• Journal of Korea Society of Industrial Information Systems
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• v.13 no.2
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• pp.18-27
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• 2008

In recent years, the functions added ta an embedded system have grown various and complex in most parts of the applications. Embedded software comes to include more functions and is getting bigger. Therefore it is getting difficult for software developers to keep the development time to market on time. This leads to a need for adequate design and test technique for embedded software. In this paper, we propose a software architecture style for embedded software. It facilitates the composition of reusable functions and helps developers reduce development time. We also propose a test method and tools for embedded software running on target systems.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1993.04a
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• pp.98-98
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• 1993

어류를 이용한 독성 평가방법 및 기작에 관한 연구의 일환으로 여성 호르몬의 일종인 17$\beta$-estradiol (E$_2$)의 갑상선 종양 유발 촉진성을 검증하기 위하여 부화 후 7＋1일 된 암수동체성 어류인 점박이송사리 (Rivulu marmoratu) 를 N-methyl-N'-nitrosourea (MNU) 가 10 ppm 의 농도로 녹아있는 완충 사육수에 2시간 동안 전신 노출시켜서 갑상선 종양의 유도를 촉발 (initiation) 시킨 후, E$_2$가 포함된 시험 사료 (E$_2$ 20 mg/kg diet와 E$_2$ 80 mg/kg diet) 와 이에 대한 대조 사료를 30일간 먹여 사육하였다. 그 후 80일 동안 정상사료인 염전 새우의 유생으로 키우며 매 15일 간격으로 갑상선 종양의 발생 여부를 확인하였다. 발암원 처리 후 E$_2$ 가 함유되지 않은 사료로 사육한 대조군에서는 2.4% 의 개체에서 갑상선 종양이 유도된 반면, E$_2$ 20 mg이 함유된 사료를 투여한 실험군에서의 갑상선종양 유발율은 34%로, 대조군에서 보다 14배 정도 증가하였다 (p<0.01). MNU 처리 후 E$_2$ 60 mg/kg 사료를 먹인 실험군에서의 갑상선 종양 유발율은 E$_2$ 20 mg/kg 사료를 먹인 실험군에 비하여 발암 잠재기 (latency)가 15일 정도 단축되었다. 본 실험의 결과는 E$_2$가 다단계 (multistage)로 이루어진 갑상선 종양 발생기작에 발암 촉진제로써의 역할을 한다는 것을 입증할 뿐만 아니라, 본 종이 갑상선 종양의 발생 및 촉진기작을 연구하는데 매우 적합한 실험동물 모델임을 보여준다.

• International Journal of Highway Engineering
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• v.7 no.3 s.25
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• pp.93-100
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• 2005

Rock produced in situ has been used as the road construction materials in consideration of economies. However, because sedimentary rock is rapidly weathered, it is hard to decide appropriateness of quality specifications. This study aims at evaluation of usability for sub-base of muddy stone produced in situ. Test results show that the abrasion ratio is fitted for specifications, but weight loss in 37.5$\sim$16mm after Los Angeles abrasion test shows 47% in muddy stone in comparison with 20$\sim$30% in gneiss and sandstone. The soundness of aggregate shows higher value in muddy stone than in gneiss and sandstone. The weight loss from accelerated weathering test due to freezing and drying show 58% in muddy stone in comparison with 308$\sim$21% gneiss and sandstone.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.557-560
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• 2008

Fiber reinforcement has been being widely used in concrete to enhance the mechanical properties and to reduce the micro-cracking caused by plastic and drying shrinkage. While researches has been focused on the benefits of fiber reinforcement, the properties of fiber reinforced concrete are strongly dependent on the type, shape and the amount of fibers in concrete. In this study, the resistance of nylon fiber reinforced concrete against the chloride ion penetration was experimentally observed by NT Build 492. The test results showed that the addition of nylon fiber has little effect on the change of the resistivity of concrete to the chloride ion penetration.

• Journal of the Korea Concrete Institute
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• v.13 no.4
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• pp.397-405
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• 2001

In clod weather regions, a strong seasonal wind brings sea salts to the land. In addition to it, recently, the spreading amount of deicing salts has increased numerously for purpose of removing snow and ice. Thus the salts environment around concrete structures becomes so severe that various damages of concrete due to applied salts will be brought up. Much of countries such as America, Europe etc. is carried out study for effects of deicing salts on concrete. However, there are not test methods for deterioration of concrete subjected to both freezing-thawing and chloride in Korea. In this study, we carried out test for the compound deterioration subjected to both freezing-thawing and chloride attack, to investigate the effects of sodium chloride on the deterioration of concrete. The test was performed to investigate the effects of cement type, strength and air content on the scaling deterioration of concrete. As a result, the scaling deterioration was accelerated in the presence of salts. And the resistance to scaling was strongly influenced by the type of cement, the strength and air content of concrete.

• FLOWER RESEARCH JOURNAL
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• v.18 no.2
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• pp.93-97
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• 2010

The objective of this study was to investigate the effect of hot water and dipping times, and hot- PGR's solution on dormancy breaking of Lilium Oriental Hybrid 'Casa Blanca' and 'Siberia' bulblets regenerated in vitro. Hot-water treatments with distilled water were effective not sprouting rate but shortening of days to sprouting. While $100mg{\cdot}L^{-1}\;GA_{4+7}$ was effective in the dormancy breaking process of bulblets. The content of mitochondrial protein and fumarase activity were highest in bulblet of $100mg{\cdot}L^{-1}\;GA_{4+7}$ addition in hot water treatment. Therefore $GA_{4+7}$ addition in hot-water treatment seem to be the alternative dormancy breaking method to low-temperature treatment in Lilium Oriental Hybrid bulblet regenerated in vitro.

• Korean Journal of Food Science and Technology
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• v.23 no.4
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• pp.523-525
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• 1991

The stimulatory effect of oxygen on the browning of a soy sauce model system (glucose-glycine in 18% NaCl solution) with or without added organic acids were investigated. The group incubated aerobically browned at a significantly higher degree than the group incubated anaerobically. Organic acids also positively affected the browning of the soy sauce model system.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2014.05a
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• pp.170-171
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• 2014

The buildings constructed with steel structure is coated with certified fire resistive material to resist from fire. Coating materials lose their initial performances as time passes, so they need some maintenance. This study is covers standardization of the methods for assessing the durability of SFRM. In Korea, more than 90 percent of SFRM are used indoors. So This study is to decide proper test method through investigation and examination of effect factor to performance of fire-resistant structure and applicable test method.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2014.05a
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• pp.94-95
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• 2014

The purpose of this study is to evaluate the corrosion protective property of Al-Mg high-freqeuncy arc metal spray method in comparison to Zn-Sn and Zn-Al alloys by electrochemical method and CASS test. As a result, it appeared that Al-Mg alloy had very higher corrosion protective property through the electrochemical characteristic and the CASS test comparing with the other alloys.

• Proceedings of the Korea Concrete Institute Conference
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• 2000.10a
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• pp.425-428
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• 2000

When concrete structures are exposed to sulfate or marin environments, sulfate ions penetrated into concrete make it deteriorate. An accelerated test under potential difference method was performed to evaluate not only the sulfate ion diffusivity in ordinary portland cement and ground granulated blast-furnace slag cement concretes but the effect of slag replacement and water-cement ratio on the sulfate ions diffusivity. As the result of this study, we assumed the sulfate ion diffusivity was significantly related with total passed charge and initial current in concrete. Moreover sulfate ions penetration resistance of ordinary portland cement concrete was superior to that of ground granulated blast-furnace slag cement concrete.