• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.1
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• pp.31-39
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• 2004

This paper presents design solutions for cam type transfer unit in which feeding, lifting, and clamping motions are generated by cams. In order to achieve faster transfer motion, each designed cam must satisfy the given specifications such as velocity, acceleration, jerk, pressure angle, cam thickness, and torque. To reduce absolute torque magnitude and torque variation, a conjugate cam and a torque reduction cam are used respectively. The conjugate cam eliminates the redundant pre-load by using complementary cam to avoid jumping between a cam and a follower. The torque reduction cam reduces the torque variation by applying opposite torque to a cam shaft. The experimental result shows the reductions of the absolute torque value and torque variation. The improvement of working speed and life span of cam type transfer unit can be expected.

• Korean Institute of Interior Design Journal
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• v.19 no.5
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• pp.113-121
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• 2010

This study aimed to examine academic researches about apartment unit plans and consumer's opinions, and then to analyze the corelationship between the two, thus identifying the differences between the reality of housing market and consumers' opinionsl. On the analysis of the apartment unit plans($66m^2{\sim}164m^2$) provided by top 8 construction companies from March 2004 to December 2008. The remarkable change compared to existing apartments is an increase in the number of bays. This displays construction companies are responding to consumer' opinions actively. However, there were spaces which did not or passively reflect consumer's opinions enough. Especially, front side allocation of bedrooms beside master bedroom, kitchen/dining room and L-D-K & LD-K installation of a door between entrance and a living room. These are opinions that companies need to make efforts to reflect on apartment unit plans as much as possible.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1569-1572
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• 1987

The major objective of this paper is the design of control unit based on the bit slice technique. The branch control unit is device that provides 16-way branch when used in conjuction with the Microprogram Sequencer. The Next address control unit is designed specifically for next address control of the Microprogram Sequencer.

• Journal of the Korean Home Economics Association
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• v.49 no.8
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• pp.113-124
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• 2011

The aim of this study is to conduct an evaluation review of the contents of the career education unit in textbooks on technology and home economics for senior high school freshmen. This study adopted the "Objective & System of Career Education" established by the Korea Research Institute for Vocational Education & Training as the criterion for evaluating the content of career education, and targeted the unit, "Design of Vocation & Careers", which was included in six different textbooks on technology and home economics for senior high school freshmen involving five different publishers. The unit of "Design of Vocation & Careers" was mostly written in three subunits. An analysis of the textbooks by different, publisher showed that every aspect of the "Objective & System of Career Education" was appropriately covered in the unit. This was achieved by means of the elements of contents and illustrations.

• Journal of Information Display
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• v.5 no.1
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• pp.7-15
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• 2004

A highly simplified backlight unit mainly composed of diffractive grating in sub-micron order imprinted light-guide plate (LGP) is proposed for edge-lit backlight unit. Optical characteristics of the imprinted LGP are examined by RCWA and the performance is verified through Monte Carlo simulation. Results show that the diffraction efficiency, luminous flux and its uniformity over the area are significantly affected by the angle of incident ray. Consequently couples of design considerations are additionally proposed to enhance luminous flux. In terms of peak luminance and out-coupling luminous flux, the experimental results are agreed well with the performance simulation. Finally, compared with optical characteristics of conventional backlight unit, we could conclude that the proposed simplified backlight unit made of diffractive grating imprinted light-guide plate is a good substitute for the conventional backlight unit.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.745-748
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• 2008

On investigation about quick measurement technology of unit water at range of W/B=35% in high strength, the average error of the Di-electric constant moisture tester A has measured more than $23.0kg/m^3$ unit water content of design and the average error of the method of unit volume weigh was less than $-9.6kg/m^3$. The average error with mixing factor has influenced with a kind of sand, but had not influenced with unit water content of design. Therefore, it will be for introduce business decide require more than a study about cement, sand, superplasticizer, etc.

• Proceedings of the SAREK Conference
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• 2008.11a
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• pp.605-610
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• 2008

The study aims to analyzed and identify the heat transfer characteristics of heating unit for room using 3-D numerical-analysis in order to design heating unit. The temperature comparison processes were done with various numerical conditions. In addition, the optimal conditions of heating unit design were proposed as inlet temperature, the inlet flow, heater power, and vessel size.

• Journal of the Korean Institute of Telematics and Electronics C
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• v.35C no.3
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• pp.59-68
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• 1998

This paper propose a hardware architecure of multimediasysgem for integrated processing of the multimedia data such as audio and video, and describes on the design and implementation of multimedia integrated processing Unit. The unit comprises most commonly needed multimedia processing function for computer-based video conference: audio-visual datacapture, playback, compression, decompression as well as interleaving/disinterleaving of compressed audio-visual data. The proposed architecture minimizes the CPU overhead that might be caused by multimedia data processing and assures the fluent data flow among system components. Also, this unit is tested and analyzed under the computer-based video conference to confirm the multimedia unit of proposed architecture using communication protocol and application software through Ethernet and FDDI (Fiber Distributed Data Interface) networks.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.1153-1156
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• 1998

We describe a design of a simple but efficient floatingpoint processing architecture expoiting concurrent execution of scalar instructions for high performance in general-purpose microprocessors. This architecture employs 3 stage pipeline asyncronously working with integer processing unit to regulate instruction flows between two arithmetic units.

• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.7 no.2
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• pp.14-20
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• 2011

The end of design lifetime for Wolsong unit 1 will be reached on 20th November in 2012. So the license renewal documents for the continuous operation of Wolsong unit 1 is under reviewing now. Major components of primary system such as pressure tubes, feeder pipes including delayed neutron monitoring system tubing are being replaced and many components of secondary system are also being repaired. In this paper, the assessment on the wear degradation of delayed neutron monitoring system tubing(on the other hand, DN tube was called) was performed for the ageing management of the same component. The wear defects of this component was one of causes that resulted in heavy water leakage accidents. Therefore design specifications of Wolsong uint 1 and heavy water leakage accidents of pressurized heavy water reactors were reviewed and causes of wear defect for DN tubes were analyzed. Wear propagation equations based on the heavy water leakage history were made and the proper repairing time was possible to be expected if the continued operation was considered. Finally design change items of DN tubes that were conducted for the long term operation of Wolsong unit 1 are introduced.