• Journal of Power System Engineering
• /
• v.6 no.3
• /
• pp.57-63
• /
• 2002

This paper describes the acoustic analysis of mid duty truck. The focus of the analysis is on structure borne engine noise with major contributions of 2nd order. It has been previously recognized that the noise contribution of each transfer path of structure borne noise can be varied with the charateristics of each mounts and vibro acoustic sensitivity of car body. The structure of car body will be split up into three major sub components, which are modeled separately, the engine, the frame and the cab. The acoustic performance is evaluated on three levels: engine to frame transfer, frame to cab transfer, and panel contribution from cab to driver. In order to perform these analyses, analytical models are created for the engine, frame, cab and acoustic cavity. The models are linked through a coupled fluid structure calculation, and through FRF Based Substructuring for the structural couplings. Based on the structural coupling calculations, a transfer path analysis is performed to identify the most important transfer paths. These paths are then the focussing points for applying modifications to the structure or the mount system. Finally, a number of modification are proposed and their effect is quantified.

• Journal of radiological science and technology
• /
• v.15 no.2
• /
• pp.17-23
• /
• 1992

Simple chest radiography is the most frequently performed examination in radiologic practice. However, with transmitted dose through chest which has the problem of wide variations in absorption, conventional Film/Screen Combinations Method make it difficult to delineate lung field mediastinum & cardia portion and subdiaphragmatic structures. In order to overcome this problem, we have been tried several methods as follows. High Kilovoltage Technique, Rare Earth Screen/Wide Lattitude Film, Use of Compensating Filter and Digital Beam Attenuator and recently Insigh System has been developed. In this paper, we'd like to discuss Insight film through apperciation by measuring the difference of contrast. In order to evaluate insight film. We have done experiments using Insight System with Simple Phase, Picker 550. We could get an result which was able to overcome the limitted dynamic range of conventional Film/Screen System remarkably.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.12 no.3
• /
• pp.96-101
• /
• 2013

Automotive brake system is an essential element for the safety. The system is powered by the circulation of brake oil. A braker hose is used for the circulation of the oil in this system. Layout of the hose changes according to the steering and stress occur in the hose. A lot of the durability tests are performed in order to prevent serious problems such as hose bursting by the accumulation of the stress before setting an optimized hose layout on automobile. The test is conducted for the layout which is same such as set in automobile. In the test, brake hose layout shall exercise the same mode of thousands of times under the high temperature and periodic pressure condition and then the damage of the tested hose is inspected. This test, however, has a disadvantage of heavy consumption of time and money. In order to compensate for these drawbacks, the finite element method(FEM) study was performed to predict the changes in the layout of the brake hose. In this study, the FEM results and the test results were compared and the validity was verified. The radius of curvature of the FEM and test at the same positions were especially investigated for the validation. Also, this study will be used as the basis of research on the life prediction of brake hose.

• Mass Spectrometry Letters
• /
• v.6 no.4
• /
• pp.105-111
• /
• 2015

Sixteen compounds of Neobalanocarpus heimii were successfully identified directly from their plant extract using a triple quadrupole LC-MS/MS system. In order to fulfil the objectives of this work, a series of stilbene oligomers of various degrees of condensation were isolated and their structure are characterized. Out of these, four are resveratrol dimers, three trimers, and nine tetramers. The isolation process was done on a fully automated semi-preparative HPLC system. Their structures were elucidated on the basis of 1D- and 2D-NMR as well as MS data. The mass fragmentation patterns of the compounds were recorded and a retrievable in-house library was built to keep the data. In order to demonstrate the potential of this approach, the polyphenolic crude extract was analysed with the LC-MS/MS system and the MS/MS spectra extracted for each chromatographic peak of interest. The fragmentation patterns were compared with those of anticipated pure compounds that were previously recorded. All compounds were successfully identified. It is therefore believed that the LC-MS/MS potential for dereplication of structurally similar compounds in a crude mixture was thus firmly established.

• Magazine of the Korean Society of Agricultural Engineers
• /
• v.35 no.3
• /
• pp.130-139
• /
• 1993

In order to evaluate the long-term permeability performace of the geotextiles, for five different combination of geotextiles and soils the long-term column test method The results obtained are as follows; 1.The gradient range of the initial stage of the long-term permeability curves varied with respect to the soil types, while that of the final stage varied according to the interaction of the soil/geotextile system. 2.The time required for a given soil/geotextile system to reach a interactive stable stage was measured ahout 100 hours for the standard sand and 150 to 600 hours for the silty content soils, respectively. 3.There were no differences between the plain woven geotextile and the non-geotextile in the long-term permeability performance. 4.As the silt content increased, the long-term performance of the geotextiles decreased, and the limiting silt content was about 15%. 5.The thickness and area density of the geotextiles did not influence on the variation of the seepage quantities. 6.The ayerage slope and the transition time of the long-time flow curve were calculated. 7.In order to evaluate the mechanism of soil/geotextile system more perfectly, the gradient ratio test or the hydraulic conductivity test is required.

• Proceedings of the KSRS Conference
• /
• 2004.10a
• /
• pp.452-455
• /
• 2004

MSC (Multi-Spectral Camera) system is a remote sensing instrument to obtain high resolution ground image. EOS (Electro-Optic System) for MSC mainly consists of PMA (Primary Mirror Assembly), SMA (Secondary Mirror Assembly), HSTS (High Stability Telescope Structure) and DFPA (Detector Focal Plane Assembly). High performance of EOS makes it possible for MSC system to provide high resolution and high quality ground images. Temperature of the EOS needs to be controlled to be in a specific range in order not to have any thermal distortion which can cause performance degradation. It is controlled by full redundant CPU based electronics. The validity of thermistor readings can be checked because a few thermistors are installed on each control point on EOS. Various kinds of thermal control logics are used to prevent 'Single Point Failure'. Control logic has a few set of database in order not to be corrupted by SEU (Single Event Upset). Even though the thermal control logic is working automatically, it can also be monitored and controlled by ground-station operator. In this paper, various ways of thermal control logic for EOS in MSC will be presented, which include thermal control mode and logic, redundancy design and status monitoring and reporting scheme.

• The Journal of Information Systems
• /
• v.20 no.3
• /
• pp.41-61
• /
• 2011

In order to buy products through the Internet, consumers dissipate much time and efforts in collecting and comparing product information from various online shopping malls. Consumers can save their efforts by using price comparison sites, but there are some shortcomings in comparison shopping. Firstly, comparison sites do not show the lowest price of some products that are selling in shopping malls. Secondly, the product information provided by comparison sites is sometimes wrong. Thirdly, there are too many results. In order to overcome the shortcomings, we suggested a comparison shopping system based on RSS by using ontology matching. We used the current RSS standard for syntactic interoperability instead of suggesting new standards. Moreover, we used ontology matching for semantic interoperability to compare product information with different ontologies. The suggested ontology matching consists of three steps. The first step is finding exact sense from WordNet for a given product category, and the second step is searching for matching product category candidates from the products of RSS feeds. The final step is calculating similarities of the candidates with the target product category. From the experiments, we could get better recall rates that are suitable for e-commerce environments and the results show that our system is effective in product comparison.

• Journal of Arbitration Studies
• /
• v.24 no.2
• /
• pp.53-80
• /
• 2014

This article focuses on the Active Plan for Alternative Dispute Resolution(ADR) in financial Dispute. The financial consumers of Korea had suffered greatly from the IMF in 1997 and the global financial crisis in 2008, which also increased financial conflicts significantly. In particular, active financial transaction, due to the development of computer and financial techniques causes frequent consumer financial conflicts. It is beneficial to settle them for judicial economy through an alternative conflict arbitration system instead of lawsuit at the court. Many advanced countries settle financial conflicts through various ADR in their numerous financial conflicts. In the settlement of financial conflict, the ADR system, covering mediation and arbitration, is useful and appropriate. Each governmental institution has various conflict settlement organizations, and it is necessary to operate them effectively. In order to settle financial conflicts properly, it is necessary to study law on financial consumer protection, and it is also necessary to understand practical custom and practical knowledge and to systematize them. Further, it is important to manage financial conflict-related data, to accumulate professional experiences, and to prepare a financial conflict settlement system in order to introduce financial education earlier to the whole nation.

• Journal of Korean Society of Steel Construction
• /
• v.19 no.1
• /
• pp.87-98
• /
• 2007

Generally, main girders and steel piers of temporary bridges form the steel rahmen structure. In this study, the rational stability design procedure for main members of temporary bridges was presented using a 3D system buckling analysis and second-order elastic analysis. Six types of temporary bridges, which can be designed and fabricated in reality, were chosen and the buckling design for them was performed in consideration ofload combinations of dead and live loads, thermal load, and wind load. Effective buckling length of steel piers, transition of 3D buckling modes, and effects of second-order analysis were investigated through a case study involving six temporary bridges.

• Journal of information and communication convergence engineering
• /
• v.6 no.2
• /
• pp.129-133
• /
• 2008

In this paper, modified power control algorithms are proposed for a satellite mobile communications system with ATC (ancillary terrestrial component). In order to increase system capacity and reduce the transmitting power of the user's equipment, we propose the modified power control scheme consisting of the modified closed-loop and open-loop power control. The modified CLPC (closed-loop power control) algorithm, combining the delay compensation algorithms and pilot diversity, is mainly applied to the ATC link in urban areas because it is more suitable to the short RTD (round-trip delay). In the case of rural areas where ATCs are not deployed or a signal is not received from ATCs, combining monitoring transmitting power equipment and OLPC (open-loop power control) algorithms using an efficient pilot diversity is mainly applied to the link between the user's equipment and the satellite. Two power control algorithms are applied equally to the boundary areas where two kinds of signals are received in order to ensure coverage continuity. The simulation results show that the modified power control scheme has good performance compared to conventional power control schemes in a GEO (geostationary earth orbit) satellite system with ATC.