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송병희,명노석,장선준,권정태 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.2
In the hydrogen compression cycle, which is currently being developed, hydrogen is compressed to a very high pressure using a compressor, and then stored and used in a high-pressure vessel. This shows that an increase in the temperature of hydrogen in the vessel due to a pressure rise during the filling process and the pressure fatigue due to the repeated cycle may cause problems in the reliability of the vessel. In this paper, for the entire processes in a 50 MPa hydrogen compression system, theoretical and numerical methods were conducted to analyze the following: the temperature increase of hydrogen in the vessel and the time required to reach thermal equilibrium with the surroundings, the change in temperature of hydrogen passing through the pressure reducing valve, and the required capacity of the heat exchanger for cooling the vessel. The results will be useful for the design and construction of hydrogen compression systems, such as hydrogen charging stations. 현재 개발되고 있는 수소 압축 사이클에서는 압축기를 통해 초고압으로 압축된 수소를 고압용기 내에 저장하여 사용한다. 이러한 충전과정 중 용기내의 수소의 압력 및 온도 상승으로 인하여 고압용기에서 열응력이 발생할 수 있다. 고압용기의 신뢰성을 확보하기 위해서는 용기내의 수소의 온도를 예측하고 제어하는 것이 중요하다. 본 논문에서는 이러한 고압용기의 신뢰성 해석을 위하여 50 MPa급 수소압축시스템에서 고압용기를 충전하는 과정에서의 압력상승에 따른 용기 내의 수소온도 변화 및 외부와의 열평형까지 걸리는 시간, 감압밸브를 지날 때의 수소온도 변화, 고압용기 냉각을 위한 열교환기의 요구능력 등에 대하여 이론적인 방법과 수치적인 방법으로 해석을 수행하였다. 이론해석 결과, 고압용기의 내부 온도는 충전하기 전에 40 ℃에서 충전 후 1st cycle, 2nd cycle에서 평균적으로 126.675 ℃, 62.1 ℃가 증가하였다. 또한, 고압용기의 충전량은 1st cycle, 2nd cycle에서 각각 7.9 kg, 8.9 kg으로 계산되었다. 본 연구의 결과는 수소충전소와 같이 수소압축시스템이 필요한 현장의 인프라 설계 및 구축 등에 유용하게 활용 될 것이다.
송병희 ( Byung Hee Song ),안병준 ( Byoung Jun Ahn ),백기현 ( Ki Hyon Paik ) 한국목재공학회 2010 목재공학 Vol.38 No.3
The purpose of this study was to seek the optimum condition for effective separation of the chemical constituents of wood biomass by means of hydrolysis of acetone solution in presence of acid salt as a catalyst. Out of diverse acid salts the catalytic effect of aluminum sulfate (Al2(SO4)3) was the most excellent during the hydrolysis of wood biomass in the acetone solution and the optimum concentration was 0.01 M (6.3 wt%). In the condition of mixture ratio of acetone and water to 9:1 as well as optimum concentration of aluminum sulfate two wood biomass species, oak wood (Quercus mongolica Fischer) and Pine wood (Pinus densiflora Sieb. et Zucc.), was hydrolyzed for 45 minutes at 200°C and the degree of hydrolysis was determined to 92.7% and 92.4%, respectively. Extending the reaction time to 60 minutes in the mixture ratio of acetone and water to 8:2 the degree of hydrolysis of oak wood was also ca. 92.7%. In the case of Pinus, however, the similar hydrolysis ratio was obtained at 210°C. As the temperature and hydrolysis time increased, the quantitative amount of lignin recovered from the hydrolysate clearly increased, whereas the total amount of carbohydrates in the hydrolysate decreased rapidly. Considering the recoverable amount of lignin and carbohydrate in the hydrolysate, the best condition for the hydrolysis of wood biomasses were confirmed to the mixture ratio of acetone and water to 8:2, the concentration of aluminum sulfate of 6.3 wt%, hydrolysis temperature of 190°C for 60 minutes. In this condition the total amounts of carbohydrate in the hydrolysates of oak wood and pine wood were estimated to 47.6% and 51.4%, respectively. The amount of lignin recovered from the hydrolysates were ca. 18.2% for oak wood and 13.7% for pine wood.
군매장의 효율적 POS시스템 운영방안에 관한 실증적 연구 : 공군과 해군의 매장관리 시스템을 중심으로
양경훈,강석구,송병희 중앙대학교 산업경영연구소 1999 산업경영연구 Vol.8 No.2
POS 시스템은 광범위한 적용대상을 가지고 있다. POS 시스템은 편의점이나 백화점과 같은 유통업체로부터 활용되기 시작하였으나 판매정보 이외에 기존 수집 자료를 기초로 상품정보와 재고관리, 수발주에 따른 물류관리, 고객관리, 인사관리에 이르기까지 종합적인 정보를 제공하는 시스템으로 발전되어 나감으로써 제조업체뿐만 아니라 공공기관에 까지 활용되고 있으며 기업의 통합적인 물류관리를 위하여 필수불가결한 시스템으로 자리잡고 있다. 본 연구는 군에서의 효율적인 POS 시스템의 운영방안을 살펴보려 한다. 영리기업이 POS 시스템을 활용하여 정보를 신속, 정확하게 처리함으로써 고객 만족 또는 이윤추구목적은 달성할 수 있었다면 군도 특정영역에서 조직 목표를 달성하는데 POS 시스템을 유용하게 유효한 성과를 거둘 수 있을 것으로 기대된다. POS system was initially introduced to some leading circulation businesses such as CVS or department stores. Since then POS system has been developing into an integral information system, enlarging its range of application - from basic data collection to product information; inventory management; customer service; and personnel management. As circulation companies struggle to get more competitive edge, the number of companies that make strategic use of the secured information is soaring. In pace with the era of information revolution, military organizations have introduced POS system to some daily sales process at BX shops. Since the POS system will surely increase work efficiency, my suggestion, based on the survey, is that the navy should adopt POS system in its BX management. For better results to its full potential, POS system should be designed and implemented in consideration of various demands from relevant departments. Lastly, some measures should be arranged in order to maximize its benefits.
양경훈,김도일,유훈상,송병희 중앙대학교 산업경영연구소 2001 산업경영연구 Vol.10 No.1
The CIO(Chief Information Officer) is a manager who takes care of the business strategies of information technologies in organizations. Because of the importance of IT,, many organizations have recently adopted the CIO systems. However no objective criteria of the evaluation of CIO systems prevents the wide spread of this systems. We suggest two models to solve this problems: one is evaluation model of the CIO systems in the organizations and the other is the evolution model of the development of CIO systems. The evaluation model consists of three parts; Business, IT, and CIO's personal quality part. The evolutionary model consists of three steps; Level 1 is the IT Expert step, Level 2 is the IT Strategist step, and Level 3 is the Business Leader step. In this paper, organization is classified into two groups by two ways. One is the service industry organizations and the non-service industry organizations and the other way is the CIO-adopted organizations and the non CIO-adopted organizations.