구한말~일제하 여성早婚의 실태와 早婚廢址社會運動

류승현 동선사학회 1998 성신사학 Vol.16 No.-

Establishment of a mouse model of 70% lethal dose by total-body irradiation

류승현,박종형,정의숙,최수영,함승훈,박진일,전희연,김준영,유란지,이용진,우상근,최양규 한국실험동물학회 2016 Laboratory Animal Research Vol.32 No.2

Whereas increasing concerns about radiation exposure to nuclear disasters or side effects of anticancer radiotherapy, relatively little research for radiation damages or remedy has been done. The purpose of this study was to establish level of LD70/30 (a lethal dose for 70% of mice within 30 days) by total-body γ irradiation (TBI) in a mouse model. For this purpose, at first, 8-week-old male ICR and C57BL/6N mice from A and B companies were received high dose (10, 11, 12 Gy) TBI. After irradiation, the body weight and survival rate were monitored for 30 days consecutively. In next experiment, 5-week-old male ICR and C57BL/6N mice from B company were received same dose irradiation. Results showed that survival rate and body weight change rate in inbred C57BL/6N mice were similar between A and B company. In ICR mice, however, survival rate and body weight change rate were completely different among the companies. Significant difference of survival rate both ICR and C57BL6N mice was not observed in between 5-weekold and 8-week-old groups receiving 10 or 12 Gy TBI. Our results indicate that the strain and age of mice, and even purchasing company (especially outbred), should be matched over experimental groups in TBI experiment. Based on our results, 8-week-old male ICR mice from B company subjected to 12 Gy of TBI showed LD70/30 and suitable as a mouse model for further development of new drug using the ideal total-body irradiation model.

Part 23 급 항공기 엔진인증 비행시험 절차 조사

류승현,박영훈,문희장,Ryoo, Seung-Hyun,Park, Young-Hoon,Moon, Hee-Jang 한국항공운항학회 2017 한국항공운항학회지 Vol.25 No.1

The engine is the most significant and essential part of the aircraft. As a result, systematical handling in the aircraft development stage is required from engine design to implementation to the full-scale airframe. This survey demonstrates the procedures demanded by the KAS 23 Civil Aircraft to acquire the engine Type Certification and the flight test procedures for ensuring the operational stability. Surveys were conducted on domestic and international aircraft engine certifications, technical regulations and documentations related to the Means of Compliance for flight test development stage. In addition, organized reference items that should be considered for the certification of engine flight test procedures were reviewed based on the KC-100.

유전자 알고리즘을 이용한 도심지하저류조 최적위치와 규모 선정

류승현,이정호 한국방재학회 2012 한국방재학회논문집 Vol.12 No.3

Recently, the danger of flooding has increased due to the result of extreme climate change and urbanization around the metropolitan areas. To prevent this kind of problems, installing underground retaining facility around the metropolitan basin has been discussed. Even though the several researches related to the underground retaining facility are on progress, the general consideration of the capacity and the location is unsatisfying. Therefore, this research has developed an optimal model which would help to decide an adequate capacity and location according to the numbers of the facilities that need to be installed. For this optimal technique, genetic algorithm is utilized, and SWMM(Storm Water Management Model) 5.0 DLL is constructed accordingly for the better interpretation of hydraulic, hydrological. The model has been simulated in Sungnae district in Seoul, and it has determined the adequate capacity and the location according to the different numbers of the facilities which need to be installed. Furthermore,by adapting various situations of exceeding rainfall, it has also analyzed the method of reducing inundation while installing the underground retaining facilities. 최근 기후변화 및 도시화로 인한 도시유역의 침수위험은 증가하고 있으며, 이를 저감하기 위한 방법으로 도시유역 내 지하저류조 설치가 논의되고 있다. 이에 따라 도시유역에서의 지하저류조와 관련된 연구들이 진행되고 있으나, 저류조 용량 및 위치의문제를 종합적으로 고려하는 연구는 아직 미진한 상태이다. 따라서 본 연구에서는 지하저류조 설치 시 시설 가능 개수에 따른지하저류조 최적위치 및 규모 선정을 동시에 고려할 수 있는 최적화 모형을 개발하였다. 이를 위한 최적화 기법으로는 유전자알고리즘(Genetic Algorithm)을 이용하였으며, 수리·수문 해석을 위하여 대표적 도시유출 해석 모형인 SWMM(Storm Water Management Model) 5.0 DLL을 연계 구성하였다. 개발된 모형은 서울시 성내분구에 모의 적용되었으며, 지하저류조 설치 가능 개수를 변화시켜 가면서 각각의 경우에 따른 최적의 위치 및 규모를 결정하였다. 또한 다양한 초과강우사상을 적용하여 개발 모형을 이용한 지하저류조 설치 시의 침수 발생 저감 효과를 분석하였다.

도시배수시스템의 효율적 운영을 위한 모니터링 지점선정

류승현,박무종,이정호,Ryu,Seung Hyun,Park,Moo Jong,Lee,Jung Ho 한국방재학회 2012 한국방재학회논문집 Vol.12 No.4

도시화가 진행됨에 따라 토지이용변화와 도로 포장률의 증가 등으로 인해 불투수성 면적이 확대되어 도시유출에 있어 유출량 증가 및 도달시간 단축 등 내수 침수의 위험성이 가중되고 있다. 도시지역 내에는 이러한 내수증가에 대처하기 위해 유수지 및 배수펌프장이 많이 건설되어 있거나 계획되어 있다. 따라서 최근 유수지의 저류용량과 배수펌프의 운영조작에 대한 적절한 운영의 중요성이 대두되고 있는데, 이는 동일한 설계조건을 가진 유수지에서도 배수펌프 운영조작 기법에 따라 내수피해의 정도가 증감될 수 있기 때문이다. 따라서 본 연구에서는 배수펌프장의 효율적인 운영을 위한 도시유역 하수관거 내 모니터링 지점선정에 대한 방법을 제시하였다. 이것은 우수관망 상류 지점에서의 유량 모니터링을 통하여 유수지 유입량을 예측하고, 또한 이를 통하여 펌프를 조기에 가동한다면 토출 효율을 향상시켜 내수침수 위험을 감소시킬 수 있다는 것에 기인한다. 제시된 모니터링 지점 선정 모형은 엔트로피 방법과 선형회귀식을 이용하여 각 지점들에서 유출과 유출구까지 도달시간을 고려한 모니터링 지점선정 방법을 제안하고 있다. 검증결과 제안한 방법을 사용하여 선정된 모니터링 지점에서 안정적으로 유출구의 유출을 예측할 수 있는 것으로 나타났다. 유출 변동이 예측되므로써 기존의 유수지 수위만을 기준으로 한 펌프운영 방법보다 좀 더 효과적인 새로운 펌프 운영 기법의 개발이 가능할 것으로 기대된다. As the urbanization proceeds, the extent of impermeability has expanded due to the increase of land use changes and pavement percentage of the road. These facts have aggravated the danger of inundation such as the increase of urban efflux and the decrease in time of reaching permissible range. To handle the increasing amount of inundation, numbers of retarding basins and drainage pump stations are already constructed or under contemplation in the urban areas. Consequently, due to the fact that the damage caused by the inundation might fluctuate according to the technique of drainage pump operation, the importance of appropriate management in detention storage and drainage pump system has aroused, despite of the identical constructional condition of the retarding basins. However, this may work effectively when the efflux from the upper stream is predicted and the pump is activated beforehand. Therefore, for more effective management of drainage pump stations, the following research provides the method of selecting an adequate monitoring spot in the sewer system for the urban basins. Utilizing the entropy methods and linear regressions, the model provided below suggests a method of selecting monitoring spots considering the efflux of each basins and the concentration time to the outlet.

국내 기존 학교건축물의 내진보강 후 비선형 거동특성

류승현,윤현도,김선우,이강석,김용철 한국구조물진단유지관리공학회 2011 한국구조물진단유지관리공학회 논문집 Vol.15 No.1

본 논문은 내진설계규정이 적용되지 않은 국내 철근콘크리트 학교 건물에 관한 해석적 연구이다. 일본의 내진진단과 비선형정적 및 동적 해석을 통하여 대상 건축물의 내진 성능을 평가하였다. 일본의 내진진단 방법에 기초하여 철근 콘크리트 학교 건물의 부족한 내진 성능을 파악하였다. 또한, 횡하중을 받는 학교 건물의 내진거동이 해석적으로 평가되었다. 건축물의 내진 보강을 위하여 1,300kN의 내력을 받는 전단벽과 K형 가새골조가 사용되었다. 비선형 정적해석 결과, 보강에 의한 전단내력은 보강 전에 비하여 30%이상의 향상을 보이는 것으로 나타났으며, 전단벽 보강 시 최대 하중 이후에서 가새골조 보강에 비해 큰강성저하를 나타내었다. 또한, 성능점 산정 결과에서 가새골조로 보강된 건축물이 전단벽으로 보강된 건축물에 비해 30% 이상의 변형능력을 보였다. 한편 비선형 동적해석의 시간이력해석 결과에서는 가새골조와 전단벽에 의해 보강된 건축물의 최대 변위가 보강량이 증가할수록 감소하는 경향을 나타내었다. 본 연구는 이 외에도 지진 지역에서의 건축물의 내진성능 향상을 위해다양한 지반 조건과 지진파를 고려되어야 한다고 판단된다. This paper describes an analytical study on seismic performance of domestic reinforced concrete (RC) school building not designed by seismic provision. The seismic index and the seismic performance of the building were evaluated through Japanese standard and Midas Gen, respectively. Seismic index (Is) of the RC school buildings in the X-direction is below 0.4. Based on the seismic index, for seismic-strengthening the building, infill shear wall or steel brace with a capacity of 1,300 kN was used. According to nonlinear static analysis results, the contribution of the seismic-strengthening to the shear resistance of the school building was measured to be greater than 30%. However, as expected, shear strength of school building strengthened with infill wall dropt rapidly after peak load and much narrower ductile behavior range was observed compared to steel brace strengthened building. Also, the building strengthened with steel brace showed 30%larger spectral displacement than that strengthened with infill shear wall. In nonlinear dynamic analysis, for the time history analysis, the maximum displacement showed tendency to decrease as amount of reinforcement increased,regardless of strengthening method. It was recommended that variable soil properties and earthquake record should be considered for improving seismic performance of buildings in seismic zone.

유기성 폐기물처리 및 자원화 : 메탄생성 효율증진을 위한 가축분뇨 전처리 방법 연구 1 -물리화학적 처리에 의한 입도분포 변화 고찰-

류승현,김창현,정광화,남궁규철 한국폐기물자원순환학회(구 한국폐기물학회) 2010 한국폐기물자원순환학회 추계학술발표논문집 Vol.2010 No.-

CSA계 팽창재 종류 및 대체율에 따른 섬유보강 시멘트 복합체의 역학적 특성

류승현,김종필,이영오,윤현도,Ryu, Seung-Hyun,Kim, Jong-Pil,Lee, Young-Oh,Yun, Hyun-Do 대한건축학회 2011 대한건축학회논문집 Vol.27 No.6

This paper discusses the results of an investigation on the influence of calcium sulfoaluminate (CSA) based expansive admixtures (EXA) on the mechanical and cracking properties of fiber-reinforced cement-based composite (FRCC). The specific compressive strength of FRCC matrix was 70 MPa and this FRCC matrix was reinforced with 1.5% polyethylene fibers (PE) by volume fraction. Two independent variables such as EXA type (Type-1 and Type-2) and percentages of EXA as cement replacement (0, 8, 10, 12 and 14% by mass) were used for the design of FRCC mixtures. The mechanical properties of FRCC such as uniaxial tensile, flexure, and compressive properties, as well as crack development and shrinkage behavior were evaluated to examine the effects of EXA on the performance of FRCC. The results indicated that 8 to 10% replacement of EXA could significantly increase compressive, flexural and tensile strength of FRCC manufactured in this study. In addition to its efficient shrinkage reducing effect, it was observed that 8 to 10% of EXA content decreased initial shrinkage cracking and induced multiple and narrow cracks in the FRCC specimen under flexure and direct tension properties.

학생발명 진흥사업의 성과관리 및 성과지표 개발을 위한 기초연구

류승현,김준한,이광호,이한규,한지영 한국기술교육학회 2009 한국기술교육학회지 Vol.9 No.1

The Purpose of this study was to develop the performance management and index on the invention promotion projects for student. In order to achieve the purpose, literature review and professional conference were used. This study has analyzed on 17 invention promotion projects for student by 3 institutions, that is, International Intellectual Property Training in Institute Korea Intellectual Property Office, Korea Intellectual Property Service Center, and Korea Association for School Invention. All projects categorized into three such as education, support, selection based on the goals and operation conditions. In the result of this study, logic model and performance index were chosen for three project traits. This study will give a fundamental frame to manage all projects for increasing effectiveness and decreasing doubleness. 학생발명 진흥사업은 미래 지식기반사회의 주역이 될 발명꿈나무의 무한한 잠재능력을 일깨우고, 우리의 미래를 짊어지고 나갈 우수 발명인력 발굴 및 양성을 위해 꾸준히 양적ㆍ질적으로 성장해 왔지만 사업의 성과를 구체적으로 측정하기 위한 노력은 부족한 실정이었다. 본 연구에서는 현재 특허청 국제지식재산연수원의 창의발명교육과, 한국학교발명협회, 한국발명진흥회 3개 기관에서 운영하고 있는 17개 관련 사업의 현황을 분석하고, 학생발명 진흥사업의 효과적인 성과관리 방안과 성과지표 개발을 위해서 다양한 선행연구를 분석하였다. 이러한 분석내용을 기초로 사업 성격에 따른 논리모형과 성과지표를 선정하였고, 이를 바탕으로 학생발명 진흥사업의 각 사업별 중복성을 피하고 효율성을 증대할 수 있는 성과관리 방안을 마련할 수 있는 연구의 기틀을 제공하였다.

한국인 조현병 환자에서 클로자핀 처방용량과 혈중농도의 관계 및 이에 영향을 미치는 요인에 관한 연구

류승현,조경형 대한조현병학회 2023 대한조현병학회지 Vol.26 No.2

Objectives: Some reports suggest that the concentration-to-dosage ratio (C/D ratio) of clozapine (CZP) in Asian treatment-resistant schizophrenia (TRS) patients differs from that of Caucasian TRS patients. However, there is insufficient research on the differences in C/D ratio between Korean TRS patients and Caucasian TRS patients. Therefore, this study aimed to investigate prescribed CZP dosage, CZP concentration and C/D ratio in Korean TRS patients.Methods: The study included TRS patients aged 18 years or older who were prescribed CZP for at least 12 weeks at a psychiatric hospital in Korea. We collected demographic information, smoking status, hospitalization status, CZP serum concentration, total CZP dosage, and norclozapine (NCZP) serum concentration and analyzed their statistical correlations.Results: The study found that the average daily CZP dosage was 266.1 mg, and the average CZP concentration was 568.0 ng/mL. There was a significant correlation between CZP serum concentration and smoking status, as well as sex. CZP dosage was not significantly associated with age, weight, BMI, or metabolic rate. The study also found a significant difference in C/D ratio between groups based on CZP serum concentration.Conclusion: Our study suggests that recommended CZP dosages for Caucasians may not be suitable for Koreans due to C/D ratio differences. We found a relationship between CZP serum concentration and C/D ratio in Korean TRS patients. Therefore, it is crucial to confirm CZP serum concentration to avoid side effects and to find optimal dosage.