• Electronics and Telecommunications Trends
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• v.17 no.4 s.76
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• pp.123-134
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• 2002

ISO/IEC14443-1(1), ISO/IEC10536-1(2), 그리고 ISO/IEC15693-1(3)에서 정의하고 있는 비접촉식 카드의 교류전기장 및 교류자기장에 대한 내성력 시험에 대해 살펴보고자 한다. 상기 규격은 ISO/IEC JTC1 기술위원회의 SC17에서 다루고 있으며, 아직 상기 표준 규격은 초안 상태에 있어 상세한 시험 방법에 대한 규격이 마련되어 있지 않은 실정이다. 그럼에도 불구하고 칩 카드 수입국은 수출업자에게 교류전기장 및 교류자기장 내성시험을 요구하고 있다. 따라서 업계에서는 시험 시설, 시험 방법, 시험 절차, 시험 평가 부분에서 많은 혼란이 발생되고 있다. 이러한 시험에 대한 대응책이 국가적 차원에서 시급히 마련되어야 할 것이다. 본 고에서는 이를 위한 일련의 과정으로서, 칩 카드 관련 국제 규격(1)-(5) 동향을 살펴보고, 교류전기장 및 교류자기장 내성력 시험 절차를 마련하기 위한 관점에서 IEC61000 시리즈 중에서 RF 복사 내성시험인 IEC61000-4-3(6), IEC61000-4-8, IEC61000-4-9, IEC61000-4-10, IEC61000-4-23(7)에 대한 분석을 동시에 실시하였다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2002.11a
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• pp.219-223
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• 2002

본 연구에서는 한국인 인체 자료를 바탕으로 감성환경에 적용하기 위한 기계류 안전에 대한 설계 및 측정 자료의 DB를 구축하고 인간공학적으로 평가하였다. 연구 내용은 기계류 안전에 대한 국제 표준 규격(ISO 15534)과 관련된 총 23가지의 인체 치수 자료이다. 유럽인을 모집단으로 하여 측정된 표준 규격에 비해 일치하지 않거나 측정에서 누락된 한국인 자료에 대해 몇몇 가정을 통해 수정함으로써 표준 규격에 상응하는 한국인 인체 자료를 생성시키는 기법을 개발하였다.

• Proceedings of the Safety Management and Science Conference
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• 2000.05a
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• pp.217-224
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• 2000

건축물의 인조석 외장재를 생산하고 업체의 품질분석을 하기 위한 연구과제이다. 인조석은 자연석과 동일한 구성성분으로 거의 완벽한 자연석 그대로의 자연스러운 질감과 아름다움이 함께 하며 다양한 종류의 패턴과 세련된 색상 그리고 품위 있는 질감으로 최상급 건축마감재로 선택되어지고 있다. 하지만, 고유기술 및 관리기술의 미흡으로 제작과정 자체가 원시적이며, 제품의 신뢰성 자체를 객관적으로 보증 받을 수 있는 기준이 마련되어 있지 않다. 그리고 본사에서 생산하고 있는 외장재용 인조석은 KS규격도 전혀 이루어져 있지 않을 뿐만 아니라, 자체 시험 자료가 전혀 이루어져 있지 않는 관계로 새로운 로트를 장착했을 때 골재, 안료 및 혼화재 간의 배합비를 어떻게 구성하여야 할 것인가를 순수 기술자의 know-how에만 의존해야 하는 실정이다.

• The Journal of the Petrological Society of Korea
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• v.21 no.2
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• pp.263-275
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• 2012

Jurassic Daebo biotite granites, known as one of the main stone resources in the country, are widely and away distributed in the Pocheon and Yangju areas of the mid Gyeonggi massif. The objects of the study are mainly to reveal the unique characteristics of grain size, rock color, mineral composition, physical property and fracture system from the above biotite granites. Biotite granites from the Pocheon area (PG) and Yangju area (YG) are represented by coarse-grained and light gray, and medium to coarse-grained and grayish to light gray, respectively. In modes, main minerals of Qz+Af+Pl (quartz+alkali feldspar+plagioclase) are more increased in the PG, and accessories of biotite are more increased in the YG, which differences can cause the PG more bright light gray than the YG. Specific gravity (SG) shows somewhat more increasing in the YG than the PG. These differences can be caused by more increasing in biotite contents of higher specific gravity compared to the major minerals in the former than the latter. Absorption ratio (AR) and porosity (PR) of the PG and YG show the same values of 0.33 % and 0.86 %, respectively. In the correlations, PR vs SG and AR vs PR show gradually negative and distinctly positive trends, respectively. Compressive strength (CS) and tensile strength (TS) show increasing in the PG (CS: 1,775 $kg/cm^2$, TS: 87 $kg/cm^2$) than the YG (CS: 1,647 $kg/cm^2$, TS: 79 $kg/cm^2$). These strength characteristics could be attributed to the inherent rock textures of them. Abrasive hardness (AH) also shows a little increasing in PG, which can be caused by increase in quartz contents having higher hardness than the other major minerals. Orientations of fracture sets from the PG and YG were compared with those of vertical rift and grain planes in Mesozoic granites of the country. From the overlapped diagram, the distribution pattern between fracture sets and above vertical planes suggests that microcrack systems developed in Mesozoic granites in Korea occur also in the Daebo biotite granite bodies of the mid Gyeonggi massif. From the relation diagram showing the characteristics of fracture patterns for the above two area, PG and YG may have more potentiality for dimension and non-dimension stone resources, respectively.

• The Journal of the Petrological Society of Korea
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• v.13 no.3
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• pp.161-177
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• 2004

The Cretaceous pink granites of the finan area, southwestern Ogcheon belt, are adjacently developed in the eastern part (Keg) and western part (Kwg) as stocks, respectively. Keg of rounded shape occur as mainly medium-coarse grained rocks, whereas Kwg of ellipsoidal shape occurs as medium-coarse grained ones with partly porphyritic and fine-grained textures. Miarolitic cavities of them are often seen and can be observed more frequently in Kwg than Keg. Rose and counter fracture diagrams of the two granites show that Keg and Kwg have more potentiality of non-dimension and dimension to non-dimension stones, respectively. Physical properties such as porosity and absorption ratio have 0.25% and 0.65％, and 0.43% and 1.11%, respectively, which could suggest that emissions of gas phase at later magma stages are abundant in Kwg than those of Keg. From the major and trace elements petrochemisoy, they belong to acidic, peraluminous and calc-alkaline rocks, showing that Kwg are later product than Keg of the same granitic parent magma. REE concentrations normalized to chondrite value have trends of gradual and parallel enriched LREE and depleted HREE. Eu negative anomalies of Kwg are far more severe than those of Keg, which suggest that plagioclase fractionation in Kwg was much stronger than that of Keg. In the magnetic susceptibility vs. petrochemical and modal parameters, they all belong to magnetite-series and I-types, and can be classified as weakly-moderately ferromagnetic rocks. And the above relations could suggest that their susceptibility values are more mainly depended on ferromagnetic opaques than ferromagnetic and paramagnetic assemblages (Bt ＋ Ch ＋ Ser ＋ Op).

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.7
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• pp.805-811
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• 2010

When we design a product, we spend a considerable amount of time in designing fasteners and their mating parts. Fasteners have special features because of which they are widely used and well standardized. Although we use some equations to design the fasteners, we should select these fasteners from the standardized table. In order to design them quickly using the CAD system, we proceeded as follows. First, we prepared some standardized shapes of fasteners to design them automatically. Next, we built a database of some fasteners such as a tension bolt, lock wire, thread, pin, and snap ring. Then, we used the design equations to quickly and precisely calculate the various parameters. Finally, we used a configuration design method to generate the shapes automatically using the results of the calculation and the values retrieved from the database. We applied this approach to the design of a propulsion structure, and demonstrated that this approach worked well and saved considerable time.

• Electronics and Telecommunications Trends
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• v.31 no.4
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• pp.65-76
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• 2016

특정 제조사의 단말 또는 운영체제에 의존성이 없는 플랫폼 독립적인 웹은 높은 이식성, 소프트웨어의 재활용, 개발 생산성, 풍부한 개발자 존재, 유지 보수 면에서 장점을 가지나, 화려한 UI/UX를 제공하는 네이티브 응용에 비해 낮은 성능으로 웹 기반의 응용 개발 및 보급이 크게 활성화되지 못했다. 한편 데스크톱은 물론 모바일 단말의 멀티코어 기반 Graphic Processing Unit(GPU), CPU 탑재 등 HW 고사양화와 웹 응용에서도 HW 가속 기능을 활용할 수 있는 표준 제공으로 성능 제약을 극복할 수 있게 되었다. 본고에서는 GPU 발전동향을 살펴보고, 고속 렌더링 및 병렬 연산처리를 요구하는 웹 응용이 GPU기반 HW 가속 기능을 활용할 수 있는 크로노스 그룹의 그래픽 가속(Web Graphics Library: WebGL) 및 컴퓨팅(Web Computing Language: WebCL) 지원 표준 규격을 정리한다. 또한, 최근 차세대 GPU Application Programming Interface(API)로 발표된 Vulkan에 대해 알아보고, 웹 고속화 기술에 적용 가능성에 대해 전망한다.

• The Journal of the Petrological Society of Korea
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• v.16 no.3
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• pp.144-161
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• 2007

The studied Nangsan area is widely covered by the Jurassic biotite granodiorite, which is mainly light grey in color and medium-grained in texture. Results of the regional fracture pattern analysis for the granodiorite body are as follows. Strike directions of fractures show three dominant sets in terms of frequency order. The sets are in an order of a (1) $N80^{\circ}{\sim}90^{\circ}E$ (1st-order)>(2) $N70^{\circ}{\sim}80^{\circ}E$ (2nd-order)>(3) $NS{\sim}N10^{\circ}E$ (3rd-order). Spacings of the fractures are mostly predominant in less than 200 cm. Therefore, the granodiorite of the area has more potential for non-dimensional stones than dimension ones. And orientations of vertical quarrying planes can be also divided into two groups in terms of frequency $N14^{\circ}W{\sim}N16^{\circ}E$ (1st-order) and (2) $N78^{\circ}E{\sim}N88^{\circ}E$ (2nd-order). The orientations of the two groups are more or less different from those of the regional fracture patterns. These can be mainly attributed to the preferred orientations of microcrack developed in the quarries. Of physical properties, specific gravity, absorption ratio, porosity, compressive strength, tensile strength and abrasive hardness are 2.65, 0.28%, 0.73%, $1,628kg/cm^2,\;100kg/cm^2$ and 31, respectively. Contrary to the porosity, both granites of the Nangsan and Sogrisan areas show almost similar values of the abrasive hardness. These can be explained by the differences of Qz+Af modes, which can be regarded as an index for abrasive resistance. Meanwhile, it is anticipated that comprehensive understanding of the orientations of vertical quarrying planes and characteristics of various physical properties will be utilized as an important information for stone resources.

• Korean Journal of Poultry Science
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• v.17 no.4
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• pp.303-309
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• 1990

In order to study the effect of diet supplemented with 0.015% (150ppm) of L-tryptophan on the performance of broiler breeder, the performance of parent stock of 1768 breeder(Hubbard) fed on the diet supplemented with L tryptophan was compared with those of 1105 breeders fed on the basal (control) diet Henday egg and settable egg production, fertility, hatchability and number of quality chicks per settable egg were recorded during 133 days(34－52 week－old) of experimental feeding period. Also during 28 days of after experimental feeding period(53－56 week－old) the henday egg and settable egg production were recorded. The henday egg production of breeder fed L-tryptophan was similar with that fed the control diet during 7 weeks of the peak laying period(34－41 week－old) after beginning of the experimental feeding but which was significantly(P＜0.05) higher during 84 days of the post peak laying period(41－52 week－old) and 28 days of after experimental feeding period(53－56 week－old) than those of control And birds fed the L-tryptophan layed significantly (P＜0.01) higher numbers of the sellable eggs than those fed control diet during the post peak laying and after experimental feeding periods. While the coefficient of variance for the henday egg and settable egg production were shown lower values in birds fed the diet supplemented with L-tryptophan compared with those fed the control diet Also the diet containing L-tryptophan did not affect fertility and hatchability of settable egg though the number of quality chicks per sellable egg was higher significantly(P＜0.05) in birds fed the L-tryptophan than that fed the control diet.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2008.06a
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• pp.322-324
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• 2008

재난재해 등 긴급 상황이 발생했을 때 신속한 대응 체계 수립을 위해 비 접근 및 난접근 지대, 목표물 감시대상지역에 대한 공간정보를 신속하게 취득할 수 있는 실시간 공중모니터링 체계의 구축이 시급한 실정이다. 이에 본 연구에서는 긴급한 재난 상황과 혹은 이와 유사한 여러 상황에 신속하고 유연하게 운용될 수 있는 무인헬기 기반의 실시간 공중 모니터링 체계에 적용할 멀티 센서 시스템의 설계를 목표로 한다. 이를 위해 먼저 실시간 공중모니터링 임무 및 운용 시나리오를 크게 4가지로 설정하고 이에 적합한 디지털 카메라, 레이저 스캐너, GPS/IMU 및 무인헬기 플랫폼의 요구사항을 각각 도출하였다. 또한, 기술 동향 및 규격 조사결과를 바탕으로 도출된 요구사항에 가장 적합한 각각의 센서 및 플랫폼을 선정하였다. 마지막으로 시스템 설계의 최적화를 위하여 시뮬레이션을 통해 설정된 임무에 부합하는 품질의 공간정보 성과물이 선정된 멀티센서 시스템으로부터 취득 가능한가를 검증하였다. 본 연구를 통해 소형무인헬기기반의 멀티 센서시스템에 대한 최적 설계의 방법론을 정립할 수 있었고, 향후 설계의 결과는 임무로부터 도출된 요구사항에 최적화된 맞춤형 시스템 구축에 적용들 예정이다.