河川水質解析에서 BFGS 技法에 의한 最適反應係數의 決定

朴在弘,金相浩,韓健淵 경북대학교 산업기술연구소 1995 産業技術硏究誌 Vol.23 No.-

QUAL2E model was applied to assess the water quality variations for the downstream of the Han River. The varied flow analysis is performed in the reach of Paldang dam to Indogyo considering the effect of Jamsil submerged weir. A sensitivity analysis was made to determine the significant reaction coefficients and an optimization technique by BFGS method was used to estimate them. The calibration and verification were performed by using observed water quality data for the Han River. The calculated pollutant concentrations showed good agreements with the observed. The predictions of water quality in the river were made for the various discharge conditions and wastewater treatment alternatives.

General Priessmann 技法에 의한 開水路 不定流 解析

朴在弘,韓健淵 경북대학교 산업기술연구소 1993 産業技術硏究誌 Vol.21 No.-

Numerical instability of Preissmann scheme is studied for unsteady flow analysis in open channel. The solution strategies to the instability problems are presented in this paper. The main causes of numerical instability of Preissmann scheme are mixed flow, abrupt change in cross section, inappropriate roughness coefficients, time-distance step, rapidly rising hydrograph, dry bed and so on. To overcome these difficulties, general Preissmann model is developed by introducing distance weighting factor(Φ) and the scheme has more dissipative characteristics than existing Preissmann scheme. Verification with the observed data of a natural channel is required in the future. This model presented in this study is expected to contribute to floodwave analysis using Preissmann scheme.

Zn₁-xFexSe의 고유결함에 관한 연구

박남천,송재홍,채건식,오재근,김영국,손인호 慶南大學校 附設 基礎科學硏究所 1995 硏究論文集 Vol.7 No.-

We studied the native defects of dilute magnetic semiconductors Zn₁-xFexSe epilayer by using SAW device. The energy gap of Zn₁-xFexSe for each epilayer(x=0.0213, 0.0915) was 2.57eV, 2.74eV at room temperature (294K). The trap level for x=0.0213, 0.0915 were calculated by measuring Transverse Acoustoelectric Voltage(TAV). Also we can calculated cross section.

에타놀 投與 흰쥐의 血中 에타놀 濃度와 ADH의 變化

朴載植,朴海根 충남대학교 의과대학 지역사회의학연구소 1987 충남의대잡지 Vol.14 No.1

It is generally accepted that ethanol has the diuretic action in the human beings by the inhibition of ADH(antidiuretic hormone) secretion. However, contribution of ethanol to body fluid change and blood ethanol curve in the rat has not been studied satisfactorily. Thus, the following experiment was performed to examine the change of blood ethanol concentration and the body fluid after ethanol administration in the Sprague Dawley female rats which were divided into 2 groups: control and ethanol-administered group. A single dose of one ml of 25% ethanol (ethanol group) or water(control group) per 100gm body weight was administered. On the day of experiment, the rat was anesthetized with ether and catheterized in the femoral artery for sampling of arterial blood. The catheter was filled with heparin solution. Blood sampling was done at least 3 hours after the surgery. Blood ethanol concentration was measured by the alcohol dehydrogenase enzyme method and ADH by radioimmunoassay. The results obtained are summarized as follows. The formula representing the blood ethanol concentration, C(mg/dl), after ethanol administration as a function of time, t(hour), was C=126.57(1-e^-2l.036t)-16.59t and showed more rapid absorption and metabolism of ethanol in the rats than in human beings. Plasma ADH concentration was 3.4±0.4pg/ml at rest but was decreased significantly at 30 and 120 minutes after ethanol administration. A gradual decrease in hematocrit was produced by continuous blood sampling but ethanol group showed higher hematocrit values than control. A significant increase of corrected osmolality was observed compared with the control, particularly at 30 and 60 min after ethanol administration and urine volume was also increased in the first 2 hours. From these results it was concluded that in the rats the rates of ethanol absorption and metabolism was rapid and ADH secretion was decreased for 2 hours after ethanol administration. Subsequently, the solute free urine volume and corrected osmolality was increased followed by plasma volume shift from the vessel. After 2 hours, though blood ethanol concentration was still high, corrected osmolality and urine volume was recovered to the original value.

蛇行 河川에서 洪水波의 傳達 特性 解析

朴在弘,孫廣翼,韓健淵 경북대학교 산업기술연구소 1993 産業技術硏究誌 Vol.21 No.-

Unsteady flow in a natural river which meanders through a wide flood plain is complicated by large differences in hydraulic resistance and cross sectional geometry of the river channel and the floodplain. The unsteady flow is further complicated by the tendency for a portion of the flow to short-circuit along the more direct route afforded by the flood plain rather than following the longer route along the meandering channel. A mathmetical model for routing floods in meandering river with floodplains is presented. The one-dimensional equations modified such that the flow in the meandering channel and floodplain are identified separately. The floodplain model has been used to simulate flow in an idealized meandering river with a flood plain. Flood peak attenuation and travel time are found to increase as flood-plain roughness and width increase and as channel sinuosity decrease. Attenuation increase and travel time decreases as the flood plain flow increases.

LCA 를 통한 가전제품 폐기단계의 환경부하 및 주요 환경영향 규명

박필주,노재성,이건모 한국전과정평가학회 1999 한국전과정평가학회지 Vol.1 No.1

전과정평가는 원료취득 및 가공, 제품제조, 사용 및 폐기단계에서 발생되는 환경부하를 정량화하고 이들이 환경에 미치는 영향을 평가하는 과정으로 이루어진다. LCA 결과의 신뢰도를 제고시키기 위해서는 제조단계나 사용단계와 마찬가지로 폐기단계도 중요한 공정으로 간주되어야 한다. 여기서는 노동-자본 결합형 재활용 기술을 적용한 폐가전제품 처리방법에 대해 조사하였으며, 재활용공정과 소각공정을 중심으로 국내 상황을 고려한 데이터베이스를 구축하였다. 또한, 냉장고의 폐기단계 LCA를 수행하여 주요이슈를 규명하였다. 주요이슈 규명은 각 영향범주별 주요이슈 규명과 전체 시스템의 주요이슈 규명의 두가지 방법에 의해 수행되었다. 수행결과 분해공정, Cabinet foam, 단열재공정이 주요 이슈로 규명되었으며, 냉매제의 대기 방출, PCB 소각 등으로 인한 환경부하가 전체의 50% 이상을 차지하는 것으로 나타났다. 또한 지구온난화, 인간독성(대기), 산성화 등의 영향범주에 큰 영향을 미치는 것으로 나타났다. Life Cycle Assessment(LCA) is a procedure evaluating environmental burdens associated with a product, process, or activity from raw material aquisition to disposal. Disposal phase as well as manufacturing or use phase should be considered as an important process in order to evaluate confidence in the LCA results. In this study, we examined the application of management method involved with manpower-capital conbined recycling technique on home appliances in disposal phase. Database, considered as national specific situation, recycling processes and incineration has been established. Also, we carried out the LCA on a refrigerator in the disposal phase and identified the key issues. Two methods for the identification of key issues were studied, one for impact category and the other for whole system. As a result, Identified key issues are disassembly, cabinet foam, urethane. So are coolant, PCB incineration. These are more than 50% of whole environmental burdens. Also, The value of global warming, human toxicity of air emission, and acidification are high.

Polymerase Chain Reaction을 이용한 결핵성 뇌막염의 조기진단

김재우,이상건,하경민,박웅양 동아대학교의과대학 1992 동아의대학술지 Vol.4 No.1

日本의 海岸砂防에 관한 연구(II) : 沖繩縣의 海岸保安林을 중심으로;On Seaside Protection Forest in Okinawa Prefecture

全槿雨,李在善,朴完根,幸喜善福,中島勇喜,江崎次夫 江原大學校 森林科學硏究所 2004 Journal of Forest Science Vol.20 No.-

우리나라에 있어서 海岸林의 多面的 機能과 時代的 價値觀의 변화를 파악하고, 海岸砂防의 참고자료를 얻기 위해 일본의 海岸林과 海岸砂防에 대한 각종 자료를 수집·분석하고 있다. 전보(全槿雨 등, 2002)에 이어 日本 沖繩縣의 海岸防災林을 중심으로 海岸林의 槪要, 海岸保安林의 實態와 각 島嶼別 주요 海岸砂防用 樹種 및 대표적인 海岸保安林에 대하여 분석·정리하였다. Management system of coastal erosion-control forest in Japan together with coast sand dune fixation and stabilization were investigated and analyzed to introduce to Korean researchers the many-sided importance and function of coastal forest and its chage from the standpoint of social value. In this study some suggestions and ideas were proposed for establishment of coastal forest including some suggestions and idea were proposed for establishment of coastal forest including seaside protection forest characteristics and tree species for coastal dune fixation, based on the analysis of date which were collected from the seaside protection forest in Okinawa Prefecture in Japan.

Priming 처리종자의 저장기간에 따른 발아력 전당함량 및 α-amylase 활력

김재현,이석순,박성태,정명근 한국국제농업개발학회 2002 韓國國際農業開發學會誌 Vol.14 No.3

벼 종자의 priming처리 후 저장성을 검토하기 위하여 저장기간과 저장온도에 따라서 종자의 발아력과 저장양분 및 발아에 관여하는 주요 효소활력의 변화를 조사한 결과를 요약하면 다음과 같다. 1. Priming한 종자를 6개월간 저장하여도 어느 저장온도에서나 발아율의 차이가 없었다. 2. Priming한 종자에서 발아속도(T_50)가 2∼3일 빨랐으며 3개월 동안은 변화가 없었고 3개월 이후 발아속도가 약간 감소하였으나 priming 처리하지 않은 종자에 비해서 빨랐다. 3. 발아균일도는 priming 처리효과가 6개월간 계속 유지되었으며 25℃보다 저온인 17℃에서 효과가 더 크게 나타났다. 4. α-amylase 활력은 저장기간이 길수록 높았고 전당함량의 경우 3개월 이상 저장하였을때 감소하였으나 발아력에는 영향을 미치지 않았다. 5. 종자 수확후 6개월 동안은 어느 시기에 priming 처리하여 저장하여도 발아력 및 종자의 활력은 유지되었다. This experiment was carried out to determine changes of seed germination ability, total sugar, and α-amylase activity to different storage period, and temperature after seed priming treatment. In the storage during the six months, final germination rate and speed were similar to the untreated control seeds and the uniformity was continuously preserved. Germination speed(T_50) was faster than the control seeds by 2∼3 days. T_50 was a little decreased to priming effect after three months but faster than the control seeds. In the case of germination temperature 25℃, germination uniformity was decreased to long term storage periods. Total sugar content was increased to compare with the control seed during the one months at -10, 5 and 20℃ and total sugar content was decreased after two months. α-amylase activity was increased to storage of long term period and seed of storage temperature 5℃ was increased compared with -10 and 20℃. Germination ability and α-amylase activity was preserved continuously during six months after priming treatment.

한국인 제2형 당뇨병 환자에 있어 지속적 피하 인슐린 주입법 치료시 Lispro insulin와 Regular insulin의 효과 비교

유재등,박봉안,류하근,류주성,김정수,김치훈,박선민,최수봉 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

Objective: The Lispro insulin has faster onset of effects and shorter duration than the human regular insulin, an analog of human insulin. The differences in the pharmacodynamics between the two types of insulin in the continuous subcutaneous insulin infusion(CSII) with insulin pump for treating the Korean Type 2 DM patients were analyzed. The effects on the regulation of blood sugar, the amount of insulin injected, and the frequency of hypoglycemia were compared between the lispro insulin and the regular human insulin. Method and Material: One hundred and three Korean Type 2 DM patients were randomly divided into two groups, 49 Lispro insulin and 54 Regular insulin.(Table 1) Both groups were treated for 14 days. Also at a set time before meal, insulin was injected as bolus, using a portable insulin pump, in both groups, 15 minutes before for lispro insulin and 30 minutes before for human insulin The HbA1C, C-peptide, AC/PC, height and weight were measured for each patients at the time of admission. The peripheral blood sugar level and insulin injection profile were recorded 7 times per day for each patients. Results: After treating for 7 days and 14 days, the blood sugar level normalized in both groups. There weren't any significant differences in blood sugar levels in both groups at point of the study, and also there weren't any differences in the frequency of hypoglycemia. In order to maintain the normalized blood sugar level, the lispro insulin group had higher total daily insulin requirement than the regular insulin group after 14 days of treatment (0.90±0.35 vs 0.73±0.39u/kg/day, p<0.05) This difference is probably due to the difference in basement insulin requirements rather than prandial insulin requirements (0.32±0.1 vs 0.43± 0.09u/kg/day, p<0.001). Discussion: In the hospitalized Korean Type 2 DM patients with CSII treatment, continuous subcutaneous insulin infusion therapy using lispro insulin has convenience in usage compared to the regular insulin. However, there were not any differences in the blood sugar levels. Also lispro insulin requires more insulin in order to maintain normal blood sugar level, which is probably due to the increase in the basal requirement. Also there were not any difference in the frequency of hypoglycemia.