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Contract-based Access Control Method for NFT Use Rights
Jeong, Yoonsung,Ko, Deokyoon,Seo, Jungwon,Park, Sooyong,Kim, Seong-Jin,Kim, Bum-Soo,Kim, Do-Young 한국컴퓨터정보학회 2022 韓國컴퓨터情報學會論文誌 Vol.27 No.11
In this paper, we propose an NFT(Non-Fungible Token)-based access control method for safely sharing data between users in blockchain environment. Since all data stored in the blockchain can be accessed by anyone due to the nature of the technology, it is necessary to control access except for authorized users when sharing sensitive data. For that, we generate each data as NFT and controls access to the data through the smart contract. In addition, in order to overcome the limitations of single ownership of the existing NFT, we separated the NFT into ownership and use rights, so that data can be safely shared between users. Ownership is represented as an original NFT, use rights is represented as a copied NFT, and all data generated as NFT is encrypted and uploaded, so data can be shared only through the smart contract with access control. To verify this approach, we set up a hypothetical scenario called Building Information Modeling (BIM) data trade, and deployed a smart contract that satisfies 32 function call scenarios that require access control. Also, we evaluated the stability in consideration of the possibility of decryption through brute-force attack. Through our approach, we confirmed that the data can be safely shared between users in blockchain environment.
Mamdani 퍼지추론을 이용한 화살의 탄착점 측정 시스템
유정원(Jungwon Yu),이한수(Hansoo Lee),정영상(Yeongsang Jeong),김성신(Sungshin Kim) 한국지능시스템학회 2012 한국지능시스템학회논문지 Vol.22 No.4
제조공정을 통해 생산된 화살의 성능은 화살의 이동궤적(궁사의 패러독스)과 탄착점의 집적도에 따라 좌우된다. 특히 동일한 환경에서 반복적으로 화살의 슈팅실험을 수행할 경우, 반복실험에서 얻어진 화살의 탄착점 집적도는 화살 성능 평가에서 중요한 객관적 지표가 된다. 그러나 화살의 탄착점에 대한 분석은 현재 상용화된 기술이 부족하며, 기존의 연구들은 화살의 성능에 영향을 미치는 제조공정 변수(화살깃, 화살촉, 화살의 곧기, 중량, 외경, 스파인)만을 최적화하려는 방향으로 기술력이 집중되어 있다. 본 논문에서는 화살의 주요성능지표인 화살의 탄착점 측정 자동화를 위해, Mamdani 퍼지 추론 시스템(Mamdani Fuzzy Inference System)과 도형의 닮음(Similarity of Polygon)을 이용한 화살의 탄착점 측정 시스템을 제안한다. 라인레이저(Line Laser)와 포토다이오드어레이(Photo Diode Array)를 이용하여 고속(약 275㎞/h)으로 이동하는 화살의 탄착점 데이터를 계측하고, 계측된 데이터를 퍼지 추론과 도형의 닮음을 이용하여 화살의 탄착점으로 사상(Mapping) 시킨다. The performance of arrow from a manufacturing process depends on arrow’s trajectory(archer’s paradox) and intensity of an impact points. Especially, when conducting a shooting experiment over and over in the same experiment condition, the intensity of impact point is an objective standard to judge the performance of the arrow. However, the analysis method for the impact point is not enough, a previous research of the arrow"s performance has been focused on a skill to optimize a manufacturing variables(feathers of an arrow, barb of an arrow, arrow"s shaft, weight, external diameter, spine). In this paper, We propose measurement system of arrow’s impact point with Mamdani fuzzy inference system and similarity of polygon for automation of impact point’s measurement. Measuring the impact point data of the arrow moving with a high speed(approximately 275㎞/h) by using line laser and photo diode array, then the measured data are mapped to arrow’s impact point with fuzzy inference and similarity of polygon.
Local Body Stiffness 변화에 따른 조향특성 연구
서정원(Jungwon Seo),노승진(Seungjin Noh),이준희(Junhee Lee),정현욱(Hyunwook Jeong),신상하(Sangha Shin),오정용(Jungyoung Oh) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper aims to explain the steering characteristics by changing local body stiffness. It is well know that body characteristics affect the quality of the dynamics of vehicles, such as handling performance, ride comfort and noise and vibration. This study focuses on the steering performance by changing local body stiffness since the steering characteristics are much affected by local body stiffness. In order to define local body stiffness effect, strut bar and reinforce shock tower are used for objective and subjective evaluation. The on-center handling test was conducted and good correlation was obtained between objective on center handling and subjective evaluation. With the study of on center handling test for local body stiffness, this paper explains the local body stiffness factor for enhancing steering performance.
Dual-Functional Electrocatalyst Derived from Iron-Porphyrin-Encapsulated Metal–Organic Frameworks
Park, Jungwon,Lee, Hyunjoon,Bae, Young Eun,Park, Kyoung Chul,Ji, Hoon,Jeong, Nak Cheon,Lee, Min Hyung,Kwon, Oh Joong,Lee, Chang Yeon American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.34
<P>Active, stable electrocatalysts based on non-precious metals for the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) are critical for the development of cost-effective, efficient renewable energy technologies. Here, Fe/Fe3C-embedded nitrogen-doped carbon was fabricated via pyrolysis of iron-porphyrin-encapsulated mesoporous metal organic frameworks [PCN-333 (Fe), where 'PCN' stands for 'porous coordination network'] at 700 degrees C. The various characterization techniques confirmed that Fe- and Fe3C-containing Fe-N-C material (FeP-P333-700) was successfully prepared by pyrolysis of porphyrin-encapsulated PCN-333 (Fe). FeP-P333-700 exhibited superior electrocatalytic performance for the ORR and HER owing to the synergistic effect of Fe/Fe3C and Fe-N-C active sites.</P>
최정원(Jungwon Choi),임정하(JungHa Lim),정예지(Yejee Jeong) 한국인간발달학회 2024 人間發達硏究 Vol.31 No.1
본 연구의 목적은 아동용 또래 거부민감성 척도(최정원, 2023)의 단축형을 구성하고, 단축형 척도의 심리측정학적 특성을 확인하는 것이다. 이를 위하여 초등학교 5, 6학년 아동 463명을 대상으로 또래 거부민감성과 친구와의 불안정애착, 또래관계문제에 대한 자기보고식 설문자료를 수집하였다. 주요 연구결과는 다음과 같다. 첫째, 탐색적 요인분석 결과 단축형 척도는 총 17문항으로 거부예상, 우울⋅분노, 해석편향, 불안⋅위축의 네 가지 하위요인으로 구성되었다. 둘째, 원척도와 단축형 척도의 상관분석 결과 두 점수의 동질성이 매우 높았다. 셋째, 단축형 척도의 신뢰도는 높게 나타났다. 넷째, 단축형 척도는 CRSQ와 높은 관련성을 보여 준거관련 타당도가 적절하였다. 친구와의 불안정애착 및 또래관계문제 상위 30%집단이 하위 30%집단보다 또래 거부민감성 점수가 높은 것으로 나타나 단축형 척도의 집단비교 타당도를 확인하였다. 또래 거부민감성 단축형 척도는 아동 연구 및 상담현장에서 편리하게 활용될 수 있을 것으로 기대된다. This study aims to develop a short form of the Peer Rejection Sensitivity Questionnaire (PRSQ; Choi, 2023) and assess its psychometric properties. A sample of 463 children in the 5th and 6th grades from elementary schools participated in the study. Self-report data were collected using questionnaires on peer rejection sensitivity, in-secure friendship attachment, and peer relationship problems. Exploratory factor analyses yielded a short form of the PRSQ consisting of 17 items with four factors including re-jection expectation, anger/depression, interpretation bias, and anxiety/withdrawal. Correlation analyses demonstrated strong associations between scores of the original and the short forms. The short form of the PRSQ exhibited high internal consistency and split-half reliability. Furthermore, it displayed appropriate criterion-related validity, with substantial associations with the CRSQ. Children in the top 30 percent of insecure friend-ship attachment and peer relationship problems scored significantly and practically higher on peer rejection sensitivity than those in the bottom 30%, supporting the known-group validity of the short form. The short form of the PRSQ serves as a valuable instrument for measuring peer rejection sensitivity of school-age children within research and counsel-ing settings.
화살의 이동궤적을 위한 하드웨어 구성 및 패러독스 측정
정영상(Yeongsang Jeong),유정원(Jungwon Yu),이한수(Hansoo Lee),김성신(Sungshin Kim) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.3
The point of impact, the shot group, and the flight traces depend on the combination of unique features which decide moving traces of the arrow (paradox of the archer, length of the arrow shaft, weight, angle of the feather, and spline of the arrow shaft). The more dense the impact points in the shot group and the earlier elimination of paradox of the archer, the higher assessment is given for the product. However, there is no way to objectively assess the efficiency and quality of the arrow, and there is no numeric data to be used as the basis for comparison with other products. Although capturing the images of flying arrow using a high-speed motion picture camera is possible, we are limited to observation from specific view angle only. Hence, the criteria for efficiency and quality assessment are mostly based on subjective opinions of experts or hunters, or review on consumers remarks. In this paper, we propose a hardware composition that are based on three detection frames consisting of line lasers and photo diode arrays without the high-speed motion picture camera. Predicated on measured coordinates data, a nobel method for the archers paradox measurement, a key parameter that determine the arrows trajectory, and corresponding numerical analysis model is proposed.