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Effective Software Solutions for 4D Printing: A Review and Proposal
정성욱,조영태,송상은 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.4 No.3
In 4D printing, a target 3D object that can self-transform or self-assemble over time is created using a printer with smart materials. Since the advent of 4D printing, much research has been conducted on smart materials and application of 4D printing in diverse areas. However, research and development of 4D printing software is very limited due to the fact that 4D printing technology is still a novelty. Nevertheless, the time characteristics of 4D printing require appropriate 4D printing software to produce effective 4D printing outputs. In this article, we first introduce 4D printing technology and discuss its application in various fields. Then, we focus on the software required for 4D printing. More specifically, we present six types of software solutions needed to fully support corresponding stages in the 4D printing process: simulation, modeling, slicing, host/firmware, monitoring, and printing management software (PMS), respectively. We discuss how each software solution can sufficiently carry out the designated functions at each stage of the 4D printing process and propose that these software solutions can together provide all of the required operations for 4D printing.
고등학교 생물 2 교과서에서의 용어 표기 형태에 대한 연구
정성욱,신영준 韓國生物敎育學會 2002 생물교육 Vol.30 No.3
This study was conducted focusing on terminology declaration structures in high school biology Ⅱ textbooks. For this research, four kinds' indexes which passed the Ministry of Education's inspections on June, eleventh of 1996 among eleven kinds' Biology Ⅱ textbooks of the sixth education course were analyzed. Mainly terminology declaration structures and their characteristics were researched. All languages are classified as words written in Chinese characters, words of foreign origin, Korean, and symbolic expressions standards. If a term has two or more standards, it is classified as mixed structure. Results on the total of 1,546 categories, the words written in Chinese characters are 1,116 categories which take 72.2% of the entire languages, the words of foreign origin are 137 categories which take 11.2%, Korean is 38 categories which take 2.5%, the symbolic expressions are 19 categories which take 1.2%, and the mixed structures are 200 categories which take 12.9%. The words written in Chinese characters are the most widely used in no matter of Biology Ⅱ textbook's chapters and learning fields. The words of foreign origin were frequently used in unit chosen the term such as enzymes, hormones, and chemical combinations. Korean is frequently used in ecology related documents for animal/plant's names rather than academic terms. The symbolic expressions are categories other than the words written in Chinese characters, the words of foreign origin and Korean, and they are classified with 18 categories. The mixed structures seems to be showing high frequency ranking next to the words written Chinese characters. The reason behind this is complication of terms while converting the words of foreign origin into the words written in Chinese characters and Korean, and the words written in Chinese characters into Korean.
정성욱,유민수 한국정보처리학회 2024 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.13 No.1
기존의 비밀 공유방법들은 무작위적으로 생성된 다항식(polynomial) 또는 평면(plane)으로부터 지분을 유도하기 때문에 복잡하고 긴(complexand long) 형태의 지분을 생성한다. 그렇게 생성된 지분은 암기(not memorizable)가 불가능하고 관리가 어려우며, 이에 따라 지분을 보관하고관리하기 위해 컴퓨터 시스템 또는 별도의 디지털 장치가 있어야 한다. 전통적인 비밀 공유방법을 변형하면 패스워드나 생체정보와 같이 사용자가미리 선택한 값을 지분으로 설정하는 것이 가능할 수 있다. 그러나 이러한 방법은 사용자가 선택한 값의 무작위성(randomness) 또는 엔트로피(entropy)가 낮으면 완전 보안성을 보장하지 못할 수 있다. 즉, (t-1) 개 이하의 지분으로 비밀을 유추해내는 것이 가능해질 수 있다. 본 연구에서는암기가 가능한 패스워드나 지문과 같은 생체정보와 같이 미리 지정된 값을 지분으로 사용하면서 비밀 공유의 보안성을 보장할 수 있는 지분 강화(share hardening) 방법을 제안한다. Conventional secret sharing techniques often derive shares from randomly generated polynomials or planes, resulting in lengthy andcomplex shares that are challenging to memorize and/or manage without the aid of a separate computer or specialized device. Modifyingexisting secret sharing methods to use a predetermined value, such as a memorizable password or bio-metric information, offers a solution. However, this approach raises concerns about security, especially when the predetermined value lacks randomness or has low entropy. In such cases, adversaries may deduce a secret S with just (t - 1) shares by guessing the predetermined value or employing brute forceattacks. In this paper, we introduce a share hardening method designed to ensure the security of secret sharing while enabling the useof memorizable passwords or biometric information as predetermined shares.
나노슬래그와 알칼리 자극제를 활용한 비소성 시멘트 모르타르에 관한 연구
정성욱,임남기 한국건축시공학회 2010 한국건축시공학회지 Vol.10 No.6
As global warming has had harmful effects on the environment, the construction industry has made efforts to reduce the amount of CO2 generated in the process of cement production. There is an urgent need for an alternative material that can replace cement. To improve the initial strength and economical efficiency pointed out as problems,this research was conducted for Blast Furnace Slag (BFS), an industrial byproduct. Non-sintering cement (NSC) was used by minimizing the amount of high-priced alkali activators. By using Nano-technology, fineness has been maximized, to enhance the initial strength of BFS. This research is based on non-sintered cement replaced by nano-slag using alkali activators, and the fundamental properties and quality of the non-sintered cement were investigated. A variety of activators were used, up to 10 percent of the slag weight. This research aims to present fundamental data through a comparative analysis of flexural strength, compressive strength, time of setting, diabetic temperature, and rising heat. 현재 지구촌 온난화에 의하여 환경이 열악해지고 있으며 그에 따라 건설분야에도 시멘트 제조에 따른 CO2발생 저감하기위한 노력을 하고 있다. 이에 시멘트 대체할 재료가 필요하다. 본 연구에서는 기존 비소성 시멘트의 문제점으로 지적 되는경제성 및 초기강도 확보를 위해 산업부산물인 고로슬래그를대상으로 연구를 진행하였으며 고가의 알칼리 자극제량을 최소화함으로서 실용화 가능한 비소성 시멘트 기술을 진행하고자 한다. 그리고 NT를 사용하여 분말도를 최대화 하여 고로슬래그의 초기강도를 개선시켰다. 본 연구는 알칼리 자극제를 사용한 나로슬래그를 치환한 비소성시멘트를 기초로 하고 있으며, 현장에서 사용가능한 비소성시멘트의 기초적 물성 및 품질을 조사하였다. 여러 자극제가 슬래그 중량의 10%로 사용되었으며 휨강도, 압축강도, 응결시간, 단열온도, 상승열등을비교 분석하였으며 그 기초적 자료를 제시하는데 목적이 있다.