SimulationX를 이용한 부하 감지형 메인 컨트롤밸브의 효율에 관한 연구

김동명(Dong Myoung Kim),이정민(Jung Min Lee),정원지(Won Jee Jung),장주섭(Joo Sup Jang) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.1

본 연구에서는 오픈센터 시스템과 부하 감지형 시스템의 해석모델을 개발하고 시스템의 특성과 효율을 분석하였다. 오픈 센터 방식의 메인 컨트롤 밸브의 압력과 유량 특성을 분석하기 위해 각각의 포트별로 시험을 수행하였다. 시스템의 특성 분석 전 단계에서 시험 결과와 해석 결과를 비교함으로써 해석모델의 신뢰성을 검토하였다. 신뢰성이 검증된 오픈 센터 방식의 메인컨트롤 밸브에 유량 분배 밸브를 추가하여 부하 감지형 메인 컨트롤 밸브의 해석모델을 개발하였다. 두 가지 시스템의 효율을 분석하기 위해 동일한 부하 조건에서 해석을 수행하였으며 각각의 부하 특성에 따른 효율을 검토하였다. 또한, 서로 다른 부하 조건에서 유량 분배 시스템의 특성을 분석함으로써 복합 동작에 대한 성능도 검토하였다. In this study, we develop a model of an open center and load-sensing system and for a main control valve to analyze system characteristics and efficiency using SimulationX. In order to analyze the operating characteristics of the pressure and flow of the main control valve of an open center system, a test was performed at each port. The reliability of the model was confirmed by comparing the similarity of the analysis results with the test results before analyzing the operating characteristics of the system. Development of the load sensing main control valve was performed by adding a flow sharing valve and a notched shape to the open center system based on it’s the proven reliability. The authors performed the simulation under the same load conditions in order to compare the efficiency of the systems. Additionally, the combined operation performance was investigated by means of analyzing the characteristics of flow distribution under different load conditions.

중국 온라인시장의 현황과 활성화 방안에 관한 연구

김동명 ( Dong Myoung Kim ),상리 ( Li Sang ),이재은 ( Jae Eun Lee ) 한국유통경영학회(구 한국유통정보학회) 2013 유통정보학회지 Vol.16 No.6

최근 유통시장의 불루오션으로 전 세계의 주목을 받고 있는 중국 온라인시장의 규모는 지난해보다 성장한 조 억 위안 30.83% 7 8500 (약 1411조원)을 기록하는 높은 성장세를 보여주고 있다(디지털타임스, 2013.09.04.). 이러한 현상은 새로운 거래 방식인 온라인거래가 전통거래 방식보다 시ㆍ공간의 제약을 받지 않기 때문에 많은 사람들에 의해 선호되고 있는 것으로 여겨진다. 본 연구는 탐색적 고찰을 통해 최근 빠르게 발전하고 있는 중국 온라인시장의 현황 및 문제점들을 알아보고 그에 대한 활성화 방안을 통해 전략적 시사점을 제시하고자 한다. 정부차원에서 첫째 온라인거래에 , 관한 법 및 제도의 보완해야 한다.둘째, 온라인거래의 국제화교류증진을 위한 외자독자기업의 온라인시장 진출에 대한 정책과 외국인투자 인터넷기업들에 대한 감독업무를 이원화하여 콘텐츠 공급업체에 대한 관리를 강화해야 한다.셋째,국가의 정보화 수준을 높여야 한다.넷째,인터넷시설이 상거래 발전의 중요한 전제조건으로 활용될 수 있는 인프라를 구축하는 것이다.기업차원에서 첫째,기업의 정보화를 높여야 한다. 둘째, 기업은 법규에 따라 신기술을 표준화하도록 해야 된다. 업무운영을 표준화하여 온라인거래에서 통용되는 기술 환경을 구축하고 데이터 공유와 업무협력을 활성화시켜 나가야 한다.셋째,온라인거래의 거래안정성을 담보할 수 있는 장치를 마련하고 이에 따른 신뢰성 제고에 노력해야 한다.제3자 전자지불방식을 적극적으로 활용하여 거래의 안전성을 보장해야 된다.넷째.다양한 상품콘텐츠가 제공되어야 한다.소비자가 찾고 싶은 제품을 제대로 검색할 수 있도록 다양한 상품콘텐츠가 구축되어야 하며 이와 더불어 제품에 대한 품질이 보장되어야 할 것이다.소비자차원에서,소비자들의 온라인거래에 대한 이해와 적극적인 활용이 필요하며,자신의 개인정보보호에 대한 의식과 그와 관련된 교육이 요구된다. The Online market has been developed rapidly in China following the global trend of Online market. The Online market in China is still in its beginning stage, comparing with that of the global advanced countries, but it has a big potential to grow up. The current status of Online market in China has been reviewed, in order to achieve the goal of this study, focusing on the Online market policy and its size based on the precedent researches after overviewing the concept, attributes, types of Online market and its theoretical background. And then, it has dealt with the problems of Online market in China from the viewpoint of government, corporate, and consumers respectively. Finally, the development plan of Online market in China has been presented substantially on each standpoint of government, corporation, and consumers based on the analysis of the success factors of Taobao in China, in order to complement the problems of Online market in China. The government should supplement the laws and systems related to the Online market, To protect the consumers of Online market, first of all, the government should revise the existing Consumer Protection Act gradually through legal and technical approach for easier access to the cyber system as well as performing aggressive roles to promote the Online market. Consumers have to increase the perception level of the Online market. The consumers are requested to understand Online market and use it positively, strengthen the awareness of the personal information protection, as well as understand the relevant knowledge.

A Study on the Financial Goods Safety for e-Financial

Dong-Myung Kim(김동명),Jin Gi-Myoung(진기명) 국제e-비즈니스학회 2014 e-비즈니스 연구 Vol.15 No.2

연구발표초록 ( 공업화학 ) : 이상분산반응계의 열화학적 에너지저장능력 해석

정흥조 (정),김동명 (학),차영록 (학),박찬영 (정) ( Heung Joe Jung,Dong Myoung Kim,Young Rok Cha,Chan Young Park ) 한국화학공학회 1992 춘계학술발표회 Vol.- No.-

공동주택 단지내 빗물이용 활성화 방안 연구

최정호(Choi Jong-Ho),김동명(Kim Dong-Myoung),이만형(Lee Man-Hyung) 한국지역개발학회 2011 한국지역개발학회 학술대회 Vol.2011 No.6

As a promising type of substitute water resources, an appropriate collection of rainwater would significantly contribute to existing water supply. Furthermore, it also exerts positive impact on restoring water supply system in a broader perspective. As a practical means, active measures of rainwater collection within apartment complex would guarantee physical and non-physical benefits at the same time. This paper firstly examines the rainwater utilization conditions in Korea. Secondly, applying existing apartment cases, it analyzes legal and institutional supporting system. Thidly, it suggests practical alternatives stressing active rainwater utilization with apartment complex.

레이저홍채절개술 단독 치료와 아르곤레이저주변홍채성형술 병용 치료 후 전안부빛간섭단층촬영 결과 비교

박형주,박기호,김석환,김태우,김동명,Hyung Ju Park,MD,Ki Ho Park,MD,PhD,Seok Hwan Kim,MD,PhD,Tae Woo Kim,MD,PhD,Dong Myoung Kim,MD,PhD 대한안과학회 2011 대한안과학회지 Vol.52 No.5

Purpose: To compare the changes in angle parameters after laser peripheral iridotomy (LPI) alone versus LPI and ALPI (argon laser peripheral iridoplasty) in primary angle closure patients by using anterior segment optical coherence tomography (AS-OCT). Methods: A total of 25 eyes from 17 patients with narrow angles were enrolled in this present study. Eleven eyes in the LPI treatment group and 14 eyes in the LPI and ALPI combined treatment group were evaluated using AS-OCT. The anterior chamber depth (ACD), angle opening distance at 500 μm (AOD 500) and 750 μm (AOD 750), angle recess area at 500 μm (ARA 500) and 750 μm (ARA 750), trabecular-iris space area at 500 μm (TISA 500) and 750 μm (TISA 750), trabecular-iris angle (TIA) were measured. The pre- and post-treatment parameters were compared in each group. The parameter changes after laser treatment were also compared. Results: AOD 500, AOD 750, ARA 500, ARA 750, TISA 500 and TISA 750 except ACD significantly increased following LPI treatment (p = 0.013, p = 0.010, p = 0.008, p = 0.003, p = 0.006, p = 0.003, p = 0.013, respectively, Wilcoxon signed rank test) and LPI and ALPI combined therapy (p = 0.001, p = 0.001, p = 0.001, p = 0.001, p = 0.001, p = 0.001, p = 0.001, respectively, Wilcoxon signed rank test). The AOD 500 difference, TISA 500 difference, and TISA 750 difference were significantly greater after LPI and ALPI combined therapy than after LPI treatment alone (p = 0.112, p = 0.147, p = 0.049, p = 0.037, respectively, Mann-Whitney U-test). Conclusions: The results from the present study showed LPI alone or LPI and ALPI combined therapy significantly widened the anterior chamber angle and combined therapy showed greater effect than LPI alone. J Korean Ophthalmol Soc 2011;52(5):566-573

콘크리트 전주 구조체의 접지효과 측정 및 분석

최종기(Jong-Kee Choi),김동명(Dong-Myoung Kim),이형수(Hyung-Soo Lee),심건보(Keun-Bo Shim),김경철(Kyung-Chul Kim) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.1

콘크리트 전주는 배전선로 지지물로서 널리 사용되고 있다. 전주의 접지저항을 규정치 이내로 유지하기 위하여 동피복 접지봉을 포함한 여러 종류의 접지전극들이 사용되어 왔다. 전주 내부에는 철근이 들어있기 때문에 지중에 매설되는 전주 하단은 어느 정도 구조체접지극으로서 작용을 하게 된다. 본 논문에서는 전주 접지선으로 시험전류를 주입하면서 주입되는 전류와 금속 접지극으로 분류되는 전류를 각각 측정하였다. 이로써 전주 구조체로 분류되는 전류의 간접측정이 가능하였다. 측정결과에 근거하여 금속 접지극의 접지저항과 전주 구조체로 분류되는 전류크기 간의 상관관계를 분석하였다. Concrete poles(CP) are popular supports for distribution lines. Various types of grounding electrode, such as copper-clad rods, have been used to maintain CP’s ground resistance under the required value. The buried part of CP can also have structural grounding effect because of its iron reinforcing rods inside CPs. In this paper, we measured the total ground current injected into CP ground while measuring the ground current spliting to the metal electrode as well as the total injecting current, By this, it was able to measure the ground current splitting to CP structure. Based on the measured results, interrelationship between ground resistance of metal electrodes and current split factor to CP structure was analyzed.

튜브 결찰 및 스텐트 방식에 따른 방수유출장치 내 유동저항의 평가

박형주,박기호,김석환,김태우,김동명,Hyung Ju Park,Ki Ho Park,Seok Hwan Kim,Tae Woo Kim,Dong Myoung Kim 대한안과학회 2011 대한안과학회지 Vol.52 No.5

Purpose: To evaluate the flow resistance though the tube in a glaucoma drainage implant using various tube ligation methods. Methods: To measure the flow resistance, the following tube ligation methods were designed and tested: Type 1: no ligation of Ahmed valve tube. Type 2: ligation of Ahmed valve tube with 8-0 Vicryl. Type 3: ligation of Molteno tube and a 6-0 Vicryl as an intra-luminal stent with 8-0 Vicryl. Type 4: ligation of Ahmed valve tube and three strands of 8-0 nylon as extra-luminal stents with 8-0 Vicryl. Type 5: ligation of Ahmed valve tube and a 6-0 Prolene as an extra-luminal stent with 8-0 Vicryl followed by removal of the Prolene for partial ligation. Results: The pressure was maintained under 0.143 mm Hg in type 1. In type 2, the pressure increased to 6.688 mm Hg and dropped to approximately 6.384 mm Hg. In type 3, the pressure was maintained at 5.396 mm Hg which decreased to 3.572 mm Hg after stent removal. In type 4, the pressure was maintained at 5.700 mm Hg which dropped to 5.472 mm Hg after the 1st stent removal, to 5.016 mm Hg after the 2nd stent removal and to 4.180 mm Hg after the 3rd stent removal. In type 5, the pressure increased to 6.384 mm Hg and decreased to 5.624 mm Hg. Conclusions: The tube ligation along with extra-luminal stents followed by staged removal may provide prevention of hypotony and staged control of intraocular pressure after a glaucoma implant operation. J Korean Ophthalmol Soc 2011;52(5):610-617

홍씨 앞방각측정법의 임상적 유용성

강신희,박기호,홍철,김동명,Shin Hee Kang,M,D,Ki Ho Park,M,D,Chul Hong,M,D,Dong Myoung Kim,M,D 대한안과학회 2007 대한안과학회지 Vol.48 No.3

Purpose: To compare the Hong`s grading method, utilized for slit-lamp grading of the mid-peripheral angle, with other conventional grading methods. Actual angle was measured by ultrasound biomicroscopy (UBM) for comparison. Methods: Fifteen eyes with narrow angles and eighteen eyes with wide angles were studied. The average age of thirty-three subjects was 46.8±19.2, and the male to female ratio was 1:3.7. The mid-peripheral angle was graded by Hong`s, van Herick`s and Spaeth`s grading system. The actual anterior chamber angle was evaluated by UBM and the correlation between each grading system and actual angle was investigated. Results: The results from the Hong`s grading (r=0.802, R2=0.643, p<0.01), Spaeth`s grading (r=0.728, R2=0.530, p<0.01) and van Herick`s grading (r=0.618, R2=0.382, p<0.01) methods correlated significantly with the actual angles. Conclusions: The Hong`s grading method was an easy and effective tool to evaluate anterior chamber angle. In addition, the results of the Hong`s grading method were closer to the actual angle than the other methods.

공동주택 단지내 빗물이용 활성화 방안 연구

최정호(Choi, Jong-Ho),김동명(Kim, Dong-Myoung),이만형(Lee, Man-Hyung) 한국지역개발학회 2011 한국지역개발학회 세미나 논문집 Vol.2011 No.1

As a promising type of substitute water resources,an appropriate collection of rainwater would significantly contribute to existing water supply.Furthermore,it also exerts positive impact on restoring water supply system in abroader perspective. As a practical means,active measures of rainwater collection within apartment complex would guarantee physicaland non-physicalbenefits atthe same time.This paper firstly examines the rainwater utilization conditions in Korea.Secondly,applying existing apartment cases, it analyzes legal and institutional supporting system.Thirdly, it suggests practical alternatives stressing activerain waterutilization with apartment complex.