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Cho, K. S.,Cheon, K. S.,Hong, S. Y.,Cho, J. H.,Im, J. S.,Mekapogu, M.,Yu, Y. S.,Park, T. H. Springer International 2016 Plant cell reports Vol. No.
<P>Chloroplast genome of Solanum commersonii and S olanum tuberosum were completely sequenced, and Indel markers were successfully applied to distinguish chlorotypes demonstrating the chloroplast genome was randomly distributed during protoplast fusion. Somatic hybridization has been widely employed for the introgression of resistance to several diseases from wild Solanum species to overcome sexual barriers in potato breeding. Solanum commersonii is a major resource used as a parent line in somatic hybridization to improve bacterial wilt resistance in interspecies transfer to cultivated potato (S. tuberosum). Here, we sequenced the complete chloroplast genomes of Lz3.2 (S. commersonii) and S. tuberosum (PT56), which were used to develop fusion products, then compared them with those of five members of the Solanaceae family, S. tuberosum, Capsicum annum, S. lycopersicum, S. bulbocastanum and S. nigrum and Coffea arabica as an out-group. We then developed Indel markers for application in chloroplast genotyping. The complete chloroplast genome of Lz3.2 is composed of 155,525 bp, which is larger than the PT56 genome with 155,296 bp. Gene content, order and orientation of the S. commersonii chloroplast genome were highly conserved with those of other Solanaceae species, and the phylogenetic tree revealed that S. commersonii is located within the same node of S. tuberosum. However, sequence alignment revealed nine Indels between S. commersonii and S. tuberosum in their chloroplast genomes, allowing two Indel markers to be developed. The markers could distinguish the two species and were successfully applied to chloroplast genotyping (chlorotype) in somatic hybrids and their progenies. The results obtained in this study confirmed the random distribution of the chloroplast genome during protoplast fusion and its maternal inheritance and can be applied to select proper plastid genotypes in potato breeding program.</P>
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200 GeV/핵자 유황이온과 핵건판핵의 충돌에 의해 생성된 헬륨 파쇄핵의 극한파쇄 연구
김동철,송진섭,윤천실,정성헌,박인곤,김종오,김철수,김태연,이승희,조재희,천병구,김재률,김준원,김태익,박명렬,장한일,임인택 慶尙大學校 기초과학연구소 1992 基礎科學硏究所報 Vol.8 No.-
고에너지 중이온 원자핵과 핵건판의 충돌에서, 200GeV/핵자 유황이온에 의해 생성된 파쇄 헬륨핵(Z=2)의 실험실계의 방출각 분포는 표적핵에 무관한 회귀공식. dN=exp[a+k exp(η-y_b)]d[exp(η-y_b)]로 잘 표현된다. 여기에서 의사신속도 η=-ln[tan(θ/2)]이고, y_b는 실험실계의 입사입자(^32S)의 신속도이다. 이 공식에 의한 적합에서 k=-0.057±0.008로 얻어진다. 즉, 핵건판과 고에너지 중이온의 충돌에서 파쇄 헬륨핵의 exp(η-y_b)의 분포는 "극한파쇄" 현상을 잘 설명하고 있다. The angular distribution of emission angle θ of helium (Z=2) produced in the collisions of incident particles of 200 GeV/nucleon ^32S in nuclear emulsion is well expressed by dN=exp[a+k exp(η-y_b)]d[exp(η-y_b)] where the pseudorapidity is η=-ln[tan(θ/2)], the laboratory system primary rapidity is y_b, and k=-0.057+0.008. The shape of this frequency of occurrence distributions in terms of exp(η-y_b) attests to the validity of the concept of "limiting fragmentation" for helium projectile fragments produced in the projectile fragmentation regions of heavy ion collisions in nuclear emulsion.
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Cheon, H.L.,Shin, J.Y.,Park, K.H.,Chung, M.S.,Kang, D.H. Butterworths ; Taylor Francis ; Elsevier Science 2015 Food Control Vol.50 No.-
This study was performed to investigate the effectiveness of combined ultraviolet (UV-C) irradiation and mild heating as an alternative to conventional inactivation of foodborne pathogens, including Escherichia coli O157:H7 and Salmonella Typhimurium on powdered red pepper. A cocktail of three strains of E. coli O157:H7 ATCC 35150, ATCC 43889, ATCC 43890) and S. Typhimurium (ATCC 19585, ATCC 43971, DT 104) was inoculated onto powdered red pepper and then treated with UV-C irradiation and mild heat. A constant UV intensity (3.40 mW/cm<SUP>2</SUP>) of the emitting lamps was applied to samples for 5, and 10 min at 25, 35, 45, 55, and 65 <SUP>o</SUP>C, respectively. Also, quality change of powdered red pepper was measured in order to identify the efficiency of combined treatment. The reduction levels of E. coli O157:H7 and S. Typhimurium on powdered red pepper when treated with UV-C irradiation alone at 20.4 kJ/m<SUP>2</SUP> for 10 min was 0.22 and 0.29 log CFU/g, respectively. While, combined treatment with mild heating at 65 <SUP>o</SUP>C reduced the surviving numbers of each pathogens by 2.88 and 3.06 log CFU/g, respectively. Although the inactivation efficiency was influenced less by the UV-C radiation dose, the synergistic effect was observed with increasing temperature and UV-C radiation dose. CIE color value and extractable color value were not significantly (P > 0.05) different between non-treated and combination treated samples. The moisture and capsaicinoids contents showed significant (P < 0.05) differences when treated at 65 <SUP>o</SUP>C because of sample drying during heat treatment. Therefore, these results suggest that UV-C irradiation combined with mild heating can be utilized by the food industry in order to effectively inactivate E. coli O157:H7 and S. Typhimurium without incurring quality deterioration of powdered red pepper.
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Cheon, S. J.,Lim, S. P.,Park, J. Y. IEEE 2012 IEEE transactions on components, packaging, and ma Vol.2 No.7
<P>A compact ultra-wideband bandpass filter was newly designed and implemented by embedding all the passive components into a printed circuit board with a high dielectric composite film layer. It was designed using a modified third-order Chebyshev circuit topology to obtain a large bandwidth. J-inverter transformation technology was then applied in order to reduce the size of the filter and avoid unwanted electromagnetic coupling among the filter circuit elements. A capacitor and two inductors connected in series with three parallel resonators were newly applied to generate three independent transmission zeros for improving the rejection characteristics at the lower and upper stopbands of the proposed filter. The measured maximum insertion loss in the passband range from 3.1 to 4.75 GHz was better than 1.68 dB and the return loss was higher than 12 dB. The transmission zeros of the measured response occurred at 2.2 and 5.15 GHz and provided suppressions of 31 and 20 dB in the wireless local area networks bands of 2.4 and 5.15 GHz, respectively. The group delay in the passband was lower than 0.62 ns. The size of the fabricated filter was 2.9 × 2.8 × 0.55 (H) mm<SUP>3</SUP>.</P>
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Lee, K.J.,Cha, D.Y.,Cheon, S.J.,Yeo, M.,Cho, S.W. S. Karger AG 2009 Digestion Vol.80 No.1
<P><I>Background/Aims:</I> Ghrelin affects gastric motility. However, little is known about the role of ghrelin in the pathophysiology of functional dyspepsia (FD). We investigated plasma ghrelin levels and their relationship with gastric emptying time in dysmotility-like FD patients. <I>Methods:</I> 42 patients with dysmotility-like FD and 14 healthy volunteers were enrolled in the study. Gastric half-emptying time was measured using a radiolabeled meal. Plasma total ghrelin levels before and after the meal were determined using a radioimmunoassay kit. <I>Results:</I> Preprandial ghrelin levels were significantly lower in FD patients than in controls. Postprandial ghrelin levels were similar between the two groups. Abnormally low preprandial ghrelin levels were observed in 7 out of 42 patients, in whom significant postprandial decrease of ghrelin levels was absent. Delayed gastric emptying was observed in 5 out of 7 patients with abnormally low ghrelin levels. Pre- or postprandial ghrelin levels were not significantly correlated with gastric half-emptying time, both in the patient group and in the control group. <I>Conclusions:</I> Abnormally low preprandial ghrelin levels and absence of significant postprandial decrease of ghrelin levels are present in a subset of dysmotility-like FD patients. Further investigation on the pathogenetic implication of these alterations in FD is required.</P><P>Copyright © 2009 S. Karger AG, Basel</P>
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Some combinatorial applications of the q-Riordan matrix
Cheon, G.S.,Jung, J.H. North Holland [etc.] 2015 Linear algebra and its applications Vol.482 No.-
Recently, the authors developed a q-analogue for Riordan matrices by means of Eulerian generating functions of the form g(z)=@?<SUB>n≥0</SUB>g<SUB>n</SUB>z<SUP>n</SUP>/n!<SUB>q</SUB> where n!<SUB>q</SUB> is the q-factorial. We apply this concept to give q-analogues of some familiar objects from the set partitions with double restrictions on blocks, namely the (r,s)-Bessel numbers of both types. By setting r=0 and letting s→~, these numbers may be reduced to the q-Stirling numbers of both kinds. Several algebraic formulas for the q-analogues are also derived using combinatorial methods together with the concept of q-Riordan matrices. In particular, q-analogues of the classical Bessel numbers of both kinds and their combinatorial interpretations are obtained.
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Cheon, S.J.,Park, J.Y. Mackintosh Publications] 2014 Microelectronics Journal Vol.45 No.7
In this paper, a compact dual-band ultra-wideband (UWB) filter has been newly designed and fabricated for 3.1-4.75GHz and 6.0-8.5GHz UWB system applications by embedding all passive lumped elements into low temperature co-fired ceramic (LTCC) substrate. In order to reduce its size/volume and prevent parasitic electromagnetic (EM) coupling between the embedded passive elements, it was newly designed by using a modified 3rd order Chebyshev filter topology and J-inverter transformation technology. Moreover, in order to completely reject the wireless local area network (WLAN) bands of 2.4GHz and 5.15GHz, an independent transmission zeros technology was applied. For forming the higher passband, lowpass filters were also applied with two LC resonant circuits by using roll-off characteristics by independent transmission zeros. The measured insertion losses in the lower and upper passbands were better than 2.5 and 2.3dB, respectively. Return loss and group delay were better than 8dB and 0.61ns, respectively in all the passbands. Independent transmission zeros that occurred at 5.17 and 5.42GHz provided suppression of 22dB at the WLAN band. The size/volume of the fabricated LTCC dual-band UWB filter was 3.65x2.35x0.65 (H)mm<SUP>3</SUP>.
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