• Proceedings of the Korean Institute of Building Construction Conference
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• 2009.05b
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• pp.239-242
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• 2009

As the high-rise building increase due to the gravitation of population to big cities recently, it requires high quality and high performance of Concrete. As a result, people are keenly interested in Meta-kaolin as new admixture favorable from an economic perspective, which has strength and endurance with admixture at the same level like Silica-fume. Accordingly, as to Meta-kaolin, this study was to set by three levels like domestic one, foreign one, and Silica-fume, the water-binding material ratio 25%, and four level substitute like 0, 10, 20, and 30(%) in order to compare and analyze the quality durability of high-concrete according to the substitute of Meta-kaolin applicable with replacement of Silica-fume. As a result of performing experiment it was found that when water-binding material ratio increases, resistance of neutralization, carbonation, salt damage and sulfate decrease, and when replacement ratio of mineral admixture increases, depth of accelerating carbonation gets greater. Also, the combination of SF and MK-B favored resistance to chloride ion penetration better than MK-A, and it was found that when replacement ratio of binding material increases, the resistance to sulphuric acid increases. Therefore, based on this study, it was understood that meta-kaolin is useable in replacement of silicafume.

• Journal of Veterinary Clinics
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• v.28 no.4
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• pp.452-456
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• 2011

5 year-old female Siberian husky which was 27 kg had presented with a recurrent rhinitis with chronic discharge and cough. A nasal foreign material had been suggested by a finding of a bone density ($0.3{\times}0.3$ cm) in the left nasal cavity on X-ray and CT-scanning. Soft tissue opacity in frontal sinus and nasal cavity was increased and foreign material was located beside turbinate bone in the left nasal. We found that there was the increase in the number of eosinophil and mast cell by the nasal cytology test. These results mentioned above indicated that the rhinitis by nasal foreign body was suspicious. We decided that the transfrontal rhinotomy could be the proper procedure to approach the material in this case. After rhinotomy, the foreign body and severe sticky discharge were removed. Drain was placed through the hole and into the frontal sinus and nasal cavity which were flushed two times a day for 7 days. The clinical signs such as cough and nasal discharge were shown to be improved in the every visiting for the re-check. On the $40^{th}$ day after surgery, we could confirm that the most of soft tissue density in the frontal sinus and nasal cavity was decreased by CT-scanning. However, foreign body was not identified by histological examination. For the treatment of chronic rhinitis caused by foreign body, the surgical method such as rhinotomy can be applied, when it is difficult to remove it in the guide of the nasal endoscope.

• Korean Journal of Plant Resources
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• v.13 no.2
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• pp.147-153
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• 2000

Experiments were carried out to determine the effects of culturing conditions DCI(Day required for Colonization after Inoculation), CR(Contamination Rate), MD(Mycelial Density), DPI(Day required for Primordial sclerotia formation after Inoculation), yields, and degree of the foreign materials formations in Poria cocos sclerotia. The upper and bottom side of wood logs were covered with gauze, rice hull and floating leaves, vinyl, or covering cloth in order to prevent foreign material formations in p. cocos. The major results were positive in the order of rice hull, floating leaf, vinyl, gauze, and covering cloth covered and dwindled. In case of the upper and bottom sides of the wood logs covered with rice hull, DCI required 50 days more when compared with the control group(45 days) and CR was 0%, while the control group showed 2% CR. MD was excellent in case of conventional methods as against control's. DPI required 17~20 days less when compared with the control group(82 days). Yields of p. cocos in case of the upper and bottom side of wood logs covered with rice hull were 5.87kg, which is 35.7% higher than that of the control group(4.33kg), and 5.62kg in the case of upper sides cover only(increased by 29.8% compared with control), and 5.59kg in the case of bottom side cover only(increased by 29.1% compared with control), and foreign materials were none. In a separate experiment, where the upper and bottom sides of wood logs were covered with rice hull to prevent the foreign material formation, the results were as follows : Sclerotia formation status and quality of P. cocos were effective in the order of 20cm, 40cm, and 60cm of buring depth and dwindled. In 20cm of burying depth, DCI was shortened by 5 days and CR was none, while the control group showed 2% CR. MD was remarkably fine at the mulched conditions. DPI was shortened by 20 days when compared with the control(62 days).

• Journal of the Semiconductor & Display Technology
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• v.21 no.2
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• pp.51-56
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• 2022

Recently, the demand for semiconductors is expanded to various industries, and the use of high-quality and high-performance chips is increasing. With the trend, the diameter magnification and high integration of the semiconductor wafers are mandatory. As a result, there is a growing demand for the productivity improvement and the surface precision. There have been many studies on the stabilization of the wafer manufacturing processes in order to satisfy those specifications. Many complaints have been appealed by the wafer buyers that there are many unacceptable wafers with surface defects and foreign material adhesion which are caused by the vibrations during transportation. This study intends to derive the material improvement of the packing box of the wafers to suppress the vibrations of the box, and eventually to reduce the surface defects and the foreign material adhesion. The result shows that optimal material can substantially decrease the vibration of the packing box.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1982.05a
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• pp.6.2-7
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• 1982

We have observed foreign bodies in food and air passage in 270 cases during the period from Sep. 1976 to Aug. 1981 in E.N.T. department of Han Gang Sacred Heart Hospital. The following results were obtained. 1) Distribution of location was 256 cases (94.8%) in food passage and 14 cases(5.2%) in air passage. 2) Age distribution was predominent in under 5 years old showing 198 cases(77.7%) in food passage and 10 cases (71.4%) in air passage. Under 5 years old group in the cases of food passage, coin was the most frequent material : 175 cases(87.9%), and in the cases of air passage, plastic material was the most frequent material : 5 cases(50.0%). Over 40 years old group in the cases of food passage, bony pieces was the most frequent material : 8 cases(47.1%), and meats was second frequent material: 6 cases. 3) Male seems to be more frequently involved than female in cases of food and air passage. Food passage - Male: Female - 151 : 105 (1.4:1) Air passage - Male : Female - 10:4 (2.5:1) 4) Coin was the most frequent foreign body in food Passage (199 cases-77.7%). Others were metals, bony pices, and meats. Plastic material was the most frequent foreign body in air passage (7 cases-50%). 5) In the locality of food passage, the first narrowing of the esophagus was the most frequent site, and air passage, the bronchus-especially right bronchus-was the most frequent site. 6) During of lodgement was 218 cases (85.2%) within 24 hours in food passage and 9 cases (64.3%) within 24 hours in air passage, and in air passage one case visited 5 months later after the accident.

• Korea Trade Review
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• v.45 no.2
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• pp.51-65
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• 2020

According to an analysis of 560 foreign-invested companies investing in South Korea's manufacturing industry, the following three facts were found. First, the proportion of sales by manufacturing foreign-invested companies is divided into 68.5 percent of domestic sales and 31.5 percent of exports. From 68.5 percent of domestic sales, sales to Korean companies are 60.5 percent, including 37.1 percent for large companies and 23.4 percent for small and medium-sized companies, while only 8.0 percent for domestic consumers. Second, the investment sectors of manufacturing foreign-invested enterprises are 'machine and equipment manufacturing', 'chemical and chemical-chemical material manufacturing-excluding pharmaceuticals', 'electronic components, computers, video, sound and communication equipment manufacturing' and 'vehicle and trailer manufacturing'. It overlaps with electric·electronics, petro-chemicals and automobiles, which are Korea's main industries and areas of Korean global companies. Third, 31.5 percent of the sales of foreign-invested companies in the manufacturing sector are exported. Foreign-invested companies export their products to use them for their parents or affiliates or to the third countries. The analysis shows that foreign-invested companies invested in Korea for B2B transactions with Korean companies. The implications are that Korea can attract foreign investments by utilizing Korean companies' demand for intermediate goods. Foreign-invested companies can invest in Korea in order to use Korea, which has signed free trade agreements with the US, the EU and ASEAN, as an export platform.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.4
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• pp.297-317
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• 2018

The purpose of this study is to propose a classification system that can classify various industrial and craft materials consistently and systematically by comparing and analyzing the classification system of materials libraries in domestic and foreign. For this study, it was investigated the operation cases and classification system of domestic and foreign material libraries, and then proposed a method to classify consistently and systematically by comparing and analyzing the classification items of KDC and DDC. The classification system of material library was not classified by subject, but classified into the name of material and type, or the classification system of a material library was divided by Arabic numeral as a general classification system. It is difficult to access and share information because most of material libraries use the classification system developed by the library itself. Therefore, it is necessary to develop a standard classification system to share the information stored in the material libraries.

• Investigative Magnetic Resonance Imaging
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• v.19 no.2
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• pp.127-130
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• 2015

Direct injection of foreign material, such as liquid paraffin and silicone, into the breast can induce a foreign body granulomatous reaction and fibrosis, resulting in hard, nodular breast masses and architectural distortion that can mimic neoplasm. Conventional methods, including physical examination, mammography, and ultrasonography are of little use to differentiate between foreign body-induced mastopathy and breast cancer. In patients with foreign body injection such as breast augmentation, dynamic contrast enhanced MR imaging is an excellent imaging modality. Here, the authors report the MR imaging and pathological findings of ductal carcinoma in situ (DCIS) with multicystic changes in a 41-year-old woman with a previous history of interstitial mammoplasty by paraffin injection.

• Proceedings of the SAREK Conference
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• 2007.11a
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• pp.600-605
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• 2007

In this study, the risk rates of different contamination sources of the Foreign material in a minienvironment were analyzed through CFD simulation. From the results, the ambient contamination sources mainly affect wafers in the FOUP, whereas the internal contamination sources mainly affect wafers laid on the robot arm in the minienvironment. And the purging plenum system is very useful in protecting the wafers in the FOUP from Foreign materials transferred from the FFU. However, this system is unable to protect the wafers on the robot arm from internal Foreign materials and the wafers in the FOUP from sources of the interface between the FOUP and the minienvironment.

• Journal of Korean Elementary Science Education
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• v.30 no.1
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• pp.38-50
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• 2011

As the rate of foreign workers increasing, the rates of their children are rising, as well. The children's native countries vary from Japan, China to Indonesia, and difficulty of learning is expected in their entering the regular education due to the differences in the contents and curriculum they had learnt. This study analyzed the science textbooks of five Asian elementary schools including Korea, China, Indonesia, Thailand, and Iran-in diversified sides focusing on the content of earth science, for the children of foreign workers. The characteristics of the elementary science textbooks of the subject countries were compared in seven criteria-the rate of earth science in the textbooks, how units are arranged, whether the earth science contents are included, the contents highly related to their socio-cultural traits, photographs, scientific inquiries, and test items. The textbooks showed numerous differences with their own characteristics, and it is expected that the children of foreign workers would face difficulties in studies taking parts in the Korean formal education. Hereupon, this study proposes the needs of development of sub-materials for the children of foreign workers adapting to schools, and reinforcement of educating teachers for understanding children, with a national plan for the children excluded from education due to problems such as an illegal residence.