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나노 탄소 필라멘트 기반 3D 프린팅 압저항 센서 개발 연구
오광원,최백규,김성용,문현우,조정훈,김광희,김병탁,강인필 대한기계학회 2023 大韓機械學會論文集A Vol.47 No.8
In this paper, we experimentally studied the characteristics of 3D printed sensors made from nano-carbon piezoresistive filament (NCPF). Using the piezoresistivity of NCPF made from ABS resin and 2 wt% multi-walled carbon nanotubes (MWCNT), we fabricated strain and torque sensors using a 3D printer. The strain sensor with a grid pattern showed a linearity of 13% over a range of 0.12% tensile and compressive strains but also exhibited hysteresis characteristics commonly found in polymer-based sensors. The torque sensor with a spoke shape showed lower sensitivity (0.06 V/N·m) than metal strain gauges but demonstrated similar linearity. 본 논문에서는 나노 탄소 압저항 필라멘트(NCPF: nano-carbon piezoresistive filament)로 제작된 3D 프린팅 센서의 특성을 실험 연구하였다. ABS 수지와 2 wt%의 다중벽 탄소 나노튜브로 제작된 NCPF 의 압저항 특성을 기반으로, 3D 프린터를 활용하여 스트레인 센서와 토크 센서를 제작하였다. 그리드 패턴의 스트레인 센서는 0.12% 범위의 인장과 압축에 대하여 13%의 선형성을 보였으나, 고분자를 기반으로 하는 센서에서 발생하는 히스테리시스 특성도 함께 나타났다. 스포크(spoke) 형상의 토크 센서는 금속 스트레인 게이지 보다는 낮은 감도(0.06 V/N·m) 특성을 보였으나 선형성 측면에서 유사한 특성을 보였다.
SALE OF RESIDENTIAL HOUSES IN VIETNAM
오광원 동아대학교 법학연구소 2015 國際去來와 法 Vol.- No.13
The positive prospect of Vietnam residential house market is attracting foreign direct investment especially to Hanoi and HCMC's real estate market. However, the law and regulations related to the real estate business has many kinds of typical aspects because of the characteristic of the socialist system of Vietnam. In addition, the new Residential Housing Law and new Real Estate Law adopted many kinds of new requirements for the real estate developer to protect residential house buyers. Thus the investors in the area of real estate need to focus on the legal elements required by the Vietnamese law and related regulations. This article only reviewed the sales period in the residential house development project such as Deposit Agreement, Capital Contribution Contract, requirements for the Sale and Purchase of houses and issuance of Land Use Right Certificate. Thus before starting the residential housing investment in Vietnam, the foreign company also needs to review the first stage of investment such as obtaining Investment License, permission for the construction together with the second stage such as the compensation for the land and the attached assets, clearance of the land and so on. The investor also needs to consider the difficulties in clarifying the requirements for the real estate business because the law and regulations are not clear and the ruling of courts have not been opened to the public in Vietnam. In addition, it is difficult to find a appropriate textbook or thesis clearly explaining the law and regulations related to the real estate business in Vietnam. Lastly I want to add that it is difficult to contact officials of Ministry of Construction and Department of Construction to get the answers for the vague parts of real estate areas. In conclusion, to secure success of investment in Vietnamese real estate business market, the investor needs to carefully review the law and regulations, consider the unclear requirements in the law and consult the real estate business law specialists to get their experience together with the principles in law.