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Goran T. Djordjevic,Ivan B. Djordjevic,Predrag N. Ivanis 한국전자통신연구원 2009 ETRI Journal Vol.31 No.5
In this letter, we study the influence of receiver imperfections on bit error rate (BER) degradations in detecting low-density parity-check coded multilevel phase-shift keying signals transmitted over a Rician fading channel. Based on the analytical system model which we previously developed using Monte Carlo simulations, we determine the BER degradations caused by the simultaneous influences of stochastic phase error, quadrature error, in-phase-quadrature mismatch, and the fading severity.
RIGHT AND LEFT FREDHOLM OPERATOR MATRICES
Djordjevic, Dragan S.,Kolundzija, Milica Z. Korean Mathematical Society 2013 대한수학회보 Vol.50 No.3
We consider right and left Fredholm operator matrices of the form $\[\array{A&C\\T&S}\]$, which are linear and bounded on the Banach space $Z=X{\oplus}Y$.
Biochemical Properties of the Fresh and Frozen Black Currants and Juices
Boban Djordjevic,Katarina S ˇ avikin,Gordana Zdunic,Teodora Jankovic,Todor Vulic,Dejan Pljevljakusˇic,Cedo Oparnica 한국식품영양과학회 2013 Journal of medicinal food Vol.16 No.1
Thirteen black currant varieties (Ribes nigrum L.) cultured in Serbia were characterized for their pomological properties and chemical composition (total phenolics, total anthocyanins, anthocyanin aglycones, sugars, and vitamin C). The average amount of vitamin C varied from 122.4 to 193.2 mg/100 g fresh weight (FW), while concentration of invert sugars ranged from 6.3% to 11.1%. The highest amounts of total phenolics and anthocyanins were detected in variety Ometa (278.9 mg of gallic acid equivalents per 100 g of FW [mg GAE/100 g FW] and 135.4 mg/100 g, respectively). Quantitative analyses of anthocyanin aglycones in berries were performed using high-performance liquid chromatography, and delphinidin was found to be dominant compound in 11 varieties. Total phenolics and anthocyanins contents decreased during the processing of berry fruits to juices, and the reduction of anthocyanins was more pronounced, 12%–80%. The radical scavenging activity of black currant juices was investigated by 1,1-diphenyl-2-picrylhydrazyl, and the IC50 value ranged from 1.9 to 4.0 mg/mL. Our results also showed that freezing as a way of preservation and storage could save important phytochemicals and health benefits of berries and berry juices. The amount of total phenolics in berries increased during 1 year of storage by 46.09%–171.76% and in juices by even 107.58%, while the amount of total anthocyanins in berries and juices decrease by 5.63%–52.76% and 13.04%–36.82%, respectively.
Right and left Fredholm operator matrices
Dragan S. Djordjevic,Milica Z. Kolundzija 대한수학회 2013 대한수학회보 Vol.50 No.3
We consider right and left Fredholm operator matrices of the form [A C T S], which are linear and bounded on the Banach space Z = X Y .
레이저 여기 램파를 이용한 항공기 판재 접합부의 비접촉식 초음파 검사
장경영,김홍준,Ceringlia, Donatella,Djordjevic, Boro 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.2
접착제와 리벳으로 접합된 항공기 판재의 접합부는 접합 불량, 크랙, 피로 결함이나 부식등에 의해 손상되고 열화될 수 있으며 이런 결함을 전 영역에 걸쳐서 신속하고도 신뢰성 있게 검사하는 것은 항공기 안전을 위해 매우 중요하다. 본 연구에서는 이를 위해 항공기용 알루미늄 판재의 랩 스플라이스 접합 연결부의 접합 품질을 비접촉 방식으로 수행할 수 있는 초음파 비파괴 평가법을 제안한다. 여기서는 레이저를 이용해 램파를 발생시키고 비접촉식 트랜스듀서(공기정합 용량형 트랜스듀서)를 이용해 피치-캐치 방식으로 검사한다. 레이저 소스로는 Q-스위치된 Nd:YAG레이저가 이용되며 배열 형태의 직선 슬릿을 갖는 마스크를 이용해 특정 모드의 램파를 발생시켜 이용하였다. 접합부의 한 쪽에서 발생된 레이저 여기 초음파는 판을 따라 전파하여 접합부를 지나 반대편에서 수신되고 수신된 신호의 특성과 접합부의 품질과의 관련성을 조사하였다. Due to aging, adhesively bonded and riveted aircraft lap joints can contain disbands, crack around rivet holes, fatigue induced flaws, and corrosion. It is required for the safety of aircraft to inspect these defects through the whole region of joint in rapid speed. Bond quality of adhesively bonded and riveted aluminum lap splice joints is investigated using non-contact remote ultrasonic nondestructive evaluation(NDE). Non-contact ultrasonic tests are performed using laser generation and air-coupled transducer detection. A Q-switched Nd:YAG laser and a periodic transmission mask are used to generate a selected Lamb mode. The Lamb wave is generated on one side of the lap splice joint, propagates along the plate, interacts with the joint and is detected on the other side by a micromachined air-coupled capacitance transducer. Analysis of recorded signals allows to evaluate the condition of the bond.
WEIGHTED MOORE-PENROSE INVERTIBLE AND WEIGHTED EP BANACH ALGEBRA ELEMENTS
Boasso, Enrico,Djordjevic, Dragan S.,Mosic, Dijana Korean Mathematical Society 2013 대한수학회지 Vol.50 No.6
The weighted Moore-Penrose inverse will be introduced and studied in the context of Banach algebras. In addition, weighted EP Banach algebra elements will be characterized. The Banach space operator case will be also considered.
Weighted Moore-Penrose invertible and weighted EP Banach algebra elements
Enrico Boasso,Dragan S. Djordjevic,Dijana Mosić 대한수학회 2013 대한수학회지 Vol.50 No.6
The weighted Moore-Penrose inverse will be introduced and studied in thecontext of Banach algebras. In addition, weighted EP Banach algebra elements will be characterized. The Banach space operator case will be also considered.
ON THE RANGE CLOSURE OF AN ELEMENTARY OPERATOR
Canavati Jose Angel,Djordjevic Slavisa V.,Duggal Bhagwati Prasad Korean Mathematical Society 2006 대한수학회보 Vol.43 No.4
Let $A, B{\in}B(H)$ be Hilbert space contractions, and let ${\Delta}_{AB}$ be the elementary operator ${\Delta}_{AB}:X{\rightarrow}AXB-X$. A number of conditions which are equivalent to '${\Delta}_{AB}$ has closed range' are proved.
ON LEFT AND RIGHT BROWDER OPERATORS
Zivkovic-Zlatanovic, Snezana C.,Djordjevic, Dragan S.,Harte, Robin E. Korean Mathematical Society 2011 대한수학회지 Vol.48 No.5
We discuss the perturbation theory of "left" and "right" Browder operators, which come somewhere between Browder operators and semi Browder operators.