[제9주차 정규강좌] “탄소중립시대, 왜 도시인가?” / “지속가능발전의 의미와 전략”

송재민,김부열 서울대학교 환경대학원 2021 環境論叢 Vol.68 No.-

한국형 토양유실공식에 의한 토양유실량 현장예측

송재민,양재의,임경재,박윤식 한국지하수토양환경학회 2019 지하수토양환경 Vol.24 No.5

In 2013, the Ministry of Environment in South Korea promulgated a new regulatory bulletin that contained revisedenforcement ordinance on soil management protocols. The bulletin recommends the use of Universal Soil Loss Equation(USLE) for the soil erosion estimation, but USLE has limited applicability in prediction of soil erosion because it does notallow direct estimation of actual mass of soil erosion. Therefore, there is a great need of revising the protocol to allowdirect comparison between the measured and estimated values of soil erosion. The Korean Soil Loss Equation (KORSLE)was developed recently and used to estimate soil loss in two fields as an alternative to existing USLE model. KORSLEwas applied to estimate monthly rainfall erosivity indices as well as temporal variation in potential soil loss. The estimatedpotential soil loss by KORSLE was adjusted with correction factor for direct comparison with measured soil erosion. Theresult was reasonable since Nash-Stucliff efficiency were 0.8020 in calibration and 0.5089 in validation. The resultssuggest that KORSLE is an appropriate model as an alternative to USLE to predict soil erosion at field scale.

Free to Premium in Mobile TV Service: Intrinsic and Extrinsic Motivational Factors Affecting Free Users’ Paid Subscription Intention

송재민,류성한,김영걸 한국경영정보학회 2023 Asia Pacific Journal of Information Systems Vol.33 No.2

Mobile TV refers to the service that provides live broadcasting and video-on-demand content through a mobile device. In addition to the advertisement as the early-stage revenue model, the paid subscription model has emerged as a more sustainable revenue source for mobile TV services. In this study, with the surveys of 450 free mobile TV users, we examine the motivational factors influencing their intention to adopt a paid subscription model. Results show that three extrinsic motivations, price fairness, subjective norm, and mobile TV utilization, are positively associated with free users’ paid subscription intention. In contrast, intrinsic motivations, such as hedonic need, spatiotemporal convenience, and self-efficacy, have no significant influence on the intention. We also found that the expected value is positively associated with attitude toward mobile TV service, also positively influencing the paid subscription intention.

교통사고 예방을 위한 교통사고 원인 데이터 활용방안

송재민,김명수,최진,임효진 대한교통학회 2020 대한교통학회 학술대회지 Vol.83 No.-

10년 관찰기간 중 다수의 국소 재발을 보인 설암 환자

송재민,이성탁,이주민,송원욱,김용덕,김욱규,Song, Jae-Min,Lee, Sung-Tak,Lee, Ju-Min,Song, Won-Wook,Kim, Yong-Deok,Kim, Uk-Kyu 대한악안면성형재건외과학회 2013 Maxillofacial Plastic Reconstructive Surgery Vol.35 No.6

Locoregional recurrence of tongue cancer is higher than that of other sites of the oral cavity. Locoregional control has shown improvement over the past 20 years, however, a high rate of recurrence and second primary tumor occurrence is still frequently reported. Leukoplakia is a clinical term, which describes a whitish lesion of the oral cavity. Clinicopathologic features may range from hyperkeratosis to malignancy. Because of its diverse pathologic characteristics, management of this lesion for diagnosis, treatment planning, establishment of a clear surgical margin, and periodic follow-up is difficult. We report on a case of successfully treated tongue cancer which developed from leukoplakia over 10 years. Periodic follow-up strategy and surgical planning are most important to management of locoregional recurrence.

Parenteral, non-live rotavirus vaccine: recent history and future perspective

송재민 대한백신학회 2021 Clinical and Experimental Vaccine Research Vol.10 No.3

Since the widespread introduction of oral and live attenuated rotavirus vaccines around the world in 2009, the impacts of disease burden and the effects of disease reduction in developing countries have been proven. However, in low and middle-income countries, the vaccine efficacy is somewhat lower than in developed countries due to differences in nutritional conditions, microbial environments of individuals, and other factors. In addition, as oral, live vaccines have been found to be associated with rare but serious side effects, the development of a next-generation vaccine with safety, improved effectiveness, and ease of storage is currently underway. New vaccine strain developed by the Centers for Disease Control and Prevention in the United States are undergoing preclinical testing of efficacy, antigen dose, and administration route in the form of a heat-treated inactive vaccine, and a recombinant protein-based trivalent subunit vaccine developed by the Program for Appropriate Technology in Health is undergoing clinical trial in phase III. Several research groups are also developing non-replicating protein-based rotavirus vaccines using virus-like particles and nanoparticles. This review provides a brief overview of the development status and technology of parenteral, non-live rotavirus vaccines worldwide.

임베디드 시스템 기반 지능형 영상 감시 시스템 구현

송재민,김동진,정용배,박영석,김태효,Song, Jae-Min,Kim, Dong-Jin,Jung, Yong-Bae,Park, Young-Seak,Kim, Tae-Hyo 한국융합신호처리학회 2012 융합신호처리학회 논문지 (JISPS) Vol.13 No.2

본 논문에서는 NIOS II 임베디드 플랫폼을 기반으로 하는 지능형 영상 감시 시스템을 구현하였다. 지금까지의 입베디 드 기반의 영상 감시 시스템들은 하드웨어의 의존도가 높아 특정한 목적에 제한되는 단점이 있었다. 이러한 한계를 개 선하기 위하여, 필자들은 그 응용의 목적에 따라 폭 넓게 적용 가능한 유연성이 높은 임베디드 플랫폼을 구현하였다. 소프트웨어 중심 프로그래밍 기법의 주요 문제점인 고속 처리를 위하여, 핵심 부분인 하드웨어 플랫폼에서 SOPC형 NIOS II 임베디드 프로세서와 영상처리 알고리즘을 소프트웨어 프로그래밍과 C2H(The Altera NIOS II C-To-Hardware(C2H) Acceleration Compiler) 컴파일러를 사용하는 하드웨어 프로그래밍을 통합하여 시스템의 성능을 향상 시켰다. 그리고 NIOS II 임베디드 프로세서 플랫폼을 중심으로 각각의 디바이스 인터페이스를 통합 관리하는 서버 시스템을 구축하고, 사용자의 접근 효율을 높이기 위해 네트워크상에서 제어하는 기능을 추가하였다.본 시스템을 영상 감시를 위한 지정된 구역에 설치하여 시험하고 그 성능을 평가하였다. In this paper, an intelligent visual surveillance system based on a NIOS II embedded platform is implemented. By this time, embedded based visual surveillance systems were restricted for a special purpose because of high dependence upon hardware. In order to improve the restriction, we implement a flexible embedded platform, which is available for various purpose of applications. For high speed processing of software based programming, we improved performance of the system which is integrated the SOPC type of NIOS II embedded processor and image processing algorithms by using software programming and C2H(The Altera NIOS II C-To-Hardware(C2H) Acceleration Compiler) compiler in the core of the hardware platform. Then, we constructed a server system which globally manage some devices by the NIOS II embedded processor platform, and included the control function on networks to increase efficiency for user. We tested and evaluated our system at the designated region for visual surveillance.

초급성 허혈성 뇌졸중 환자에서 유로키나제를 이용한 국소적 동맥내 혈전용해술의 임상결과에 영향을 미치는 요인

송재민,윤웅,김재규,서정진,허숙희,박진균,정용연,강형근 대한영상의학회 2002 대한영상의학회지 Vol.47 No.4

Purpose: To evaluate the clinical outcome and other relevant factors in cases where local intra-aterial thrombolysis (LIT) is used for the threatment of hyperacute ischemic stroke. Materials and Methods: Forty-eight hyperacute ischemic stroke patients were treated by LIT, using urokinase, within six hours of ictus, and for evaluation of their neurological status, the National Institutes of Health Stroke Scale (NIHSS) score was used. Angiographic recanalization was classified according to Mori recanalization grades. Three months after LIT, the outcome was assessed by clinical examination using the modified Rankin scale (good outcome: RS=0-3; poor outcome: RS=4-6). In all patients, the findings of pre- and post-LIT CT, and angiography, as well as neurological status and hemorrhagic complications, were also analysed. Results: Thirty-three patients had occlusions of the middle cerebral artery (MCA), and 15, of the internal carotid artery (ICA). The NIHSS score averaged 16.9 at the onset of therapy and 13.5 at 24 hours later. Successful recanalization (Mori grade 3,4) was achieved in 28 (58.3%) of 48 patients, but in 20 (41.7%) the attempt failed. Twenty-two (45.8%) of the 48 patients had a good outcome, but in (54.2%) the outcome was poor. Thirteen (40.6%) of 32 patients with MCA occlusions and 13 (81.2%) of 16 with ICA occlusions had a poor outcome. Eight patients (16.7%) died. Overall, hemorrhages occured in 20 (41.7%) of 48 patients, with symptomatic hemorrhage in ten. Five (50%) of these ten died. Conclusion: LIT using urokinase for hyperacute ischemic stroke is feasible; patients with MCA occlusions had better outcomes than those with ICA occlusions. Hemorrhagic complications of LIT were frequent, and in cases of symptomatic hemorrhage a fatal outcome may be expected. 목적: 초급성 허혈성 뇌졸중 환자에서 국소적 동맥내 혈전용해술시 결과와 예후에 영향을 미치는 요인을 알아보고자 하였다. 대상과 방법: 뇌경색 증상 발현 6시간 이내에 유로키나제를 사용하여 국소적 동맥내 혈전용해술을 시행했던 초급성 허혈성 뇌졸중 환자 48명을 대상으로 하였다. 시술 전 환자의 신경학적 상태는 National Institutes of Health Stroke Scale(NIHSS) score를 측정하여 평가하였다. 시술 후 혈관조영상 폐색혈관의 재개통은 Mori 등급을 이용하여 분류하였고, 임상결과 판정은 혈전용해술 시행 3개월 후에 Modified Rankin scale(MRS)을 이용하여 0-3등급인 경우 만족, 4-6등급인 경우 불만족으로 분류하였다. 또한 모든 환자에서 혈전용해술 시행 전후의 전산화단층촬영과 혈관조영소견, 신경학적 상태 그리고 뇌출혈유무에 대해 분석하였다. 결과: 시술전 혈관조영상 중대뇌동맥의 폐색이 32명, 내경동맥의 폐색이 16명이었다. 시술전 평균 NIHSS score는 16.9였으며, 시술 24시간 후에 13.5였다. 성공적인 뇌혈관 재개통은 48명중 28명(58.3%)이었으며, 부분적인 재개통이나 재개통이 되지 않았던 경우는 20명(41.7%)이었다. 시술 후 임상결과는 48명중 22명(45.8%)에서 만족스런 결과를, 26명(54.2%)에서 불만족스런 결과를 보였다. 이중 중대뇌동맥 폐색이 있었던 32명중 13명(40.6%)과 내경동맥 폐색이 있었던 16명중 13명(81.2%)에서 불만족스런 결과를 보였다. 시술 후 3개월이내에 8명(16.7%)이 사망하였다. 48명중 20명(41.7%)에서 뇌출혈이 발생했고, 이중 10명은 증상을 동반하였으며, 증상이 있는 뇌출혈이 있었던 10명중 5명(50%)이 사망하였다. 결론: 초급성 허혈성 뇌졸중 환자에서 유로키나제를 이용한 국소적 동맥내 혈전용해술을 시행한 결과 중대뇌동맥의 폐색 환자가 내경동맥 폐색 환자에 비해 임상 결과가 좋았으며, 시술후 증상이 있는 뇌출혈의 합병증이 있었던 환자에서 치명적인 결과를 예측할 수 있었다.

간장의 횡격막 탈장에 의한 Budd-Chiari 증후군: 1예 보고

송재민,윤중원,김재욱,정우경,정희선,김주형,최준호,김승호 대한영상의학회 2007 대한영상의학회지 Vol.56 No.1

Budd-Chiari syndrome is an uncommon disorder, and it is caused by obstruction of the hepatic venous outflow or inferior vena cava above the hepatic vein. It may result from a large number of conditions, including primary congenital obstructions of the hepatic veins or inferior vena cava by webs or bands. Secondary causes include trauma, polycythemia vera, chronic leukemia, pregnancy, tumors and use of oral contraceptives. No definitive etiologic factors have been identified in two thirds of all cases (1-3). We recently experienced a case of Budd-Chiari syndrome caused by diaphragmatic hernia in 21-year-old man. Postoperative follow up CT showed normal venous flow after reintroduction of the liver into the abdominal cavity and closure of the diaphragm defect. Budd-Chiari 증후군은 드문 질환으로서 간정맥 또는 하대정맥의 위치에서 간정맥 유출의 폐쇄를 특징으로 하는 여러 질병을 포함하여 통칭하는 질환이다. 원인으로는 일차성으로 막과 밴드에 의한 선천성 간정맥 유출의 폐쇄와 이차성으로 종양에 의한 간정맥 침범 또는 압박, 외상, 임신, 경구 피임제, 만성백혈병 등을 들 수 있으나 최근에 영상학적 진단의 발달에도 서구에서는 아직도 2/3 정도는 원인 미상으로 보고되고 있다(1-3). 임상증상으로 간비대, 복통, 복수 등이 관찰될 수 있으나 항상 관찰되는 것은 아니며 흔히 비특이적 간문맥압 상승, 황달, 정맥류 출혈을 보일 수 있다(1, 2). 저자들은 최근 간장의 횡격막 탈장에 의한 Budd-Chiari 증후군 1예를 경험하였고 이는 국내외적으로 드물게 보고되고 있어 흉부사진과 전산화단층촬영 소견을 보고하는 바이다.

CDR을 사용한 FPGA 기반 분산 임베디드 시스템의 클록 동기화 구현

송재민,정용배,박영석,Song, Jae-Min,Jung, Yong-Bae,Park, Young-Seak 대한임베디드공학회 2017 대한임베디드공학회논문지 Vol.12 No.4

Time synchronization between distributed embedded systems in the Real Time Locating System (RTLS) based on Time Difference of Arrival (TDOA) is one of the most important factors to consider in system design. Clock jitter error between each system causes many difficulties in maintaining such a time synchronization. In this paper, we implemented a system to synchronize clocks between FPGA based distributed embedded systems using the recovery clock of CDR (clock data recovery) used in high speed serial communication to solve the clock jitter error problem. It is experimentally confirmed that the cumulative time error that occurs when the synchronization is not performed through the synchronization logic using the CDR recovery clock can be completely eliminated.