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주파수 조정에 따른 에너지 하베스팅용 압전 캔틸레버의 특성
김형찬,송현철,정대용,김현재,윤석진,주병권,Kim, Hyung-Chan,Song, Hyun-Cheol,Jeong, Dae-Yong,Kim, Hyun-Jai,Yoon, Seok-Jin,Ju, Byeong-Kwon 한국재료학회 2007 한국재료학회지 Vol.17 No.12
Piezoelectric energy harvesting from our surrounding vibration has been studied for driving the wireless sensor node. To change the vibration energy into the electric-energy efficiently, the natural frequency of cantilever needs to be adjusted to that of a vibration source. When adding 6.80g mass on the end of the fabricated cantilever, a natural frequency shifts from 136 Hz into 49.5 Hz. In addition, electro-mechanical coupling factor increased from 10.20% to 11.90% and resulted in the 1.18 times increase of maximum output power.
에너지 하베스팅용 압전 캔틸레버의 위치에 따른 파단점 분석
김형찬,정대용,윤석진,김현재,Kim, Hyung-Chan,Jeong, Dae-Yong,Yoon, Seok-Jin,Kim, Hyun-Jai 한국재료학회 2007 한국재료학회지 Vol.17 No.2
Energy harvesting from the vibration through the piezoelectric effect has been studied for powering the wireless sensor node. As piezoelectric unimorph cantilever structure can transfer low vibration to large displacement, this structure was commonly deployed to harvest electric energy from vibrations. Piezoelectric unimorph structure was composed of small stiff piezoelectric ceramic on the large flexible substrate. As there is the large Young's modulus difference between the flexible substrate and stiff piezoelectric ceramic, flexible substrate could not homogeneously transfer the vibration to stiff piezoelectric ceramic. As a result, most piezoelectric ceramics had been broken at the certain point. We measured and analyzed the stress distribution on the piezoelectric ceramic on the cantilever.
김형찬 ( Hyung Chan Kim ),이상원 ( Sang Won Lee ),권종준 ( Jong Jun Kwon ),최성열 ( Sung Youl Choi ),김대현 ( Dae Hyun Kim ),김지훤 ( Ji Hwon Kim ),김태헌 ( Tae Heon Kim ),류영수 ( Yeoun Su Lyu ),강형원 ( Hyung Won Kang ) 대한한방신경정신과학회 2007 동의신경정신과학회지 Vol.18 No.1
Objective : This Study is attempted to compare respiration training method on Sun-Do Training it is quadrivalence. Method : We used all books and paper, journal of inside and outside of the country on Sun-Do Training. Results and Conclusions: 1. Respiration training method on Mu-Eou-Do is spontaneous breathing, breath follows in individual`s respiratory. 2. Respiration training method on Suk-Mun, Guk-Seon-Do, Dan-Hak is all of the position differ, but all considers and breathes naturally abdominal region named Dan-Jeoun, the hypogastric center (丹田). 3. Respiration training method that intend in Guk-seon-do should be soft and slow and long and deep and the moment must not be stoppage. 4. Difference of respiration training method is that region that mean at practice differs. Suk-Mun and Guk-Seon-Do have respiration training method that do with anus as is special in practice process. Dan-Hak thinks that breath has entered as Myung-Mun(命門), means fundamental force.
정전기력 분무 공정 기반 마스크 패터닝 시스템 기술 개발
최경현(Kyung-Hyun Choi),당현우(Hyun-Woo Dang),김형찬(Hyung-Chan Kim),고정범(Jeong-Beom Ko),도양회(Yang-Hoe Doh),김동수(Dong-Soo Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
An environmental-friendly spray deposition is different from commercially available deposition techniques like piezo, thermal, and aerosol. Through electrostatically controlled conductive inks, patterns can be achieved on substrate by using submicron mask. In this study a novel process of selective patterning is implemented. This paper discusses an optimized system design for analysis of process variables by electro pray deposition. Colloidal solution contained in a metallic capillary head driven by electrostatic force verified mask patterning experimentally.
외상성 저안압황반병증 환자에서 유리체강내 공기주입술로 치료한 1예
박병준,신현진,김형찬,Byeong Jun Park,Hyun Jin Shin,Hyung Chan Kim 대한안과학회 2013 대한안과학회지 Vol.54 No.12
Purpose: To report a case of traumatic hypotony maculopathy treated by intravitreal air injection.<br /> Case summary: A 20-year-old female presented with decreased visual acuity in the left eye 2 days after trauma. Best corrected visual acuity (BCVA) was 0.5 and the intraocular pressure (IOP) was 5 mm Hg. Indirect ophthalmoscopy revealed chorioretinal folds in the macular area. Gonioscopy showed angle recession from 4 to 7 o’clock. Initially, pressure patching and conservative management were performed on the left eye 10 days after examination. However, deterioration of the chorioretinal fold was observed without any change in IOP. Finally, intravitreal air injection (0.5 cc) was performed 10 days after the start of conservative treatments. Following air injection, the normalization of IOP and gradual reduction of chorioretinal fold was observed. BCVA improved to 1.0 and IOP was maintained between 12 and 14 mm Hg for 24 months after the air injection.<br /> Conclusions: Intravitreal air injection may safely and effectively treat traumatic hypotony maculopathy.<br /> J Korean Ophthalmol Soc 2013;54(12):1935-1938
최경현(Kyung-Hyun Choi),김수진(Soo-Jin Kim),김형찬(Hyung-chan Kim),고정범(Jeong-bum Ko),도양회(Yang-hoi Doh),김동수(Dong-Soo Kim) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
The optimization design of the pneumatic system is able to lead the energy efficiency increasement and resources saving. Also it can support the improvement of the functions such as the high speed operation, low speed operation, low weight, and complexity of pneumatic systems. In this paper the development of the software will be described based on Object-Oriented technology, which will provide function for development of pneumatic system without any deep knowledge about pneumatic system.
한국인에서 시신경유두주위 망막혈관분포와 망막신경섬유층의 형태학적 분석
임현성,백두진,김형찬,Hyun Sung Leem,Doo Jin Paik,Hyung Chan Kim 대한안과학회 2007 대한안과학회지 Vol.48 No.10
Purpose: The study present the central retina arterial supply, optic disc shape, RNFL (retinal nerve fiber layers) thickness and optic disc rim area. Methods: To evaluate the relationship between central retina artery pattern, optic disk shape, and RNFL thickness was measured using optical coherence tomography (OCT3000) and pattern of the central retinal artery were investigated by TRC50IX. Healthy Koreans (107 males, 97 females) were enrolled in this study. The classification is made by dividing surface of the nerve head into ten sector. Results: As a result of the shape of the optic disc divided into four group, vertically oval were 54%. The results showed the central retinal artery, in 252 eyes, had its origin in the center. None of the eyes had their origin on temporal side. RNFL thickness according to OCT parameter was superior, 127.6816.16 Conclusions: In summary, this study indicates that in healthy Koreans the shape of the optic disc is vertically oval and the origin of their central retinal artery is at the center. The RFNL thickness of both the superior and inferior quadrants was 127 m according to OCT.