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국균을 달리한 탁주 양조 중 유리아미노산 및 유기산의 소장
이명환,이원경,김정림 한국농화학회 1987 Applied Biological Chemistry (Appl Biol Chem) Vol.30 No.4
Takju, a Korean traditional rice wine, was prepared using Koji and Nuluk which were inoculated with single or combination culture of Aspergillus niger, Aspergillus shirousamii, and Aspergillus kawachii to investigate changes in mineral, amino acid and organic acid during fermentation. The mineral content showed a range of 1.50∼15.20ppm for Ca, 0.22∼0.25ppm for Cu, 1.60∼2.10ppm for Fe, 0.17∼0.55ppm for Mn, 0.68∼1.00ppm for Zn, 3.00∼40.50ppm for K, 5.25∼19.50 for Mg, 1.43∼2.95ppm for Na, and 3.00∼63.0ppm for P. It has been found that Takju had 16 kinds of amino acid including aspartic acid. A. niger Nuluk showed the highest contents in total amino acids, while A. kawachii Koji was the lowest in amino acids. The major amino acids were glutamic acid, alanine, leucine, and phenylalanine. The order of organic acids from the highest content in Takju were citric acid$gt; tartaric acid$gt; pyruvic acid$gt; malic acid$gt; lactic acid $gt; acetic acid.
가중치 함수를 이용한 위상 검출 알고리즘과 위상 추적 루프의 설계
이명환 한국통신학회 1998 韓國通信學會論文誌 Vol.23 No.9
In the grand alliance (GA) HDTV receiver, a coherent detection is empolyed for coherent demodulation of vestigial side-band (VSB) signal by using frequency and phaselocked loop(FPLL) operating on the pilot carrier. Additional phase tracking loop (PTL) employed to track out phase noise that has not been removed by the FPLL in theGA system. In this paper, we propose an algorithm for phase detection which utilizes a weighting function. The simplest implementation of the proposed algorithm using te sign of the Q channel component can be tractable by imposing a phase detection gain to the loop gain. It is obserbed that the propsoed algorithm has a robust characteristic against the performance of the digital filters used for Q channel estimation. A second goal of this paper is to introduce a gain control algorithm for the PTL in order to provide an effective implementation of the proposed phase detection algorithm. And we design the PTL through the realization of the simplified digital filter for H/W reduction. The proposed algorithms and the designed PTL are evaluated by computer simulation. In spite of using the simplified H/W structure, simulation results show that the proposed algorithms outperform the coventional PTL algorithms in the phase detection and tracking performance.
직접시퀀스 확산대역 시스템의 빠른 포착을 위한 새로운 알고리듬
이명환,이재홍 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.7
We have proposed a new fast serial serch algorithm and a receiver for direct-sequence spead-spectrum acquisition systems and analyzed its perfoemance. This algorithm achieves faster acquisition by more than two times that of existing algorithm. We have derived equations of the mean acquistion time by using moment generating function and direct approach, and presented numerical results.
모직물을 포염에서 melange염색 효과를 나타내기 위한 기술개발과 응용에 관한 연구
이명환,정영진,최해욱,이언필 한국염색가공학회 1998 韓國染色加工學會誌 Vol.10 No.3
The dyeing properties of modified wool were examined with a series of acid, reactive and cationic dyes. Cationic agent and sulphamic acid were applied to wool fabric for dye assist and resist effect. Wool pretreated with cationic agent showed better uptake of acid and reactive dyes than did untreated wool. On the other hand, the dyeing behavior of wool pretreated with sulphamic acid was found as follows : Acid dyes were poorly resisted with a hydrophobic mechanism but acid dyes were strongly resisted with a hydrophilic mechanism. Reactive dyes were also found to be effectively resisted. Sulphamic acid introduces sulphonate group into wool's structure, it has increased better uptake of cationic dyes than untreated wool. The degree of differential uptake depends on the level of pretreatment and produces a variety of tone-on-tone and multicolor effect in piece dyeing.
이명환,이인모,김상균,Lee, Myung Whan,Lee, In Mo,Kim, Sang Gyun 대한토목학회 1993 대한토목학회논문집 Vol.13 No.5
일반 PC 말뚝과는 달리 제작시 실리카(silica) 재료를 사용하고 증기양생후 고온, 고압의 추가양생(autoclave curing) 실시함으로써 말뚝자체의 강성을 높인 PHC 말뚝의 항타시공성과 지지력 특성을 파동이론에 근거한 수치해석과 실재현장에서의 항타기록 및 재하시험을 통하여 파악하였다. 임의의 지반조건에 대하여 항타장비에 따른 수치해석과 현장시험의 결과는 PHC 말뚝이 PC 말뚝에 비해 말뚝의 재질강도가 60% 정도 크므로 항타장비에 의해서 발휘되는 타격에너지에 대해 보다 큰 저항력을 가지기 때문에 설계지지력을 보다 크게 얻을 수 있으며 항타장비의 선정에 있어서도 보다 큰 효율을 지닌 장비의 선정이 가능하여 경제적인 항타작업을 수행하는데 유리함을 보였다. The main characteristics of PHC piles is that silica material and autoclave curing technique are used when manufacturing to have higher strength than PC piles. In this paper, pile drivability and bearing capacity characteristics of the PHC piles are studied through numerical analysis based on wave propagation theory, driving records and pile load tests in situ. It is found that we can have higher bearing capacity by using the PHC piles rather than the PC on condition that the most effective driving equipment is chosen when driving the pile. In other words, since the PHC piles have higher resistance to driving energy, the heavier ram can be used in the driving process, which results in the higher bearing capacity.