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수도권 신도시 인구이동 특성에 관한 연구: 안산, 분당 신도시를 중심으로
宋英燮,崔乃永,李東奎 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
This study delves into the two typical new towns-Ansan, an industrial town, and Bundang, a redidential town in an effort to analyze the macroscopic reasons for the migratin of population within the Seoul metropolitan area, and the microscopic reasons for the migration of individuals, by way of descriptive statistics and in-depth questionnaire surveys. With regards to the macroscopic reasons for the inter-regional migration of population within the metropolitan area, the study has found that the population sizes and the travel distances are the utmost important factors as well as incomes and economic factors among others. With regards to the microscopic reasons for the migration of individuals, on the other hand, investments related to home and work have been found to be the strongest factors for the case of Ansan, whereas the residential environment and the housing attributes have been found to be the dominant factors in the case of Bundang. In addition, the analysis on the characteirstics of families with regard to their future demand for migration indicates that office workers, engineers, and generally higher-income groups wish to move to the Ansan area, whereas retail service workers, freelancers, professionals, and lower-income groups wish to migrate to the Bundang area. Economic reasons also show significant relevance to these factors. In this cotext, the future development of new towns in the greater Seoul metropolitan area seems to require distinct policies for the residential- and industrial towns, respectively, and also require stronger political commitments to retain stable number of population in the new towns.
Changes in Urinary and Sexual Function 6 Months after Cystocele Repair with a Polypropylene Mesh
Lee, Dong Sup,Park, Dong Choon,Choe, Hyun-Sop,Choi, Jin Bong,Lee, Seung-Ju S. Karger AG 2012 UROLOGIA INTERNATIONALIS Vol.88 No.4
<P>Abstract</P><P><B><I>Introduction:</I></B> We used quantitative parameters obtained during the voiding phase, urinary symptoms and sexual functioning to investigate the symptomatic and functional changes after cystocele repair with a polypropylene mesh. <B><I>Patients and Methods:</I></B> The maximum urinary flow rate (Q<SUB>max</SUB>), residual urine (RU) volume and two symptom questionnaires, the Urinary Distress Inventory (UDI-6) and the Female Sexual Function Index (FSFI), were used to retrospectively evaluate 39 consecutive cystocele patients before and 6 months after surgery. <B><I>Results:</I></B> Q<SUB>max</SUB>, RU and FSFI were not significantly different (p = 0.366, 0.286 and 0.100, respectively) pre- and postoperatively, but the UDI-6 score had significantly improved (p < 0.001) 6 months after the cystocele repair. A concomitant sling procedure was significantly correlated with changes in the UDI-6 score (p < 0.001); the patients without stress urinary incontinence (SUI) who underwent cystocele repair only showed no symptomatic improvements in the UDI-6 score (p = 0.560). <B><I>Conclusions:</I></B> Correction of SUI resulted in urinary symptom improvement in cystocele patients. Cystocele repair with or without sling placement did not change Q<SUB>max</SUB>, RU or sexual functioning at the 6-month follow-up.</P><P>Copyright © 2012 S. Karger AG, Basel</P>
空力學 週期를 이용한 負壓 터빈: 대형산업용 비등가속 原自力 발전기
이동건(Dong Geon Lee),주남식(Nam Sik Joo),김동섭(Dong Sop Kim),지인호(In Ho Jee),서균렬(Kune Yull Suh) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
Electricity has been generated first time ever on the face of the planet by filling a tank with 200 liters of water roughly 15 m above the floor so as to generate a natural vacuum for the so-called BIG BANG for Big Industry Grade Boiling Accelerated Naturalistic Generator. A turbine and a generator were installed in the supercooled Torricelli vacuum chamber created on top of about 10.3 m high water column. With a 20 mm polyethylene pipe, a 6 mm glass pipe nozzle and a pressure gauge ready to go, a vacuum space was produced by use of a bypass line to discharge air into the suction pipe to kick off the proof-of-principle test for the BIG BANG setup. The boiling accelerated two-phase mixture of gas and liquid phases formed in the nozzle region is considerably cooled down in the vacuum and passed down to drive the turbine whereby generating electricity. When boiling is accelerated by difference between the atmospheric and ultra low, or almost vacuum, pressures, the working fluid’s thermophysical properties vary sizably from the liquid phase to two-phase mixture of liquid and vapor/gas phases. Specifically, its temperature plummets, specific volume soars, and thus its flow velocity picks up dramatically. This first-of-a-kind engineering endeavors to seek big industry grade fluid machinery to convert this fluid’s kinetic energy into mechanical energy of the turbine rotor all the way to electrical energy resorting to ecological, naturalistic, renewable, reusable, recyclable resources for the benefit of mankind.
전력 SCADA 시스템의 사이버 보안 위험 평가를 위한 정량적 방법론에 관한 연구
강동주(Dong-joo Kang),이종주(Jong-joo Lee),이영(Young Lee),이임섭(Im-sop Lee),김휘강(Huy-kang Kim) 한국정보보호학회 2013 정보보호학회논문지 Vol.23 No.3
본 논문은 제어시스템에서 사이버 위협과 취약성을 평가하기 위한 정량적 모델링에 관한 연구이다. SCADA(supervisory control and data acquisition) 시스템은 대표적인 제어시스템이고 전력계통에서 가장 큰 규모를 형성하고 있다. SCADA 시스템은 초기에는 지역적으로 고립된 시스템이었으나 통신 및 제어기술이 발전하면서 광역으로 확대되어 왔다. 스마트그리드는 에너지 시스템과 IT 시스템을 통합하는 것이며, 이러한 통합의 과정에서 IT 시스템 상에서 존재하던 위협이 제어시스템으로 옮겨오게 된다. 전력시스템은 실시간 특성이 강하게 요구되며, 이는 전력시스템의 사이버 위협을 IT 시스템에 비해 보다 복잡하고 치명적으로 만드는 요인이 된다. 예를 들어, 기밀성이 IT 시스템에서 가장 중요한 요소인데 반해 가용성은 제어시스템에서 가장 중요한 고려 사안이다. 이러한 맥락에서, 보다 체계적인 방식으로 전력시스템의 사이버 위험을 평가하는 과정이 요구된다. 일반적인 관점에서 위험이란, 위협, 취약성, 자산의 곱으로 산출되며 본 연구는 전력시스템 구성요소 별로 위험을 정량적으로 분석할 수 있는 프레임워크를 제안한다. This paper is about the study to build a quantitative methodology to assess cyber threats and vulnerabilities on control systems. The SCADA system in power industry is one of the most representative and biggest control systems. The SCADA system was originally a local system but it has been extended to wide area as both ICT and power system technologies evolve. Smart Grid is a concept to integrate energy and IT systems, and therefore the existing cyber threats might be infectious to the power system in the integration process. Power system is operated on a real time basis and this could make the power system more vulnerable to the cyber threats. It is a unique characteristic of power systems different from ICT systems. For example, availability is the most critical factor while confidentiality is the one from the CIA triad of IT security. In this context, it is needed to reflect the different characteristics to assess cyber security risks in power systems. Generally, the risk(R) is defined as the multiplication of threat(T), vulnerability(V), and asset(A). This formula is also used for the quantification of the risk, and a conceptual methodology is proposed for the objective in this study.
다중벽 탄소나노튜브를 함유한 PC/ABS 복합재의 마모 특성 및 다중벽 탄소나노튜브의 유출 평가
이현우(Hyun-Woo Lee),김경식(Kyung-Shik Kim),이재혁(Jae-Hyeok Lee),김효섭(Hyo-Sop Kim),김재호(Jae-Ho Kim),오동훈(Dong-Hoon Oh),류상효(Sang-Hyo Ryu),장영찬(Young-Chan Jang),김재현(Jae-Hyun Kim),이학주(Hak-Joo Lee),김광섭(Kwang-Seop Kim 한국트라이볼로지학회 2014 한국윤활학회지(윤활학회지) Vol.30 No.5
Carbon nanotubes (CNTs) are used in various composite materials to enhance electrical, thermal and mechanical properties of composite materials. In this study, we investigate the wear characteristics of polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends containing multi-walled carbon nanotubes (MWCNTs). PC/ABS blends are commonly used in many industrial applications such as cellular phones and display cases and MWCNTs have been added to the PC/ABS blends to improve their electromagnetic interference shielding (EMS). We performed wear tests on PC/ABS blends containing MWCNTs under reciprocating linear sliding conditions with chrome steel balls as a counterpart material. The normal loads were 10, 30, 50, 70, 100 N, the sliding speed was 10 mm/s, the stroke length was 15 mm, and the tests lasted 900 s. The MWCNTs included in the PC/ABS blends lower the wear volume and friction coefficient of the composites. We analyzed the wear debris collected from the composites during the tests in terms of the MWCNT concentration using inductively coupled plasma optical emission spectroscopy. The results show that the quantity of MWCNTs in the debris is proportional to the concentration of MWCNTs in the composite, indicating that the exposure of the MWCNTs to environments by wear could be increased with their concentration in the composite.
( Sang Il Kim ),( Joo Hee Yoon ),( Dong Choon Park ),( Sung Jong Lee ),( Jin Hwi Kim ),( Tae Chul Park ),( Dong Sup Lee ),( Seung Ju Lee ),( Hyun Sop Choe ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Objective: This study aimed to determine the role of asymptomatic bacterial sexually transmitted infections (STIs), such as Chlamydia trachomatis (Ct), Mycoplasma genitalium (Mg), Mycoplasma hominis (Mh), and Ureaplasma urealyticum (Uu) in human papillomavirus (HPV) infection. Methods: In total, 264 asymptomatic outpatients aged between 21 and 80 years were prospectively enrolled in this study during routine gynecological screening tests. Specimens collected with a Cervex Brush were routinely analyzed with the Hybrid Capture 2 assay for HPV. Simultaneously, a specimen obtained with an endocervical swab was used to detect Ct and Mg with a monoplex real-time polymerase chain reaction (PCR) and to confirm Mh and Uu with a Mycoplasma IST 2 kit. Results: The detection rates (%) of HPV, Ct, Mg, Mh, and Uu were 82/264 (31.1), 6/264 (2.3), 5/264 (1.9), 16/264 (6.1), and 95/264 (36.0), respectively. Of 95 Uu, 32 (33.7%) showed high density colonization (HDC, 104 color-changing units/mL). HDC-Uu was significantly associated with HPV infection (p=0.014, chi-square test). Mg infection and Mh infection were not associated with HPV infection (p=0.981 and p=0.931, chi-square test). Age was not associated with HPV infection or bacterial infection. Conclusion: Our data suggested that asymptomatic HDC-Uu was closely associated with HPV infection. Therefore, simultaneous evaluation for Uu and HPV should be performed during gynecological screening, even in asymptomatic individuals. Acknowledgements: This research was supported by a grant of the Korea Health Technology R&D Project under the Korea Health Industry Development Institute (KHIDI), funde