• 한국재료학회지
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• 제17권9호
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• pp.453-457
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• 2007

Interest in use of ink-jet printing for pattern-on-demand fabrication of metal interconnects without complicated and wasteful etching process has been on rapid increase. However, ink-jet printing is a wet process and needs an additional thermal treatment such as an annealing process. Since a metal ink is a suspension containing metal nanoparticles and organic capping molecules to prevent aggregation of them, the microstructure of an ink-jet printed metal interconnect 'as dried' can be characterized as a stack of loosely packed nanoparticles. Therefore, during being treated thermally, an inkjet-printed interconnect is likely to evolve a characteristic microstructure, different from that of the conventionally vacuum-deposited metal films. Microstructure characteristics can significantly affect the corresponding electrical and mechanical properties. The characteristics of change in microstructure and electrical resistivity of inkjet-printed silver (Ag) films when annealed isothermally at a temperature between 170 and $240^{\circ}C$ were analyzed. The change in electrical resistivity was described using the first-order exponential decay kinetics. The corresponding activation energy of 0.44 eV was explained in terms of a thermally-activated mechanism, i.e., migration of point defects such as vacancy-oxygen pairs, rather than microstructure evolution such as grain growth or change in porosity.

• 한국융합학회논문지
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• 제12권9호
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• pp.93-98
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• 2021

프로그래밍 언어 학습 경험이 학습 동기에 미치는 변화를 분석하였다. 프로그래밍 언어 학습은 전공생에게도 어려운 과정으로 평가되는 것이 일반적이다. 비전공자에게로 확대되고 있는 현 시점에서 프로그래밍 학습과 관련된 심리적 태도 변화를 측정하는 것은 학습자 분석에 필요하다. 동기 관련 구인요인인 성취목표, 학업적 흥미, 학업적 자기효능감, 인지적 관여, 학업적 자기조절을 측정하여 전반적인 학습자 태도 변화를 알아보았다. 측정 결과 학습 태도 관련 모든 요인에서 사후 검사 값이 감소한 것으로 나타났다. 이 결과는 학습과정의 난이도가 프로그래밍 학습 의욕을 감소시킨 것으로 해석된다. 학습자가 인지하는 난이도가 클 수록 학습의욕이 더 크게 감소하는 것으로 나타났다. 이런 연구결과를 바탕으로 학습자가 느끼는 학습 난이도의 정도를 낮출 수 있는 상황과 피드백을 줄 수 있는 체계적인 학습환경과 학습과정의 중요성을 시사점으로 제시하고자 한다.

• 산업기술연구
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• 제28권A호
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• pp.97-104
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• 2008

Recently, interests on positioning system for location-based services have been significantly increased. Many indoor environment systems using fingerprint scheme have been designed to take more accuracy of positioning, but they are inefficient in adapting to change of environments. In this paper, we focus on a client-based positioning system over WLAN for decreasing installation cost and adapting to change of environments. In the proposed system, APs with stable RSSI are selected as base APs independently for each reference point. Experimental results show that proposed system expands service area approximately 20% much than traditional systems using K-NN algorithm and needs only 20% modification process to fingerprint data compare with traditional systems whenever environment conditions are changed.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제20권4호
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• pp.91-100
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• 2014

Purpose : The purpose of this paper is to analyze the characteristics of hospital architecture constructed in each periods and identify the changing process of hospital architecture in Korea since 1945. Methods : Literature review was conducted while the data of hospitals had been collected and the subject of investigation were selected. The important point of analysis is about design conception, site plan, block plan and hospital form. Results : The characteristics of hospital architecture are identified in each periods. Developed by private sector, hospitals have enlarged their beds and sizes under the competitive environments. In terms of size and external shape, vertical form has become a dominant scene of hospital forms in Korea. Among the dominance of tower-on podium, various block plans have been adopted with hospital streets. Also a few cases of horizontal disintegrated form was introduced. Implications : This paper could be the basic data to organize the history of Korean Hospital Architecture, and insufficient data should be supplemented continuously.

• Bulletin of the Korean Chemical Society
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• 제35권6호
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• pp.1754-1758
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• 2014

The nucleophilic substitution reactions of bis(Y-aryl) chlorothiophosphates (1) with X-pyridines are investigated kinetically in acetonitrile at $35.0^{\circ}C$. The free energy relationships with both X and Y are biphasic concave upwards with a break point at X = 3-Ph and Y = H, respectively. The sign of cross-interaction constants (CICs; ${\rho}_{XY}$) is positive with all X and Y. Proposed mechanism is a stepwise process with a rate-limiting leaving group departure from the intermediate with all X and Y. The kinetic results of 1 are compared with those of Y-aryl phenyl chlorothiophosphates (2). In the case of Y = electron-withdrawing groups, the cross-interaction between Y and Y, due to additional substituent Y, is significant enough to change the sign of ${\rho}_{XY}$ from negative with 2 to positive with 1, indicative of the change of mechanism from a rate-limiting bond formation to bond breaking.

• 대한기계학회논문집B
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• 제21권4호
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• pp.503-508
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• 1997

The change of the structure of homogeneous turbulence subject to irrotational strains has been studied in an anti-Morel type diffuser (center matched cubic contour) using the hot wire anemometry. It was observed that the profiles of mean velocities and turbulence velocities along the center line were stable at the entrance region but rapidly changed near the matching point. The wall induced turbulence at the entrance region grows fast and was diffused toward the center at downstream. It was also observed that the axial turbulence grows faster than the radial one in the middle region of the diffusing flow and that the diffusing process has the vortex compression mechanism due to the conservation of angular momentum. These phenomena are frequently observed at the initial flow region of the free jet.

• 한국CDE학회논문집
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• 제12권4호
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• pp.245-254
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• 2007

This research proposed feature extraction algorithms as an input of STEP Ap214 data, and feature parameterization process to simplify further design change and maintenance. The procedure starts with suppression of blend faces of an input solid model to generate its simplified model, where both constant and variable-radius blends are considered. Most existing cell decomposition algorithms utilize concave edges, and they usually require complex procedures and computing time in recomposing the cells. The proposed algorithm using reference features, however, was found to be more efficient through testing with a few sample cases. In addition, the algorithm is able to recognize depression features, which is another strong point compared to the existing cell decomposition approaches. The proposed algorithm was implemented on a commercial CAD system and tested with selected industrial product models, along with parameterization of recognized features for further design change.

• 대한건축학회논문집:계획계
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• 제34권5호
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• pp.89-96
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• 2018

Ami-dong Crematorium in Busan was established as one of the public facilities in 1929(the period of Japanese Occupation). It is the originator of Busan Yeongnak-Park(永樂公園), the funeral facilities of Busan municipality. The crematorium of Busan region was accepted at an earlier stage inside Japanese Concession in accordance with the opening a port. As Ami-dong Crematorium was constructed as a public facilities, the precedent has been maintained so far, providing a background equipped with the leading public corporation facilities in Busan area. This study was based on the expansion construction document founded by National Archives in Korea. Above all things, this research revealed the establishment and change of Busan Ami-dong Crematorium as the historical point for the formation process of recent public funeral facilities.

• 전자공학회논문지S
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• 제36S권8호
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• pp.55-64
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• 1999

본 논문에서는 가변하는 다중 닻점을 이용하는 새로운 색역 사상 방법을 제안한다. 제안된 방법은 기존의 한 개의 닻점을 사용하는 색역 사상에서 발생하는 휘도 범위의 축소를 가변하는 닻점을 이용하여 보상하여준다. 또한 이 과정에서 연속 계조 칼라를 재현하기 위하여 색역을 여러 영역으로 구분하여 각각의 영역에서 다른 닻점을 사용하는 다중 닻점 방식을 제안한다. 따라서 본 논문에서는 저가의 칼라 출력장치에서 고화질의 칼라를 재현할 수 있게 한다.

• 한국문헌정보학회지
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• 제30권3호
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• pp.85-108
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• 1996

본 논문은 목록규칙에 있어서의 목록의 접근점인 표목의 변천과정에 대하여 고찰하였으며, 한국목록규칙과 영미계목록규칙에 나타난 표목부의 변천, 온라인 환경에서의 접근점과 미래 목록규칙에 대하여 연구하였다. 기본표목의 개념이 다양함에도 불구하고 오늘날 온라인 환경에서 기본표목의 개념이 상실되어 가고 있는데 한국목록규칙, 영미목록규칙 제21장, MARC포맷 그리고 KORMARC포맷의 표목부가 목록환경의 변화에 맞도록 개정되어야 할 필요가 있다. 이러한 목록규칙의 개정은 하이퍼텍스트와 하이퍼미디어에 근거한 계속적인 실질적 연구가 필요하고 미래 목록규칙에 통합되어야 할 것이다.