• Title/Summary/Keyword: Sub-parts

검색결과 703건 처리시간 0.046초

Giga-Hertz-Level Electromagnetic Field Analysis for Equivalent Inductance Modeling of High-Performance SoC and SiP Designs

  • Yao Jason J.;Chang Keh-Jeng;Chuang Wei-Che;Wang, Jimmy S.
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제5권4호
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    • pp.255-261
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    • 2005
  • With the advent of sub-90nm technologies, the system-on-chip (SoC) and system-in-package (SiP) are becoming the trend in delivering low-cost, low-power, and small-form-factor consumer electronic systems running at multiple GHz. The shortened transistor channel length reduces the transistor switching cycles to the range of several picoseconds, yet the time-of-flights of the critical on-chip and off-chip interconnects are in the range of 10 picoseconds for 1.5mm-long wires and 100 picoseconds for 15mm-long wires. Designers realize the bottleneck today often lies at chip-to-chip interconnects and the industry needs a good model to compute the inductance in these parts of circuits. In this paper we propose a new method for extracting accurate equivalent inductance circuit models for SPICE-level circuit simulations of system-on-chip (SoC) and system-in-package (SiP) designs. In our method, geometrical meshes are created and numerical methods are used to find the solutions for the electromagnetic fields over the fine meshes. In this way, multiple-GHz SoC and SiP designers can use accurate inductance modeling and interconnect optimization to achieve high yields.

다단계 제품 구조를 고려한 유연 잡샵 일정계획의 Large Step Optimization 적용 연구 (Large Step Optimization Approach to Flexible Job Shop Scheduling with Multi-level Product Structures)

  • Jang, Yang-Ja;Kim, Kidong;Park, Jinwoo
    • 한국지능정보시스템학회:학술대회논문집
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    • 한국지능정보시스템학회 2002년도 춘계학술대회 논문집
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    • pp.429-434
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    • 2002
  • For companies assembling end products from sub assemblies or components, MRP (Material Requirement Planning) logic is frequently used to synchronize and pace the production activities for the required parts. However, in MRP, the planning of operational-level activities is left to short term scheduling. So, we need a good scheduling algorithm to generate feasible schedules taking into account shop floor characteristics and multi-level job structures used in MRP. In this paper, we present a GA (Genetic Algorithm) solution for this complex scheduling problem based on a new gene to reflect the machine assignment, operation sequences and the levels of the operations relative to final operation. The relative operation level is the control parameter that paces the completion timing of the components belonging to the same branch in the multi-level job hierarchy. In order to revise the fixed relative level which solutions are confined to, we apply large step transition in the first step and GA in the second step. We compare the genetic algorithm and 2-phase optimization with several dispatching rules in terms of tardiness for about forty modified standard job-shop problem instances.

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자기조직화 신경망에 근거한 2단계 기계-부품 그룹형성 알고리듬 (Two-phase Machine-Part Group Formation Algorithm Based on Self-Organizing Maps)

  • 이종섭;전용덕;강맹규
    • 대한산업공학회지
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    • 제28권4호
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    • pp.360-367
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    • 2002
  • The machine-part group formation is to group the sets of parts having similar processing requirements into part families, and the sets of machines needed to process a particular part family into machine cells. The purpose of this study is to develop a two-phase machine-part group formation algorithm based on Self-Organizing Maps (SOM). In phase I, it forms machine cells from the machine-part incidence matrix by means of SOM whose output layer is one-dimension and the number of output nodes is the twice as many as the number of input nodes in order to spread out the input vectors. In phase II, it generates part families which are assigned to machine cells by means of machine ratio related with processing part and it gives machine-part group formation. The proposed algorithm performs remarkably well in comparison with many well-known algorithms for the machine-part group formation problems.

잡음이 존재하는 채널에서 이용되는 분류 벡터 양자화 코드북의 인덱스할당기법 (Optimization of CVQ codebook index for noisy channels)

  • 한종기;김진욱
    • 한국통신학회논문지
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    • 제28권3C호
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    • pp.315-326
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    • 2003
  • 본 논문은 분류 벡터 양자화(CVQ)기법을 이용한 통신 시스템에서 채널 오류를 감소시키기 위한 인덱스벡터할당 방식을 다루고 있다. 제안된 시스템은 크게 내부 인덱스 할당방식(IIA inner index assignment)과 교차인덱스 할당방식(CIA : cross index assignment)으로 구성된다. IIA는 부(Sub)코드북 내에서 유사한 코드벡터들에 Hamming거리가 가까운 인덱스들을 할당함으로써 채널에러에 의해 발생된 화질저하를 감소시킨다. CIA는 인덱스 벡터의 클래스 정보를 나타내는 클래스 비트에 발생하는 채널 오류의 영향을 최소화할 수 있는 방법으로서 IIA에 의해 할당된 인덱스 벡터들을 수정한다. 본 논문에서 실시된 컴퓨터 모의실험은 제안된 시스템이 채널 부호화기법을 사용하지 않고도 채널 잡음을 극복할 수 있음을 보여준다.

백신 전달기술 개발 동향과 과제 (Development of Vaccine Delivery System and Challenges)

  • 정형일;김정동;김미루;마니타 당골
    • KSBB Journal
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    • 제25권6호
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    • pp.497-506
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    • 2010
  • Vaccine is a protective clinical measure capable of persuading immune system against infectious agents. Vaccine can be categorized as live attenuated and inactivated. Live attenuated vaccines activate immunity similar to natural infection by replicating living organisms whereas inactivated vaccines are either whole cell vaccines, eliciting immune response by killed organisms,or subunit vaccines, stimulating immunity by non-replicating sub cellular parts. The components of vaccine play a critical role in deciding the immune response mediated by the vaccine. The innate immune responds against the antigen component. Adjuvants represent an importantcomponent of vaccine for enhancing the immunogenicity of the antigens. Subunit vaccines with isolated fractions of killed and recombinant antigens are mostly co-administered with adjuvants. The delivery system of the vaccine is another essential component to ensurethat vaccine is delivered to the right target with right dosage form. Furthermore, vaccine delivery system ensures that the desired immune response is achieved by manipulating the optimal interaction of vaccine and adjuvantwith the immune cell. The aforementioned components along with routes of administration of vaccine are the key elements of a successful vaccination procedure. Vaccines can be administered either orally or by parenteral routes. Many groups had made remarkable efforts for the development of new vaccine and delivery system. The emergence of new vaccine delivery system may lead to pursue the immunization goals with better clinical practices.

상압 공기역학적 렌즈의 입자 관성집속 모델 (Model for the Inertial Focusing of Particles Using an Atmospheric Aerodynamic Lens)

  • 이진원;이민영
    • 대한기계학회논문집B
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    • 제25권3호
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    • pp.315-321
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    • 2001
  • Aerodynamic lenses are widely used in generating particle beams of high density and small diameter, but analytical or modeling studies are limited only in the free molecular regime. In this study, it is shown that generating particle beam is also possible in atmospheric pressure range, and the mechanism of generating particle beam using an orifice is analysed into three different parts : fluid dynamic contraction, diffusional defocusing, and inertial focusing. In laminar flow conditions, the diffusional defocusing effect can be neglected, and the effects of inertial focusing can be expressed in terms of the orifice size and Stokes number. Numerical experiments are done for two different orifices, d/D=1/5 and 1/10 and particle diameter d(sub)p=1-10 ㎛. The results for two different orifices can be made into a single curve when a modified Stokes number is used. The inertial focusing effect diminishes when the modified Stokes number becomes smaller than 10(sup)-2.

소형 선박용 디젤엔진의 수냉식 열교환기 해석 연구 (Study on Simulation of Water Cooling Heat Exchanger for Small Marine Diesel Engine)

  • 양영준;심한섭
    • 한국기계가공학회지
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    • 제11권6호
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    • pp.201-207
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    • 2012
  • This study was carried out to improve the design of heat exchanger for small marine diesel engine. As air pollutants emitted from small marine diesel engine become international problem, IMO(International Marine Organization) tried to establish severe regulations for NOx reduction. The formation of NOx is affected by cooling system, for instance, such as intercooler, heat exchanger, exhaust manifold, and therefore cooling systems are one of essential parts for design of small marine diesel engine. In this study, heat exchanger for small marine diesel engine was modeled and simulated using CATIA V5R19 and ANSYS FLUENT V.13. Thermal flow simulation for heat exchanger was performed to find the optimal design. As the results, maximum velocity of engine coolant in shell inside was 9.1m/s and it was confirmed that outlet temperature and temperature drop for engine coolant could be calculated by simulating proportional relations of temperature between engine coolant and sea water.

500Ps급 상용차량 디젤엔진을 이용한 선박용 디젤엔진 개발 연구 (A Study for Development of a Marine Diesel Engine from a 500Ps Commercial Vehicle Diesel Engine)

  • 심한섭
    • 한국기계가공학회지
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    • 제12권6호
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    • pp.125-131
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    • 2013
  • This study was carried out to develop a diesel engine for marine propulsion. This marine diesel engine was developed based on a 500Ps vehicle diesel engine. Many main parts, such as the intercooler, radiator, and engine controller were designed for the marine diesel engine. The intercooler was designed to be of sea water cooling type; inlet air is cooled by sea water. Engine coolant is cooled by sea water in the radiator too. The water cooling heat exchanger has high cooling performance. In the cooling system, consists of the intercooler and the radiator, the sea water passes through the intercooler and then the radiator, in sequence. This process is very effective compared to the reverse method in which sea water passes through the radiator and then the intercooler, in sequence. The control performance of the engine controller and the fuel injection rate were improved using an engine speed controller. This system was tested on an engine dynamometer and an exhaust gas analyzer using the marine diesel engine test method. Test results show that the 500Ps marine diesel engine satisfied the IMO NOx regulations; Tier II.

자율섭취기능을 갖는 바퀴구동형 생체모방로봇 개발 (Development of a Biomimetic Wheeled Robot with Autonomous Eating Functionality)

  • 조익진;이연정
    • 제어로봇시스템학회논문지
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    • 제12권6호
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    • pp.573-579
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    • 2006
  • Most of the recently developed robots are human friendly robots which imitate an animal or human such as entertainment robot, biomimetic robot and humanoid robot. Interest in these robots is increased because the social trend is focused on health, welfare, and graying. By these social backgrounds, robots become more human friendly and suitable or home or personal environment. The more biomimetic robots resemble living creature, the more human feels familiarity. Human feels close friendship not only when feeding a pet, but also when watching a pet having the food. Most of entertainment robots and pet robots use internal-type batteries and have a self-recharging function. Entertainment robots and pet robots with internal-type batteries are not able to operate during charging the battery. So far there have been a few robots that do not depend on an internal battery. However, they need a bulky energy conversion unit and a slug or foods as an energy source, which is not suitable for home or personal application. In this paper, we introduce a new biomimetic entertainment robot with autonomous eating functionality, called EPRO-1(Eating Pet RObot version 1). The EPRO-1 is able to eat a food (a small battery), by itself and evacuate. We describe the design concept of the autonomous eating mechanism of the EPRO-1, characteristics of sub-parts of the manufactured mechanism and its control system.

20세기 서양 패션에 나타난 동양 복식의 형태미에 관한 연구(I) -보그(Vogue)지를 중심으로- (The Form of Oriental Dress Depicted on the 20th Century Western Fashion(I) -Selected from Vogue-)

  • 김윤희
    • 대한가정학회지
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    • 제29권1호
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    • pp.1-12
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    • 1991
  • The purpose of this study was to identify external form and internal symbolism of oriental dress on the 20th century western fashion. Documentary studies and objective studies were done with descriptive, inductive and content analytic methods. In documentary research, concepts about culture, dress as a cultural sub-system, the from of dress, and the gender symbolism of dress were reviewed. In objective research, oriental fashion photographs in $\ulcorner$Vogue$\lrcorner$ during 1969-1989 were selected and analyzed, for the descriptions of samples, the form of dress, the perception of waist parts, the dressing manner. The synthetic results were as followes; 1. There were the geographical and national terms such as east, Orient, China, India, Japan, and so on in the descriptions of samples; and there were the costume terms such as herem, kimono, pyjama or pajama, sarong, and so on in the descriptions of samples. 2. The from of oriental dress on the 20th century western fashion was identified with draped type. This can be interpreted that in orient, there was no desire to reveal body figure through dress, therefore, for the long time, sustaining draped type of dress has been. 3. The perception of waist part in oriental dress on the 20th century western fashion was not made. So, it can be interpreted that in orient, there was no desire to distinguish both sexes through the emphasis of waist part in dress. 4. The dressing manners of oriental dress on the 20th century western fashion were wearing of trouser and layering mainly, symbolizing the confusion of gender distinction through dress.

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