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.

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.

식품의 안전성 검사기기

양재승 한국식품영양학회 1997 韓國食品營養學會誌 Vol.10 No.3

먹거리의 국제화에 따라 식품이나 식품원료의 수입이 급증하고 식품규제에 대하여 국제적 조율이 강조되는 등 먹거리를 둘러싼 환경이 크게 변하고 있다. 식품산업도 고품질을 유지하면서 안전성을 확보하는 것이 시급해졌는데 안전성 확보에는 미생물학적, 물리적 위해(이물질 혼입 등)와 함께 식품첨가물, 잔류농약 등의 화학적 위해분석을 빠뜨릴 수 없다. 이들 먹거리의 안전성평가기술의 대표적인 것이 HACCP이다. HACCP절차는 식품가공과 식품저장의 모든 형태에서 식품안전을 확인하는 필수요소이다. 전통적인 최종제품검사가 품질결함을 찾아내기 위한 것이라면 HACCP은 식품의 안전성 결함을 방지하기 위하여 제품계통이나 가공인자 그리고 실제운전에 규제사항을 설계하는 것이다. 본보는 HACCP시스템에 필요한 기기를 중점적으로 요약한 것이다. HACCP procedures are regarded as essential components of modern safety assurance programmes for all forms of food processing and preservation, including irradiation. Control of hazards and classification of hazardous microorganisms and indicator organisms (and related tests) are helpful to establish preventive and practice regulations at each facility. A carefully conceived and well implemented system assure the safety of all products. The HACCP is designed to prevent defects, rather than to detect them as in traditional end-point testing and inspection, as controlling requirements into food formulations, processing parameters and operating practices. This article commentes on some equipments and materials for HACCP system.

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 .

ESR spectroscopy 를 이용한 방사선 조사 계란의 확인

양재승,이선영,남혜선 한국식품위생안전성학회 2000 한국식품위생안전성학회지 Vol.15 No.3

Electron spin resonance (ESR) spectroscopy was used to detect irradiated chicken eggs, to investigate the effect of irradiation dose on the ESR signal intensity and to identify the stability of radicals under 77 days of storage. Raw chicken eggs were irradiated with doses of 0, 0.5, 1, 2, 3 and 5 kGy at room temperature using a Co-60 irradiator. The samples were prepared by separating, drying and powdering shells from the raw eggs. The irradiated chicken egg shells presented an asymmetric absorption in shape at g₁=2.0023±0.00004 and g₂=1.9979±0.00005, different from the non-irradiated ones. The strength of the ESR signal increased linearly with the applied doses (to 5 kGy). The intensity of the ESR signals after irradiation were stable even after 77-day of storage at 5℃ and/or room temperature.

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.

Jacket 행렬의 성질과 특성

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

양면을 뒤집어 입을 수 있는 Jacket처럼, 내부 및 외부 양 쪽 모두 호환이 가능한 행렬을 Jacket 행렬이라 한 다. element-wise inverse와 block-wise inverse 과정을 통해 Jacket 행렬은 안 쪽 요소와 바깥쪽 요소 모두를 가진 다. 이 개념은 1989년에 저자 중 한 명인 이문호 교수에 의해 이루어진 것으로서, 2000년에는 최종적으로 Jacket 행렬 이라 부르게 되었다. 이것은 잘 알려진 Hadamard 행렬의 가장 일반적인 확장으로서, 직교와 비직교 행렬에 대한 성질 을 포함하고 있다. Jacket 행렬은 정보 및 통신 분야 이론의 많은 문제들을 해석하는데 이용된다. 본 논문에서는 Jacket 행렬의 성질과 특성, 예를 들어 determinants와 eigenvalues, Kronecker product에 대해서 다룬다. 이 연산들 은 신호 처리와 직교 코드 디자인에 매우 유용하다. 또한, 본 논문은 복잡성이 낮은 매우 간단한 수학적 모델을 통해 이들의 유용성을 계산한 결과를 제시한다. As a reversible Jacket is having the compatibility of two sided wearing, the matrix that both the inside and the outside are compatible is called Jacket matrix, and the matrix is having both inside and outside by the processes of element-wise inverse and block-wise inverse. This concept had been completed by one of the authors Moon Ho Lee in 1989, and finally that resultant matrix has been christened as Jacket matrix, in 2000. This is the most generalized extension of the well known Hadamard matrices, which includes both orthogonal and non-orthogonal matrices. This matrix addresses many problems in information and communication theories. we investigate the properties of the Jacket matrix, i.e. determinants, eigenvalues, and kronecker product. These computations are very useful for signal processing and orthogonal codes design. In our proposal, we provide some results to calculate these values by using a very simple mathematical model with less complexity.