Kim, Byeong-Hak;Park, Min-Woo;Son, Maeng-Hyun;Kim, Tae-Ik;Lee, Si-Woo
The Korean Journal of Malacology
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v.30
no.3
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pp.219-226
/
2014
The effects of different stocking densities on the growth and survival rate of the abalone, Haliotis discus hannai, were investigated in marine net cage for two years. Stocking density was set 15, 30, 45 and 60 percentage $(=per.)/m^2$ with share to cross-sectional area per shelter. The primary rearing period (PRP) and the secondary rearing period (SRP) were conducted by a year. One year mean water temperature of PRP and SRS showed the difference about $2^{\circ}C$. In the growth (initial mean shell length of abalone : $36.14{\pm}2.28mm$) of PRP, the absolute growth rate (ARG), daily growth rate (DGR) and specific growth rate (SGR) of the $15per./m^2$ were higher than those of density groups (P < 0.05). Survival rates of all density groups were showed no significant difference. In the growth (mean shell length of abalone : $55.26{\pm}6.93mm$) of SRP, ARG, DGR and SGR of stocking density groups showed no significant difference except for $45per./m^2$ density group. Survival rate in the low-density (15, $30per./m^2$) was more than 70%, and those of the high-density (45, $60per./m^2$) were less than 31% and 9%, respectively. These results showed that the appropriate stocking density for $15per./m^2$ was seven hundred fifty number per one net cage ($2.4{\times}2.4m$), during PRP using 3-4 cm abalone in length. Also for the secondary rearing period, the optimal stocking density (shell length 5-6 cm of abalone) consider with the economical efficiency was determined to be $30per./m^2$, resulting the productivity improved.
Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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2010.06a
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pp.31-31
/
2010
The growth of the high-quality GaN epilayers is of significant technological importance because of their commercializedoptoelectronic applications as high-brightness light-emitting diodes (LEDs) and laser diodes (LDs) in the visible and ultraviolet spectral range. The GaN-based heterostructural epilayers have the polar c-axis of the hexagonal structure perpendicular to the interfaces of the active layers. The Ga and N atoms in the c-GaN are alternatively stacked along the polar [0001] crystallographic direction, which leads to spontaneous polarization. In addition, in the InGaN/GaN MQWs, the stress applied along the same axis contributes topiezoelectric polarization, and thus the total polarization is determined as the sum of spontaneous and piezoelectric polarizations. The total polarization in the c-GaN heterolayers, which can generate internal fields and spatial separation of the electron and hole wave functions and consequently a decrease of efficiency and peak shift. One of the possible solutions to eliminate these undesirable effects is to grow GaN-based epilayers in nonpolar orientations. The polarization effects in the GaN are eliminated by growing the films along the nonpolar [$11\bar{2}0$] ($\alpha$-GaN) or [$1\bar{1}00$] (m-GaN) orientation. Although the use of the nonpolar epilayers in wurtzite structure clearly removes the polarization matters, however, it induces another problem related to the formation of a high density of planar defects. The large lattice mismatch between sapphiresubstrates and GaN layers leads to a high density of defects (dislocations and stacking faults). The dominant defects observed in the GaN epilayers with wurtzite structure are one-dimensional (1D) dislocations and two-dimensional (2D) stacking faults. In particular, the 1D threading dislocations in the c-GaN are generated from the film/substrate interface due to their large lattice and thermal coefficient mismatch. However, because the c-GaN epilayers were grown along the normal direction to the basal slip planes, the generation of basal stacking faults (BSFs) is localized on the c-plane and the generated BSFs did not propagate into the surface during the growth. Thus, the primary defects in the c-GaN epilayers are 1D threading dislocations. Occasionally, the particular planar defects such as prismatic stacking faults (PSFs) and inversion domain boundaries are observed. However, since the basal slip planes in the $\alpha$-GaN are parallel to the growth direction unlike c-GaN, the BSFs with lower formation energy can be easily formed along the growth direction, where the BSFs propagate straightly into the surface. Consequently, the lattice mismatch between film and substrate in $\alpha$-GaN epilayers is mainly relaxed through the formation of BSFs. These 2D planar defects are placed along only one direction in the cross-sectional view. Thus, the nonpolar $\alpha$-GaN films have different atomic arrangements along the two orthogonal directions ($[0001]_{GaN}$ and $[\bar{1}100]_{GaN}$ axes) on the $\alpha$-plane, which are expected to induce anisotropic biaxial strain. In this study, the anisotropic strain relaxation behaviors in the nonpolar $\alpha$-GaN epilayers grown on ($1\bar{1}02$) r-plane sapphire substrates by metalorganic chemical vapor deposition (MOCVO) were investigated, and the formation mechanism of the abnormal zigzag shape PSFs was discussed using high-resolution transmission electron microscope (HRTEM).
Micro-computed tomography (microCT) is an important tool for preclinical vascular imaging, with micron-level resolution. This non-destructive means of imaging allows for rapid collection of 2D and 3D reconstructions to visualize specimens prior to destructive analysis such as pathological analysis. Objectives. The aim of this study was to suggest a method for ex vivo, postmortem examination of stented arterial segments with microCT. And ex vivo evaluation of stents such as bare metal or drug eluting stents on in-stent restenosis (ISR) in rabbit model was performed. The bare metal stent (BMS) and drug eluting stent (DES, paclitaxel) were implanted in the left or right iliac arteries alternatively in eight New Zealand white rabbits. After 4 weeks of post-implantation, the part of iliac arteries surrounding the stent were removed carefully and processed for microCT. Prior to microCT analysis, a contrast medium was loaded to lumen of stents. All samples were subjected to an X-ray source operating at 50 kV and 200 ${\mu}A$ by using a 3D isotropic resolution. The region of interest was traced and measured by CTAN analytical software. Objects being exposed to radiation had different Hounsfield unit each other with values of approximately 1.2 at stent area, 0.12 ~ 0.17 at a contrast medium and 0 ~ 0.06 at outer area of stent. Based on above, further analyses were performed. As a result, the difference of lengths and volumes between expanded stents, which may relate to injury score in pathological analysis, was not different significantly. Moreover, ISR area of BMS was 1.6 times higher than that of DES, indicating that paclitaxel has inhibitory effect on cell proliferation and prevent infiltration of restenosis into lumen of stent. And ISR area of BMS was higher ($1.52{\pm}0.48mm^2$) than that of DES ($0.94{\pm}0.42mm^2$), indicating that paclitaxel has inhibitory effect on cell proliferation and prevent infiltration of restenosis into lumen of stent. Though it was not statistically significant, it showed that the extent of neointema of mid-region of stents was relatively higher than that of anterior and posterior region in parts of BMS as showing cross-sectional 2-D image. suggest that microCT can be utilized as an accessorial tool for pathological analysis.
Lee, Won-Jeong;Lim, Dong-Hwan;Park, Jeong-Soon;Sim, Yeung-Eun;Jeong, Yoo-Jin;Kim, Jeong Ho;Yoo, Se Jong
Journal of the Korean Society of Radiology
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v.14
no.3
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pp.271-277
/
2020
The Purpose of this study was to examine the survival rate and weight of rhinoceros beetle larvae by irradiating X-rays which are most commonly used in diagnosing and treating for diseases. Subjectts and Methods: In early April 2019, the rhinoceros beetle larvae 41 were classified into two groups as control group (11 larvae) and irradiated group (10 Gy, 20 Gy, 30 Gy, each 10 larvae). The irradiated group was exposed by 6 MV X-ray using linear accelerators (Clinac IS, VERIAN, USA) at the University Hospital in Daejeon (Source-surface distance 96 cm, field size 18 × 10 cm, dose rate 600 MU/min), after environmental adaptation for 3 days (temperature 20.6℃, humidity 64.3%). The survival rate and weight were measured weekly after irradiating X-ray. All statistical analyses were performed using the SPSS ver. 22.0 (Chicago, IL, USA). The weight was analysed by Independent T-test, by cross-sectional analysis for survival rates between control and X-ray irradiated groups. Also, the correlation between dose and weight was analyzed by Spearman test. In 3-week after irradiating X-ray, weight was significant difference between control group and irradiated group (10 Gy or 20 Gy, p < 0.05; and 30 Gy, p < 0.01) with increasing weight in all experimental groups. In 14-week, weight was increased in the control group, but decreased in irradiated group. weight was significant difference between control group and irradiated group. The survival rate in 3-week was decreased rapidly in all experimental group except 10 Gy, to 4-week in irradiated group. The control group had no change in survival rate 54.5% from 3-week to 14-week. From the 3-week, it showed lower survival rate with increasing radiation dose in irradiated group. In 19-week, survival rate of control group and 10 Gy was 45.4% and 30.0% respectively, all died in 20 Gy and 30 Gy. Weight was significantly negative correlated with radiation dose as longer time after irradiating X-ray. The weight and survival rate of rhino beetle larvae is affected by irradiating X-rays, weight and survival rate decreased more in higher dose.
Kim, Jang-Rak;Nam, Bock-Dong;Kim, Ju-Ho;Lee, Song-Kwon;Moon, Joong-Kap;Lee, Jang-Ho;Hong, Dae-Yong
Journal of Preventive Medicine and Public Health
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v.29
no.2
s.53
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pp.173-186
/
1996
This is a cross-sectional study to evaluate the relationships between physical fitness, leisure time physical activity, and serum lipid levels in middle-aged male workers. Physical fitness was measured by a step test score, and leisure time physical activity was self-reported on a questionnaire. Serum total cholesterol was negatively related to physical fitness(r=-0.27), and positively to obesity index(r=0.27). But leisure time physical activity was related to total cholesterol negatively(r=-0.20) only in subjects whose total cholesterol levels were above 170mg/dl. High density lipoprotein(HDL) cholesterol was positively related to physical fitness(r=0.15), negatively to obestiy index(r=-0.22), and positively to weekly alcohol consumption(r=0.14). Total cholesterol/HDL cholesterol ratio was related to physical fitness(r=-0.23), obesity index(r=0.32), total cigarette index (r=0.13), weekly alcohol consumption(r=-0.13), and vegetable preference(r=0.13). Physical fitness was also related to leisure time physical activity(r=0.19) and obesity index(r=-0.18). In multiple linear regression models, physical fitness(beta=-0.23) and obesity index(beta=0.18) were significantly associated with total cholesterol, obesity index(beta=-0.25) with HDLcholesterol, and obesity index(beta=0.30), physical fitness(beta=-0.16) and vegetable preference (beta=0.14) with total cholesterol/HDL cholesterol ratio. In conclusion, as physical fitness has a stronger relationship with serum lipid levels than leisure time physical activity, and the association between physical fitness and leisure time physical activity is modest, physical fitness should be added as an important variable in addition to activity in future epidemiologic studies.
Twenty six strains of lactic acid bacteria were isolated from Jeung-pyun batter, among which Tetragenococcus halophilus 1-12 showed highest dextransucrase activity at 36.95 DSU/mg, followed by T. halophilus 5-8 (36.87 DSU/mg protein), T. halophilus 2-12 (32.66 DSU/mg protein), T. halophilus 3-3 (31.43 DSU/mg protein), T. halophilus 3-1 (30.73 DSU/mg protein), T. halophilus 5-12 (29.43 DSU/mg protein), and Leuconostoc mesenteroides subsp mesenteroides 2-9 (28.5 DSU/mg protein). L. mesenteroides subsp mesenteroides 2-9, T. halophilus 1-12, and L. mesenteroides subsp dextranicum 5-13, were selected as starters (0.1, 0.5, and 1.0%) for Jeung-pyun manufacturing. Specific volume of Jeung-pyun added with 1.0% L. mesenteroides subsp dextranicum 5-13 was highest at 2.00, and 1.0% T. halophilus 1-12-added Jeung-pyun was lowest at 033. Cross-sectional observation of Jeung-pyun showed Jeung-pyun added with 0.5% L. mesenteroides subsp mesenteroides 2-9 was uniformly formed. Number of air holes of Jeung-pyun increased with increasing amount of added T. halophilus 1-12. Increasing addition of L. mesenteroides subsp dextranicum 5-13 resulted in more uniform air holes and volumes. Hardness, gumminess, and chewiness of Jeung-pyun added with 0.5 and 2.0% L. mesenteroides subsp dextranicum 5-13 decreased significantly in compasion to control groups. Jeung-pyun added with 0.5% L. mesenteroides subsp dextranicum 5-13 showed excelIent overall sensory desirability ranking of 8.500.
Journal of the Microelectronics and Packaging Society
/
v.10
no.3
/
pp.19-27
/
2003
Surface finishes of PCB laminates are important in the solder joint reliability of flip chip package because the types and thicknesses of intermetallic compound(IMC), and compositions and hardness of solders are affected by them. In this study, effects of surface finishes of PCB on the low cycle fatigue resistance of Sn-based lead-free solders; Sn-3.5Ag, Sn-3.5Ag-XCu(X=0.75, 1.5), Sn-3.5Ag-XBi(X=2.5, 7.5) and Sn-0.7Cu were investigated for the Cu and Au/Ni surface finish treatments. Displacement controlled room temperature lap shear fatigue tests showed that fatigue resistance of Sn-3.5Ag-XCu(X=0.75, 1.5), Sn-3.5Ag and Sn-0.7Cu alloys were more or less the same each other but much better than that of Bi containing alloys regardless of the surface finish layer used. In general, solder joints on the Au/Ni finish showed better fatigue resistance than those on the Cu finish. Cross-sectional fractography revealed microcracks nucleation inside of the interfacial IMC near the solder mask edge, more frequently on the Cu than the Au/Ni surface finish. Macro cracks followed the solder/IMC interface in the Bi containing alloys, while they propagated in the solder matrix in other alloys. It was ascribed to the Bi segregation at the solder/IMC interface and the solid solution hardening effect of Bi in the $\beta-Sn$ matrix.
The location and geometry of the Ulsan Fault play important roles in interpreting tectonic evolution of the southeastern part of the Korean Peninsula. Dipole-dipole electrical resistivity surveys and seismic refraction surveys were carried out in the Yaksoo area, Ulsan in order to measure the thickness of the alluvium covering the Ulsan Fault and to find associated fracture zones and possibly the location of its major fault plane. The collected data were analyzed and interpreted. Some results reported previously by others were also used in this interpretation. No low resistivity anomalies were found in the cross-sectional resistivity image of the survey line located in the east of the Dong River. In contrast, well-developed continuous low resistivity anomalies were detected in the west of the Dong River. This strongly suggests that the major fault plane of the Ulsan Fault is located under or in the west part of the Dong River. Two refraction boundaries corresponding to the underground water level and the bottom of the alluvium were found by refraction surveys carried out on the limited part of the east survey line. The thickness of the alluvium was found to be about 30 m. Small faults in the basement rock identified by reflection surveys were not detected by both resistivity and refraction seismic surveys. This might be explained by assuming that low resistivity anomaly is more closely related to the clay contents than the water contents. On the other hand, it may be resulted by the limited resolution of the resistivity and refraction surveys. Detailed study is required to clarify the reason. Resistivity survey is frequently considered to be a good exploration method to detect subsurface faults. However, it appears to be less useful than reflection seismic survey in this work. In dipole-dipole resistivity survey, the number of separation should be increased to survey deeper subsurface with the same resolution. However, signal to noise ratio decreases as the number of separation increases. In this survey area, the signal to noise ratio of up to sixteen separations was good enough based on the statistical properties of measurements.
Kang, Myung Hee;Moon, Young Sil;Lee, Young Joon;Kang, Yoon Sik;Kim, Hoon Gu;Lee, Gyeong Won;Lee, Won Sup;Kang, Jung Hun
Journal of Hospice and Palliative Care
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v.17
no.4
/
pp.216-222
/
2014
Purpose: This study was performed to identify the symptoms and care needs of home-based cancer patients in Korea and to add to the scarce literature on this topic. Methods: Data were collected from patients who subscribed to home-based cancer care services in Jinju. Assessments were performed by nurses at the local public health center. The Edmonton Symptom Assessment System with a numeric rating scale (NRS) was used to identify symptoms, and a four-point Likert scale was used to assess psychological, social, and spiritual needs. Results: Cross-sectional data were collected in October 2013. A total of 209 patients participated and their median age was 65 years (range, 17~89 years). Most patients were diagnosed in the early stage of cancer (n=188); only 19 patients were diagnosed in the advanced stage. More than half the patients lived alone (n=115, 55.0%) and took care of themselves (n=128, 61.2%). Anorexia and fatigue were the most common symptoms (median NRS, 5 and 4, respectively). Patients needed economic support the most, whereas spiritual care was least needed (n=138 [67.3%] vs. n=128 [62.1%], respectively). Conclusion: Patients who signed up for home-based cancer care services in Jinju are struggling with a financial issue and physical symptoms. A customized approach is needed to improve the quality of the home-based care services.
Journal of agricultural medicine and community health
/
v.41
no.4
/
pp.205-216
/
2016
Objectives: We compared the difference of lipid, insulin resistance and metabolic markers based on HCV RNA in Korean adults.Methods: This was a cross-sectional study of 222 subjects visited the health promotion center of Pusan nationaluniversity hospital from 2004 to 2007. Subjects were anti-HCV antibody positive and were performed RT-PCR for HCV RNA. The HCV RNA (+) group were 85 subjects, HCV RNA (-) control group were 115 subjects, and the HCV RNA (-) but past positive group were 22 subjects. We performed anthropometry, anti-HCV, RT-PCR, plasma concentrations of insulin, total cholesterol, LDL-cholesterol, HDL-cholesterol, and triglyceride.Results: BMI, waist circumference, blood pressure, fasting plasma glucose, triglyceride, HDL cholesterol, insulin resistance such as HOMA-IR and QUICKI were not significantly different between HCV RNA positive and negative groups. The serum total cholesterol and LDL cholesterol level were significantly lower in the HCV RNA positive group than in the negative group ($186.24{\pm}37.63$ vs $197.22{\pm}37.23$ mg/dl, p=0.041, $111.66{\pm}34.06$ vs $121.38{\pm}35.50$ mg/dl, p=0.042). After adjusting age and sex, high total cholesterol (${\geq}200mg/dl$) (adjusted OR=0.51, 95%CI 0.28-0.94, p=0.03) and high LDL cholesterol (${\geq}130mg/dl$) (adjusted OR=0.46, 95%CI 0.24~0.87, p=0.02) were inversely associated with being HCV RNA positive (p<0.05). Conclusion: The serum total cholesterol and LDL-cholesterol level were significantly lower in HCV RNA (+) group than in HCV RNA (-) group, but not in HCV RNA (-) but past positive group. Prospective cohort studies are needed to clarify the relationship between HCV RNA and metabolic markers.
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