• 한국축산시설환경학회지
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• 제18권3호
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• pp.157-164
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• 2012

동물복지관점에서 많은 비난을 받아왔던 관행적 분만틀의 사용을 배제하고 넓은 분만시설의 면적의 제공이 모돈의 생산성 및 자돈의 성장능력에 미치는 영향을 좁은 분만시설로서 분만틀을 이용하여 비교하였다. 1. 좁은 분만시설과 넓은 분만시설에서 모돈의 사료섭취량, 등지방 두께, 그리고 체평점에는 아무런 차이가 없었다. 하지만 이유시와 분만시 등지방 두께와 체평점의 차이는 넓은 분만시설에서 유의적으로 감소하였다. 또한 모돈의 재귀발정일도 좁은 분만시설보다 넓은 분만시설에서 유의적으로 감소하였다. 2. 모돈의 분만능력은 분만시설의 면적에 의한 영향은 없었다. 하지만 넓은 분만시설 에서 분만전 모돈의 행동 자유가 분만시 신생자돈의 생존율에 영향하는 것으로 나타났다. 3. 분만시설 면적에 따른 차이는 이유자돈수, 자돈의 증체량에는 아무런 영향이 없었으나 넓은 분만시설에서 자돈의 폐사율이 증가하는 것으로 나타났다. 이상의 결과로부터, 모돈의 복지를 위해 넓은 분만시설은 모돈의 번식능력에는 효과가 있었으나 자돈의 폐사율 증가라는 생산성의 관점에서는 다소 불리한 것으로 판단되며 또한 자돈의 폐사율 증가에 대한 원인을 모돈과 자돈의 행동학적 관점에서 면밀히 연구할 필요가 있을 것으로 판단된다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2012년도 제45회 KOSCO SYMPOSIUM 초록집
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• pp.323-324
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• 2012

Flammability limits of opposed flow diffusion flame in a narrow channel was investigated experimentally and theoretically. There were three different extinction modes corresponding to high strain rate (HSR), low strain rate (LSR) and dilution ratio (DR) limits. To investigate these limits, a theoretical study was followed by focusing on flow and heat transfer characteristics. Consequently, a dead space concept that has been used for premixed flames was important to reveal the heat loss mechanism in a narrow channel especially for LSR conditions even in the case of diffusion flames.

• 한국재난정보학회 논문집
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• 제12권3호
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• pp.210-218
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• 2016

본 연구에서는 화재 해석 프로그램인 FDS와 Pathfinder를 이용하여 협소 거주공간의 사고재현을 위해 테스트베드의 화재를 시뮬레이션하였다. 해석 결과, 내부 구조 형태가 H형태인 경우가 피난대피 시간이 285초로 가장 빠르게 나타났다. 또한 실험 조건 중 출입구가 닫히고 스프링클러가 작동하는 경우가 온도의 분포가 가장 낮게 나타났으며, 이는 가시도와 연기농도에도 큰 영향을 끼치는 것으로 나타났다.

• 한국산업융합학회 논문집
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• 제22권3호
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• pp.281-292
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• 2019

This paper proposed a new technology to control a path forging parts in limited narrow space of manufacturing process automation for smart factory. In the motion control, we adapted the obstacle avoidance technology based on ultrasonic sensors. The new motion control performance test for a mobile robot is experimented in narrow space environments. The travelling path control is performed by a fuzzy control logic. which plays a role for selecting an appropriate behavior in accordance with the situation in the vicinity of the mobile robot. Ultrasonic sensors installed at the front face of the mobile robot are used. In order to update the current position and heading angle of the mobile robot, a new approch is adapted. The reliability is illustrated by simulation and experiments.

• 로봇학회논문지
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• 제16권4호
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• pp.291-298
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• 2021

In this study, we present a multi-sensor module for snake robot searching survivors in a narrow space. To this end, we integrated five sensor systems by considering the opinions of the first responders: a gas sensor to detect CO₂ gases from the exhalation of survivors, a CMOS camera to provide the image of survivors, an IR camera to see in the dark & smoky environment, two microphones to detect the voice of survivors, and an IMU to recognize the approximate location and direction of the robot and survivors. Furthermore, we integrated a speaker into the sensor module system to provide a communication channel between the first responders and survivors. To integrated all these mechatronics systems in a small, compact snake head, we optimized the positions of the sensors and designed a stacked structure for the whole system. We also developed a user-friendly GUI to show the information from the proposed sensor systems visually. Experimental results verified the searching function of the proposed sensor module system.

• 천문학논총
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• 제21권2호
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• pp.21-26
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• 2006

A Korean team (Korea Astronomy and Space Science Institute, Korea Basic Science Institute, and Kyung Hee University) takes part in an international cooperation project called CIBER (Cosmic Infrared Background ExpeRiment), which has begun with Jet Propulsion Laboratory (JPL) in USA and Institute of Space and Astronautical Science (ISAS) in Japan. CIBER is a rocket-borne instrument, of which the scientific goal is to measure the cosmic near-infrared extra-galactic background to search for signatures of primordial galaxy formation. CIBER consists of a wide-field two-color camera, a low-resolution absolute spectrometer, and a high-resolution narrow-band imaging spectrometer. The Korean team is in charge of the ground support electronics and manufacturing of optical parts of the narrow-band spectrometer, which will provide excellent opportunities for science and technology to Korean infrared groups.

• 교육녹색환경연구
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• 제18권1호
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• pp.49-61
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• 2019

이 연구에서는 부지 협소 초등학교 건축 계획 지침에 주는 시사점을 도출하기 위하여 서울특별시에 위치한 부지 협소 초등학교 두 곳의 교직원을 대상으로 면담을 실시하여 현존하는 부지 협소 초등학교의 문제점과 신설 부지 협소 초등학교 시설에 대한 요구를 조사하였다. 조사 결과, 부지 협소 초등학교에 설치된 운동장 대용 공간들은 신체 놀이 활동과 체육 수업 및 기타 교육과정 운영에 적합하지 않은 것으로 밝혀졌다. 이에 교직원들은 초등학교에 적합한 신체 활동 공간 확보를 위하여 학교 건물의 한 층 전체나 옥상 전체를 체육 활동 공간화 할 것을 요구하고 있었다. 또한 부지 협소 초등학교에는 소음 발생, 특별실 부족, 공용 공간 부족 등의 문제가 발생하고 있었는데 이 문제는 부지가 협소한 학교에 과밀한 학생이 수용됨으로써 악화되고 있으므로 부지 협소 초등학교의 경우에 적정 수의 학생이 유지될 수 있도록 하는 정책을 필요로 한다.

• 한국농촌건축학회논문집
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• 제22권2호
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• pp.1-8
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• 2020

This study is intended to derive the adaptive reuse techniques through the history and aspects of new construction, extension, repair, and other works, limited to the deep and narrow lots facing Seongan-gil and Nammun-gil in Nammun-ro 2 ga of Cheongju, the historic urban area. The results are as follows. 1) In the case of newly built reinforced concrete buildings, the central part of the top floor of the residence or all floors are opened to the open space(void) to facilitate lighting and ventilation. This is developed as a convection phenomenon due to the temperature difference from the slits between buildings, which affects the entire air flow of the block. 2) The buildings of extension and repair are composed of two-story masonry or steel frame, both the front store facing the road and the house on the back, but it looks like one because it is in contact with each other. If only a small gap between the front and rear buildings is restored to an external space or a space equipped with sun light, a small breath can be provided in lighting and ventilation. 3) The existing two-story wooden stores and houses have lost their external space due to repairs. With minimal intervention to restore the small courtyard, slits, and space under the eaves, it will not only improve lighting and ventilation, but also create a unique appearance as a segment of the elongated store.

• Smart Structures and Systems
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• 제11권1호
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• pp.123-134
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• 2013

Identifying structural modal parameters, especially those modes within high frequency range, from ambient data is still a challenging problem due to various kinds of uncertainty involved in vibration measurements. A procedure applying an ensemble empirical mode decomposition (EEMD) method is proposed for accurate and robust structural modal identification. In the proposed method, the EEMD process is first implemented to decompose the original ambient data to a set of intrinsic mode functions (IMFs), which are zero-mean time series with energy in narrow frequency bands. Subsequently, a Sub-PolyMAX method is performed in narrow frequency bands by using IMFs as primary data for structural modal identification. The merit of the proposed method is that it performs structural identification in narrow frequency bands (take IMFs as primary data), unlike the traditional method in the whole frequency space (take original measurements as primary data), thus it produces more accurate identification results. A numerical example and a multiple-span continuous steel bridge have been investigated to verify the effectiveness of the proposed method.

• 천문학회보
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• 제17권
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• pp.14.2-14.2
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• 1992