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교량시설물 안전관리 네트워크 구축을 위한 기존 시스템 연계방안 연구
박기태,이우상,주봉철,황윤국,Park. Ki-Tae,Lee. Woo-Sang,Joo. Bong-Chul,Hwang. Yoon-Koog 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
In general, structures in service gradually lose original performance according to time due to initial defects in design and construction, or exposure to unfavorable external conditions such as repeated loading or deteriorating environment, and in extreme cases, may collapse in large disaster. Therefore, in order to maintain the serviceability of structures at optimal level, advanced structure measuring system which can inform optimal time point and method of maintenance is required in addition to accurate prediction of residual life the structure by periodic inspection. To guarantee the safety level of bridge structure and to prevent from disaster, the integration of safety network for bridge structures are needed. Therefore in this study, to enhance the effectiveness of safety network for bridge, the connection methodologies between safety network and pre-installed bridge monitoring system are investigated.
박기태,이우상,주봉철,황윤국,Park. Ki-Tae,Lee. Woo-Sang,Joo. Bong-Chul,Hwang. Yoon-Koog 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
The long term bridge monitoring system in Korea was installed in 1995 at first, and many bridges has been maintained by long term monitoring system. Recently, reliability of data and cost effectiveness has been increased by advanced sensor technology, measuring equipment. However, considering several reference and data on bridge monitoring systems in Korea, various problems of bridge monitoring systems can be found. Therefore, in this study, the state of the art on bridge monitoring systems in Korea were investigated and various problems and solutions for these problems were suggested.
AZO박막을 이용한 Terephthalate가 삽입된 Zn-Al 층상 이중 수산화물의 합성
박기태,윤순길,Park, Ki-Tae,Yoon, Soon-Gil 한국재료학회 2017 한국재료학회지 Vol.27 No.3
In this paper, synthesis of terephthalate intercalated Zn-Al: Layered double hydroxides (LDHs) was studied. We designed freestanding Zn-Al: carbonate LDH nanosheets for a facile exchange technique. The as-prepared Zn-Al carbonate LDHs were converted to terephthalate intercalated Zn-Al:LDHs by ion exchange method. Initially, Al-doped ZnO (AZO) thin films were deposited on p-Si (001) by facing target sputtering. For synthesis of free standing carbonate Zn-Al:LDH, we dipped the AZO thin film in naturally carbonated water for 3 hours. Further, Zn-Al: carbonate LDH nanosheets were immersed in terepthalic acid (TA) solution. The ion exchange phenomena in the terephthalate assisted Zn-Al:LDH were confirmed using FT-IR analysis. The crystal structure of terephthalate intercalated Zn-Al:LDH was investigated by XRD pattern analysis with different mole concentrations of TA solution and reaction times. The optimal conditions for intercalation of terephthalate from carbonated Zn-Al LDH were established using 0.3 M aqueous solution of TA for 24 hours.
서비스 수준 제약하의 공급망 분배계획을 위한 수요선택 방안에 관한 연구
박기태,김성식,권익현,Park, Gi-Tae,Kim, Sung-Shick,Kwon, Ick-Hyun 한국시뮬레이션학회 2006 한국시뮬레이션학회 논문지 Vol.15 No.3
대부분의 공급망 계획에서 사용되는 각 계획 기간 내의 예측수요는 확정적인 것으로 간주한다. 그러나 현실에서 주어진 계획 기간 내의 수요 예측값은 확률적으로 분포를 따르는 것이 일반적이다. 본 연구는 기존의 안전재고를 통한 서비스 수준을 관리하는 방법을 대신하여 고객 수요의 분포내의 특정한 값을 수요 예측값으로 사용하는 수요선택 방법에 대해 다룬다. 수요 분위수와 계층 재고의 개념을 활용하여 서비스 수준 제약이 존재하는 시리얼 재고시스템을 대상으로 비교적 간단하지만 효과적인 수요선택을 위한 휴리스틱 알고리듬을 제안한다. 시뮬레이션을 활용한 비교 실험을 통해 제안된 알고리듬이 최적해와 유사한 매우 정확한 결과를 보임을 입증하였다. In most of supply chain planning practices, the estimated demands, which are forecasted for each individual period in a forecasting window, are regarded as deterministic. But, in reality, the forecasted demands for the periods of a given horizon are stochastically distributed. Instead of using a safety stock, this study considers a direct control of service level by choosing the demand used in planning from the distributed forecasted demand values for the corresponding period. Using the demand quantile and echelon stock concept, we propose a simple but efficient heuristic algorithm for multi-echelon serial systems under service level constraints. Through a comprehensive simulation study, the proposed algorithm was shown to be very accurate compared with the optimal solutions.
도약적 국가 우주력 발전을 선도할 제2 우주센터 구축 필요성 연구
박기태,Park, Ki-tae 한국우주과학회 2022 우주기술과 응용 Vol.2 No.2
Witnessing current military conflicts in South China Sea and Eastern Europe, most defense analysts evaluate one of the most serious security threat toward the US is coming from the superpower competitions with Russia and China. The main means for such super power hegemonic competitions is military power and space power is a key enabler to maximize the efficiency and effectiveness of military employment. Reflecting above circumstances, the space hegemonic competition between the Unites States and China is spreading into all aspects of national powers. Under such an environment, R.O.K needs to significantly develop national space power to preserve life and assets of people in space. On the other hand, the R.O.K has a lot of limitations in launching space assets into orbits by land-based space rockets due to its geographic locations. The limitation of rocket launching direction, the failure to secure a significant area enough to secure safety and the limitation to secure open area enough to build associated facilities are among them. On this paper, I will suggest the need to build the 2nd space rocket launching site after analyzing a lot of short-falls the current 'Naro' space center face, compared to those of advanced space powers around the world.
IP망과 MPLS망에서의 Video Streaming Service 성능 개선
박기태,김중민,복혁규,Park, Ki-Tae,Kim, Joong-Min,Bok, Hyeok-Kyu 한국정보과학회 2005 정보과학회논문지 : 기술교육 Vol.2 No.1
인터넷 트래픽이 증가하여 인터넷 서비스의 품질을 현저히 떨어뜨려 QoS를 보장받아야 하는 비디오 스트리밍 서비스에도 심각한 영향을 끼치게 되었다. MPLS 망에서 트래픽 엔지니어링은 망의 능력에 맞게 사용자의 QoS 요청을 트래픽 특성별로 구분된 클래스에 따라 망 자원을 할당하거나 제어한다. MPLS 망에서 다른 트래픽에 영향을 받지 않으면서 지연시간을 줄이고 전송률을 높이기 위해 인입 LSR에서 CQ_LLQ 방식을 적용하여 사용자 할당을 다르게 하는 정책을 통해 QoS를 만족시킬 수 있음을 보인다. As internet traffic is growing, quality of internet service is more worse and video streaming services that must guarantee QoS (Quality of Service) come under the influence. Traffic engineering in MPLS network classify QoS request of users according to traffic characteristics, assigns and controls network resources. Ingress LSR(Label Switching Router) in MPLS network applied CQ_LLQ(Custom Queuing with Low latency Queuing)method to be not effected by different traffics, to decrease delay time and to enhance transfer rate. Experiments show that quality of service is satisfied through the policy that differs the allocation of user request.