• The Magazine of the IEIE
• /
• v.29 no.3
• /
• pp.36-40
• /
• 2002

• International Journal of Automotive Technology
• /
• v.6 no.3
• /
• pp.243-249
• /
• 2005

To improve the ride comfort and handling characteristics of a vehicle, an active suspension which is controlled by external actuators can be used. An active suspension can control the vertical acceleration of a vehicle and the tire deflection to achieve the desired suspension goal. For this purpose, Model Predictive Control (MPC) scheme is applied with the assumption that the preview information of the oncoming road disturbance is available. The predictive control approach uses the output prediction to forecast the output over a time horizon and determines the future control over the horizon by minimizing the performance index. The developed method is applied to a half car model of four degrees-of-freedom and numerical simulations show that the MPC controller improves noticeably the ride qualities and handling performance of a vehicle.

• Proceedings of the Korea Association of Information Systems Conference
• /
• 2004.11a
• /
• pp.401-408
• /
• 2004

본 연구는 환적화물을 처리하는 모선사, 피더선사, 하주 등의 항만물류주체의 업무처리 생산성과 효율성을 제고하기 위한 정보시스템, Transhipment Container Handling System (TCHS)을 제시하였다. 국내의 환적화물에 대한 업무처리는 일반적으로 선사와 피더선사간의 환적화물계약업무 모선사의 환적화물을 피더선사에게 할당하는 업무, 마지막으로 미처 할당되지 못한 모선사의 환적화물과 피더선박의 잔여 선복을 거래하는 업무와 같이 3부분으로 구분된다. 그런데, 현재 이러한 업무를 처리함에 있어 개별적인 접촉과 적절한 정보시스템이 지원되지 않아서 많은 비용, 노력, 시간이 소비되고 있다. 그래서 본 연구에서는 환적업무에 관련된 항만물류주체의 요구조사를 통해 환적화물업무를 처리함에 있어 생산성과 효율성을 제고할 수 있는 정보시스템을 제안하였다. 본 연구에서 제안한 시스템은 현행 거래를 유지하면서, 각 업무의 효율적으로 지원하기 위한 시스템으로 온라인 계약지원시스템, 자동할당시스템, 협상기반 e-Marketplace 시스템으로 구성된다.

• Journal of Information Processing Systems
• /
• v.8 no.2
• /
• pp.279-300
• /
• 2012

Uncertainty and dynamism surrounding pervasive systems require new and sophisticated approaches to defining, detecting, and handling complex exceptions. This is because the possible erroneous conditions in pervasive systems are more complicated than conditions found in traditional applications. We devised a novel exception description and detection mechanism based on "situation"- a novel extension of context, which allows programmers to devise their own handling routines targeting sophisticated exceptions. This paper introduces the syntax of a language support that empowers the expressiveness of exceptions and their handlers, and suggests an implementation algorithm with a straw man analysis of overhead.

• The Transactions of the Korea Information Processing Society
• /
• v.6 no.3
• /
• pp.553-561
• /
• 1999

The facility of schema evolution is necessary in object-oriented database applications. There exist several versions of schema and instances created under different versions of the schema concurrently in the database. This base proposes a mechanism for supporting accessing instances regardless of versions of the schema in schema evolution environments in object oriented databases. There is trade-off between the flexibility of schema modification operations and the system overhead for supporting such schema modifications. Access handling routines are provided to the undefined attributes in each version of the class. Access handling routines are also defined for each pair of semantics rather than defining backdate/update functions for each pair of versions of a class. Thus, this mechanism supports the change of semantics with reduced user and system overhead.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.7 no.3
• /
• pp.117-128
• /
• 1997

When computer systems with mandatory access control mechanism are interconnected each other for enforcing the MHS(Message Handling System) security on the multilevel secure distributed network environment, illegal information flow may occurs due to the unexpected cascade vulnerability problem. In this paper, new MHS security policy and security property functions are proposed for preventing the cascade vulnerability.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.26 no.10
• /
• pp.1567-1570
• /
• 2022

This paper, we presents a RF protection technique of antenna switch by improving the power handling capability in worst case environment mode for mobile phone applications without critical payment of circuit performances such as insertion loss, isolation and ACBV (AC breakdown voltage). By applying a additional capacitive path located in front of the antenna in cell-phone, it performs the effective reduction of input power in high voltage standing wave ratio (VSWR) condition. Under the all-path off condition which causes a high VSWR, it achieved 37.7dBm power handling level as high as 5.7dB compared to that of conventional one at 2GHz. In addition, insertion loss and isolation performances were 0.31dB and 42.72dB at 2 GHz, respectively which were almost similar to that of the conventional circuit. The proposed antenna switch was fabricated in 130nm CMOS SOI technology.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.14 no.12
• /
• pp.2707-2715
• /
• 2010

This paper suggests a implements and a design of class diagram authorization tool based on the MVC pattern. It defines and descries the structure of ClassInformation, ScreenDisplay and ToolManager. ClassInformation is responsible for processing or handling information of a diagram. ScreenDisplay is responsible for GUI to configure the screen of the authorization tool. ToolManager is responsible for event handling to process I/O of the authorization tool. Based on MVC pattern, ClassInformation, ScreenDisplay and ToolManager of the authorization tool are assigned each role independently. It is flexible to new requirement, because of loose coupling.

• Journal of the Korea Society of Computer and Information
• /
• v.19 no.3
• /
• pp.155-161
• /
• 2014

The objective of this study is to weight analysis portable backpack system of infantry weapon systems for ergonomic design in manual materials handling tasks. For the product design, we analyzed the ergonomic guidelines and status of similar weapon systems by comparing the efficient operation performance provide for the basic data. Result of this study, the relationship between portability and mobility presented for schematic. In the short distance of the short biomechanical criterion, 1-2 hours in the middle of moving psychophysical criterion, 4 hour or more long-distance criterion applied for the physiological criterion for easy of trade-offs that need to be considered. This study suggests for 4 research items for infantry backpack system in manual materials handling tasks. Throughout the result of anthropometric populations, the 5%tile body weight for -0.91kg but 95%tile in 34.17kg considered to be margin for free, easy and efficient operation for the weight margin between portability and mobility in manual materials handling tasks.

• Journal of Korea Society of Industrial Information Systems
• /
• v.6 no.4
• /
• pp.12-21
• /
• 2001

Recently, as work strength is deepened, as well, labor environments is changed, simple and iterative worker's Cumulative Trauma Disorders(CTD) is gradually being increased. Accordingly, this study was designed to represent its system design to carry out their iterative and simple task by machine through the difference of muscle fatigue between worker on handling line and worker under the work environments by Air Balance System for the purpose of analyzing their muscle fatigue test according to fulfillment of iterative and simple task. From the result of this study, with regard to the comparison of muscle fatigue between work on handling line and work on automation line on the occasion of refractory brick loading, their muscle fatigue extent under the work environments by Air Balance system was lower than it of handling by AMEG(64.1%), MF(65.3%), MPF(64.3%), ZCR(63.6%) respectively. And also, generally there showed similar transfer at the aspect of muscle mobilization. In other words, we can say that work environments by Air Balance System is beneficial at the aspect of alleviating works' fatigue extent on handling line. As well, the result of this study shows that worker's exposure to Cumulative Trauma Disorders(CTD) is relatively low.