• Journal of Navigation and Port Research
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• v.35 no.6
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• pp.539-550
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• 2011

Hamburg is going with the HafenCity Project to create a new urban space for the city's bustling central district. HafenCity will add an additional 155 hectares to Hamburg's central urban area, increasing it's total area by some 40 percent. The qualities of the HafenCity are mainly marked through the location at the water, the river Elbe and the historically embossed milieu the Speicherstadt. A tightly mix of residential accommodation, offices, cultural and leisure amenities, retail facilities and restaurants manages diverse identities of quarters in a framework of an elaborate urban layout. This study is focusing on the purpose of the project goals, the task of the Hamburg authorities and GHS (Gesellschaft fur Hafen und Standortentwicklung) and an urban planning ideas competition (draft masterplan). Regarding of the new trend of the reurbanisation in Europe, the aim of this study is to find out, in which way HafenCity is trying to develope the new city district as a model for the European port city of the 21st century.

• Journal of Korean Society of Forest Science
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• v.104 no.2
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• pp.309-318
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• 2015

This paper aims to suggest the policies to solve the short supply of tree burial sites by NIMBY syndrome. For the purpose of this study, we conducted a site visit investigation and interviewed on the solved cases of NIMBY syndrome to tree burial sites and analyzed the factors to solve effectively the loss of residents induced from the burial facilities image of tree burial sites. As the result, in domestic cases, this study deduced the successful types which are providing an economical compensation, making the tree burial sites in cemeteries and making the sites in temple forests. In foreign cases, the types are deduced that made the tree burial sites as the place of attraction image not of cemeteries, and that induced the voluntary participation of residents by economic incentive. Based on such results, this study suggested the solution plans of NIMBY syndrome such as redevelopment of cemeteries, converting the image of tree burial sites into that of attraction places, and inducing PIMFY of residents by contest.

• Journal of the Economic Geographical Society of Korea
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• v.22 no.2
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• pp.141-159
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• 2019

Giving behavior promotes social solidarity and lessens social deprivations by voluntary practices to make better communities. Despite the increasing trend of giving in terms of participation and amount in Korean society, the giving culture has deeply rooted in charitable emotion based on compassion, still far from social solidarity. This paper attempts to identify giving behavior by investigating its characteristics and changes in its motives from the compassion-based social welfare to social responsibility and community solidarity, centering around 'Yellow envelope campaign' started in 2014 to support the living expenses and cost of litigation for the fired workers of Ssangyong Motors. By employing questionnaire survey and in-depth interview, it analyzes the horizontal relationships, reciprocal responsibility, social capital, and pursuit for conflict solution. Even though the campaign didn't change our society as a whole, but it cast the social questions on the birth of social empathy and solidarity.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05a
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• pp.881-886
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• 1998

한국형 표준 원진(울진 원전 3,4호기)화해 사건에 대한 2 단계 확률론적 안전성평가 (Level 2PSA) 에서 격납건물 파손모드에 큰 영향을 준다고 판단되는 현상들에 대한 불확실성 분석을 수행하였다. 불확실성 분석 대상은 주로 민감도분석 및 기존 2단계 PSA수행결과 중요한 인자로 선정된 8가지 주요 현상들로 국한하였다. 수행 방법은 성층화 추출방식 (Latin Hypercube Sampling)으로부터 발생된 1000개의 표본을 사용하였고, 분석결과는 두가지 불확실성 측도로 제시하였으며, 사용된 코드는 2 단계 PSA 분석용 전산코드인 CONPAS 이다. 불확실성 관리측면에서. 제일 불확실성이 높은 격납건물 파손모드인 원자로 공동바닥관통의 불확실성 인자를 줄이기 위해서는 CR-EJECT 현상에 대한 불확실성 을 줄여야 할 것이다.

• Fire Science and Engineering
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• v.30 no.2
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• pp.1-6
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• 2016

We are living in the 21st century, a new era of high-technology. Due to movements in population towards certain preferred areas, caused by material and technological advancement, growth has occurredn beyond the metropolis, leading to the development of the so-calleda "megalopolis." This development has changed the culture of housing, notably the characteristics of high-rise buildings, and underground facilities (such as subways and shopping centers), and has generally enlarged the scale of the facilities. Due to the increase in the number of single-family households, - notably ones including only the nuclear family, there has been a growing overpopulation problem, with apartments and urban housing developments expanding at rates beyond institutional safety regulations. In this study, we analyze the phenomenon of fire spreading in apartment buildings through actual apartment fire case studies, including that of the MunjonPonpuri apartment building. It was found that the speed at which the fire spreads is lower in apartments without than in those with an extended balcony. Based on the findings from case studies and the test results, we propose a series of safety countermeasures and responses for apartment fires.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.155-158
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• 2001

QoS(Quality of Service)측면에서 멀티미디어 응용 서비스를 제공하기 위해서 멀티미디어 통신은 여러 가지 요구사항을 지원하여야 한다. 연속적으로 생성된 미디어의 시간적인 관계를 유지하면서 재생시킬 수 있는 동기화 메커니즘은 무엇보다도 중요한 문제이다. 전달되는 매체를 공동으로 사용하기 때문에 트래픽의 폭주시, 지역적으로 멀리 떨어져 있는 경우에는 지연의 현상이 발생하게된다. 본 논문에서는 지연에 의해 발생되는 지연지터에 대하여 완충역할을 할 수 있는 최소 버퍼크기를 제시하였다. 주문형멀티미디어서버(MOS)의 경우 각 미디어 별로 서버에 저장하여 서비스하는 연구가 현재 활발히 진행되고 있으며 이것은 네트워크의 부하를 줄일 수 있다는 장점을 가지고 있다. 또한 이러한 데이터의 경우 클라이언트에서 어느 정도의 지터를 예상하여 버퍼의 크기를 갖고 있어야 하는 문제는 아직도 큰 문제점으로 나타나고 있다. 본 논문은 버퍼의 크기 및 재생에 관한 동기화 시점을 조정함으로서 버퍼의 오버플로우나 언더플로우의 현상을 방지하고자 한다. 제안한 기법은 기존의 기법보다 향상된 동기화 기법임을 시뮬레이션을 통해 검증하였다.

• The Journal of Engineering Geology
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• v.20 no.1
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• pp.1-12
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• 2010

The objective of this study was to examine the hydrogeochemical and microbiological characteristics for stable maintenance of coastal LPG storage cavern. Cavern seepage water and groundwater in the vicinity of the LPG storage cavern were sampled and analyzed (February, May, August and October 2007). Groundwater samples of propane cavern showed high pHs of 8.1~12.4 due to dissolution of cement grouting materials that had been applied during the well and cavern construction. The EC values showed distinctive seasonal variation. The negative ORP indicated reduced condition. The seepage and surrounding groundwater are classified as Na-Cl type, which represents seawater effects. All of aerobic bacteria, anaerobic bacteria, slime forming bacteria and sulfate reducing bacteria were less than 500 CFU/mL, which indicated that there was no abrupt increase of bacteria in the cavern. Therefore there exist no hydrochemical symptoms to indicate unstable conditions of the cavern operation. However, regular and continuous monitoring is essentially required.

• Journal of the Korean Society of Marine Environment & Safety
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• v.18 no.6
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• pp.610-616
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• 2012

All the countries in the world is currently facing the full scale of energy-climate era currently, and making strong energy policy that will lead to green growth of the future energy resources by utilizing renewable energy as the basis of entering the advanced country becomes the goal of development that satisfies the demand for energy in 21st century. Recently, ocean energy attracted the attention along with the necessity of developing renewable energy. Ocean energy is the one of most prominent recyclable and clean resources that has not been developed yet. So, it is highly required to develop good tidal current energy conversion system in coastal area. The inflow angle that acts against tidal current turbine, seabed effect and the change of efficiency along the occurrence of cavitation were investigated through the wake flow characteristics in this study. Power coefficient degradation by seabed effect did not appear in the condition of this calculation. Efficiency degradation appeared from above $10^{\circ}$ regarding inflow angle and power coefficient was calculated as lower by 7 % at $45^{\circ}$. Torque and power coefficient increased as inflow velocity rose, but power coefficient degradation appeared from above 3m/s when the cavitation happened. So, it was recognized that the larger inflow angle and occurrence of cavitation become the reason for power degradation through the flow characteristics.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.05c
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• pp.479-484
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• 2002

본 논문에서는 다중 사용자 간의 상호 작용과 공동 작업을 가능하게 하는 3차원 그래픽 기반의 가상 현실 시스템인 YVES(Yonsei Virtual Environment System) 의 성능향상을 위한 아바타 객체의 효과적인 동기화 방법에 대하여 제안하였다. YVES 는 연세대학교 컴퓨터과학과 멀티미디어 연구실에서 2001년도에 개발된 시스템이다. YVES의 사용자간 동기화 알고리즘은 기존의 방법에 비해 객체의 Poping현상을 없애고 동기화를 유지한 점에서 개선되었다고 할 수 있었다. 그러나 원래의 경로와는 변화된 다른 경로가 설정된다는 것과 이동이 완료되었을 때 수정된 경로로 향한 객체 진행 방향을 완료시점에서 원래의 진행방향으로 수정해야 항으로써 자연스럽지 못한 움직임을 보인다는 것이 문제점으로 지적되었다. 이를 보완하기 위해서 본 논문에서는 기존의 움직임 벡터를 새로 움직여야 할 움직임 벡터에 반영하여 새로운 경로가 원래의 경로와 보다 근접할 수 있도록 하고, 이동의 완료시점에서 객체가 향하는 방향이 원래 경로로 이동했을 경우와 동일하도록 하는 알고리즘을 제안하고, 각 알고리즘을 동일한 이동경로를 적용하여 비교하였다.

• The KSFM Journal of Fluid Machinery
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• v.16 no.1
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• pp.32-39
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• 2013

The multi-stage control valve is one of the devices which controls cavitation and high pressure drop. To attain the high pressure drop, the conventional control valves adopted the multi-stage trim to avoid the occurrence of local cavitation in valves. This work studied the effect of divergence angle on the characteristics of multi-stage trim. Pressure drop and flow characteristics was calculated for the 1 passage of multi-staged trim by using the FLUENT 6.3.26. The result showed that the pressure drop is significantly influenced by the divergence angle of multi-stage trim. In addition, the pressure drop increased consistently as the Reynolds number and divergence angle increases.