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정종윤(Jong-Yun Jung),조형찬(Hyung-Chan Cho),이춘만(Choon-Man Lee) 한국산업경영시스템학회 2007 한국산업경영시스템학회지 Vol.30 No.3
Machining processes produce high accurate metallic parts in metal working industries. Lubrication for machining enhances quality of machined surface and it prolongs the life of cutting tools. Since lubricant is poisonous to human body and environment, it causes occupational diseases for workers and air pollution in environment. Because of these problems generated, developed countries do not permit the excessive usage of lubricant in machining shops. This research focuses on the development of MQL machining technique that consumes minimal amount of lubricant, which reduces possible outbreak of occupational diseases and air pollution. This research sets experimental equipments for MQL machining. Experiments for this study are designed with major machining parameters in MQL. Through the analysis of experiments, this paper presents the optimal machining parameters.
사용자 중심의 시나리오에 기반한 개인화 서비스 합성 및 제공 시스템
정종윤(Jong-yun Jung),류기열(Ki-yeol Ryu),노병희(Byeong-hee Roh) 한국정보과학회 2009 정보과학회 컴퓨팅의 실제 논문지 Vol.15 No.9
유비쿼터스 환경에서 사용자의 상황에 부합하는 서비스를 제공하기 위해 기존의 서비스를 합성 하여 새로운 서비스를 제공하는 방안에 대한 연구가 점점 증가하고 있다. 그러나 다수의 사용자들이 존재하는 서비스 공간에서 사용자에게 개인화된 서비스를 제공하는 것은 매우 어려운 일이다. 본 논문은 사용자 중심의 서비스 시나리오에 기반한 서비스 합성 모델을 제안하고 사용자의 상황에 필요한 서비스를 동적으로 발견하고 결합하여 개인화된 서비스를 제공하는 시스템을 제안한다. 이 시스템은 유비쿼터스 공간에 존재하는 이질적이고 제한된 자원을 가지는 다양한 스마트 객체들로부터 필요한 서비스를 찾기 위한 서비스 발견 프로토콜을 지원한다. 또한 제안된 시스템은 사용자로부터 파생되는 다양한 서비스 시나리오와 정보의 저장소 및 사용자에게 필요한 서비스 실행기로서의 역할을 수행한다. 본 논문에서는 제안한 시스템을 검증하기 위하여 휴대용 단말기를 위한 프로토타입 시스템을 구현한다. To deliver services suitable to user's situation in the ubiquitous environment, the researches on realizing new services by combining existing ones have been continuously increased. But, it is difficult to provide the personalized services to each user located in the ubiquitous service space where multiple users coexist. In this paper, we propose a service composition model based on user-centered service scenarios and a system for providing personalized services through finding services suitable to user's situation and combining them. The proposed system supports a simple service discovery protocol for finding services from heterogeneous smart objects with limited computing power in the ubiquitous environment. The system aggregates and stores various service scenarios and data derived from users and executes the appropriate services for users. We design and implement a prototype system for the mobile personal device.
최대 및 환기역치 운동 시 근테이핑이 LDH 및 Isoenzyme에 미치는 영향
정종윤(Joung Yun Jung),서해근(Hae Geun Seo) 한국사회체육학회 2009 한국사회체육학회지 Vol.0 No.37
The purpose of this study is to investigate how taping attachment influence the change of LDH and isoenzyme in blood after lower limbs taping group, whole body taping group, and control group were respectively divided with 7 members based on the male university students. The results of this study are as follows: While total-LDH, LDH1, and LDH2 respectively decreased in exercise at maximum, LDH3, LDH4, and LDH5 increased in the change of all LDHs. And then all LDHs were, in the post-hoc results, found to have a significant difference in CG and WTG among all groups, and also to have a significant difference right after the exercise as well as at the 30mins of recovery. While total-LDH, LDH1, and LDH2 respectively decreased, LDH4 and LDH5 increased in exercise at ventilation threshold. And then total-LDH, LDH1, LDH4, and LDH5 were, in the post-hoc results, found to have a significant increase in CG and WTG and also to have a significant difference right after the exercise as well as at the 30mins of recovery. As the above conclusion, taping attachment was, in exercise at maximum and ventilation threshold, found to have a positive effect on the improvement of LDH and isoenzyme in blood. Taping is recognized to be ergogenic aids to help the practice of effective exercise and the prevention of injury in sports. help the practice of effective exercise and the prevention of injury in sports.
정종윤 ( Jong Yun Jung ),이동포 ( Dong Po Lee ),김지관 ( Jie Kwan Kim ),박철순 ( Chul Soon Park ) 대한설비관리학회 2012 대한설비관리학회지 Vol.17 No.2
Packing containers for heavy weighted goods are mainly made with wood, which causes a lot of cost to discard them. Wooden box is not suitable for retrieval because of high recycling cost. The material for packing containers is currently being replaced with plastic for retrieval and re-use. This paper presents for design and analysis of a plastic container which is both foldable and multistage type. The container is designed with box form and its details are modeled with CATIA. Once the dimension of the container has been determined, the structural analyses are accomplished to improve the structural safety. This research revised the design for the shape of container through the prototype that is manufactured by injection molding. Through the evaluation in view of structural safety and usability, the dimensions and shapes are slightly changed and modified. After all parts are assembled together in a modeling state, the container is analyzed to prove mechanical safety.
정종윤 ( Jong-yun Jung ),김준섭 ( Joon-seob Kim ) 대한설비관리학회 2020 대한설비관리학회지 Vol.25 No.4
Process driving turbines have been used for a long time in high-temperature and high-pressure environments and are placed in poor environmental conditions, so the stability of the design to prevent deformation or damage is very important. The retainer, which is a core part of the turbine, rotates under steam pressure of high temperature and high pressure, so safety against deformation and damage due to vibration must be ensured. Therefore, safety verification after design is an essential process in turbine design. The purpose of this study is to verify the stability of the process retainer design by finite element analysis. There may be several methods for verifying the stability of a machine, but as machine parts become more complex and diversified, the finite element method is increasingly used. For stability verification, after verifying the deformation and damage of the part by static analysis, the possibility of fatigue failure was checked through the fatigue safety factor and fatigue life through fatigue analysis. In order to verify the safety of the rotating retainer, the possibility of occurrence of resonance according to the natural frequency was confirmed, and total deformation was confirmed through a harmonic response. Through this series of processes, it was verified that the designed retainer, the subject of this research, is safe.
소비자의 소셜미디어 활동이 지각된 유용성을 통해 소비자 태도에 미치는 영향: 화장품을 중심으로
정종윤(JongYoon Jung),현병환(ByungHwan Hyun) 한국인터넷전자상거래학회 2021 인터넷전자상거래연구 Vol.21 No.1
This study aims to explore whether perceptible usability mediates between consumer’s social media activity and consumer attitude. Social media activity was specifically operationalized as the amount of information, reliability of information and information quality, each of which served as an independent variable. In order to conduct the study, self-report questionnaires were administered to a total of 308 participants. Several statistical techniques were applied such as descriptive statistics, pearson’s correlation and mediation analysis to analyze the data. The results from the study are as follows. First, perceptible usability partially mediated between the amount of information and consumer attitude. Second, perceptible usability also partially mediated between reliability of information and consumer’s attitude. Lastly, perceptible usability fully mediated between information quality and consumer’s attitude. The study provides several implications for marketers in the field of cosmetics.