• 국제초고층학회논문집
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• 제7권1호
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• pp.17-32
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• 2018

This paper explores the function of a structural skin with an embossed surface applicable to use for tall building structures. The major diagrid system with a secondary embossed surface structure provides an enhanced perimeter structural system by increasing tube section areas and reduces aerodynamic loads by disorienting major organized structure of winds. A parametric study used to investigate an optimized configuration of the embossed structure revealed that the embossed structure has a structural advantage in stiffening the structure, reducing lateral drift to 90% compared to a non-embossed diagrid baseline model, and results of wind load analysis using computational fluid dynamics, demonstrated the proposed embossed system can reduce. The resulting undulating embossed skin geometry presents both opportunities for incorporating versatile interior environments as well as unique challenges for daylighting and thermal control of the envelope. Solar and thermal control requires multiple daylighting solutions to address each local façade surface condition in order to reduce energy loads and meet occupant comfort standards. These findings illustrate that although more complex in geometry, architects and engineers can produce tall buildings that have less impact on our environment by utilizing structural forms that reduce structural steel needed for stiffening, thus reducing embodied $CO^2$, while positively affecting indoor quality and energy performance, all possible while creating a unique urban iconography derived from the performance of building skin.

• 한국물환경학회지
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• 제22권1호
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• pp.23-29
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• 2006

Biosorption technology was used to remove hazardous materials from wastewater, herbicide, heavy metals, and radioactive compounds, based on binding capacities of various biological materials. Biosorption process can be explained by two steps; the first step is that target contaminants is in contact with microorganisms and the second is that the adsorbed target contaminants is infiltrated with inner cell through metabolically mediated or physico-chemical pathways of uptake. Until recently, no information is available to explain the definitive mechanism of biosorption. The purpose of this study is to evaluate biosorption capabilities of organic matters using activated sludge and to investigate affecting factors upon biosorption. Over 49% of organic matter could be removed by positive biosorption reaction under anoxic condition within 10 minutes. The biosorption capacities were constant at around 50 mg-COD/mg-MLSS for all batch experiments. As starvation time increased under aerobic or anaerobic conditions, biosorption capacity increased since higher stressed microorganisms by starvation was more brisk. Starvation stress of microorganisms was higher at aerobic condition than anaerobic one. As temperature increased or easily biodegradable carbon sources were used, biosorption capacities increased. Consequently, biosorption can be estimated by biological -adsorbed capability of the bacterial cell-wall and we can achieve the cost-effective and non -residual denitrification with applying biosorption to the bio-reduction of nitrate.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2009년도 한국우주과학회보 제18권2호
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• pp.28.4-29
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• 2009

The 'Amon-Ra' instrument of the proposed 'EARTHSHINE' satellite is a dual (i.e. imaging and energy) channel instrument for monitoring the total solar irradiance (TSI) and the Earth's irradiance at around the L1 halo orbit. Earlier studies for this instrument include, but not limited to, design and construction of breadboard Amon-Ra imaging channel, stray light suppression and system performance computation using Integrated Ray Tracing (IRT) technique. The Amon-Ra instrument is required to produce 0.3% in uncertainty for both Sunlight and Earthlight measurement. In this study, we report accurate estimation of the output electric signal derived from the orbital variation of radiant exitance from the Sun and the Earth arriving at the aperture and detector plane of the Amon-Ra. For this, orbital irradiance are computed analytically first and then confirmed by simulation using Integrated Ray Tracing (IRT) model. Specially, the results show the arriving power at the bolometer detector surface is $1.24{\mu}W$ for the Sunlight and $1.28{\mu}W$ for the Earthlight, producing the output signal pulses of 34.31 mV and 35.47 mV respectively. These results demonstrate successfully that the arriving radiative power is well within the bolometer detector dynamic range and, therefore, the proposed detector can be used for the in-orbit measurement sequence. We discuss the computational details and implications as well as the simulation results.

• 한국경제지리학회지
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• 제6권2호
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• pp.471-486
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• 2003

도심 부흥 및 재개발로서 나타나는 젠트리피케이션은 도심 및 이너시티에서 일어나는 인구 및 사회적 구성의 변화와 부동산의 물리적.경제적 특성 변화를 포괄한다. 1970년대 이후 젠트리피케이션은 학문적으로 많은 조명을 받아왔고 동시에 도시지리학 분야내 이론 및 이념 논쟁의 장을 제공하였다. 이러한 맥락에서 본고는 그러한 논쟁에 참여해온, 젠트리피케이션에 대한 두 가지 접근, 즉 소비중심 접근과 생산중심 접근을 논의하였다. 구체적으로 각각의 접근을 대표하는 데이비드 레이와 닐 스미쓰의 젠트리피케이션에 관한 연구를 재고찰하고 비판적으로 평가하였다. 특히 1980년대에 출간된 레이와 스미쓰의 연구를 중심으로 하여, 각각의 접근방법론이 젠트리피케이션에 대한 부분적 설명에 그치고 있음을 중점적으로 논의하였다.

• 대한치과교정학회지
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• 제46권5호
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• pp.290-300
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• 2016

Objective: This study aimed to (1) evaluate the effects of maxillary second and third molar eruption status on the distalization of first molars with a modified palatal anchorage plate (MPAP), and (2) compare the results to the outcomes of the use of a pendulum and that of a headgear using three-dimensional finite element analysis. Methods: Three eruption stages were established: an erupting second molar at the cervical one-third of the first molar root (Stage 1), a fully erupted second molar (Stage 2), and an erupting third molar at the cervical one-third of the second molar root (Stage 3). Retraction forces were applied via three anchorage appliance models: an MPAP with bracket and archwire, a bone-anchored pendulum appliance, and cervical-pull headgear. Results: An MPAP showed greater root movement of the first molar than crown movement, and this was more noticeable in Stages 2 and 3. With the other devices, the first molar showed distal tipping. Transversely, the first molar had mesial-out rotation with headgear and mesial-in rotation with the other devices. Vertically, the first molar was intruded with an MPAP, and extruded with the other appliances. Conclusions: The second molar eruption stage had an effect on molar distalization, but the third molar follicle had no effect. The application of an MPAP may be an effective treatment option for maxillary molar distalization.

• 한국입자에어로졸학회지
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• 제10권1호
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• pp.1-8
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• 2014

In this study, we have developed a real-time monitoring device for measuring $PM_{10/2.5/1}$ of ambient aerosol particles. The real-time PM (Particulate Matter) monitor was based on the light scattering method and had 16 channels in particle size. The laboratory and field tests were carried out to evaluate the performance of the PM monitor developed. Arizona Road Dust particles ranging from diameter of 0.1 to $20{\mu}m$ were generated as test particles in the laboratory test. The field test was carried out at the Seoul Meteorological Observatory. We can obtain the particle size and number concentration (particle size distribution) only from the real-time PM monitor developed. Therefore, the average density of aerosol particles was used to obtain the PM data from the particle size distribution. The $PM_{10/2.5/1}$ results of the PM monitor were compared with the data of the Grimm Dust Monitor (Model 1.108) and a beta ray gauge (Thermo Fisher Scientific). As a result, it was shown that the $PM_{10/2.5/1}$ results obtained by the real-time PM monitor agreed well with the data of the reference devices, and overall, the real-time PM monitor could be used as a PM monitoring device for real-time monitoring of the ambient particles.

• 천문학회지
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• 제48권6호
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• pp.343-355
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• 2015

There is much observational evidence that active star formation is taking place in the Hii regions Sh 2-255 – 257. We present a photometric study of this star forming region (SFR) using imaging data obtained in passbands from the optical to the mid-infrared, in order to study the star formation process. A total of 218 members were identified using various selection criteria based on their observational properties. The SFR is reddened by at least E(B −V ) = 0.8 mag, and the reddening law toward the region is normal (R_V = 3.1). From the zero-age main sequence fitting method it is confirmed that the SFR is 2.1 ± 0.3 kpc from the Sun. The median age of the identified members is estimated to be about 1.3 Myr from a comparison of the Hertzsprung-Russell diagram (HRD) with stellar evolutionary models. The initial mass function (IMF) is derived from the HRD and the near-infrared (J, J −H) color-magnitude diagram. The slope of the IMF is about Γ = −1.6 ± 0.1, which is slightly steeper than that of the Salpeter/Kroupa IMF. It implies that low-mass star formation is dominant in the SFR. The sum of the masses of all the identified members provides the lower limit of the cluster mass (169M_⊙). We also analyzed the spectral energy distribution (SED) of pre-main sequence stars using the SED fitting tool of Robitaille et al., and confirm that there is a significant discrepancy between stellar mass and age obtained from two different methods based on the SED fitting tool and the HRD.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제17권1호
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• pp.7-14
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• 2011

This paper is intended to suggest some reference materials for future specialization of university education about healthcare facility design in Korea, by reviewing the degree systems and curriculum of 5 universities where architecture departments have specialized program for healthcare facility design in USA. Research method includes the navigation of related homepages, the e-mail contacts with the professors in charge, and the analysis of collected materials. Some conclusions can be summarized as following : Degrees of the specialized programs under concentration or track system are awarded as the same title as master program in the department of Architecture. Specialized education programs can be largely classified by concentration/track systems( Clemson University, University of Kansas and Arizona State University) which are operated independently in general and certificate system(Texas A&M University and Texas Tech University) which adds some healthcare related courses to general master program in the department of Architecture. As distinctive curriculum from 5 Universities, Clemson University which offers almost courses related to healthcare facility design, University of Kansas which provides internships(6 credits each) for summer term & fall semester of 2nd year, and Texas Tech University where certificate program is co-operated by architecture and nursing department can be mentioned. In order to pursuit the specialization of university education about healthcare facility design in the department of Architecture, it would be desirable to proceed it after setting the direction such as concentration, track or certificate system according to the various circumstances & conditions of the department concerned.

• 한국실내디자인학회논문집
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• 제21권6호
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• pp.271-279
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• 2012

Among the community-based cultural facilities, public libraries are places for social and educational purpose that improve the education of the resident, the expansion of the basic cultural education, communication between the members of society, and the accumulations and preservations of the culture. Public libraries should be a local cultural facility that expresses the value of a community. This study aims to analyze the design expression of publicness in a public branch library as a community-based cultural space through the study of branch library in the U.S. This study focused on the most future-oriented and innovative Ten New Landmark Libraries in the United States selected by Library Journal magazine in 2011. Among the selected libraries, three branch libraries which belongs Arizona Maricopa County were included in the study. The results of this study are as follows. First, the sites of the branch libraries vary geographically, but the libraries increase accessibility are caused by unique appearances and design concept of intellectual interest. Second, the floor plan shows the separation of meeting rooms and faculty space from the public space and has visual and spatial open space by high ceiling of the reading room. Third, multi-functional public space for residents are meeting rooms, the external patios for reading, galleries, cafes, libraries-shops which provides a variety of cultural programs, activities, and the opportunity to socialize neighbors. Fourth, branch Libraries have unique designs that harmonizes with nearby places to reflect locality, giving the locals a sense of pride in their community. Fifth, concrete brick and metal panel were used as finishing material for the practicality of maintenance. In particular, transparent glass envelope allows the locals to stay for long time due to openness and brightness of space.

• 경영과정보연구
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• 제31권3호
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• pp.21-46
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• 2012

최근 국내 기관 투자자들을 중심으로 전통적 투자대상으로부터의 수익이 하락추세에 있어 기관 투자자들이 적극적 자산운용을 기피할 경우, 장기적으로 안정적 수익보장을 유지하기 어렵다는 우려가 제기되었다. 이에 보유자산 구성을 조정한 수익성 개선전략의 요구가 증대되고 있으며, 일부 기관 투자자들은 헤지펀드를 기존 포트폴리오에 편입시킴으로써 운용수익률을 제고하려는 움직임을 보이고 있다. 본 연구에서는 시스템트레이딩을 이용하여 선물시장에서 거래확률 조정을 통한 헤지펀드 투자전략을 제시하고자 한다. 선물시장에서 사용되는 다양한 기술적 지표를 이용하여 연관성 규칙(association rule)을 생성하고 이를 거래규칙(trading rule)으로 전환하여 투자전략으로 활용한다. 한편 연관성 규칙은 기술적 지표의 개수와 개별 지표들의 구간값의 조합으로 생성되며, 조합에 따라 거래확률을 조정함으로써 위험관리가 가능한 투자전략을 수립하는데 사용된다. 제시된 전략의 우수성을 입증하기 위해 KOSPI 200 연결선물데이터를 이용하여 수익성 분석을 수행하였으며, 분석결과 제시된 투자전략이 투자위험관리에 효과적임을 보였다.