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Spectrum-Sharing Transmission Capacity with Interference Cancellation
Jemin Lee,Andrews, J. G.,Daesik Hong IEEE 2013 IEEE TRANSACTIONS ON COMMUNICATIONS Vol.61 No.1
<P>This paper analyzes large-scale networks that share the spectrum with interference cancellation (IC). The efficiency of spectrum sharing is determined primarily by interference, which in turn depends on the spatial densities, the interference cancellation method, and the spectrum sharing method, i.e., underlay or overlay. By assuming the Poisson distribution for transmitters, equal transmission power in the same system, and an interference-limited environment, this paper finds the performance gain from IC in terms of spectrum-sharing transmission capacity (S-TC), defined as the number of successful transmissions per unit area while guaranteeing the target outage probabilities of all coexisting systems. The effectiveness of IC is characterized by the coefficient of cancellation (CoC), and specific CoC values are derived for two simple IC scenarios, the strong interferer and the close interferer cancellation, with the assumption of having perfect information for channel states of interfering links and interferer locations. The sum S-TC optimal spatial densities of the two systems are given. Finally, CoC conditions to determine the superiority of an underlay or overlay method are presented. We verify that the underlay method could be preferred depending on the CoCs of coexisting systems; that is starkly different from the case without IC, in which the overlay method is always better.</P>
( Jemin Justin Lee ),( Youngjoon Cheon ),( Sangyun Han ),( Kyu Tae Kwak ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.12
The widespread adoption of the social computing paradigm has ushered in the development of online social innovation community (OSIC) as a promising method for solving social problems. Previous studies have not explicitly considered the conceptual factors that facilitate these communities’ users’ innovative activities, so it is vital to conduct empirical studies to verify the effectiveness of these factors. In this paper, the primary goals are to construct a theoretical model of the social innovation and empirically verify the casual relationship between theoretical factors and societal innovativeness. A survey of 398 OSIC users was conducted to empirically validate the theoretical model. The causal relationships between network characteristics and social innovativeness were experimentally tested. The results of this study indicated that ambiguity, switching, and multiplexity are important factors that facilitate social innovativeness, which contradicts the prior assumptions about innovation performance.
Performance Analysis of Cognitive Relay Networks with Simple Relay Selection
Jemin Lee,Gosan Noh,Hano Wang,Sungmook Lim,Eunho Choi,Daesik Hong 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper evaluates the outage probability of cognitive relay networks while adhering to the interference constraint on the primary user, the limited amount of interference which the primary user can tolerate. In the relaying transmission, the relay selection critically affects the performance of relaying transmission and the conventional relay selection criteria are not suitable in cognitive relay networks because of the interference constraint. Hence, the relay selection criterion for cognitive relay networks is proposed and using it, we derive the outage probability. Based on the analysis, we also define the conditions that the relaying transmission achieves better performance in outage probability than the direct transmission. Finally, it is verified that the distance ratio of interfering link to relaying link, the interference threshold as well as the target data rate affect the superiority to relaying transmission compared to the direct transmission in cognitive relay networks.
Jemin Yoo,Yurry Um,Yi Lee 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Platycodon grandiflorum is a species of herbaceous flowering perennial plant of the family Campanulaceae. The major ingredients are platycosides, terpenoid saponins. It contains 1-4 % of the dry weight and there are about 20 types of platycosides. Among them, platycodin D have various pharmacological effects on cough and cold. Platycosides are synthesized from oleanane by mevalonic acid pathway and cytochrome P450s and UGTs are important enzymes in the saponin biosynthesis. UGT is glucose transfer enzyme and act on the final step of the secondary metabolite biosynthesis. In this study, we tried to identify UGT genes involved in saponin biosynthetic pathway from the various tissues of P. grandiflorum and non germinated seeds using RNA-seq analysis. The sequencing was performed using Illumina Hi-Seq platform after cDNA library preparation. The produced reads were assembled using CLC Genomics Workbench software (CLC Bio, Inc.). We obtained 122,663 contigs and found 137 putative UGT genes. The phylogenetic relationship was analyzed and putative genes related to platicoside biosysthesis were selected and cloned for further analysis.
A case of triamcinolone induced fat atrophy treated by Polydeoxyribonucleotide (PDRN) injection
( Jemin Kim ),( Sooyie Choi ),( Young In Lee ),( Jihee Kim ),( Ju Hee Lee ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Atrophy of the skin and subcutaneous tissue is one of the well-known side effects of local injection of corticosteroid. Generally, most cases can be spontaneously improved within a year. However, some lesions may persist yet little has been reported about the treatment. A 26-year-old man presented with linear, atrophic scar with telangiectasia on the right knee. He received arthroscopic reduction and fixation due to anterior cruciate ligament fracture 10 months ago. One month after the surgery, intralesional triamcinolone was injected for the treatment of widening scar. Skin and subcutaneous atrophy developed after the injection, and the condition had not improved for 9 months. We decided to consider polydeoxyribonucleotide(PDRN) injection into the lesion. After 3 sessions of treatments, atrophic site became almost flat and the associated paresthesia was remarkably improved. PDRN is a novel component derived from the germ cells of salmon species, which is a mixture of deoxyriboneucleotides with molecular weights between 50-1,500 kDa. Enhanced wound healing and angiogenesis are well-established characteristics of PDRN. Clinically, PDRN has been shown to improve pressure ulcer, diabetic ulcer, and tendon injury. In vitro treatment of adipose tissue-derived stem cells resulted in adipogenic induction. Therefore, we consider PDRN can be useful treatment modality for the treatment of corticosteroid-induced skin and fat atrophy.
( Jemin Kim ),( Jihee Kim ),( Young In Lee ),( Ju Hee Lee ) 대한피부과학회 2021 Annals of Dermatology Vol.33 No.4
En coup de sabre variant of linear morphea (LM) is a rare sclerotic skin disorder characterized by disfiguring linear depression of the frontal or frontoparietal forehead. Current attempts for cosmetic correction of atrophic lesions must be preceded by an evaluation of disease activity of LM, either by a sufficient clinical assessment or histologic evidence. Corrective procedures including corrective surgery, autologous fat grafting, hyaluronic acid filler injections were performed with varying degrees of success; still, there is a need for treatment options with non-invasive and long-term maintenance effects. Herein we report the use of micronized acellular dermal matrix filler as a novel and successful treatment for the atrophic defect of LM in a 24-year-old female. Molecular characteristics of the micronized acellular dermal matrix filler give enhanced durability and prolonged volume consistency, which results in a long-term extracellular matrix remodeling effect. (Ann Dermatol 33(4) 373∼376, 2021)
Analysis of Phylogenetic Relationship in Platycodon grandiflorum using RAPD Molecular Marker
Jemin Yoo,So Hyeon Park,Yurry Um,Yi Lee 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Platycodon grandiflorum is a perennial herbal plant belongs to Campanulaceae family. It has very important genetic value as a major plant in Asterids order. The major ingredients are platycosides, terpenoid saponins. In Korean industrial plants market, it was produced 5,633 tons in 2013, and the total amount of production was less than only five species, omija, ginger, raspberry, yam and deodeok. P. grandiflorum is called ‘Gilgyung’ and is used as a fresh vegetable and an ornamental plant. Nowadays, various components of P. grandiflorum were already published. But, genetic research is in the starting stage. In this study, 11 cultivars; 1. MariesⅡ, 2. Hakone double white, 3. Hakone double blue, 4. Fuji white, 5. Fuji pink, 6. Fuji blue, 7. Astra white, 8. Astra pink, 9. Astra blue, 10. Astrasemi double blue, 11. Jangback, were analyzed using 60 Operon Universal RAPD primers. The results were phylogenetically analyzed and related to the morphological characteristics of the cultivars.