• Korean Journal of Soil Science and Fertilizer
• /
• v.7 no.4
• /
• pp.209-213
• /
• 1974

The isozymes of glutamic oxalacetic transaminase from young rice root were isolated by DEAE-cellulose column chromatography, and investigated some of their enzymic properties. Obtained results were summarized as follows: 1. 93 percent of GOT activity in rice root existed in supernatant fraction, and their specific activity exibited the same pattern. 2. The rice root contained two types of GOT isozyme; cationic and anionic GOT. It seemed that both of them were distributed in supernatant fraction. 3. GOT isozymes of rice root on the pH dependance showed their maximum activity at 7.4. 4. On the stability of GOT isozymes for temperature, anionic GOT was more unstable than cationic GOT. 5. Apparent Michaelis constant for L-aspartate of GOT isozymes from rice root showed 12-14mM in the cationic GOT and 16mM in the anionic GOT, respectively.

• The Korean Journal of Health Service Management
• /
• v.6 no.1
• /
• pp.15-25
• /
• 2012

The purpose of this study is to examine relations among the subjective oral symptoms, masticatory performance and life quality of aged people residing in some regions of a large city, ultimately providing basic information needed to develop and implement programs oral health project and oral health education programs for the oral health promotion of those people. For the above purpose, this researcher conducted a questionnaire survey of people aged 65 or over from July 14th to 30th, 2011. Among the copies of the questionnaire distributed to the subjects, 318 were recollected. Out the recollected forms, 18 which were deemed as in appropriately filled in were excluded, and the remaining 300 were finally analyzed. The results are as follows. Subjective oral symptoms and masticatory performance have correlation(p<0.001) with aged people's life quality. Factors of influencing life quality were indicated to be gender(p=0.046), age(p=0.008), appearance of living together(<0.001), masticatory performance(p<0.001), and temperature reaction(p=0.018). This study has limitation because of being information that was obtained just with questionnaire survey on subjective oral symptoms. It is considered that there is a need of surveying along with objective data on oral symptoms hereafter.

• Journal of Korean Society for Atmospheric Environment
• /
• v.21 no.E1
• /
• pp.23-35
• /
• 2005

Size distribution of particulate water-soluble ion components was measured at Gosan, Korea using a micro-orifice uniform deposit impactor (MOUDI). Sulfate, ammonium, and nitrate showed peaks in three size ranges; Sulfate and ammonium were of dominant species measured in the fine mode ($D_{p} < 1.8 {\mu}m$). One peak was observed in the condensation mode ($0.218\sim0.532{\mu}m$), and the other peak was obtained in the droplet mode ($0.532\sim1.8{\mu}m$). Considering the fact that the equivalent ratios of ammonium to sulfate ranged from 0.5 to 1.0 in these size ranges, it is inferred that they formed sufficiently neutralized compounds such as ($NH_{4})_{2}SO_{4} and (NH_{4})_{3}H(SO_{4})_{2}$ during the long-range transport of anthropogenic pollutants. On the other hand, nitrate was distributed mainly in the coarse mode ($3.1\sim6.2{\mu}m$) combined with soil and sea salt. Two sets of MOUDI samples were collected in each season. One sample was collected when the concentrations of criteria air pollutants were relatively high, but the other represented relatively clean air quality. The concentrations of sulfate and ammonium particles in droplet mode were the highest in winter and the lowest in summer. When the air quality was bad, the increase of nitrate was observed in the condensation mode ($0.218\sim0.282{\mu}m$). It thus suggests that the nitrate particles were produced through gas phase reaction of nitric acid with ammonia. Chloride depletion was remarkably high in summer due to the high temperature and relative humidity.

• Advances in nano research
• /
• v.6 no.3
• /
• pp.243-255
• /
• 2018

Polystyrene granules were combined with nanosilver to form a nanocomposite film. One-side migration was conducted to test into three food simulants (3% acetic acid, 10% ethanol and 95% ethanol) at $40^{\circ}C$ temperature on different period of time (2, 4, 6, 8 and 10 days). It was found that, among the simulants, the highest migration amount was obtained with 3% acetic acid, while the 95% ethanol revealed the least migration level. Diffusion coefficients of nanosilver particles into simulants were estimated by inverse simulation using experimental data of concentration variation in the simulants. The finite element method used to solve the mass transfer equation and the numerical results indicates the sameresponse with the experimental data. The numerical results confirmed that the highest diffusion coefficient for acetic acid 3% (1.82E-10 to $1.76E-9m^2\;s^{-1}$) and the lowest diffusion coefficient for ethanol 95% from 2 to 10 days were obtained, respectively. Also, results of diffusion coefficient - concentration relation showed, the diffusion coefficient had in direct correlation with time and concentration. The results indicated that, in the 3% acetic acid, due to the increasing of diffusion coefficient of silver nanoparticles, they are released faster and distributed uniformly.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.16 no.4
• /
• pp.395-400
• /
• 1983

Rock trout, Agrammus agrammus(Temminck et Schlegel) is commonly found at the coast of Korean waters. Mature adult of the rock trout were collected at the shore of Dongbaeksom in Pusan during the period from Nov. 18 to Nov. 25, 1983 through know the early developmental characters. The authors carried out the artificial insemination in the laboratory on Nov. 24, 1982, and roared the eggs and the hatched larvae. The eggs of this species are demersal and adhesive, and their diameter were varied within 1.92-2.14mm. The color of yolk is light blue in the early developmental stage, and then turned to orange before hatching out. The yolk contained numerous tiny oil globules. Hatchig toot plnace in ca. 463 hours after insemination at $11.8-17.9^{\circ}C$ of water temperature. The newly hatched larvae were elongate in share and 6.55-8.20 mm in total length with 12+26=48 myomers. Many branched melanophores were distributed on the supra-orbital, dorsal double body contour, and peritoneal, and also under the notochord of the tail.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2011.11a
• /
• pp.949-952
• /
• 2011

Study on differential pressure in the chamber of cannon by adjusting the mass flow of ignition-gas has been conducted using the 1-D interior ballistics numerical code called IBcode. In case of large-caliber cannon, high temperature ignition-gas is injected to the chamber through the side hole of the primer to ignite the propellant. Therefore, mass flow of injected ignition-gas affects the propellant combustion in the chamber. Mass flow of each side hole of the current primer was uniformly distributed. In this study, differences of propellant combustion with different mass flow of each side hole have been imposed. Results in case of the mass flow increase in the direction to the base show that the differential pressure decreases compared to the uniformed mass flow.

• The Korean Journal of Malacology
• /
• v.26 no.1
• /
• pp.97-105
• /
• 2010

Annual gonad development of the rock shell, Thais clavigera distributed in Jeju Port was investigated over a 12 month period from March 1998 to February 1999. Monthly change in gonad development was examined using histology. Gametogenesis of T. clavigera in the study area initiated as early as in October and fully ripe eggs could be observed from May to July. Percent gonad area (PGA) also increased rapidly from May to July then dropped in August when the water temperature remained $22.6-24.5^{\circ}C$, suggesting that rock shell released their eggs during this period. All female rock shell collected during the course of study exhibited pseudo-penis in the head, indicating that a certain level of imposex had progressed in the study site. Relative penis size index (RPSI), an indicator of level of imposex phenomenon varied 59.5-173.4% and this value was relatively higher than the index reported from elsewhere. It was believed that such imposex phenomenon observed in T. clavigera was caused by endocrine disruption by chemical contaminants such as TBTs released from biocidal paints in the port environment.

• Structural Engineering and Mechanics
• /
• v.62 no.6
• /
• pp.749-758
• /
• 2017

In structural mechanics, traditional analyses methods usually employ matrix operations for obtaining displacement and internal forces of the structure under the external effects, such as distributed loads, earthquake or wind excitations, and temperature changing inter alia. These matrices are derived from the well-known principle of mechanics called minimum potential energy. According to this principle, a system can be in the equilibrium state only in case when the total potential energy of system is minimum. A close examination of the expression of the well-known equilibrium condition for linear problems, $P=K{\Delta}$, where P is the load vector, K is the stiffness matrix and ${\Delta}$ is the displacement vector, it is seen that, basically this principle searches the displacement set (or deformed shape) for a system that minimizes the total potential energy of it. Instead of using mathematical operations used in the conventional methods, with a different formulation, meta-heuristic algorithms can also be used for solving this minimization problem by defining total potential energy as objective function and displacements as design variables. Based on this idea the technique called Total Potential Optimization using Meta-heuristic Algorithms (TPO/MA) is proposed. The method has been successfully applied for linear and non-linear analyses of trusses and truss-like structures, and the results have shown that the approach is much more successful than conventional methods, especially for analyses of non-linear systems. In this study, the application of TPO/MA, with Harmony Search as the selected meta-heuristic algorithm, to cables net system is presented. The results have shown that the method is robust, powerful and accurate.

• Journal of Nutrition and Health
• /
• v.44 no.4
• /
• pp.326-337
• /
• 2011

The purpose of this study was to investigate dietary intake and to evaluate patient satisfaction toward the quality of hospital foodservice. Questionnaires were distributed to 203 hospitalized patients in 3 hospitals having 300 beds. The intake rates for served amounts of rice, side dishes, and soup were 72.5%, 68.2%, and 62.6%, respectively. The main reasons for left-overs were 'no appetite' (25.8%) and 'not salty enough' (19.9%). The rate of patients eating outside food was about 33.5%. The average score for quality satisfaction of meal characteristics was 3.34 ${\pm}$ 0.61, and the average score for quality satisfaction of sanitation and service characteristics was 3.58 ${\pm}$ 0.61. 'Seasoning' showed the lowest score and 'temperature' showed the highest score for quality satisfaction of meal characteristics. In the quality satisfaction of sanitation and services, 'explanation of meals' showed the lowest score and 'exactness of meal times' showed the highest score. The patients hospitalized for 10 days showed significantly lower average scores than those hospitalized over 60 days for quality satisfaction of meal characteristics. The patients with 'little appetite' and 'regular appetite' showed significantly lower average scores than those with 'much appetite' for the quality satisfaction of meal, sanitation, and service characteristics. The patients who 'rarely had leftovers' showed significantly higher average scores than those who 'always had leftovers' and 'often had leftovers' for quality satisfaction of meal characteristics. Meal characteristic scores were significantly correlated with age (r = 0.216), length of admission (r = 0.310), appetite (r = 0.251), leftovers (r = 0.233), and intake of soup (r = 0.205). Also, sanitation and service characteristics scores were significantly correlated with age (r = 0.327), education (r = -0.202), length of admission (r = 0.168), and appetite (r = 0.155). Thus, it would seem to be desirable that hospital foodservices improve the taste and seasoning of meals and provide appropriate nutrition education and counseling in mid-sized hospitals.

• Journal of Advanced Navigation Technology
• /
• v.13 no.1
• /
• pp.79-86
• /
• 2009

As information communication technology developed we could monitor temperature, weather, indoor and outdoor status which we need to monitor using various sensors. Even further we could monitor our body such as Sa02 and serologic chemical tests easily at home or office. It is possible though interlocking the house medical instrument with the wireless public data network. Data from sensors can be transmitted to the distant control room and will be essentially applied through wireless public data network. In this study we measured various sensor data for the telemetry in one system. The sensing items are mainly focused on the static and dynamic behaviors of the bridge, building, instruments. The study suggests the transmit system model utilized by the wireless public data network. The suggestion in the study of telemetry system provides movement and preservation. And it will exam various condition in distance or at home.