• 한국정보처리학회논문지
• /
• 제7권3호
• /
• pp.943-952
• /
• 2000

The surface reconstruction problem from a set of wire-frame contours is very important in diverse fields such as medical imaging or computer animation. In this paper, surface triangulation method is proposed for solving the problem. Generally, many optimal triangulation techniques suffer from the large computation time but heuristic approaches may produce very unnatural surface when contours are widely different in shape. To compensate the disadvantages of these approaches, we propose a new heuristic triangulation method which iteratively decomposes the surface generation problem from a band (a pair of vertices chain) into tow subproblems from two sub-bands. Generally, conventional greedy heuristic contour triangulation algorithm, suffer from the drastic error propagation during surface modeling when the adjacent contours are different in shape. Our divide-and-conquer algorithm, called band partitioning algorithm, processes eccentric parts of the contours first with more global information. Consequently, the resulting facet model becomes more stable and natural even though the shapes are widely different. An interesting property of our method is hat it supports multi-resolution capability in surface modeling time. According to experiments, it is proved to be very robust and efficient in many applications.

• 한국소음진동공학회논문집
• /
• 제20권10호
• /
• pp.931-939
• /
• 2010

A dash panel plays an important role to protect noise as well as heat. Meanwhile, it is also the most important path that transfers energy to the interior cavity, so that some of noises are transferred via air and its structural vibration becomes a major issue. From the viewpoint of NVH performance, simplified structures analogues to the dash wall are dealt with. Stiffeners, damping sheets and sound packages attached to a flat panel are taken into account as design variables. Structural radiation characteristics(thus, structure borne) such as radiation efficiency and radiation power are mainly discussed. For the case when an excitation is applied on a frame that surrounds the panel, it is shown that the radiation efficiency increases by attaching a stiffener to the panel, which is similarly found from the case when a panel is directly excited. It seems more effective to attach damping sheets along the boundary area of the panel rather than its middle area. The radiation efficiency of sound packages may make a dominant contribution to transmission loss as well as sound radiation. Experimental work was carried out to verify the results based on the simulation study.

• 대한수의학회지
• /
• 제60권4호
• /
• pp.187-194
• /
• 2020

Two small-breed dogs and two cats, with an average body weight of 4.88 kg (range: 4.3-5.5 kg), suffered hindlimb lameness due to luxation with or without fractures of the tarsocrural joint. These patients underwent tarsocrural arthrodesis with epoxy putty external skeletal fixator. The animals' skins were incised minimally, and the articular cartilage of the tarsocrural joint was removed, followed by autogenous cancellous bone grafting. Epoxy putty and positive Centerface®, pins with diameters 1.2 mm and 2.0 mm, were used for connecting bar and as a full pin fixation, respectively. All the patients regained the ability to bear weight on the affected limb within 3-7 days and resumed a normal gait within 9-15 weeks. The external skeletal fixator frame was removed within 13-17 weeks without major complications. Tarsocrural arthrodesis using epoxy putty external skeletal fixator resulted in excellent outcomes without severe postoperative complications in this study. Epoxy putty external skeletal fixator can be a valuable surgical option for tarsocrural arthrodesis in patients weighing less than 5.5 kg.

• 대한건축학회논문집:계획계
• /
• 제34권10호
• /
• pp.107-118
• /
• 2018

Cedric price is an architect and educator who have had an influence on architectural thinking through teaching and projects, rather than completed buildings. The purpose of this study was to analyze the architecture of Cedric Price in terms of time. Time was an important factor to understand his architecture along with his interest in technology, so most of his architectural thinking and methodology - anti-architecture, programmatic indeterminacy, a philosophy of enabling and so on, could be explained under the consideration of time. Depending on how he considered and used the concept of time, his projects could be categorized into two groups; The first group was related to the change over time, and this group again divided into three sub categories; change of user's preference, change of external environment, and change over building lifetime. The second group was related to planning of time, which could be divided again into two categories; programmatic planning and the usage planning during the period. This categorization could provide a frame to look into his architecture, through which his projects showed the limitation in modern architecture and the possibility for contemporary architecture.

• 대한건축학회논문집:구조계
• /
• 제35권10호
• /
• pp.171-180
• /
• 2019

In Korea, the seismic design of non-structural elements was interested by Earthquake of the 2016 Gyeong-ju and 2017 Po-hang. Among the non-structural elements, the ceiling system with steel panel used in Po-hang station showed failure examples of non-seismic design ceiling. In this study, the seismic performance of suspended ceiling with steel-panel, such as those used in Po-hang Station, was evaluated by shaking table tests. The shaking table tests were performed in accordance with the ICC-ES AC156 standard with floor acceleration being applied horizontally in one direction using a $3.3{\times}3.3m^2$ frame. The ceiling system consists of steel-panels, carrying channels, main and cross T-bars, and anti-falling clips. The anti-falling clip prevents the steel panel falling completely. The shaking table test confirmed that the damage at the previous stage had a direct impact on the damage state at the next stage. Through the shaking table test, the damage state of the T-bar type steel-panel suspended ceiling system was defined.

• Advances in concrete construction
• /
• 제11권1호
• /
• pp.1-9
• /
• 2021

This article discusses the issue of optimizing controller design issues, in which the artificial intelligence (AI) evolutionary bat (EB) optimization algorithm is combined with the fuzzy controller in the practical application of the building. The controller of the system design includes different sub-parts such as system initial condition parameters, EB optimal algorithm, fuzzy controller, stability analysis and sensor actuator. The advantage of the design is that for continuous systems with polytypic uncertainties, the integrated H2/H∞ robust output strategy with modified criterion is derived by asymptotically adjusting design parameters. Numerical verification of the time domain and the frequency domain shows that the novel system design provides precise prediction and control of the structural displacement response, which is necessary for the active control structure in the fuzzy model. Due to genetic algorithm (GA), we use a hierarchical conditions of the Hurwitz matrix test technique and the limits of average performance, Hierarchical Fitness Function Structure (HFFS). The dynamic fuzzy controller proposed in this paper is used to find the optimal control force required for active nonlinear control of building structures. This method has achieved successful results in closed system design from the example.

• Journal of Korea Trade
• /
• 제25권6호
• /
• pp.34-56
• /
• 2021

Purpose - This study presents strategies to overcome the COVID-19-induced crisis in Korea's meetings, incentives, conferences, and exhibitions (MICE) industry. It aims to quantitatively identify the environmental factors affecting the industry and their degree of influence, and derive optimal countermeasures. Design/methodology - The study applied the SWOT-AHP-TOWS framework. An AHP analysis was first performed within the SWOT frame, and then a TOWS analysis was conducted using the results of the SWOT-AHP analysis. In the AHP analysis, the number of pairwise comparison questions was limited to four for each SWOT factor to increase the consistency of responses by reducing the burden on respondents. Findings - The plunge in demand (threats factor) has had an overwhelming impact on the MICE industry, more than any other environmental factor. To overcome the crisis, the ST alternative that takes advantage of dynamic pop culture to minimize the business damage caused by the plunge in demand was the top priority measure. Based on the results, this study presents suggestions for overcoming the crisis in the MICE industry. First, the industry should develop profitable business models to supplement scarce financial resources by exploiting Korea's success with quarantine management. Second, the government must provide emergency relief funds or bailout support to protect MICE facilities and employees. Originality/value - Unlike previous work on the MICE industry, this study utilized the SWOT-AHPTOWS framework to derive quick research results in an abnormal situation. This approach can be expanded to other countries with different industrial environments and situations. Additionally, when applying this method to MICE sub-sectors, countermeasures should be tailored to each field.

• 한국정밀공학회지
• /
• 제14권11호
• /
• pp.69-76
• /
• 1997

The rotating bending fatigue tests were performed using the specimens taken from Cr-Mo-V steel, widely sued in thermal power plant turbines, at various temperatures such as room temperature, 300 .deg. C, 425 .deg. C and 550 .deg. C. The characteristics of fatigue crack propagation were examined and analyzed by using fracture mechanics parameter. The plastic replica method was also applied in order to measure the crack length on the basis of serial observation of fatigue crack propagation behavior on the defected specimen surface. The fatigue crack propagation behavior of Cr-Mo-V steel was investigated within the frame work of elastic-plastic fracture mechanics. The propagation law of fatigue crack is obtained uniquely by using the term .sigma. $^{n}$ sub a/where .sigma. $_{a}$ is the service stress, a is the crack length and n is a constant. The values of constant n are nearly equal to 2.48, 2.60 and 8.61 at room temperature, 300 .deg. C and 425 .deg. C.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2023년도 춘계학술발표대회
• /
• pp.8-10
• /
• 2023

삼킴장애는 음식물이 입에서 식도로 가지않고 걸리거나 기도(Trachea)로 흡입되는 문제를 갖는 상태이다. 특히 노인이나 신경계 질환을 앓는 환자의 경우 기도로 흡입된 음식덩이가 폐렴을 일으키고 결국에는 사망으로 이어지기에 적절한 치료와 관리가 요구된다. 보통 영상으로 판단할 수 있는 삼킴단계는 구강준비단계(Oral Preparatory Phase), 구강단계(Oral Phase), 인두단계(Pharyngeal Phase), 식도단계(Esophageal Phase) 4가지로 분류하고 삼킴장애는 침습(Penetration)과 흡인(Aspiration)으로 크게 2가지로 분류한다. 본 논문에서는 이러한 6가지 클래스를 가지는 삼킴장애 환자 비디오 파일을 라벨링하기 위한 웹 애플리케이션을 제안한다. 이를 구현하기 위해서 대용량 멀티프레임 이미지를 수신해서 분리하여 저장하도록 개발하였다. 또한 음식덩이를 정교하게 분할할 수 있도록 GrabCut 알고리즘을 적용하여 라벨링할 수 있도록 하였다. 차후 라벨러와 전문의 간의 협업이 가능하도록 라벨링 데이터의 상태를 관리할 수 있도록 개발하고자 한다.

• 과학교육연구지
• /
• 제37권1호
• /
• pp.170-185
• /
• 2013

본 연구의 목적은 생물 분류 탐구에서 과제 집착의 인지적인 모형을 규명하는 것이다. 이를 위해 생명 과학 탐구에서 과제 집착에 대한 다양한 문헌들을 분석하여 과제 집착에 대한 가설적인 인지적 모형을 고안하였다. 이 후, 고안한 모형의 규명을 위해 과제 집착의 분석을 위한 과제를 개발하고 사고 발성법과 회상적 면접법을 이용하여 연구 참여자의 프로토콜을 수집, 분석함으로써 생물 분류 탐구에서 과제 집착의 인지적 모형을 규명하였다. 연구 결과, 문헌 기반의 모형을 고안하고 프로토콜 분석을 통하여 규명한 과제 집착의 인지적 모형을 크게 과제 집착 유발, 과제 집착 강화, 과제 집착 유지의 세 단계의 과정으로 구성하였다. 과제 집착 유발 단계에서는 과제에 대한 관찰, 과제 관련 경험 표상, 탐구 예비 수행, 목표 평가의 하위과정으로 구성하였다. 과제 집착 강화 단계는 경험 기반 탐구 계획 설정 또는 경험 미기반 탐구 계획 설정, 적극적인 수행 및 소극적인 수행, 탐구 수행중 자기 평가, 가설 검증까지 반복적인 수행의 하위 과정으로 구성하였다. 과제 집착 유지 단계에서는 완료 후 피드백 수행, 자발적인 후속 탐구 수행의 하위 과정으로 구성하였다. 각 단계마다 과제 집착 구성 요소인 자신감, 목표설정, 주의집중이 변화하는 것으로 구성하였다. 위 연구 결과에 의해 생물 분류 탐구에서 과제 집착의 인지적 모형을 통해 생물 분류 탐구에서 과제 집착 향상을 위한 구체적인 교수-학습 전략을 구성하기 위한 기초 정보를 제공할 수 있으며 탐구과정에서 과제 집착의 단계적인 평가와 피드백 제시에 도움이 될 것이다.