• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.552-555
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• 2018

본 논문에서는 키넥트 센서를 이용한 제스처 인식 방법을 개발하고, 이를 이용한 격투액션 제어 인터페이스를 제안한다. 제스처의 패턴 특징을 추출하기 위해서는 단순한 절대 위치 정보를 이용하는 것이 아닌, 어깨를 중심으로 한 신체 비율 특성을 고려하여 특징을 추출하는 방법을 이용한다. 하지만 동일한 제스처를 수행하더라도 키넥트 센서에 포착되는 각 관절의 위치 좌표값들은 팔의 길이와 방향에 따라 달라질 수 있다는 문제점이 있다. 그래서 논문에서는 제스처를 모델링하고 분석하기 위해 주성분 분석법을 사용하는 방법을 기술한다. 이 방법을 사용함으로서 데이터가 가지는 에러의 영향을 줄일 수 있게 되고, 차원축약의 효과를 얻을 수 있게 된다. 또한 동작 인식 시스템의 동작 제약을 줄이기 위한 방법으로 수정된 매칭 알고리즘을 제안한다.

• 사물인터넷융복합논문지
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• 제7권3호
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• pp.75-80
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• 2021

NOx의 배출저감 방법으로 선박용 디젤엔진의 최적화만으로는 배기가스의 NOx 배출량 제한을 만족시킬 수 없기 때문에 반드시 배기가스를 후처리하여 NOx를 저감할 수 있는 방안이 요구된다. 본 연구에서는 현재 개발 중에 있는 선박용 SCR 촉매 유닛 일체형 덕트용 오일 버너 시스템에서 요소수를 NH3로 효과적으로 변환하기 위한 이류체 노즐과 믹싱 챔버 덕트에 관한 설계 타당성 여부를 속도분포 및 온도분포에 대한 전산열유동 해석을 통해 검토하고자 한다.

• 실천공학교육논문지
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• 제10권2호
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• pp.125-129
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• 2018

이 논문은 LTP 퍼니스의 최적화 된 내부 유동과 온도의 균일성에 대한 수치 해석에 관한 것이다. 반도체 제조 공정에서 실리콘 웨이퍼를 어닐링하기 위한 기능을 수행한다. 특히 챔버 내부의 최고 온도를 약 $400^{\circ}C$의 고온으로 유지하여 웨이퍼를 보강한다. 공정이 고온에서 완료되면 열 교환기를 통해 온도를 낮추고 이를 수행하기 위한 작업이 반복된다. 이 논문에서 최종적인 목표는 LTPS 퍼니스의 유동 해석을 통해 챔버의 단열 공급과 배기 구조의 최적 설계를 도출하는 것과 교육과정 개발을 위한 사례 발굴에 있다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 춘계학술대회
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• pp.504-506
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• 2022

기존의 루프탑 태양광 발전 시스템들은 안전성 문제와 더불어 시스템상의 오류 때문에 주로 고정형 시스템 개발 초점이 맞추어져 있었다. 이에 기존 고정식 루프탑 태양광 발전 기술에 태양광 추적 시스템과 모니터링 시스템을 추가하여 루프탑 설치형 스마트 태양광 발전 시스템을 개발하고자 한다. 이는 태양광 추적시스템 접목, 안전진단 및 대처시스템 접목, 이상진단 및 알람 시스템 접목, 외부기기 제어 및 모니터링 시스템 접목으로 "루프탑 설치형 스마트 태양광 발전시스템" 개발 및 사업화에 활용 계획이다.

• 동력기계공학회지
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• 제16권3호
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• pp.51-56
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• 2012

The effect of deformation induced martensite transformation on the mechanical properties in austenitic stainless steel with high Mn was studied. ${\alpha}$'-martensite was formed by deformation in austenitic stainless steel with high Mn. Deformation induced ${\alpha}$'-martensite was formed with surface relief by cold rolling. With the increase of deformation degree, volume fraction of deformation induced martensite was increased rapidly in early stage of deformation and then, increased slowly. With the increase of deformation degree, hardness and tensile strength were rapidly increased with linear relations, while elongation was rapidly decreased and then slowly decreased. Hardness, tensile strengths and elongation were influenced strongly by deformation induced martensite.

• 한국기계가공학회지
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• 제14권6호
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• pp.111-121
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• 2015

The objective of this study is to develop an automatic object changer unit to improve changing process problems existing in the conventional horizontal machining center. In order to perform this objective, an upward and downward traverse unit was designed. This unit consists of a motor, reducer, chain and sprocket wheel, and an upper and lower base. This automatic object changer unit performs a sliding contact motion in a purpose built and designed frame. Constraint conditions for the upward and downward traverse unit were first designed. Then, an operation mechanism was designed and introduced as the sum of the kinetic energy for the sprocket wheel and the upper and lower base and which was based on the moment of inertia, which is the kinetic energy of the converted upward and downward traverse unit in the side of the reducer. The paper covers the design of th e Automatic Pallet Changer for th e machining center.

• 센서학회지
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• 제27권2호
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• pp.99-104
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• 2018

A micro electromagnetic actuator with high vibration efficiency is proposed for use in an implantable hearing device. The actuator, which can be implanted in the middle ear, consists of membranes based on the stainless steel 304 (SUS-304), and other components. In conventional actuators, in which a thick membrane and a silicone elastomer are used, the size reduction was difficult. In order to miniaturize the size of the actuator, it is necessary to reduce the size of the actuation potion that generates the driving force, resulting in reduction of the electromagnetic force. In this paper, the electromagnetic actuator is further miniaturized by the metal membrane and the vibration amplitude is also optimized. The actuator designed according to the simulation results was fabricated by using micro-electro-mechanical systems (MEMS) technology. In particular, a $20{\mu}m$ thick metal membrane was fabricated using the erosion process, which reduced the length of the actuator by more than $400{\mu}m$. In the experiments, the vibration displacement characteristics of the optimized actuator were above 400 nm within the range of 0.1 to 1 kHz when a current of $1mA_{rms}$ was applied to the coil.

• 센서학회지
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• 제27권5호
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• pp.352-356
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• 2018

This paper relates to a technology for monitoring a liquefied gas storage tank in the special gas field where demand is increasing owing to the continuous growth of related fields such as the semiconductor, display, and ICT convergence electronics industries. We have proposed a system for real - time monitoring using wireless sensor network technology, and implemented a system consisting of a sensor unit, transmitter module, and receiver module to be attached to a liquefied gas storage tank. The system was applied to LCO2 tanks among various liquefied gas storage tanks to verify the feasibility. The storage tanks employed in the experiments has capacities of 16,179 l and was 1,920 mm in inner diameter. Furthermore, the density was 1.03 g/l. The measured data were compared with reference data on the remaining gas level versus the $CO_2$ height of the surface, expressed using a conventional water meter, provided by an existing storage tank supplier. The experimental results show that the data is similar to the standard data provided by the tank supplier, and has a high accuracy and reliability within an error range of 0.03%.

• 한국기계가공학회지
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• 제19권4호
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• pp.71-78
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• 2020

The rotary feed axes of a 5-axis machine tool can increase the freedom of the tool posture, while reducing feed speed and rigidity. In addition, as a ball-end mill is inevitably used during machining by rotational feed, the step-over length is reduced compared to the flat-end mill, thereby reducing the material removal rate. Therefore, this study attempts to improve the material removal rate, feed speed, and machining stability using the corner radius flat-end mill and a fixed controlled machining method for the rotary feed axes during roughing. In addition, the tapered ball-end mill and simultaneously controlled machining method for the rotary feed axes were used for finishing to improve the propeller's 5-axis machining efficiency by enhancing the surface quality. In order to create the tool path effectively and easily, we propose a specific approach for using the propeller's geometric properties and evaluate the effectiveness of the proposed method by comparing it with the method of the dedicated module.

• 한국기계가공학회지
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• 제19권3호
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• pp.63-70
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• 2020

Two rotational motions of the 5-axis machine tool maximize the degree of freedom of the tool axis vector, which improves tool accessibility; however, this lowers feed speed and rigidity, which impairs machining stability. In addition, cutting efficiency is lowered when compared with a flat end mill because typically, the ball-end mill is used when machining by rotational motion. This study increased cutting efficiency by using a corner radius flat end mill during impeller roughing. Furthermore, we proposed a fixed controlled machining of the rotary motion using geometric shape information to improve the feed speed and machining stability. Finally, we proposed a finishing tool path generation method using a vector net to increase the convenience and practicality of tool path generation. To verify its effectiveness, we compared the machining time, shape accuracy, and surface quality of the proposed method and an existing dedicated module.