• 약학회지
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• 제39권5호
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• pp.480-486
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• 1995

The change in discharge current of a glow discharge has been shown the potential sensitive detector for gas chromatography. To investigate the effect of carrier gas on the electrical characteristics of the discharge and the peak response, the discharge pressure, gas flow rate, and discharge gap have been studied. The discharge gas included the Ar, He, and N$_{2}$. The gas flow rate has been found one of the important parameters to affect both the electrical characteristics and the peak response.

• Archives of Pharmacal Research
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• 제16권2호
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• pp.129-133
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• 1993

Temperature sensitive liposomes(TSL) containing adriamycin (ADM) and cytarabine (Ara-C) were prepared. ADM and Ara-C were selected as model compounds of amphiphilic and hydrophilic drug, respectively. Encapsulation efficiency of ADM entrapped into TSL was about twice greater than that of Ara-C. It might be due to different polarity of the drug, Lipid compositions of TSL had no effect on the encapsulation efficiency of drugs. Thermal behavior of TSL using a differential scanning calorimetry (DSC) was also investigated. Phase transition of TSL using a differential scanning calorimetry (DSC) was also investigated. Phase transition temperature $(T_c)$ of TSL was dependent on the lipid compositions of TSL ADM broadened thermogram of TSL but Ara-C did not. However, $T_c$ of TSL was not changed by any drug. Release rate of drugs was highly dependent on temperature. The release profile of ADM was similar to that of Ara-C. The maximum release rate of drugs from TSL was occurred at the near $T_c$ and observed at $39-41^\circ{C}$ for DPPC (Dipalmitoylphosphatidylcholine) only, $52-54^\circ{C}$ for DPPC and DSPC (1:1), respectively. Effect of human serum alburmin (HAA) on the release rate of ADM was investigated. HSA had no significant effect on the release of ADM below $T_c$. However, ADM release from TSL was increased at the near and above $T_c$. The HSA-induced leakage of drug may result from the interaction of liposomal constituents with HSA structure at the near TEX>$4^\circ{C}$. From the fact that the release profiles of ADM from freshly prepared TSL and stored TSL for 1 week at TEX>$4^\circ{C}$ was not changed, the TSL was considered to be stable for at least 1 week at TEX>$4^\circ{C}$. Based on these findings, TSL may be useful to deliver drugs to preheated target sites due to its thermal behaviors.

• 아태비즈니스연구
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• 제9권4호
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• pp.67-84
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• 2018

This study is about comparing coal thermal plant to LNG combined power plant in respect of environmental and economic cost analysis. In addition sensitive analysis of power cost and discount rate is conducted to compare the result of change in endogenous and exogenous variable. For environmental assessment, when they generate 10,669GWh yearly, coal thermal power plant emits sulfur oxides 959ton, nitrogen oxide 690ton, particulate matter 168ton and LNG combined power plant emits only nitrogen oxide 886ton respectively every year. Regarding economic cost analysis on both power plants during persisting period 30 years, coal thermal power plant is more cost effective 4,751 billion won than LNG combined taking in account the initial, operational, energy and environmental cost at 10,669GWh yearly in spite of only LNG combined power plant's energy cost higher than coal thermal. In case of sensitive analysis of power cost and discount rate, as 1% rise or drop in power cost, the total cost of coal thermal power plant increases or decreases 81 billion won and LNG combined 157 billion won up or down respectively. When discount rate 1% higher, the cost of coal thermal and LNG combined power plant decrease 498 billion won and 539 billion won for each. When discount rate 1% lower, the cost of both power plant increase 539 billion won and 837 billion won. With comparing each result of change in power cost and discount rate, as discount rate is weigher than power cost, which means most influential variable of power plan is discount rate one of exogenous variables not endogenous.

• Journal of Chest Surgery
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• 제21권1호
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• pp.109-115
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• 1988

With the decreasing incidence of new cases and the highly effective results with antituberculous drug therapy, there is a marked decline in the need for surgery which was formerly such an important part in the successful program of management of this disease. During the period of two years and a half from Jun. 1984 to Dec. 1986, this study represents an analysis of 163 cases of several surgical management for eventual control of pulmonary tuberculosis at National Kon-ju tuberculosis Hospital. 1. Mode of surgical treatment was: Resection; 123 cases [Pneumonectomy: 83, lobectomy: 35, lobectomy plus segmentectomy; 4 segmentectomy: 1], thoracoplasty: 20 and others: 20. 2. Age distribution ranged 16and 68 with average of 34 years. Male and female ratio was 1.2: 1. 3. Surgical indications were: totally destroyed lung; 64, Destroyed lobe of segment; 13, cavity positive sputum; 10, cavity c negative Sputum; 6, Bronchostenosis c atelectasis; 2, empyema c or s BPF; 46, Aspergilloma; 8, Questions of Associated tumor; 4 and other 5. 4. Incidence of Complications was 10.4% and the mortality was 5.5 percent. The cause of mortality were analyzed. The main causes of death were respiratory insufficiency; 4, fulminant hepatitis; 1, hemorrhage; 1 and unknown; 1 in pneumonectomy, and asphyxia; 1 in lobectomy and sepsis; 1 in other procedure. 5. Conversion rare of positive sputum to negative state related to resectional surgery was 91.5%. In pneumonectomy, drug resistant group preoperatively showed 88.1% conversion rate postoperatively and drug sensitive group showed that 100% conversion rate. In lobectomy, both drug resistant and sensitive groups showed that 100% conversion rate postoperatively.

• 센서학회지
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• 제4권3호
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• pp.15-21
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• 1995

본 논문은 졸겔법에 의해 $TiO_{2}-V_{2}O_{5}$ 습도센서를 제조하고, 미세구조 및 결정구조를 분석하여 습도감지특성이 뛰어난 최적 제조조건을 찾았다. 그레인 크기는 $Ti^{4+}$ 사이트에 치환되는 $V^{5+}$비에 비례하여 증가하였다. X-선 회절분석 결과, $V_{2}O_{5}$비에 관계없이 $V^{5+}$피크는 확인할 수 없었다. 실험결과로부터 $V_{2}O_{5}$비가 1mol%, 열처리온도가 $700^{\circ}C$일때 가장 우수한 습도감지특성을 나타내었다. 시편의 정전용량은 주파수가 증가할수록 감소하였다.

• Journal of Communications and Networks
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• 제16권2호
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• pp.130-139
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• 2014

Due to the unpredictable nature of channel availability, carrying delay-sensitive traffic in cognitive radio networks (CRNs) is very challenging. Spectrum leasing of radio resources has been proposed in the so called coordinated CRNs to improve the quality of service (QoS) experienced by secondary users (SUs). In this paper, the performance of coordinated CRNs under fixed-rate with hard-delay-constraints traffic is analyzed. For the adequate and fair performance comparison, call admission control strategies with fractional channel reservation to prioritize ongoing secondary calls over new ones are considered. Maximum Erlang capacity is obtained by optimizing the number of reserved channels. Numerical results reveal that system performance strongly depends on the value of the mean secondary service time relative to the mean primary service time. Additionally, numerical results show that, in CRNs without spectrum leasing, there exists a critical utilization factor of the primary resources from which it is not longer possible to guarantee the required QoS of SUs and, therefore, services with hard delay constraints cannot be even supported in CRNs. Thus, spectrum leasing can be essential for CRN operators to provide the QoS demanded by fixed-rate applications with hard delay constraints. Finally, the cost per capacity Erlang as function of both the utilization factor of the primary resources and the maximum allowed number of simultaneously rented channels is evaluated.

• 소성∙가공
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• 제7권6호
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• pp.570-574
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• 1998

The texture evolution during deep drawing of AA1050 sheets was experimentally investigated and the lattice rotation rate was predicted using rate sensitive model with full constraints boundary conditions. The measured textures are dependent on the amount of the flange deformation and the initial crystal orientations. In the specimen parallel to RD the initial crystal orientations and the D component rotated toward the Cu component and the initial crystal orientations along the $\alpha$ fiber rotated toward the G {1 1 0}<0 0 1> and P {1 1 0} <1 1 1> components during deep drawing. In the specimen parallel to $45{\circ}$ with respect to RD the initial crystal orientations around the D component rotated about ND and the initial crystal orientations along the ${\alpha}$ fiber also rotated toward the (1 1 0) [2 3] and (1 1 0)[2 7] components about ND. In the specimen parallel to TD. the initial crystal orientations around the D component rotated toward the rotated cube and the initial crystal orientations along the ${\alpha}$ fiber rotated toward the {1 1 0} <1 1 3> component.

• 수산해양교육연구
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• 제20권1호
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• pp.78-89
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• 2008

This study is intended to analyse the economic sensitivity of imported fishery products due to decrease in or elimination of tariff rates through the progress of free trade. Forty-seven species of fishes were selected for this study on the basis of the HS Code. The substitution and price effects were calculated using the price elasticities of both domestic and imported demands for fishery products under the assumption of 5% decrease in a tariff rate. Seven main economic variables were extracted from the fishery industry which can mediate the substitution and price effects. A multiple regression analysis was conducted to obtain the influence weights of these main economic variables on both effects. The order of sensitivity of the fishes was calculated using these weights. The 47 fish species were classified into four groups according to their sensitivity based on the means and the standard deviations of their total scores on seven main economic considerations. Nine fish species such as squids, hair tails, shellfishes, and crabs belonged to the hyper-sensitive group, whereas 15 fishes such as eels, sea breams, and sea weeds belonged to the sensitive group. Twelve species including common sea basses, cods, and abalones were among the less-sensitive group, and 11 species including skate rays and mud fishes comprised the non-sensitive group.

• 한국미생물·생명공학회지
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• 제27권1호
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• pp.8-14
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• 1999

This study was developed to evaluate the growth inhibition effects of cell wall components of Enterococcus faecalis 2B4-1 obtained from feces of neonates against tumor cell lines. Polysaccharide fraction (PS) shown sensitive growth inhibition effect in the cell wall components was isolated and characterized. In growth inhibition effects, residue fractin of whole cell was shown sensitive level of percent survival about 30% when administrated at ehe concentration of 100${\mu}$g/ml, and that was more effective than that of supernatant fraction against the tumor cell lines, SNU-1, 3LL, FARROW and HEC-1-B. Sensitive growth inhibition effects against SNU-1, FARROW and HEC-1-B were performed by whole cell (WC) fraction from Ent. faecalis 2B4-1. Cytoplasm fractin (CP) of WC was shown non-inhibition effect, however, the other part of WC, precipitate of disrupted cell (PD), was sensitive against the tumor cell line mentioned above. Followed by separation to peptidoglycan fraction (PG) and polysaccharide fraction (PS) were all sensitive which the latter was shown more sensitive percent survival than the former. Composed sugars of polysaccharide fraction were determined to D-glucose, L-rhamnose and D-glucosamine, and the rate fo composition was calculated to about 1:1:1 by the data of elemental analysis, IR, TLC and HPLC.

• 한국지반환경공학회 논문집
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• 제4권3호
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• pp.69-77
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• 2003

대청호에서 WASP5 모델의 매개변수를 산정하고 민감도분석을 실시하였다. 모델의 계산치와 실측치는 값과 그 경향에 있어 근사한 것으로 나타나 이를 통해 대전취수탑 유역의 장래수질예측이 가능하였다. 매개변수의 민감도분석 결과 조류의 최대성장율, 조류의 호흡율, 광소멸계수, 온도 등이 Chlorophyll-a에 가장 큰 영향을 주는 것으로 나타났으며 T-N에 영향을 주는 주된 인자는 용존유기질소 분해율과 온도이며 T-P는 인부하량, 온도, 광소멸계수, 용존유기인 분해율, 조류의 최대성장율 등의 순으로 영향을 받는 것으로 나타났다. BOD에 큰 민감도를 보인 인자는 탈산소계수와 온도였으며, DO는 온도 외의 매개변수에 대한 영향은 거의 없는 것으로 나타났다. 모델의 민감도분석을 통하여 해당 수역에 적합한 입력변수의 민감도에 대한 평가를 하였으며 각 수질항목에 대한 입력변수의 영향에 대한 파악을 통해서 모델의 적용에 주의를 기해야할 해당 입력변수의 구분이 가능하였다.