Kim, Yong-Soon;Song, Moon-Yong;Kim, Jin-Sik;Rha, Dae-Sik;Jeon, Yong-Joon;Kim, Ji-Eun;Ryu, Hyeon-Yeol;Yu, Il-Je;Song, Kyung-Seuk
Toxicological Research
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v.25
no.3
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pp.140-146
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2009
This study was performed to evaluate the toxicity of cadmium selenide for a period of 28 days in Sprague-Dawley rats. Each of 10 healthy male and females rats per group received daily oral administration for 28-day period at dosage levels 30, 300 and 1,000 mg/kg of body weight. Mortality and clinical signs were checked, and body weight, water intake and food consumption were also recorded weekly. There were no dose-related changes in food consumption or urine volume. All animals survived to the end of study with no clinical signs or differences in body weight gain observed when compared with the control group. At the end of study, all animals including control group, were subjected to necropsy. Blood samples were collected for hematology tests including coagulation time and biochemistry analysis. Blood coagulation time and relative organ weight were unaffected by all received doses. White Blood Cell (WBC) counts significantly increased in the 300 mg/kg administered male animal group when compared to the control. Monocyte (MO) value were also increased significantly in both 300 and 1,000 mg/kg male animal group. However, Mean Corpuscular Volume (MCV) were significantly decreased compared with the control in the 1,000 mg/kg dose groups for male and female animals. Mean Corpuscular Hemoglobin (MCH) decreased significantly for female in the 300 and 1,000 mg/kg group compared to the control. Blood biochemical values of Inorganic phosphorus (IP) were significantly increased in both the 300 and 1,000 mg/kg dose groups in male animals when compared to the control. Creatinine (CRE) levels indicated significant increase in kidney function for the female, 30 mg/kg dose group when compared with control. There was a significant decrease in thymus absolute organ weight in the female, 1,000 mg/kg dose group when compared with control. Histopathological findings revealed no evidence of injury related to cadmium selenide except for one case of focal hepatic inflammation in the high dose (1,000 mg/kg) group. One case of lung inflammation was also seen in the control group. Basis on these result, the No Observable Adverse Effect Level (NOAEL) of cadmium selenide was determined to be more than 1,000 mg/kg/day for male and female rats under conditions in this study.
We performed exercise radionuclide ventriculography to evaluate left ventricular (LV) function in 35 patients with pure mitral stenosis (MS). There were 6 males and 29 females ranging from 21 to 63 years of age (mean $37{\pm}10$ years). We also studied 8 healthy men as control group (mean age $27{\pm}5$ years). Each patients was evaluated at rest and during maximal exercise on an isokinetic bicycle ergometer. Peak filling rate (PFR), peak ejection rate (PER), ejection fracion (EF), end-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV), and cardiac output (CO) were determined by the radionuclide technique. The results were summarized as follows: 1) LV systolic dysfunction and reduced PFR were noted in patients with MS. 2) EDV as well as SV decreased with exercise in patients with MS. 3) No significant increase in EF during exercise compared to rest value was observed because it was caused by reduced EDV and SV during exercise in patients with MS. 4) CO increased with exercise was significantly lower than normal in patients with MS. 5) Patients with MS were divided into two groups according to whether SF increased more than 5% druing exercise compared to resting state or decreased. Significant difference were found between these two groups. Patients with a fall in EF with exercise were older, had larger left atrial size, and had lesser decreased in ESV during exercise.
Journal of the Korea Institute of Information and Communication Engineering
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v.13
no.4
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pp.765-773
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2009
Currently Telematics traffic information services have been various because we can collect real-time traffic information through Intelligent Transport System. In this paper, we proposed and implemented a short-term traffic information prediction model for giving to guarantee the traffic information with high quality in the near future. A Short-term prediction model is for forecasting traffic flows of each segment in the near future. Our prediction model gives an average speed on the each segment from 5 minutes later to 60 minutes later. We designed a Bayesian network for each segment with some casual nodes which makes an impact to the road situation in the future and found out its joint probability density function on the supposition of GMM(Gaussian Mixture Model) using EM(Expectation Maximization) algorithm with training real-time traffic data. To validate the precision of our prediction model we had conducted various experiments with real-time traffic data and computed RMSE(Root Mean Square Error) between a real speed and its prediction speed. As the result, our model gave 4.5, 4.8, 5.2 as an average value of RMSE about 10, 30, 60 minutes later, respectively.
To measure the serum succinyl trialanine p-nitroanilide hydrolytic activity as new index of liver function in workers exposed to organic solvents, this study conducted 114 workers in department of shoe-making of shoes factories. The results obtained from this study were as follows : 1. The mean values of serum GOT, GPT, ${\gamma}GT$ in whole workers were $22{\pm}12.32,\;20{\pm}9.05,\;28{\pm}21.35IU/l$, respectively and the mean value of serum STN hydrolytic activity was $0.08{\pm}0.05$. 2. The serum STN hydrolytic activity was significantly higher for male (p<0.05) and there was no difference among the groups of age. 3. There was no difference in the groups by working hours but significant difference in persons who worked over 3 years or were exposed to toluene over 100ppm (p<0.05). 4. The correlation of the exposed dose of toluene and serum GOT, GPT, ${\gamma}GT$ and serum STN hydrolytic activity were statistically significant (r=0.027-0.518). 5. The exposed dose of toluene was most explainable variable and statistically significant among the factors affecting serum STN hydrolytic activity (p<0.05).
Journal of the Korean Society of Fisheries and Ocean Technology
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v.39
no.2
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pp.120-127
/
2003
In Korea, Trachysalambria curvirostris occurs widely along the south and west coasts with a range extending from Kanghwado in the northwest down to Sarangdo in the southeast. Sex ratio showed seasonal variations, with a mean value of 48.6% for the females. T. curvirostris produces one cohort a year, with the ovaries ripening from July to August. Insemination appeared to take place from June to August, as more than half of the females sampled in the study of over 19 mm carapace length were inseminated. The mean gonado somatic index (GSI) reached a maximum between July and August. The smallest mature female found was a 18 mm carapace length (CL). Size at 50% sexual maturity (CL$_(50)$), determined from both mature females and inseminated females was 18.89 mm and 19.91 mm CL, respectively. The life span of females appeared to be 14-15 months according to size frequency distributions, while that of the male was 13-14 months. Population growth was estimated by the modified von Bertalanffy growth function incorporating seasonal variation in growth. Based on the growth parameters (K = 1.40 yr$_(-1)$ and L$L\infty$ = 29.54 mm CL for females, and K = 2.00yr$_(-1)$ and L$L\infty$ = 18.95 mm CL for males) growth curves showed that females grew faster and reached a larger size than males.
Tin-doped indium oxide (ITO) thin films were deposited using r.f. magnetron reactive sputtering and the electrical properties, such as the resistivity, carrier concentration and mobility, were investigated as a function of the sample position under a given magnetron sputtering condition. The nonhomogeneity of the electrical properties with the sample position was observed under a given magnetron sputtering condition. The resistivity of ITO thin film on the substrate which corresponded to the center of the target had a minimum value, 2∼4$\times$10$\^$-4/$\Omega$$.$cm, and it increased symmetrically when the substrate deviated from the center. The density measurement result also showed that ITO thin film deposited at the center has a maximum density of 7.0g/cm$^3$, which was a relative density of about 97%, and the density decreased symmetrically as the substrate deviated from the center. The nonhomogeneity of electrical properties with the deposition position could be explained with the incidence angle of the source beam alpha, which is related with an atomic self-shadowing effect. It was confirmed experimentally that the density in film affect both the carrier mobility and the conductivity. In the case where the density of ITO thin film is 7.0g/cm$^3$, the magnitude of the mean free path was identical with that of the grain size(the diameter of column). However, in the other cases, the mean free path was smaller than the grain size. These results showed that the scattering of the free electrons at the grain boundary is the major factor for the electrical conduction in ITO thin films having a high density, and there exists other scattering sources such as vacancies, holes, or pores in ITO thin films having a low density.ing a low density.
Journal of Dental Rehabilitation and Applied Science
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v.19
no.3
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pp.169-183
/
2003
According to our recent investigation that the increase in the occlusal vertical dimension made the appendage muscle strength got higher, the occlusal appliances were made by increasing the occlusal vertical dimension "from the centric relation" position of the mandible. In this experiment, the authors tried to study the change in the appendage muscle strength due to increase in occlusal vertical dimension from intercuspal position(ICP) of mandible with the same subjects and manner as the former experiment. For this study, ten male athletes in a mean age of 23 year who were joined the former study were selected. All the subjects had a complete or almost complete set of natural teeth and reported no subjective symptoms of temporomandibular disorders. Upper and lower casts were mounted on the semi-adjustable articulator at the intercuspal position and a point was marked on the attached gingival area between the right canine and the right 1st. premolar in each upper and lower cast. From the points, the occlusal vertical dimension was increased by 2mm, 3.5mm and 5mm, and then each 10 maxillary type occlusal splint at each 3-increased position were fabricated with heat curing clear acrylic resin. Including the intercuspal position, the 3 kinds of occlusal splints were placed on the subjects individually, and then isokinetic muscle strength on 7 parts of the human appendage which are shoulder, knee, ankle, wrist, forearm, elbow and hip was measured with the CYBEX 6000 SYSTEM (Lumex, NewYork, USA). The results were as follows: The highest mean value in muscular strength was shown at the position of 2mm-increased vertical dimension. The muscle strength during internal/external rotation of shoulder and knee, plantarflexion of ankle, flexion of elbow, and flexion and extension of hip at the increased occlusal vertical dimension position were significantly higher than them at the intercuspal position (p<0.05). Only in view of the increase in the appendage muscle strength, regardless of the way of making the occlusal splints by elevating the occlusal vertical dimension from the centric relation position or intercuspal position, the occlusal splints had an effect on the increase of isokinetic muscle strength at the occlusal vertical dimension which increased within the proper range on the habitual arc of closure.
Park, Chul Soo;Hwang, Seon Keun;Choi, Chan Yong;Mok, Young Jin
KSCE Journal of Civil and Environmental Engineering Research
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v.29
no.2C
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pp.71-79
/
2009
This study is to develope the resilient modulus prediction model, which is the function of mean effective principal stress and axial strain, for three types of railroad trackbed materials such as crushed stone, weathered granite soil, and crushed-rock soil mixture. The model consists of the maximum Young's modulus and nonlinear values for higher strain, analogous to dynamic shear modulus. The maximum value is modeled by model parameters, $A_E$ and the power of mean effective principal stress, $n_E$. The nonlinear portion is represented by modified hyperbolic model, with the model parameters of reference strain, ${\varepsilon}_r$ and curvature coefficient, a. To assess the performance of the prediction models proposed herein, the elastic response of a test trackbed near PyeongTaek, Korea, was evaluated using a 3-D elastic multilayer computer program (GEOTRACK). The results were compared with measured elastic vertical displacement during the passages of freight and passenger trains at two locations, whose sub-ballasts were crushed stone and weathered granite soil, respectively. The calculated vertical displacements of the sub-ballasts are within the order of 0.6mm, and agree well with measured values. The prediction models are thus concluded to work properly in the preliminary investigation.
Journal of Physiology & Pathology in Korean Medicine
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v.22
no.6
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pp.1626-1632
/
2008
Among patients who are receiving treatments at an oriental medical hospital for various symptoms and diseases, patients whose main disease is accompanied by metabolic syndrome with abnormal liver function. This research was performed in order to observe the progression of changes in the liver function and serum lipid profile after the oriental medical treatments to patients who have been receiving oriental medical treatment for various other diseases and have been diagnosed as having metabolic syndrome at their first visit to the hospital based on NCEP ATP III diagnosis criteria and WHO Asia Pacific region criteria. Total number of subject patients were 39cases(mean age:55.58${\pm}$2.09 years) which had 20 male and 19 female. For the references for hepatic enzyme levels and blood lipid profile were measured in before treatment and four times after treatments(every 2.31${\pm}$06.17 weeks). Serum AST was 48.86${\pm}$7.46 IU/L before oriental medical treatment. After the treatment, 40.63${\pm}$4.69, 43.12${\pm}$5.46, 37.82${\pm}$4.52 IU/L were measured where although the level decreased to the normal level compared to pre-treatment, the value was not significant statistically(P>0.05). ALT was 66.26${\pm}$11.01 IU/L before oriental medical treatment. After the treatment 62.10${\pm}$8.20, 61.10${\pm}$8.76, 43.79${\pm}$5.68 were measured where although the level decreased, abnormally high level was maintained. The last result was significant statistically(P<0.05) compared to pre-treatment. ALP was 193.06${\pm}$14.20 IU/L before oriental medical treatment. After the treatment, 176.80${\pm}$6.48, 177.46${\pm}$11.81, 162.41${\pm}$9.06 where although compared to pre-treatment the last result was significant statistically(P<0.05), the change was within the normal range. ${\gamma}$-GGT was 87.83${\pm}$12.59 IU/L before oriental medical treatment. After the treatment, progressively near normal level was achieved with 118.73${\pm}$46.45, 85.03${\pm}$17.12, 70.64${\pm}$10.93 and the last result was statistically significant compared to pre-treatment (P<0.05). Blood triglyceride was 217.63${\pm}$32.18 mg/dL before oriental medical treatment. After treatment 215.09${\pm}$22.18, 189.93${\pm}$22.44, 191.22${\pm}$18.51 where abnormal values continued even after treatment although results was not statistically significant compared to pre-treatment(P>0.05). Total-cholesterol was 197.28${\pm}$9.24 mg/dL before oriental medical treatment, after treatment 201.55${\pm}$11.13, 186.87${\pm}$8.77 and 186.68${\pm}$7.61 were measured that results were not statistically significant compared to pre-treatment(P>0.05). HDL-cholesterol was 41.88${\pm}$2.38 mg/dL before oriental medical treatment, after treatment 48.75${\pm}$4.22, 44.10${\pm}$1.91, 48.00${\pm}$2.06 the results were not statistically significant compared to pre-treatment(P>0.05). LDL-cholesterol was 111.66${\pm}$13.08 mg/dL before oriental medical treatment, after treatment 109.94${\pm}$10.18, 101.79${\pm}$8.63, 104.00${\pm}$6.98 the results were not statistically significant compared to pre-treatment(P>0.05). With such results, even if common oriental medical treatments were given to metabolic syndrome patients with abnormal liver function, the liver function was confirmed not to be aggravated, and the concentration of lipids in the blood was confirmed not to be affected in most patients.
Background: To evaluate the risk factor and long-term result of arterial switch operation , a retrospective study was done. Material and Method: A retrospective analysis was done to evaluate the early and long-term results on 58 patients who underwent an arterial switch operation(ASO) for transposition of the great arteries(TGA) with intact ventricular septum, between January 1988 and December 1996. Beforesurgery, 36 patients(62.1%) underwent balloon atrial septostomy, 32 patients(51.7%) received PGE1 infusion, and preparatory banding of pulmonary artery was performed on 6 patients(mean LV/RV pressure ratio 0.53$\pm$0.11). Result: The age at operation ranged from 1 to 137 days(mean 24$\pm$26 days) and the weights ranged from 1.8 to 6.8 kg (mean 3.5$\pm$0.8 kg). There were 14 early deaths(24.1%), but of the last 24 patients operated on since 1994, there were only 2 early deaths(8.3%). In the risk factor analysis, the date of operation was the only risk factor for early death(p-value < 0.01). Eight of the 14 early deaths were due to acute myocardial failure(mainly inadequate coronary blood flow). The length of follow-up ranged from 2 months to 8 years, average of 36$\pm$27 months. The follow-up included sequential noninvasive evaluations and 21 catheterizations and angiographic studies performed 5 to 32 months postoperatively with particular attention to the great vessel and coronary anastomosis, ventricular function, valvular competence, and cardiac rhythm. There were 5 late deaths(11.4%), one of thesedeaths was related to the late coronary problems, two to aspiration, one to uncontrolled chronic mediastinitis, and one to progressive aortic insufficiency and heart failure. The most frequent postoperative hemodynamic abnormality was supravalvular stenosis and the degree of pulmonary or aortic obstruction had slowly progressed in some cases, however there were no children who had to undergo a reoperation for supravalvular pulmonary or aortic stenosis. Aortic regurgitation was identified in 9 patients, which was mild in 7 and moderate in 2 and had progressed in some cases. Two patients who had an unremarkable perioperative course were identified as having coronary artery obstructions. The other late survivors were in good condition, were in sinus rhythm, and had normal LV functions. Actuarial survival rate at 8 years was 68.8%. Conclusion: We concluded that anatomic correction will be established as the optimal approach to the TGA with intact ventricular septum, though further long-term evaluations are needed.
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