• 디지털융복합연구
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• 제11권10호
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• pp.59-69
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• 2013

우리나라 20대의 고용률은 57%로 최근 4년래 최저치에 머물고 있다. 대졸자들이 몰려 있는 25~29세의 실질 실업률은 20%를 웃돈다는 분석도 있을 만큼 청년실업 문제는 심각하다. 이에 따라 산학협력 활성화는 이제 이러한 국가현안을 해결해주는 주요한 수단으로 인식되고 있으며, 향후 정부정책이나 국가지표에서 더욱 관심과 지원을 받게 될 것이 분명해 보인다. 정부는 2012년부터 '산학협력선도대학 육성사업'(LINC: Leaders in INdustry-university Cooperation)을 추진함으로써 기업이 요구하는 인력양성, 실제적인 연구개발 및 기술이전을 활성화시키고 대학-산업체-연구기관간의 유기적인 상호연계를 바탕으로 지역대학과 산업의 동반성장을 위해 다양한 산학협력 선도모델을 창출-확산시키고 있다. 이러한 배경하여 본 연구의 목적은 대학에서 현장밀착형 인재를 발굴 육성하는데 필수적인 현장밀착형 교과과정 개발에 관한 것이다. 따라서 본 연구에서는 전공학과(부)별 실시한 전공교과과정 수요조사 결과를 바탕으로 산학협력을 확산하기 위한 현장밀착형 교과과정을 분석하고 연차별, 영역별 추진방안을 제안하였다.

• 천문학회지
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• 제25권1호
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• pp.47-64
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• 1992

Cores of globular clusters are an ideal place for close encounters between stars. The outcome of tidal capture can be stellar mergers, close binaries between normal stars (W UMa type), cataclysmic variables composed of white dwarf and normal star pairs, or low-mass X-ray binaries consisting of a neutron star and a normal star pairs. Stellar mergers can be the origin of blue stragglers in dense globular clusters although they are hard to observe. Low mass X-ray binaries would eventually become binary pulsars with short pulse periods after the neutron stars accrete sufficient amount of matter from the companion. However, large number of recently discovered, isolated millisecond pulsars (as opposed to binary pulsars) in globular clusters may imply that they do not have to gain angular speeds during the X-ray binary phase. We propose that these isolated millisecond pulsars may have formed through the disruptive encounters, which lead to the formation of accretion disk without Roche lobe filling companion, between a neutron star and a main-sequence star. Based on recently developed multicomponent models for the dynamical evolution of globular clusters, we compute the expected numbers of various systems formed by tidal capture as a function of time.

• 대한기계학회논문집A
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• 제20권6호
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• pp.1762-1772
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• 1996

The main objective of this study is to develop a gripper mechanixm that can be employed for assembly and removal tasks of a nozzle-dam of steam genetator in the process of the nuclear reactor maintenances. Brief description of the open-close thpe gripper mechanism, its position analysis, and its kinematic analysis are given. The optimal design of the gripper mechanism with and without slipping on its two gipping surfaces is considered. As an optimal design index, the ratio of the actuator force of prismatic cylinder to gripping load is proposed. Then, based on this index the oiptimal design is carried out to identify values of optimal design parameters for the gripper dechanism.

• Journal of Astronomy and Space Sciences
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• 제8권1호
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• pp.73-83
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• 1991

조기형 근접쌍성 AQ Cas를 1982년부터 1989년까지 (총 91일 밤) 연세대학교 천문대 일산 관측소에서 관측하여 UBV 광도곡선을 완성하였다. U의 광도곡선으로부터 두 별사이에 물질이동으로 인하여 위상 0.55와 0.90근처에서 광도가 어두워지는 현상을 확인하였다. 우리의 관측점으로 4개의 식심시각을 결정하였고, 수집한 식심 시각을 가지고 새로운 광도요소를 얻었다. 또한, BV 광도곡선을 가지고 Wilson-Devinney 계산법으로 측광 궤도요소들을 구하였다.

• 대한기계학회논문집A
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• 제31권3호
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• pp.380-387
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• 2007

We carried out an image analysis of living cells forming their contacts at the bottom of the cell culturing substrate. In order to visualize the contact area selectively, we adopted total-internal-reflection-fluorescence (TIRF) method, which can illuminate the specimen volume within only several hundred nano-meters above the substrate. From the fluorescent intensity of the TRF image, we could calculate the distance of the cell surface from the substrate. As a result, we visualized the origin of cell contacts, their movements, and the change of cell-contact type from the close-contact into focal-contact with information of its vertical displacement representing the temporal evolution process of the three-dimensional cell-surface-profile near the contact area during this metamorphosis.

• Animal cells and systems
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• 제8권2호
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• pp.71-75
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• 2004

A study on marine sponges was conducted by SCUBA diving at Ulleungdo Island, Korea, from July 2001 to August 2003. Two species, Mycale (Naviculina) ulleugensis and Mycale (N.) neunggulensis, are new to science. Mycale (N.) ulleugensis n. sp. seems close to M. chungae based on the shape of spicules, but differs in the size of megascleres and sigmas, Mycale (N.) neunggulensis n. sp. seems close to M. flagellifer Vacelet and Vasseur in the type and size of spicules, but differs in the shape of naviculichela. Naviculichela I of M. flagellifer has a spine on the upper part of the felix.

• 천문학논총
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• 제30권2호
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• pp.289-292
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• 2015

Most of the stars in the Galaxy are in binary systems. Binaries should be possible as the hosting stars of planets. Searching for planetary companions to binaries, especially evolved close binary stars, can provide insight into the formation and the ultimate fate of circumbinary planets and shed light on the late evolution of binary stars. In order to do this, we have chosen some post common envelope binaries including sdB-type eclipsing binaries and detached WD+dM eclipsing binaries as our targets and monitored them for several years. In this paper, we will present some of our new observations and results for three targets, NSVS 07826147, NSVS14256825 and RR Cae.

• Nuclear Engineering and Technology
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• 제36권6호
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• pp.497-511
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• 2004

A PSV (pressurizer safety valve) popping test carried out in the early phases of a refueling outage may trigger a test-induced LOCA(loss of coolant accident) if a PSV fails to fully close and is stuck in a partially open position. According to a KSNP (Korea standard nuclear power plant) low power and shutdown PSA (probabilistic safety assessment), the failure of a high pressure safety injection (HPSI) accompanied by the failure of a PSV to fully close was identified as a dominant accident sequence with a significant impact on low power and shutdown risks (LPSR). In this study, we aim to investigate and verify a new means for mitigating this type of accident using a thermal-hydraulic analysis. In particular, we explore the applicability of an aggressive cool-down combined with operator actions. The results of the various sensitivity studies performed there will help reduce LPSR and improve Refueling outage safety.

• 천문학회보
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• 제44권1호
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• pp.47.4-47.4
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• 2019

Recent observations on the double red clumps in the bulge validate the close connection in stellar populations between Galactic globular clusters (GCs) and the Milky Way (MW) bulge. Intriguingly, diverse phenomena observed in early-type galaxies (ETGs) and their GC systems are also indicating the similarities with Galactic GCs with multiple populations. Here, we present the population synthesis for the Galactic bulge and ETGs using stellar populations observed in the Galactic GCs with multiple populations. Our new models well explain observations of both the MW bulge and ETGs. Also, the inclusion of GC-originated population to the population synthesis model shows substantial impacts on the age-dating of stellar populations. The implication of this result for the interpretation of the formation history and the age-dating of ETGs will be discussed in detail.

• 한국관개배수논문집
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• 제21권1호
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• pp.109-117
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• 2014

Multi water-loop system is the efficient customer centered facilities of water supply by utilizing the multi water resources. Multi water-loop system is divided into various types. The system is classified potable and non-potable type. Mostly, the potable type utilizes surface water and ground water. However, the non-potable type utilize the multi water resources, such as rain water, sea water, reclaimed water, etc. Selective intake is possible when characteristics of region, physiographic condition and purpose of use are considered. For instance, downtown type, new-city type, agriculture type, island type are available. For development and application of these multi water-loop system, standardization is needed. For standardization, several methods are given; design principles, selection and composition method of multi water-loop system structure, BIM/GIS application method, safety inspection method. Consequently, a road map of design standardization method can be established. In this road map, there are three parts for the standardization of multi water-loop system. Three parts are the considerations, base material and ways of standardization. Design standardization become close when this road map followed by someone who plan the multi water-loop system. In this way, loop system's development is more efficient and economic. In hereafter research, each type's characteristic will be analysed and standardization methods can be established.