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      • 데이터 마이닝의 범죄수사 적용 가능성

        김준우,손중권,이상한,Kim, Joon-Woo,Sohn, Joong-Kweon,Lee, Sang-Han 대한수사과학회 2006 대한수사과학회지 Vol.1 No.2

        데이터 마이닝은 컴퓨터와 정보처리의 발전으로 각기 다른 차원에서 다량으로 수집되는 데이터 속에서 숨은 의미나 패턴을 발견하는 유용한 기법이다. 의사결정나무, 신경망 모형, 규칙 귀납, K-평균 군집화, 시각화 등의 데이터 마이닝 개별 기법들은 산재해 있는 데이터에서 연관성을 분석하고, 이를 분류함으로써 일반화된 개념을 정의하고, 새로운 지식을 추론함으로써 실제 생활에 적용 가능한 예측을 가능하게 한다. 따라서 현재 데이터 마이닝은 기업의 마케팅 분야, 금융기관의 고객 분석, 통신 회사의 고객 이탈 방지 등에서 유용하게 활용되고 있다. 우리가 접해야 하는 정보의 양이 늘어나는 것은 범죄 수사에 있어서도 마찬가지 현상이다. 범죄와 범죄자에 대한 데이터는 축적되어 가지만 정작 개별 사안에 있어서는 중요한 데이터가 접근조차 되지 않고 있으며, 많은 데이터 속에서 이것이 내포하고 있는 숨은 의미를 지나치게 되는 경우도 많다. 본 연구에서는 선행 연구와 사례 적용을 통해 데이터 마이닝의 범죄 수사 적용 가능성과 한계점을 살펴보고자 하였다. 미제 사건으로 남는 경우가 많은 절도나 사기 같은 습관적 상습 범죄의 경우 데이터 마이닝의 분류, 군집화 기능을 활용 한다면 향후 여죄 추적에 효율적으로 활용될 수 있음을 파악할 수 있었고, 특히 다양한 문제에 적용 가능하고, 잡음에 대한 견고성이 있음에도 예측의 정확성을 지니고 있는 신경망 모형의 경우 패턴 인식을 통하여 범죄자 프로파일링이나 화상 자료 대비 시스템 구축에 충분히 활용될 것으로 생각한다. 특히 보험 사기 사례 적용에서 살펴본 바와 같이 마약, 테러와 같은 조직적 범죄수사나 자금세탁과 같은 금융 추적 수사의 경우 해당 자료의 방대함과 모호성으로 인해 수사를 하는 데 많은 어려움이 있지만 이러한 데이터 마이닝 가시화 기법을 적절히 활용한다면 전체적인 윤곽을 파악하는 데 매우 유용하며, 효율적인 수사가 가능함을 확인할 수 있었다. 그러나 데이터 마이닝은 예측 모델이므로 오류를 내재하고 있다는 점에서 수사 기관의 데이터 마이닝 접근은 조심스러워야 하며, 정보 독점화 현상과 개인 사생활 보호라는 측면에서 각 수사기관은 해당 법률에 정한 범위 내에서 해당 사건별로 데이터를 수집하고 이를 통합, 재구성하여 활용하는 측면으로 적용되어야 할 것이다. 또한 각 수사기관별로는 자신의 보유하고 있는 데이터에 대해 다차원 처리가 가능하도록 데이터베이스 시스템을 구축하여 데이터 마이닝이 적용 가능한 환경을 구축하도록 하여야 할 것이다. 아직은 논의의 초기 단계이므로 효과가 크게 부각되지는 않았지만 지금까지 제시한 문제에 대한 연구가 계속 이루어진다면 인권중심, 증거중심의 수사 개념을 바탕으로 적법절차에 의한 수사 활동을 요구받는 시대에 새로운 대안으로 자리 잡을 것이며, 수사의 과학화에 기여할 것으로 전망한다. Data mining is an information extraction activity to discover hidden facts contained in databases. Using a combination of machine learning, statistical analysis, modeling techniques and database technology, data mining finds patterns and subtle relationships in data and infers rules that allow the prediction of future results. Typical applications include market segmentation, customer profiling, fraud detection, evaluation of retail promotions, and credit risk analysis. Law enforcement agencies deal with mass data to investigate the crime and its amount is increasing due to the development of processing the data by using computer. Now new challenge to discover knowledge in that data is confronted to us. It can be applied in criminal investigation to find offenders by analysis of complex and relational data structures and free texts using their criminal records or statement texts. This study was aimed to evaluate possibile application of data mining and its limitation in practical criminal investigation. Clustering of the criminal cases will be possible in habitual crimes such as fraud and burglary when using data mining to identify the crime pattern. Neural network modelling, one of tools in data mining, can be applied to differentiating suspect's photograph or handwriting with that of convict or criminal profiling. A case study of in practical insurance fraud showed that data mining was useful in organized crimes such as gang, terrorism and money laundering. But the products of data mining in criminal investigation should be cautious for evaluating because data mining just offer a clue instead of conclusion. The legal regulation is needed to control the abuse of law enforcement agencies and to protect personal privacy or human rights.

      • E-MIND II를 이용한 고립 단어 인식 시스템의 설계

        김준우,정홍,김명원,Kim, Joon-Woo,Jeong, Hong,Kim, Myeong-Won 대한전자공학회 1995 전자공학회논문지-B Vol.b32 No.11

        This paper introduces an isolated word recognition system realized on a neurocomputer called E-MIND II, which is a 2-D torus wavefront array processor consisting of 256 DNP IIs. The DNP II is an all digital VLSI unit processor for the EMIND II featuring the emulation capability of more than thousands of neurons, the 40 MHz clock speed, and the on-chip learning. Built by these PEs in 2-D toroidal mesh architecture, the E- MIND II can be accelerated over 2 Gcps computation speed. In this light, the advantages of the E-MIND II in its capability of computing speed, scalability, computer interface, and learning are especially suitable for real time application such as speech recognition. We show how to map a TDNN structure on this array and how to code the learning and recognition algorithms for a user independent isolated word recognition. Through hardware simulation, we show that recognition rate of this system is about 97% for 30 command words for a robot control.

      • KCI등재

        중첩된 이동 네트워크 환경에서 지역적 정보를 이용한 경로 최적화 방안

        김준우,박희동,이강원,최영수,조유제,조봉관,Kim Joon woo,Park Hee dong,Lee Kang won,Choi Young soo,Cho You ze,Cho Bong kwan 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.4B

        네트워크 단위의 이동성을 지원하는 network mobility (MEMO) 기술에서는 중첩된 네트워크 환경 (nested NEMO)에서 전달 지연 시간을 줄이는 경로를 최적화에 관현 연구가 활발히 이루어지고 있다. 현재 대표적인 경로 최적화 방안으로는 확장 헤드를 이용하여 경로 정보를 모두 기록하는 RRH (Reverse Routing Header)와 최상위 MR에서 하부에 위치한 MR의 상태 정보를 관리하는 BHT (Bi-directional tunnel between Home agent and Top level mobile route)이 제안되어 있다. 하지만 기존의 방안들은 중첩 깊이가 증가할수록 패킷 전달을 위한 오버헤드가 증가하는 문제가 발생한다. 본 논문에서는 중첩된 이동 네트워크 환경에서 지역적 정보를 이용한 경로 최적화 방안 (RIRO; Regional Information-based Route Optimization)을 제안하고자 한다. RIRO 방안에서는 모든 MR들은 자신의 하부에 위치한 MR들의 위치 정보를 관리하고 라우팅 헤더를 이용하여 패킷 전달 경로를 최적화하는 방안으로 중첩된 환경에서도 패킷이 전달을 위한 오버헤더가 증가하지 않는 장점이 있다. NEMO basic support is a solution that provides network mobility in the Internet topology. Yet, when multiple mobile networks are nested, this basic solution suffers ken pinball-routing and a severe routing overhead. Therefore, several solutions for route optimization in a nested mobile network have already been suggested by the IETF NEMO WG. However, the current paper proposes Regional Information-based Route Optimization (RIRO) in which mobile routers maintain a Nested Router List (NRL) to obtain next-hop information, and packets are transmitted with a new routing header called an RIRO Routing Header (RIRO-RH). We showed that RIRO had the minimum packet overhead that remained constant, irrespective of how deep the mobile network was nested, in comparison with two earlier proposed schemes - Reverse Routing Header (RRH) and Bi-directional tunnel between HA and Top-Level mobile router (BHT).

      • KCI등재

        대학도시 포항의 가능성에 대한 고찰

        김준우(Kim Joon-Woo),이대준(Lee Dae-Jun) 한국문화산업학회 2007 문화산업연구 Vol.7 No.2

        In this paper, we are looking into a connection of the city and the university, for changing the city from industrial city to pro-environmental city that combines cultural and tourist-concept. The Bologna University, which was built about one thousand years ago, and the Heidelberg University, the university of 600 years’ tradition, have intimately associated with cities’ growth. Those universities started above tells us that traditionally, universities and cities are correlated. The advantages that universities give to cities are: first, educate men of high abilities for the need in economics, politics, industries of the society; second, possesses the techniques, which have competitive power, by doing researches and experiments that are hard for enterprises to manage; third, afforestation of the city by making open spaces that consider the utilities and the plans of city spaces, and by protecting the nature; fourth, improves the standards and makes a unification of communities, by reeducating the citizens. With the gift of beautiful natural setting, since 1970s, Pohang had successful industrial images due to international steel industry. Even with Pohang's successful industrial images, the standards of citizens’lives are not getting better. This fact also affects outflow of citizens in Pohang. At the end of 20th century, international campaign of nature-Local Agenda 21- got spread, the importance of nature became influential. As people realize the devastation of nature are equal to the loss of the useful spaces, it threatened dignity of human lives. So suggestion of making Pohang to a Campus City is to recover Pohang’s true character and leap to the fascinated competitive city in 21st century. And making Pohang to a campus city also makes citizens to participate voluntarily by reeducating them and giving them a motive. This suggestion is for unity of the universities, citizens and the cities. In this paper, we are looking into a connection of the city and the university, for changing the city from industrial city to pro-environmental city that combines cultural and tourist-concept. The Bologna University, which was built about one thousand years ago, and the Heidelberg University, the university of 600 years’ tradition, have intimately associated with cities’ growth. Those universities started above tells us that traditionally, universities and cities are correlated. The advantages that universities give to cities are: first, educate men of high abilities for the need in economics, politics, industries of the society; second, possesses the techniques, which have competitive power, by doing researches and experiments that are hard for enterprises to manage; third, afforestation of the city by making open spaces that consider the utilities and the plans of city spaces, and by protecting the nature; fourth, improves the standards and makes a unification of communities, by reeducating the citizens. With the gift of beautiful natural setting, since 1970s, Pohang had successful industrial images due to international steel industry. Even with Pohang's successful industrial images, the standards of citizens’lives are not getting better. This fact also affects outflow of citizens in Pohang. At the end of 20th century, international campaign of nature-Local Agenda 21- got spread, the importance of nature became influential. As people realize the devastation of nature are equal to the loss of the useful spaces, it threatened dignity of human lives. So suggestion of making Pohang to a Campus City is to recover Pohang’s true character and leap to the fascinated competitive city in 21st century. And making Pohang to a campus city also makes citizens to participate voluntarily by reeducating them and giving them a motive. This suggestion is for unity of the universities, citizens and the cities.

      • 구속다리를 갖는 저자유도 병렬형 로봇의 강성 해석

        김준우(Joon-Woo Kim),김한성(Han-Sung Kim),경진호(Jin-Ho Kyung) 한국공작기계학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-

        This paper presents the stiffness analysis of a low-DOF parallel robot with constraining legs, which takes into account of elastic deformations of joints and links. The parallel manipulator in this study is made up of three S-P-S (Spherical-Prismatic-Spherical) legs and one U-P (Universal-Prismatic) leg. The role of the U-P leg constrains the motion of the moving platform to 3-DOF and three prismatic joints in S-P-S legs are actuated. The reaction forces due to actuations and constraints in each serial chain can be determined by making use of the theory of reciprocal screws. It is shown that the stiffness of a 3-DOF parallel manipulator can be modeled such that the moving platform is supported by 6 springs related to the reciprocal screws of actuations and constraints. A general 6×6 stiffness matrix is derived, which is the sum of the stiffness matrices of actuations and constraints. The compliance of each spring can be precisely determined by modeling the compliance of joints and links in a serial chain as follows; a link is modeled as an Euler beam and the compliance matrix of rotational or prismatic joint is modeled as a 6×6 diagonal matrix, where one diagonal element about the rotation axis or along the sliding direction is infinite. By summing joint and link compliance matrices with respect to a reference frame and applying unit reciprocal screw to the resulting compliance matrix of a serial chain, the compliance of a spring is determined by the resulting infinitesimal displacement. Using the suggested methodology, the stiffness of the parallel robot with one constraining leg has been analyzed. Finally, a numerical example of the optimal design to maximize stiffness in a specified box-shape workspace is presented.

      • KCI등재
      • KCI등재

        콜타르피치를 이용한 Invar 합금 위 탄소나노튜브의 합성

        김준우(Joon-Woo Kim),정구환(Goo-Hwan Jeong) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.6

        We report the growth of carbon nanotubes (CNT) on Invar-42 plates using coal tar pitch (CTP) by chemical vapor deposition (CVD) method. The solid phase CTP is used as an inexpensive carbon source since it produces a bunch of hydrocarbon gases such as CH₄ and other CxHv by thermal decomposition over 450℃. The Invar-42 is a representative Ni-based ferrous alloy and can be used repetitively as a substrate for CNT growth because Ni and Fe are used as very active catalytic elements. We changed mixing ratio of carrier gases, argon and hydrogen, and temperature of growth region. It was found that the optimum gas ratio and temperature for high quality CNT growth are Ar:H₂ = 400:400 sccm and 1000℃, respectively. In addition, the carbon nanoball (CNB) was also obtained by just changing the mixing ratio to Ar:H₂ = 100:600 sccm. Finally, CTP can be employed as a versatile carbon source to produce various carbon-based nanomaterials, such as CNT and CNB.

      • KCI등재

        Cu 담지 Ti-SBA-15 촉매의 선택적 CO 산화 반응

        김준우 ( Joon Woo Kim ),박재우 ( Jae Woo Park ),이종수 ( Jong Soo Lee ),최한슬 ( Han Seul Choi ),정석진 ( Suk Jin Choung ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.4

        고분자 전해질 연료전지 구동 시 양극 활성 물질에 대한 CO 피독을 방지하기 위해 Cu를 촉매 활성 종으로 사용하고 반응물의 확산이 용이한 몇 가지 메조 세공 물질을 지지체로 이용하여 CO 선택적 산화 반응(PROX반응)을 실시하였다. 그 결과 거대 세공을 가진 SBA-15를 지지체로 사용했을 때 우수한 CO 산화 활성을 보였으며 특히 Cu 담지 량에 비례하여 활성은 증가하였다. 또한 Cu의 분산도를 높이고자 첨가한 Ti 성분은 저온에서 CO 산화 성능을 높이는데 기여하였다. 특히 Ti 성분을 20 wt-% 첨가한 Cu/Ti20-SBA-15 촉매에서 Cu의 분산도가 가장 우수하였으며 CO 산화 활성 역시 개선됨을 확인하였다. The CO preferential oxidation reaction (PROX) has been done using Cu catalytic active species supported on some of mesoporous silica materials which can facilitate the diffusion of the reactants in order to prevent the poisoning of anode active materials by CO molecules during driving polymer electrolyte fuel cells (PEMFC) in this study. As a result when SBA-15 with large pore used as a support showed excellent CO oxidation activity, especially the activity increased in proportion to the amount of supported Cu. Ti components which was inserted to increase the degree of dispersion of Cu, contributed to improving the performance for CO oxidation at low-temperature. The degree of dispersion of Cu ingredients was the best in the catalyst inserted 20 mol-% Ti into the framework of SBA-15, and CO oxidation activity was also improved.

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