In_xGa_1-xN/GaN 다중양자우물 구조의 광학적 성질 연구

김기홍,김인수,박헌보,배인호,유재인,장윤석,Kim, Ki-Hong,Kim, In-Su,Park, Hun-Bo,Bae, In-Ho,Yu, jae-In,Jang, Yoon-Seok 한국진공학회 2009 Applied Science and Convergence Technology Vol.18 No.1

$In_xGa_{1-x}N$/GaN 다중양자우물 구조의 EL 특성을 온도와 주입전류 변화에 따른 특성을 조사하였다 저전류와 고전류 주입시 EL 효율의 온도 의존 변화는 매우 다르게 나타나는데, 이러한 온도와 전류의 변화에 의한 독특한 EL 효율의 변화는 내부전기장의 존재 하에 순방향 바이어스에 기인한 외부전기장의 영향인 것으로 볼 수 있다. 그리고 $In_xGa_{1-x}N$/GaN 다중양자우물 구조에서 In 성비의 증가는 발광파장위치의 적색이동을 보였다. 15K에서 주입 전류의 증가에 따라 녹색 양자우물 구조는 80 meV와 청색 양자우물 구조는 22 meV의 청색 편이를 하였다. 이는 전류의 증가에 의해 단위 시간당 생성되는 캐리어 수가증가하게 되고 그에 따라 subband가 급격히 채워지는 band filling 현상이 일어나게 되어 짧은 파장에서 재결합이 증가하기 때문이다. 그리고 청색과 녹색 다중 양자우물구조의 짧은 파장 쪽으로의 편이 차이는 In 농도에 기인한 것으로 In 농도가 높으면 양자우물 깊이가 증가되어 더 강한 양자속박효과가 작용하여 캐리어 구속력이 증가하기 때문 것으로 볼 수 있다. Temperature and injection current dependence of electroluminescence(EL) spectral intensity of the $In_xGa_{1-x}N$/GaN multi-quantum wells(MQW) have been studied over a wide temperature range and as a function of injection current level. It is found that a temperature-dependent variation pattern of the EL efficiency under very low and high injection currents shows a drastic difference. This unique EL efficiency variation pattern with temperature and current can be explained field effects due to the driving forward bias in presence of internal(piezo and spontaneous polarization) fields. Increase of the indium content in $In_xGa_{1-x}N$/GaN multiple quantum wells gives rise to a redshift of 80 meV and 22 meV for green and blue MQW, respectively. It can be explained by carrier localization by potential fluctuation of multiple quantum well and MQW structures also shows a keen difference owing to the different indium content in InGaN/GaN MQW.

Electro-Mechanical Brake의 제동 압력 제어

김인수(In Su Kim),김만호(Man Ho Kim),이석(Suk Lee),이경창(Kyung Chang Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

In order to implement various intelligent functions and to reduce weight and required space, automobile industry now apply by-wire technology to many critical subsystems of a car. One of these attempts is brake-by-wire system where the traditional hydraulic mechanism is replaced by electro-mechanical brake(EMB) and in-vehicle network. Especially in case of brake-by-wire system, simplicity and efficiency are important factor. This paper presents an comparison between lead screw and ball screw and error squared PI controller.

아황산금나트륨염을 이용한 Au 범프용 금도금층의 표면형상 및 우선적 결정 성장방향

김인수,양성훈,박종완,Kim, In-Su,Yang, Seong-Hun,Park, Jong-Wan 한국재료학회 1995 한국재료학회지 Vol.5 No.6

아황산금나트륨염을 이용하여 형성된 약 20$\mu\textrm{m}$ 금도금층의 표면형상 및 우선적 결정 성장 방향에 대하여 전류밀도, 온도, 농도, pH, 교만속도, 금이온농도가 미치는 영향에 대하여 연구하였다. 표면형상은 cathode 근처의 금이온농도가 증가하는 조건[전류밀도(13.0mA/$\textrm{cm}^2$2$\longrightarrow$4.6mA/$\textrm{cm}^2$)], 온도 (3$0^{\circ}C$$\longrightarrow$6$0^{\circ}C$), pH(12.0$\longrightarrow$9.0), 교반효과(Orpm$\longrightarrow$3200rpm), 금이온농도(10g /1$\longrightarrow$l4g/1)으로 갈수록 porous한 조직에서 미세한 조직으로의 변화가 관찰되었다. X선분석에 의하면 금도금층의 결정성장의 주방향은 표면형상과 밀접한 관계를 나타내었으며 표면형상이 미세화되는 조건인 전류밀도(13.0$\longrightarrow$14.6mA/$\textrm{cm}^2$), pH(12.0$\longrightarrow$9.0)는 감소 할수록, 온도(3$0^{\circ}C$$\longrightarrow$6$0^{\circ}C$), 교반속도(0rPm$\longrightarrow$3200rpm), 금이온농도(10g/1$\longrightarrow$g/1)]는 증가 할수록 결정성장의 주회절피크는 (111)에서 (220)으로 그 성장면이 변하고 있음이 조사되었다. Surface morphology and preferred orientation of 20${\mu}{\textrm}{m}$ gold electrodeposit formed from aqueous solution of the sodium gold sulfite were studied in terms of current density, plating temperature and Au concentration. As the current density changed from 13.0mA/$\textrm{cm}^2$ to 4.6mA/$\textrm{cm}^2$, the solution temperature from 3$0^{\circ}C$ to 6$0^{\circ}C$, pH from 12.0 to 9.0, agitation speed from 0 rpm to 3200rpm and Au concentration from 10g/1 to 14 g/1, local Au concentration near the cathodic surface increased. With increasing the Au concentration, the surface morphology chanced from porous structure to fine-grained structure. Furthermore, it was observed that the preferred orentation of the Au layer changed from (111) to (220) upon the same variation In the Au concentration. The surface morphology and the preferred orientation of the Au layer were found to be closely related to each other.

Brake-By-Wire 시스템을 위한 Electro-Mechanical Brake(EMB) 설계

김인수(In-Su Kim),홍순명(Soon-Myoung Hong),백경훈(Kyoung-Hoon Baek),김만호(Man-Ho Kim),이동헌(Dong-Hun Lee),이경창(Kyoung-Chang Lee),이석(Suk Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2

In order to implement various intelligent functions and to reduce weight and required space. automobile industry now begins to introduce by-wire technology to many critical subsystems of a car. One of these attempts is brake-by-wire system where the traditional hydraulic mechanism is replaced by electro-mechanical brake(EMB) and in-vehicle network. This paper presents an EMB design for low-speed electric vehicle such as golf cart. It employs an electric motor and an electric magnet along with CAN modules and network to carry braking signals.

정보구조 설계를 위한 계층적 탐색모델 개발 및 적용

김인수,김봉건,최재현,Kim, In-Su,Kim, Bong-Geon,Choe, Jae-Hyeon 대한인간공학회 2004 大韓人間工學會誌 Vol.23 No.3

This study was contrived Hierarchical Information Search (HIS) model. HIS model is based on a “cognitive process” in which model, comprising basic human information processing mechanize and information interaction. Its process include 3 semantic cognitive processes: Schema-Association LTM, Form Domain, and Alternative Selection. Design methodology consists to elicitate memory, thinking and cognitive response variables. In case study, menu structure of mobile phone was applied. In result, a correlation between predictive error rate and real error rate was .892. and a correlation between selective and real reaction time was .697. This present to suggest a model of how the methodology could be applied to real system design effectively when this was used. HIS model could become one of the most important factors for success of product design. In the perspective, the systemic methodology would contribute to design a quantitative and predictive system.

소프트웨어 비용추정 모형에 관한 소고

김인수,이대기,Kim, In-Su,Lee, Dae-Gi 한국전자통신연구원 1987 전자통신 Vol.9 No.3

The problems in software cost management are well known. Cost estimates are too low. Software development projects frequently have cost overruns, which are due to poor estimates. A fair amount of work have been done toward developing cost estimation models. These models vary in their outputs (e. g., total cost, manning schedule) and in the factors used to calculate their estimates. They also vary with regard to the type of formula, parameters, use of previous data, and staffing considerations. This paper will distinguish them by the type of formula they use to calculate total effort and staffing level, and will discuss enough models to demonstrate the characteristics of each model category.

황련해독탕 추출액의 각막염 원인균에 대한 항균효과

김인수,서진종,김광곤,하동룡,신민구,김의수,전상윤,Kim, In-Soo,Seo, Jin-Jong,Kim, Kwang-Gon,Ha, Dong-Ryong,Shin, Min-Koo,Kim, Eui-Su,Jeon, Sang-Yun 대한한방내과학회 2014 大韓韓方內科學會誌 Vol.35 No.3

Objectives: The goal of this project was to measure the antibacterial effectiveness of Hwangryunhaedok-tang (barberry root decoction for detoxification) and its constituents. All of the active ingredients including the final product were prepared using high-pressure sterilization for use as medicinal eye drops. The varying forms of Hwangryunhaedok-tang (barberry root decoction for detoxification) were used to treat Staphylococcus epidermidis and Enterococcus faecalis which are found in keratitis. Methods: The antibacterial effect was measured by observing the presence or absence of antimicrobial activity when treated with varying concentrations of Hwangryunhaedok-tang extract. The tests were performed using a dosage of $70{\mu}l$ dosages of 100%, 50%, 10% and 1% the extracted solution by the minimum growth inhibitory concentration measurement. Antimicrobial activity was measured by examining the correlation between dosage strength and bacterial activity from $70{\mu}l$ to $10{\mu}l$ at the same concentration. Results: 1. Hwangryunhaedok-tang (barberry root decoction for detoxification), Phellodendri Cortex, and gardenia didn't show any antimicrobial effects against S. aureus, S. epidermidis, or E. faecalis. 2. Barberry root showed antimicrobial effects against S. aureus and S. epidermidis depending on the levels of concentration but didn't show any antimicrobial effects against E. faecalis. 3. Skullcap showed antimicrobial effects against S. aureus and S. epidermidis when a dosage of 100% extract $70{\mu}l$ was used. However, did not show any antimicrobial effects at all against E. faecalis. Conclusions: Hwangryunhaedok-tang (barberry root decoction for detoxification) and its constituents such as barberry root, phellodendri cortex, skullcap, and gardenia, can be used as an alternative to antibiotic medicinal eye drops to treat keratitis. However, further research on effective uses of and efficient extraction methods are needed.

IN738LC 합금의 열간 노출 및 재생 열처리에 따른 미세조직과 응력 파단 특성의 변화

최백규,주동원,김인수,장중철,조창용,Choe, Baek-Gyu,Ju, Dong-Won,Kim, In-Su,Jang, Jung-Cheol,Jo, Chang-Yong 한국재료학회 2001 한국재료학회지 Vol.11 No.11

Effects of thermal exposure and rejuvenation treatment on the microstructural evolution and the stress-rupture properties of IN738LC have been investigated. The role of precipitates on the stress-rupture properties has been analyzed through microstructural observations. Thermal exposure at $982^{\circ}C$ for 1000 hours gave rise to precipitation of $\sigma$ phase and coarsening of r'. The microstructural degradation with thermal exposure at $982^{\circ}C$ deteriorated stress rupture properties of the alloy. All the existing phases except MC carbides have completely dissolved into the matrix with homogenization treatment at $1200^{\circ}C$ for 2 hours. Microstructure and stress-rupture properties of the thermal exposed specimens have been successfully rejuvenated by the proposed treatment.

교수설계요소로서 환상(Fantasy)의 구성요소와 구현원리에 대한 연구

김인수 ( In Su Kim ) 한국교육정보미디어학회 2009 교육정보미디어연구 Vol.15 No.4

환상은 인간의 의식을 그 물리적 존재에 한정하지 않고 현실세계를 초월한 곳으로 확대시켜 주는 특성을 가지며 이러한 특성 때문에 고대로부터 현대에 이르기까지 인간의 문화적 생활과 불가분의 관계를 가져왔다. 특히 현대에 와서는 공학적 발달을 배경으로 문학이나 영상 등 환상적 요소를 담은 문화상품들이 전 세계적으로 성공을 거두고 있고 또 그 잠재가능성이 특정 분야에 한정되지 않는 것으로 인식됨에 따라 다양한 분야에서 환상에 대한 관심이 그 어느 때 보다 고조되고 있다. 이러한 추세는 교육 분야도 예외가 아니다. 환상적 요소는 교육에 흥미와 역동성을 제공함으로써 학습효과를 증진시키는 것으로 평가되어 교육환경의 구성, 학습교재의 제작 등 교육실천의 분야에서 환상과 환상성을 활용한 구체적 사례들을 생성해 내고 있고 또 큰 성공을 거두는 경우도 빈발하고 있다. 그러나 교육의 실천적 영역에서 활발히 사용되고 있음에도 불구하고 환상에 대한 연구는 상대적으로 활발하지 않으며, 특히 교육적 상황에서 활용하고자 할 때 적용할 수 있는 처방적 원리는 찾아보기 어렵다. 본 연구의 목적은 지식과 환상을 결합시켜 교육 콘텐츠를 설계하고자 할 때 활용할 수 있는 환상의 구성요소와 구현의 원리를 탐구하는 것이다. 본 연구는 연구목적을 달성하기 위해 여러 분야에서 제시하는 환상에 대한 논의를 고찰하고 환상적 요소를 위주로 교육 콘텐츠를 설계하는 전문가 7인을 대상으로 심층면담을 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 환상의 구성요소는 시각적 요소, 통찰적 요소, 심리적 요소로 범주화되었다. 이 세 가지 범주는 환상적 시공간, 환상적 존재, 발생적 통찰, 가치적 통찰, 새로움, 친근감의 여섯 가지 하위 요소를 포함한다. 둘째, 환상의 구현원리는 왜곡적 재현, 구체적 재현, 실제적 재현, 조합적 재현의 넷으로 범주화하여 제시되었다. 이는 존재의 왜곡, 시공간의 왜곡, 소재의 왜곡, 추상적 개념의 공간화, 추상적 개념의 존재화, 체험적 실제, 묘사적 실제, 은닉성, 이야기성, 정합성 등 열 가지 구현원리를 그 내용으로 한다. The purpose of this study is to explorer what factors and principles that fantasy applies to the educational context. For this purpose, in-depth interview was conducted. In conclusion, firstly, this study identified six factors(fantastic space/time, fantastic being, insight into origin, insight into value, novelty, affinity) with three categories. Secondly, this study explored ten principles (distortion of being, distortion of time and space, distortion of material, embodiment of an abstract idea to fantastic space, embodiment of an abstract idea to fantastic being, physical experience of fantastic events, descriptive experience of fantastic events, concealment of learning purposes, storytelling, harmony with learning material and fantasy setting) with four categories. Based on the above, the study suggest three considerations for applying these principles to the educational content design. Specifically this study is likely to contribute by adding practical knowledge of educational factors that fantasy offers, and the way to represent them into educational application such as designing and developing educational contents.

노화과정(老化過程)의 흰쥐에서 보폐산(補肺散)이 폐(肺)의 대사효소계(代謝酵素系)에 미치는 영향(影響)

김인수,고광찬,오민석,송태원,Kim, In-su,Go, Gwang-Chan,Oh, Min-suk,Song, Tae-won 대전대학교 한의학연구소 1999 한의학연구소 논문집 Vol.8 No.1

Through observing effect of BOPEASAN(BPT) on an aging white rat's metabolic enzyme system, the following conclusions were addressed 1. The quantity of the lipid peroxide in lung of was decreased meaningfully in all of experimental subject groups, relatively to counterpart groups. 2. Cytochrome P-450, Cytochrome b5, NADPH-Cytochrome P45, was decreased meaningfully in the experimental subject groups B,C and D. 3. superoxide dismutase, catarase, grutathione peroxidase, was increased meaningfully in the experimental subject groups B.C and D. 4. glutathione, glutathione S-transferase, glutathione redutase, ${\gamma}$-Glutamylcytein synthetase, had no meaningful change in the experimental subject groups. Regarding the above conclusions, the Bopeasan was affecting positively on both lipid peroxide a nd the enzyme system, as well as it has efficacy of suppressing the phenomena of aging, Therefore, the Bopeasan is, hereafter, expected to be applied clinically.