• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.250-252
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• 1996

In this paper, the principle of operation. the part characteristic, characteristic of component movement, analysis are carried out for camcoder iris assembly which is one of the important element component in Video large projection TV instrument, and some Know-how for development of element component is also included. The magnetic field circuit for the small and simple structure with low power consumption is introduced and new materials of yoke for small motor system is suggested. Especially, the relation with remained magnetic field and operation duration time is analyzed by experimental results. Some problems of nonlinear torque characteristics include to obtain the simple and low cost structure in domestic production of element component is analyzed. Furthermore, development procedure is suggested for iris assembly and some methods to reduce the burr with some check points for small precise accessories are explained.

• 한국멀티미디어학회:학술대회논문집
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• 한국멀티미디어학회 2000년도 춘계학술발표논문집
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• pp.117-120
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• 2000

This paper describe VLSL design of crytographic processor which can execute triple DES and DES encryption algorithm. To satisfy flexible architecture and area-efficient structure, the processor has 1 unrolled loop structure without pipeline and can support four standard mode, such as ECB, CBC, CFB, and OFB modes. To reduce overhead of key computation , the key precomputation technique is used. Also to eliminate increase of processing time due to data input and output time, background I/O techniques is used which data input and output operation execute in parallel with encryption operation of cryptographic processor. The cryptographic processor is implemented using Altera EPF10K40RC208-4 devices and has peak performance of about 75 Mbps under 20 Mhz ECB DES mode and 25 Mbps uder 20 Mhz triple DES mode.

• 전기학회논문지
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• 제65권10호
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• pp.1664-1671
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• 2016

This paper presents the analysis of the gate-source voltage of the gallium nitride high electronic mobility transistor (GaN HEMT) in the half bridge structure focused on the mutual effects of two switching operation. Especially low side gate-source voltage is analyzed mathematically according to the high side switch turn-on and turn-off operation. Moreover, the influence of each gate resistance and parasitic component on the switching characteristic of other side switch is investigated, and the formula, simulation and experimental results are compared with theoretical data.

• 전기학회논문지
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• 제62권5호
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• pp.688-695
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• 2013

Networked Control Systems(NCS) contain the structure which controllers, actuators and sensors are connected to communication network. And they have been adopted in large and complicated plant area due to the advantages of mitigating computational bottleneck and maintenance. Although this structure provides many benefits, it brings in problems of unpredictable communication delay, data loss and corruption. This phenomena have to be considered in designing NCSs since it affects on overall control system stability. This paper introduces network traffic test method for ethernet based NCSs to find out maximum network usage which guarantee stable control operation. Test results shows this methods can be adopted in various types of NCSs and contributes economical system design and effective system operation.

• 한국해양공학회지
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• 제19권4호
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• pp.21-27
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• 2005

Large welded structures, including ships and offshore structures, are normally in operation under cyclic fatigue loadings. These structures include many geometric discontinuities, as well as material discontinuities due to weld joints. The fatigue strength at these hot spots is very important for the structural performance. In the past, various Non Destructive Evaluation (NDE) techniques have been developed to detect fatigue cracks and to estimate their location and size. However, an important limitation of most of the existing NDE methods is that they are off line; the normal operation of the structure has to be interrupted, and the device often has to be disassembled. This study explores the development of a structural health monitoring system, with a special interest in applying the technique to welded structural members in ship and offshore structures. In particular, the impedance based structural health monitoring technique that employs the coupling effect of piezoceramic (PZT) materials and structures is investigated.

• 콘크리트학회지
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• 제5권1호
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• pp.175-181
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• 1993

콘크리트 구조체공사의 가장 큰 영향을 미치는 것은 거푸집공사이며, 구조체공사의 합리적 관리는 거푸집공사의 작업생산성에 관한 기초자료를 확보함으로써 가능하다. 본 연구에서는 거푸집공사의 과학적 관리기반을 구축하기 위하여, 구조체 기준층을 대상으로 작업측정을 하여 유로폼공법, 재래식 거푸집공법 등 주요공법의 생산성을 도출하였다. 또한, 거푸집공사의 주요 작업인 조립, 해체, 운반등 단위 공정의 소요작업 품을 산출함으로써, 작업개선을 위한 실용적인 자료를 제시하였다. 마지막으로 거푸집 면적이 생산성과 상관관계가 매우 높다는데 착안하여 소요작업품을 예측할 수 있는 상관관계식을 유도함으로써, 공정관리 및 기능공의 수급예측이 가능토록 하였다.

• 동의생리병리학회지
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• 제31권6호
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• pp.305-312
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• 2017

Theory of visceral and meridian system is the most important part in traditional Korean medicine. In theory of visceral system, the aspect of function has been emphasized more than anatomical substance. In this research, the concept of visceral system would be attempted to be expanded from 'five viscera and six bowels' to whole body, and new analysis system composed of genesis, structure, function and operation. The theories of traditional Korean medicine remain at the organ system or organ level, therefore progressive research using the new analysis system is needed to approach tissue and cell levels.

• 한국도로학회논문집
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• 제19권6호
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• pp.117-127
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• 2017

PURPOSES : The objective of this research is establishing system components and optimizing operational procedures in order to systematically manage road cave-ins in urban areas. METHODS : Based on the literature review and alternative comparison, optimization methods is suggested. RESULTS : Throughout the study, location referencing system, database structure, and operation strategy(procedure) were clarified, and the optimization methods for each item were suggested. CONCLUSIONS : Road cave-in management should be focused on user safety rather than focusing on economic aspects. The occurrence of road cave-in should be addressed thoroughly by road management system(location referencing system, database structure, and operation strategy(procedure), and the optimization methods), since they are closely related to road users' safety.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.232-237
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• 2006

Operation deflection shapes(ODS) is defined as a motion of structure at particular frequency. The ODS is eligible to show any types of structural motions while the modes supply solutions only to linear and stationary motion. The principal vibration source of an auto teller machine(ATM) case was occurred due to resonance which was found by modal analysis. To reduce the vibration of ATM case, the motion of the case was visualized using ODS analysis, which can suggest how to modify the structure. As a result the vibration of the ATM case was greatly reduced with a stiffening bar between the opposite plates.

• 한국통신학회논문지
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• 제22권7호
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• pp.1403-1410
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• 1997

Because streaming mode connection server suitable to wide area ATM networks performs transmission, reception and lookup with time restriction for the transmission time of a cell, it has demerits of large cell loss incase that burst traffic occurs. Therefore, in this paper to decrease cell loss we propose a high speed CAM (Content Addressable Memory) which is capable of processing data of streaming mode connections server at a high speed. the proposed CAM is applied to forwarding table VPC map which performs function to output connection numbers about input VPI(Virtual Path Identifier)/VCI(Virtual Channel Identifier). The designed high speed CAM consist of DBL(Dual Bit Line) CAM structure performed independently write operation and match operation and two-port SRAM structure. Also, its simulation verification and full-custom layout is performed by Hspice and Composs tools in 0.8 .$\mu$m design rule.