유전자 알고리즘을 이용한 대잠 탐색패턴 최적화 기법 개발

김문환,서주노,박평종,임세한,Kim, Moon-Hwan,Sur, Joo-No,Park, Pyung-Jong,Lim, Se-Han 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.1

It is hard to find an operation case using anti-submarine searching pattern(ASSP) developed by Korean navy since Korean navy has begun submarine searching operation. This paper proposes the method to develop hull mount sonar(HMS) based optimal submarine searching pattern by using genetic algorithm. Developing the efficient ASSP based on theory in near sea environment has been demanded for a long time. Submarine searching operation can be executed by using ma ulti-step and multi-layed method. however, In this paper, we propose only HMS based ASSP generation method considering the ocean environment and submarine searching tactics as a step of first research. The genetic algorithm, known as a global opination method, optimizes the parameters affecting efficiency of submarine searching operation. Finally, we confirm the performance of the proposed ASSP by simulation.

Hybrid type linear motor의 설계와 추력특성시험

김문환,Kim, Moon-Hwan 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.10

저가격형으로 프로토타잎 하이브리드형 리니어 펄스 모터(LPM)가 편측형으로 설계되었다. 모터의 정특성 및 동특성 측정위한 측정기기를 설계 제안하였다. 실험측정결과 프로토타잎 리니어 펄스 모터의 정특성 및 동특성을 구체적인 추력의 값으로 확인하였다. 프로트타잎 리니어 펄스 모터를 구형파와 마이크로스텝 구동으로 구동하여 각각의 경우의 추력의 변화를 확인하였다. 실험결과 마이크로스텝구동방식에서 추력리플이 현저히 줄어든 것을 확인할 수 있었다. A Hybrid type Linear Pulse Motor(LPM) for low cost is designed as single side stator structure. The static and dynamic characteristics measurement systems are designed. Experimental measurement systems, which measure the static and dynamic characteristic of the LPM, are uggested for the prototype LPM. It becomes known the values of the thrust forces. Finally the microstep drive method is adopted to the drive of prototype LPM. The waveform difference is measured between the microstep method and rectangular wave. From the experimental results, it can be confirmed that the repetitive ripple of the thrust force of the prototype LPM are reduced by taking the microstep drive method.

엄지발가락가쪽휨증의 엄지벌림근 전기자극 시 첫 번째 발허리발가락관절의 운동형상학적 움직임 분석

김문환,고은경,정도영,Kim, Moon-Hwan,Koh, Eun-Kyung,Jung, Do-Young 대한물리치료학회 2012 대한물리치료학회지 Vol.24 No.4

Purpose: The purpose of this study is to compare the kinematic motion of the first metatarsophalangeal (MTP) joint during an electrical stimulation of abductor hallucis (AbdH) muscle, between the normal group and the hallux valgus (HV) group. Methods: A total of twenty subjects (normal group=10 and HV group=10) participated in this study. The kinematic motions of first MTP joint was measured by using 3-dimensional motion analysis during an electrical stimulation in the sitting position. The intensity of an electrical stimulation was set to be tolerated in each subject, and the data of kinematic motions were collected in three trials of 5 seconds. An independent t-test was used to compare the angle of flexion and abduction of the first MTP joint and proximal phalanx in frontal plane, between the normal and HV groups. Results: Participants showed that the angle of flexion was significantly greater in the HV group ($13.12{\pm}10.61^{\circ}$), compared to that of the normal group ($10.17{\pm}2.31^{\circ}$); and the angle of abduction was significantly smaller in the HV group ($10.61{\pm}4.99^{\circ}$) than that of the normal group. Also, the angle of the proximal phalanx in frontal plane was significantly smaller, compared to the normal group ($53.42{\pm}10.70^{\circ}$) (p<0.05). Conclusion: These findings suggest that dysfunction of AbdH muscle is apparent in HV deformity and provide insight into potential risk factors for the development of HV deformity.

다양한 버퍼층 위에 증착한 In₂O₃ 박막의 구조, 광학 및 전기적 특성

김문환,Kim, Moon-Hwan 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.7

The effects of various buffer layers on the $In_2O_3$ transparent conducting films grown on glass substrates by radio-frequency reactive magnetron sputtering were investigated. The $In_2O_3$ thin films were deposited at $400^{\circ}C$ of growth temperature and 100% of oxygen flow rate. The optical, electrical, and structural and morphological properties of the $In_2O_3$ thin films subjected to buffer layers were examined by using ultraviolet-visible spectrophotometer, Hall-effect measurements, and X-ray diffractometer, respectively. The properties of $In_2O_3$ thin films showed different results, depending on the type of buffer layer. As for the $In_2O_3$ thin film deposited on ZnO buffer layer, the average transmittance was 89% and the electrical resistivity was $7.4{\times}10^{-3}\;{\Omega}cm$. The experimental results provide a way for growing the transparent conducting film with the optimum condition by using an appropriate buffer layer.

불교적 관점에서 본 쇼펜하우어의 미학 사상

김문환(Moon Hwan Kim) 한국미학회 2001 美學 Vol.31 No.-

Extraction of Human Body Using Hybrid Silhouette Extraction method in Intelligent Robot System

김문환(Moon Hwan Kim),주영훈(Young Hoo Joo),박진배(Jin Bae Park),조영조(Young Jo Cho),지수영(Su Young Chi),김혜진(Hye Jin Kim) 한국지능시스템학회 2005 한국지능시스템학회 학술발표 논문집 Vol.15 No.2

This paper discusses a human body extraction method for mobile robot system. The skeleton features are used to analyze human motion and pose estimation. The intelligent robot system requires more robust silhouette extraction method because it has internal vibration and low resolution. The new hybrid silhouette extraction method is proposed to overcome this constrained environment. Finally, the experimental results show the superiority of the proposed method.

韓國近代美學의 前史

金文煥(Kim Moon Hwan) 고려대학교 한국학연구소 1991 한국학연구 Vol.4 No.-

병렬 유전 알고리즘 기반 meta-유전 알고리즘을 이용한 교차율과 돌연변이율의 최적화

김문환(Kim Moon Hwan),박진배(Jin-Bae Park),이연우,주영훈(Young-Hoon Joo) 한국지능시스템학회 2002 한국지능시스템학회 학술발표 논문집 Vol.12 No.2

Extraction of Human Body Using Hybrid Silhouette Extraction Method in Intelligent Robot System

김문환(Moon Hwan Kim),주영훈(Young Hoon Joo),박진배(Jin Bae Park),조영조(Young Jo Cho),지수영(Su Young Chi),김혜진(Kim hye Jin) 한국지능시스템학회 2005 한국지능시스템학회논문지 Vol.15 No.7

본 논문은 지능형 로봇 시스템을 위한 인간 몸의 하이브리드 실루엣 추출 기법을 제안한다. 지능형 로봇은 내부적인 진동과 낮은 해상도로 인해 강인한 실루엣 추출을 필요로 한다. 이를 극복하기 위해서 본 논문에서는 하이브리드 실루엣 추출 기법을 제안하였다. 하이브리드 실루엣은 영상간의 공간차 및 시간차 정보를 고려 생성되며 움직임 영역 모델을 통해 두 정보간의 중요성에 가중치를 준다. 최종적으로 설험결과를 통해 제안된 기법의 우수성을 확인 하였다. This paper discusses a human body extraction method for intelligent robot system. The intelligent robot system requires more robust silhouette extraction method because it has internal vibration and low resolution. The new hybrid silhouette extraction method is proposed to overcome this constrained environment. The temporal and gradient information is combined as hybrid silhouette. The motion region model is used to adjust combining parameters in hybrid silhouette. Finally, the experimental results show the superiority of the proposed method.

미국 소비자 신용의 최근 동향

김문환(Kim Moon Hwan) 국민대학교 법학연구소 2010 법학논총 Vol.22 No.2

With more than 641 million credit cards in circulation and accounting for an estimated $1.5 trillion of consumer spending, the U. S. economy has clearly gone a plastic money. Millions of American families use their personal, general-purpose credit cards such as Visa, Mastercard, American Express and Discover. Credit cards have long been a very good deal for people who pay their bills on time and in full. In the early 1980s, the credit-card business was a quiet, slightly boring industry in the States. Banks gave credit cards only to the best consumers and charge them a flat interest rate of about 20 percent and an annual fee. The profitability of credit cards really began from the middle of 1980s, when the banking industry successfully eliminated a critical restriction: the limit on the interest rate a lender can charge a borrower. Deregulation, coupled with a revolution in technology that enables the almost real-time tracking of personal financial information and the emergence of nationwide banking, has facilitated the widening availability of credit cards across the economic spectrum. But for some, the cost of credit is often far greater than it appears. With the relaxing of usury laws in some states, and the ready availability of credit scores in the late 1980s, banks began offering cards with a variety of different interest rates and fees, tying the pricing to the credit risk of the cardholder. Then the math whizzes arrived. They emphasized that the biggest profits did not come from people who always paid off their bills but rather from less-responsible clients through skyrocketing interest rates, late fees and other penalties. Since 1995, the percentage of the industry’s income from cardholder fees has more than doubled to 40 percent. In 2007, credit-card companies collected $ 40.7 billion in profits before taxes. Today Americans carry an average of 5.3 all-purpose cards in their wallets, and the average household has $10,679 in credit-card debt, according to the Nilson Report. A growing share of the industry's revenues come from what they call deceptive tactics, such as “default” terms spelled out in the fine print of cardholder agreements. Penalty fees and rates are sometimes triggered by just a single lapse. This flurry of unexpected fees and rate hikes come just when consumers can least afford them. With many consumers mired in debt and angry at what they consider gouging by credit card companies, however, the issue of credit card reform has gained broad populist appeal. Members of Congress and the Obama administration have seized on the discontent to push for reforms that the industry succeeded in tamping down when the economy was flying high. The Capitol Hill voted overwhelmingly on May 2009, to put new restrictions on the credit card industry, passing a bill whose backers say will make card-issuers spell out their terms in fewer words, using plain English, and treat customers more fairly. In response to the prospect of lost revenue, banks are expected to look at reviving annual fees, curtailing cash-back and other rewards programs and charging interest immediately on a purchase instead of allowing a grace period of weeks. The industry claims that the new legislation will force banks to issue fewer credit cards at greater cost to the current cardholders and make credit harder to get at a time when many Americans need it. The law would further squeeze banks' revenue when they are being hit with a high rate of credit card charge-offs. The government's stress tests showed that the nation's 19 biggest banks will take on $ 82 billion in credit card losses in the next two years. The recent economic downturn challenged that formula, and banks started dumping the riskiest customers and lowering their credit limits in earnest as the recession accelerated. Now, consumers who pay their bills off every month are issuing a rising chorus of complaints about shortened grace periods, new hidden fees and higher i 1. 개요 2008년 미국에서 금융위기가 발생하여 대형 은행들이 파산위기에 직면 하면서 이에 따른 고실업, 저소비로 경제적 고통을 받고 있는바, 이러한 미국의 높은 실업률은 금융기관의 신용카드 연체율과 관계가 깊다. 미국에서 소비자보호 업무를 담당하는 연방준비위원회 (Federal Reserve Board, FRB)에 따르면 2008년 현재 미국 소비자의 빚은 2조 5,600달러로 심각한과소비 상태였음이 드러났다. FRB는 경제위기로 힘들어진 소비자의 금융부분 규제를 위하여 지난 2년간 약탈적인 대부(predatory loans), 남용적인주택금융대부 관행(abusive mortgage practices), 불투명한 주택자산대부(opaque home equity loans)와 신용카드에 관한 정보의 오도(misleading information) 등에 관련한 규정들을 새로이 개정하거나 제정하여 왔다. 특히 오바마 행정부에서는 은행 등 금융기관이 기만적인 금융행위를 하는 경우를 찾아내어 이를 시정함으로서 소비자를 보호하는 여러 가지조처를 강력하게 추진하여 왔다. 이러한 노력이 결실을 보아 연방의회가 2009년 5월 소비자를 강력하게 보호하는 포괄적인 신용카드 입법(Credit Card Act of 2009)을 제정하였다. 동 입법의 공식 명칭은 “신용카드기록 보존책임과공개법” (Credit Card Accountability Responsibility and Disclosure Act of 2009)인바, 동법은 1968년 聯邦議會가 거래조건의 공개규정을 중심으로 제정한 貸付眞實法(Truth in Lending Act, TILA)과 다른 여러 입법의 내용을 수정한 내용이다. 동법은 금융기관이 소비자에게 좀 더 친절하게 신용카드 사업을 하도록 규정한 점에서 소비자들의 승리를 가져온 입법이다. 개정 입법은 카드 회사가 급속하거나 소급적인 방법으로 신용카드 이자율을 인상하지 못하게 할 뿐만 아니라, 가혹한 위약금수수료 부과나 돈을 단기간에 갚게 하거나 기타 다른 남용적인 업무를 금지하고 있다. 그 핵심은 신용카드회사들이 함부로 수수료와 이자율(fees and rate)을 변경하지 못하도록 한 것이다. 앞으로 신용카드회사들이 수수료를 인상하려면 이를 소비자에게 통지하여야 하며, 나아가 대학생들에게 신용카드를 광고하는 것을 훨씬 어렵게 하였다. 새로운 신용카드 입법은 대체로 2010년 2월 22일 부터 효력을 가진다. 그러나 미국은행연합회(American Bankers Association)는 새로운 입법으로 은행들이 모든 카드회원들에게 다시 연회비(annual fees)를 부과하기 시작할 것이며, 이자율(interest rates)도 오히려 높아지게 될 것이라고 주장하였다. 그래서 결과적으로 카드대금을 정시에 납부하는 신용이 높은회원들이 불리하게 될 것이라고 전망한다. 그러나 오바마 대통령은 입법의 목적은 재정적으로 무책임한 사람들을 보호하려는 의도가 아니고 카드회사가 이득이 생기게 하는데 있다고 주장하였다. 또한 금융계에서는 동법이 새로이 개정됨으로서 신용도가 낮은 카드회원들은 카드의 갱신이 어렵게 되었을 뿐만 아니라, 돈을 빌리기가 훨씬 어렵게 되었다면서 강력하게 반대의견을 나타내었다. 2. 신용카드 종래 미국에서 신용카드 발행회사의 수입원은 카드가맹점으로부터 받 는 가맹점수수료와, 신용카드 회원에게서는 연회비(annual fee)와 이자(interest)를 받는 구조로 운영되었다. 은행들이 신용이 높은 소비자들에게만 신용카드를 발급하여 대략 20%의 균일한 이자율을 부과하였으며연회비도 그러하였다. 그러나 1980년대에 들어와 금융기관들이 신용카드의 이용도를 늘리기 시작하였는데 마침 여러 주가 유연한 대금업법(usury laws)을 채택하는 등의 규제완화(deregulation) 바람으로 카드회사의 수지가 본격적으로 늘어나기 시작하였다. 그러면서 누구나 쉽게 신용카드를 발급받게 되었고 은행들은 카드 회원의 신용위험을 측정하여 이자율과 연회비가 다양한 카드를 발급하기 시작하였다. 그런 후