• 한국의사학회지
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• 제23권2호
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• pp.15-22
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• 2010

Currently, in Korea, all lengths are written in "meter" unit, and the non-statutory measuring units are banned for use. However, in some fields, traditional measuring units are widely used with necessary modifications, and people in such fields raise varying arguments on conversion to "meter" unit. This research examines traditional measuring units from historical and cultural viewpoints, and provides suggestions on how to improve consistency and standardization for more accurate and effective exchangeof scientific opinions.

• 대한소아치과학회지
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• 제31권2호
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• pp.273-279
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• 2004

최근에 소개된 single high-intensity LED 중합기는 이전의 LED 중합기에 비해 높은 광도를 가지며 짧은 중합시간에 적절한 물성을 가질 수 있다고 한다. 본 연구는 single high-intensity LED 중합기의 중합성능을 평가하기 위하여 거리에 따른 중합도를 조사하였다. Mylar strip사이에 복합레진(Filtek Z250)을 넣고 압접시켜 만든 얇은 필름형 시편을 LED 중합기(Elipar Freelight 2, 10초), 플라스마 중합기(Flipo, 6초)와 할로겐 중합기 (XL3000, 20초)를 사용해 0mm, 2mm, 4mm, 6mm에서 광도를 측정하고 중합시켰다. 중합된 시편을 Fourier Transform Infrared Spectrometer(FTIR)를 이용해 중합도를 측정한 후 다음과 같은 결론을 얻었다. 1. 모든 중합기에서 거리가 증가할수록 유의하게 광도가 감소하였으며 LED중합기의 경우 6mm에서 다른 중합기에 비해 가장 많은 광도 감소율을 보였다(p<0.05). 2. 모든 중합기에서 거리가 증가함에 따라 4mm까지는 중합도가 감소하였지만 유의한 차이는 보이지 않았다(p>0.05). 하지만 4mm와 6mm사이에서는 모든 중합기에서 유의하게 감소하였다(p<0.05). 3. 각 거리에 따른 중합기간의 중합도 차이는 0mm, 2mm, 4 mm에서 LED중합기가 다른 중합기보다 유의하게 높은 중합도를 보였으며 (p<0.05) 플라스마 중합기와 할로겐 중합기 사이에서는 유의한 차이가 없었다. 하지만 6 mm에서는 모든 중합기 사이에 유의한 차이를 보이지 않았다(p>0.05).

• Bulletin of the Korean Chemical Society
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• 제25권12호
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• pp.1893-1897
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• 2004

Hydrodynamic simulations of mesoscopic solvent have been performed by multi-particle collision algorithm in a real dimensional system without and with the random shifting of the grid. A systematic conversion of the dimensionless units to a real dimensional system was confirmed by jump rates of solvent particles. Speed distributions of solvent particles obtained from the simulations agreed very well with the Maxwell-Boltzmann distributions. Solvent viscosities obtained from the simulations and from the conversion of units are exactly the same which confirmed the correct conversion of the units once again. The calculation of the friction coefficient of a massive Brownian particle in a mesoscopic solvent as a function of Brownian particle diameter was examined as an example.

• 통합자연과학논문집
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• 제16권4호
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• pp.133-138
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• 2023

After the SI system of units was adopted as an international system of units, Korea made a lot of efforts such as administrative and educational guidance on the traditional units that had been used so far. In addition, from July 1, 2007, the government has cracked down on the denotation of non-statutory units of measurement as standard units or auxiliary units in commercial transactions. However, non-statutory weighing units are still used in other forms. It is believed that this is because non-statutory units (= our traditional units) are permeated in our lives and are convenient to use. The general public still finds it difficult to use and mark the SI system of units correctly. This is not a problem unique to Korea. However, if you look at the books that are currently used as university physics textbooks, the SI system of units and the non-legal units of other countries are marked in such a way that they can be accurately converted. Only the traditional units of our country are disappearing under the pretext of unit unification. Accordingly, we propose that our units should not be neglected in university education, but should be labeled together. The purpose of this study is to raise the necessity of reorganizing the unit conversion between the SI unit system and the traditional life improvement unit, which continues to be the convenience of life, and applying it in university physics education to enable the conversion with our traditional unit, and to educate the importance of the meaning and function of our traditional unit.

• Journal of Microbiology and Biotechnology
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• 제1권1호
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• pp.63-69
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• 1991

Performance of column type bioreactor packed with immobilized cyclodextrin glucanotransferase (CGTase) on chitosan and Amberite IRA 900 was evaluated for cyclodextrin(CD) production. For CGTase immobilized on chitosan, the maximum CD conversion yield of 42% was achieved at the range of 88-168 units of immobilizied CGTase per gram of chitosan, retention time of 0.3 hr, and from 5.0% (w/v) of partially cyclized soluble starch. On the other hand, for CGTase immobilized on Amberite IRA 900, the maximum conversion yield of 40% was obtained at the range of 3.6-11.0 units of immobilized CGTase per gram of carrier and retention time of 1.2 hr from 5.0% of substrate. Above CD conversion yields are almost identical level with that can be obtained with soluble CGTase of 47%. The productivities of bioreactor packed with immobilized CGTase were 17.0g of CD/lㆍhr for amberite IRA 900 and 15.5g of CD/lㆍhr for chitosan. The partially cyclized starch with soluble CGTase were more suitable as substrate to achieve better CD conversion yield, and 5% (w/v) of partially cyclized soluble starch containing 10% (w/w) of CD was found to be most suitable to obtain maximum CD conversion yield.

• 응용통계연구
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• 제20권1호
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• pp.11-22
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• 2007

통계청에서는 서비스업 총 조사를 매 5년을 주기로 실시하는데, 가장 최근의 서비스 산업 총 조사는 2001년에 실시되었다. 본 연구에서는 2001년에 조사된 사업체별 통계를 기업의 규모에 따른 기업체별 통계로 전환하여, 서비스 산업에서 중소기업이 차지하는 비중을 추정하는 새로운 방법을 제안하고자 한다. 이를 통해 중소기업의 전반적인 현황을 파악하는데 많은 도움이 되리라 기대한다.

• 대한한의학방제학회지
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• 제24권4호
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• pp.335-351
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• 2016

Objective : This study was done to clarify ambiguous non-standard weight and measuring units in medical classics. Methods : Using medical classics and research dissertations, we studied the basic definitions of weight and measuring units and the types of non-standard weight and measuring units. We compared non-standard weight and measuring units in the reference literatures, to determine the dose of herbs in the prescriptions. Results : There are three types of units in non-standard weight and measuring units. These are 'Quantity measuring unit', 'Resembrance measuring unit', and 'Eye measuring unit'. And we found historical efforts and progresses for proper ways to convert non-standard weight and measuring units to standard weight and measuring units. Conclusions : This research will be the basic data for the standardization of prescriptions. Additional study was still required for precise weighing and measuring in Korean medicine and pharmacy.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1224-1225
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• 2011

This paper proposes a novel soft-switching interleaved boost converter composed of two shunted elementary PFC boost conversion units and an auxiliary inductor. This converter is able to turn on both the active power switches at zero voltage to reduce their switching losses and evidently raise the conversion efficiency and power factor. Since the two parallel-operated elementary boost units are identical, operation analysis and design for the converter module becomes quite simple. A laboratory test circuit is built, and the circuit operation shows satisfactory agreement with the theoretical analysis. The performance of the proposed PFC rectifier was evaluated on an experimental 300[W] PFC prototype.

• 전기전자학회논문지
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• 제14권2호
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• pp.76-81
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• 2010

모바일 CPU의 성능이 향상됨에 따라 전용 하드웨어의 필요성이 줄어 들고 있다. 그러나 아직까지 모바일 CPU의 성능은 한계가 있다. 이러한 제약 조건을 병렬처리와 실수 연산이 뛰어난 GP-GPU(General-Purpose computing on Graphics Processing Units)를 이용함으로써 다른 전용 하드웨어의 추가 없이 성능을 향상 시킬 수 있다. 본 논문에서는 모바일 환경에 적합하게 설계된 GP-GPU를 이용하여 H.264 디코더의 Inverse Quantization, Inverse DCT, Color Space Conversion 모듈을 구현하였다. G-PGPU를 이용한 전체 시스템 동작 시 40%의 성능 향상이 있었다.

• 대한간호학회지
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• 제41권3호
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• pp.302-312
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• 2011

Purpose: The purpose of this study was to develop a resource-based relative value scale (RBRVS) and its conversion factor for advanced nursing practices carried out by critical care nurse practitioners (CCNP) in intensive care units. Methods: The methodology was developed by calculating CCNP's RBRVS for 32 advanced nursing services based on CCNP's workload and time spent in the context of national health insurance. A cost analysis was performed to estimate the conversion factor of CCNP's RBRVS. The share of CCNP's contribution to fee-for-service in intensive care units was also analyzed. Results: Calculation of the RBRVS of 32 advanced nursing practices showed a range of points from 100.0 to 1,181.4 and an average of 296.1 points. The relevant conversion factor for advanced nursing practices in CCNP were estimated at 37.3-48.4 won. The contribution rate of CCNP's advanced nursing practices in the relative value scale of the national health insurance was estimated at 0.1-31.3%. Conclusion: Measuring the economic value of advanced nursing services will be a basis for esta-blishing a reimbursement system for CCNP's practices and thus encourage a social demand for advanced nurse practitioners.