광대역 전력선통신을 위한 채널모델링과 고속데이터 전송특성분석

이영철,Rhee, Young-Chul 한국정보통신학회 2007 한국정보통신학회논문지 Vol.11 No.10

본 논문에서는 복잡한 다중경로를 갖는 가정 전력선에 대한 채널 모델을 분석적 방법으로 전달함수를 분석하였다. 전력선의 배경잡음을 고려한 채널 모델 전달함수를 OFDM 시스템에 적용하였으며, QPSK 및 16-QAM 변조신호에 대한 BER 관계를 분석하였다. 광대역 전력선 통신시스템에 대한 OFDM 변조의 이득 관계를 제시함으로서 OFDM을 적용한 특성 파라미터를 예측할 수 있다. In this paper, an analytic transfer channel modeling function by impulse signal propagation effects in indoor power-line network are analysed. The modeled channel parameters of power line channel including background noise is applied to the OFDM system and we analysis BER for QPSK and 16-QAM modulation signals with simulation. By the representation of gain for OFDM modulation, we can estimate the characteristic parameters of OFDM in Broadband power line communication.

선형계획법에 의한 부로일러의 경제적 영양소 요구량에 관한 연구

이영철,하서현,고용균 ( Yong Chull Rhee,Seo Hyun Ha,Yong Gyun Goh ) 한국축산학회 1980 한국축산학회지 Vol.22 No.5

Two experiments were conducted to investigate the effect of feeding different levels of metabolizable energy and protein diets on growth performances, body composition and gross income of broiler chicks. The results obtained were as follows ; 1. Metabolizable energy level of diet was significantly influenced on body weight and feed efficiency. As the Metabolizable energy level of diet decreased the body weight and feed efficiency decreased proportionately. 2. Male chicks have a higher progressing tendency on body weight and feed efficiency than female chicks. Also, the body weight and feed efficiency were greatly influenced especially by the nutrient level of starter diet. (0-3 weeks) 3. When chicks were fed diet containing high energy value the body fat and abdominal fat pad size of chicks increased. 4. The highest. gross income was marked in the metabolizable energy 3200㎉ treatment of male chicks and in the 3000 ㎉ treatment of female chicks, but the high energy level of diet was not always greater in gross income than low energy level of diet.

닭에 있어서 계분의 사료가치에 관한 연구 ( 제1보 )

이영철,홍병주,강창기 ( Y . C . Rhee,B . J . Hong,C . G . Gang ) 한국축산학회 1974 한국축산학회지 Vol.16 No.3

Two experiments were carried out to determine the chemical composition of dehydrated poultry waste(D.P.W) according to its collecting time after excretion and to determine the nutritive value of D.P.W. as a feed of laying hen. The results were summarized as follows: 1. Protein content of D.P.W. is gradually decreased as the time passes after excretion, the excreta collected within 24 hour showed 31.02% of protein, and the one within 48 hour shoved 16.60%. There was a wide variation in the amount of non-protein nitrogen(NPN), while the true protein is fairly constant. Above 50% of the nitrogen in D.P.W. occurs in the form of NPN. 2. The nitrogen content of D.P.W. was not affected by the dietary protein level, but seemed to be influences significantly by the age of chicken. The highest nitrogen value was obtained from laying hen, although their dietary nitrogen was lower than that of growing chick. 3. 10% D.P.W-A ration showed highest egg production among the treatments and feed efficiency was substantially reduced when 20% of the D.P.W-B was included in the ration which reflected its low metabolizable energy value. The result of this experiment demonstrates that the inclusion of 10% D.P.W. did not interfere with the egg production. 4. There were no differences in egg weight, shell thickness and haugh unit among the treatments. This result proves that the inclusion of D.P.W. did not interfere with egg quality.

병아리에 있어서 필수아미노산 급여수준을 달리할 때 Urea 이용성 시험

이영철,우춘전 ( Young C . Rhee,Chun J . Woo ) 한국축산학회 1975 한국축산학회지 Vol.17 No.4

The experiment was carried out to determine the effects on chick growth, feed efficiency, body composition and plasma free amino acid concentration when chicks were fed various level of essential amino acids. The results obtained were summarized as follows; 1. Urea can be utilized in the chick when the diet containing all the essential amino acids, but when the diets containing limiting amounts of various amino acid were fed to male chick, growth rate and feed consumption decreased gradually. Especially, deficiencies of arginine, isoleucine, phenylalanine+tyrosine or tryptophan impaired growth more badly than that of methionine+cystine, lysine, leucine, histidine, valine or threonine. 2. Percentage body fat was increased and percentage body protein decreased when comparing to control fed reference standard diet, all or one of dietary amino acid was unbalanced. 3. Nitrogen retention, nitrogen efficiency and protein efficiency ratio generally decreased significantly in the treatments fed imbalanced amino acid diet and those treatments showed decreasing growth rate. 4. The composition of free amino acid of plasma proved to be sensitive indicator of dietary amino acid balance. When the experimental diet contained at least one limiting essential amino acid such as methionine+cystine, lysine, arginiae, tryptophan, isoleucine or phenylalanine+tyrosine, the concentration of that limited essential amino acid in the plasma was decreased significantly although the other plasma amino acid showed the trend generally increasing as the result of impaired rate of protein synthesis by the given unbalanced amino acid.

선형계획에 의한 배합사료가 Broiler 에 대한 경제적 영양소요구량에 관한 연구

이영철,하서현 ( Young Chul Rhee,Su Hyun Ha ) 한국축산학회 1976 한국축산학회지 Vol.18 No.5

This experiment was conducted to seek the economic nutrient requirements of practical broiler diet under the circumstances of Korea where high energy ingreidents are scarcely available. Four different least cost diet were formulated using electric computer to contain 3200 ㎉ ME ㎉ per ㎏, 3000 ㎉, 2800 ㎉ and 2600 ㎉ respectively and 2600 ㎉ respectively and other required nutrient equivalent to each ME content. The grass income was the highest for lowest energy diet showing 419 won, 411 won, 382 won and 388 won respectively. This was accomplished by significantly lowered feed cost per ㎏ as the ME content of experimental diet lowered. Although they showed decreased body weight gains and greatly increased feed intakes. This results implies that highest nutrient requirements as showing NRC are not always return highest profit as long as the situations like this experiment are concerned.

부로일러에 대한 타피오카의 사료적 가치시험

이영철,홍병주,리해종 ( Yeong Chul Rhee,Beong Ju Hong,Hae Jong Rhee ) 한국축산학회 1976 한국축산학회지 Vol.18 No.1

Two experiments were conducted using the broiler chick to determine the nutritive value of tapioca root meal in balanced chick rations. The results obtained were summarized as follows: 1. Crude protein and fat contents of tapioca root meal were very low as the value 2.40 and 0.35 percent respectively, on the other hand NFE content (81.24%) and ME value 3.430 ㎉/gm) were observed vary high. 2. When the ration was balanced with respect to protein and amino acids, tapioca root meal, at a level of 20 percent of the broiler chick ration, satisfactorily replaced corn. 3. Supplementation of the high tapioca ration (40%) with 0.15-0.30 percent of methionine and/or 0.10-0.25 percent of Na₂SO₄ largely promoted the growth of broiler. This effects are likely shown that sulfur is involved in cyanide detoxication of tapioca root meal with the formation of thiocyanates and this could have put a greater demand on methionine or Na₂SO₄ to provide sulfur for detoxication of the cyanide.

한우의 번식이 조해되는 요인의 분석연구 ( 강원지역을 중심으로 ) 제1보 빈우의 초산령과 성빈우의 분만간격 및 불임우의발생이 소번식에 미치는 영향

이영철,리해종 ( Y . C . Rhee,H . J . Rhee ) 한국축산학회 1974 한국축산학회지 Vol.16 No.3

This study was an attempt to establish the basic materials for the first parturition age. the parturition interval, ana the sterility, in relation to the factors control lng the increase of the Korean cattle in order to improve the fertilization rate and to supply the meat which is needed in large amount as the result of national income elevation. The results of analyses on the prerequisite of reproductive failure of Korean native cattle were as follow; 1. The fertilization talc of Korean cattle was higher in love land area than in up-land. 2. The fertilization rate of Korean cattle was varied according to its delay of first parturition age, relative length of parturition interval of adult cow and its occurrence frequency of sterile cattle. 3. among the basic factors which decrease breeding ability of Korean cattle, the first was the delay of first parturition, the second was the extension of parturition interval and the third was the state of sterile cattle. 4. The fertilization rate of Korean cattle decreased as the feeding period was longer and such phenomena occurred more markedly in up-land area than in low land. Parturition interval of calving time in feeding period was longer in up-land area than in low land in general and the variation of parturition interval showed similar trend.

고이득, 저잡음지수를 갖는 캐스코드 HBT-MMIC 증폭기 설계

이영철,Rhee Young-Chul 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.3

본 논문에서는 캐스코드 결합 HBT의 이미터와 베이스단에 인덕터를 설치하여 저잡음과 고이득 특성을 동시에 나타내는 MMIC-LNA 증폭기를 설계하였다. 제작된 MMIC 증폭단은 3mA, 2.7V의 바이어스 조건에서 이득은 3.7GHz에서 약 19dB, 잡음지수는 2.7dB를 보였으며, 35dBc의 이미지시호 제거 특성을 보였다. 저 잡음과 고 이득 특성을 갖는 캐스코드 MMIC 증폭단을 이용하여 마이크로파 수신기의 전단부의 설계가 가능함을 보였으며 이미지 제거 필터의 성능을 만족시키기 위하여 능동필터와 함께 설계할 경우 RF 수신 전단부의 완전한 MMIC 설계가 가능함을 알 수 있었다. According to the design concept of microwave front-end, a low noise amplifier block using HBT cascode topology is proposed to provide high gain and low noise figure with low bias current. We has implemented MMIC-LNA with a modified configuration using inductors to show low noise at the emitter and base of cascoded HBT-MMIC amplifier. The measured performance of the designed MMIC-LNA at 3.7GHz are a gain of 19dB, noise figure of 2.7dB and image rejection of 35dBc using a supply of 3mA and 2.7V. We can convinced that cascoded amplifier block to fulfill a high gain, low noise and image rejection if microwave front-end receiver is designed by cascode MMEC-LNA with the active image rejection filter.

닭에 있어서 비단백태질소화합물의 이용성 연구

이영철 ( Yong Chull Rhee ),하서현 ( Seo Hyun Ha ) 한국축산학회 1972 한국축산학회지 Vol.14 No.2

Three experiments were carried out to determine the effect of supplementing chicken diets with non-protein nitrogen as a partial substitute for the protein. The results obtained are summarized as follows: 1. On the day old chick, ten diets supplemented with non-protein nitrogen (NPN) were ineffected and decreased the growth rate compared to the 20% protein control diet. 2. On the 5 weeks old chick, when DAC and urea were fed to supply 3% and 5% protein equivalent (N×6.25) in a 13% and 17% protein diet which met all the amino acid requirements, growth rate and feed efficiency were improved compared to the same diet without the NPN source. 3. The NPN supplement diets decreased egg production compared to the control diet and happened to show more decreased phenomena as the NPN supplement was increased. Especially, urea additive diets produced less eggs than that of DAC.

충수주위농양에 관한 임상적 고찰

이영철(Young-Chul Rhee),김성환(Seong-Hwan Kim),박천규(Chun-Kyu Park) 대한외과학회 1987 Annals of Surgical Treatment and Research Vol.33 No.6