• Asian-Australasian Journal of Animal Sciences
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• 제7권2호
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• pp.201-205
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• 1994

Thirty buffalo calves were randomly categorized into three groups on the basis of age, i.e. birth to 6 months; 6 to 12 months and 12-24 months. Blood samples were collected to monitor certain vital metabolites in relation to age and prediction of performance in growing buffalo calves. Amongst the various blood parameters estimated the serum glucose, cholesterol and gamma globulins have shown highly significant correlations with age and live weight-gain of the animal as well. However, the multiple regression analysis clearly indicated the influence of age and live body weight on blood metabolites in buffalo calves.

• 한국대기환경학회지
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• 제4권1호
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• pp.13-22
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• 1988

Interactions between hydrodesulfurization of thiophene and hydrodenitrogenation of pyridine and the kinetic analysis were studied over $Ni-W/\gamma-Al_2O_3$ catalysts and this study was made at temperatures ranging from 473-673 K and at total pressures ranging from 10-25 $\times 10^5$ Pa. Hydrodesulfurization of thiophene was inhibited by presence of pyridine at all temperatures studied, and the rate of pyridine hydrodenitrogenation was slower than that of thiophene hydrodesulfurization in the operating conditions. Pyridine hydrodenitrogenation was also inhibited by the presence of thiophene at low temperatures but was enhanced by the thiophene at temperatures higher than 613K. Thiophene reaction rate was determined by multiple linear regression analysis using Langmuir-Hinshelwood-Hougen-Watson model and the result was given to be $r = kP_T^p_H/(1+K_Tp_T+K_Pp_P)^2$. At each temperature, reaction rate constants and absorption equilibrium equilibrium constants were determined and the activation energy was 12.98 kcal/gmol from Arrhenius plot.

• 물과 미래
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• 제23권4호
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• pp.421-434
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• 1990

Horton의 차수법칙을 이용한 지형학적 수문응답모델로서 하천유역 상호간의 수문학정 상사성 문제를 해석하였다. 지형학적 응답함수의 구성은 Nash 모델을 이용하였으며, 응답함수의 최적화는 불완전 감미함수와 Rosso가 유도한 회귀방정식을 이용하였다. 본 방법의 적용성을 검토하기 위해 평창강 유역, 위천유역 그리고 보청천 유역에 대한 실측치를 이용하였으며, 수문응답에 대한 재현성을 모멘트법과 비교하였다. 분석결과 응답모델과 무차원 순간단위도는 미계측 유역의 유출해석이나 유역의 상사상 해석에 대해 적용할 수 있다고 판단되었다.

• Preventive Nutrition and Food Science
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• 제5권1호
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• pp.20-24
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• 2000

A study was carried out to establish the detection method of irradiated corn, potato, and sweet potato starches. The samples were packed in polyethylene bags and irradiated with 1, 3, 5, 7, 10, and 15 kGy using a Co-60 irradiator. The maximum viscosity of irradiated and unirradiated corn, potato, and sweet potato starches reduced by increase of irradiation dose levels and showed significant differences which clearly showed the effect of irradia-tion dose levels (p<0.05). Regression expressions and coefficients (p<0.000) or corn, potato, and sweet potato starches were y=-38.538x+718.23(r2=0.9761), y=669.97e-0.1372x (r2=0.9820) and y=-42.544x+730.26(r2=0.9939), respectively. Nor-malized parameter A,B and C values showed a dose dependent relationship and were a better parameter for detecting the irradiated starches than that of the maximum viscosity itself.

• 응용통계연구
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• 제25권6호
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• pp.1037-1047
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• 2012

The generalized linear mixed model(GLMM) is widely used in fitting categorical responses of clustered data. In the numerical approximation of likelihood function the normality is assumed for the random effects distribution; subsequently, the commercial statistical packages also routinely fit GLMM under this normality assumption. We may also encounter departures from the distributional assumption on the response variable. It would be interesting to investigate the impact on the estimates of parameters under misspecification of distributions; however, there has been limited researche on these topics. We study the sensitivity or robustness of the maximum likelihood estimators(MLEs) of GLMM for counts data when the true underlying distribution is normal, gamma, exponential, and a mixture of two normal distributions. We also consider the effects on the MLEs when we fit Poisson-normal GLMM whereas the outcomes are generated from the negative binomial distribution with overdispersion. Through a small scale Monte Carlo study we check the empirical coverage probabilities of parameters and biases of MLEs of GLMM.

• 대한간호학회지
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• 제15권1호
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• pp.52-58
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• 1985

This study was attempted to investigate the main factors affecting health perception of the patients following cardiac valve replacement surgery. Data were collected from Sept. 1 to Oct. 31, 1984 through administration of questionnaire developed for this study by the researcher. The subject was 95 patients who received follow up care following cardiac valve replacemert surgery at S.N.U.H. The data were analyzed by T-test, oneway ANOVA, pearson correlation and multiple regression according to dependent variables. The results were as follows. \circled1 Average self-health perception of those patients. were 4.62, (maximum; 7 minimum; 1) and they showed on affirmative response for their health condition, \circled2 There was significant difference in health perception according to sex difference. Men had higher health perception than women. (t=2,83, p=0.006) \circled3 There was significant difference in health perception according to occupation. Those who had occupation showed higher health perception those who had no occupation. (t=3.25, p=0.002) \circled4 The longer post-operative period elapsed, the higher health perception was, and there was significant difference in health perception (f=0.2958, p=0.002). \circled5 The higher age was, the lower health perception was, and there was a significant difference in health perception. (${\gamma}$= -0.2485, p=0.008) \circled6 The fewer subjective psychosomatic symptoms were, the higher health perception was, and there was a significant difference in health perception. (f = -0.4988, p=0.0000) \circled7 The more active daily activities were, the higher health perception was, and there was a significant difference in health perception. (${\gamma}$=0.6359 p=0.0000) \circled8 The main factors predicting health perception .are like these. \circled1 Daily activities (42.7%), highest variable. \circled2 Psychosomatic symptoms (7.29%) \circled3 Elapsed period after cardiac valve replacement surgery (1.89%) \circled4 Existence of occupation (1.87%) \circled5 Sex (1.78%) \circled6 Age (0.8%).

• 공업화학
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• 제10권1호
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• pp.85-92
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• 1999

고정층 촉매 반응기를 이용하여 ${\gamma}$-알루미나에 담지한 크롬산화물 촉매상에서 vinyl chloride의 완전산화잔응을 $240{\sim}300^{\circ}C$의 온도와 600~3,500 ppm의 농도범위에서 조사하였다. 반응은 vinyl chloride의 농도에 대하여 비선형적으로 변하였으며, 산소의 농도에 대하여는 0차 거동을 보였다. 또한 반응 생성물인 $H_2O$와 HCl를 반응물에 첨가하였을 때 vinyl chloride의 전환율에 영향이 거의 없었다. Vinyl chloride의 산화반응에 대한 몇 가지 반응모델을 가정하고 실험결과와 상관시켜 가장 잘 일치하는 모델을 도출하였다. 속도식의 해석결과 vinyl chloride의 산화반응은 산소로 피복된 촉매표면에 vinyl chloride가 흡착한 후 산화분해되며, vinyl chloride가 촉매표면에 흡착하여 반응을 방해한다는 가정하에서 도출된 반응속도 모델이 실험결과를 가장 잘 표현하였다. 실험치와 예측치간의 표준편차 백분율은 약 5.2% 정도였으며 활성화에너지는 18.9 kcal/mol으로 계산되었다.

• Journal of Korean Neurosurgical Society
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• 제58권4호
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• pp.379-384
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• 2015

Objective : To investigate the risks and pattern of evolution of peritumoral brain edema (PTE) after stereotactic radiosurgery (SRS) for asymptomatic intracranial meningiomas. Methods : A retrospective study was conducted on 320 patients (median age 56 years, range 24-87 years) who underwent primary Gamma Knife radiosurgery for asymptomatic meningiomas between 1998 and 2012. The median tumor volume was 2.7 cc (range 0.2-10.5 cc) and the median follow-up was 48 months (range 24-168 months). Volumetric data sets for tumors and PTE on serial MRIs were analyzed. The edema index (EI) was defined as the ratio of the volume of PTE including tumor to the tumor volume, and the relative edema indices (rEIs) were calculated from serial EIs normalized against the baseline EI. Risk factors for PTE were analyzed using logistic regression. Results : Newly developed or increased PTE was noted in 49 patients (15.3%), among whom it was symptomatic in 28 patients (8.8%). Tumor volume larger than 4.2 cc (p<0.001), hemispheric tumor location (p=0.005), and pre-treatment PTE (p<0.001) were associated with an increased risk of PTE. rEI reached its maximum value at 11 months after SRS and decreased thereafter, and symptoms resolved within 24 months in most patients (85.7%). Conclusion : Caution should be exercised in decision-making on SRS for asymptomatic meningiomas of large volume (>4.2 cc), of hemispheric location, or with pre-treatment PTE. PTE usually develops within months, reaches its maximum degree until a year, and resolves within 2 years after SRS.

• Asian-Australasian Journal of Animal Sciences
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• 제23권8호
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• pp.1089-1095
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• 2010

Four biological candidate genes, natural resistance associated macrophage protein 1 (SLC11A1 or NRAMP), prosaposin (PSAP), interferon Gamma (IFNG), and toll-like receptor 4 (TLR4), were examined to identify single nucleotide polymorphisms (SNP) and associations of the SNP with antibody response kinetics in hens. An $F_2$ population was produced by mating $G_0$ highly inbred (<99%) males of two MHC-congenic Fayoumi lines with highly inbred Leghorn hens. The $F_2$ hens (n = 158) were injected twice with SRBC and whole, fixed Brucella abortus (BA). Blood samples were obtained before each immunization, at 7 d after primary immunization, and at several time points after secondary immunization. Minimum titers (Ymin) and the time needed to reach them (Tmin), and maximum (Ymax) titers and the time needed to reach them (Tmax), were estimated from the seven post-secondary immunization titers using a nonlinear regression model. The $F_2$ hens were genotyped for the four candidate genes by using PCR-RFLP for one SNP per gene, which identified the parental allele. General linear models were used to test associations of SNP genotypes with antibody response parameters and BW measured at 4 ages. The IFNG SNP was highly significantly (p<0.0125) associated with primary response to SRBC, Tmin to BA, Ymin to BA, and 12-week BW. The current study demonstrated that the novel IFNG promoter SNP was associated with antibody kinetics for BA and SRBC in laying hens, and also with BW, suggesting that this cytokine may play a pivotal role in the relationship between immune function and growth.

• 대한토목학회논문집
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• 제10권1호
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• pp.99-108
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• 1990

지형화적 순간단위도 이론을 이용하여 강우-유출 수문곡선을 재현할 수 있는 합성단위도법을 연구하였다. 지형학적 순간단위도는 Gupta등이 제한한 이론을 이용하였고, 응답함수는 2변수 감마분포를 사용하였다. 응답함수의 매개변수결정은 Rosso가 유도한 Horton의 지형법칙에 대한 회귀방정식과 유역지체시간의 저유계수에 대한 상관식을 이용하였다. 유도된 합성단위도의 적용성을 검토하기 위해 한강수계의 평창강과 낙동강수계의 위천유역에 대한 실측치와 비교하였다. 그리고 모멘트법과 불안전 감마함수를 사용한 최소자승법을 이용하여 수문응답의 재현정도를 비교 검토함으로서 본 연구에서 확립된 방법의 적용 타당성을 입증하였다. 분석결과 유도된 합성단위도는 첨두유량, 도달시간 그리고 수분곡선의 실측치에 대한 재현성이 비교적 높았으며, 미계측 유역의 유출해석에 중요한 수단을 제공할 것으로 판단되었다.