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조종성능을 고려한 파랑 중 선박의 직진성능에 관한 연구
강동훈,이순섭,이승재,Kang, Dong-Hoon,Lee, Soon-Sup,Lee, Seung-Jae 해양환경안전학회 2013 해양환경안전학회지 Vol.19 No.2
파랑 중 선박의 직진성능을 시뮬레이션을 통하여 비교 검토하였다. 시뮬레이션을 구성하기위해 선박의 3자유도 조종운동방정식을 사용했으며, 선박에 가해지는 파랑강제력은 3차원 특이점 분포법을 사용하여 계산하였다. 시뮬레이션의 외란으로서 규칙파와 불규칙파를 사용하였고 최대사용타각과 제어시간지연을 제어기의 제한조건으로 설정하였다. 조종성능에 따른 직진성능을 검토하기 위해 유체력 미계수를 인위적으로 변화시킴으로서 조종성능이 다른 선박의 시뮬레이션을 구성하였다. Autopilot제어기를 사용한 일정시간의 선박의 직진 시뮬레이션을 수행하고 해당시간동안의 직진거리를 비교하여 선박의 직진성능을 검토하였다. Course keeping ability of ships under wave are analyzed with wave. The simulation with three degrees of freedom is developed and 3-D source distribution method is applied to get wave force for the simulation. The simulation is conducted with the restriction of maximum rudder angle and time delay of control and regular wave and irregular wave are considered as the source of external forces. Simulations with ships which have different maneuverability with tuned hydrodynamic coefficients are developed to assess the variation of the course keeping ability depending on the ship's maneuvering characteristics. The course Keeping ability is evaluated by comparison of distance while the ships are simulated with autopilot control.
고밀도 폴리에틸렌 섬유의 가닥수에 따른 크리프 특성 및 예측
강동훈,최재호,장기혁,홍충희,박원호,Kang, Dong Hoon,Choi, Jae Ho,Jang, Ki Hyuk,Hong, Choong Hee,Park, Won Ho 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.2
igh-density polyethylene (HDPE) is widely used in industrial applications due to its versatility and chemical resistance. Lately, its versatility has been further expanded by surface cross-linking and modification. Also, reduction in the weight of polyethylene is one of the most important requirements in the industry. Creep test is a common method for studying the behavior of materials over a long period of time to design their industrial applications. Since a conventional creep test requires more than a test time of 10,000 h, a relatively short-time creep behavior can be predicted using time-temperature superposition (TTS) or mathematical modeling. The long-term creep behavior can be predicted by mathematical modeling using the short-term creep data. In this study, the creep behavior of HDPE fibers was measured in the load range of 20-50% of the ultimate tensile strength (UTS), and compared in terms of the number of filaments and denier. The long-term creep behavior was successfully predicted using the short-term creep behavior data obtained by mathematical modeling. Therefore, this approach can be used to predict the number and denier of PE fibers in industrial applications.
손 글쓰기와 컴퓨터 글쓰기에 관한 초등학생 筆者의 選好度 및 認識 分析
강동훈(姜東薰) ( Kang Dong-hoon ) 한국어문교육연구회 2024 어문연구(語文硏究) Vol.52 No.1
이 연구의 목적은 ‘손 글쓰기’와 ‘컴퓨터 글쓰기’에 관한 초등학생 필자들의 선호도와 인식을 분석하는 데 있다. 선호도 분석 결과, 손 글쓰기를 더 선호하였고, 성별 간 유의미한 차이는 없었다. 인식 분석 결과, 손 글쓰기의 ①도구에 관심을 두며, ②철자법, 정서법에 많은 관심을 기울이고, ③힘들고 귀찮지만, 편하고 멋있다고 인식하였다. 컴퓨터 글쓰기의 ①도구에 많은 관심을 보였고, ②타이핑 기능에 많은 영향을 받았으며, ③매체와의 통합적 활용에 관심이 높았다. 각 방식의 선호·기피 이유 분석 결과, 손 글쓰기는 감성이 좋고 정성이 느껴지는 등의 이유로 선호했지만, 글씨체가 예쁘지 않다는 이유 등으로 선호하지 않았다. 컴퓨터 글쓰기는 쉽게 수정할 수 있어서 선호했지만, 타이핑 기능의 부족과 불편함 등의 이유로 선호하지 않았다. 쓰기 교육의 장면에서 필자의 특성을 충분히 고려하여 수행방식을 선정하고, 특성을 고려하여 쓰기 환경을 조성함으로써 학생들의 쓰기 능력 향상을 적극적으로 지원해야 할 것이다. This study aims to analyze elementary students' preferences and perceptions regarding two writing methods: 'handwriting' and 'computer writing.' The findings are as follows: In preference analysis, handwriting was more favored by elementary school writers, with no significant differences in preference observed between genders. Perception analysis revealed that in handwriting, there was ① an interest in the tools used, ② considerable attention given to spelling and emotive expression, and ③ it was perceived as challenging and bothersome, yet comfortable and stylish. In contrast, for computer writing, there was ① a significant interest in the tools used, ② substantial influence from typing skills, and ③ high interest in the integrated use of the medium. The analysis of the reasons for preferring or avoiding each method showed that handwriting was preferred for its emotional touch and sense of sincerity but was not favored due to reasons like unattractive handwriting style. Conversely, computer writing was favored for its ease of editing, but not preferred due to insufficient typing skills and inconvenience. In writing education, it is crucial to select the method of execution by thoroughly considering the writer's characteristics. Additionally, creating a writing environment that takes these characteristics into account is vital to actively support the enhancement of students' writing skills.
강동훈(Dong-Hoon Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Load cell is one of the most fundamental measuring instruments in many application fields. Generally, common load cells are based on the demodulation principle using electric strain gages (ESGs). However, many electric sensors including ESGs are easily influenced by electro-magnetic interference (EMI), which causes measurement errors. For the reason, the necessity of load cells that are immune to EMI is gradually increasing. Fiber optic sensors, especially fiber Bragg grating (FBG) sensors are widely used for various applications because of good multiplexing capabilities and also have many advantages such as wide temperature ranges, small size and immunity to EMI. In this paper, one-axis load cell is manufactured using FBG sensors and verified through a tensile test on a universal testing machine. From the experimental results, it was successfully demonstrated that FBG sensors can be a good counterproposal for sensing elements of load cells.
폐기되는 이차전지 내 열화된 LiCoO₂ 양극소재 성능 회복을 위한 재생공정 연구
강동훈(Donghun Kang),진홍수(Hongsu Jin),고민성(Minseong Ko) 한국전지학회 2022 한국전지학회지 Vol.2 No.1
리튬이온 배터리에 대한 수요가 증가함에 따라 폐기되는 리튬 이온 배터리의 수도 증가하고 있으며, 리튬 이온 배터리의 재활용에 대한 관심이 높아지고 있습니다. 기존의 재활용 공정은 강산을 사용하거나 고온에서 열처리하는 과정에서 폐기물이 발생하는 문제가 있어 이를 대체하기 위한 다양한 연구가 진행되고 있습니다. 본 논문에서는 폐 리튬이온 전지에서 열화된 LiCoO₂를 분리하고 간단한 소성 열처리를 통해 성능을 회복함으로써 폐기물 발생 문제를 해결하고자 하였습니다. As the demand for Li-ion batteries increases, so does the number of Li-ion batteries that are discarded, and there is growing interest in recycling Li-ion batteries. The existing recycling process has a problem of waste generation in the process of using a strong acid or heat treating at a high temperature, and various studies are being conducted to replace this. In this paper, we tried to solve the problem of waste generation by separating the deteriorated LiCoO₂ material from the waste Li-ion battery and regenerating through the simple calcination it to recover the performance.
철도차량용 발열시트 제작을 위한 필름형 발열체 발열 성능 평가
강동훈(Donghoon Kang),박주엽(Juyeop Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In recent years, the application of heated seats has been gradually increasing in railway vehicles to improve passenger convenience. However, in the case of hot wire methods, energy efficiency is low, and there is a risk of fire owing to the corrosion of pyrogen during extended use. Thus, the application of surface heating technology, which is energy-efficient and favorable for face-to-face structures, is gradually expanding. This study assesses the applicability of film-type surface exothermic materials to the manufacture of heating sheets for railway vehicles. The exothermic film is applied to the rear of the plastic sheet used in urban railway vehicles, and the heating performance is quantitatively evaluated based on the applied voltage. The test results confirm that the exothermic film can be a good candidate for heating sheets with excellent heating performance and uniformity.
여성의 벨리댄스 참여정도가 신체상과 정서에 미치는 영향
강동훈(Kang Dong-Hoon),박주영(Park Joo-Young) 한국체육과학회 2009 한국체육과학회지 Vol.18 No.1
The purpose of this study was to examine the effects of the degree of participation of bellydance on body-image and emotion in women. The subject for this study consisted of resident of Seoul and Incheon area over 20 years age which were a total of 223 using stratified random cluster sampling. This study analyzed reliability analysis, frequency analysis, description analysis, correlation analysis and multiple regression analysis by SPSS 12.0 version. From the analysis of this study, the following conclusions were obtained: Firstly, the frequency of participation showed meaningful differences in relation to age, education, subjective state of health and marriage. Secondly, the effects of the degree of participation of bellydance were influenced on body-image in women. Thirdly, the effects of the degree of participation of bellydance were influenced on emotion in women.