• Proceedings of the Korean Geotechical Society Conference
• /
• 2006.03a
• /
• pp.257-267
• /
• 2006

The earth retaining wall systems for excavation works in a populated urban area or a poor soil deposit can be limited due to various restriction. Thus there are various methods to be applied for them such as the soldier pile method, the diaphragm wall with counterfort and so on. In this study, the self-supported earth retaining wall using the DCM(Deep Cement Mixing) method, including its merits, demerits and some important characteristics occured in the design and the construction stage, was introduced. It might be reference for the other design and construction procedures using the DCM method.

• 기술발표회
• /
• s.2006
• /
• pp.311-319
• /
• 2006

Artesian Pressure exists in Hwa Jeon Project Site of Nakdong Delta Area. Maxium value of the pressure ranges between 06 tonf/m2 and 1 3 tonf/m2 in the design site. This paper presents a design case study considering the Artesian Pressure to calculate the consolidation settlement of the deep marine clay.

• International Journal of Fuzzy Logic and Intelligent Systems
• /
• v.4 no.3
• /
• pp.341-346
• /
• 2004

Nowadays, versatile robots are developed around the world. Novel algorithms are needed for controlling such robots. A 2-Layer fuzzy controller can deal with many inputs as well as many outputs, and its overall structure is much simpler than that of a general fuzzy controller. The main problem encountered in fuzzy control is the design of the fuzzy controller. In this paper, the fuzzy controller is designed by the schema co-evolutionary algorithm. This algorithm can quickly and easily find a global solution. Therefore, the schema co-evolutionary algorithm is used to design a 2-layer fuzzy controller in this study. We apply it to a mobile robot and verify the efficacy of the 2-layer fuzzy controller and the schema co-evolutionary algorithm through the experiments.

• Proceedings of the KIEE Conference
• /
• 2003.07b
• /
• pp.804-806
• /
• 2003

In these days the Vacuum Circuit Breaker(VCB) is used in most medium voltage level because VCB has merits of simple structure, long life, free maintenance and environment friendly characteristics. Most of VCBs adopt mechanical spring drive mechanism to operate vacuum interrupter, but this mechanism is composed of many components and needs frequent maintenance works. In this paper, we study about the VCB drive mechanism with Permanent Magnet Actuator (PMA). Design methods and design flows about PMA are presented. The magnetic equivalent circuit is used for elementary and detailed design to determine the size of PMA. Finite Element Method (FEM) analysis is performed to evaluate the behavior characteristics of PMA in both static and transient state. Finally we manufacture sample PMA and verify FEM analysis through experiments.

• ETRI Journal
• /
• v.45 no.2
• /
• pp.203-212
• /
• 2023

In this study, we developed a co-located and space-shared multiple-input multiple-output (MIMO) antenna module with a modular design and high integration level. The proposed antenna pair includes a half-wavelength loop antenna and a dipole-type antenna printed on the front and back sides of a compact modular board. Owing to their modal orthogonality, these two independent antenna elements are highly self-isolated and free of additional decoupling components, even though they are assembled at the same location and within the same space. Thus, the proposed antenna is attractive in 5G MIMO systems. Furthermore, the proposed co-located and space-shared MIMO antenna module was employed in a 5G smartphone to verify their radiation and diversity performances. A 12 × 12 MIMO antenna system was simulated and fabricated using the proposed module. Based on the results, the proposed module can be employed in large-scale MIMO antenna systems for current and future terminal devices owing to its high integration, compactness, simple implementation, and inherent isolation.

• Proceedings of the KIEE Conference
• /
• 1988.11a
• /
• pp.224-228
• /
• 1988

Extensive development work which was carried out by Gold Star Cable Co., Ltd. has led to the optimal design, manufacture and test of fully engineered cable system for 345 kV self- contained oil filled (OF) underground cable. Details of design criteria and of tests are given. development of 345kV OF cable results in sucessful operations for ultra-high voltage power transmission requirement.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2004.11a
• /
• pp.107-107
• /
• 2004

• 한국HCI학회:학술대회논문집
• /
• 2006.02b
• /
• pp.240-245
• /
• 2006

시스템의 복잡도가 증가하고 컨버젼스 제품들이 늘어나면서 기존의 사용자 인터페이스 설계 방법론으로 미래의 사용자 환경을 예측하기엔 한계를 보인다. 또한, 제품 개발 시 관련 부서간 협업의 비중이 늘어난 반면 커뮤니케이션을 통해 얻을 수 있는 효과가 감소하고 있는 실정이다. 본 연구에서는 사용자 경험 설계 방법론으로써 PACT 분석을 응용한 시나리오 기반 디자인(Scenario-Based Design)을 채택하여 디지털 가전제품간의 네트워크 사용 환경에 대한 개념 디자인 방향을 효율적으로 제시하였다. PACT 분석은 People, Activity, Context, Technology 등 4 가지 요소를 시나리오 전개의 중요한 인자로 삼고 있는 방법론으로써 미래 사용 환경에 대한 예측과 체계적인 접근을 가능하게 했다. 또한, 다양한 전공자들로 구성된 관련 부서간의 커뮤니케이션 도구로 활용되어 각 분야의 전문성을 결과물에 반영하기에 효율적이었다. 추후 연구과제로는 본 방법론을 체계화하여 복잡하고 예측하기 어려운 도메인을 위한 사용자 중심의 설계 프로세스를 구성할 예정이다.

• Special Issue of the Society of Naval Architects of Korea
• /
• 2007.09a
• /
• pp.68-73
• /
• 2007

CPP is widely utilized in RoPax ship, shuttle tanker etc. due to excellent manoeuvrability in low speed, and its usage is recently increased. The CPP was almost designed by CPP maker, and its performance seemed to be not fully optimized. In this study the whole CPP design procedure was reviewed and design technology of CPP was settled down including calculation of spindle torque and MOI, which was fully confirmed by KHI CPP maker. In order to confirm the CPP design technique, a CPP for shuttle tanker was designed and its performance was verified through series of model tests. The propeller efficiency and face cavitation performance of the CPP was well improved. This CPP design technology will be contributed to the optimization of performance and cooperation with CPP maker.

• Special Issue of the Society of Naval Architects of Korea
• /
• 2008.09a
• /
• pp.33-37
• /
• 2008

The evidence of the Cargo tank volume is very important between Buyer and Seller for agreement each other for LNG Ship. CTS(Custody Transfer System) Radar type level gauging sensor to be measured for cargo volume. The data of Trim & List sensor to be compensated for measuring data which is original data of the CTS sensor. The latest days, the Buyer would have posed a problem both the location and the accuracy of trim/list sensor specially neared final stage of the ship's delivery. So, we would like to report the introducing to the trim/list sensor and the confirmation of actual location for the trim/list sensor.