patients of Group MIDA who have complete data of 15 minutes before and after supplementary IN midazolam administration were selected. And measurements 15 minutes before and after midazolam administration in same patient were evaluated. The results were as follows: 1. Heart rate was significantly higher in MIDA group than in CH-HZ group, but it was within normal range. 2. Comparing HR, O2 saturation, EtCO2, RR between before and after of supplementary IN midazolam administration in the same patient, the differences were not statistically significant. 이 연구는 소아환자의 경구 진정요법 시 미다졸람의 비강 내 추가 투여가 심폐기능에 미치는 영향을 알아보기 위한 것으로 5 년간 삼성서울병원 소아치과에서 chloral hydrate와 hydroxyzine을 경구투여하고 N2O/O2 inhalation을 추가로 사용한 진정요법으로 치료 받은 환자 중 미다졸람을 추가투여 받은 실험군(MIDA군)과, 미다졸람을 추가 투여하지 않은 대조군 (CH-HZ군)을 각각 44명씩 선정하여 서로 비교하였다. 진정요법 중 5분마다 측정된 1) Heart rate(HR) 2) O2 saturation 3) End tidal carbon dioxide concentration (EtCO2), 4) Respiratory rate(RR)의 평균값을 비교하였다. 또한 동일 환자에서의 미다졸람 투여 전 후의 심폐기능지표의 변화 양상을 평가하기 위해 MIDA군 중에서 미다졸람 투여 전 후 15분 이상의 기록이 존재하는 33명을 선정하여 미다졸람 투여 전 후 15분 시점의 측정값을 각각 비교하였다. 결과는 다음과 같다. 1. Heart rate는 미다졸람을 추가 투여한 군에서 유의하게 높았으며 나머지 심폐기능 지표의 측정값들은 차이가 없었다. 두 군의 측정값들은 모두 정상범위 안에 있었다. 2. 동일 환자에서 미다졸람 투여 전 후 15분의 측정값을 비교한 결과 두 시점간에 측정된 값들은 유의한 차이가 없었다.

제주도 주변해역의 해수면 온도의 변동성

장승민,김동진,최영찬 제주대학교 해양과환경연구소 2005 해양과환경연구소 연구논문집 Vol.29 No.2

하지에 발생한 피부 결손의 치료에서 전 외측 대퇴부 유리 피판술의 유용성

권영호,장수진 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.2

Background : The objective of this study was to evaluate the clinical results of operative treatment on skin defect of lower extremities by free anterolateral thigh flap. Methods : Between 2005 to 2009 we followed up 10 cases who undergoing anterolateral thigh free flap because of lower extremity skin and soft tissue defect. 3 cases are heel, ankle and foot dorsum are each 2 cases, sole and knee, thigh are each 1 case. We observed that of implanted area's color, peripheral circulation at 3, 5, 7 days after operation and evaluation with operating time, amount of hemorrhage, implanted skin necrosis, additional operation, complications. Results : 9 cases of 10 showed successful localization and 1 case showed fail. Size of soft tissue defect due to trauma was 9.5 × 7.3cm (5 × 6cm∼13 × 8cm), due to trauma or infection was 18.3 × 11.8cm (13 × 6cm∼30 × 20cm). Skin color change was mainly due to congestion with hematoma, flap was not observed global congestion or necrosis except 2 cases which showed partial necrosis on margin that treated with conservative therapy. Conclusion : Anterolateral thigh free flap is useful in radical skin defect treatment and had a good results after operation functional reconstruction.

대학생의 전공에 따른 유행 동조성, 혁신성, 의복가치 차이에 관한 연구

장정임;윤지원;김수영;이규혜 한양대학교 2005 韓國 生活 科學 硏究 Vol.25 No.1

A change in economic and social environment has brought lots of changes in lifestyles and values of onsumers. This paper presents fashion conformity, innovativeness and clothing values of college students according to their academic majors. Respondents were 181 undergraduate students with diverse majors. The survey was conducted using a questionnaire designed to measure fashion conformity, innvativeness and utilitarian/hedonic clothing values. Seventeen items measuring fashion conformity and innovativeness and thirty six items measuring clothing values were adopted from existing studies. Chi-square, ANOVA, and multiple comparisons of means were conducted. Students were clustered into three groups of majors: Engineering/NaturalScience/Information majors (ENI), Business/Social/Humanity (BSH) majors and HumanEcology/Art/PhysicalEducation (HAP) majors. HAP majors were more innovative than ENI majors. Significant differences were found in hedonic and utilitarian aspects of clothing values. HAP majors had higher level of novelty/fun/attraction, fashion consciousness and social appraisal sensitivity dimensions. ENI majors showed higher level of comfort seeking among clothing values. No significance was found in clothing confidence, mix and match, economy, utility and handling dimensions of clothing values across different groups of majors. Results of this study imply that the consumer group according to a major has relation to fashion conformity, innovativeness and clothing values.

크리프 기공의 초음파 비파괴평가에 관한 연구

장영수,정현조 韓國非破壞檢査學會 1999 한국비파괴검사학회지 Vol.19 No.2

크리프 손상을 단계적으로 받은 순수 구리 시편에 대하여 손상 진전에 따른 기공의 미시구조 변화를 관찰하고 초음파 속도와 주파수 의존 진폭 스펙트럼 및 감쇠를 측정하였다. 손상 진전에 따른 입계기공의 비등방적 성장으로 인하여 하중축에 대하여 세 방향으로 측정한 속도는 이방성 거동을 보였다. 최대 2%의 기공에 대하여 종파와 횡파는 각각 11%와 4%의 속도 감소를 보였으며, 기공량의 증가와 함께 비선형적인 감소 경향을 보였다. 진폭 스펙트럼은 기공량이 증가함에 따라 고주파수 성분이 감소하고 중심 주파수가 저주파수로 이동하였으며, 감쇠는 사용 주파수 범위에서 거의 선형적인 거동을 보였다. 기공량의 정량적 비파괴평가 파라미터로서 정규화 속도, 진폭 스펙트럼의 중심 주파수, 감쇠 기울기를 선정하였으며 기공량과의 상관관계를 제시하였다. In order to ultrasonically evaluate creep cavities pure copper samples were subjected to creep test and their microstructures were examined. Ultrasonic velocities, frequency-dependent magnitude spectra and attenuations were measured on a series of copper samples obtained from the different stages of creep test. Velocities measured in three directions with respect to the loading axis decreased and their anisotropy increased as a function of the creep-induced porosity. The anisotropic behavior could be attributed to the progressive change of pore shape and preferred orientation as the creep advanced. The 2% porosity by volume decreased the longitudinal and shear wave velocities by 11% and 4%, respectively. Furthermore, both velocities decreased nonlinearly with the porosity. As the creep damage developed, the magnitude spectral lost high frequency components and their central frequencies shifted to lower values. The attenuation showed almost linear behavior in the frequency range used. Normalized velocity, central frequency shift and attenuation slope were selected as nondestructive evaluation parameters. These results were presented and showed good relations with the porosity content.

하수슬러지의 전처리가 슬러지의 생분해성에 미치는 영향

장은수,최영균,김형수,염익태 대한상하수도학회 2003 상하수도학회지 Vol.17 No.5

Effects of alkaline, ozone, and combination of alkaline and ozone pretreatments on the biodegradability of sewage sludge were investigated. Solubilization efficiency in terms of SCOD production was higher in the order of the sludge treated with both alkali and ozone, alkali, ozone. Alkaline pretreatment was performed at pH 12 for 3hr and ozone dosage was 0.02 or 0.05 gO₃/gSS. When the sludge was treated with ozone without alkali addition, the solubilization efficiency increased with the ozone dosage. Batch tests were conducted using activated sludge as a seed and pretreated sludge as a feed. The highest biodegradability could be obtained when the sludge was treated with both alkali and ozone. Biodegradability of the pretreated sludge showed linear relationship with the solubilization efficiency, suggesting that the solubilization efficiency be a useful index to evaluate the biodegradability of the pretreated sludge. Production of carbon dioxide during the batch tests also indicated that the alkaline followed by ozone pretreatment showed the highest efficiency for the biodegradability of the sludge.

애널리스트의 이익 예측 결정 요인

장유철,전수영 가톨릭대학교 산업경영연구소 2005 産業經營硏究 Vol.13 No.-

品種改良 油菜油의 水素添加에 따른 理化學的 變化에 관한 硏究

張文連,高英秀 漢陽大學校 韓國生活科學硏究所 1990 韓國 生活 科學 硏究 Vol.- No.9

This experiment was performed to study physical and chemical changes of rapeseed oil. The condition used for hydrogenation was 0.02% nickel catalyst under H2 pressure 3.5 kg/cm2 and temperature 180℃. Four rapeseed oils were Yeongsan, Naehan, Halla and Asahi. Physicochemical changes of the hydrogenated rapeseed oil were examined by measuring iodine value, refractive index, melting point, fatty acid composition and trans -isomers. The results of experiment are as belows : 1.As compared with the changes of fatty acid between the rapeseed oil with low erucic acid and native rapeseed oil, it was shown the changes in erucic acid contents of erucic acid were 2% in rapeseed oil with low erucic acid and 40% in native rapeseed oil. Contents of oleic acid were 60% in rapeseed oil with low erucic acid and about 20% in native rapeseed oil. 2.IV and RI of the above oils were gradually decreased in going on hydrogenation, however, there were little differences between rapeseed oil with low erucic acid and native rapeseed oil. 3.Rapeseed oil with low erucic acid was approached to the desirable MP within two hours, but native rapeseed oil was not. 4.Trans-isomers of rapeseed oil with low erucic acid were shown 25% or so that of native rapeseed oil, 40% above. The results of experiment suggest that it is desirable to make a study of decreasing trans acid of hydrogenated rapeseed oil.

안면골 골절에 관한 임상적 연구

심지영,오수진,장창덕,김영수 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.1

This study was based on a series of 213 patients with facial bone fractures treated at college of Medicine, Dong-A university from Mar. 1990 to Jun. 1993. The results obtained were as follows : 1. The ratio of male to female was 8.3 : 1 and 3rd decade(34.3%) was the highest age group in incidence. 2. Monthly incidence was the highest in Jan. & Jun.(10.3%) 3. Onset time and daily incidence was the highest in pm. 9:00-12:00(21.4%), Sunday(18.8%). 4. Traffic acidents(38.5%) were the most frequent etiologic factor. 5. The most common site of fracture was zygoma & zygomatic arch(42.3%) and mandible (37.8%), maxilla (10.9%) and nasal bone(9.0%) were next in order of frequency. 6. In mandible fractures, the most frequent site was symphyseal area(43.0%) and IMF & open redction was major method of treatment. 7. In zygoma & zygomatic arch fractures, zygoma(62.0%) was the most common fracture site and open reduction was the most frequent treatment method. 8. In maxilla fractures, the major fracture type was Le Fort I type (72.4%) and treatment was done by IMF & open reduction primarily. 9. postoperative complications were mal-union, fibrous-union, infection, osteomyelitis etc.