수질총량관리를 위한 오염삭감량 할당시 제한요소의 고려에 관한 연구

신현곤,천승규 대한상하수도학회 2002 상하수도학회지 Vol.16 No.5

In the application of Linear Programming technique for optimizing the load reduction allocation planning in total load management system, several factors must be considered for more reliable study. On the basis of this concept, the real reduction ratio of pollutants in each watershed and degradation factor for introducing the characteristics of each stream segment as the water quality goal and the variation of water quality were considered in this study. At optimizing process in Geum river system, as the upper limit ratio of reduction became smaller the total reduction load of Geum river basin increased but the possibility of contentment of water quality goal at each stream segment became lower. When the safety factor of water quality goal as 1.2 for Ⅳ grade, 1.15 for Ⅲ grade, 1.1 for Ⅱ grade and 1 for Ⅰ grade was applied, the total reduction ratio of load from Geum river basin was 41.6%. Water quality variation was considered by four statistical ways for ten years, such as the ratio of worst water quality, average worst water quality, average worst water quality of Q_275 and the average deviation of water quality worse than that of Q_275 to water quality of Q_275 of 1997. In these four methodologies reduction ratio of total load of Geum river to content water quality goal of each stream segment were from 28.4% to 32.6%.

無定形 실리카(왕겨재 및 실리카 흄)를 添加한 슬래그 시멘트의 蒸氣 養生에 의한 機械的 性質

申鉉澤,鄭喜天 慶尙大學校 1991 論文集 Vol.30 No.2

슬래그 시멘트에 무정형 실리카로서 왕겨재 및 실리카홈을 혼화재로 첨가한 조합물을 양생온도 90℃, 120℃, 양생시간 6,9,12hrs.로 변화시켜 증기양생한 경화체의 압축강도 및 미세조직을 관찰한 실험 결과는 다음과 같다. 1. 슬래그 시멘트에 왕겨재 또는 실리카 홈 0,3,5,7we.% 양생 조건 120℃-6,9,12hrs. 일때 9시간 증기양생시 가장 높은 압축강도를 나타낸다. 2. 동일한 상기 조건에서 혼합재료로서 왕겨재가 실리카 홈보다 높은 압축강도를 나타낸다. 3. 왕겨재 5%첨가시 120℃-9hrs 양생조건 일때 최고 압축강도는 793kg/㎠을 나타내었다. 4. SEM 미세조직 관찰에서 최고 압축강도가 높은 왕겨재의 경우는 미세기공이 적고 조직이 치밀함을 보여주었다. The mechanical properties and SEM micrograph of portland slag cement-amorphous silica(rice husk ash and silia fume) systems were studied with various compositions. Samples were steam cured at 90 and 120℃ for 6, 9, and 12hrs., respectively. The highest compressive strength (793 kg/ ㎠) was abtained the composition in weight ratio of portland slag cement : rice husk ash = 95 : 5 at 120℃-9hr steam curing. SEM micregraphs of the specimens with 5 wt.% RHA steam curing at 120℃-9hrs were more dense than specimen with 5 wt.% SF.

경량 기포콘크리트의 특성에 관한 연구

신현택,정희천 국립경상대학교 공과대학 부설 첨단소재연구소 1991 尖端素材 Vol.1 No.-

The effects of the addition of fly ash and carbon fiber on the mechanical properties of aerated concrete were studied by varing the compositions and curing conditions. Samples were steam cured at atmospheric (90℃-5hrs.) and high pressure (175℃-5hrs.) respectively. The highest compressive and flexural strength (56, 31 ㎏/㎠) was obtained at autoclave curing condition, and optimum composition was in weight ratio of portland cement : fly ash = 55 : 45, which contained 0.4 vol.% carbon fiber. The specific gravity and thermal conductivity of cured cement in autoclave was smaller than that in atmospheric. In the case of autoclave curing (portland cement : fly ash = 55 : 45 ), hydration products were CSH and 11 Åtobermorite, which were considered to the increase of strength.

악관절 강직증의 치험례

현영옥,강창희,노양호,천영두,김신헌,이희원 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.1

Temporomandibular ankylosis is defined as a situation in which the condyle is fused to the fossa by bone or fibrous tissue. Conditons such as trauma, infection, or systemic disease may predispose to various types of ankylosis, bringing about different levels of limitation in mandibular movement. Most patients with temporomandibular ankylosis are associated with limitation of maximal mouth opening, deviation of the chin toward the affected side, impaired occlusion, chronic pain, compromised oral hygiene, severe facial asymmetry & impeded mandibular molar eruption occurring in childhood. Several techniques to release ankylosis have been described in the literature, showing variable and often unsatisfactory results. The most frequently used operations are gap arthroplasty, interpositional arthroplasty, and exicision and joint reconstruction with autogenous or alloplastic materials. We have managed the two patients of TMJ ankylosis. They had previously TMJ surgery and we treated with gap arthroplasty & active physial therapy. We have obtained favorable results and report these cases with literatures review.

교원 근무성적 평정제도 개선에 관한 연구

박천순,신현석 고려대학교 교육문제연구소 1996 敎育問題硏究 Vol.8 No.-

멀티미디어 통신을 위한 인터넷 용량관리 기능

방기천,장희선,신현철 남서울대학교 공학연구센터 2002 공학연구 Vol.3 No.-

The traffic engineering consists of traffic management, capacity management and network planning. In this paper, we present the capacity management function in traffic engineering for next generation multimedia internet services. The link capacity design, shortest-route design and multiple-time network design model is presented. Finally, day-load variation design model and traffic forecasting/reservation model for internet traffic are introduced.

농촌지역 노인들의 우울증상에 관련된 요인들의 특성

송미숙,전기홍,송현종,김정은,박승구,신상건,이동훈,정성현,최연주,최완철,최민규,황재철,홍지만 아주대학교 1997 아주의학 Vol.2 No.2

This study was performed to identify risk factors for depression among the elderly in a rural area. A survey was done for the elderly living in Gosam-myenn, Ansung-kun during the period of July 28, 1997 and July 30, 1997. Demographic and sodoeconornic characteristics, and functional and health Status were assessed using a structured questionnaire, and the level of depression was measured by GDS score. The data obtained were analyzed by frequencies, percentage, t-test, ANOVA, and multiple regression, and the results were as follows: 1. The total sample consisted of 133 elderly. Of them, 47 elderly (35.4%) showed significant depressive Symptoms. 2. The GDS score was the highest for the group over 85 years of age (p < 0.05). Those living alone or widowed showed lower GDS score than those living with someone or married (p < 0.05). 3. The GDS score was the highest in the absolutely dependent group, followed by the partially dependent group, and the independent group (p < 0.01). The elderly who perceived their health Status as excellent showed the lowest GDS score. In contrast, those who had more than five chronic diseases showed the highest GDS score. 4. The elderly receiving financial and emotional support from their family or friends showed lower GDS score compared to those without any support. 5. The economically dependent group showed higher GDS score than that of independent group. 6. The elderly who involved in leisure activities showed lower GDS score than those without any involvement. 7. In terms of risk factors for depression, we found that perceived health Status, subjective economic Status, leisure activities, living arrangement and financial support were inversely associated with GDS score, whereas labor support was positively associated with GDS score. Based upon the above findings, this study suggests that these risk factors for depression in the elderly should be taken into consideration for a comprehensive mental health program for the elderly living in the rural area.

걷기운동이 비만중년여성의 건강관련체력과 피하지방두께변화에 미치는 영향

원영두,문현화,정천모,신명건 朝鮮大學校 스포츠科學硏究所 2007 스포츠科學硏究 Vol.18 No.-

The purpose of this study was to analyze the effect of walking exercise on health-related physical fitness and Subcutaneous fat thickness in obese middle-aged women. SPSS 11.0 was used to calculate mean and SD, and ANCOVA was conducted to examine the group difference between paired sample t-test and pre-test and post-test. The level of significance was set at a=.05. 1. The change of health-related physical fitness was examined, In the EG, there was no statistically significant difference in muscular strength, but there was statistically significant difference in muscle endurance(p<.05), f1exibi1ity(p<.01), and cardivascular endurance(p<.OOl). In the CG, there was no statistically significant difference in all factors. 2. The change of body composition was examined. In the EG, there was statistically significant difference in weight(p<.001) and % body fat(p(.001), but 3. The change of skinfold thickness was examined. In the EG. there was statistically significant difference in triceps. subscapular, midaxillary, abdominal, suprailliac, and popliteal muscles(p<.001) and front thigh(p(.01), but there was no statistically significant difference in medial calf. In the CG, there was no statistically significant difference in all regions. In conclusion, as results of conducting the 12-week walking exercise program for obese middle-aged women, it was found that the program improved health-related and effectively reduced % body fat and skinfold thickness. It is recommended that middle-aged women should do low intensity endurance exercise rather than excessive exercise. Further study should conduct a walking exercise program and a dietary cure together to provide obese middle-aged women with a more effective program.

숯 처리에 의한 녹차 추출액 중 질산태질소 제거 효과

김진우,고영옥,신동국,이 협,전현식,이종옥 진주산업대학교 산업과학기술연구소 2005 산업과학기술연구소보 Vol.- No.12

This experiment was carried out to measure the elimination effect of nitrate nitrogen from green tea extracts through the column system filled with charcoal activated and bamboo charcoal powder compare to that of an nitrate nitrogen standard solution prepared with KNO3 chemicals. The change patterns of pH, and the amount of removed nitrate nitrogen from green tea and nitrate nitrogen standard solution were analyzed according to time course and the amount of charcoal treatments. The results were summarized as follow: 1. pH The pH of Green tea extractions treated with charcoal was high up to 8.17(after 30min treated with 0.4% charcoal) and 8.36(after 60min with 0.4% charcoal) which pH of non-treated green tea (control) was 5.8 The results indicated that the pH values were variable to the treated amount of charcoal and the teated time course. 2. Nitrate nitrogen From the nitrate nitrogen standard solution, the least rate 69.1% and the highest rate 74.5% of nitrate nitrogen were observed to be absorbed through the column treatment (60 min), which with green tea extract solution 21.3% (the least) and 43.8% (the highest) were detected to be absorbed through column treatment (after 60min with 0.4% charcoal). In the case of bamboo treatments with nitrate nitrogen solution samples were showed the least rate 62.8% (30min with 0.1% bamboo) and the highest rate 68.9% (60min with 0.4% bamboo), and with green tea extract solution were observed the least 13.6 (30min with 0.1% bamboo) the highest rate 29.4% (60min with 0.4% bamboo). In general, the elimination activity of nitrate nitrogen was higher by the charcoal activated powder treatment than bamboo charcoal.

한국개비자(Cephalotaxus koreana)의 Harringtonine 과 Homoharringtonine에 관한 연구

이연,박두천,박호일,주우홍,이현채,신동수 昌原大學校 基礎科學硏究所 1996 基礎科學硏究所論文集 Vol.8 No.-

한국산 개비자로부터 alkaloid계통의 성분인 harringtonine과 homoharringtonine의 혼합물을 추출하여 한국산 개비자의 잎, 줄기, 뿌리에서의 harringtonine과 homoharringtonine의 함량은 고속 액체 크래마토그래피에 의해 결정하였다. 두물질의 함량은 서식지, 식물의 부위에 따라 상이하였다. Harringtonine의 함량은 줄기보다 잎과 뿌리에서 높았고, homoharringtonine의 함량은 harringtonin 함량보다 낮았다. 팔공산, 덕유산, 백양산, 지리산 및 남해에서의 잎의 homoharringtonine 함량은 줄기와 뿌리에서 높게 나왔으며, 조계산과 진도에서는 잎의 함량이 뿌리와 줄기에서 보다 낮았다. Harringtonine and homoharringtonine known as anti-cancer agents were isolated from Korean native plumyew (Cephalotaxus koreana). The contents of harringtonine and homoharringtonine in the needles, stems, and roots of Korean native plumyew were determined by high performance liquid chromatography (HPLC). The contents of both compounds varied with the site of location and the part of plant. The content of harringtonine was higher in needles and roots than in stems, whereas the content of homoharringtonine was lower than harringtonine. Homoharringtonine contents in needles at Mt. Palgong, Mt. Dukyu, Mt. Baekyang, Mt. Jiri, and Namhae were higher than in stems and roots. But homoharringtonine contents in needles at Mt. Jokye and Jindo were lower than in stems and roots.