실험동물 사료의 처리방법별 살균효과와 성분변화

양재승,조한옥,권중호,변명우 한국농화학회 1987 Applied Biological Chemistry (Appl Biol Chem) Vol.30 No.2

The usual sterilization methods such as fumigation and autoclaving of laboratory rodent diet was compared with a new irradiation treatment in the point of sterilization effect and physico-chemical quality. Under the treatments of 10∼20 kGy r-irradiation and autoclaving at 121℃ for 20 min, total microorganisms were eliminated but ethylene oxide fumigation was insufficient to destory them. Total amino acid content was reduced about 5% in 20 kGy radiation treatment compared with control, while in the ethylene oxide fumigation and the autoclaving, the reducing rate was markedly great as 15% and 20%, respectively. Total sugar and mineral contents were not significantly different among treatment among treatment groups. TBA values were increased in all treatments. The pH of irradiated group was stable in comparison with that of ethylene oxide. In the treatments of ethylene oxide and especially autoclaving, overall appearance was decreased to a great extent as a result of decreasing lightness and increasing redness.

MIMO 채널 대각화 : 선형 검출 ZF, MMSE

양재승,신태철,이문호 한국인터넷방송통신학회 2016 한국인터넷방송통신학회 논문지 Vol.16 No.1

공간다중화 방식을 사용하는 MIMO 시스템은 다이버시티 기법을 사용하는 MIMO 시스템과 비교할 때 높은 전송률을 달성하지만 다이버시티 이득이 낮아 데이터 전송 신뢰도를 높이기 위하여 MIMO 수신단에서 공간정보스트림을 분리해야한다. 본 논문에서는 격자부호에 의한 채널 용량 검출 기법, 사용자 3인인 간섭채널과 선형검출기법인 ZF(Zero Forcing)와 MMSE(Minimum Mean Square Error) 검파 기법을 비교했다. 이때 채널은 Diagonal 채널이 된다. 즉, Diagonal 채널은 로 역행렬이 element-wise inverse로 Jacket 행렬의 성질을 만족함을 확인했다. Compared to the MIMO system using the spatial multiplexing methods and the MIMO system using the diversity scheme achieved a high rate, but the lower the diversity gain to improve the data transmission reliability should separate the spatial stream at the MIMO receiver. In this paper, we compared Channel capacity detection methods with the Lattice code, the 3-user interference channel and linear channel interference detection methods ZF (Zero Forcing) and MMSE (Minimum Mean Square Error) detection methods. The channel is a Diagonal channel. In other words, Diagonal channel is confirmed by the inverse matrix satisfies the properties of Jacket are element-wise inverse to .

Jacket Matrix in Hyperbola

양재승,박주용,이문호 한국인터넷방송통신학회 2015 한국인터넷방송통신학회 논문지 Vol.15 No.3

Jacket matrices[2][8] which are defined to be m ×m matrices † 1 Tik J = ⎡⎣J− ⎤⎦ over a Galois field F with theproperty †m JJ =mI , J † is the transpose matrix of element-wise inverse of J , i.e., † 1 Tik J = ⎡⎣J− ⎤⎦ , were introducedby Lee in 1984 and are used for Digital Signal Processing and Coding theory. This paper presents some squarematrices 2 n A which can be eigenvalue decomposed by Jacket matrices. Specially, 2 A and its extension 3 A canbe used for modifying the properties of hyperbola and hyperboloid, respectively. Specially, when the hyperbola has times transformation, the final matrices 2A n can be easily calculated by employing the EVD[7] of matrices2 A . The ideas that we will develop here have applications in computer graphics and used in many importantnumerical algorithms.

Blind Channel Estimation based on Hadamard Matrix Interstream Transmission for Multi-Cell MIMO Networks

양재승,모하마드 아부 하니프,박주용,이문호 한국인터넷방송통신학회 2015 한국인터넷방송통신학회 논문지 Vol.15 No.4

In this paper, we introduce a Hadamard matrix interstream transmission based blind channel estimationfor multi-cells multiple-input and multiple-output (MIMO) networks. The proposed scheme is based on anetwork with mobile stations (MS) which are deployed with multi cells. We assume that the MS have thesignals from both cells. The signal from near cell are considered as desired signal and the signals from theother cells are interference signal. Since the channel is blind, so that we transmit Hadamard matrix pattern pilotstream to estimate the channel; that gives easier and fast channel estimation for large scale MIMO channel. Thecomputation of Hadamard based system takes only complex additions, and thus the complexity of which ismuch lower than the scheme with Fourier transform since complex multiplications are not needed. Thenumerical analysis will give perfection of proposed channel estimation.

방사선 조사식품의 검출기법

양재승 한국식품위생안전성학회 1997 한국식품위생안전성학회지 Vol.12 No.2

Progress in commercialization of the irradiation process, greater international trade in irradiated food, differing regulations relating to use of the technology in many countries, and consumer demand for clear labeling of irradiated food highlighted the need for tests that could be applied to the food itself. Scientists have had to focus on identifying and isolating the minute changes caused in the component food molecules by the process. A number of investigators have reviewed the changes occurring in food after irradiation, detecting and measuring the effects of irradiation. The Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture organised a coordinated program on analytical detection methods in irradiation treatment of food (ADMIT) which promoted cooperation in this area and sponsored collaborative testing of some of the most promising methods.

효소전극을 이용한 L-lysine의 연속측정

양재승,Yang, Jae-Seung 생화학분자생물학회 1986 한국생화학회지 Vol.19 No.1

10 IU L-lysine-$\alpha$-oxidase와 젤라틴막 그리고 소형 산소전극으로부터 효소전극을 만들었다. 이의 반응은 효소막이 얇을수록 빨리 일어났으며 $120\;{\mu}m$의 효소전극에서는 1 mM까지 거의 직선적으로 증가하였다. 최대반응속도는 리신의 농도와 관계가 있어 최대 반응속도-리신농도로 표시한 표준곡선은 포물선으로 되었으며 $V_m$ app.는 6.0 mV/sec이었고 $K_m$ app.는 0.7 mM이었다. 이상의 방법으로 리신 농도를 연속흐름계에서 측정하였다. 최적유속은 3 cc/min이었으며 최대반응률은 반응후 12초 이내에 나타났다. 최적 효소농도는 10 IU이었고 최적 pH는 8.7이었다. 최적 이온강도는 0.05 mM이었으며 온도가 $1^{\circ}C$ 증가함에 따라 약 3%의 반응오차를 가져왔다. 시료는 시간당 60회 이상을 측정할 수 있었으며 효소막 하나로 3,000회 이상 반복 측정할 수 있었다. The enzyme electrode was fablicated by combining 10 IU L-lysine-$\alpha$-oxidase, gelatine membrane and $pO_2$ micro electrode. The reaction was fast as the membrane was thin. It was increased the reaction linearly until 1 mM in $120\;{\mu}m$-membrane. The maximum reaction rate was correlated with L-lysine concentration. The standard curve was hyperbolic so as to $V_m$ app. being 6.0 mV/sec and $K_m$ app. being 0.7 mM L-lysine. L-lysine was measured with the continuous flow system. Optimal flow rate was 3 cc/min and the maximum reaction rate was appeared within 12 seconds after reaction. Optimal enzyme concentration was 10 IU, optimal pH was 8.7 and optimal ionic strength was 0.05 mM. It was about 3% reaction error for the temperature increase of $1^{\circ}C$. Sample frequency up to 60/hour could be achieved. With one membrane, more than 3,000 determinations could be performed.

다중 셀 MIMO 네트워크를 위한 Hadamard 행렬 Interstream 전송 기반 Blind 채널 추정

양재승,모하마드 아부 하니프,박주용,이문호 한국인터넷방송통신학회 2015 한국인터넷방송통신학회 논문지 Vol.15 No.4

본 논문에서는 다중 셀 MIMO (multiple-input and multiple-output) 네트워크를 위한 Hadamard 행렬 인터스트 림 (interstream) 전송기반 blind 채널추정을 소개한다. 제안 방법은 다중 셀로 된 이동 단말 네트워크를 기반으로 연구 된다. MS (mobile station) 는 양 셀로부터 신호를 받는 것으로 가정한다. 가까운 셀로부터 받은 신호는 원하는 신호 로 간주되고, 다른 셀로부터 받은 신호는 간섭신호로 간주된다. 채널은 blind이기 때문에 채널을 추정하기 위해 Hadamard 행렬 패턴의 파일럿 (pilot) 스트림 (stream) 을 전송하면, 대규모 MIMO 채널에 대해 보다 쉽고 빠른 채널 추정이 가능하게 된다. Hadamard 행렬 기반시스템의 계산은 오직 복소 가산 (complex addition) 만 필요하기 때문에, 복소 승산 (complex multiplication) 이 필요한 Fourier 변환을 이용한 방법보다 복잡도가 훨씬 줄어든다. 수치적 분석 을 통해 본 결과 제안한 방법이 완벽함을 보여준다. In this paper, we introduce a Hadamard matrix interstream transmission based blind channel estimation for multi-cells multiple-input and multiple-output (MIMO) networks. The proposed scheme is based on a network with mobile stations (MS) which are deployed with multi cells. We assume that the MS have the signals from both cells. The signal from near cell are considered as desired signal and the signals from the other cells are interference signal. Since the channel is blind, so that we transmit Hadamard matrix pattern pilot stream to estimate the channel; that gives easier and fast channel estimation for large scale MIMO channel. The computation of Hadamard based system takes only complex additions, and thus the complexity of which is much lower than the scheme with Fourier transform since complex multiplications are not needed. The numerical analysis will give perfection of proposed channel estimation.

Properties and Characteristics of Jacket Matrices

양재승,박주용,이문호 한국인터넷방송통신학회 2015 한국인터넷방송통신학회 논문지 Vol.15 No.3

As a reversible Jacket is having the compatibility of two sided wearing, the matrix that both the insideand the outside are compatible is called Jacket matrix, and the matrix is having both inside and outside by theprocesses of element-wise inverse and block-wise inverse. This concept had been completed by one of the authorsMoon Ho Lee in 1989, and finally that resultant matrix has been christened as Jacket matrix, in 2000. This is themost generalized extension of the well known Hadamard matrices, which includes both orthogonal andnon-orthogonal matrices. This matrix addresses many problems in information and communication theories. weinvestigate the properties of the Jacket matrix, i.e. determinants, eigenvalues, and kronecker product. Thesecomputations are very useful for signal processing and orthogonal codes design. In our proposal, we provide someresults to calculate these values by using a very simple mathematical model with less complexity.

Application of Viscometric Method for the Detection of Irradiated Black and White Pepper

양재승,장규섭,이상덕 한국식품위생안전성학회 2000 한국식품위생안전성학회지 Vol.15 No.2

A study was carried out to establish a detection method for irradiated black and white pepper. Samples were packed in polyethylene bags and irradiated with 2.5, 5, 7.5, 10 and 15 kGy using a Co-60 irradiator. The samples were suspended in water, and alkalized with sodium hydroxide solution. Apparent viscosity was determined after heat gelatinization using a Brookfield DV-III rotation viscometer at 30 with 30, 60, 90, 120, 150, 180, and 210 rpm. Means and standard deviations of the viscosities of all samples decreased by increasing the stirring speeds. The viscosities increased in all samples by increasing the concentration. Regression expressions and coefficients of viscosity which decreased with increasing irradiation dose of 10% and 13% black pepper, and 7% and 10% white pepper were 0.9531 (y=-131.29x+1,769.0), 0.9725 (y=-351.33x+4,036.0), 0.9731 (y=2,208.0e^(-0.3546x)), and 0.9959 (y=5,116.0e^(0.2887x)), respectively, at 120 rpm. This trend was similar for all stirring speeds. These results suggest that the detection of irradiated black and white pepper at various doses is possible by the viscometric method.

감마선 조사된 벼와 찰벼의 검지를 위한 발아특성 비교

양재승,김경은,오경남 한국식품위생안전성학회 2001 한국식품위생안전성학회지 Vol.16 No.1

The germination test was used to detect biological changes in irradiated rice and glutenous rice at low doses. Grains were irradiated at below 0.5 kGy, husked and placed on distilled water moistend filter paper in a covered petri-dish. A germination test of 20 grains was carried out at room temperature for 5 days. The shoots and roots of non-irradiated rites grew well in comparison with those of irradiated rites above 0.3 kGy. The roots of rites were more sensitive to irradiation than the shoots, and the growth of roots was significantly decreased with the increasing doses. In glutinous rites, the growth of shoots and roots was retarded by irradiation at 0.2 kGy or more after 3rd days. We concluded that if the shoot or root length is 10 mm or longer within 5 day, the rites and glutinous rites are identified as non-irradiated.