• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
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• pp.132-133
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• 2015

Efficient scheduling and resource management are the key factor to reduce construction project budget (e.g., labor cost, equipment cost, material cost, etc.). Resource-based line of balance (LOB) technique has been used to complement the limitations of time-driven scheduling techniques (e.g., critical-path method). Optimizing construction alternatives contributes cost savings while honoring the project deadline. However, existing LOB scheduling is lack of identifying optimal resource combination. This study presents a method which identifies the optimal construction alternatives, hence achieving resource minimization in a repetitive construction by using genetic algorithm (GA). The method provides efficient planning tool that enhances the usability of the system.

• 전자공학회논문지B
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• 제33B권9호
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• pp.124-134
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• 1996

Korean has a large set of characters, and has a two-dimensional formation: each character is composed of graphemes in two dimensions. Whereas connections between characters are rare, connections inside a grapheme and between graphemes happen frequently and these connections generate many cursive strokes. To deal with the large character set and the cursive strokes, using the graphemes as a recognition unit is an efffective approach, because it naturally accommodates the structural characteristics of the characters. In this paper, we propose a grapheme-based on-line recognition method for cursive korean characters. Our method uses a TDNN recognition engine to segment cursive strokes into graphemes and a graph-algorithmic postprocessor based on korean grapheme composition rule and viterbi search algorithm to find the best recognition score path. We experimented the method on freely hand-written charactes and obtained a recognition rate of 94.5%.

• Journal of Power Electronics
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• 제12권6호
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• pp.925-934
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• 2012

Three-phase controlled converters have many applications in the utility interfacing of renewable energy sources and adjustable speed drives as a rectifier or inverter. The utility line currents of these converters have a high harmonic distortion, which is more than the harmonic standards. This paper introduces a new technique for circulating the third harmonic currents from the dc-link to the line currents to reduce their harmonic contents. The proposed system uses a single-phase PWM converter to control the angle and amplitude of the injection current for each of the firing angle of a three-phase converter. A detailed analysis is introduced to achieve a relationship between the firing angle of the three-phase controlled converter and the power angle of the PWM converter. In addition, a detailed design for the other injection path components is introduced. A simulation and experimental work is introduced to prove the mathematical derivations. Analysis, simulation and experimental results prove the superiority of the proposed technique.

• International Journal of Computer Science & Network Security
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• 제22권10호
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• pp.67-72
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• 2022

A wireless sensor network (WSN), with its constrained sensor node energy supply, needs an energy-efficient routing technique that maximises overall system performance. When rumours are routed using a random-walk routing algorithm, which is not highly scalable, spiral pathways may appear. Because humans think a straight line is the quickest route between two sites and two straight lines in a plane are likely to intersect, straight-line routing (SLR) constructs a straight path without the aid of geographic information. This protocol was developed for WSNs. As a result, sensor nodes in WSNs use less energy when using SLR. Using comprehensive simulation data, we show that our upgraded SLR systems outperform rumour routing in terms of performance and energy conservation.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.158-160
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• 2015

Efficient scheduling and resource management are the key factor to reduce construction project budget (e.g., labor cost, equipment cost, material cost, etc.). Resource-based line of balance (LOB) technique has been used to complement the limitations of existing time-driven scheduling techniques (e.g., critical-path method). Optimizing construction alternatives contributes to cost savings while honoring the project deadline. However, existing LOB scheduling is lack of identifying optimal resource combination. This study presents a method which identifies the optimal construction alternatives, hence achieving resource minimization in a repetitive construction by using genetic algorithm (GA). The method provides efficient planning tool that enhances the usability of the system.

• 한국ITS학회 논문지
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• 제15권3호
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• pp.60-67
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• 2016

환승누적함수에서 환승회수가 증가되면 환승비용에 대한 개별적인 환승의 영향이 선형 또는 비선형적으로 증가된다. 이 함수는 버스 또는 철도와 같이 대중교통노선에서 경로를 선택하는 승객의 행태를 효과적으로 설명한다. 이 함수로 통행시간이 더 소요되더라도 환승이 적은 대중교통노선을 선택하는 일반적인 상황의 구현이 가능하다. 그러나 환승누적함수가 포함되는 통행비용은 비가산성비용으로 최적경로탐색을 위해서 경로열거라는 어려운 상황을 포함한다. 본 연구는 환승누적함수를 고려하여 최적경로를 탐색하는 효과적인 방안을 제안하였다. 이를 위해 우선 환승누적함수가 포함되는 경우 경로탐색과정에서 나타나는 최적경로역전 현상을 설명하였다. 또한 복수의 경로를 탐색해서 최소의 비용경로를 최적경로로 선택하는 경험적인 방안을 제안하였다. 유입링크기반 전체경로삭제기법을 복수경로탐색기법으로 채택하여 알고리즘의 경로최적조건의 증명성에 기반하여 K개의 경로를 탐색하는 방안을 제안하였다. 환승계수를 도입하는 사례연구를 통하여 제안된 방안의 실제 교통망에 대한 활용성을 논의하였다.

• 디자인학연구
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• 제20권1호
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• pp.65-78
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• 2007

핸드폰과 무선 네트워크, 위치기반 기술 등 새롭게 등장한 기술들과 커뮤니케이션 미디어는 유비쿼터스라는 신조어를 낳으며 인간 삶의 모습들을 변화시켜 가고 있다. 이러한 기술과 커뮤니케이션 미디어의 영향은 예술계에서도 예외는 아니어서 이를 활용한 뉴 미디어 예술작품들이 늘어가고 있으며, 이는 미술관과 갤러리의 벽을 넘어 도시라는 광범위한 영역을 배경으로 공공 예술로서의 성격을 띄어가고 있다. 이 중에서도 위치 기반 미디어(locative media)를 이용한 위치기반 미디어 예술(locative media art)은 그 어떤 예술보다도 도시 공간과 밀접한 관계를 가지고, 도시 공간을 재해석, 경험하게 하고, 소통을 끌어내는 다양한 시도들을 보여주고 있다. 이러한 위치기반 미디어 예술의 성격은 도시 공간에서의 질적인 문제들, 특히 장소성 상실과 소통의 부재를 해결할 수 있는 하나의 방법으로 고려되기도 한다. 따라서 본 논문에서는 부산의 광복로를 프로젝트의 대상지로 설정, 위치기반의 드로잉과 스토리텔링을 이용한 프로젝트를 제안하여, 도시 공간에서의 질적인 문제들, 그 중에서도 상업적 장소에서의 장소성 회복과 소통의 가능성을 모색해 보고자 하였다. 프로젝트는 도시의 거리를 캔버스로, 사람들의 움직임을 붓으로, 거리의 색을 팔레트로 상정하여 참여자 각각이 자신만의 path를 그리고 그 path를 공유함으로써 사람들이 그와 관련한 이야기를 다른 사람과 나눌 수 있게 하며, 이러한 과정을 통해 만들어진 path는 온, 오프라인을 공유, 도시에 관한 보다 풍부한 이야기를 생성, 소통함을 기대할 수 있다.

• 로봇학회논문지
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• 제4권2호
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• pp.121-129
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• 2009

This paper presents a goal-directed reactive obstacle avoidance method based on lane method. The reactive collision avoidance is necessarily required for a robot to navigate autonomously in dynamic environments. Many methods are suggested to implement this concept and one of them is the lane method. The lane method divides the environment into lanes and then chooses the best lane to follow. The proposed method does not use the discrete lane but chooses a line closest to the original target line without collision when an obstacle is detected, thus it has a merit in the aspect of running time and it is more proper for narrow corridor environment. If an obstacle disturbs the movement of a robot by blocking a target path, a robot generates a temporary target line, which is parallel to an original target line and tangential to an obstacle circle, to avoid a collision with an obstacle and changes to and follows that line until an obstacle is removed. After an obstacle is clear, a robot returns to an original target line and proceeds to the goal point. Obstacleis recognized by laser range finder sensor and represented by a circle. Our method has been implemented and tested in a corridor environment and experimental results show that our method can work reliably.

• 대한족부족관절학회지
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• 제17권2호
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• pp.143-149
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• 2013

Purpose: Open reduction and internal fixation of calcaneal fracture using plate has been used. While numerous plates have been manufactured, most of the conventional plates are designed for westerners, realistically the size is larger for Korean. The domestic products, on the other hand, often have the undesirable screw holes and path. Therefore, we measured the radiologic parameter of Korean calcaneus for providing the plate and screw hole placements. Materials and Methods: We measured the outer lines and angles with over the 20 years old 291 females and 322 males. A: Length of inferior plane of calcaneus, B: Length of anterior plane of calcaneus, C: Length from line A to sinus tarsi, D: Length from line A to posterior point of posterior facet, E: Length from line A to calcaneal tuberosity, F: Length of posterior facet, G: Length from anterior point of line A to C, H: Length from line C to line D, a: Angle between A and B, b: Gissane angle, c: Bohler angle, d: Calcaneal pitch angle using Marosis m-view$^{(R)}$. Results: Mean A, B, C, D, E, F, G, H were 63.6, 26.4, 23.2, 43.7, 40.5, 26.9, 12.8, 18.1 mm. Mean a, b, c, d angle were 105.8, 122.4, 32.4, $20.5^{\circ}$. Male's calcaneus is significantly bigger than female's (p<0.001). Conclusion: AP calcaneus length 63.6 mm, maximal height 43.7 mm is considered to be helpful in making the Korean calcaneal plate.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.643-648
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• 2005

Generally, ships have marks of various shapes on outside of the hull. Among them, so called "Draft Mark" indicates the distance from the bottom of the keel to the waterline. Draft marks are used to determine the displacement and other properties of the ship for stability and control purposes. These marks are made up of welding bead or sticking the steel plate on outside of the hull. To improve the confidence level of the ship owner, quality and accuracy of the draft mark is very important. So the automatic mark welding robot is used to enable a high quality and accurate manufacturing line. To improve the system portability, the system is divided into two distinct parts, namely mechanical part and control part. Mechanical part is robust, a lightweight, and easy to dismantle. The control part consists of an in-house developed controller, which is based on embedded Linux. Also, the control part consists of power line communication module to ensure the applicability of the controller in manufacturing line. In this paper, the methodologies of control and configuration of the robot are discussed.