• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2160-2163
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• 2005

Solid freeform fabrication (SFF) technology plays a major role in industry and represents a reasonable percentage of industrial rapid prototyping/tooling/manufacturing (RP/RT/RM) development applications. However, SFF technology still has long way to progress to achieve satisfactory process speed, surface finish and overall quality improvement of its application. Today, three dimensional printing (3DP) technique that is one of SFF technology is receiving many interests, and is applied by various fields. It can fabricate three dimensional objects of solid freeform with high speed and low cost using ink jet printing technology. However, need long curing time after manufacture completion. And it must do post-processing process necessarily to heighten strength of objects because strength of fabricated objects is very weak. Therefore, in this study, we proposed an improved 3DP process that can solve problems of conventional 3DP process. The general 3DP process is method to spout binder simply through printer head on powder, but proposed process is method to cure jetted UV resin by UV lamp after jet UV resin using printhead on powder. The hardening of resin is achieved strongly at early time by UV lamp in proposed method. So, the proposed process can fabricate three dimensional objects with high speed without any post-processing.

• 한국작물학회지
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• 제48권2호
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• pp.113-119
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• 2003

Soybean sprout pathogenic bacteria were isolated from the large, deep containers of a commercial factory. Over a period of one year, 40 pathogenic-like bacteria were isolated among a total of 732 isolates. In addition to bacteria previously reported to be associated with rotting, such as Pseudomonas putida and Erwinia carotovora, several other genera were also identified: Acinetobacter spp., Chryseobacterium spp., Klebsiella sp., Pantoea agglomerans, Bacillus sp. Fatty acid methyl ester (FAME) analysis using the Microbial ID (MIDI) system, and 16s rRNA sequence analysis, yielded identical results, confirming the identities of these microorganisms. Several types of selective media were not good for identification and determination of population structure in commercial environments, as colony type was not specific to the genus. There was no dominant bacterium, and we were not able to find the main bacterium responsible for soybean spout rot. Even though we did not identify a major target for controlling rot or screening for resistant cultivars, the results of this study indicated that bacterial rot of soybean sprout is endemic. In addition, it emerged that factory epidemics in summer are not caused by the bacteria isolated in this study.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1806-1809
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• 2008

Study that form micro pattern by direct ink jet printing method is getting attention recently. Direct ink jet printing spout fine droplet including nano metal particle by force or air pressure. There is reason which ink jet printing method is profitable especially in a various micro-patterning technology. It can embody patterns directly without complex process such as mask manufacture or screen-printing for existent lithography. In this study, research of a technology that ejects fine droplet form of Pico liter and forms metal micro pattern was carried with inkjet head of piezoelectricity drive system. Droplet established pattern while ejecting consecutively and move on the surface at the fixed speed. Patterns formed in ink are mixed with organic solvent and polymer that act as binder. So added thermal hardening process after evaporate organic solvent at isothermal after printing. I executed high frequency special quality estimation of CPW transmission line to confirm electrical property of manufactured circuit board. We tried a large area printing to confirm application possibility of an ink jet technology.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제35회 추계학술대회논문집
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• pp.577-580
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• 2010

기체메탄/액체산소를 추진제로 이용한 동축인젝터를 설계하였으며, 전단(기체)/전단(액체)형 인젝터와 전단(기체)/스월(액체)형 인젝터 두 가지로 제작하였다. 수류시험을 통해 두 가지 인젝터의 미립화와 분무특성을 알아보았다. 전단/전단형 인젝터는 물줄기 형태로 분무되고, 전단/스월형 인젝터는 hollow cone형태로 분무되었다. 전단/전단형 인젝터보다 전단/스월형 인젝터의 미립화 성능이 우수하였다.

• KIEAE Journal
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• 제5권3호
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• pp.49-56
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• 2005

Recently the Volatile Organic Compound, HCHO, a harmful object spout from the construction materials is made an issue of social problem. Also the appearance of the building where the confidentiality is high was interior air pollution and it was brought about a huge problem. The government research facility and a relation industry sector conducts a many effort to improves like this actual condition. The Diverse ability building material which contains the natural material of the jade, the charcoal and the hwangto instead of the finish material which contains the harmful chemical material, is becoming development and utility. Hereupon the study have carried out research on hwangto plaster that was composed of hwangto and rice straw. The result of test that is deduced by basic proportion is properly appeared with suitable ratio of the hwangto and the sand to 4:6~5:5 by the compressive strength and crack control, workability. The result of test, that adds the rice straw to basic blending for a crack control, appeared with the fact that it is most suitable 3%to add the rice straw that has a length of 0.5cm~2cm. The result of test that plaster over the large size to compare a cement plaster with a hwangto plaster show a similar efficiency by workability. Also it controlled the crack and peeling off actual condition which is discovered from the hwangto plaster of existing perfectly.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.III
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• pp.613-622
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• 2000

Watering operation for oyster mushroom growing houses is regarded as drudgery and time consuming farm operation for growers. Most of mushroom growing beds in oyster mushroom growing houses are designed as two-row with four floor beds, therefore the watering and ventilation between the bed floors are much difficult for farmers because of its structural design. The study aimed to reduce the watering operation and improve the mushroom growing environment through the humidification and air supply on mushroom growing beds. Results showed that appropriate size of nozzle is between 0.8~0.5ml/s for the humidification and higher than the 2.0ml/s for the watering. The optimum water supply pressure was regarded as between 1.0~2.0MPa and the uniform distribution of droplet on the bed showed on air flow speed of 14m/s. The prototype was equipped with twin nozzle with. the humidification nozzle of 0.85ml/s and watering nozzle of 5.0ml/s, and the air blast fan with the air speed of 10m/sec in each air spout. In the field test in a practical scale mushroom growing house, it was well operated dependant on the set desire by a electric control unit. The machine can be practically used as air blast watering and air blast humidification for oyster mushroom growing farms without manual.

• 정보처리학회논문지A
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• 제16A권4호
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• pp.255-262
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• 2009

유비쿼터스 센서 네트워크(USN)에 기반한 엔터테인먼트용 자율 돌고래 로봇의 구현에 관하여 소개한다. 일반적으로 수중에서 동작하는 생체모방 로봇에 유비쿼터스 센서 네트워크와 GPS를 적용하는 것은 불가능한 일이다. 본 논문에서 제안된 엔터테인먼트용 돌고래 로봇은 수중이 아닌 수면에서 동작하므로, 사용자와의 상호작용을 중요시하며 제안된 수중 로봇의 네비게이션은 GPS정보와 배치된 USN 모트로부터 얻어진 미세한 위치 정보로부터 수행된다. 본 논문에서는 제안된 돌고래 로봇의 기계적인 구조, 센서와 엑추에이터, 마이크로컨트롤러 보드와 수영 방법, 사용자와의 상호작용의 특징을 기술한다. 엔터테인먼트 돌고래 로봇은 유저에 의한 접촉 센서의 감지 신호를 입력받아 입을 움직이거나, 꼬리를 치고, 물을 뿜어내는 등의 전형적인 응답을 보인다. 로봇의 자율성을 위하여 경로 설정, 장애물 감지 및 회피 등과 같은 로봇의 움직임뿐 아니라 인간과 로봇의 상호작용에 관련된 기능들을 마이크로컨트롤러가 제어한다. 돌고래 로봇의 위치 정보는 배치된 USN 모트의 알려진 위치 정보로부터 주기적으로 교정된다.

• 생명과학회지
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• 제10권1호
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• pp.68-73
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• 2000

In order to develop new materials for the functional food, the components of safflower(Carthamus tinctorius L.) sprout was studied. Chemical composition, minerals, amino acids, and fatty acids of the leaf and the stem parts of 2 weeks grown safflower sprout were analyzed. The chemical composition of safflower spout was 12.7% (w/w) moisture, 28.5% crude protein, 10.1% crude fat, and 5.3% crude ash. Mineral contents of the leaf part were P 49%, K 22%, Mg 15%, Ca 10% whereas these of the stem part were K 51%, P 27%, S 10%, Ca 7%, Mg 4%. Other mineral contents were less than 2% in both parts. Especially, Pt was 0.18 ppb and 0.17 ppb in the leaf and the stem parts, respectively. The composition of the amino acid were approximately as follow, the major amino acid in the leaf and the stem were aspartic acid and glutamic acid, the contents of these were 10.7mg/g, 10mg/g in the leaf, 11.3 mg/g, 8.4 mg/g in the stem, respectively. The major fatty acids in the leaf and the stem parts were linoleic acid and $\alpha$-linolenic acid. The linoleic acid (C18:2) in the leaf and the stem parts were 67% (w/w) and 47% whereas the $\alpha$-linolenic acid. The linoleic acid (C18:2) in those parts were 14% (w/w) and 11%, respectively. On the basis of chemical analysis, the safflower sprout showed to have relatively high contents of crude protein and crude fat, minerals including small amount of Pt, polyunsaturated fatty acid as linoleic acid and $\alpha$ -linolenic acid. These results suggested that safflower sprout was found to be a useful material of natural health food for the functional food development.

• 한국식품과학회지
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• 제53권5호
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• pp.613-618
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• 2021

본 연구에서는 식초음료가 함유된 젤리의 품질특성에 관하여 식초음료 함량, 구연산삼나트륨 함량, 겔화제 함량에 따라 3단계에 나눠 제조공정에 따른 살균전후의 이화학적 특성을 연구하였다. 식초 음료의 함량을 달리한 젤리는 식초음료의 함량이 높을수록 pH는 급격히 낮아졌고 살균 후는 살균 전 보다 경도(hardness)가 현저히 낮아져 제형이 유지되지 않았다. 이는 pH와 높은 산도의 영향으로 보여 진다. 산도조절제인 구연산삼나트륨의 함량을 달리한 실험 결과 pH는 구연산삼나트륨의 첨가 함량의 증가는 살균전후 모두 구연산삼나트륨의 함량과 젤리의 경도(hardness)는 상관관계를 보였으며 살균 공정 후 젤리는 살균보다 경도(hardness)는 낮아져 pH와 살균 가열 조건이 겔화의 품질 주요 변수임을 확인하였다. 겔화제의 함량을 달리한 젤리의 경도(hardness)는 살균전후 모두 겔화제 첨가 함량의 증가와 상관관계를 보였다. 따라서 식초음료의 스파우트 젤리임을 고려할 때 제품 관능 속성에 부합될 수 있도록 pH 3.5-3.7, 글루코만난과 카라기난의 혼합겔의 함량은 0.4-0.5%가 적절하다고 판단되었다.

• 한국지구과학회지
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• 제37권4호
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• pp.187-199
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• 2016

이 연구에서는 2014년 6월 10일 일산에서 발생한 용오름에 대해 구름분해모델(CReSS)를 활용하여 재현실험을 수행하고 발생 메커니즘을 분석하였다. 종관적으로는 대기 상층의 한랭하고 건조한 공기가 남하하였으며, 대기 하층에서는 온난하고 습윤한 공기의 이류가 있었다. 이로 인해 대기 상 하층 기온의 큰 차이가 발생하면서 강한 대기 불안정을 야기 시켰다. 19시 20분에 일산 지역에서 스톰이 발달하기 시작하여 10분 만에 최성기에 도달하였다. 재현 실험 결과 이 때 발달한 스톰의 높이는 9 km이었으며, 스톰 후면으로 갈고리 에코(hook echo)가 나타났다. 일산 주변으로 발달한 스톰 내부에서는 활강 기류가 발생하는 것으로 모의 되었다. 모의된 하강기류가 지면에서 발산되어 수평 흐름으로 변하게 되었고, 이 흐름은 스톰의 후면에서 상승류로 전환 되었다. 이 때 후면에서 강한 하강기류가 발생하였는데 이 하강류가 전환된 상승류를 지면까지 끌어내려 지면에서 소용돌이도가 발달하게 되었다. 그 이후 이 소용돌이도가 연직으로 신장되면서 용오름이 모의되었다. 모의된 용오름에서 발달한 저기압성 소용돌이도는 360 m 고도에서 $3{\times}10^{-2}s^{-1}$이었으며, 용오름의 직경은 900 m 고도에서 1 km로 추정되었다.