• Journal of IKEEE
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• v.27 no.4
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• pp.368-378
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• 2023

Automotive headlamp with LED matrix exploits low-cost low-speed serial buses such as I2C and SPI for digital LED control. When headlamp resolution increases, LED control data significantly increases to exceed capacity of control bus. This paper proposes HLCP (Headlamp LED Control Protocol), a novel LED maxtrix headlamp protocol. The proposed protocol exploits dedicated instructions to control many LEDs simultaneously, so it can control much more LEDs than conventional control buses although it is basically based on I2C bus. It is designed and verified in Verilog HDL. Simulation results show that HLCP can control LED matrix headlamp more efficiently than I2C and SPI.

• Journal of the Korean Society of Clothing and Textiles
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• v.31 no.12
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• pp.1710-1720
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• 2007

Environmental changes, including intensive international competition, unpredictable consumer demand, and market trends of variety and short product life cycles, have compelled the U. S. textiles and apparel industry to focus increasingly on the consumer as a way to meet these challenges. The industry began expanding into mass customization that used information technology, flexible processes, and organizational structures to deliver a wide range of products and services that met specific needs of individual customers but on a mass scale. This paper presents cases of leading-edge technology application on customization and breakthrough concepts in personalization, with a view to raising the level of debate on these issues to its highest level.

• Plant Journal
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• v.11 no.3
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• pp.32-45
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• 2015

중동지역을 필두로 하여, 국내건설사들은 시공분야에서의 높은 경쟁력을 바탕으로 매년 놀라운 속도로 해외 플랜트 EPC 건설시장에서의 점유율을 높여 나가고 있다. 2012년에는 전 세계 건설시장의 8.1%를 점유하며, 이탈리아를 제치고 역대 최고인 세계 6위의 건설 강국으로서의 면모를 과시하기도 하였다. 그럼에도 불구하고, 그간 수주 자체를 목적으로 한 저가입찰 등과 같이 리스크를 간과한 무리한 수주는 폭탄의 뇌관을 건드리는 격이 되었고, 결국 2013년 일부 대형 건설업체들은 해외 사업장에서 대규모 손실을 경험하였다. 이와 더불어, 해외 대규모 EPC 플랜트 사업의 수주금액이 급증하여 한 개의 사업에서 발생되는 손실이 기업의 총체적 경영에도 큰 영향을 미칠 수 있게 됨에 따라, EPC 플랜트 건설사업의 잠재 손실의 원인을 최소화하고 건설사들의 지속적인 성장을 가능하게하기 위해서 리스크를 효율적으로 관리해야 하는 필요성은 더욱 증가하였다. 따라서, 본 연구에서는 해외건설시장 중, 중동지역에서 EPC 형태로 발주되는 발전플랜트 건설사업의 리스크 요인들을 발굴하고, AHP (Analytic Hierarchy Process) 기법을 사용하여 리스크 요인들 간의 우선순위를 정량적으로 도출하여, 국내건설사들이 중동지역의 EPC 사업수행 현장에서 효율적으로 리스크를 관리할 수 있도록 도움을 주고자 하였다.

• Journal of Distribution Science
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• v.5 no.2
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• pp.101-117
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• 2007

Recently, in the process of distribution industry's growth, distribution environment is changing rapidly by appearance of new business condition and strategy of multiple store. According to the intensification of competition, recently large discount stores are developing private brand(PB) products for the purpose of product differentiation and profitability. But after the economic crisis in 1997, young housewives and salaried man's that have rational and practical buying pattern become the core consumer's in the large discount stores. Hence low price strategy is not new things for the consumer's anymore. In addition to, acquiring new consumer, many discount stores are establishing new stores at the rural area. But they undergo hardships of establishing new stores at the rural area because of disparity consumer's behavior, income level and consumption's pattern among regions. So, when they try to establish new stores, they need to know consumer's behavior at the region. Therefore the purpose of this study is to analyze preference property for the private brand(PB) of large discount stores in Gyeonggi-Do.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.38 no.8
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• pp.62-71
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• 2001

This paper presents a design of the real-time digital image enhancement preprocessor for CMOS image sensor. CMOS image sensor offers various advantages while it provides lower-quality images than CCD does. In order to compensate for the physical limitation of CMOS sensor, the spatially adaptive contrast enhancement algorithm was incorporated into the preprocessor with color interpolation, gamma correction, and automatic exposure control. The efficient hardware architecture for the preprocessor is proposed and was simulated in VHDL. It is composed of about 19K logic gates, which is suitable for low-cost one-chip PC camera. The test system was implemented on Altera Flex EPF10KGC503-3 FPGA chip in real-time mode, and performed successfully.

• Korean Journal of Optics and Photonics
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• v.29 no.6
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• pp.241-246
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• 2018

In this paper, a low-cost optical temperature sensor is implemented, using a fiber Bragg grating (FBG) as the temperature probe and a low-cost VCSEL with temperature-dependent output wavelength as the light source. To analyze the wavelength of the reflected light from the FBG, an interrogation was applied using a method of referring to the internal temperature according to the output wavelength of the VCSEL. When the temperature of the VCSEL was adjusted from 14 to $52.2^{\circ}C$, the output wavelength varied from 1519.90 to 1524.25 nm. The degree of wavelength tuning according to temperature was $0.114nm/^{\circ}C$. The variable wavelength repeatability error according to temperature was ${\pm}0.003nm$, and the temperature measurement error was ${\pm}0.18^{\circ}C$. As a result of measuring the temperatures from 22.3 to $194.2^{\circ}C$, the value of the internal temperature change of the light source according to the applied temperature ${\Delta}T$ was $0.146^{\circ}C/{\Delta}T$, the change in reflected wavelength of the temperature probe according to applied temperature ${\Delta}T$ was measured at $16.64pm/^{\circ}C$. and the temperature measurement error of the sensor was ${\pm}1^{\circ}C$.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.7
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• pp.4463-4468
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• 2014

To increase the efficiency of a solar module, the development of solar concentrator using a lens or reflection plate is being proceeded actively and the concentrator pursues the a concentration using a lens or an optical device of a concentration rate and designing as a solar tracking system. On the other hand, as the energy density being dissipated as a heat according to the concentration rate increases, the cares should be taken to cool the solar concentrator to prevent the lowering of efficiency of solar cell by the increasing temperature of the solar cell. This study, researched and developed an economical concentrator module system using a low priced reflection optical device. A concentrator was used as a general module to increase the generation efficiency of the solar module and heat generated was emitted by the concentration through the cooling system. To increase the efficiency of the solar concentrator, the cooling system was designed and manufactured. The features of the micro cooling system (MCS) are a natural circulation method by the capillary force, which does not require external power. By using the potential heat in the case of changing the fluid, it is available to realize high performance cooling. The 117W solar modules installed on the reflective plate and the cooling device in the cooling module and the module unit was not compared. The cooling device was installed in the module resulted in a 28% increase in power output.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.39 no.3
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• pp.98-109
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• 2002

Bluetooth technology is a publicly available specification proposed for Radio Frequency (RF) communication for short-range :1nd point-to-multipoint voice and data transfer. It operates in the 2.4㎓ ISM(Industrial, Scientific and Medical) band and offers the potential for low-cost, broadband wireless access for various mobile and portable devices at range of about 10 meters. In this paper, we describe the structure and the test results of the bluetooth baseband module with direct memory access method we have developed. This module consists of three blocks; link controller, UART interface, and audio CODEC. This module has a bus interface for data communication between this module and main processor and a RF interface for the transmission of bit-stream between this module and RF module. The bus interface includes DMA interface. Compared with the link controller with FIFOs, The module with DMA has a wide difference in size of module and speed of data processing. The small size module supplies lorr cost and various applications. In addition, this supports a firmware upgrade capability through UART. An FPGA and an ASIC implementation of this module, designed as soft If, are tested for file and bit-stream transfers between PCs.

• Journal of the Microelectronics and Packaging Society
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• v.22 no.4
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• pp.57-63
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• 2015

In order to prepare a low-cost conductive filler material possessing improved anti-oxidation property, Ag-coated Cu flakes were fabricated and the effects of an applying method of ammonium-based pretreatment solution on the Cu flakes were analyzed. The pretreatment solution was used to remove the surface oxide layer on Cu flake. During a single-stage pretreatment process, hole-shaped defects were formed on the flake surface during the pretreatment after 2 min, and the number and size increased in proportion to the pretreatment time. In the case that Ag plating solution was injected in the pretreatment solution after the pretreatment for 2 min, the defects were also formed during Ag plating. In contrast, the defects tremendous decreased in the case that the pretreatment solution was removed after the first pretreatment for 2 min and the Ag plating proceeded after the second pretratment using a low concentration pretreatment solution. As the final result, the 15 wt% Ag-coated Cu flake sample which was fabricated using the single-stage pretreatment oxidized at $166^{\circ}C$, but the sample fabricated by the double-stage pretreatment oxidized at $224^{\circ}C$, indicating definitely improved anti-oxidation property.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.11
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• pp.32-40
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• 2016

IEEE 802.15.4 is the one of the protocols for radio communication in a personal area network. Because of low cost and low power communication for IoT communication, it requires the highest optimization level in the implementation. Recently, the studies of location aware algorithm based on IEEE802.15.4 standard has been achieved. Location estimation is performed basically in equal consideration of reference node information and blind node information. However, an error is not calculated in this algorithm despite the fact that the coordinates of the estimated location of the blind node include an error. In this paper, we enhanced a conventual maximum likelihood estimation using weighted coefficient and implement the hardwired location aware engine for small code size and low power consumption. On the field test using test-beds, the suggested hardware based location awareness method results better accuracy by 10 percents and reduces both calculation and memory access by 30 percents, which improves the systems power consumption.