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푸리에 변환과 Dense-SIFT를 이용한 비디오 기반 Face Spoofing 검출
한호택(Hotaek Han),박운상(Unsang Park) 한국정보과학회 2015 정보과학회논문지 Vol.42 No.4
얼굴 인식기반의 사용자 보안 시스템은 접근이 허가된 사용자의 사진이나 비디오를 이용한 공격에 취약하다는 단점을 가지고 있다. 본 연구에서는 인증되지 않은 사용자가 비디오를 이용하여 시스템에 접근할 경우 해당 공격 시도를 검출하기 위한 위변조(Spoof) 검출 방법을 제안한다. 제안하는 방법은 연속된 3개의 Frame에서 푸리에 변환과 Dense-SIFT 구분자를 사용하여 400개의 실제 및 위변조 비디오 영상을 대상으로 실험한 결과 99%의 검출 정확도를 보였다. Security systems that use face recognition are vulnerable to spoofing attacks where unauthorized individuals use a photo or video of authorized users. In this work, we propose a method to detect a face spoofing attack with a video of an authorized person. The proposed method uses three sequential frames in the video to extract features by using Fourier Transform and Dense-SIFT filter. Then, classification is completed with a Support Vector Machine (SVM). Experimental results with a database of 200 valid and 200 spoof video clips showed 99% detection accuracy. The proposed method uses simplified features that require fewer memory and computational overhead while showing a high spoofing detection accuracy.
곽호택(Hotaek Kwak),정수진(Soo-Jin Jeong) 한국자동차공학회 2020 한국자동차공학회 지부 학술대회 논문집 Vol.2020 No.6
This paper presents the method in integrated aluminum profile die design and simulation technology with the emphasis on product quality control and improvement. It includes balancing of the material flow by means of die design optimization, control of velocity deviation during extrusion process, controlling of location and strength of seam welds. The approach is based on numerical simulation software, QForm Extrusion and use automated die design software, QExDD(QForm Extrusion Die Designer). Some industrial case studies are discussed in this paper. Finally, we can obtain high quality profile shape without real die modification or re-creation by using our suggested virtual extrusion technology.
제올라이트 계열 흡착촉매에 의한 가솔린 차량의 냉시동 배기가스 저감 기술
이호택(HoTaek Lee),김원빈(WonBin Kim),인치범(ChiBum In),여권구(GwonKoo Yeo) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Cold start hydrocarbon is the key issue for the emission control of gasoline vehicles. The adsorber system has been studied to meet the stringent regulations with cost effective exhaust system. The key technical issues to be resolved for the practical use of the HC adsorber systems are the thermal stability of the adsorbent, the ability to adsorb major HC components from the cold exhaust system, the retention of the HC to the higher temperature, and the activation of the three way catalyst at the lower temperature. Zeolite Beta with various silica to alumina ratio have been studied for the adsorber. Low concentration of aluminum is beneficial for the stability of the zeolite. High contents of aluminum can accompany the undesired cracking of the adsorbed HC's to lighter ones which can be des orbed at the lower temperature. Steam showed the detrimental effect on the structure of the beta zeolite. High silica beta with minimal contents of alumina is favorable for the practical exhaust system with high durability. The HC adsorber catalyst system was applied for the under floor position and tested in FTP driving mode using 2.4 liter engine. The study gave the result that the HC adsorber system with lower cost can give the better performance in HC reduction than that of the conventional three way catalyst system.
패키지 속성이 자동차 구매 만족도와 재구매, 추천의도에 미치는 영향
이호택(Hotaek Lee),M.Vishal,T.Yashwant,이용(Yong Lee),김태엽(Taeyub Kim),남종용(Jongyong Nam),박인성(Inseong Park) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Consumers tend to evaluate overall satisfaction of a car by attribute-level performance, not overall-level. The impact of attribute-level performance on car overall satisfaction can be analyzed using the Structural Equation Model. In this paper, The attributes of a car are classified with the car package attribute-level at the product development point of view. This classification has advantages that the result of the analysis can be applied to practical development process. Finally, the impact of car package attribute-level performance on car overall satisfaction and repurchase & recommendation intentions is analyzed using the Structural Equation Model based on the survey data in India.
오호택(O Hotaek) 강원대학교 비교법학연구소 2021 江原法學 Vol.62 No.-
Ⅰ. 우리 사회에는 민주화의 후유증으로 법 경시 풍조가 남아 있다. 특히 국가기관에서도 법 위반 사례가 많다. 이런 국가기관의 위헌적 관행들을 살펴보고, 유형화를 시도한다. 결론적으로 위헌상태를 방지하거나 제거하기 위한 방안을 제시해 본다. Ⅱ. 정부와 국회의 사례: 청와대 비서실 중심의 국정운영, 청와대 특별감찰관과 북한인권대사의 공석사태, 국무총리의 국무위원 제청권 무력화, 법률에 반하는 명령, 사전합의에 의한 국회의장·부의장 선거, 상임위원장의 여야 배분, 법사위의 월권, 본인 의사에 반하는 상임위원 사ㆍ보임, 소위원회의 만장일치제, 예산안 법정처리 기한 도과, ‘의원 꿔주기’와 비례대표용 위성정당 창설 Ⅲ. 기타 : 헌법재판소장의 임기 불분명, 재판관과 사무차장 공석사태, 대법관 공석 사태, 법에 근거 없는 선관위원장 겸임, 중앙선관위원 공석사태, 중앙선관위원장과 선관위원의 임기보장, 감사원장의 감사위원 제청권 무력화, 감사원의 독립성 문제 Ⅳ. 분류와 제언: 국가기관의 위헌적 관행은 법규정에 위반되는 부작위와 작위, 입법적 개선이 필요한 사례, 부적절한 운영사례 등으로 나눌 수 있다. 이를 해결하기 위해서는 법률개정과 개헌을 포함하여 법체계 자체의 완성도를 높여야 한다. 또한 국가기관의 헌법준수 의식의 제고라는 두 가지 측면이 모두 강조되어야 한다. Ⅰ. In our society, the trend of neglect of laws remains as the aftereffect of democratization. In particular, there are many cases of violation of the law in national institutions. I will take a look the unconstitutional practices of these national institutions and tries to categorize them. In conclusion, I will propose a plan to prevent or eliminate the unconstitutional status. Ⅱ. Examples of the Government and the National Assembly: national administration centered on the Blue House Secretary Office, the situation of vacancy of the Blue House Special Inspector and the North Korean Human Rights Ambassador, neutralization of the Prime Minister’s proposal of the State Council member, ministerial order against the law, election of the chairman and vice chairman of the National Assembly by prior agreement, sharing the chair posts of the Standing Committees between the ruling and opposition parties, overpass of the Judiciary Committee, appointment of standing members contrary to his own intentions, unanimous agreement of Subcommittees, passing of deadlines for Budget resolution, borrowing member of the National Assembly, creation of a satellite party for proportional representation. Ⅲ. Others: Unclear terms of the President of the Constitutional Court, vacancy of Judges and Deputy Secretary Generals, vacancy of the Supreme Judge, the Supreme Judge’s concurrent of the Election Committee Chairman without legal basis, vacancy of the Central Election Commissioner, guarantee of the term of office of the Central Election Commissioner and Election Commissioner, neutralization proposal of the Chairman of the Board of Audit and Inspection, the issue of independence of the Board of Audit and Inspection Ⅳ. Classification and Suggestion: Unconstitutional practices of National Institutions can be divided into omissions and actions that violate legal regulations, cases requiring legislative improvement, and cases of inappropriate operation. In order to solve this problem, it is necessary to improve the completeness of the legal system itself, including revision of law and constitution. In addition, both aspects must be emphasized: raising the awareness of National Institutions to comply with the constitution.