• 한국의상디자인학회지
• /
• 제21권1호
• /
• pp.131-148
• /
• 2019

In this study, the purpose of the research is to present a cooperative convergence education Capstone design operational model that can promote community relations by spreading excellent practices through governmental, academic, and civil cooperation, ultimately contributing to the development of systematic plans among cooperative groups for successful promotion, and the production high effects in the fashion sector. The case study presented a new model that combines convergence in interdisciplinary studies, focusing on the case study of the "Fashion Capstone Design" textbook. The characteristics of the proposed model suggested three types of convergence- the convergence of government, academia and private cooperation, and the convergence of academic and civil organizations, depending on their role. The proposed educational model has the advantage of complementing and dealing with the difficulties presented by interdisciplinary education. It also has the effect of activating community linkages with colleges in the community. In addition, the effectiveness of community colleges and community links can be optimized. Through the example of this study, we look forward to being used as a references for a variety of cooperative convergence education capstone design projects.

• 한국정보통신학회논문지
• /
• 제18권5호
• /
• pp.1201-1206
• /
• 2014

소규모 상점은 상품 관리를 대부분 수기에 의존하고 있다. 이러한 수기 관리는 다양한 제품의 입출고 현황을 관리하는데 제한적이며 실시간 상품현황 관리는 별도의 통계 시스템을 이용해야 한다. 이러한 문제점을 해결하기 위해 개발된 기존의 POS 시스템은 고가의 비용 및 공간의 제약으로 중대형 및 특수매장 위주로 운용되고 있다. 이 때문에 소규모 상점의 수기에 의한 상품관리 대신 비용부담이 적지만 자동화된 새로운 상품관리 시스템이 필요하다. 본 논문에서는 NFC 기능을 탑재한 스마트폰을 활용하여 소규모 상점에서 판매되는 상품을 실시간으로 관리할 수 있는 시스템을 개발하였다.

• 한국인지과학회:학술대회논문집
• /
• 한국인지과학회 2005년도 춘계학술대회
• /
• pp.177-181
• /
• 2005

기계학습에서 커널을 이용한 방법은 그 응용범위가 기계학습의 전반에 걸쳐 다양하게 이용되고 있으며, 그 성능 또한 기존의 방법들을 앞지르고 있다. 이는 기존의 비선형적 접근을 커널을 이용한 고차원 공간에서의 선형적 접근법으로 바꿈으로써 가능하게 되는 것이다. 다양한 분야에 적용되는 많은 커널들이 존재하며 각 커널들은 특별한 분야에 적용되기 쉽도록 다른 형태를 띠고 있기도 하지만, 커널로서 작용하기 위해 양한정 조건(positive definiteness)을 만족해야 한다. 본 연구에서는 DNA 문제에 직접 적용시킬 수 있는 방법으로서의 새로운 커널을 제시한다. 또한 매트로폴리스(Metropolis) 알고리즘을 이용하여 DNA의 hybridization과정을 모사함으로써 새로운 종류의 커널이 양한정(positive definite) 조건을 만족시킬 수 있는 방법을 제시한다. 새로 만들어진 커널이 행렬값을 형성해 나가는 과정을 살펴보면 인간이 예(instance)로부터 개념을 형성해 나가는 과정과 흡사한 양상을 보이는 것을 알 수 있다. 개념을 나타내는 좋은 예로서의 표본(prototype)으로부터 개념이 형성되어 가는 과정은 표본(prototype)이 아닌 예로부터 개념이 형성되는 과정과 다른 양상을 띠는 것과 같은 모양을 보인다.

• Interdisciplinary Bio Central
• /
• 제2권2호
• /
• pp.4.1-4.6
• /
• 2010

The most common type of microarray experiment has a simple design using microarray data obtained from two different groups or conditions. A typical method to identify differentially expressed genes (DEGs) between two conditions is the conventional Student's t-test. The t-test is based on the simple estimation of the population variance for a gene using the sample variance of its expression levels. Although empirical Bayes approach improves on the t-statistic by not giving a high rank to genes only because they have a small sample variance, the basic assumption for this is same as the ordinary t-test which is the equality of variances across experimental groups. The t-test and empirical Bayes approach suffer from low statistical power because of the assumption of normal and unimodal distributions for the microarray data analysis. We propose a method to address these problems that is robust to outliers or skewed data, while maintaining the advantages of the classical t-test or modified t-statistics. The resulting data transformation to fit the normality assumption increases the statistical power for identifying DEGs using these statistics.

• 한국방송∙미디어공학회:학술대회논문집
• /
• 한국방송공학회 2015년도 하계학술대회
• /
• pp.308-309
• /
• 2015

최근 들어 일반인들도 다중 콥터와 4k 고성능 카메라를 장착한 상용 드론을 구매하여 자신의 취미 활동용으로 사용하고 있다. 드론을 이용한 많은 동호회가 생겨나고 1인 1드론, 개인용 드론의 시대가 시작되고 있다. 또한 사물인터넷의 시대에 걸맞게 아두이노, 라즈베리파이와 같은 오픈하드웨어 플랫폼과 오픈 소스를 이용하고 저가형 3D printer 의 보급으로 자신만의 독특한 형태를 지니는 기체 제작을 시작하고 있다. 이에 본 논문에서는 3D 캐드를 이용한 위상최적화 기법을 적용하여 기존 상용 기체의 강성은 그대로 유지하되 기체 프레임 무게를 절반으로 줄인다. 또한, 풍동실험을 진행해서 기존 기체에서 발생하는 유체흐름을 분석하고 새로운 기체를 적용했을 경우에도 유사한 유체흐름이 나타나도록 설계하여 3D 프린터를 사용하여 제작하였다.

• International Journal of Aeronautical and Space Sciences
• /
• 제14권4호
• /
• pp.356-368
• /
• 2013

The Korea Aerospace Research Institute plans to launch a lunar module by 2025, and so is carrying out a preliminary study. Landing stability on the lunar surface is a key design factor of a lunar module. In this paper, a 1/6 scale model of a lunar module is investigated, for its landing stability on non-level surfaces. The lunar module has four tripod legs, with aluminum honeycomb shock absorbers in each leg strut. ADAMS$^{TM}$, the most widely used multi-body dynamics and motion analysis software, is used to simulate the module's lunar landing. Three types of dampers in the struts (rigid, viscous, and aluminum honeycomb dampers), and two types of lunar surfaces (rigid and elastic) are considered. The Sforce function is adopted, to model the aluminum honeycomb dampers. Details on the modeling and analysis of the landing stability of the 1/6 scale lunar module and the simulation results are provided in this paper.

• 로봇학회논문지
• /
• 제19권1호
• /
• pp.58-64
• /
• 2024

The ability of the robot gripper to handle a wide range of objects significantly impacts its operational effectiveness. Among the robot grippers commonly used, the economically feasible choice is the relatively simple structure of a parallel gripper. To perform more densely packed tasks with a parallel gripper, it should be capable of handling small objects. Therefore, this study designs a parallel gripper mechanism equipped with assisting grippers to ensure smooth grasping of small objects. The parallel gripper is designed using a rack and pinion gear system, with two additional grippers on both side, and these assisting grippers are designed to be detachable. The two assisting grippers have different type of tip to grasp thin fabric shapes and thin stick shapes. The gripper prototype is used to verify the grasping capabilities for shapes achievable with a conventional parallel gripper and those intended for grasping with the assisting grippers through grasping experiments. Consequently, by equipping a conventional parallel gripper with assisting grippers as in this study, it becomes capable of handling a broader range of objects, in addition to its existing functionality.

• 한국환경복원기술학회지
• /
• 제27권2호
• /
• pp.55-65
• /
• 2024

This study aimed to figure out diel activity patterns of water deer and wild boar, whose habitat is disturbed by human activity in a suburban area. Photographic data of water deer and wild boar collected by 18 camera traps from January 2021 to November 2022 was categorized into four diel periods (dawn, day, dusk, and night), and converted into frequencies per 100 CTD (Camera Trap-Days) for seasonal and spatial diel activity pattern analysis. Water deer exhibited intense nocturnality in fall, and wild boar did in fall and winter. During the fall, water deer's night-time capture rate was the highest (61.9%), and day-time photographic rate was the lowest (13.9%) among other seasons. During the fall and winter, wild boar's night-time photographic rate was relatively high (77.6%, 78.0%, respectively), and day-time photographic rate was relatively low (0.7%, 1.8%) in comparison with other seasons. In spatial diel activity analysis, both water deer and wild boar showed a tendency to avoid humans, especially near trails during day-time hours. The day-time photographic rate of water deer in trail-near group was 12.1% and trail-far group was 24.6%. The day-time photographic rate of wild boar was 3.4%, 5.7%, respectively. Because the diel activity patterns of wildlife reflect human disturbance, this study provides useful ecological information for developing appropriate management plans for the coexistence of water deer and wild boar in suburban areas.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2011년도 제40회 동계학술대회 초록집
• /
• pp.449-449
• /
• 2011

We reported the direct effect of intrinsic surface energy of dry adhesive material to the Van der Waals and capillary forces contributions of the total adhesion force in an artificial gecko-inspired adhesion system. To mimic the gecko foot we fabricated tilted nanohairy structures using both lithography and ion beam treatment. The nanohairy structures were replicated from Si wafer mold using UV curable polymeric materials. The control of nanohairs slanting angles was based on the uniform linear argon ion irradiation to the nanohairy polymeric surface. The surface energy was studied utilizing subsequent conventional oxygen ion treatment on the nanohairy structures which resulted in gradient surface energy. Our shear adhesion test results were found in good agreement with the accepted Van der Waals and capillary forces theory in the gecko adhesion system. Surface energy would give a direct impact to the effective Hamaker constant in Van der Waals force and the filling angle (${\varphi}$) of water meniscus in capillary force contributions of gecko inspired adhesion system. With the increasing surface energy, the effective Hamaker constant also increased but the filling angle decreased, resulting in a competition between the two forces. Using a simple mathematical model, we compared our experimental results to show the quantitative contributions of Van der Waals and capillary forces in a single adhesion system on both hydrophobic and hydrophilic surfaces. We found that the Van der Waals force contributes about 82.75% and 89.97% to the total adhesion force on hydrophilic and hydrophobic test surfaces, respectively, while the remaining contribution was occupied by capillary force. We also showed that it is possible to design ultrahigh dry adhesive with adhesion strength of more than 10 times higher than apparent gecko adhesion force by controlling the surface energy and the slanting angle induced-contact line of dry adhesive the materials.

• 실천공학교육논문지
• /
• 제15권3호
• /
• pp.571-580
• /
• 2023

4차 산업혁명 시대가 도래함에 따라 대학 교육 영역에서도 융합학문에 대한 요구가 증가하고 있다. 따라서 본 연구는 기대이론을 적용하여 융합 관련 학과의 교육과정 개정의 주요 전략 중 하나인 모듈형 교육과정에 대한 학습자의 인식된 기대 요인을 탐색하였다. 2022년도 2학기 동안 학습자의 인식을 사전-사후로 측정하였고, 결과적으로 기대 요인 중 선택 요인은 수강 전과 비교하여 수강 후에 유의미한 수준으로 낮아진 것을 확인하였다. 과목 내 도구 활용에 대한 이해 및 어려움 수준에 대한 인식 변화가 위 결과에 영향을 미쳤을 가능성이 있다. 본 연구의 결과는 모듈형 교육과정에 대한 학습자들의 인식을 분석함으로써 융합 관련 학과의 교육과정 개정에 방향을 제시한다는 점에서 의미가 있다. 구체적으로, 교육 도구 활용에 대한 어려움이나 인지적 부담을 줄이는 방향으로 교육과정을 설계해야 한다. 또한, 교육 도구에 대한 학생들의 사전 경험과 이해 수준이 교육 성과에 영향을 미칠 수 있다는 점을 감안하여 모듈형 교육과정을 설계해야 한다.