• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 춘계학술대회 논문집
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• pp.600-605
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• 2012

In this paper, the acoustic performance of a shipboard large-sized room unit is studied. The room unit is a kind of rectangular absorptive chamber with a partition whose surface absorptive material with fabric skin is attached to. The room unit has one inlet and three outlet. At the inlet, a plane damper is installed to control the flow rate. The acoustic performance of a prototype room unit is measured using a HVAC mock-up. It is shown that its insertion loss is comparable with that of a commercially-used room unit but the developed room unit generates flow noise higher than the other one. The major source of flow noise is analyzed by NADS-R, the noise analysis program for room unit. Cone-shaped dampers are proposed to be used as the damper of a room unit to reduce flow noise. It is shown that the cone-shaped damper decrease flow noise remarkably.

• 한국소음진동공학회논문집
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• 제22권5호
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• pp.468-473
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• 2012

In this paper, the acoustic performance of a shipboard large-sized room unit is studied. The room unit is a kind of rectangular absorptive chamber with a partition whose surface absorptive material with fabric skin is attached to. The room unit has one inlet and three outlets. At the inlet, a plane damper is installed to control the flow rate. The acoustic performance of a prototype room unit is measured using a HVAC mock-up. It is shown that its insertion loss is comparable with that of a commercially-used room unit but the developed room unit generates flow noise higher than the other one. The major source of flow noise is analyzed by NADS-R, the noise analysis program for room unit. Cone-shaped dampers are proposed to be used as the damper of a room unit to reduce flow noise. It is shown that the cone-shaped damper decrease flow noise remarkably.

• 한국군사과학기술학회지
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• 제22권5호
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• pp.705-715
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• 2019

The purpose of this study is to analyze the necessity of organizing an exclusive unit to perform the division Engineering Reconnaissance, and how to organize exclusive unit. To this end, first, it was analyzed whether exclusive unit organization was necessary by using organization-conditions and AHP. Next, through ARENA model simulation and task-analysis, it was determined how many people would be organized, and how the class structure would be appropriate. As a result, first, it is reasonable to organize the Engineering Reconnaissance unit as an exclusive unit, and the best way is to organize all-time(war/peace time). Second, the exclusive unit should be organized into a total of 10 persons(2~3 cadres, 7~8 soldiers). We hope that the research will contribute to the rational procedure of our military unit structure organization and set the standards for applying the quantitative methodology.

• 한국식품영양과학회지
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• 제30권4호
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• pp.760-763
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• 2001

시판되는 새우젓의 새로운 기능성 지표를 제시하고자 단백분해효소의 활성 및 키토산 분해활성 등을 측정하였다. 시판 되는 새우젓의 염도를 측정한 결과. 29.8~48.3%로 제품에 따라 최대 19% 정도의 염도 차이를 보였다. 총질소량은 3510.5 ~7314.1 mg/100g 으로 A시료가 7314.1 mg/100 g으로 가장 높은 총질소 함량을 보인 반면 D 시료는 3510.5 mg/100 g으로 비교적 낮은 총질소 함량을 보였다. 아미노태 질소량은 321.2~723.9 mg/100g으로 총질소 함량이 가장 낮았던 D시료가 아미노태 질소 함량이 낮았다. 5개 시판 새우젓의 평균 펩타이드 길이(average peptide length: APL)는 10.1~15.0이었다. 휘발성 염기질소는 14.1~98.6mg/100g 으로 D시료에서 가장 높은 98.6mg%의 함량을 보였다. 단백질 분해효소 활성은 18~232 unit로 차이를 보이고 있으며 C번 시료의 단백질 분해 효소 활성이 232 unit로 가장 높은 효소활성을 보였다. Chitinase 활성은 14.4~171 unit의 활성을 보였으며 E번 새우젓이 171 unit로 가장 높은 효소 활성을 보였다.

• KIEAE Journal
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• 제12권6호
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• pp.77-84
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• 2012

The current architectural design of unit modular has been based on 2D of CAD program, so unit modular character which needs unit information management, as a dried-member system, has no effect on design process. The purpose of this study is We have developed a suitable BIM design process, according to various works of construction, then tried to contribute to supply and activation of the urban-life-housing based on unit modular. The BIM modeling process based on unit modular has been in order of unit combination with preparing manual classification, and, it has been constructed, at construction site, from housing foundation to roof finish by Bottom-up method. At a manufacturing factory, it has been produced in order of 1) grouping materials and parts, 2) fabricating unit boxes, and 3) interference examination of unit boxes, and each order has been classified as housing structure, architecture, plumbing process separately. At a construction site, the fabrication has been done in order of, like as a real housing construction scenario, 1) RC foundation work 2) unit module job-site-fabrication work, 3) roof truss work, 4) plumbing and HVAC work, and 5) housing interior finish work. After modeling process, the interference examination on each work of construction has finally completed modeling. The Unit modular utilizing BIM modeling can make easy housing maintenance through systematic control with preparing manual of unit module information, and securing accurate and speedy construction information. And it will promote design credibility and create maximum effect of unit modular construction method, such as construction period reduction and upgrade of construction quality, etc., through the computer simulation as real as construction environment in cyber space, and with the interfering examination.

• 한국산림과학회지
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• 제4권1호
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• pp.26-29
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• 1965

1) 본시험(本試驗)은 area sampling의 Form과 unit의 크기를 결정(決定)짓고져 행(行)하여진 실험(實驗)이다. 2) unit가 작은 것은 큰것에 비(比)해 과대추정치(過大推定値)를 주었다. 3) incular sample plot는 타(他)에 비(比)하여 과대추정치(過大推定値)를 준다. 4) area sampling에 있어서는 rectangular plot $0.06ha(20m{\times}30m)$가 가장 경제적(經濟的) unit가 된다. 또 circular plot를 사용(使用)할 때는 0.10 ha, square plot를 사용(使用)할 때는 0.08ha 보다 큰 unit를 사용(使用)해야만 population mean과 유의차(有意差)없어 추정(推定)할 수 있다.

• 한국미생물·생명공학회지
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• 제36권1호
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• pp.28-33
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• 2008

Streptomyces griseus trypsin (SGT)을 코드하는 sprT 유전자와 그 하류에 존재하는 두 개의 조절 유전자 rsgtR1 및 sgtR2를 동시에 갖고 있는 재조합 벡터 pWHM3-TR1R2를 S. lividans TK24 및 S. griseus IFO 13350에 도입하여, 트립신의 생산성을 더욱 증대시킬 수 있는 배지를 조사하였다. S. lividans TK24/pWHM3-TR1R2의 경우 배양 5일을 기준으로 R2YE에서 가장 높은 생산성(0.74 unit/mL)을 나타냈고, C5/L. (0.66 unit/mL), Livid (0.08 unit/mL), NDSK(0.06 unit/mL) 순으로 나타났다 S. griseus IFO 13350/pWHM3-TR1R2의 경우에는 전반적으로 배양 7일에 트립신 활성이 가장 높았으며, C5/L (1.518 unit/mL), R2YE(1.284 unit/mL), NDSK (0.932 unit/mL), Livid (0.295 unit/mL) 순으로 나타났다. S. griseus IFO 13350/pWHM3-TR1R2를 C5/L 배지에서 7일간 배양한 배양액으로부터 $25%{\sim}60%$ ammonium sulfate 침전, CM-sepharose 및 Sp-sepharose column chromatography를 통하여 트립신을 고순도로 정제할 수 있었다. 최종 purification fold는 6.5배, 순수 정제된 트립신의 specific activity는 69,252 unit/mg, 회수율은 1.4%이었다.

• 한국수학사학회지
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• 제34권4호
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• pp.117-136
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• 2021

The unit fraction is the basis of the fraction concept and has a role of starting point for understanding the fraction concept. In this study, in terms of the importance of the unit fraction, the teaching methods of the fraction based on the unit fraction were explored. First, it was examined the emerging contexts of the fraction concept and the diversity of its meanings. Second, it was investigated the contents of the unit fraction in Korean and CCSSM's curriculum and textbooks. Lastly, I suggested the teaching methods using the unit fraction in terms of the introduction of fraction, fractional operations, and teaching of problem solving based on the unit fraction.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.6-14
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• 2007

The objective of this research is to comparative LCA(life cycle assessment) between two different model of Electric Motor Unit(EMU).the environmental impact of Aluminum body Electric Motor Unit(EMU) and Stainless Steel(STS) body Electric Motor Unit(EMU). LCA process consists of four steps which are goal, scope definition, life cycle impact analysis(LCIA) and life cycle interpretation. ISO 14044 provides the LCA standard method which can be conducted by using comparative LCA. From the research it is foung that the Aluminium Body Electric Motor Unit (EMU) is 3.6ton heaver than Stainless Steel(STS) body Electric Motor Unit(EMU). The system boundary of both Electric Motor Unit (EMU) are same life span and travel same distance. These both Electric Motor Unit (EMU) has same kind of environmental impact which is maximum Ozone Depletion(OD). During using period of these two models, the Aluminium Body Electric Motor Unit(EMU) has more global warming(GW) effect but Stainless Steel(STS) body Electric Motor Unit(EMU) has more Ozone Depletion(OD) effect. The above result is obtained by using LCA software PASS verson 3.1.3.

• East Asian mathematical journal
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• 제30권4호
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• pp.509-526
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• 2014

The mathematics has moved toward the independence from unit. However, is this tendency also kept up in teaching and learning mathematics? This study starts from this question. We have illuminated this question in respects of a character of unit operation, an essential probability of unit operation and a didactical application of unit. As results, addition and subtraction are operations on identical objects and the result of operation does not also get out of operation's object. On the other hand, multiplication and division are operations on both identical objects and different objects. And the result of operation can generate new unit. We proposed a hypothesis which multiplication and division are transcendental operations from this analysis. The unit operation is not possible essentially. It seems only like unit operation is possible superficially by operational definition on unit. We could discuss on a didactical application of unit from above analysis. And we could deduct implications that the direction of developing mathematic does not necessarily match with the direction of teaching and learning mathematics.