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Choe, Joong-Seon,Ko, Heasin,Choi, Byung-Seok,Kim, Kap-Joong,Youn, Chun Ju IEEE 2018 IEEE photonics journal Vol.10 No.1
<P>We have developed an integrated polarization beam splitter (PBS) module with silica planar lightwave circuit technology for use in BB84 quantum key distribution (QKD). The PBS module is designed to operate on four linear polarizations of the horizontal/vertical/diagonal/antidiagonal direction, and shows the minimum polarization extinction ratio of 17.6 dB. When the module is loaded on the free-space BB84 QKD test-bed, quantum bit error rate and sifted key rate are 2.81% and 415 kb/s at clock rate of 100 MHz, respectively.</P>
Molecular Analysis of Malassezia Microflora on the Skin of the Patients with Atopic Dermatitis
( Seon Mi Yim ),( Ji Young Kim ),( Jong Hyun Ko ),( Yang Won Lee ),( Yong Beom Choe ),( Kyu Joong Ahn ) 대한피부과학회 2010 Annals of Dermatology Vol.22 No.1
Background: The yeasts of the genus Malassezia are members of the normal flora on human skin and they are found in 75∼80% of healthy adults. Since its association with various skin disorders have been known, there have been a growing number of reports that have implicated Malassezia yeast in atopic dermatitis (AD). Objective: The aim of the present study is to isolate the various Malassezia species from AD patients by using 26S rDNA (ribosomal Deoxyribonucleic acid) PCR-RFLP and to investigate the relationship between a positive Malassezia culture and the severity of AD. Methods: Cultures for Malassezia yeasts were taken from the scalp, cheek, chest, arm and thigh of 60 patients with atopic dermatitis. We used a rapid and accurate molecular biological method 26S rDNA PCR-RFLP, and this method can overcome the limits of the morphological and biochemical methods. Results: Positive Malassezia growth was noted on 51.7% of the patients with atopic dermatitis by 26S rDNA PCR-RFLP analysis. The overall dominant species was M. sympodialis (16.3%). M. restricta was the most common species on the scalp (30.0%) and cheek (16.7%). M. sympodialis (28.3%) was the most common species on the chest. The positive culture rate was the highest for the 11∼20 age group (59.0%) and the scalp showed the highest rate at 66.7%. There was no significant relationship between the Malassezia species and SCORing for Atopic Dermatitis (SCORAD). Conclusion: The fact that the cultured species was different for the atopic dermatitis lesion skin from that of the normal skin may be due to the disrupted skin barrier function and sensitization of the organism induced by scratching in the AD lesion-skin. But there was no relationship between the Malassezia type and the severity score. The severity score is thought to depend not on the type, but also on the quantity of the yeast. (Ann Dermatol 22(1) 41∼47, 2010)
Yong-Hwan Kwon,Joong-Seon Choe,Jae-Sik Sim,Sung-Bock Kim,HoGyeong Yun,Kwang-Seong Choi,Byung-Seok Choi,Eun-Soo Nam 한국전자통신연구원 2009 ETRI Journal Vol.31 No.6
In this paper, we present the fabrication of 40 Gb/s traveling-wave electroabsorption modulator-integrated laser (TW-EML) modules. A selective area growth method is first employed in 40 Gb/s EML fabrication to simultaneously provide active layers for lasers and modulators. The 3 dB bandwidth of a TW-EML module is measured to be 34 GHz, which is wider than that of a lumped EML module. The 40 Gb/s non-return-to-zero eye diagram shows clear openings with an average output power of +0.5 dBm.
Right-Angle-Bent CPW for the Application of the Driver-Amplifier-Integrated 40 Gbps TW-EML Module
윤호경,최광성,권용환,Joong-Seon Choe,문종태,이명현 한국전자통신연구원 2006 ETRI Journal Vol.28 No.5
In this letter we present a right-angle-bent coplanar waveguide (CPW) which we developed for the application of the driver amplifier-integrated (DAI) 40 Gbps traveling wave electroabsorption modulated laser module. The developed CPW realized parallel progression of the radio frequency (RF) and light using a dielectric overlay structure and wedge bonding on the bending section. The measured S11 and S21 of the developed CPW were kept below –10 dB up to 35 GHz and –3 dB up to 43 GHz, respectively. These measured results of the CPW were in good agreement with the simulation results and demonstrated the applicability of the CPW to the 40 Gbps communication module.
권용환,최병석,김제하,Joong-Seon Choe,Kisoo Kim,Kwang-Seong Choi,HoGyeong Yun 한국전자통신연구원 2005 ETRI Journal Vol.27 No.5
We fabricated 40 Gb/s front-end optical receivers using spot-size converter integrated waveguide photodiodes (SSC-WGPDs). The fabricated SSC-WGPD chips showed a high responsivity of approximately 0.8 A/W and a 3 dB bandwidth of approximately 40 GHz. A selective wetetching method was first adopted to realize the required width and depth of a tapered waveguide. Two types of electrical pre-amplifier chips were used in our study. One has higher gain and the other has a broader bandwidth. The 3 dB bandwidths of the higher gain and broader bandwidth modules were about 32 and 42 GHz, respectively. Clear 40 Gb/s non-return-to-zero (NRZ) eye diagrams showed good system applicability of these modules.
Optimization of a Birefringence-Enhanced-Waveguide-Based Polarization Beam Splitter
Jong-Hoi Kim,Joong-Seon Choe,윤천주,김덕준,권용환,남은수 한국전자통신연구원 2012 ETRI Journal Vol.34 No.6
We present the optimization of a birefringence-enhanced-waveguide (BWG)-based polarization beam splitter (PBS) in a Mach-Zehnder interferometer (MZI) configuration and analyze the structure-dependent or polarization-dependent phase difference, using a delay-line MZI (DL-MZI). We fabricate the DL-MZI using silica-based planar lightwave circuit technology and, using the DL-MZI, demonstrate the ability to optimize a PBS by measuring the birefringence of the BWG and structure-dependent phase offset.