• 대한환경공학회지
• /
• 제22권7호
• /
• pp.1263-1271
• /
• 2000

Alum을 이용한 응집 과정에서 탁도 및 유기물 제거와 응집 floc의 특성을 파악하였다. 본 실험에서 구한 탁도 제거영역을 Amitharajah의 연구결과와 비교했을 때 sweep floc 및 charge neutralization의 제거영역이 낮은 pH 영역으로 이동하였는데 그 원인은 원수에 포함된 유기물 농도가 다른데서 찾을 수 있다. 대체적으로 탁도 및 유기물($UV_{254}$와 TOC)의 제거영역은 비슷하였으나 탁도 제거에 비해 낮은 pH에서 유기물 제거의 효과가 높았다. Floc의 특성은 AIA, SALLS 방법을 이용하여 volume diameter과 fractal dimension을 측정하였다. AIA 방법에 비해 SALLS 방법의 측정이 용이하고 신뢰성도 높았다. SALLS 방법을 이용하여 floc을 측정한 결과 sweep floc 영역의 floc이 charge neutralization 영역의 floc 보다 fractal dimension과 평균 직경이 크게 측정되었으며, 오염물질의 제거율이 높을수록 floc의 fractal dimension과 평균 직경도 크게 나타났다.

• 대한안전경영과학회지
• /
• 제6권3호
• /
• pp.211-235
• /
• 2004

Component based design is perceived as a key technology for developing advanced real-time systems in a both cost- and time effective manner. Already today, component based design is seen to increase software productivity, by reducing the amount of effort needed to update and maintain systems, by packaging solutions for re-use, and easing distribution. Nowdays, a thousand and one companies in If(Information Technology) industry such as Sl(System Integration) and software development companies, regardless of scale of their projects, has spent their time and endeavor on developing reusable business logic. The component software is the outcome of software developers effort on overcoming this problem; the component software is the way propositioned for quick and easy implementation of software. In addition, there has been lots of investment on researching and developing the software development methodology and leading If companies has released new standard technologies to help with component development. For instance, COM(Component Object Model) and DCOM(Distribute COM) technology of Microsoft and EJB(Enterprise Java Beans) technology of Sun Microsystems has turned up. Component-Based Development (CBD) has not redeemed its promises of reuse and flexibility. Reuse is inhibited due to problems such as component retrieval, architectural mismatch, and application specificness. Component-based systems are flexible in the sense that components can be replaced and fine-tuned, but only under the assumption that the software architecture remains stable during the system's lifetime. In this paper, It suggest that systems composed of components should be generated from functional and nonfunctional requirements rather than being composed out of existing or newly developed components. about implements and accomplishes the modeling for the Product Control component development by applying CCD(Contract-Collaboration Diagram), one of component development methodology, to MRP(Material Requirement Planning) System

• 한국지반공학회논문집
• /
• 제40권2호
• /
• pp.55-64
• /
• 2024

쉴드공법은 국제적인 사례에서 그 안정성을 입증한 반면, 경제적 효율성을 지닌 것으로 알려진 NATM 터널 굴착공법은 피복이 얕고 지반이 풍화되며 지하수가 많은 도심지에 적용 시 어려움을 겪고 있다. 본 논문에서는 도심지의 풍화된 암반층과 미고결 사질토 지반에서 발생할 수 있는 전형적인 두 가지 붕락 사례를 소개하고, 여섯 가지 안정성 평가 방법으로 두 붕락 사례를 분석하였으며, 그 결과를 종합하여 육각형의 다이어그램에 의한 방법으로 터널의 막장 안정성을 평가하였다. 본 연구의 분석 결과, 붕괴한 두 터널 현장의 결과와 평가 결과가 잘 일치하였으며, 대상터널의 지반 특성을 고려한 종합적인 평가 방법인 막장 안정성 평가 다이어그램에 의한 방법은 터널 설계 단계에서 터널의 막장 안정성을 확보하는 데 중요한 역할을 할 것으로 판단된다.

• International Journal of Computer Science & Network Security
• /
• 제24권6호
• /
• pp.207-215
• /
• 2024

Cloud computing is now used by most companies, business centres and academic institutions to embrace new computer technology. Cloud Service Providers (CSPs) are limited to certain services, missing some of the assets requested by their customers, it means that different clouds need to interconnect to share resources and interoperate between them. The clouds may be interconnected in different characteristics and systems, and the network may be vulnerable to volatility or interference. While information technology and cloud computing are also advancing to accommodate the growing worldwide application, criminals use cyberspace to perform cybercrimes. Cloud services deployment is becoming highly prone to threats and intrusions. The unauthorised access or destruction of records yields significant catastrophic losses to organisations or agencies. Human intervention and Physical devices are not enough for protection and monitoring of cloud services; therefore, there is a need for more efficient design for cyber defence that is adaptable, flexible, robust and able to detect dangerous cybercrime such as a Denial of Service (DOS) and Distributed Denial of Service (DDOS) in heterogeneous cloud computing platforms and make essential real-time decisions for forensic investigation. This paper aims to develop a framework for digital forensic for the detection of cybercrime in a joined heterogeneous cloud setup. We developed a Digital Forensics model in this paper that can function in heterogeneous joint clouds. We used Unified Modeling Language (UML) specifically activity diagram in designing the proposed framework, then for deployment, we used an architectural modelling system in developing a framework. We developed an activity diagram that can accommodate the variability and complexities of the clouds when handling inter-cloud resources.

• 건축역사연구
• /
• 제14권3호
• /
• pp.39-52
• /
• 2005

This study relates to the architectural planning principle of Gyeonghoeru pavilion, one of the major buildings in Gyeongbokgung palace. The study is concentrated on The Book of Gyeonghoeru Pavilion written by Jeong Haksun in 1865 during the reconstruction of Gyeonghoeru pavilion. The architectural planning principle of Gyeonghoeru pavilion disclosed in The Book of Gyeonghoeru Pavilion appears to be 'the method of expanding with six by six system'. 'The method of expanding with six by six system' means a way of continuously extending the number related to 6 by addition, subtraction, multiplication and division, and reflecting to architecture, having number 6 as the basic number. Number 6 means a large amount of water in East Asian philosophy, Applying 'the method of expanding with six by six system' to the architecture of Gyeonghoeru includes an intention to prevent fire in a way of a type of incantation because Korean traditional wooden buildings are we to fire. Since Gyeonghoeru is surrounded by a pond and was constructed based on the number 6 having a strength of water, it was believed that it could be safe from fire. This study compares the contents disclosed in The Book of Gyeonghoeru Pavilion with the construction of Gyeonghoeru to find out how the number 6 was applied to the overall construction of Gyeonghoeru. From the fact that the total number of km of Gyeonghoeru is 36 ($6{\times}6$), the number of pillars is 42 ($6{\times}7$), and the number of windows and doors is multiples of 6, it has been found out that the number 6 is deeply related to the overall construction of Gyeonghoeru. In addition to the fact that the construction of Gyeonghoeru can be explained by 'the method of expanding with six by six system', The Book of Gyeonghoeru Pavilion also discloses parts where Diagram of Hotu, Later Heaven Arrangement and Arrangement of 64 Hexagrams are applied. Therefrom, it has been found out that Gyeonghoeru pavilion was constructed by applying the principles of East Asian philosophy based on The Book of Changes.

• 건축역사연구
• /
• 제22권4호
• /
• pp.35-44
• /
• 2013

This paper looked into the structure of and changes in the building process of Gijang mountain fortress and its receiving reservoir by analyzing data from an excavation investigation. The structure of the receiving reservoir may be classified into a flat form, stone sheath, floor facility, wall facility, and entry and exit facility. The flat form of the Gijang mountain fortress and receiving reservoir is round. Concerning the sectional form, the wall was obliquely excavated in the trapezoid. As a stone sheath building method, it was built by undertaking a range work of oblong stone materials in a clockwise direction on a stamped soil floor. Then, it was treated with stamping using double layers of gray clay and yellowish brown clay on the floor and the wall. Also, in a space between the stamped layers on the floor, herbal plants and a straw mat were laid for waterproofing as well as to prevent sinking. As an entry and exit facility, two facilities were confirmed symmetrically in the southeast and in the northwest. It is believed that they were built additionally during rebuilding after the initial construction. The building process was revealed to have been carried out in 8 stages. Given the structure and excavated remains, the building period is estimated to be the early to mid 7th century for the initial building, the later 9th to 11th centuries for the primary rebuilding, and the later 16th to early 17th centuries for the secondary rebuilding.

• 한국건설관리학회논문집
• /
• 제22권6호
• /
• pp.64-75
• /
• 2021

전 세계적으로 급속한 도시화로 인하여 각종 사회문제와 부작용 등이 발생하고 있다. 이에 따라 시민의 삶의 질을 향상시키고 지속가능한 도시개발을 위하여 스마트시티 조성이 추진되고 있다. 국내에서도 각 부처별로 스마트시티 조성을 위한 비전 및 전략 등이 제시되어 왔으나, 부처별 입장에서 제시되는 한계점을 보이고 있으며, 국가적인 차원에서의 스마트시티 조성을 위한 비전과 핵심전략이 설정될 필요가 있다. 따라서 본 연구에서는 국내 스마트시티의 현황 분석과 문제점 분석을 통하여 스마트시티 조성을 위한 비전을 설정하였다. 또한 국내외 스마트시티 현황 분석 및 문헌고찰을 통하여 STEEP 분석을 실시하고, 이를 기반으로 인과지도를 작성하여, 스마트시티 비전 달성을 위한 주요전략들을 도출하였다. 본 연구에서 제안한 스마트시티 비전 및 주요전략들은 성공적인 스마트시티 조성을 위한 방향 설정에 기여할 수 있을 것이다.

• 한국환경과학회지
• /
• 제21권8호
• /
• pp.965-975
• /
• 2012

Loading of NPS pollutant was valued through simulation by using BASINS/HSPF model which can simulate runoff volume in rainfall by time. For the verification of the model, it was analyzed the scatter diagram of the simulation value and measure value of water quality and runoff volume in Dongcheon estuary. Using the built model, a study on the time-variant characteristics of runoff and water quality was simulated by being classified into four cases. The result showed the simulation value was nearly same as that of the measured runoff. In the result of fit level test for measured value and simulated value, correlation of runoff volume was computed high by average 0.86 and in the water quality items, fit level of simulation and measurements was high by BOD 0.82, T-N 0.85 and T-P 0.79.

• 산업공학
• /
• 제16권4호
• /
• pp.450-462
• /
• 2003

In this paper, we deal with a process and layout design for producing a planned amount of Sikhye in a given limited time period under a reasonable production schedule. We represent a Sikhye production line as a vector N, the element of which denotes the number of tanks required in each process and our objective is to find an appropriate vector which minimizes the total investment cost. We suggest a systematic method for finding an appropriate N and an appropriate layout to N. In detail, first, we decide the required sequence of processes and the required operations for each process and we estimate standard operating times. Second, constructing a precedence diagram, we find a critical path in order to reduce the total production lead time for a batch of Sikhye. Third, given a limited N space, we manage to construct manually each production schedule using both the processing times of the critical operations and transfer times. Finally, we find an optimal vector N which gives a minimum investment cost and meets both the time constraint and quantity constraint. In addition, with the estimated relative size of each tank, we suggest an appropriate conceptual layout design including an expansion area for future demands, based on the span technique used in the field of architectural design.

• 한국디지털건축인테리어학회논문집
• /
• 제12권4호
• /
• pp.29-37
• /
• 2012

The main aim of the current research is to make the resources for the architectural planning available and usable from the investigation of the various dwelling needs in order for the multicultural family to make comfortable settlement. The members of multicultural families demand the various needs depending on their usage and identification of the dwelling space. The current research has conducted to define the solution to address the raised issue and unsatisfied factors from the dwelling that does not meet the multi-cultural families' demand, finding out from the survey/interview from the multicultural dwellers The methods to investigate is firstly to conduct the research based on the previous data with theological study, secondly, to perform the survey to the members of the multi-cultural families, and thirdly, to determine the satisfactory status and the requesting factors for the spaces by in-depth interview with selected members of multi-cultural families, using the diagram.