교육과정 수정의 실제

최기상 국립특수교육원 2004 자격연수 Vol.- No.2

코드패치 및 하이브리드 분석 환경을 활용한 악성코드 데이터셋 추출 프레임워크 설계

최기상,최상훈,박기웅,Ki-Sang Choi,Sang-Hoon Choi,Ki-Woong Park 한국정보보호학회 2024 정보보호학회논문지 Vol.34 No.3

악성코드는 금전적인 목적에 의하여 서비스의 한 형태로 블랙마켓에 판매되고 있다. 판매에 따른 수요가 증가함에 따라 악성코드를 통한 공격이 확장되었다. 이에 대응하기 위해 인공지능을 활용한 탐지 및 분류 연구들이 등장하였지만, 공격자들은 분석을 방지하고자 다양한 안티 분석기술을 악성코드에 적용하고 있다. 본 논문에서는 안티 분석 기술이 적용된 악성코드들로부터 데이터셋을 확보하기 위해 하이브리드형 바이너리 분석 프레임워크 Malware Analysis with Dynamic Extraction(MADE)을 제안한다. MADE 프레임워크는 Anti-VM, Anti-Debugging이 적재된 바이너리를 포함하여 자동화된 동적 분석을 수행할 수 있다. MADE 프레임워크는 Anti-Analysis 기술이 적용된 다양한 악성코드들에 대해 90% 이상 우회가 가능하며, API 호출 정보를 포함한 데이터셋 추출이 가능함을 실험을 통해 검증하였다. Malware is being commercialized and sold on the black market, primarily driven by financial incentives. With the increasing demand driven by these sales, the scope of attacks via malware has expanded. In response, there has been a surge in research efforts leveraging artificial intelligence for detection and classification. However, adversaries are integrating various anti-analysis techniques into their malware to thwart analytical efforts. In this study, we introduce the "Malware Analysis with Dynamic Extraction (MADE)" framework, a hybrid binary analysis tool devised to procure datasets from advanced malware incorporating Anti-Analysis techniques. The MADE framework has the proficiency to autonomously execute dynamic analysis on binaries, encompassing those laden with Anti-VM and Anti-Debugging defenses. Experimental results substantiate that the MADE framework can effectively circumvent over 90% of diverse malware implementations using Anti-Analysis techniques and can adeptly extract relevant datasets.

고등학교 장애학생 진로·직업 교육 내실화를 위한 지표 개발

최기상,김진철,박혜영,박희찬,이효자,황윤의 국립특수교육원 2010 특수교육연구 Vol.18 No.1

This research focuses on the present condition of vocational education and preparing careers in establishments in special high schools which are setting in secondary education class in special education school, special education classroom in general education high school or inclusive high school. The method of this research was to analyze the literature analysis on literature reviews on career, vocational education, career rehabilitation education, general education and special education for students with disabilities. Using the content and the results the researchers used precedent research to implement ule literature analysis; they developed a rough draft of directions. Then the rough draft was investigated with Delphi Technique for 3 times with 32 specialists of career, vocational education, and special education staff. The direction was completed through the research committee after a total of 10 times The indicators developed were composed of three parts: Input, process, and output of career and vocational education for high school students with disabilities. The input indicators were focused on present conditions and matters for career and vocational education, such as perceptions, system, equipments, budget, etc. The process indicators were focused teaching-learning for career and vocational education, such as individualized education program, managing the curriculum, connection between society and region, job preparation, man power and vocational education. The output indicators were focused results for career and vocational education, such as percentage of employment, entering college or university, vocational training for career, achievement of educational goal, etc. This research was developed based on the direction of the curriculum emphasis and present conditions for future career and vocational education with school sites, institutions, and companies. The direction is to know the present condition along with the school and the companies to prepare the curriculum and necessary equipment for the students from now on. Henceforth, an adequate verification will complete the direction through an investigation for research of field suitability.

첼로 브릿지의 진동 분석

최기상,Choi Gi-Sang 한국음향학회 2006 韓國音響學會誌 Vol.25 No.5

Vibration of string is transmitted to the front plate through bridge to cause resonance of the instrument body in viol family string instruments. Therefore. the properties. geometrical shape. and positioning of the bridge are expected to have some effect on the sound color. In this study the strain and the stress in the bridge. and the force exerted on the top plate by the bridge as the string vibrates the bridge in cello are calculated through simulation based on the theory of elasticity. The modes of vibration and the characteristic frequencies are also found. Furthermore. the effect of geometric shape of bridge on sound color is studied in terms of frequency response. The results of this study show that the vibration characteristics of bridge is quite complex and the properties and the geometrical shape of bridge have significant effect on sound color, and therefore. the sound color of a cello can be controlled by changing the geometrical shape of bridge. 비올족 현악기에서 현의 진동은 브릿지에 의해 전판에 전달되어서 악기 몸통을 공명시킨다. 따라서 브릿지의 재질, 기하학적 형상, 설치 위치 등이 음색에 영향을 미치게 된다. 본 연구에서는 첼로에서 현에 의해 변위가 가해질 때 브릿지 내부의 변형, 응력, 그리고 브릿지 다리에 의해 전판에 미치는 힘을 탄성학적으로 해석하고, 브릿지의 고유진동모드와 고유진동주파수 등을 구하였다. 또, 브릿지의 형상이 음색에 미치는 영향을 주파수 응답의 관점에서 측정하였다. 본 연구의 결과는 첼로에서 브릿지의 진동특성은 대단히 복잡하고, 그 재질, 형상 등이 음색에 큰 영향을 미치며, 따라서 브릿지의 형상을 변화시킴으로써 첼로의 음색을 조정하는 것이 가능함을 실험적으로 보였다.

신경회로망을 이용한 밀링 작업에서의 공구 감시

최기상 서울市立大學校 1992 論文集 Vol.26 No.-

An on-line tool wear detection system for face milling operations is developed, and experimentally evaluated. The system employs multiple sensors(AE sensor and dynamometer), and the signals from these sensors are processed using multichannel autoregressive (AR) series model. Decision on the state of cutting tool was made by neural network (multilayered perceptron) using the AR coefficients as input pattern. To learn the necessary input/output mapping for tool wear detection, the parameters of the network are adjusted according to the back propagation (BP) method during off-line training. The results of experimental evaluation show that the system works well over a wide range of cutting conditions (feed rate, depth of cut), and the ability of the system to detect tool wear is improved due to the generalization and self-organizing properties of the neural network.

精密 다이아몬드 加工에서의 Acoustic Emission 現狀

崔基相 서울市立大學校 1995 論文集 Vol.29 No.-

AE를 利用해 切削工程을 成功的으로 監視하기 위해서는 그 信號의 特性과 切削의 力學關係를 連結시켜 주는 모델이 必要하다. 이 硏究에서는 다이아몬드 工具를 利用한 精密加工에서 工具의 餘裕面과 工作物의 接觸에 의한 AE의 發生을 解析하기 위한 모델이 開發된다. 이 모델은 AE RMS 電壓이 非線型 特性 때문에 切削깊이가 작을 때 切削깊이와 좋은 聯關關係를 보인다고 豫測하였고 이는 實驗에 의해 立證되었다. 따라서 AE는 精密 다이야몬드 加工에서 切削깊이의 작은 變動들을 監視하고 制御하는데 有用하게 쓰일 수 있을 것이다. For successful monitoring of machining process using AE, signal, a model which relates the signal features to the machining action is neccessary. In this study a theoretical model to analyze the AE generation at the tool flank-workpiece contact in diamond turning is developed. The model predicts and the experimental results confirms that the AE RMS level correlates better with the smaller depth of cut due to its nonlinear behavior, hence is useful monitoring of small fluctuations in depth of cut in precision diamond turning.

경사절삭에서 Acoustic Emission의 발생

최기상 서울市立大學校 1993 論文集 Vol.27 No.-

이 논문에서는 경사절삭에 있어서 AE (Acoustic Emission)와 절삭 파라미터 사이의 관계를 연구한다. 구체적으로, AE 에너지 (RMS AE level)와 절삭과정에서 소모되는 에너지와의 비례관계에 대한 이론적 배경을 설명하고, RMS AE level의 모델이 유도된다. 그리고 이 이론적 모델은 실험적으로 평가된다. This study aims to investigate the relationship between AE (Acoustic Emission) and the cutting parameters in oblique metal cutting. Specifically, a theoretical background for the proportionality between AE Energy (RMS AE level) and the rate of work done in the cutting process is provided, and an expression for the RMS AE level is derived. Also, the theoretical predictions of RMS AE level is experimentally evaluated.

첼로 현의 진동분석

최기상,Choi, Gi-Sang 한국음향학회 2008 韓國音響學會誌 Vol.27 No.8

바이올린, 비올라, 첼로, 콘트라베이스 등 비올족 현악기는 현의 진동이 브리지를 통해 몸체로 전달되고 공명을 일으켜 큰 소리를 내게 되어 있다. 즉 현악기에서는 현의 진동이 음원이 되며 현의 재질, 구조와 경계조건이 음색에 결정적 영향을 미치게 된다. 본 연구에서는 첼로에서 한쪽 끝은 고정되고 다른 끝은 손가락에 의해 운지된 현의 진동을 양 끝이 고정된 개방현의 진동과 비교하여 해석하고 실험하였다. 해석과 실험의 결과는 운지된 현의 진동이 양단이 고정된 개방현의 진동과 크게 다른 것을 보여준다. 또 운지된 현에서 손가락 끝과 현의 접촉 조건에 의해서도 음색이 크게 달라지므로 접촉조건을 조절함으로써 악기의 음색을 바꿀 수 있음을 설명해 준다. In viol family string instruments vibration of string is transmitted to the front plate through bridge to cause resonance of the instrument body. Therefore, the vibration of string is the source of sound and the properties, the structure, and the boundary conditions of string are expected to have significant effect on the sound. In this study the vibration of strings in cello when one end is fixed and the other end is pressed with finger tip is studied and compared with the case of the fixed-fixed ends. The result of analysis and experiment shows that the vibration of the string that is fixed at one end and pressed with finger tip at the other end is significantly influenced by the contact condition of the string with the finger tip and also quite different from that of the fixed-fixed string, It also suggests that the sound of a cello can be significantly influenced by the contact condition between the string and the finger tip in the fingered string.

어브레이시브 워터제트를 이용한 알루미나 세라믹스의 가공

최기상,최기흥,김정수 대한기계학회 1994 대한기계학회논문집 Vol.18 No.8

In this paper, a model of material removal in abrasive water jet machining of brittle material is developed, and experimentally evaluated. Abrasive water jet machining proved to yield better material removal rate than other machining techniques for hard and brittle material (alumina ceramics). It was also found that large scale fracture may develop at the exit of the jet from the material. The fracture size was predicted as a function of water jet pressure and size of the hole. Finally, the feasibility of using acoustic emission signals for in-process monitoring of the abrasive water jet machining process is investigated.

남서기류 유입에 의한 호남지방의 집중호우 특성

최기상,박정원,모선진,류찬수 한국기상학회 2005 한국기상학회 학술대회 논문집 Vol.2005 No.-