• KIPS Transactions on Software and Data Engineering
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• v.7 no.8
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• pp.287-296
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• 2018

In the recent commercial DBMS market, as the users' burden and complaint which are related to high price licensing policy and late technical support service are increasingly rising, the concern for use of open source DBMS which has no problem with compatibility or stability is escalating. Due to the fact, the cases saving the cost are growing by converting Oracle Corporation's applications, which has about 60% share in the DBMS market, to an open source DBMS. However, in converting non-interchange sentences to an ANSI standard-based open source DBMS because of the use of PL/SQL in Oracle Corporation provides, a lot of manual work accompanies, so there is a lot of loss of time and money. Therefore, a tool that automatically converts PL/SQL to standard SQL is required. The proposed automation tool for the conversion of applications converts PL/SQL to Java Stored Procedure, an open source DBMS-based ANSI standard programming language. Through carrying out a test on the automation tool, it is proved that the tool will contribute to shortening time and saving cost by verifying the identity of input-output data and its reliability after correcting errors in converting to Java Stored Procedure.

• Korean Journal of Animal Reproduction
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• v.5 no.1
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• pp.36-42
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• 1981

This experiment was carried out to determine the optimum interval between inseminations in artifical insemination of hens. Two hundred and forty hens of Hisex commercial stock at 25 weeks of age and 20 cocks of the Rhode Island Red at 40 weeks of age were used for the experiment, and a total of 6,784 eggs were obtained. The intervals between inseminations compared in this study were: 3 days (T1), 5 days (T2), and 7 days(T3). Mixed raw semen was inseminated and the semen does was 0.03ml per insemination per hen. The inseminations were conducted at 15:00 at each time. The total number of insemination performed was 9 for the T1, 6 for the T2 and 5 for the T3, and eggs were collected over a period of 31 days, 32 days and 35 dyas, respectively. The average egg production of the hens during the experiment was 85.9% and the average temperature during the experiment was around 30$^{\circ}C$. The average sperm count was 3.69 billion per ml. The results obtained in this experiment can be summarized as follows: The fertility over the entire experimental period bythe treatment was 91.7% for the T1, 84.4% for the T2, and 75.2% for the T3. The difference between T1 and T3 in fertility was significant at 5% level. The average fertility on the second, third and fourth day after the insemination in the T2 and T3 was maintained at a relatively high level, but it tended to decline rapidly from the fifth day after the insemination. The average fertility for one week after the last insemination was 88.8% for the T1, 88.8% for the T2 and 78.6% for the T3, and none of the differences among the treatments were statistically significant. On the basis of the results from this study, it is recommended to adjust the insemination intervals within the range from the 3 to 5 days in order to maintain a highest level of fertility in the hens at an early stage of egg production as in the case of the hens used in this experiment. An insemination interval of 3 days is recommended, especially at an initial stage of insemination. For the hens with a low fertility, shortening, of the insemination interval to 3 or 2 days is desirable.

• Journal of the Korean Society of Industry Convergence
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• v.21 no.3
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• pp.141-147
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• 2018

In a time when product development cycles are getting shorter and shorter, many companies are making efforts to develop products with high reliability in a short period of time, accelerated life test is widely used as a method to quickly evaluate reliability. Accelerated life test reduces the test life or the life of the product from the observed data by shortening the lifetime of the product or abruptly lowering the performance under the worse condition than the actual condition in order to shorten the test cost or the test time. In this paper, BL3640A-06P+RB35, DC12V model, which is used in the support device of an automatic rotation type digital signage, which display various information such as textures and images on a display screen in a public place or a commercial space, BLDC motors were subjected to a constant stress test and at the rotational speed of 1rpm, $180^{\circ}$ rotation and reverse rotation under actual use conditions, the stress was imposed on the rotating speed of 2rpm and the weight of the actual installed product from 22.2kgf to 10kgf were installed. The lifetime of the actual use environment condition is 23,545 hours and the rotation speed is accelerated. The life time of the acceleration condition with the additional weight is 1,380 hours. The acceleration factor is calculated as 17.06, the one year guarantee test day is 235 days to 14 days, of the period from 470 days to 28 days, and the third year from 704 days to 42 days. The test date of the BLDC motor was tested on the shortened test date, and the rotational speed and the current value were measured. It is found that there is no defect even if it operates as the test date corresponding to the specified one year warranty period and the 3 year accelerated life test which is experimented. Using the statistical technique of the regression analysis the expected time for the motor to defect to #4 samples was 20 years.

• Journal of Korean Society of Environmental Engineers
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• v.28 no.1
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• pp.1-6
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• 2006

Biological nutrient removal(BNR) process used in this study, which was packed with EPS(expanded polystylene) media, has more many advantages in aspect of reducing hydraulic retention time(HRT) of the process and having less effect of temperature in the winter season than commercial process in the present. Bench-scale study was performed using domestic wastewater. In the results, it was observed that the T-N removal efficiencies in HRT 6 hr and HRT 4 hr were 55% and 51%, respectively, showing the small reduction (about 4%) of T-N removal efficiency according to shortening of HRT. In comparison of T-N removal characteristic in summer and winter seasons, it showed that T-N removal efficiencies in summer and winter seasons were 65% and 54%, respectively, showing the 11% lower T-N removal efficiency in winter season than in summer season due to deterioration of nitrification in winter season. In the studies of influent loading rate and C/N ratio, the process showed stable effluent quality under the condition of broad influent loading rate and C/N ratio. Therefore, it is anticipated that the developed process in this study could be applicable to small wastewater treatment plant in nutrient removal.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.22 no.3
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• pp.211-221
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• 2009

With recent trends of super-tallness, atypical plan shapes and zoning constructions in high-rise buildings, a structural stability of the building under construction is arising as a key issue for design and construction plan. To ensure the structural stability under construction, the differential column shortening of vertical members, the lateral displacement of tower frames, and differential settlement of raft foundation by unbalanced distributions of a tower self-weight before the completion of a lateral load resisting system should be checked by construction sequence analysis, which should be performed by systematic combinations with structural health monitoring, construction compensation program, and construction panning. This paper presents the scheme of zone-based construction sequence analysis by using the existing commercial analysis program, to check the stability of high-rise building under construction. This scheme is applied to 3-dimensional structural analysis for a real high-rise building under construction. The analysis includes real construction zoning plans and schedules as well as creep and shrinkage effects and time-dependent properties of concrete. The simplified construction sequence and assumed material properties were continuously updated with the change on construction schedule and correlations with in-situ measurement data.

• Journal of Mushroom
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• v.6 no.3_4
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• pp.121-125
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• 2008

A first, we made white strain 'S line' adaptable to elevated temperature after collected brown strains were characterized with culture characterization on temperature and their monokaryons isolated at the high temperature were crossed with white strain. These S line monokaryons were crossed again with other monokaryons derived from a commercial white. As a result of successive crossing, finally a new variety 'Baengno' was developed. The optimum temperature of mycelial growth was $25^{\circ}C$ but it needed to adjust to $18{\sim}20^{\circ}C$ when incubated at the bottle cultivation. It brought incubation period shortening as 21 days saved 2~3 days when compared with other white varieties. The optimum temperatures of fruiting body initiation and development were almost same to others like as $14^{\circ}C$ and $7^{\circ}C$, respectively. Fruiting body of 'Baengno' was pure white even developed from crossing with brown strains. 'Baengno' was a good variety with high quality and high productivity characterized as quite even budding habit, long stipes and hemi-spherical pilei. This variety needed more air ventilation and had to be adjusted its cultivation environment for the good cultivation.

• Food Science and Industry
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• v.55 no.2
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• pp.188-202
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• 2022

In the insect industry, as the scope of application of insects is expanded from pet insects and natural enemies to feed, edible and medicinal insects, the demand for quality control of insect raw materials is increasing, and interest in securing the safety of insect products is increasing. In the process of expanding the industrial scale, controlling the temperature and humidity and air quality in the insect breeding room and preventing the spread of pathogens and other pollutants are important success factors. It requires a controlled environment under the operating system. European commercial insect breeding facilities have attracted considerable investor interest, and insect companies are building large-scale production facilities, which became possible after the EU approved the use of insect protein as feedstock for fish farming in July 2017. Other fields, such as food and medicine, have also accelerated the application of cutting-edge technology. In the future, the global insect industry will purchase eggs or small larvae from suppliers and a system that focuses on the larval fattening, i.e., production raw material, until the insects mature, and a system that handles the entire production process from egg laying, harvesting, and initial pre-treatment of larvae., increasingly subdivided into large-scale production systems that cover all stages of insect larvae production and further processing steps such as milling, fat removal and protein or fat fractionation. In Korea, research and development of insect smart factory farms using artificial intelligence and ICT is accelerating, so insects can be used as carbon-free materials in secondary industries such as natural plastics or natural molding materials as well as existing feed and food. A Korean-style customized breeding system for shortening the breeding period or enhancing functionality is expected to be developed soon.