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光学学报 2003年第S1期23卷 503-504页

作者： Ki-Hyuk Lee woo-young choi Department of Electrical and Electronic Engineering Yonsei University Seoul KoreaDepartment of Electrical and Electronic Engineering Yonsei University Seoul Korea

We demonstrate a new technique of measuring differential carrier lifetime and linewidth enhancement factor in a semiconductor optical amplifier. In our method, the optical responses and fiber transfer functions of a self-gain modulated SOA are measured and, from these, values of carrier lifetimes and linewidth enhancement factors are determined for various SOA input optical powers.

关键词： SOA in as A Novel Technique of Measuring SOA Differential Carrier Lifetime and a Factor Using SOA Optical Modulation Response of

Isolated peritoneal lymphomatosis defined as post-transplant lymphoproliferative disorder after a liver transplant: A case report

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World Journal of Clinical Cases 2019年第24期7卷 4299-4306页

作者： Hong Beum Kim Ran Hong Yung Sub Na woo young choi Sang Gon Park Hee Jeong Lee Department of Premedical Course Chosun University School of MedicineGwangju 501-717South Korea Department of Pathology Chosun University Hospital365 Pilmun-daeroDong-guGwangju 501-717South Korea Department of Internal Medicine PulomonologyChosun University HospitalGwangju 501-717South Korea Department of Plastic and Reconstructive Surgery Chosun University HospitalGwangju 501-717South Korea Department of Internal Medicine Hemato-oncologyChosun University HospitalGwangju 501-717South Korea MD PhDDepartment of HematoOncologyChosun University Hospital365 Pilmun-daeroDong-guGwangju 501-717South Korea

BACKGROUND Post-transplant lymphoproliferative disorder(PTLD) is a fatal complication of solid organ transplantation or allogenic hematopoietic stem cell transplantation that is associated with immunosuppressive therapy. Potential manifestations are diverse, ranging from reactive lymphoid hyperplasia to high-grade *** is usually of B-cell origin and associated with Epstein-Barr virus(EBV)infection. Herein, we describe a case of PTLD involving the peritoneal *** has been only case of PTLD as a diffuse large B-cell lymphoma(DLBCL) in the *** SUMMARY The patient was a 62-year-old man who had been receiving immunosuppressive therapy with tacrolimus since undergoing a liver transplant 15 years prior. He reported that he had experienced abdominal discomfort and anorexia 1 month prior to the current admission. Abdominal pelvic computed tomography(CT)revealed peritoneal and omental mass-like lesions without bowel ***-guided biopsy was performed, and he was histologically diagnosed with EBV-negative DLBCL. Positron emission tomography(PET)-CT depicted peritoneum and omentum involvement only, without any lymphadenopathy or organ masses, including in the gastrointestinal tract. Six cycles of chemotherapy with a "R-CHOP" regimen(rituximab-cyclophosphamide, doxorubicin, vincristine, prednisolone) were administered,and PET-CT performed thereafter indicated complete *** This is the first report of isolated peritoneal lymphomatosis defined as PTLD in a liver transplant recipient.

关键词： Case report Diffuse large B-cell lymphoma Epstein-Barr virus infection Posttransplant lymphoproliferative disorder R-CHOP Isolated peritoneal lymphomatosis

Differential diagnosis of left-sided abdominal pain:Primary epiploic appendagitis vs colonic diverticulitis

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World Journal of Gastroenterology 2013年第40期19卷 6842-6848页

作者： Jeong Ah Hwang Sun Moon Kim Hyun Jung Song Yu Mi Lee Kyung Min Moon Chang Gi Moon Hoon Sup Koo Kyung Ho Song Yong Seok Kim Tae Hee Lee Kyu Chan Huh young woo choi young woo Kang woo Suk Chung Division of Gastroenterology and Hepatology Department of Internal MedicineKonyang University College of MedicineDaejeon 302-718South Korea Department of Diagnostic Radiology Konyang University College of MedicineDaejeon 302-718South Korea

AIM:To investigate the clinical characteristics of left primary epiploic appendagitis and to compare them with those of left colonic ***:We retrospectively reviewed the clinical records and radiologic images of the patients who presented with left-sided acute abdominal pain and had computer tomography(CT) performed at the time of presentation showing radiological signs of left primary epiploic appendagitis(PEA) or left acute colonic diverticulitis(ACD) between January 2001 and December 2011. A total of 53 consecutive patients were enrolled and evaluated. We also compared the clinical characteristics,laboratory findings,treatments,and clinical results of left PEA with those of left ***:Twenty-eight patients and twenty-five patients were diagnosed with symptomatic left PEA and ACD,respectively. The patients with left PEA had focal abdominal tenderness on the left lower quadrant(82.1%). On CT examination,most(89.3%) of the patients with left PEA were found to have an oval fatty mass with a hyperattenuated ring sign. In cases of left ACD,the patients presented with a more diffuse abdominal tenderness throughout the left side(52.0%vs 14.3%; P = 0.003). The patients with left ACD had fever and rebound tenderness more often than those with left PEA(40.0% vs 7.1%,P = 0.004; 52.0% vs14.3%,P = 0.003,respectively). Laboratory abnormalities such as leukocytosis were also more frequently observed in left ACD(52.0% vs 15.4%,P = 0.006).CONCLUSION:If patients have left-sided localized abdominal pain without associated symptoms or laboratory abnormalities,clinicians should suspect the diagnosis of PEA and consider a CT scan.

关键词： Acute abdomen Differential diagnosis Appendix epiploica Colonic diverticulitis Multidetector computed tomography

Series resistance influence on performance of waveguide-type germanium photodetectors on silicon

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Chinese Optics Letters 2017年第10期15卷 15-19页

作者： Jeong-Min Lee Minkyu Kim and woo-young choi Department of Electrical and Electronic Engineering Yonsei University Seoul 120-749 South Korea

We investigate influences of series resistances on the performance of 1.55 μm waveguide-type germanium photodetectors（Ge-PDs） on a silicon-on-insulator substrate. The current-voltage characteristics, responsivities,saturation photo-current characteristics, electrical reflection coefficients, and photodetection frequency responses of Ge-PDs, having different series resistances, are measured, and their equivalent circuit models are established. By analyzing the resulting circuit model parameters, we determine how much Ge-PD series resistances influence Ge-PD saturation photo-currents and photodetection bandwidth. These results should be of great use for optimization of Ge-PD fabrication processes and device parameters for target applications.

关键词： Si Series resistance influence on performance of waveguide-type germanium photodetectors on silicon PD Figure

Influence of dynamic power dissipation on Si MRM modulation characteristics

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Chinese Optics Letters 2017年第7期15卷 42-45页

作者： Byung-Min Yu Myungjin Shin Min-Hyeong Kim Lars Zimmermann woo-young choi Department of Electrical and Electronic Engineering Yonsei University Innovations for High Performance Microelectronics (IHP)

We experimentally observe that Si micro-ring modulator（MRM） modulation characteristics are strongly influenced by the modulation data rate and the data pattern and determine this influence is due to the temperature increase caused by dynamic power dissipation within the Si MRM device. We also quantitatively determine the amount of Si MRM resonance wavelength shift due to different modulation data rates, data patterns, and modulation voltages. Our results should be of great help for achieving reliable and optimal modulation characteristics for Si MRMs.

关键词： dissipation modulator quantitatively heating Figure thick electrically fabrication photonics buried

High-responsivity InAs quantum well photo-FET integrated on Si substrates for extended-range short-wave infrared photodetector applications

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Photonics Research 2023年第8期11卷 1465-1473页

作者： DAEHWAN AHN SUNGHAN JEON †HOyoung SUH SEUNGWAN woo RAFAEL JUMAR CHU DAEHWAN JUNG WON JUN choi DONGHEE PARK JIN-DONG SONG woo-young choi JAE-HOON HAN Center for Opto-Electronic Materials and Devices Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Electrical and Electronic Engineering Yonsei UniversitySeoul 03722Republic of Korea

Low-intensity light detection necessitates high-responsivity *** achieve this,we report In_(0.53)Ga_(0.47)As∕In As∕In_(0.53)Ga_(0.47)As quantum well(InAs QW)photo-field-effect-transistors(photo-FETs)integrated on a Si substrate using direct wafer *** of the In As QW channel was carefully designed to achieve higher effective mobility and a narrower bandgap compared with a bulk In_(0.53)Ga_(0.47)As,while suppressing the generation of defects due to lattice ***-performance 2.6 nm In As QW photo-FETs were successfully demonstrated with a high on/off ratio of 10~5 and a high effective mobility of 2370 cm^(2)∕(V·s).The outstanding transport characteristics in the InAs QW channel result in an optical responsivity 1.8 times greater than InGaAs photo-FETs and the fast rising/falling ***,we experimentally confirmed that the InAs QW photo-FET can detect light in the short-wavelength infrared(SWIR;1.0–2.5μm)near 2μm thanks to bandgap engineering through In As QW *** result suggests that the InAs QW photo-FET is promising for high-responsivity and extended-range SWIR photodetector applications.

关键词： responsivity quantum wave

Diagnostic and management challenges in primary cutaneous anaplastic large cell lymphoma with necrosis,inflammation,and surgical intervention:A case report

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World Journal of Clinical Cases 2024年第31期12卷 6486-6492页

作者： Jun Mo Kim woo young choi Ji Seon Cheon Department of Plastic Reconstructive Surgery Chosun University College of MedicineGwangju 61453South Korea

BACKGROUND Primary cutaneous anaplastic large cell lymphoma(PC-ALCL)poses significant diagnostic difficulties due to its similarity in the appearance of skin lesions with chronic inflammatory disorders and other dermatological *** study aims to investigate these challenges by conducting a comprehensive analysis of a case presenting with PC-ALCL,emphasizing the necessity of accurate differentiation for appropriate *** SUMMARY An 89-year-old female patient with diabetes and hypertension presented with arm and abdominal ulcerated mass *** procedures included skin biopsies,histopathological assessments,and immunohistochemistry,complemented by advanced imaging techniques to confirm the *** patient’s lesions were determined as PC-ALCL,characterized by necrosis,chronic inflammation,and a distinct immunophenotypic profile,including CD30,CD3,CD4,and EBER,CD56,MUM-1,Ki 67-positive in>80%of tumor cells,CD10,but negative for anaplastic lymphoma kinase,CD5,CD20,PAX-5,Bcl-2,Bcl-6,CD8,and *** was not reported at the 6-month *** Accurate PC-ALCL differentiation from similar conditions is crucial for effective management and requires a multidisciplinary approach.

关键词： Primary cutaneous anaplastic large cell lymphoma Chronic inflammation Necrosis Diagnostic challenges Dermatological oncology Case report

Ear keloid and epidermal cyst following auricular cartilage harvest for rhinoplasty:A case report

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World Journal of Clinical Cases 2024年第20期12卷 4434-4439页

作者： Jun Mo Kim Ji Seon Cheon woo young choi Department of Plastic Reconstructive Surgery Chosun University College of MedicineGwangju 61453South Korea Department of Plastic and Reconstructive Surgery Chosun University College of MedicineGwangju 61453South Korea

BACKGROUND This case report highlights a rare instance of concurrent keloid and epidermal cyst development at an ear cartilage harvest site following rhinoplasty in a 25-year-old *** conditions,which typically stem from skin trauma,seldom occur together,demonstrating the exceptional characteristics of this *** SUMMARY The patient underwent successful surgical removal of both the keloid and the epidermal *** treatment included the use of silicone sheets,gel,and oral tranilast to reduce *** recurrence was observed over a 6-mo follow-up period,indicating effective management of the *** The effective management of complex skin trauma cases underscores the need for individualized treatment strategies in plastic surgery.

关键词： Ear keloids Epidermal cysts Auricular cartilage harvesting Rhinoplasty complications Case report

Single-chip Si optical single-sideband modulator

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Photonics Research 2018年第1期9卷 6-11页

作者： BYUNG-MIN Yu JEONG-MIN LEE CHRISTIAN MAI STEFAN LISCHKE LARS ZIMMERMANN AND woo-young choi Department of Electrical and Electronic Engineering Yonsei University 50 Yonsei-Ro Seodaemoon-gu Seoul 120-749 South Korea IHP Im Technologiepark 25 15236 Frankfurt (Oder) Germany

We demonstrate an integrated Si optical single-sideband(OSSB) modulator composed of a parallel dual-ring modulator(PDRM) and a quadrature hybrid coupler(QHC). Both the PDRM and the QHC are carefully designed for 30 GHz opearation, and their operations are verified by measurement. The Si OSSB modulator successfully generates a single sideband with larger than 15 dB suppression of the undesired sideband.

关键词：硅光单边带平行双环形调制器正交混合耦合器通讯技术

Silicon electronic-photonic integrated 25 Gb/s ring modulator transmitter with a built-in temperature controller

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Photonics Research 2021年第4期9卷 507-513页

作者： Minkyu Kim Min-Hyeong Kim youngkwan Jo Hyun-Kyu Kim Stefan Lischke Christian Mai Lars Zimmermann woo-young choi Department of Electrical and Electronic Engineering Yonsei University03722 SeoulRepublic of Korea Samsung Electronics Hwasung18448 Gyeonggi-doRepublic of Korea IHP Im Technologiepark 2515236 Frankfurt(Oder)Germany Technische Universität Berlin Einsteinufer 2510587 BerlinGermany

We demonstrate a silicon electronic–photonic integrated 25 Gb/s nonreturn-to-zero transmitter that includes driver circuits,depletion-type Si ring modulator,Ge photodetector,temperature sensor,on-chip heater,and temperature controller,all monolithically integrated on a 0.25μm photonic BiCMOS technology *** integrated transmitter successfully provides stable and optimal 25 Gb/s modulation characteristics against external temperature fluctuation.

关键词： Gb/s modulator BiCMOS