• 한국조경학회지
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• 제42권2호
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• pp.91-102
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• 2014

최근 도시정책에서 도시공원이 차지하는 비중은 확대되고 있다. 좋은 도시공원체계 확보를 위해서 공원정책 및 계획에 대한 중요성이 커지고 있다. 이러한 상황에서 세계 주요도시의 공원녹지 관련 계획의 운영체계와 계획내용을 비교하는 것은 의미가 있다. 본 연구는 도시적 차원에서의 공원녹지기본계획의 운영체계 및 계획내용에 관한 비교연구이다. 연구대상지로는 영국 런던, 미국 뉴욕, 독일 베를린, 호주 시드니, 국내 서울을 선정하였고, 분석자료는 각 도시별 공원녹지 관련 기본계획 및 전략보고서를 중점적으로 분석하였다. 분석의 틀은 운영체계와 계획내용으로 구분하여 설정하였고 결과는 다음과 같다. 첫째, 공원녹지계획을 관련자원과 연계된 오픈 스페이스 계획으로 수립함으로써 자원의 통합적 관리 및 형평성에 대한 실천에 이바지하고자 한다. 둘째, 공원녹지계획이 초기의 양적 공급에서 질적가치의 향상으로 더 나아가 재활성화 및 재생에 이바지하는 방향으로 전환하고 있다. 셋째, '공급중심의 계획'에서 '수요에 기반한 평가' 모델로 전환함으로써 인구학적 변화, 트렌드 변화, 선호도 변화에 유연하게 대응하는 계획 모델로 수립되고 있다. 넷째, 계획의 주체, 수립단계별 참여 기회 확대, 참여구성원의 다양화를 통해 수동적 참여에서 적극적 참여계획으로 전환되고 있다. 공원녹지기본계획의 실천성을 제고하기 위해서는 공원녹지에 관한 새로운 인식변화를 적극 수용하고, 공원 거버넌스를 수용을 도입하며 상황에 기민하게 대응하는 유연한 계획접근이 필요하다.

• 산업경영시스템학회지
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• 제40권2호
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• pp.111-120
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• 2017

This paper proposes an improved standard genetic algorithm (GA) of making a near optimal schedule for integrated process planning and scheduling problem (IPPS) considering tool flexibility and tool related constraints. Process planning involves the selection of operations and the allocation of resources. Scheduling, meanwhile, determines the sequence order in which operations are executed on each machine. Due to the high degree of complexity, traditionally, a sequential approach has been preferred, which determines process planning firstly and then performs scheduling independently based on the results. The two sub-problems, however, are complicatedly interrelated to each other, so the IPPS tend to solve the two problems simultaneously. Although many studies for IPPS have been conducted in the past, tool flexibility and capacity constraints are rarely considered. Various meta-heuristics, especially GA, have been applied for IPPS, but the performance is yet satisfactory. To improve solution quality against computation time in GA, we adopted three methods. First, we used a random circular queue during generation of an initial population. It can provide sufficient diversity of individuals at the beginning of GA. Second, we adopted an inferior selection to choose the parents for the crossover and mutation operations. It helps to maintain exploitation capability throughout the evolution process. Third, we employed a modification of the hybrid scheduling algorithm to decode the chromosome of the individual into a schedule, which can generate an active and non-delay schedule. The experimental results show that our proposed algorithm is superior to the current best evolutionary algorithms at most benchmark problems.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.928-934
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• 2009

Although the evolution and deployment of information technologies will undoubtedly play an important role in the current construction industry, many engineers are still unsure of the economic value of using these technologies. Especially for the planning of a construction project, a collaboration system to utilize the whole resources is a essential tool for the successful outcome. A detailed, authoritative, and readily accessible information model is needed to enable engineers to make cost-effective decisions among established and innovative plan alternatives. Most engineers rely on limited private experiences when they create solutions or design alternatives. Initial planning is crucial for the success of the construction project. Most construction projects are done through collaboration of engineers who have different specialized knowledge. Information technologies can dramatically enhance the performance of the collaboration. For the information delivery, we need a mediator between engineers. Object-based 3-D models are useful for the communication and decision assistance for the intelligent project design. In this paper, basic guidelines for the 3-D design according to different construction processes are suggested. Adequate interoperability of 3-D objects from any CAD system is essential for the collaboration. Basic architectures of geometry models and their information layer were established to enable interoperability for design checks, estimation and simulation. A typical international project for roadway was chosen for the pilot project. 3-D GIS model was created and bridge information models were created considering several requirements for planning and decision making of the project. From the pilot test, the integrated construction project planning using 3-D information models was discussed and several guidelines were suggested.

• 한국산업정보학회논문지
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• 제15권4호
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• pp.7-15
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• 2010

본 연구는 SC-FDMA(Single Carrier-Frequency Division Multiple Access) 접속기술을 사용하는 LTE(Long Term Evolution) 상향링크의 성능을 최대화하기 위한 무선자원관리(radio resource management) 기법을 제안한다. 셀간의 상호작용을 고려해야하는 다중셀(multi-cell) 시스템을 대상으로 하여 단일셀 대상의 기존 SC-FDMA관련 연구와는 차별화된다. 본 연구는 무선자원관리를 무선자원 계획단계(planning phase)와 운용단계(operation phase)로 구분하여 정의한다. 계획단계는 마스터 eBN(evolved-NodeB)가 소속된 eNB에 연속적인 무선자원(RB; radio bearer)를 배정하기 위한 것이고 운용단계는 eNB가 마스터 eBN로부터 배정받은 RB를 단말기에 할당하기 위한 것이다. 두 단계에 대하여 각각 최적화 문제를 모형화하고 각 모형에 대한 탐색적 해법을 제시한다. 제시하는 해법은 인접해중에서 목적함수 개선치가 가장 높은 방향으로 이동하는 일반적인 형태를 띄고 있다. 다수의 실험결과를 통하여 두 알고리즘의 성능과 특징을 분석하였다. 본 연구는 다중셀 SC-FDMA 시스템을 대상으로 효율적인 무선자원 관리 기법을 개발하기 위한 연구에 선구자적인 역할을 할 것으로 기대된다.

• 한국지능시스템학회논문지
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• 제21권1호
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• pp.132-137
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• 2011

4족 보행로봇은 보행 안정성이 높아서 향후 다양한 분야에 활용이 기대되며, 효율적인 보행을 위한 걸음새의 생성과 제어가 중요하다. 특히, 다양한 로봇 모델들에 대한 수요와 여러 가지 걸음 동작의 필요성으로 인하여 자동적인 걸음새 생성기법이 요구된다. 본 논문에서는 HyperNEAT(Hypercube-based NeuroEvolution of Augmenting Topologies)를 사용하여 지형변화에 적응 가능한 4족 보행로봇의 걸음새를 생성하고, 바이올로이드로 구성된 4족 보행로봇에 대하여 ODE 기반의 Webots 시뮬레이션을 통해서 보행 실험을 수행하고 결과를 분석한다.

• Journal of Astronomy and Space Sciences
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• 제38권1호
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• pp.65-82
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• 2021

For the vast majority of geostationary satellites currently in orbit, station keeping activities including orbit determination and maneuver planning and execution are ground-directed and dependent on the availability of ground-based satellite control personnel and facilities. However, a requirement linked to satellite autonomy and survivability in cases of interrupted ground support is often one of the stipulated provisions on the satellite platform design. It is especially important for a geostationary military-purposed satellite to remain within its designated orbital window, in order to provide reliable uninterrupted telecommunications services, in the absence of ground-based resources due to warfare or other disasters. In this paper we investigate factors affecting the robustness of a geostationary satellite's orbit in terms of the maximum duration the satellite's station keeping window can be maintained without ground intervention. By comparing simulations of orbit evolution, given different initial conditions and operations strategies, a variation of parameters study has been performed and we have analyzed which factors the duration is most sensitive to. This also provides valuable insights into which factors may be worth controlling by a military or civilian geostationary satellite operator. Our simulations show that the most beneficial factor for maximizing the time a satellite will remain in the station keeping window is the operational practice of pre-emptively loading East-West station keeping maneuvers for automatic execution on board the satellite should ground control capability be lost. The second most beneficial factor is using short station keeping maneuver cycle durations.

• 한국정보전자통신기술학회논문지
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• 제9권5호
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• pp.478-495
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• 2016

기존의 도시계획은 내부 소수의 의사결정자들에 의해 이루어졌으나 스마트시티에서는 ICT 기술 진화를 통해 개인이 접할 수 있는 정보가 많아지고 채널이 다양화 되면서 다양한 방식으로 의사결정과정에 참여할 수 있게 되었다. 이에 본 연구에서는 스마트시티의 안전도시 계획 과정을 주민과 직간접으로 소통하는 협력적인 계획과정으로써 데이터 활용 방안을 제시하고자 한다. 이를 위해 WHO 국제안전도시 인증을 받은 일본의 마츠바라시(松原市)의 데이터의 내용과 활용을 국내와 비교하여 국제안전 도시의 승인을 준비하는 지역에서 주민참여 방안의 보조적 역할로 데이터의 활용성을 높이고자 한다.

• 건축역사연구
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• 제21권1호
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• pp.83-98
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• 2012

The starting point of this study is the concerning of simple behavioral pattern that whoever enters the inner space with taking off his shoes should go out from the position where he laid his shoes. The using of Ondol (floor heating room) and Maru (lifted wood floor) had changed the architectural space from chair-sitting to floor-sitting space, and it also made the behavior of taking off the shoes at the entrance of building and stepping on the lifted floor. This simple behavior has possibility to make lots of changes to the culture of architectural design. With this noticeable point, this paper is talking about the cultural feature of Korean traditional architecture, especially about the influence of tanking off and putting on shoes. The matter of shoes has changed diverse aspects of building and layout planning. It maximized the difference between front and rear part of building and characterized the lateral extension of Korean traditional house. The ritual space also had evolved from chair-sitting to floor-sitting space according to the type of ritual behavioral pattern. The change on the single building level had influenced on the layout planning of architectural complex. For examples, the parallel layout of ChangDeok-gung palace and the long sequential process to the main pavilion of Buddhist temple are the result of the matter of shoes. And NuGak(樓閣), the double-storied pavilion, on the axis of entering sequence's node is one of the unique planning elements that makes possible to go through the building without taking off the shoes and also makes upper level space for staying. In short, Korean traditional architecture that has the chair-sitting spatial origin of the East Asian cultural sphere has pursued new architectural issues and planning methods according to evolution to the floor-sitting culture.

• 한국주거학회논문집
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• 제19권6호
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• pp.9-20
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• 2008

The residential environment is a place which reflects the gradual evolution of human consciousness because it is a cultural space the term, 'houses' is not relevant in this context as it literally means 'contains'. The long history of human living habits cannot be 'contained' within a space, but can be 'expressed' by a space and by the way the space is used. Furthermore, due to the way it is typically constructed, the basic characteristics of the house usually cannot be rapidly changed to accommodate new habits. However, recent changes that have taken place to the characteristics of the traditional master room suggest that traditional societal values associated with patriarchy have diminished. The current trend where priority is given to children's education also affects such a change. Existing researches related to the master room is confined to the behavioral use of the space and the composition of the physical space, while research on the master room its plane type has not been carried out. Therefore, in this study, apartment model houses are selected, and are classified according to the types of master room. An analysis is then carried out of the master room based on the occupants' requirements in terms of consciousness. Any planning modifications where required are then suggested. This research comprises the followings stages. First, an examination is carried out of existing research on the master room in order to understand its background and spatial components. A definitiones of related terms is also provided. Second, an analysis is carried out of the model houses exhibited at Suwan District, examining the typical standard that has been selected for the master room. Third, an analysis is conducted of the topics and questions to be selected for a questionnaire. Fourth, an analysis is carried out of the consciousness, satisfaction and requirements of the residents, as respondents in the questionnaire, related to the master room. and Research is then conducted of the architectural methods for planning the master room. Finally, future countermeasures for planning the master room are described based on the above analysis and research findings.

• 디지털콘텐츠학회 논문지
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• 제16권1호
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• pp.43-51
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• 2015

국가재난안전통신망 구축사업 기술방식으로 공공안전 롱텀에볼루션(PS-LTE) 방식이 선정됐다. 이를 통해 2017년부터 경찰, 소방, 군 등 모든 재난안전 책임기관이 음성뿐 아니라 동영상 등 멀티미디어 정보를 활용해 구조활동을 벌일 수 있게 됐다. PS-LTE는 기존 LTE 기술에 그룹통화, 단말기 간 직접통신, 단독 기지국 기능 등이 추가된 방식이다. 지금까지 각 재난안전기관이 사용하던 통신기술은 음성만 전달할 수 있었다. PS-LTE 기술을 이용하면 멀티미디어 전송이 가능해진다. 본 논문에서는 해외 주요국에서 추진 중에 있는 광대역 공공안전통신정책 기술동향을 분석하고, 이를 통해 국내 광대역 공공안전통신 도입 시 고려해야 할 사항을 알아보았다.