무역전시회를 통한 관계학습이 관계성과에 미치는 영향 - 2008 국제자동화정밀기기전을 중심으로

박명섭,장동현 釜山 大學校 經營 經濟 硏究所 2009 經營 經濟 硏究 Vol.28 No.2

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.

忠南 養豚産業의 現況과 市 郡別 特化係數에 의한 類型 區分

金東燮,韓昇熙 公州大學校 産業開發硏究所 1996 産業開發硏究 Vol.4 No.-

The objective of this study is to obtain the knowledge of the situation of hog-breeding industry and the degree of production-specialization based on 15 municipalities and counties in Chungchongnam-do province. The results are as follows: Firstly, the hog-breeding industry in the Province has increased steadily and after 1990, it was shown that the number of hogs and hog farms are outnumbered as 19.1%, 31.5% respectively compared with those of the whole country in 1995. But average hogs per farm are 67, compared with Kyeonggie-do Province(177) and Jaeju-do Province(461). Therefore, it can be drawn that the hog-breeding industry in the Province turns out to be a small business and has an inefficient structure. Secondly, as the estimates of a co-efficient of production-specialization, the characteristics of the degree of collectivization of hog-breeding, that of Hongsung county is 4.59, the most collective region in the Province, Dangjin county 2.79, Cheonan city 2.05 and so on. Thirdly, based on the degree on production-specialization, this study has divided the municipalities and counties into 3 groups and made comparison of them. They are i) the deep-specialized regions are 2 counties including Cheonan city, ii) the specialized regions Kongju city including 6 municipalities and counties, iii) the non-specialized regions Taean county including 5 municipalities and counties.

Applications of Unmanned Aerial Vehicles in Fluvial Remote Sensing: An Overview of Recent Achievements

Dong Sop Rhee,김영도,강부식,김동수 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.2

Previously, understanding of the fluvial process from the ecological, morphological, and hydrodynamic perspectives has largely relied on the limited scale of in-situ field observation or the sparse spatial and temporal scale of satellite-based remote sensing. However, with the recent advent of unmanned aerial vehicles (UAVs) and concurrent advances in sensor technology, measurement campaign has been revolutionized and the view of rivers has fundamentally changed from the local scale to the holistic scale; the perspective has shifted from a static to a dynamic one. UAVs can provide a fine spatial and temporal resolution of measurements with a relatively low cost, which, as compared to conventional satellite or pilot-controlled airborne systems, can be more suitable for the analysis of fluvial processes in narrow rivers and small lakes. In this paper, we comprehensively review and document various crucial achievements driven by UAVs-based remote sensing in fluvial environments, among a variety of other relevant applications. Specifically, the paper highlights the UAV-based fluvial remote sensing in terms of riparian vegetation, hazardous aquatic algae blooms, submerged morphology, water-surface slope, sediment, flow velocity, and disasters, including flood inundation mapping.

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>

임계 마름 수심기법을 이용한 지하공간 침수 모의

이동섭 ( Dong Sop Rhee ),김형준 ( Hyung Jun Kim ),송창근 ( Chang Geun Song ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.6

In this study, a 2D hydrodynamic model equipped with critical dry depth scheme was developed to reproduce the flow over staircase. The channel geometry of hydraulic experiment conducted by Ishigaki et al. was generated in the computational space, and the developed model was validated against flow properties such as discharge, velocity and momentum. In addition, the water surface profile and the velocity distribution evolved in flow over two layers staircases were analyzed. When the initial water depth at the upper floor was 0.3 m, the maximum velocity at lower floor was 4.2 m/s, and the maximum momentum was 1.2 m3/s2, and its conversion to force per unit width was 1.2 kN/m. This value was equivalent to the hydrostatic force with 50 cm water depth, and evacuation became difficult, as proposed by Ishigaki et al.1) For the flow over staircases connecting two layers, the maximum run-up height in flat part connecting two layers was approximately two times higher than the initial water depth in upper floor, and the rapid shock wave with sharp front and long tail was propagated.

Numerical Computation of Rapid Flow over Steep Terrain Using Total Acceleration Method

Rhee, Dong Sop,Lyu, Si Wan,Song, Chang Geun BioOne (Coastal Education and Research Foundation) 2018 JOURNAL OF COASTAL RESEARCH Vol.85 No.special

Effects of the bottom slope and guiding wall length on the performance of a vortex drop inlet

Rhee, Dong Sop,Park, Yong Sung,Park, Inhwan IWA Publishing 2018 Water Science & Technology Vol.78 No.6

<P>Laboratory experiments were conducted to assess the performance of a vortex drop inlet with a spiral intake in subcritical and supercritical flow conditions. The water surface elevation at multiple locations was measured for different flowrates by varying the extent of the guiding wall and the longitudinal and radial bottom slopes. The measurements show that a steeper longitudinal bottom slope decreases the water surface elevation at the beginning of the intake, resulting in a transcritical flow in the intake structure. However, a steeper longitudinal bottom slope also causes the maximum water surface elevation to occur within the spiral intake. For an effective vortex drop inlet design, achieving a low water surface elevation throughout the entire spiral intake structure is required. Experimental results show that the two seemingly conflicting design criteria, namely, achieving a low water surface elevation in the approach channel and reducing the maximum water surface elevation in the intake structure, can be simultaneously achieved by adding a radial bottom slope.</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.

준3차원 동수역학 모형의 입력변수가 충격파 전파에 미치는 영향

이동섭 ( Dong Sop Rhee ),김형준 ( Hyung-jun Kim ),송창근 ( Chang Geun Song ) 한국안전학회 2017 한국안전학회지 Vol.32 No.2

Present study investigated the influence of time step size, turbulent eddy viscosity, and the number of layer on rapid and unsteady propagation of dam break flow. When the time step size had a value such that it resulted in Cr of 0.89, a significant numerical oscillation was observed in the vicinity of the wave front. Higher turbulent viscosity ensured smooth and mild slope of velocity and water stage compared with the flow behavior by no viscosity. The vertical velocity at the lower layer positioned near the bottom showed lower velocity compared with other layers.