HomePNA 2.0 모뎀 수신부 설계

최성우,김종원,Choi, Sung-Woo,Kim, Jong-Won 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.9A

본 논문은 HomePNA 2.0 모뎀 칩을 위한 모뎀 수신부의 구조를 제안한다. HomePNA 2.0 전송 채널은 브릿지 탭과 HAM 대역의 영향 등으로 매우 열악하다. 이러한 채널을 통해 전송을 가능하게 하기 위해 HomePNA 2.0 은 훈련신호를 사용하여 매 프레임 마다 채널을 등화하고 FD-QAM 전송 방식을 선택적으로 사용한다. 따라서 모뎀 수신부는 일반적 QAM 방식 신호의 북조 기능과 함께 이러한 전송 방식의 특정을 최대한 상려 모뎀 수신 성 능을 극대화 히는 구조가 필요하다 연구 결과 모뎀 수신부의 가능을 송수신 상태에 따라 정상 수신 모드와 충돌 감지 오드의 2 가지로 정의 하였다 본 논문은 특히, 모뎀 수신부를 구성하는 핵심 블록인 등화기와 위상 동기부, 프레임 동기부에 대해서 사용된 알고리즘을 밝혔으며, 버스트 방식 모뎀의 채널 등화 성능을 높이고 안정적으로 동작 시키기 위한 구조를 제얀 하였다 마지막으로 제안된 모뎀 수신부의 성능을 분석하기 위해서 SPW 모델을 사용하여 채널 별 전송 가능 속도를 예측 하였다. In this paper, we propose the architecture of modem receiver to fabricate HomePNA 2.0 chip. HomePNA suffers from inferior channel because of bridge tap, the effect of amateur HAM band and so on. To transfer data over such channel, HomePNA 2.0 uses training sequence to equalize channel and uses FD-QAM optionally as modulation method. So modem receiver demodulate QAM based signal and needs optimum architecture that fully uses these transmission feature. As a result of research, we define 2 mode function of modem receiver depending on TX/RX state. In this paper, particularly, we show the algorithm of equalizer, carrier phase recovery and frame synchromzationblock and propose architecture that improve the performance of channel equalization and is stable in operation. In the end, we estimate the performance of proposed HomePNA2.0 modem receiver over HomePNA TEST LOOP using SPW program.

진피하 기저세포암

최성우,양정은,장인강,김형옥,조성필 ( Sung Woo Choi,Jeung Eun Yang,In Gang Jang,Hyung Ok Kim,Seong Pil Joh ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.5

Basal cell carcinomas usually arise from the epidermis and show some epidermal connections. It is very unusual that basal celi carcinomas occur as subderrnal mass without epidermal connections. A 51 year-old female h;d an asymptomatic skin colored indurated plaque with linear old scar on the left side of nose fcr about 20 years. She had had a tumor that supposed to be a epidermal cyst, on the same site and the lesion was excised about 20 years ago. We performed the punch biopsy on her first visit which revealed hypertrophic scar. She was treated with intralesional injection of triamcinolone acetonide to reduce the size of hypertrophic scar. However, the lesion had not been reduced. She underwent the surgery to remove the scar at plastic surgery and the excisional biopsy showed a subdermal basal cell carcinoma. We recommend that the newly developed skin tumor in the pre-excised region should be required excisional biopsy instead of punch and close observation (KOfean J Dermatol 1997;35(5): 1036-1039)

한국판 국제 소아천식 및 알레르기 질환 연구 설문지의 신뢰도 및 타당도 연구

최성우,주영수,김대성,김재용,권호장,강대희,이상일,조수헌,Choi, Seong-Woo,Ju, Yeong-Su,Kim, Dae-Sung,Kim, Jae-Yong,Kwon, Ho-Jang,Kang, Dae-Hee,Lee, Sang-Il,Cho, Soo-Hun 대한예방의학회 1998 예방의학회지 Vol.31 No.3

Recent increases of asthma and allergies in childhood made the need for a standardized approach to international and regional comparisons of their prevalence and severity. To address these issues, 'International Study of Asthma and Allergies in Childhood (ISAAC)' is currently underway. In Korea, 'Nationwide Study of Asthma and Allergies in Korean Children' began in 1995 according to ISAAC protocol. ISAAC written and video questionnaires were used in this survey, but their reliability and validity were not evaluated properly yet. In this study, our aim was to evaluate the reliability and validity of two kinds of questionnaires and their usefulness in international and regional comparisons. The test and retest of two questionniares were completed by male(n=110) and female(n=111) middle school students with two and three weeks interval each. Kappa(or weighted kappa) were calculated from each questions and validity coefficients were estimated from those statistics. In Korean version of written questionnaire, the questions for allergic rhinitis, atopic dermatitis, allergic conjunctivitis, and food allergy proved to have high kappa values (or weighted kappa values) and validity coefficients and they can be used in further studies without any correction. But some questions about asthma(especially nocturnal cough, wheezing in exercise, and severe asthma) and drug allergy need to be revised for better under-standing to study subjects. Video questionnaire has the same degree of reliability and validity when compared to written questionnaire and this is the unexpected result. Accordingly, it also need to be revised to overcome the racial and cultural differences of the study subjects. In conclusion, the Korean version of written and video questionnaires may be considered to be useful methods in international and regional comparisons of asthma and allergic diseases in childhood after correction of some questions.

콘크리트용 골재로써 철강산업 부산물의 활용

최성우,김영선,류득현,조봉석,Choi, Sung-Woo,Kim, Young-Sun,Ryu, Deug-Hyun,Cho, Bong-Suk 한국건설순환자원학회 2019 한국건설순환자원학회지 Vol.14 No.2

성인에서 발생한 단발성 근섬유종

최성우,박종갑,김태윤,김형옥,김정원,강석진 ( Sung Woo Choi,Jong Gap Park,Tae Yoon Kim,Hyung Ok Kim,Chung Won Kim,Seok Jin Kang ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.5

Myofibroma and myofibromaiosis are uncommon, benign, mostly self-limiting, probably hamartomatous proliferation of myofibroblasts. These tumors are most often present at birth or before the age of 2 years with multiple ot solitary lesion. Adult cases are rare and most,ly showed as a solitary lesion. We present a case of solitary myofibroma that developed on the vertex of scalp in a 51-year-old man. The lesion was a mild tender and intermittent pruritic firm, pedunclated 1 1cm sized tumor. The iumor was diagnosed as myofibroma by light microscopy and immunohistochemistry. (Korean J Dermatol 1907;35(5): 1031-1035)

Fusarium solani 감염에 의한 만성 육아종성감염

최성우(Sung Woo Choi),허동(Dong Houh),변대규(Dae Gyu Byun),김영환(Yung Hwan Kim),김형옥(Hyung Ok Kim),김정원(Chung Won Kim) 대한피부과학회 1984 대한피부과학회지 Vol.22 No.2

A case of chronic granulomatous infection of Fsarium solani had decreased response to recalled antigens and lacked of dinitrochlorobenzene(DNCB) sensitization in vivo. He has had frequent attacks of common cold-like symptoms and same attacks were very suggestive of pneumonia but he relatively healthy until he developed cutaneous Fusarium infection. Recently he also developed herpes zoster.

요소를 첨가한 모르타르 및 콘크리트의 기초물성

최성우 ( Choi Sung-woo ),류득현 ( Ryu Deug-hyun ),조흥범 ( Cho Hong-bum ),김광기 ( Kim Kwang-ki ),석원균 ( Seok Won-kyun ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1

Urea is liquefied when it is dissolved in water and has the effect of increasing water. It is known that when using urea, it is generally possible to reduce the number of design units in order to ensure the same flow-ability, because the effect of increasing the water when using urea in the manufacturing of concrete is known. In this study, the change of basic properties of concrete when using urea was investigated in concrete production, and the effect of reducing the unit yield was confirmed.

마이크로웨이브 조사에 따른 산화알루미늄이 함유된 실리콘카바이드의 SF₆ 제거

최성우(Sung Woo Choi) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.4

SF6는 지구온난화지수가 가장 높은 중요한 온실가스이다. 본 연구에서는 마이크로파 조사에 따른 산화알루미늄이 혼합된 실리콘카바이드의 SF6 제거실험을 실시하였다. DRE (Decomposition and Removal Efficiencies)실험은 3,000 ppm의 SF6를 사용하여 GC-TCD를 통하여 분석하였다. 산화알루미늄의 함량이 10~30 wt%까지 SF6의 제거효율은 증가하였으나 산화알루미늄의 함 량이 40~50 wt%에서 제거효율이 감소하였다. 특히 900℃ 이상 에서 SiC-Al₂O₃ (20 wt%)와 SiC-Al₂O₃ (30 wt%)는 99.99%의 SF6 제거효율을 보여주었으며 SiC-Al₂O₃ (30 wt%)가 700℃에서 96.72%의 제거효율을 보여주었다. 마이크로파 조사량과 산화알루미늄의 함량을 고려시 SiC-Al₂O₃ (30 wt%)가 SF6 제거에 가장 적절하였다. 본 연구의 결과로 마이크로파에 의한 SF6 제거시 SiC에 Al₂O₃의 함량 조절이 중요할 것으로 사료되어진다. SF6 is the most important greenhouse gas with the highest GWP (global warming potential). The SF6 decomposition study was performed with silicon carbide with aluminium oxide by microwave irradiation. DRE (Decomposition and Removal Efficiencie) of SF6 were evaluated by GC-TCD unit using 3,000 ppm SF6 gas. DRE of SF6 was increased by Al₂O₃ contents to 10~ 30 wt%, otherwise Al₂O₃ content of 40~50 wt% was decreased. DRE of SF6 up to 99.99% have been achieved in SiC-Al₂O₃ (20 wt%) and SiC-Al₂O₃ (30 wt%) above 900℃. Also, the DRE of SiC-Al₂O₃ (30 wt%) at 700℃ showed 96.72%. In addition to consideration microwave input energy and Al₂O₃ content, SiC-Al₂O₃ (30 wt%) can be suggested the best material to control SF6. The results of this study suggest it is important to control content of Al₂O₃ in SiC for decomposition of SF6 with microwave energy.

초기동해를 입은 고로슬래그 콘크리트의 강도발현 특성에 관한 실험적 연구

최성우(Choi, Sung woo),반성수(Ban, Seong Soo),최봉주(Choi, Bong Joo),유득현(Ryu, Deuk Hyun) 한국콘크리트학회 2001 한국콘크리트학회 학술대회 논문집 Vol.2001 No.11

척추외과 의사의 직업성 근골격계 질환

최성우(Sung-Woo Choi),이재철(Jae Chul Lee),장해동(Hae-Dong Jang),전민철(Min-Chul Jeon),김중혁(Joong Hyuk Kim),김충현(Chung-Hyun Kim),박수연(Suyeon Park),신병준(Byung-Joon Shin) 대한정형외과학회 2016 대한정형외과학회지 Vol.51 No.6

목적: 척추외과 의사들의 근골격계 질환의 유병률과 발생 위험요소를 조사하고자 한다. 대상 및 방법: 근골격계 질환에 대한 수정된 discomfort survey를 사용한 설문지를 대한척추외과학회 회원들에게 e-mail로 발송하였다. 설문지의 구성은 인류사회학적 요소, 수술 업무 관련 요소, 근골격계 질환 관련 요소로 이루어졌다. 근골격계 질환의 호발 부위와 발생 위험요소에 대하여 조사하였다. 결과: 총 대상자 420명 중 80명(19.0%)이 응답하였다. 78.8%에서 최근 1년 동안 수술로 인한 근골격계 통증이 있었고, 흔히 발생하는 부위는 목(52.5%), 허리(46.3%), 어깨(18.8%)였다. 척추 수술 집도 개수가 많은 군(>200건/year)에서 그렇지 않은 군보다 주관절/전완부 통증이 많았고(p=0.033), 대수술을 많이 시행하는 군(>10건/year)에서 그렇지 않은 군보다 손목/손의 통증(p=0.008)과 허리의 통증이 더 많았다(p=0.042). 결론: 척추외과 의사들의 78.8%에서 최근 1년 동안 수술로 인한 근골격계 통증이 있었고, 일반인과 비교하였을 때 높은 유병률을 보였다. 이런 현 상태에 대한 정확한 인식과 척추외과 의사들의 근골격계 질환의 예방에 대해 많은 관심이 필요하다. Purpose: To investigate the prevalence and risk factors of musculoskeletal disorder (MSD) among spine surgeons. Materials and Methods: A modified version of discomfort survey was sent via e-mail to surgeons that belong to the Korean Society of Spine Surgery. The survey questionnaires were composed of demographics, factors relating to spine surgery, and MSD. We investigated the common sites of occurrence of MSD and its risk factors. Results: The survey was sent to a total of 420 subjects; of which, 80 subjects (19.0%) responded. About 78.8% of the respondents had MSD for the past year. The common sites of occurrence included the neck (52.5%), back (46.3%), and shoulder (18.8%). The prevalence of pain in the elbow joint/forearm was higher in the group performing a higher frequency of spine surgeries (p=0.033). Moreover, the prevalence of pain in the wrist/hand (p=0.008) and in the back (p=0.042) was higher in those with greater frequency of major surgeries (>10 case/year) as compared with those with lower frequency of major surgeries. Conclusion: As shown, about 78.8% of spine surgeons experienced MSD for the past one year. Its prevalence was higher as compared with the general population. Thus, more attention should be paid to the prevention of MSD among spine surgeons.