• 한국군사과학기술학회지
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• 제10권2호
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• pp.148-151
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• 2007

The CF(Counter-fire) is neutralizing enemy's all command control systems and fire support elements. It will weaken a battle continuous ability and an intension to fight. At the beginning of the CF is obtaining locations of targets using various detection assets. CF command center processes acquired target information and send it to attacking equipments. The targets are classified into two classes, preplanned target and target of opportunity The target of opportunity is potential threaten, so it needs to take a immediate and exact process for determining location of target of opportunity. This paper proposes the real-time processing algorithm for offensive weapons to strike target of opportunity, and presents the result of its performance.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(III)
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• pp.73-78
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• 2003

The residual stresses and. distortions of structures by welding exert negative effect on the safety of railroad structures. This investigation performs a thermal elasto-plastic analysis using finite element techniques to evaluate residual stresses in butted-welded joint. Considering this initial residual stresses, local stress and strain at the critical location (weld toe) during the loading were analyzed by elastic plastic finite element analysis. Fatigue crack initiation life and fatigue crack propagation life of butt-welded specimen were predicted by local strain approach and Neuber's role and Paris law. It is demonstrated that fatigue life estimates by local strain approach closely approximate the experimental results.

• 대한골관절종양학회지
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• 제15권1호
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• pp.75-80
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• 2009

골수외 형질세포종은 아주 드물게 발생하는 종양으로, 전체 형질 세포 종양의 3~5 %를 차지하며 상부 호흡기관에서 주로 발생한다. 그 외 드물게 위장관, 방광, 중추 신경계, 유방, 갑상선, 고환, 타액선, 임파선, 피부 등에서 발생한 증례보고가 있다. 저자들은 49세 남자의 대둔근에서 발생한 골수외 형질세포종 1예를 경험하였기에 이를 문헌 고찰과 함께 보고하는 바이다.

• Computers and Concrete
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• 제11권4호
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• pp.351-364
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• 2013

This paper presents results from an analytical investigation of the behavior of steel reinforced concrete circular column sections with additional Glass Fiber Reinforced Polymers (GFRP) bars. The primary application of this composite section is to relocate the plastic hinge region from the column-footing joint where repair is difficult and expensive. Mainly, the study focuses on the development of the full nominal moment-axial load (M-P) interaction diagrams for hybrid concrete sections, reinforced with steel bars as primary reinforcement, and GFRP as auxiliary control bars. A large parametric study of circular steel reinforced concrete members were undertaken using a purpose-built MATLAB(c) code. The parameters considered were amount, location, dimensions and mechanical properties of steel, GFRP and concrete. The results indicate that the plastic hinge was indeed shifted to a less critical and congested region, thus facilitating cost-effective repair. Moreover, the reinforced concrete steel-GFRP section exhibited high strength and good ductility.

• 한국구조물진단유지관리공학회 논문집
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• 제3권2호
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• pp.205-212
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• 1999

Recently, unexpected cracks in the concrete deck slab of composite steel bridges have been widely reported at an early age of concrete placing due to the concrete placing sequence and methods. Accordingly, the analytical research was carried out to verify the negative moment at an internal supports due to the several concrete pouring sequence and to determine the reasonable concrete placing method on the deck slab of composite steel bridge. The results show that the conventional concrete-placing method, which pours concrete first on the positive moment regions and then negative regions, leads to the minimum moment at an internal supports. However, the conventional method produces two impractical construction joints on every spans and makes field engineer to pour concrete continuously. In conclusion, this concrete-placing method was verified to be reasonable only when the construction joint was placed at the $\frac{5}{8}l{\sim}\frac{6}{8}l$ location of the middle span.

• Geomechanics and Engineering
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• 제21권3호
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• pp.259-268
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• 2020

The synthetic rock mass (SRM) were used to investigate the influence of specimen size on the mechanical properties of jointed rock mass. The SRM were established based on parallel bond model (PBM) and smooth joint model (SJM) and the scaled rock specimens were sampled in two SRMs considering three sampling locations. The research results show that the smaller the initial fracture density is, the greater the uniaxial compressive strength (UCS), elastic modulus (E) is when compared with the same sampling location. The mechanical properties of rock specimens obtained by different sampling methods in different SRMs have different scale effects. The strength of rock specimens with more new cracks is not necessarily less than that of rock specimens with fewer new cracks and the failure of rock is caused by the formation of macro-fracture surface.

• 대한족부족관절학회지
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• 제23권2호
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• pp.43-51
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• 2019

Despite the increasing number of osteochondral lesions of the talus, there are a lack of definite evidence-based treatment protocols. Several types of treatments are available, each having their advantages and disadvantages. First-line therapy consists of well-conducted conservative treatment. Surgical treatment is the second choice. Treatments are chosen based on the size of the lesion, location, chronicity, and the condition of the neighboring cartilage. This article reviews the current updates in the treatment of osteochondral lesions of the talus to help clinicians use the available treatment strategies more efficiently.

• 전자통신동향분석
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• 제37권5호
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• pp.1-10
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• 2022

Digital trade rules are crucial in supporting the digital economy as the rules effectively reduce unnecessary trade barriers. This study introduces various approaches that major countries take regarding digital trade policies and rules. Comprehensive and Progressive Agreement for Trans-Pacific Partnership has introduced comprehensive rules on e-commerce, including binding articles on the free flow of information, location of computing facilities, and source code. More recent e-commerce provisions or digital trade agreements cover wider range of issues, from cyber security, artificial intelligence, and data innovation to electronic invoicing and payments. Multilateral negotiations on digital trade rules, including the World Trade Organization E-commerce Joint Statement Initiatives and Indo-Pacific Economic Framework, are in progress. Thus, countries involved are expected to respond to new digital trade issues with long-term strategies considering domestic policy objectives.

• 로봇학회논문지
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• 제16권3호
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• pp.283-290
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• 2021

We propose a task and motion planning algorithm for clearing obstacles and wiping surfaces, which is essential for surface disinfection during the pathogen disinfection process. The proposed task and motion planning algorithm determines task parameters such as grasping pose and placement location during the planning process without using pre-specified or discretized values. Furthermore, to quickly inspect many unit motions, we propose a motion feasibility prediction algorithm consisting of collision checking and an SVM model for inverse mechanics and self-collision prediction. Planning time analysis shows that the feasibility prediction algorithm can significantly increase the planning speed and success rates in situations with multiple obstacles. Finally, we implemented a hierarchical control scheme to enable wiping motion while following a planner-generated joint trajectory. We verified our planning and control framework by conducted an obstacle-clearing and surface wiping experiment in a simulated disinfection environment.

• 대한골관절종양학회지
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• 제11권2호
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• pp.160-167
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• 2005

목적: 거대세포종은 대부분 대퇴골 원위부 및 경골 근위부에 주로 발생하며, 병소 내 소파술에서 광범위 절제술까지 다양한 수술 방법들이 시행되고있다. 저자들은 수술이 어렵고 재발율이 높은 슬관절 부위의 거대세포종 환자에서 재발율을 포함한 치료 성적을 분석하고, 재발율과 관련된 인자를 규명하고자 하였다. 대상 및 방법: 병리학적으로 확진 되고, 고속 바(high-speed burring)와 골 시멘트를 이용한 병소내 소파술을 시행 한 41예의 슬관절 주위 거대세포종 환자를 대상으로 하였다. 재발율과 기능적 평가를 통한 치료 성적을 분석하였으며, 성별, 연령, 종양의 위치, 크기, 연골 하골의 침범과 관절 내 침범 유무 그리고 Campanacci 분류에 따른 인자들과 재발율과의 상관관계를 통계적으로 분석하였다. 평균 추시 기간은 50(12~122) 개월이었다. 결과: 최종 추시 상 재발율은 17%였고, 재발시기는 평균 술 후 10개월이었다. Musculoskeletal Tumor Society (MSTS) Grading System에 의한 술 후의 기능 평가점수는 평균 27.8(93%)로 78%에서 만족스러운 기능을 보였다. 성별, 연령, 종양의 위치, 크기, 연골 하침범, 관절 내 침범, Campanacci 분류 등은 종양의 국소 재발과 통계적으로 유의한 상관 관계를 보이지 않았다. 결론: 슬관절 주변 거대세포종의 재발과 관련된 인자를 찾지는 못하였다. 수술적 치료로서 고속 바를 이용한 세심한 소파술과 골시멘트 충진술을 이용한 국소 절제술 만으로도 만족할 만한 결과 및 재발율을 얻을 수 있었다.