• International Journal of Fuzzy Logic and Intelligent Systems
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• v.10 no.3
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• pp.203-209
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• 2010

This paper presents a hierarchical fuzzy motion planner for humanoid robots in 3D uneven environments. First, we define both motion primitives and locomotion primitives of humanoid robots. A high-level planner finds a global path from a global navigation map that is generated based on a combination of 2.5 dimensional maps of the workspace. We use a passage map, an obstacle map and a gradient map of obstacles to distinguish obstacles. A mid-level planner creates subgoals that help the robot efficiently cope with various obstacles using only a small set of locomotion primitives that are useful for stable navigation of the robot. We use a local obstacle map to find the subgoals along the global path. A low-level planner searches for an optimal sequence of locomotion primitives between subgoals by using fuzzy motion planning. We verify our approach on a virtual humanoid robot in a simulated environment. Simulation results show a reduction in planning time and the feasibility of the proposed method.

• Proceedings of the Korea Contents Association Conference
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• 2017.05a
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• pp.479-482
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• 2017

본 연구는 한국인이 일본이라는 국가에 갖는 국가 호감도에 미치는 영향을 분석한다. 한국인들이 갖는 일본에 대한 이미지에 일본문화접촉의 유형 및 빈도 등이 어떤 영향을 주는지를 밝힌다는 점에서 이전의 대중문화 그리고 국가호감도간의 연관성에 관한 연구들과의 차별된 결과를 도출한다. 또한, 접촉에 따른 일본에 대한 호감도의 양상과 더불어 이와 일본어 학습의 연관성, 일본문화에 대한 이미지의 연관성 등을 밝힌다.

• The Journal of Korea Robotics Society
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• v.3 no.1
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• pp.33-41
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• 2008

Based on object recognition technology, we present a new global localization method for robot navigation. For doing this, we model any indoor environment using the following visual cues with a stereo camera; view-based image features for object recognition and those 3D positions for object pose estimation. Also, we use the depth information at the horizontal centerline in image where optical axis passes through, which is similar to the data of the 2D laser range finder. Therefore, we can build a hybrid local node for a topological map that is composed of an indoor environment metric map and an object location map. Based on such modeling, we suggest a coarse-to-fine strategy for estimating the global localization of a mobile robot. The coarse pose is obtained by means of object recognition and SVD based least-squares fitting, and then its refined pose is estimated with a particle filtering algorithm. With real experiments, we show that the proposed method can be an effective vision- based global localization algorithm.

• Rapid Communication in Photoscience
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• v.3 no.1
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• pp.20-24
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• 2014

N-doped anatase $TiO_2$ nanoparticles were prepared by the sol-gel process followed by a hydrothermal treatment and successfully used as the photoanodes in organic dye-sensitized solar cells (DSSCs). As expected, the power conversion efficiency (PCE) of 8.44% was obtained for the NKX2677/HC-A-sensitized DSSC based on the 30 mol% N-doped $TiO_2$ photoanode, which was an improvement of 23% relative to that of the DSSC based on the NKX2677/DCA.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• v.18 no.4
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• pp.317-335
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• 2014

In this work, we investigate the global stability analysis of a viral infection model with antibody immune response. The incidence rate is given by a general function of the populations of the uninfected target cells, infected cells and free viruses. The model has been incorporated with two types of intracellular distributed time delays to describe the time required for viral contacting an uninfected cell and releasing new infectious viruses. We have established a set of conditions on the general incidence rate function and determined two threshold parameters $R_0$ (the basic infection reproduction number) and $R_1$ (the antibody immune response activation number) which are sufficient to determine the global dynamics of the model. The global asymptotic stability of the equilibria of the model has been proven by using Lyapunov theory and applying LaSalle's invariance principle.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2004.11a
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• pp.3-7
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• 2004

Many countries have changed her geodetic reference system from local system to global system because of the global network's necessity. And, also Korean geodetic reference system changed from Tokyo datum to Global geodetic reference system since 2003 as the revision of Survey Law and Korean reference ellipsoid changed from Bessel 1841 ellipsoid to GRS80. The purpose of this paper is evaluation of ellipsoid agreement before and after change due to the introduction of global geodetic reference system in Korea. For the evaluation ellipsoid agreement was analyzed using two Korean geoid model -KOGD2003 and KOBGDM33- on both ellipsoid and area variation caused by change of reference ellipsoid was calculated.

• The Korean Journal of Health Service Management
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• v.14 no.1
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• pp.55-65
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• 2020

Objectives: To provide guidance for agency planning by identifying barriers faced by Korean pharmaceutical companies in global regulatory affairs. Methods: A questionnaire survey on global regulatory affairs was administered by email to personnel at Korean pharmaceutical companies. From a total of 60, 28 responses were collected. Respondents' companies were classified as small-sized or large-sized, based on whether their annual sales amounted to KRW 100 billion. Results: Small-sized companies were experiencing greater difficulties in receiving drug approvals from advanced countries, particularly during the Investigational New Drug (IND) and Good Manufacturing Practice (GMP) processes. Conclusions: Support measures to specifically help small-sized companies enter more advanced markets and further improved global regulatory guidelines that can meet large-sized companies' expectations are needed. Moreover, domestic and global regulatory standards should be harmonized to benefit both groups.

• Journal of Information Display
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• v.8 no.1
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• pp.26-31
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• 2007

This paper presents ergonomic approaches to editing and evaluating content for 3D displays. Two systems, a nonlinear editing system and an evaluation system, were developed to improve viewing safety and comfort for 3D content observers and provide better usability for the creators from the viewpoint of ergonomics.

• Journal of the Optical Society of Korea
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• v.10 no.4
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• pp.162-168
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• 2006

The variation of global coherence on propagation plane by plane is examined in the framework of coherent mode representation. It is explained through concrete examples that the global coherence may in general be enhanced, may be reduced, or may not change. When the mode functions form a complete set and the corresponding eigenvalues are in nitely degenerate, there necessarily develops a certain amount of global coherence on propagation, which is the essence of van Cittert-Zernike theorem. The propagation generates a certain pattern of the eigenvalue spectrum from the initial flat one and this is shown to be related to the non-unitarity of the propagation kernel.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.35 no.4
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• pp.202-210
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• 2012

This study was analyzed based on the core competencies that Small Giant enterprises to foster the goals of growth of SMEs mid-sized businesses rather than Global Small Giant enterprises of the business model for a causal relationship. As the result, the average age, sales and number of employees of Korean small giants were 20.6 years, 148.8 billion won and 312.1. This research investigated that Korean small giants were realizing the sustainable growth with the firm shares in the target markets, based on added values in groups and technical powers, although their average age is one third younger than global small giants. The further research needs to develop and select small giants more precisely and strictly. It is expected that small giants will be new growth engines to improve global competitiveness of Korea.