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배동식 ( Dongsik Bae ) 한국공간디자인학회 2015 한국공간디자인학회논문집 Vol.10 No.4
(Background and Purpose)The evolution of modern civilization has divided and specialized human society, and has causedloss of humanity by dividing space-time continuity of human. Moreover, due to the segmentation of preferences and functions within this diversified human society, fields related to creativity, such as music, art, and architecture, have also diversified and become more complex, with many types of form. Because of this diversification, there is a great deal of contrariety within modern architecture, with a lack of logical connectivity in space compositions, which can cause chaos. This study aims to present base data for a Space design plan. As one of the methods used to consider architecture spaces, we refer to the axis composition principle, which pertains to internal order, and analyze the methods and effects of differences in meaning revealed by the axis when unit spaces and combination spaces are used. (Method) This study aims to identify the methods used within, and effects of, space composition using an axis for the internal space, instead of applying this only to external space or using the architecture’s formative aspects based on visual perception theories. The process used is as follows: By considering perceptual psychological characteristics, which are significant as they are a standard part of human behavior, we arrange the balance and order characteristic of the visual perception. We then look at space limitations and order with reference to the perceptual characteristics of architecture spaces. We consider the concept of axes as the principle that creates order within space composition, and look at the expression characteristics of axes in terms of their basic elements or other composition principles. We also focus on the interrelation between the floor, wall, ceiling, pillars, and light within a unit of space as a step of architecture space, and identify the combinations of methods used for order formation within a space. We look at two composition methods using the axis approach, which include circle composition and conversion composition. We divide the effects of these compositions into three parts; that is, functional, symbolic, and psychological aspects, which are considered the basic goals of architecture. (Results) As a result of analyzing work based on the abovementioned standards, the effects of space composition by moving line impact the functional aspects, space efficiency, and unit space distribution when practicality is considered important. In terms of the symbolic aspect, it shows the main space creation that indicates space psychological effect by the scale, and as a means for user to get the target space, it has a focal point in internal space, preservation, permanency of the memory. With regard to the psychological aspect, psychological stability is provided when existing knowledge is used to predict the next space when moving into the target space. This facilitates movement into the target space in relation to the entrance area, visual objects located within the space, or light gravitation. (Conclusions) We expect this study to contribute to the formation of a systematic order for architecture spaces, and minimize issues by presenting a basic line on which to plan architectural spaces after clarifying the method and the effect of the way the space is composed on the axes.
Hagyoul Bae,Sungchul Kim,Minkyung Bae,Ja Sun Shin,Dongsik Kong,Hyunkwang Jung,Jaeman Jang,Jieun Lee,Dae Hwan Kim,Dong Myong Kim IEEE 2011 IEEE electron device letters Vol.32 No.6
<P>Considering asymmetry caused by layout, process, and device degradation, separate extraction of the source and drain resistances, i.e., <I>RS</I> and <I>RD</I>, respectively, from the total resistance <I>R</I><SUB>TOT</SUB> is very important in the design, modeling, and characterization of amorphous indium-gallium-zinc oxide (a-IGZO) thin-film transistors (TFTs). Due to the insulated gate structure, however, separate extraction is difficult through direct-current <I>I</I>-<I>V</I> characterization. In this letter, we propose a simple and useful technique for separate extraction of <I>RS</I> from <I>RD</I> in a-IGZO TFTs through a two-terminal parallel-mode <I>C</I> -<I>V</I> technique. We experimentally verified the validity of the proposed technique by comparing the result with the source-to-drain resistance from the <I>I</I>-<I>V</I> characteristics.</P>
Dongsik Kong,Hyun Kwang Jung,Yongsik Kim,Minkyung Bae,Jaeman Jang,Jaehyeong Kim,Woojoon Kim,Inseok Hur,김동명,김대환 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.21
The effect of the active layer thickness (T_(IGZO) ) on the negative bias illumanation stress (NBIS)-induced threshold voltage shift (VT ) in amorphous InGaZnO (a-IGZO) thin-film transistors (TFTs) is investigated and explained by using a subgap density-of-states model. The NBIS-induced VT in a-IGZO TFT with a thinner T_(IGZO) is negatively larger than that in a-IGZO TFTs with a thicker T_(IGZO) . The T_(IGZO) -dependent VT is found to be caused by either hole trapping into the gate insulator near the interface or oxygen vacancy (Vo) ionization, which is activated more by a larger surface electric field EIGZO as T_(IGZO) becomes thinner.
Dongsik Kong,Hyun-Kwang Jung,Yongsik Kim,Minkyung Bae,Yong Woo Jeon,Sungchul Kim,Dong Myong Kim,Dae Hwan Kim IEEE 2011 IEEE electron device letters Vol.32 No.10
<P>The effect of the active layer thickness (<I>T</I><SUB>IGZO</SUB>) on the negative bias stress (NBS)-induced threshold voltage shift (Δ<I>VT</I>) in amorphous InGaZnO (a-IGZO) thin-film transistors (TFTs) is investigated and explained by using a subgap density-of-states (DOS) model. The NBS-induced negative Δ<I>VT</I> in a-IGZO TFT with a thinner <I>T</I><SUB>IGZO</SUB> is larger than that with a thicker <I>T</I><SUB>IGZO</SUB>. Based on the simulation result with the subgap DOS model, it is concluded that the <I>T</I><SUB>IGZO</SUB>-dependent Δ<I>VT</I> is originated from the accelerated creation of shallow donor states due to a higher surface electric field in a-IGZO TFTs with a thinner <I>T</I><SUB>IGZO</SUB>.</P>
우동식(Dongsik Woo),배성현(Sunghyun Bae) 한국전기전자학회 2020 전기전자학회논문지 Vol.24 No.2
본 논문에서는 광대역 지향성 방사패턴을 가지는 자연에서 영감을 얻은 새싹 모양 안테나를 제안한다. 모션감지 센서 응용을 위해 넓은 빔폭을 가지는 새싹 모양의 기울어진 방사체를 설계하였다. 확장된 잘려진 접지면을 반사기로 작용하도록 하여 지향성 방사패턴을 가지도록 하였다. 평형 방사체를 급전하기 위하여 우수한 진폭 및 위상 평형도를 가지는 광대역 발룬을 활용하였다. 제안된 안테나는 8.5에서 14.5 GHz의 넓은 주파수 대역폭과 넓은 빔폭을 가졌으며, 방사 효율은 90% 정도이었다. 측정된 이득은 4에서 5dBi이며, 전후방비는 10~20dB이었다. 제안된 안테나는 광대역 넓은 빔폭과 지향성 방사패턴을 요구하는 이미징 센서, 위상 배열 시스템 및 레이더 등에 활용될 수 있음을 보였다. This paper presents a nature-inspired wideband sprout-leaf shaped antenna with end-fire radiation pattern. A sprout-leaf shape angled-radiator was designed for wide beamwidth radiation patterns for motion detection sensors. An extended and truncated ground plane was used as a reflector for end-fire radiation patterns. To feed the balanced radiator, a broadband microstrip (MS) to coplanar stripline (CPS) balun was utilized with excellent amplitude and phase balance. The proposed antenna demonstrates wide frequency bandwidth from 8.5 to 14.5 GHz with wide beamwidth and the radiation efficiency of 90%. The measured gain is from 4 to 5 dBi and front-to-back ratio was 10 to 20 dB. It has been shown that the proposed antenna can be used for imaging sensors, phased array systems, and radars that require a wide bandwidth and a directional radiation pattern.
Minkyung Bae,Yongsik Kim,Dongsik Kong,Hyun Kwang Jeong,Woojoon Kim,Jaehyeong Kim,Inseok Hur,Dong Myong Kim,Dae Hwan Kim IEEE 2011 IEEE electron device letters Vol.32 No.11
<P>Analytical drain current and gate capacitance models for amorphous InGaZnO (a-IGZO) thin-film transistors (TFTs) over sub- and above-threshold regions are proposed by adopting an effective carrier density for the dominant carrier density. The effective carrier density fully considers the free carriers in the conduction band, the localized subgap deep states, and tail states over the bandgap for analytical <I>I</I>-<I>V</I> and <I>C</I>-<I>V</I> characteristics. The proposed analytical models are verified by comparing the measured <I>I</I>-<I>V</I> and <I>C</I>-<I>V</I> characteristics. The proposed models make a time-efficient simulation of a-IGZO TFT-based circuits possible due to their analytical form.</P>
배재옥(Jaeok Bae),최민수(Minsu Choi),서현욱(Hyunuk Suh),한동식(Dongsik Han),전충환(Chunghwan Jeon) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.11
This paper describes the numerical results of combustion and emission characteristics in gasoline with hydrogen on various equivalent ratio and rate of hydrogen addition by AVL-FIRE. GDI(Gasolin Direct Injection) which is a kind of gasoline combustion has a advantage to achieve high performance and fuel-efficiency by accurate control of combustion through direct injection of gasoline in a cylinder, but produce large amount of Soot. In this study, we try to solve the problem by adding hydrogen. We made the initial gas composition of CVCC(Constant Volume Combustion Chamber) to homogeneous mixture of air and hydrogen(24%, 48%) and let equivalence ratio to three conditions(0.5, 0.8, 1.0). The numerical results indicate that there is a ID(Ignition Delay) and reduction of exhaust emission including Soot according to a increase of hydrogen addition. Especially, COx and NOx emission are reduced by decreasing initial amount of gasoline and air in CVCC.