• 기록학연구
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• 제39호
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• pp.73-100
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• 2014

한 사회가 지속적으로 유지되기 위해서는 지난 과거의 기억을 현재화하여 문화적 기억으로 생산해내는 것을 필요로 한다. 과거와 현재가 갖는 시간적 격차에 의한 망각의 상황은 흔히 기념일이나 기념 공간 등으로 현재화되고 있다. 각기 반영하는 재현 형식은 다르지만 지나간 과거가 어떻게 기억되고 어떻게 형성할 것인가와 관련되어 있다. 기록, 특히 국가가 확보한 진본 기록은 지나간 현재에 대하여 지금의 현재에 설득이 가능한 증거라는 존재론적 특징을 가지며 근원적 객관성에서 연원한 신뢰감이 내재되어 있다. 따라서 기록이 가진 이러한 엄정함이 만들어내는 이미지는 시각적 전시 행위를 통해 구체적 기억의 촉발성을 구현한다. 이러한 논의를 바탕으로 재현 공간에서 과거를 이해하는데 국가 기록, 특히 사진기록의 의미와 전시 활용 효과를 살펴보았다.

• 천문학회지
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• 제34권3호
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• pp.129-135
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• 2001

We report results from an analysis of the X-ray archival data on MCG-2-58-22 obtained with Ginga, ROSAT and ASCA. By analyzing both short- and long-term light curves, we find clear time variations, ranging widely from, $\~10^3$ s to more than several years, in the X-ray energy range 0.1 - 10 keV. In addition, a flare is detected in 1991, overlaid on a gradual, secular flux decrease from 1979 to 1993; this flare has a time scale of about 1 year, and the X-ray flux increased by at least a factor of 3. The implications of these observational results are discussed in terms of accretion flow dynamics near a supermassive black hole.

• 기록학연구
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• 제5호
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• pp.3-37
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• 2002

Today the market of EDMS is esteemed more than 100 billions won. It signifies a comming of age of electronic records. The traditional archival theories which are based on the paper records are confronted with a new challenge. In some leading countries of archival studies reorientation of archives management has been tried by a number of distinguished specialists such as Bearman and Hedstrom since 10 years. As a consequence new paradigm of archival theories has been developed. Also in Korea this new paradigm has been introduced by some expert such as Lee, Sang-Min, Sul, Moon-won, Lee, Seung-Eok. However their arguments are too general to offer a concrete clue for new paradigm. Faced by new age of electronic records, it's important to start a discussion for the reasonable methods of electronic records management at once. The most drastically changed part of record management by the electronic technique is the life-cycle of records. The commonly practiced three-stage life-cycle is to be reduced to the two-stage life-cycle, and the concept of the spatial movement of records is to be changed. It can be also pointed that the public emerges as user from the early creating stage of records beyond time and space. Thus is can be said that the method of the management features dynamic and cohesive. The method of appraisal must be also changed and reproduced, so that it can reflect the various levels considering dynamics of the electronic records. Supposedly it will be a core factor that causes the change of methodology in records management with the change of life-cycle theory. It must be noted that various subjects would be involved in the work of classification and description over time and space and that feedback between them is of important. Description also tends to be made at the crating stage of records and structured dynamically. It results from the change of life-cycle and the introduction of the concept of continuum. Such trend allows us to start discussions on the assumption that description of both creator and archival professionals act together an important role. Of course, it is linked with the methodology in which most descriptions are made automatically at the early drafting stage of the structure. The meat date is formed on the assumption that there should be feedback between areas of automatic description, description of creators and archival professionals. The most important thing in description is to develop a suitable way how it is structured. An alternative must be offered for managing data set. As iweb that is being operated by Myongji university shows, records created in daily business are managed not as electronic records but as date base. This is because they exist outside the repository in the EDMS system. Since data set often has various sources, an alternative for classification needs to be developed. It is now likely that database is filed according to the created year to be transferred automatically to the repository. Over a long-term the total management of database, electronic records and electronic information will be a topic. A right direction of new paradigm will be found for both iweb and E-government, when practice and studies of theories are combined and interacted.

• Smart Structures and Systems
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• 제25권6호
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• pp.733-749
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• 2020

This study presents a computer vision-based approach for representing time evolution of structural damages leveraging a database of inspection images. Spatially incoherent but temporally sorted archival images captured by robotic cameras are exploited to represent the damage evolution over a long period of time. An access to a sequence of time-stamped inspection data recording the damage growth dynamics is premised to this end. Identification of a structural defect in the most recent inspection data set triggers an exhaustive search into the images collected during the previous inspections looking for correspondences based on spatial proximity. This is followed by a view synthesis from multiple candidate images resulting in a single reconstruction for each inspection round. Cracks on concrete surface are used as a case study to demonstrate the feasibility of this approach. Once the chronology is established, the damage severity is quantified at various levels of time scale documenting its progression through time. The proposed scheme enables the prediction of damage severity at a future point in time providing a scope for preemptive measures against imminent structural failure. On the whole, it is believed that the present study will immensely benefit the structural inspectors by introducing the time dimension into the autonomous condition assessment pipeline.

• Tribology and Lubricants
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• 제36권4호
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• pp.215-231
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• 2020

The paper presents extensive survey and review of experimental and analytical researches on fluid film bearings and squeeze film dampers (SFDs) for turbomachinery available in open literature (major archival international journals) published recently (2018 and 2019 only). Over 60 published research works are reviewed based on the research topics and objectives, the types of bearings, size of bearings, and main design parameters with a brief summary of experiments and/or predictions in each work. Some important findings and general observations about the experimental and/or predictive data are also presented. There are several major trends observed throughout the survey. A large portion of the papers focuses on bearing surface textures and effect of operating and assembly conditions on static and/or dynamic forced performances, as well as bearing surface roughness and wear patterns. Researches on geometry of orifices and recesses in hydrostatic (or hybrid) bearings, as well as bearing system stability predictions using thermohydrodynamic analysis and computational fluid dynamics (CFD), are considered as significant topics. Studies on SFDs mainly focus on experimental identification of force coefficients for various SFD geometries and sealing conditions. Reliable experiments of fluid film bearings and SFDs along with the development of experimentally benchmarked predictive tools enable reinforcement of the path for reliable implementations of the bearing components into high performance rotating machinery operating at extreme and harsh conditions. The extensive list of sources of recent experiments in the available open literature is a welcome addition to the analytical community to gauge the accuracy of predictive tools.

• 천문학회보
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• 제35권2호
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• pp.84.1-84.1
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• 2010

Globular clusters (GCs) are known to be one of the oldest objects in the Milky Way. Therefore the dynamical informations of GCs are very important to understand the formation and evolution of our Galaxy. Motion of GCs in the halo of Galaxy can be traced by radial velocities of individual stars and proper motions of GCs. Measuring the radial velocities of stars in GCs has been challenging for decades because the brightness of stars (even for the brightest stars) in GCs are too faint (V>14) to measure the radial velocities. The available large telescopes (D>4m) enable us to observe the spectra of stars in the red giant branch of GCs, and it is now more plausible to measure the radial velocities of stars in GCs. On the contrary it is still very difficult to measure the sky-projected two-dimensional motion of GCs in Galaxy even with the large telescopes because the distance to GCs is quite large (~10kpc) compared to the spatial resolution of present-day large ground-based telescopes. Instruments on-board Hubble Space Telescope are ideal to study the proper motion of GCs thanks to their extremely high spatial resolution (~0.05arcsec). We report a study of proper motion of NGC 104, one of the most metal-rich Milky Way GCs, based-on archival images of NGC 104 observed using HST/ACS. Using the stars in Small Magellanic Cloud as reference coordinate, we are able to measure the proper motions of individual stars in NGC 104 with a high precision. We discuss the internal dynamics of stars in NGC 104 by comparing proper motion results based-on shorter (<1yr) and longer (~7yrs) time durations.

• 기록학연구
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• 제59호
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• pp.207-275
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• 2019

서울시자살예방센터(자살유족지원팀)와 자살유족 기록작업을 같이 했다. 자살유족지원팀은 자살유족의 심리지원을 위한 자조모임을 운영하고 있었다. 자조모임은 자살유족들이 모여 앉아 대화를 나누며 고통을 나누는 자리이다. 자조모임이 어느 정도 진행되자 모임에서 리더역할을 수행하는 성원들이 생겼다. 이들이 모여서 글을 쓰는 에세이 모임을 구성했다. 아들을 먼저 보낸 아버지(2명), 딸을 먼저 보낸 엄마(2명), 아들을 먼저 보낸 엄마(1명), 남편을 먼저 보낸 아내(1명). 이렇게 6명의 사람들이었다. 에세이 모임은 사직공원 앞에 자리를 잡은 한 공간에서 매주 만났다. 한쪽 벽면 전체를 차지하는 창문으로는 저녁이 들어오고 있었다. 낮에 있었던 일들은 지는 해를 따라 갔다. 10명(에세이 모임 6명, 자살유족지원팀 3명, 임상역사가 1명)이 탁자를 가운데 두고는 빙 둘러 앉았다. "자, 이제 무엇을 해야 할까?" 자살유족 기록작업은 2013~2014년에 있었다. 교육적으로 중요하고 특수한 환자의 임상사례를 학회, 잡지에 보고하는 것을 의학에서는 증례(證例. case report)라고 한다. 자살유족들과 같이 했던 기록작업을 증례로 소개하는 형식을 취해 정리했다. 증례 형식을 취한 것은 기록을 말하기 위해서는 인간을 말해야 하고, 인간을 말하기 위해서는 기록에 대해 말해야 하는 '인간과 기록의 상관성'이 중요하다고 보기 때문이다. 자살유족 기록작업에 대한 글이 이런 상관성에 대한 논의를 하는 데에 단초가 될 수 있다고 본다. 몇 년의 시간이 지났다. 당시 상황을 기록하는 데 필요한 객관적 거리가 확보되었을까? 그건 자신할 수 없지만, 작업의 과정과 방법을 서술하면서 '일상의 기록생산'에 대해 말해본다. 나아가 기록과 기록의 의미(인간)에 관한 몇 가지 단상을 말해본다. 1장에서는 기록의 출처를 다루었다. 그것은 기록하는 사람은 누구인가, 또는 누가 기록하는가 하는 것이다. 기록이 무엇인가 보다는 기록하는 사람은 누구인가 하는 물음이 앞서야 할 것 같다. 2장은 기록하는 형식에 관한 논의로 무엇을 위해 기록하는가, 무엇을 기록화 대상으로 삼는가, 어떤 기록형식이 필요한가 하는 것을 다뤘다. 3장과 4장은 일종의 기록방법론일 수 있는데, 3장에서는 쓰기, 4장에서는 대화를 다뤘다. 5장에서는 기록을 수용하는 의례를 다뤘다. 3개월이든 1년이든 자신이 기록했던 시간을 어떻게 수용하며 그 의미는 무엇일까 하는 것이다. 6장에서는 논의의 지평을 넓혀 일상의 기록생산, 일상적 아카이브를 다뤘다.