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전단동축형 분사기의 유량계수에 대한 형상학적 변수들의 영향
안종현,이근석,안규복,Ahn, Jonghyeon,Lee, Keunseok,Ahn, Kyubok 한국분무공학회 2020 한국액체미립화학회지 Vol.25 No.3
Six shear coaxial injectors for a 3 tonf-class liquid rocket engine using oxygen and methane as propellants were designed and manufactured by considering geometric design parameters such as a recess length and a taper angle. Cold-flow tests on the injectors were performed using water and air as simulants. By changing the water mass flow rate and air mass flow rate, the injection pressure drop under single-injection and bi-injection was measured. The discharge coefficients through the injector oxidizer-side and fuel-side were calculated and the discharge coefficient ratio between bi-injection and single-injection was obtained. Under single-injection, the recess served to reduce the injection pressure drop on the injector fuel-side. For the injectors without recess, the discharge coefficients under bi-injection were almost the same as those under single-injection. However, for the injectors with recess, the taper angle and bi-injection had a significant effect on the discharge coefficient.
안종현,이혁,좌성훈,Ahn, Jong-Hyun,Lee, Hyouk,Choa, Sung-Hoon 한국마이크로전자및패키징학회 2013 마이크로전자 및 패키징학회지 Vol.20 No.2
Recently flexible electronic devices have attracted a great deal of attention because of new application possibilities including flexible display, flexible memory, flexible solar cell and flexible sensor. In particular, development of flexible memory is essential to complete the flexible integrated systems such as flexible smart phone and wearable computer. Research of flexible memory has primarily focused on organic-based materials. However, organic flexible memory has still several disadvantages, including lower electrical performance and long-term reliability. Therefore, emerging research in flexible electronics seeks to develop flexible and stretchable technologies that offer the high performance of conventional wafer-based devices as well as superior flexibility. Development of flexible memory with inorganic silicon materials is based on the design principle that any material, in sufficiently thin form, is flexible and bendable since the bending strain is directly proportional to thickness. This article reviews progress in recent technologies for flexible memory and flexible electronics with inorganic silicon materials, including transfer printing technology, wavy or serpentine interconnection structure for reducing strain, and wafer thinning technology.
안종현,심성용,김경준,Ahn, Jong-hyun,Sim, Sung-yong,Kim, Kyung-jun 대한한방안이비인후피부과학회 2004 한방안이비인후피부과학회지 Vol.17 No.3
Objective: Under recognition of the similarity between carbuncle in Oriental medicine and inflammatory disease, NeiShuHuangLianJang(N.H.) has been used as an antiphlogistic agent. The present reports shows the anti-inflammatory effects of N.H. Method: Experimental animals made use of 4-5 weeks age(weight 20-25g) ICR(male)mouse. They were farmed individually in a temperature($22{\pm}0.5{\circ}$) and light(06:00 to 18:00 h) controlled room with free access to water and food. The N.H.(1.0g/kg, 3.0g/kg) extracted from NeiShuHuangLianTang were administered intragastrically prior to LPS I.P injection. we measured WBC count, IL-6 level in plasma and TNF-${\alpha}$ level in plasma. Result : 1. N.H. suppressed inflammatory reaction induced by LPS. 2. N.H. suppressed WBC count in inflammatory reaction induced by LPS. 3. N.H. suppressed 1L-6 level in inflammatory reaction induced by LPS. According to above experiments, N.H. was improved its suppression effect against the inflammatory reaction through WBC count and IL-6 level. So N.H. which is used for the inflammatory disease(carbuncle) in Oriental Medicine is assumed to have a curative effects against this disease by controlling WBC count and IL-6 level in plasma.
154㎸급 중간접속부내의 부분방전 진단을 위한 HFCT 적용 기준신호 측정
안종현(Jong-Hyun Ahn),윤주호(Ju-Ho Yun),최용성(Yong-Sung Choi),박대희(Dae-Hee Park),이경섭(Kyung-Sup Lee) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
To detect partial discharge of 154㎸ joint box, we have made experiment by using the HFCT sensor. Generally the signals which are detected in partial discharge test of underground power transmission cable are accompanied with both noises of high voltage and noises of surrounding power cable. The most noise in near to end part of joint box is corona, beside other noises flowed from surrounding area. Partial discharge test is difficulty due to these noises. First, we test reliability on both injection of calibration signal in NJB and removal of low frequency. After that, we had analyzed frequencies by measuring signals in IJB with 300[m] distance from NJB. Also we had measured S/N ratio by using the indirected injection method of calibration signal in IJB. In this experiment, two measurement methods were difference of detection acquisition, but these had the equal frequency properties.
한의 복합 치료가 어깨 관절경 수술 후 급성 통증에 미치는 영향: 후향적 관찰연구
안종현 ( Jonghyun Ahn ),고준혁 ( Junhyuk Ko ),김형석 ( Hyungsuk Kim ),이성민 ( Sung-min Rhee ),이승훈 ( Seung Hoon Lee ),김고운 ( Koh-woon Kim ),정원석 ( Won-seok Chung ),송미연 ( Mi-yeon Song ),정석희 ( Seok-hee Chung ),이종수 ( 한방재활의학과학회 2021 한방재활의학과학회지 Vol.31 No.2
Objectives The purpose of this study was to verify the effect of integrative Korean medicine on acute postoperative pain after arthroscopic shoulder surgery. Methods This study was conducted in a retrospective observational way. Patients who met the inclusion criteria were divided into integrative Korean medicine-treated group (IKM group) and no integrative Korean medicine treated-group (No IKM group). The primary outcome was the difference in the amount of change in pain intensity. The secondary outcome was the difference in pain intensity, opioid consumption over time, and the number of adverse events after surgery. Results The change of numerical rating scale for pain intensity from baseline to IKM group was 3.09±2.12, while 2.64±1.80 in no IKM group, and the difference of change between two groups was statistically significant (p<0.05). Difference in the use of opioid between two groups over time after surgery was also statistically significant (p=0.000). Conclusions The results of this study suggest that integrative Korean medicine can be effective for acute postoperative pain after arthroscopic shoulder surgery. (J Korean Med Rehabil 2021;31(2):69-79)
안종현 ( Jonghyeon Ahn ),이근석 ( Keunseok Lee ),안규복 ( Kyubok Ahn ) 한국분무공학회 2021 한국액체미립화학회지 Vol.26 No.1
Six shear coaxial injectors with different recess length and taper angle were manufactured. Cold-flow tests on the injectors were performed at room temperature and pressure using water and air as simulants. By changing the water mass flow rate and air mass flow rate, spray images were taken under single-injection and bi-injection. Breakup length and spray angle were analyzed from instantaneous and averaged spray images using image processing techniques. For all the injectors, the breakup length generally decreased as the momentum flux ratio increased at the same gas mass flow rate. The injectors with 7.5° taper angle usually had the longest breakup length and the smallest spray angle. When the taper angle was 15° or more, it hardly affected breakup length and spray angle. The recess length did not influence breakup length but its effect on spray angle depended on the taper angle.
안종현(Jong-Hyun Ahn),윤주호(Ju-Ho Yun),최용성(Yong-Sung Choi),최충석(Chung-Seog Choi),박대희(Dae-Hee Park),이경섭(Kyung-Sup Lee) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
In this paper, we developed HPF (high pass filter) consisted of lumped LC components to decrease the noises that are detected in PD (partial discharge) measuring test, and adapted it to field test. We tested under laboratory circumstances like thc fields, and measured the phase change properties of detected signal in UHF sensor with Lemke probe and oscilloscope (TDS-3054, Tektronix).
안종현(Zong-Hyun Ahn),이정록(Jeong-Rock Lee) 대한지리학회 2009 대한지리학회지 Vol.44 No.4
본 연구는 완도군에서 개최하는 완도 장보고축제를 사례로 지역축제 방문객의 만족인자를 도출하고, 각 군집별로 전반적 만족, 재방문, 추천의사에 있어 차이가 있는지를 고찰하였다. 완도 장보고축제는 1996년‘장보고’라는 테마의 등장을 알린 이후, 2005년 드라마‘해신’의 성공에 따라 전국적인 인지도를 확보하게 되었으며, 2009년 현재 14회째 개최되었다. 본 연구에서는 18개의 지역축제 방문객 만족인자 항목을 구성하여 설문조사를 통한 실증분석을 하였다. 인자분석 후 3개의 인자가 도출되었으며, 군집분석 후 3개의 군집으로 분류되었다. 본 연구의 결과로 지역축제 만족군집 유형별로 전반적 만족과 재방문, 그리고 추천의사에 있어 모두 유의한 평균의 차이가 존재하는 것으로 밝혀졌다. 특히‘주변 관광과 편의시설군’이 전반적 만족과 재방문, 추천의사 모두에서 가장 높은 점수를 나타냈다. 결과적으로 지역축제 방문객의 만족인자 중에서 주변 관광과 편의시설의 중요성을 간과할 수 없음을 알 수 있다. The purpose of this study is to examine the determinant factors of satisfaction and to investigate the difference from clusters in the category of overall state of satisfaction, the thought of revisiting, and the intention of recommendation with the case of Wando Changpogo Festival. Changpogo Festival has been held since 1996 with the theme of ‘Changpogo’, gained great acknowledgment from television drama, ‘Haeshin’, and this year of 2009 is its fourteenth. The study analyzed questionnaire which is made up of items on satisfaction factors of 18 local festival visitors. Results from factor analysis are 1) the contents and the souvenir of the festival, 2) work for publicity, 3) tour for near place and convenient facilities. Likewise, results from cluster analysis are 1) a cluster of the contents and the souvenir of the festival, 2) a cluster of tour for near place and convenient facilities, 3) a cluster of work for publicity. In conclusion, there are similar degrees in difference between clusters, but especially the ‘tour for near place and convenient facilities’ factor has higher score than the others. Therefore, this factor should be cared with great importance.