• 산업경영시스템학회지
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• 제32권1호
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• pp.44-51
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• 2009

A bonded warehouse is the warehouse located in bonded area. It functions not only as a general warehouse but also as a place for managing the work related to import and export bonded goods. As a general warehouse, it uses the rack system to store the goods and the folk lift truck to move the unitized goods. The operation of the storing system closely related to the efficiency of space uses in a warehouse and vehicle working. Thus, vehicle performance measured in distance units in the ware-house could be used as one of the key performance measure in warehouse system. This paper focuses on the operation efficiency of the bonded warehouse which uses rack system for the storing and the folk lift truck for moving goods. The method of load allocation for balancing the rack uses and vehicle operation for maximizing efficiency are the specific concerns in this paper. The simulation study is conducted to find a policy for efficient vehicle operation based on balanced rack utilization, and the favorable result for the system operation would lead the usable proposal in vehicle operation.

• International Journal of Concrete Structures and Materials
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• 제10권2호
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• pp.149-161
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• 2016

This paper presents an experimental work to study the flexural strength of reinforced concrete (RC) beams strengthened by partially de-bonded near surface-mounted (NSM) fiber reinforced polymer (FRP) strip with various de-bonded length. Especially, considering high anchorage capacity at end of a FRP strip, the effect of de-bonded region at a central part was investigated. In order to check the improvement of strength or deformation capacity when the bonded surface area only increased without changing the FRP area, single and triple lines of FRP were planned. In addition, the flexural strength of the RC member strengthened by a partially de-bonded NSM FRP strip was evaluated by using the existing researchers' strength equation to predict the flexural strength after retrofit. From the study, it was found that where de-bonded region exists in the central part of a flexural member, the deformation capacity of the member is expected to be improved, because FRP strain is not to be concentrated on the center but to be extended uniformly in the de-bonded region. Where NSM FRP strips are distributed in triple lines, a relatively high strength can be exerted due to the increase of bond strength in the anchorage.

• 수산해양교육연구
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• 제28권6호
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• pp.1706-1714
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• 2016

In the 21th century, with the development of the economic global progress, the competition is more stiff. During the fierce competition, 85% of the world's trade volume is root from the sea transportation, that means the harbor trade is becoming an important part in the world's trade. With the strong support of the Chinese national ministries, Tianjin Dongjiang Bonded Port Area had made a series of encouraging results and now becoming a positive mode of the chinese harbor trade port. In the meanwhile, the Dongjiang Bonded Port Area is also searching for the change and a better development. From this year, the Dongjiang Bonded Port Area is apply for the experimental unit to change from the Bonded Port Area to the Free Trade Zone. This paper focus on the Tianjin Dongjiang Bonded Port Area which is the largest port area in the northern part of China. The development progress of the Dongjiang Bonded Port Area is concerned and studied in the paper. This paper expected to research on the transformation progress from the Bonded Port Area to the Free Trade Zone, to find out appropriate ways for the blossom of the harbor trade and the bonded area.

• 한국도로학회논문집
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• 제13권2호
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• pp.31-39
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• 2011

국내 고속도로의 60% 이상이 시멘트 콘크리트 포장으로 건설되었으며, 그 중 공용년수가 20년이 넘어선 구간이 절반 이상에 달하고 있다. 노후화된 시멘트 콘크리트 포장의 보수 보강은 국내의 교통여건상 우회도로가 준비되기 어렵기 때문에 조기 교통개방이 요구되며 현재까지는 주로 아스팔트 덧씌우기가 사용되고 있다. 반면에 아스팔트 덧씌우기 포장은 조기 파손으로 인해 많은 유지보수비용이 지출됨과 동시에 도로사용자의 불편을 초래하고 있다. 최근 들어 노후화 된 시멘트 콘크리트 포장의 효율적인 보강공법으로 접착식 콘크리트 덧씌우기 공법에 대해서 적용을 시도하고 있다. 따라서 아스팔트 덧씌우기 포장과 접착식 콘크리트 덧씌우기 포장의 합리적인 선택에 대한 비교 분석을 위해 포장의 연도별 파손상태에 대한 다양한 data가 필요하다. 하지만, 국내에서는 아스팔트 덧씌우기 포장과 접착식 콘크리트 덧씌우기 포장의 공용 중 파손상태에 대한 자료가 체계적으로 구축되어있지 않다. 본 연구에서는 아스팔트 덧씌우기와 접착식 콘크리트 덧씌우기 공법이 적용된 구간의 파손에 대해 충분한 자료를 구축하고 있는 미국의 LTPP Data를 이용하여, 공용성에 대해서 평가하였다. 단, 아스팔트 덧씌우기와 접착식 콘크리트 덧씌우기 공법은 파손형태가 서로 상이함으로써, 상대적인 비교를 위해 각각의 구간에 대해 포장상태지수(PCI, Pavement Condition Index)를 Database화 하였으며, 아스팔트 덧씌우기 구간과 접착식 콘크리트 덧씌우기 구간의 수명에 대해서 비교 분석을 수행하였다.

• 한국항만경제학회지
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• 제21권3호
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• pp.83-113
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• 2005

In this study, for purpose of searching for measures to lower the logistics costs which is one of the most difficulties for the small-medium sized manufacturers in Pusan and Kimhae, those manufacturers were surveyed with questionnaire about the facts in the export logistics costs, difficulties related to the costs, and measures they thought for lowering the cost. Taking account of findings from the survey, the comprehensive measures of saving the export logistics costs were to be proposed. In the surveyed manufacturers, the problems they thought over export logistics costs lied in short logistics information and transportation-related difficulties in cargo and distribution, insufficient standardization in packaging and the shortage of material handling equipments in unloading. In transportation, frequent non-fulfillment of in-time shipment, cost increase including over consumption of transportation time due to traffic jam, and the biased heavy use of inland transportation were pointed out as problems. In customs clearance, logistics information, and marine insurance, addressed were complexity in custom clearance and bonded transportation procedures, and the shortage of software and hardware to construct logistics information system.

• 한국전기전자재료학회논문지
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• 제17권5호
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• pp.515-520
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• 2004

We report on the development of a Piezoelectric valvc that is designed to have a high reliability for fluid control systems, such as mass flow control, transportation and chemical analysis. The valve was fabricated using a MCA(multilayer ceramic actuator), which has a low consumption power, high resolution and accurate control. The fabricated valve is composed of MCA, a valve actuator die and an seat die. The design of the actuator dic was done by FEM(finite element method) modeling, respectively. And, the valve seat die with 6 trenches was made. and the actuator die, which possible to optimize control to MCA, was fabricated. After Si-wafer direct bonding between the seat die and the actuator die, MCA was also anodic bonded to the scat/actuator die structure. PDMS(poly dimethylsiloxane) sealing pad was fabricated to minimize a leak-rate. It was also bonded to scat die and stainless steel package. The flow rate was 9.13 sccm at a supplied voltage of 100 V with a 50 % duty ratio and non-linearity was 2.24 % FS. From these results, the fabricated MCA valve is suitable for a variety of flow control equipments, a medical bio-system, semiconductor fabrication process, automobile and air transportation industry with low cost, batch recess and mass production.

• 한국항해항만학회지
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• 제32권8호
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• pp.659-665
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• 2008

본 논문은 최근의 급변하는 국제무역환경, 통관제도의 발전내역, 컨테이너물동량의 변화추이 등을 살펴보고 물류현장에서의 경험과 다양한 의견 수렴을 토대로 부산항에 대하여 부두지역에서의 컨테이너화물 물류를 촉진할 수 있는 효율적인 통관제도를 연구하였다. 항만지역 컨테이너의 흐름을 더욱 원활히 하기 위하여 해상 수입화물의 적하목륵 제출$\sim$하선신고$\sim$반입신고 구간에서 보세운송신고와 수입통관에 제한을 두고 있는 구간을 개선하는 방안을 제시하였고, 물류보안 강화를 통한 항만경쟁력을 확보하기 위하여 수출화물 선적지세관 선별검사제도와 환적 컨테이너 고체작업 예정신고제 및 컨테이너번호 봉인번호 추적체계 도입 등을 제시하였다.

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2007년도 춘계학술대회
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• pp.330-335
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• 2007

국가 간 무역 활성화로 인하여, 국제 물류의 고도화가 요구되는 현 시점에서 보세창고의 운영 효율성을 제고할 필요성이 커지고 있다. 그러나 현재의 보세창고 프로세스 중 검수 및 장치화물관리 프로세스는 수작업으로 인한 오류발생률이 높아 효율성이 저하되는 문제점을 가지고 있다. 따라서 본 논문에서는 이에 대한 해결책으로 보세창고에 RFID 기술을 적용하여 검수작업을 자동화하는 방안을 제시하였다. RIFD 기술 도입은 검수 작업의 효율화뿐만 아니라, 향후 실시간 장치화물관리, 창고 내 Resource 관리 등 창고관리의 제 분야에 활용되어 보세창고관리의 효율성을 제고시킬 것으로 기대된다.

• Journal of Microbiology and Biotechnology
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• 제24권9호
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• pp.1254-1259
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• 2014

We investigated whether ${\beta}$-galactosidase (${\beta}$-gal)-containing Escherichia coli cells could transfer a galactose to 2-phenoxyethanol, resulting in 2-phenoxyethanol galactoside (PE-Gal). PE-Gal was confirmed by liquid chromatography-mass spectrometry. In addition, we also confirmed that a galactose molecule was covalently bonded with PE during thin-layer chromatography analysis of the ${\beta}$-gal hydrolysate of PE-Gal. The yield for PE-Gal synthesis was about 37.5% (weight basis), which was about 7-8 times greater than that of a previous report. In addition, the concentration of ${\beta}$-gal (0.96 U/ml) used in this PE-Gal synthesis was about 20 times less than that in a previous report.

• International Journal of Precision Engineering and Manufacturing
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• 제8권2호
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• pp.44-48
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• 2007

In recent years, the size of plane substrates and semiconductor wafers has increased. As conventional contact transportation systems composed of, for example, carrier rollers, belt conveyers, and robot hands carry these longer and wider substrates, the increased weight results in increased potential for fracture. A noncontact transportation system is required to solve this problem. We propose a new noncontact transportation system combining acoustic viscous and aerostatic forces to provide damage-free transport. In this system, substrates are supported by aerostatic force and transported by acoustic viscous streaming induced by traveling wave deformation of a disk-type stator. A ring-type piezoelectric transducer bonded on the stator excites vibration. A stator with a high Q piezoelectric transducer can generate traveling vibrations with amplitude of $3.2{\mu}m$. Prior to constructing a carrying road for substrates, we clarified the basic properties of this technique and stator vibration characteristics experimentally. We constructed the experimental equipment using a rotational disk with a 95-mm diameter. Electric power was 70 W at an input voltage of 200 Vpp. A rotational torque of $8.5\times10^{-5}Nm$ was obtained when clearance between the stator and disk was $120{\mu}m$. Finally, we constructed a noncontact transport apparatus for polycrystalline silicon wafers $(150(W)\times150(L)\times0.3(t))$, producing a carrying speed of 59.2 mm/s at a clearance of 0.3 mm between the stator and wafer. The carrying force when four stators acted on the wafer was $2\times10^{-3}N$. Thus, the new noncontact transportation system was demonstrated to be effective.