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ASE 주입형 R-SOA 기반 기가급 WDM-PON 연구
신홍석,박진우,이경우,이정석,현유정,박성범,신동재,정대광,김승우,윤인국,오윤제 대한전자공학회 2006 電子工學會論文誌-TC (Telecommunications) Vol.43 No.5
Reflective semiconductor optical amplifiers(R-SOAs) were designed with high gain, wide optical bandwidth, high thermal reliability and wide modulation bandwidth in TO-can package for the transmitter of wavelength division multiplexed-passive optical network(WDM-PON) application. Double trench structure and current block layer were introduced in designing the active layer of R-SOA to enable high speed modulation. The injection power requirement and the viable temperature range of WDM-PON system are experimentally analysed in based on Amplified Spontaneous Emission(ASE)-injected R-SOAs. The effect of the different injection spectrum in the gain-saturated R-SOA was experimentally characterized based on the measurements of excessive intensity noise, Q factor, and BER. The proposed spectral pre-composition method reduces the bandwidth of injection source below the AWG bandwidth and thereby avoids spectrum distortion impeding the intensity noise reduction originated from the amplitude squeezing. 낮은 구동 전류에서 이득 포화 현상을 일으키며 높은 변조 속도를 지원하기 위해 충분한 전광 응답 속도가 제공되는 반사형 반도체 광 증폭기(R-SOA)를 TO-can package 형태로 개발하고 기가급 파장분할다중방식 수동형 광가입자망(WDM-PON)에서 적용 가능성을 시험해 보았다. R-SOA의 제작에 Double trench 구조와 개선된 전류 차단층이 도입되어 고속 변조가 가능해졌다. 자기 방출광(ASE) 주입 방식 R-SOA를 기반으로 하는 기가급 WDM-PON에서 전송 가능하기 위해 필요한 주입 광세기 요구 조건과 사용 가능한 온도 범위를 측정하였다. 주입광의 스펙트럼에 따른 R-SOA의 전송 성능의 변화를 초과이득잡음, Q, 에러오율 측정을 통해 분석하였다. 제안된 파형이 기 조성된 ASE 공급 방법을 사용하여 출력 스펙트럼 감소에 의한 전송 신호의 품질 저하를 보완할 수 있음을 확인하였다.
무선 가시광 통신을 위한 MAC Protocol에 대한 연구
신홍석,최정석,이경우,박성범,정대광,이영민,박진우 한국통신학회 2009 정보와 통신 Vol.26 No.5
본고에서는 무선 가시광 통신을 위한 Medium Access Control (MAC) 프로토콜의 설계에 관해 기술한다. 조명등을 이용한 가시광 무선랜 네트워크는 고정된 상태의 Access Point (AP)에 의한 인프라를 Mobile Node (MN)를 상대로 구성하고 인터넷과 같은 기존의 인프라와 연결되는 구조적 특징을 가진다. 이러한 네트워크에 사용되는 무선 가시광 통신 채널의 특성을 이해하고 MAC 프로토콜의 기능에 대한 요구조건을 도출하였다. 주어진 가시광 통신 채널을 효율적으로 사용할 수 있도록 시분할다중 접속 방식과Full duplex를 도입하는 Frame 구조를 구성하였고 가시성을 이용한 접속 절치를 제안하였다.
신홍석,Young Hwan Lee 대한남성과학회 2011 The World Journal of Men's Health Vol.29 No.3
Rectal bleeding is a frequent finding in patients after transrectal ultrasonography (TRUS)-guided prostate biopsy but is usually mild and stops spontaneously. We report herein a case of life-threatening hypovolemic shock due to rectal bleeding after TRUS-guided prostate biopsy that was successfully treated by selective arterial embolization. The aim of this report is to share our experiences of the management of massive rectal bleeding after prostate biopsy.
Tuberculosis of the Glans Penis Presenting as Glans Gangrene
신홍석,박재신 대한요로생식기감염학회 2016 Urogenital Tract Infection Vol.11 No.1
Tuberculosis of the glans penis is rare. The clinical features of tuberculosis of the glans penis include the appearance of a superficial ulcer of the glans. We recently experienced a case of tuberculosis of the glans penis presenting as an ulcer, which progressed to glans necrosis. A 46-year-old man presented at our institution with painful ulcerative penile lesions. Initial pathological findings of the ulcers showed non-granulomatous inflammatory changes. He was treated with antibiotics and anti-inflammatory drugs for 6 months, and during that time, his glans ulcers progressed to glans gangrene. A partial glansectomy showed multiple epithelioid granulomas with central caseous necrosis, which was compatible with the findings of tuberculosis. The patient received anti-tuberculosis chemotherapy. The current case is reported to alert physicians to consider the possibility of tuberculosis when evaluating unusual penile glans lesions.
신홍석,유진욱,정희창,박동춘 영남대학교 기초/임상의학연구소 2001 Yeungnam University Journal of Medicine Vol.18 No.1
Background: The purpose of this study was to determine the efficacy and safety of the anterior vaginal wall sling in the management of women with stress urinary incontinence. Materials and Methods: From January 1998 to December 1999, 42 patients(31 with genuine stress urinary incontinence and 11 with mixed urinary incontinence, 38 with anatomical incontinence and 4 with intrinsic sphincteric deficiency) underwent anterior vaginal wall sling at Yeungnam University Hospital were studied retrospectively. The mean age was 49.3 years(ranging from 34 to 66 years of age) and the mean follow-up period was 29.4 months(ranging from 16 to 40 months). Intra- and postoperative complication, success rate and patient's satisfaction were evaluated. Results: The mean operation time was 79 minutes(ranging from 65 to 124 minutes) and the mean hospital stay was 5.1 days(ranging from 4 to 10 days). Mean postoperative Foley catheter drainage was 2.1 days(ranging from 1 to 5 days). As a complication, bladder perforation occurred in one patient(2.4%), residual urine sensation developed in seven patients(16.7%), and suprapubic pain was complained in five patients(11.9%), which improved gradually. Vaginal epithelial inclusion cyst occurred in one patient(2.4%) at postoperative 31 months. Four(9.4%) patients with de novo instablility were improved by anticholinergics medication. The success rate was 92.9% and 38 patients(90.5%) were satisfied with this procedure. Conclusion: We consider that the anterior vaginal wall sling to be a safe and effective surgical procedure for the treatment of female stress urinary incontinence, but a longer follow-up is necessary to determine long term effect.
사춘기 정계정맥류환자에서 음낭복합도플러초음파로 측정한 망상정맥총의 역류된 혈류량과 고환용적 차이와의 관계
신홍석,박재신 대한남성과학회 2009 The World Journal of Men's Health Vol.27 No.3
Purpose: The aim of this study is to assess effects of testicular volume difference and retrograde venous flow of pampiniform plexus measured by Duplex Doppler Ultrasonograpy (DDU) in patients with adolescent varicocele. Materials and Methods: Physical examinations and DDU were performed to assess varicocele in fifty five patients with left sided adolescent varicocele. During both normal respiration and the Valsalva's maneuver, the maximum venous diameter (MVD), maximal velocity of reflux and the peak retrograde flow volume (RFV) was measured by DDU. The percentage testicular volume difference (%) between the right and left testicle was calculated as (right testicular volume-left testicular volume)x100/right testicular volume and divided into 3 group; below 10%, 10∼20%, >20%. Grade of varicocele, MVD and peak RFV were analyzed as possible determinants of testicular hypotrophy in adolescent varicocele. Results: A total of 55 patients (mean age 17.8 years, range 12 to 20) were included in this study. Of these, physical examination reviewed that 7 (12.7%), 18 (32.7%), 30 (54.6%) patients had grade I, II or III varicoceles on the left side respectively. The mean MVD was significantly higher according to grade of varicocele. The mean maximal velocity of reflux was significantly higher in the patients grade II and III than grade I, but was not significant between grade II and III. The mean peak RFV was significantly higher according to grade of varicocele. RFV was the only significant parameter of predictive value for percentage testicular volume difference. Conclusions: Patients with peak RFV >35ml minutes showed significant reduction of testicular volume. Measurement of RFV is recommended as predictive tools for assessing the percentage testicular volume difference in patients with adolescent varicocele.