적외선 센서를 위한 이방성 식각 기술

천인호,조남인 선문대학교·중소기업기술지원연구소 1998 선문공대 연구/기술 논문집 Vol.3 No.1

적외선 센서 제작을 위한 이방성 식각 기술을 조사하였다 단결정 실리콘 기판에 이방성 식각을 하기 위해서 KOH와 TMAH의 서로 다른 두 가지 식각액을 사용하였다. KOH용액은 TMAH용액과 비교하여 녹은 식각율을 보이지만 실리콘 산화막과의 Selectivity는 떨어진다 결론적으로 TMAH는 멤브레인층의 형성과 적외선 흡수체 구조를 만드는데 적당만 용액이다 We report on anisotropic etching technologies for the fabrication Infrared sensors Two different etching solutions were used for the anisotropic etching for single crystal silicon substrates - KOH (potassum hγdroxlde) and TMAH (tetra methγ1 ammonium hγdroxide) KOH presented the higher etching rates compared to TMAH, but has poor selectivity with silicon dioxide It is concluded that TMAH is more suitable solution for the formation of membrane layer on which infrared absorbing strurtures are constructed

INTEL 8086 CPU를 이용한 시분할 버스 구조의 멀티프로세서 시스템의 모델링 및 설계

이남재,김영천,장옥배 全北大學校 基礎科學硏究所 1991 基礎科學 Vol.14 No.2

In this paper, TEP Jus is proposed for implementation of Intel 8086-based multiprocessor system on a timeshared bus. The DPMC and the arbiter are designed that the local memory of each PE can accept memory request both from a local processor and from the system bus. Dynamic priority scheme is selected for the arbitration algorithm of system bus arbiter. The proposed system bus is modeled by Petri-net for simulation.

인터넷을 통한 연구센터 데이터베이스 시스템 구축

황의천,김일남,김남호,이봉형,왕수현 강원대학교 석재복합신소재제품연구센터 1997 석재연 논문집 Vol.2 No.-

본 연구의 목적은 석재복합 신소재제품 연구센터의 데이터베이스를 인터넷상에서 구축하여 이 데이터베이스가 연구활동 및 산업지원활동을 지원하도록 하는데 있다. 연구센터와 관련된 데이터베이스를 인터넷상의 세계정보망(world-wide web)이 연계 및 등록시켜 적극적으로 연구소의 활동을 홍보함과 동시에 세계정보망을 통한 각국의 다소 산업체의 산업정보를 실시간(real time)에 검색할 수 있는 정보망을 구축할 것이다. 석재복합 신소재제품 연구센터의 연구활동, 연구결과와 관련 산업체의 활동들을 데이터베이스화한 뒤, 이를 인터넷상에 제공함으로써 연구소의 연구활동 및 관련산업체들의 활동을 국제적으로 홍보하며 각국의 수요와 온라인으로 상담 및 전자우편을 나눌 수 있으므로 해서 지역경제의 국제화를 맞을 것으로 기대된다. 또한 앞으로 있을 정보고속도로의 구축과 활용을 위하여 본 연구는 기여하게 될 것이다. The purpose of this study is to construct the database of RRC research center on internet to support the research activities and industrial activities. Registering the database on internet, the center will proactively advertise the local industrial activities and will construct the information network which will enable the real-time search for industrial information. The database will include RRC's research activities, research output, and related industrial's activities. The homepage will advertise the RRC's activities worldwidely, support the online business, provide the e-mail, and it will enable the research center to be the leader of internationalization of local economy. The study will also contribute to further study of information highway.

2레벨 멀티캐쉬 콘트롤러의 설계에 관한 연구

李南宰,姜寅坤,金永川 全北大學校 1993 論文集 Vol.36 No.-

In this paper. Two level multi-cache controller is designed for multiprocessor system with a time shared bus. In order to design two level multi-cache controller, we develope two level cache coherency protocol based on Illinoise protocol which uses the write invalidation method with system bus snooping capability. Our controller is designed by bottom-up method using VHDL. It consists of 18 finite state machines which are described by behavioral model of VHDL. And, 6 functional blocks are constructed using 18 finite state machines. These blocks are integrated as the two level multi-cache controller. The controller is varified by logic simulation using test vector which describes the various behavior of processor and system bus.

Passive 스타 구조를 갖는 고속 광 ATM 망에서의 채널 할당 알고리즘

이남재,강인곤,이팔진,金永川 全北大學校 1994 論文集 Vol.38 No.-

In single hop lightwave networks, the system performance using ALOHA-based protocols depends on the number of minislots in a data transmission frame. But, in the case of adopting this protocol to ATM, the multi-control channels are required in order to improve the system performance because the size of cell is fixed and short. In this paper, we propose a dynamic channel allocation algorithm with two-control channels. This algorithm dynamically alloctes channel for prioritized traffic in high-speed optical ATM networks. In order to evalute the performance of proposed algorithm, we simulate in terms of per channel throughput, cell loss rate. and cell delay with variations in offered load.

광발아성을 갖는 잡초성 벼의 발견

백남천 서울대학교 농업개발연구소 1999 농업생명과학연구 Vol.3 No.-

Photoregulation of seed germination is the important character of plant species producing small seeds such as lettuce, tobacco, Arabidopsis, and Gramineae weeds, etc. It has been known that there is no photoblastism in rice seeds. Here we present at first that a photoblastic rice (PBR) seed was discovered among Korean weedy rice lines. The PBR seed identified among the 235 weedy rice lines germinated about 99% under white light and 0.3% in total darkness. When the PBR seeds were planted, it showed the variation of emergency rate according to the burial depth and temperature. In the 18/12℃ (day/night) diurnal condition, the emergency rate was 39% at 1 cm burial depth, 15% at 3~5cm, 5% at 7cm, and 1% at 10 cm. The deeper the seeds were planted, the lower the emergency showed. Under 24/22℃ condition, the emergency rate at 1 cm burial depth was only 6%. When the PBR seeds were stored at room temperature after harvest, seed dormancy and photoblastism were gradually decayed. The seed dormancy disappeared more than 90% after 3-month storage. Photoblastism disappeared 26% after 16 months and 63% after 28 months. The seed dormancy of the PBR was broken by high temperature(50℃ for 7days) to dry seeds and, however, the photoblastism was not influenced and still maintained. In the amount of light and imbibition time, the more the seeds were irradiated, the higher germination rate was. The more imbibition time before light was, the more germination was delayed. In the response of light quality, the germination rate of the PBR seeds was promoted by red light and inhibited by far-red light, indicating that the seed germination was controlled by phytochromes. It also showed photoreversibility. The seed germination of PBR was alternately promoted or inhibited by the final irradiation of red or far-red light.

Barley yellow dwarf virus의 분자학적 동정 및 밀에서의 저항성 유전자원 탐색

백남천 서울대학교 농업개발연구소 2000 농업생명과학연구 Vol.4 No.-

Barley Yellow Dwarf Virus (BYDV), an aphid-borne luteovirus, is a major plant pathogenic disease causing a huge economic loss in the grain production of a wide range of Gramineae species throughout the world. It has been recently reported that BYDV also occurred frequently in wheat field in Korea. We performed to develop the detection and classification methods of BYDV strains that were accomplished by reverse transcription-polymerase chain reaction (RT-PCR), to investigate the regional distributions of BYDV strains in Korea, and to identify the resistant cultivars or lines of wheat to the predominant BYDV strains, providing basic information for the breeding of BYDV-resistant wheat varieties. Since there are high variations among BYDV strains, three pairs of primers were designed to detect BYDV strains such as PAV(Vic-PAV and CN-PAV) and MAV (primer A) simultaneously, specifically Vic-PAV (primer B), and MAV (primer C) based on the genomic RNA sequences of BYDV strains reported previously. The validity of the primers was confirmed using several BYDV strains obtained from CIMMYT. Though three BYDV strains were able to be detected using primer A, PCR products were not distinguished between two PAV strains. It was possible to separate them with a restriction enzyme, EcoRI, whose restriction site was present in the amplified DNA fragment from Vic-PAV, but not from CN-PAV. Using these methods, the regional distribution of BYDV strains in Korea from 1999 to 2000 showed that PAV strain was mainly detected about 65% (Vic-PAV 52.6%; CN-PAV 47.4%) and MAV strain about 3%. Using ELISA test for the examination of BYDV resistance with 17 cultivars and 4 lines among Korean wheat, three cultivars, Gurumil, Topdongmil, and Olgurumil, were susceptible to BYDV and the others were resistant. In plant growth and yield component responses to BYDV infection, Gurumil showed significant difference between the uninfected and the infected, suggesting the most susceptible to BYDV among Korean wheat, but Eunpamil and Seohae118 did no difference, an indication that they have the highest resistance.

Anisotropic etching characteristics of single crystal silicon by KOH and KOH-IPA Solutions

조남인,천인호 韓國眞空學會 2002 Applied Science and Convergence Technology Vol.11 No.4

이방성 습식 식각기술을 이용하여 멤버레인을 제작하기 위하여 KOH 용액 및 KOH-IPA 혼합용액을 사용하여 단결정 실리콘 기판을 식각하였다. 단결정 실리콘의 식각속도는 식각 용액의 온도와 농도에 좌우되었으며, 식각 용액의 농도에 따라 식각 형태와 패턴 형성 방향이 달라짐도 관찰되었다. 식각을 위한 표면패턴은 실리콘웨이퍼의 primary flat에 45°로 기울여 형성되었으며 KOH 의 농도가 20 wt%로 유지되었을 때, 식각 용액의 온도 80℃이상에서는 U-groove, 80℃ 이하의 온도에서는 V-groove 식각 형태가 형성되었다. 각 면에 대한 식각속도 차이에 의해서 생기는 hillock은 온도와 농도가 높아짐에 따라 현저하게 줄어들었다. For a formation of membrane structures, single crystal silicon wafers have been anisotropically etched with solutions of KOH and KOH-IPA. The etching rate was observed to-be strongly dependent upon tie etchant temperature and concentration. Mask patterns for the etching experiment was aligned to incline 45 on the primary flat of the silicon wafer. The different etching characteristics were observed according to pattern directions and etchant concentration. When the KOH concentration was fixed to 20 wt%, the U-groove etching shape was observed for the etching temperature of above 80℃, and V-groove shapes observed at below 80℃. Hillocks, which were generated at the etched silicon surfaces, has been deceased as the increasing of the etchant temperature and concentration.

전기분해에 의한 병원폐수의 처리에 관한 연구

채수권,김남천 서울보건대학 1996 서울보건대학 부설 병원경영연구소 논문집 Vol.2 No.1

The study on treatment of hospital wastewater was investigated by the electrolytic treatment method using Ti/Pt-PbO electrodes. The batch experimental results were assessed in terms of COD, SS, Br^(-) and F- concentration. Several operating variables, such as the current, pH and amount of NaCl added, were explored to ascertain their respective effects on the treatment efficiency. Optimum operating ranges for each of these operating variables were experimentally determined. The results of this study are as follows. 1. The satisfactory elimination of COD and SS was concurrently achived using Ti/Pt-PbO electrode. The optimum operating conditions were found to be 3ampere, pH 7.5, 5g NaCl/l and electrolytic reaction time of 6~9min. 2. Br^(-) emission rate was increased as a function of current, when operating conditions such as current and electrolytic time maintained inadequately, F^(-) was emitted. So, it was necessary to treat the emitted Br^(-) and F^(-) subsequently.

The Arabidopsis Transcription Factor NAC016 Promotes Drought Stress Responses by Repressing <i>AREB1</i> Transcription through a Trifurcate Feed-Forward Regulatory Loop Involving NAP

Sakuraba, Yasuhito,Kim, Ye-Sol,Han, Su-Hyun,Lee, Byoung-Doo,Paek, Nam-Chon American Society of Plant Biologists 2015 The Plant cell Vol.27 No.6

<P>The Arabidopsis transcription factor NAC016 activates drought stress responses by inducing <I>NAP</I> transcription and repressing <I>AREB1</I> transcription by binding to different regions of the <I>AREB1</I> promoter.</P><P>Drought and other abiotic stresses negatively affect plant growth and development and thus reduce productivity. The plant-specific NAM/ATAF1/2/CUC2 (NAC) transcription factors have important roles in abiotic stress-responsive signaling. Here, we show that <I>Arabidopsis thaliana</I> NAC016 is involved in drought stress responses; <I>nac016</I> mutants have high drought tolerance, and <I>NAC016</I>-overexpressing (<I>NAC016</I>-OX) plants have low drought tolerance. Using genome-wide gene expression microarray analysis and MEME motif searches, we identified the NAC016-specific binding motif (NAC16BM), GATTGGAT[AT]CA, in the promoters of genes downregulated in <I>nac016-1</I> mutants. The NAC16BM sequence does not contain the core NAC binding motif CACG (or its reverse complement CGTG). NAC016 directly binds to the NAC16BM in the promoter of <I>ABSCISIC ACID-RESPONSIVE ELEMENT BINDING PROTEIN1</I> (<I>AREB1</I>), which encodes a central transcription factor in the stress-responsive abscisic acid signaling pathway and represses <I>AREB1</I> transcription. We found that knockout mutants of the NAC016 target gene <I>NAC-LIKE, ACTIVATED BY AP3/PI</I> (<I>NAP</I>) also exhibited strong drought tolerance; moreover, NAP binds to the <I>AREB1</I> promoter and suppresses <I>AREB1</I> transcription. Taking these results together, we propose that a trifurcate feed-forward pathway involving <I>NAC016</I>, <I>NAP</I>, and <I>AREB1</I> functions in the drought stress response, in addition to affecting leaf senescence in Arabidopsis.</P>