• Smart Structures and Systems
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• 제1권3호
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• pp.283-308
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• 2005

This paper features about the modeling and design of a fast output sampling feedback controller for a smart Timoshenko beam system for a SISO case by considering the first 3 vibratory modes. The beam structure is modeled in state space form using FEM technique and the Timoshenko beam theory by dividing the beam into 4 finite elements and placing the piezoelectric sensor/actuator at one location as a collocated pair, i.e., as surface mounted sensor/actuator, say, at FE position 2. State space models are developed for various aspect ratios by considering the shear effects and the axial displacements. The effects of changing the aspect ratio on the master structure is observed and the performance of the designed FOS controller on the beam system is evaluated for vibration control.

• 철학연구
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• 제87호
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• pp.259-311
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• 2009

이 글은 최근 한국 사회의 학계 안팎에서 두루 사용되고 있는 통섭개념에 대한 비판적 검토를 통해 인문학과 자연과학 사이의 학제적 연구가 어떻게 이루어져야 할지 모색하면서 양자 사이의 학제적 연구가 올바른 방향으로 활발하게 이루어질 수 있는 토대를 마련함을 목표로 한다. 이러한 목표를 위해 필자는 우선 1장에서 이 글의 논의 전개를 위해 필요한 한에서 윌슨의 통섭 개념의 핵심적인 내용을 정리할 것이다. 윌슨은 자연과학적 방법을 사용해 자연과학과 인문학을 하나의 지식 체계로 통섭하는 일이 원칙적으로 가능하다고 주장한다. 그러나 필자의 견해에 의하면 윌슨이 제시하는 통섭의 프로그램은 원칙적으로 완벽하게 수행될 수 없다. 필자는 2장에서 인문학의 다양한 분야의 지식이 가지고 있는 특성을 제시하면서 통섭의 프로그램을 완벽하게 수행하는 일이 원칙적으로 불가능하다는 사실을 해명할 것이다. 거기에 이어 3장에서는 인문학과 자연과학 사이의 학제적 연구가 필요한 이유를 해명하면서 양자 사이의 학제적 연구와 관련해 윌슨의 통섭 프로그램이 가지고 있는 문제점을 검토하고 4장에서는 양자 사이의 학제적 연구에는 어떤 유형의 것이 있을 수 있는지, 그것은 어떤 방식으로 수행될 수 있는지, 그리고 학제적 연구 및 교육 단위는 어떤 방식으로 설정될 수 있을지 하는 등의 문제를 살펴볼 것이다. 5장에서는 앞으로 인문학과 자연과학 사이의 다양한 학제적 활동이 보다 더 탄탄한 토대 위에서 이루어질 수 있도록 하기 위해서는 통섭 개념에 대한 보다 더 철저한 논의와 반성적 성찰이 필요하다는 사실을 지적하면서 이 글의 전체적인 논의를 마무리 지을 것이다.

• Bulletin of the Korean Chemical Society
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• 제34권6호
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• pp.1875-1878
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• 2013

• Bulletin of the Korean Chemical Society
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• 제35권3호
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• pp.949-952
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• 2014

• 한국실내디자인학회논문집
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• 제30호
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• pp.3-8
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• 2002

The purpose of this study is to discuss the issues and problems of interior design education in Korea and to further present guidelines for curriculum development and research on interior design education in Korea for the 21st Century. Content analysis and scholastic inquiry from various sources were used to examine the issues concerning 1) professional identity, 2) curriculum structure, and 3) creative scholarship including interdisciplinary approach. Identification of these issues presented in this study will allow interior design educators to help prepare interior design students who are qualified to lead the profession in the future.

• Journal of Veterinary Science
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• 제19권6호
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• pp.862-864
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• 2018

An elective laparoscopic ovariectomy on a healthy dog revealed a cystic structure in the left ovary. The surgical procedure was successful. Histopathological examination showed the presence of a teratoma adjacent to the ovary. To the best of the authors' knowledge, this is the first reported case of an ovarian teratoma removed by laparoscopic ovariectomy in a dog by using a multiport laparoscopic ovariectomy technique.

• 정보관리학회지
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• 제28권2호
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• pp.37-51
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• 2011

디지털도서관 분야는 컨텐츠, 운영, 기반 기술 관련하여 다양한 분야를 포함하고 있는 학제적 학문분야 중 하나로 여겨진다. 이 연구의 목적은 기존의 문헌정보학 범주 내에서 파악되었던 디지털도서관의 하위분야 규명을 넘어서 다양한 학문 분야에서 다루고 있는 디지털도서관을 학제적 공동연구의 관점에서 분석하고자 하였다. 1997년부터 2010년까지 게재된 디지털도서관 주제의 논문 1,394편을 대상으로 다양한 분야의 공동저자 분석을 수행하였다. 그 분석결과 문헌정보학, 컴퓨터학, 공학 분야가 공동연구의 중심 역할을 수행하였음을 밝혔다. 또한 디지털도서관의 세부영역은 핵심디지털도서관영역, 자연과학영역, 의학관련 영역, 생물학 및 의학영역으로 파악되었다. 이러한 결과는 디지털도서관은 다양한 학문 분야에서 다루고 있으며, 이론중심의 연구뿐만 아니라 구축과 운영과 관련된 실무 영역이 함께 발전된 특징을 지니고 있기 때문인 것으로 파악되었다.

• 생물정신의학
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• 제19권2호
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• pp.77-83
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• 2012

Objectives : Although there have been studies that examine sex differences of the brain structures using magnetic resonance imaging, studies that specifically investigate cerebellar structural differences between men and women are scarce. The purpose of current study was to examine sex differences in structures of the cerebellum using cerebellar template and cerebellum analysis methods. Methods : Sixteen men and twenty women were included in the study. A MATLAB based program (MathWorks, Natick, MA, USA), Statistical Parametric Mapping 5 (SPM5) using the spatially unbiased infra-tentorial atlas template (SUIT) as the cerebellum template, was used to analyze the brain imaging data. Results : There was no significant difference in age between men (mean age=28.1) and women (mean age=27.2). Men showed higher gray matter density than women in two left cerebellar areas including the clusters in the lobules IV and V (a cluster located across the lobules IV and V), and the lobule VIIIb (lobules IV and V, t=4.75, p<0.001 ; lobule VIIIb, t=3.08, p=0.004). Conclusions : The current study found differences in cerebellar gray matter density between men and women. The current study holds its significance for applying the template specifically developed for the analysis of cerebellum.

• Reproductive and Developmental Biology
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• 제35권2호
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• pp.159-165
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• 2011

To explore the role of histone deactylase (HDAC) activation in an in vivo model of hypertrophy, we studied the effects of Trichostatin A (TSA). TSA subjected to thoracic aortic banding (TAB)-induced pressure stress in mice. In histological observations, TAB in treated mice showed a significant hypertrophic response, whereas the sham operation remained nearly normal structure with partially blunted hypertrophy. TSA treatment had no effect (measured as HW/BW) on sham-operated animals. TAB animals treated with vehicle manifested a robust ~50% hypertrophic response (p<0.05 vs sham). TAB mice treated with 2 mg/kg/day TSA manifested a blunted growth responses, which was significantly diminished (p<0.05) compared with vehicle-treated TAB mice. TAB mice treated with a lower dose of TSA (0.5 mg/kg/day) manifested a similar blunting of hypertrophic growth (~25% increase in heart mass). Furthermore, to determine activity duration of TSA in vitro, 1 nM TSA was added to H9c2 cells. Histone acetylation was initiated at 4 hr after treatment, and it was peak up to 18 hr, then followed by significantly reduced to 30 hr. We also analyzed the expression of p53 following TSA treatment, wherein p53 expression was elevated at 4 hr, and it was maintained to 24 hr after treatment. ERK was activated at 8 hr, and maintained till 30 hr after treatment suggesting an intracellular signaling interaction between TSA and p53 expression Taken together, it is suggested that HDAC activation is required for pressure-overload growth of the heart. Eventually, these data suggest that histone acetylation may be a novel target for therapeutic intervention in pressure-overloaded cardiac hypertrophy.

• 한국기계가공학회지
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• 제20권2호
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• pp.107-119
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• 2021

The cross-flow turbine is one of the most famous and widely used hydraulic power systems for a long time. The cross-flow turbine is especially popular in many countries and remote regions where off-grided because of its many benefits such as low cost, high efficiency at low head, simple structure, and easy maintenance. However, most modern turbines, including the cross-flow turbine, are unsuitable for the ultra-low head situation, known as less than 3m water head or zero head with over 0.5m/s flow velocity. In this study, we demonstrated a 20kW class inverted-type cross-flow turbine's performance. First, we reevaluated our previous studies and introduced how to design the inverted-type cross-flow turbine. Secondly, we fabricated the 20kW class inverted-type cross-flow turbine for the performance test. And then, we designed a testbed and installed the turbine system in the demonstration facility. In the end, we compare the demonstration with its previous CFD results. The comparing result shows that both CFD and real model fitted on guide vane angle at 10 degrees. At the demonstration, we achieved 42% turbine efficiency at runner speed 125 RPM.