• Journal of Biosystems Engineering
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• v.26 no.6
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• pp.545-552
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• 2001

Nondestructive methods such as ultrasonic and magnetic resonance imaging systems have many advantages but still much expensive. And they do not give exact color information and may miss some details. If it is allowed to destruct a biological object to obtain interior and exterior informations, 3D image visualization model from a series of sliced sectional images gives more useful information with relatively low cost. In this paper, a PC based automatic 3D visualization system is presented. The system is composed of three modules. The first module is the handling and image acquisition module. The handling module feeds and slices a cylindrical shape paraffin, which holds a biological object inside the paraffin. And the paraffin is kept being solid by cooling while being handled. The image acquisition modulo captures the sectional image of the object merged into the paraffin consecutively. The second one is the system control and interface module, which controls actuators for feeding, slicing, and image capturing. And the last one is the image processing and visualization module, which processes a series of acquired sectional images and generates a 3D volumetric model. To verify the condition for the uniform slicing, normal directional forces of the cutting edge according to the various cutting angles were measured using a strain gauge and the amount of the sliced chips were weighed and analyzed. Once the 3D model was constructed on the computer, user could manipulate it with various transformation methods such as translation, rotation, and scaling including arbitrary sectional view.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.45 no.8
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• pp.686-696
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• 2017

The major objective of this study is to develop and verify the KAUSAT-5 based on the modular 3U CubeSat standard platform. In the mechanical system design of a 3U standard platform, subsystem and micro equipment functions/performance should be integrated and miniaturized on micro-sized PCBs and electrical capability was maximized to accommodate multiple payloads. KAUSAT-5 is 3U-sized Cubesat which will be operated in Low Earth Orbit(LEO), which implements mainly two scientific missions; one is to observe the Earth through infrared camera and the other is to measure space radiation with a Geiger Muller tube. An additional mission is to verify the equipment(device) such as VSCMG and fuzzy logic-based MPPT internally developed. The results of ETB, qualification and acceptance level environmental tests were shown to verify standard platform and KAUSAT-5 Cubesat.

• Journal of Korean Medical classics
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• v.19 no.3
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• pp.65-99
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• 2006

송대통치자희환의약병중견의학적발전. 축소궁정의료궤구(縮小宮廷醫療机構), 각확대평민의료여의약유관적자선궤구이개선백성의료조건적정책방향흔진보적. 장의적엄범지수집, 교정(校訂), 편찬(編纂), 반포이수존의학문헌(頒布以收存醫學文獻), 병차위의학적전파화보급작출봉헌. ${\ulcorner}$내경(內經)${\lrcorner}$, ${\ulcorner}$상한(傷寒)${\lrcorner}$ 등기초이론적연구방면상야운용(等基礎理論的硏究方面上也運用), 금원시기성위료학술쟁론적기출, 저시송대의정상최성공적정책(這是宋代醫政上最成功的政策). 유정부엄구약물, 수정본초병건립제약공창화약점(修訂本草幷建立製藥工廠和約店), 전매약물(專賣藥物), 개혁제형, 이발전'성약'(以發展'成葯'), 통일용약적규범등(統一用藥的范等), 저양적조시향약물적발전화의약적민중화흔대적영향. 의약교육방면상(醫藥敎育方面上), 재태의국화국자감리건립적'의학'교육제도유흔다건공, 궤구적예속, 전과(專科) 적분과(的分科), 고시제도(考試制度), 학교관리등도적료신경험(學校管理等都積了新驗), 의학상이'삼사법'(醫學上以'三舍法') '공액'위려의학교육적조시('貢額'爲勵醫學敎育的措施), 저치득긍정적(這値得肯定的). 송대의학교육상야유과착(宋代醫學敎育上也有過錯). 비여(譬如), 인제도적존폐이유실교육적연속성(因制度的存廢而有失敎育的連續性), 이방애의약교육경금적척축화계승(以妨碍醫藥敎育經驗的積蓄和繼承), 불단결핍잠력, 상실동력이차몰건립전문약학교육(喪失動力而且沒建立專門藥學敎育). 대부분수요의정궤구적건립(大部分需要醫政机構的建立). 단시유례속관사흔옹제적문제, 인위피상부소속궤관소견체소이불구통일적지도화협조, 최고의정궤구'한임의관원'야몰유통제의약궤구적권한(最高醫政机構'翰林醫官院'也沒有統制醫藥机構的權限), 직책중복(職責重複), 인원과잉(人員過剩), 의관원본신이야유흔다과잉리인원, 부구엄격적관리제도. 인비송대의관관리방면상강락료총효율(因比宋代醫官管理方面上降落了總效率).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.7
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• pp.3261-3266
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• 2012

Sodium borohydride($NaBH_4$) known as the material of hydrogen generation and storage can produce the hydrogen via catalytic hydrolysis. This protide chemical could be used in the hydrogen supply system for residential and mobile fuel cells, and thus many researches and developments regarding to these chemicals and decomposition reactions have been implemented. We experimented the hydrolysis of $NaBH_4$ alkaline solution by metal oxide-supported PGM(platinum group metal) catalysts and measured the generation rate of hydrogen which is product of decomposition reaction. We compared oxides as catalyst supports, and the precious metals, Pt and Ru for the catalysts and studied the effects of amounts of catalyst added and $NaBH_4$ concentrations on the hydrogen generation rates and patterns.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2005.11a
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• pp.235-239
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• 2005

A 30-tonf-class fullscale thrust chamber for the application to a LEO SLV has been combustion tested over the wide ranges of a mixture ratio and a chamber pressure. The thrust chamber designed for an open cycle engine with a turbopump was tested with a ablative combustion chamber instead of a regenerative chamber to first evaluate its performance and function. The test results revealed stable combustion characteristics. The hardware survived the harsh environment and showed very sound functional characteristics. The estimated combustion efficiency of the chamber turned out to be 95% and a specific impulse at sea level was estimated as 254sec, which are comparable to or above the predicted design values.

• Korean Journal of Microbiology
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• v.41 no.2
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• pp.146-151
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• 2005

To construct an amylolytic industrial strain of Saccharomyces cerevisiae, the glucoamylase cDNA gene (GAl) from Aspergillus awamori was expressed under the control of the alcohol dehydrogenase gene promoter (ADC1p) and integrated into the chromosomes of industrial S. cerevisiae. An integrative cassette lacking bacterial ampicillin resistance gene but containing the GA1 gene, $\delta$ sequences of Ty1 retrotransposon as target sites for homologous recombination and S. cerevisiae aureobasidin A resistance gene (AUR1-C) as the selection marker was constructed to obtain a strain eligible for commercial use. Industrial S. cerevisiae transformed with this 15-integrative cassette efficiently secreted glucoamylase into the medium and grew on starch as the sole carbon source. The transformants were mitotically stable for 100 generations in nonselective medium.

• Korean Journal of Microbiology
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• v.41 no.2
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• pp.93-98
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• 2005

The sphingosine kinase gene, which is 969-nucleotide long, was identified during the whole genome sequencing of Sphingomonas chungbukensis DJ77. The amino acid sequence showed the identity of $55\%$ with that of Zymomonas mobilis subsp. mobilis ZM4. C2, C3, and C5 domains of eukaryotic sphingosine kinase were found in sphingosine kinase from Sphingomonas chungbukensis DI77. One of these three conserved sites, GGDG, was predicted as a ATP-binding site, and the functions of the others were unknown currently. The phylogenetic tree constructed by ClustalX indicated that the sphingosine kinase of S. chungbukensis DJ77 was near the phylogenetic group COG1597, and did not belong to the group of diacylglycerol kinase of the same strain. The recombinant sphingosine kinase was expressed in Escherichia coli, but it was made in form of inclusion body.

• Journal of Korean Society of Steel Construction
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• v.23 no.3
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• pp.305-316
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• 2011

As the building structures are higher and bigger, the high-performance steels of high strength, toughness, and low yield ratio had been required and developed. In this paper the behavior of the moment connection with bolted web and high strength steel was studied by using the finite-element analysis computer program of ABAQUS. The analysis model is based on the test results and the same cyclic load history was applied at the FE(Finite Element) model until it failed in the test. Through the FEA, several indicators hardly measured from the test were acquired. These indicators related to stress and strain were selected from three plastic rotation stages: 0.003 rad, 0.03 rad, and final failure rotation. Specifically, at the final failure stage, the strain indicators producing the full plastic behavior were suggested as a mechanical property for steel.

• Journal of Korean Society of Steel Construction
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• v.23 no.3
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• pp.377-384
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• 2011

Recently, for the purpose of reducing work terms and improving performance for construction work, various methods in structure field were developed. This included the HRC system which is applicable to a typical structure (e.g., parking and office building). The HRC system introduced the Gerber Joint to raise structural efficiency and used connection plate to bolt HRC composite beam to H beam in the construction field. In this research, the experimental tests for six specimens, which were in the same field conditions, were conducted with several parameters such as the length and height of the connection plate and the number of stub bolts. The test result was compared with those made by current design codes for the deflection and strains of the main bar. Within the given load, the integration of concrete in beam and connection plate, welded with stud bolts, was verified.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.629-632
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• 2008

As concrete is a material which is subject to wide quality fluctuations by temperature, grip of seasonal feature and maintenance of ambient temperature and humidity to secure the quality required after casting concrete are able to keep away from harmful effects. In case of summer, a high temperature has caused rapid hydration reaction of cement in early age, which has caused to decrease strength by autogenous shrinkage. Therefore we need to consider a countermeasure for decrease in the hydration heat of hot-weather concrete, according to minimize water and cement content and use mineral admixtures In this experimental research, the compressive strength development for replacement ratio of mineral admixtures, curing temperature and methods of concrete was investigated to confirm the effects of mixture design and curing condition on compressive strength of concrete.