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.

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.

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.

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.

환절기 탈모원인과 예방 및 치료법

류승현,Ryu, Seung-Hyeon 기술표준원 2004 기술표준 Vol.27 No.-

극초음속미사일 위협 감소를 위한 대응 전략

류승현,김동진,김문국 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.6

Hypersonic missile is a weapon that can fly at a high speed of Mach 5 or more and perform rapid maneuvering simultaneously. So, a hypersonic missile is a high-tech weapon, and counterstrategies for this missile are difficult to come up with, even with an advanced missile defense system. And only Russia, China, and the U.S. have succeeded in developing a missile defense system for hypersonic missiles. Recently, global attention and South Korean national security issues in the context of hypersonic missiles have been growing due to media reports on North Korea claiming to have succeeded in developing hypersonic missiles and Russia launching hypersonic missiles in the real war. However, these media reports also contain somewhat unclear and speculative information about hypersonic missiles. In any case, it is necessary to clearly face the reality and threat factors of hypersonic missiles to cope with these missiles. Therefore, we systematically organize various information related to hypersonic missiles and present countermeasures for these missiles considering the military situation in Korea in this article. First, we present the definition and classification of hypersonic missiles and the status of missile defense systems in developed countries. Further, we present the understanding of why hypersonic missiles are more threatening compared to other missiles and what is the current situation of the missile defense system of South Korea. Finally, we use the understanding of this current situation and perform an analysis of the status of missile defense systems in developed countries to present the counterstrategies and implications for reducing the threat of hypersonic missiles. 극초음속미사일은 마하 5 이상의 빠른 속도로 비행하며 동시에 급격한 변칙기동이 가능한 무기로써, 현재의 선진 미사일 방어체계로 대응이 어렵고 개발에 성공한 국가가 러시아, 중국, 미국에 불과할 정도로 개발 난이도가 높은 첨단 무기체계이다. 최근에는 북한의 극초음속미사일 개발성공 주장, 러시아의 극초음속미사일 실전 발사 언론보도 등에 따라 전 세계적인 관심과 안보적 이슈가 더욱 더 커지고 있는 상황이다. 하지만 이러한 언론보도는 극초음속미사일에 대한 다소 불명확하고 추측성의 정보들도 포함하고 있다. 극초음속미사일 위협에 대응하기 위해서는 극초음속미사일 실체와 위협요인들을 명확하게 직시할 필요가 있다. 따라서 본 논문에서는 극초음속미사일 관련 여러 가지 정보들을 체계적으로 정리하고 이를 기반으로 우리나라 군사적 상황에 적합한 극초음속미사일 대응전략에 대해 제시하고자 한다. 먼저 극초음속미사일의 정의 및 분류를 시작으로 선진국의 개발현황에 대해 정리하고, 타 미사일과 비교하여 극초음속미사일이 왜 더 위협적인지, 그리고 우리나라 미사일 방어체계의 현 상황은 어떤지에 대해 파악하고 최종적으로 현 상황과 선진국의 미사일 방어체계 현황 분석을 통해 극초음속미사일 위협을 감소시킬 수 있는 대응전략 및 시사점을 제시하였다.

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.

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.

국내산 콩과 수입콩의 Isoflavone, Phytic Acid 및 Oligosaccharides 함량

류승현,김성란,김경탁,김성수 한국식품영양학회 2004 한국식품영양학회지 Vol.17 No.2

Chemical composition, total dietary fiber(TDF), oligosaccharide, isoflavone and phytic acid contents of seven domestic and three imported soybean cultivars were determined. TDF contents were ranged from 16.83 to 21.71%(w/w) without remarkable differences among soybean cultivars. Phytic acid contents of domestic cultivars such as Geomjongkong 1(3.02%) and Dawonkong (2.92%) were higher than imported ones such as Canadian (2.07%) and American (2.22%) soybeans for soybean sprout and US No. 1 (2.16%). The phytic acid contents of cotyledon parts were 1.5 to 2 times higher than those of hypocotyl parts. Isoflavone contents in whole seed were wide ranged from 371 to 2,398 ㎍/g among cultivars and it were existed mainly as glucoside isomers. Profiles of isoflavone aglycones were composed of 52% genistein, 36% daidzein and 11% glycitein. Hwanggumkong, Dawonkong, Geomjongkong 1 and American soybean for sprout contained lower isoflavone than others. Hypocotyl parts of soybeans contained from 6120.1 to 16921.1 ㎍/g isoflavone with ratio of 48% glycitein, 35% daidzein and 10% genistein. Isoflavone contents of cotyledon parts were ranged 375~2393 ㎍/g, composition of which had no glycitein, 55% genistein and 38% daidzein. Oligosaccharide contents were similar among cultivars. Stachyose of 3.0~3.9%, raffinose of 0.8~1.2%, sucrose of 4.5~7.8% and fructose of 0.3~0.8% were determined.