• Bulletin of the Korean Chemical Society
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• 제21권11호
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• pp.1090-1094
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• 2000

A reaction between germanium (Ge) and the ligand, o-chlorophenylfluorone (o-CPF) has been carried out. The reaction sensitive at pH 4.5 in the presence of triton x-100 was selective in the presence of EDTA. The spectral correction technique was ap plied to the analysis of the reaction instead of single wavelength spectrophotometry because the absorption of excess of o-CPF was not negligible. An updated determination of the properties of the Ge(IV)-o-CPF complex is given, which involved the complex ratio, stepwise absorptivity and stability constant of the complex. In present work, the results show that the complex $Ge(o-CPF)_3was$ formed and its cumulative stability constant was 1.09 ${\times}$1016 . For sample analysis, the detection limit of germanium was 0.01 mg/L, and the recoveries were between 96.4% and 102%, with relative standard deviations of less than 6.5%.

• Bulletin of the Korean Chemical Society
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• 제23권7호
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• pp.943-947
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• 2002

The two reactions between iron ion (Fe3+ ) and o-chlorophenylfluorone (o-CPF) and copper ion (Cu2+ ) and o-CPF are sensitive at pH 6 in the presence of Triton X-100. We have determined the formation constants of the complexes by the spectral correction technique. Because of the poor selectivity of o-CPF to metals, the competition coordination of only the iron ion from the Cu-o-CPF complex was found and applied to the selective detection of iron traces by the Selective Competition Coordination Determination (SCCD) approach.The analysis of several samples shows that the relative standard deviations are less than 5.0% and the recovery of iron ions between 94.5% and 106%.

• 미생물학회지
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• 제53권4호
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• pp.286-291
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• 2017

진핵 세포에서 히스톤의 변형은 크로마틴 구조를 조절하는 데에 있어서 중요한 메커니즘이다. Set1 복합체에 의한 히스톤 H3의 네 번째 라이신 잔기(H3K4)에 발생하는 메틸화는 다양하게 잘 알려져 있는 히스톤 변형 중 하나이다. Set1 complex는 H2B의 유비퀴틴화에 의존적으로 발생하는 H3K4 메틸화에 중요하다고 알려진 Swd2를 포함하여 7개의 소단위 단백질을 가지고 있다. Swd2는 Set1의 RNA recognition motif (RRM) 도메인 근처에 결합하여 Set1의 활성을 조절하고, 또 RNA의 3' 말단 형성에 관여하는 CPF (Cleavage and Polyadenylation Factors) 복합체의 구성성분이라고 보고되었다. 최근 보고들에 따르면, 이런 Swd2의 이중적인 기능이 서로 독립적으로 작용하며, Swd2 결실돌연변이 균주가 살지 못하는 이유가 CPF 복합체의 구성성분으로써의 기능 때문이라고 알려져 있다. 본 연구에서 우리는 Swd2가 Set1의 RRM 도메인에 결합하여 Set1의 활성을 조절할 수 있을 뿐만 아니라, Set1의 안정성에도 영향을 줄 수 있음을 발견하였다. 또 우리는 Swd2가 결합할 수 없는 truncated-Set1을 가지고 있는 ${\Delta}swd2$ 돌연변이가 사멸하지 않고 정상적으로 자라는 것을 관찰하였다. 이런 결과들은 Saccharomyces cerevisiae에서 H3K4 메틸화와 RNA 3' 말단 형성과정에서의 Swd2의 이중적인 기능이 서로 독립적인 것이 아님을 제안하다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.1125-1128
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• 1998

A new architecture for high-speed implementation of adaptive decision-feedback equalizer (ADFE) applicable to wide-band digital wireless modems is described. Rather than using conventional two's complement arithmetic, a novel complex-valued filter structure is devised, which is based on redundant binary (RB) arithmetic. The proposed RB complex-valued filter reduces the critical path delay of ADFE, as well as leads to a more compact implementation than conventional methods. Also, the carry-propagation free (CPF) operation of the RB arithmetic enhances its speed. To demonstrate the proposed method, a prototype chip set is designed. They are designed to contain two complexvalued filter taps along with their coefficient updating circuits, and can be cascaded to implement loger filter taps for high bit-rate applications.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.569-571
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• 2003

As a definition of NERC, Available Transfer Capability(ATC) is a measure of the transfer capability remaining in the physical transmission network for the future commercial activity. To calculate ATC, accurate and defensible TTC, CBM and TRM should be calculated in advance. In this paper, we propose a method to quantify TRM using probabilistic load flow based on the method of moment. Generation output, bus voltages, loads, and line outages are considered as complex random variables (CRV) to take into account for uncertainties related to the transmission network conditions. Probability Density Function (PDF) of line flow at the most limiting line is used to quantify TRM with the desired probabilistic margin. Suggested method is compared with the results from conventional CPF method and verified using 24 bus MRTS, and the suggested method based on PLF shows efficiency and flexibility for the quantification of TRM compared with the conventional method.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVII)
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• pp.287-292
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• 2005

The crude polysaccharides(C-CPF, C-CPM, C-CPB) derived from fruiting body, mycelia and mycelia free broth of cordyceps militaris were obtained by ethanol precipitation of hot water extracts. After a batch fermentation of C. militaris was carried out in a 5 L jar vessel, endo-polysaccharide and exo-polysaccharide were obtained. They were demonstrated as the hetero polysaccharides which were composed of glucsose, galactose and mannose by performed with HPAEC(high pH anion exchange chromatography) and conformation of random coil by its complex forming ability with congo red reagent. They were purified by ion exchange (DEAE-cellulose) and gel filtration chromatography. They were monitered by phenol-sulfuric acid method and Bradford method. The NO induction activities of crude polysaccharides and purified polysaccharides derived from mycelia free broth were enhanced rather than LPS(lipo polysaccharide) which was used as a general NO inducer. These effects presumably contibute to the antitumor activities. The homogenieties and molecular weights of polysaccharides were determined by using Sepharose CL-6B. The yield, molecular weights and NO induction activities of C-CPFN Fr.III, C-CPMN Fr.III, C-CPBN Fr.II were 0.387, 0.408 and 0.153, 127 K 210 K and 36 K, 40.79%, 88.72%, and 104.17%, respectively.

• 한국환경과학회지
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• 제30권3호
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• pp.219-234
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• 2021

Industrial emissions, mainly from industrial complexes, are important sources of ambient Volatile Organic Compounds (VOCs). Identification of the significant VOC sources from industrial complexes has practical significance for emission reduction. VOC samples were collected from July 2019 to June 2020. A Positive Matrix Factorization (PMF) receptor model was used to evaluate the VOC sources in the area. Four sources were identified by PMF analysis, including coating-1, coating-2, printing, and vehicle exhaust. The coating-1 source was revealed to have the highest contribution (41.5%), followed by coating-2 (23.9%), printing (23.1%), and vehicle exhaust (11.6%). The source showing the highest contribution was coating emissions, originating from the northwest to southwest of the sample site. It also relates to facilities that produce auto parts. The major components of VOC emissions from the coating facilities were toluene, m,p-xylene, ethylbenzene, o-xylene, and butyl acetate. Industrial emissions should be the top priority to meet the relevant control criteria, followed by vehicular emissions. This study provides a strategy for VOC source apportionment from an industrial complex, which is helpful in the development of targeted control strategies.