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PLA 트레이 포장 수출용 배의 수송 모의환경 진동 스트레스에 의한 품질변화
최동수,손재용,김진세,김용훈,박천완,황성욱,박종민,정현모,Choi, Dong-Soo,Son, Jae-Yong,Kim, Jin-Se,Kim, Yong-Hoon,Park, Chun-Wan,Hwang, Sung-Wook,Park, Jong-Min,Jung, Hyun-Mo 한국포장학회 2021 한국포장학회지 Vol.27 No.2
The characteristics of vibrational stress (shock and vibration) during transport and the possibility of damage to the packaged pears by functional PLA tray were investigated. And this study was conducted to analyze how environmental conditions by simulated transport environment affect quality factors such as weight loss (%) and soluble solid content (SSC, %), and firmness (bioyield strength, kPa) of packaged pears by PLA tray and Expanded PET foam pad (Group 1), EPE cushion cup pad and net (Group 2) for exporting. Pears with or without vibration stress were stored for 30 days at low temperatures (5 ± 0.8℃, 80 ± 5% relative humidity). There was the statistically significant difference (p ≤ 0.05) between pears with and without vibration stress for weight loss, soluble solid content, and firmness (bioyield strength) after 30 days storage. Vibration stress accelerated pear quality deterioration during storage, resulting in increased weight loss, soluble solids content, and reduced hardness. The firmness (bioyield strength) and weight changes of pears with PLA trays were smaller than those of conventional packaging box systems. It was determined that the firmness of agricultural products was a quality factor closely related to the storage period and that PLA could be applied.
규사의 (硅砂) 입도에 (粒度) 따른 주물사의 (鑄物砂) 상온성질 (常溫性質) 관한 연구
최동수,이계완 ( Dong Soo Choi,Kye Won Lee ) 한국주조공학회 1983 한국주조공학회지 Vol.3 No.3
The effect of sand grain size on the various properties of mold is not only basic but important interest which we have to deal with. And the relation among the various properties of mold (strength, permeability, flowability, compactability, hardness, deformation, toughness etc.) is very complicated and inaccurate, so we can delineate the behavior of mixture (sand + water + bentonite) with experience only. Within recent years a so-colled rigid-water theory has been accepted as a means of advancing logical explanations for the research aimed at delineating sand-clay-water relationships. By changing grain size or mesh no. of grain, specimens have been subjected to green compressive strength, permeability, deformation, flowability, compactablity, toughness at room temperature. Under constant mulling energy and ratio of water/bentonite, the results obtained were as follows: 1. With decreasing grain size green compressive strength of the specimen increased. 2. With decreasing grain size permeability decreased. 3. With decreasing grain size flowability and bulk density decreased but compactability increased. 4. With decreasing grain size deformation decreased but toughness increased. 5. At 60 mesh no., the properties of specimen are conspicuously changed. The reason is that the total surface area of sand grain which affects the type of bonding between sand grains is more changed at 60 mesh number.
최동수(Dong-Soo Choi),전경진(Kyeong-Jin Jeon),한상혁(Sang-Hyuk Han),김주리(Joo-Ry Kim),김상연(Sang-Youn Kim) 한국HCI학회 2012 한국HCI학회 학술대회 Vol.2012 No.1
본 논문에서는 사용자가 말을 타고 총을 쏘는 몰입형 서부 슈팅 게임을 제안한다. 게임과 자연스러운 상호작용을 위해 사용자의 움직임을 파악한다. 또한 실린더, 솔레노이드 밸브 그리고 DC 모터를 사용하여 말의 움직임을 재현한다. 제안하는 게임이 현실감을 제공하는 지에 대한 실험을 진행 한다. 실험의 결과로 제안하는 시스템이 일반적인 게임 환경 보다 현실감을 제공 하는 것을 보여 준다. This paper presents an immersive western shooting game where a user rides a horse and shoot a rifle. In the proposed game, we measure the user's motion and use it for natural interaction with virtual objects. To simulate the behavior of horse riding, we create the horse's motion with cylinders, solenoid valve, and electric motors. We conduct a experiment in order to investigate whether the proposed game provides a sense of reality. The experimental result shows that the sense of reality of the proposed game platform is better than that of the conventional game platform.
태양광 에너지 최대전력 추적 제어 알고리즘과 고효율 변환기 구현
최동수(Dong-Soo Choi),홍정표(Jeng-Pyo Hong) 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.1
In this paper, on the basic output-character for power generation of the PV(photovoltaic) module, the control algorithm for maximum power point tracking(MPPT) are proposed by utilizing a boost converter with MOSFET switch to keep a constant output voltage. MPPT is easily implemented by controling the boost converter with detected current and voltage of PV module. The serial-parallel resonant dc/dc converter for generating small power loss, is design to boost a 320DCV to 24V. A single phase inverter is controled by current tracking with four IGBTs switch in full bridge. Furthermore, solar energy conversion has a low cost by using the DSP control. The effectiveness of the proposed conversion system for a PV energy is confirmed experimentally and by means of simulation. Finally. experimental results confirm the superior performance of the proposed algorithm.
최동수(Dong-Soo Choi),홍정표(Jeng-Pyo Hong),이상훈(Sang-Hoon Lee) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.5
This paper describes a scheme and the hybrid control together mobile/tension with two task, for the installation of a stringing electric cable. The installation system consists of three parts: a mobile system based on a dc motor equation, a tension system based on an equation of an ac servomotor and electric wire cable, and a hole control part with of acceleration feedforward to suppress the mutual interference of the two task. The proposed model for installation of a stringing electric cable is simulated and tested experimentally. In result, the hybrid control of mobile/tension is discussed as the response show up an effect for suppressing in mutual interface of two tasks and, its utility is verified.
항공 기내서비스 프로세스별 고객경험, 지각된 고객지향성, 고객만족 간의 구조적 영향 관계 연구
최동수 ( Choi Dong-soo ),강현나 ( Kang Hyeon-na ),서원석 ( Seo Won-seok ) 한국고객만족경영학회 2021 고객만족경영연구 Vol.23 No.1
본 연구는 항공 기내서비스 접점에서의 고객경험, 고객이 지각한 고객지향성, 그리고 고객만족 간의 구조적 영향 관계를 연구하고자 2020년 9월에 진행되었다. 기내서비스 접점을 구체적으로 분석하고자 서비스 청사진과 서비스 프로세스를 통합적으로 고찰해 이륙 전→운항 중→착륙의 순서로 구성하여 항공 기내서비스 프로세스를 개념화하였다. 이성적·감성적·관계적 경험요인으로 구성된 고객경험 역시 항공 기내서비스 프로세스에서 고객이 경험할 수 있는 내용으로 구성하였다. 연구 분석은 항공기 탑승경험이 있는 고객을 대상으로 온라인에서 배포 및 회수한 최초 271부 중 응답 불성실 등을 제외한 255부를 최종 통계분석에 활용하였다. 가설검증을 위한 통계분석은 구조방정식으로 진행하였다. 연구결과는 다음과 같다. 첫째, 기내서비스 프로세스인 ‘이륙 전→운항 중→착륙’의 모든 과정에서 각 프로세스의 관계적 경험만이 지각된 고객지향성에 정(+)의 영향을 주는 것으로 밝혀졌으며, 구체적으로 착륙, 이륙 전, 운항 중의 순으로 관계적 경험이 지각된 고객지향성에 영향을 미쳤다. 둘째, 지각된 고객지향성은 고객만족에 정(+)의 영향을 주는 것으로 밝혀졌으며, 이는 ‘이륙 전→운항 중→착륙’의 모든 과정에서 유의성이 입증되었다. 구체적으로 운항 중, 착륙, 이륙 전의 순으로 유의미한 영향 관계를 보였다. 연구결과와 더불어 기내서비스 프로세스별로 고객경험 및 지각된 고객지향성의 구성 요인의 구조모형을 고찰하고 해석해 그 결과를 논함으로써 고객만족 및 항공서비스 분야의 학술적 및 실무적 시사점을 제공하였다. This study was conducted in September 2020 to study the structural impact relationship among customer experience at the in-flight service encounter, customer orientation perceived by customer, and customer satisfaction. in order to specifically analyze the in-flight service encounter, the service blueprint and service process were referred to, and the in-flight service process was conceptualized as 'before take-off→during-flight→landing'. the customer experience, which consists of rational, emotional, and relational experience factors, also consists of what customers can experience in the airline in-flight service process. the research analysis utilized 255 of the first 271 copies distributed and retrieved online for customers with experience in boarding aircraft, excluding unfaithful responses, for the final statistical analysis. statistical analysis for hypothesis verification was carried out in a SEM(Structural Equation Modeling). The results of the study are as follows. first, only relational experiences of each process were found to have a significant impact on perceived customer orientation in all processes of the in-flight service process. specifically relational experiences influenced customer satisfaction in the order of 'during-flight', 'landing', ‘before take-off'. second, perceived customer orientation was found to have a significant impact on customer satisfaction, which proved significant in all processes of 'before take-off→during-flight→landing'. specifically, perceived customer orientation showed significant impact relationships in the order of ‘during-flight’, ‘landing’, ‘before take-off’. In addition to the research results, the Structural Equation Model(SEM)’s components of customer experience and perceived customer orientation by in-flight service process was considered and interpreted. the results were discussed to provide academic and practical implications in the field of customer satisfaction and airline services.