• Progress in Superconductivity and Cryogenics
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• v.1 no.1
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• pp.22-27
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• 1999

Recently, small-sized superconducting magnetic storage($\mu$SMES) coils become commercially as an energy storage device for a power conditioner. In design and fabrication of the $\mu$SMES coils, to determine optimum current capacity of the superconducting(SC) conductors is one of the important things. We thus investigated the effect of conductor's current capacity, current density, and stability on the coil's maximum stored energy density in consideration of AC losses and switching device's capacities in a power converter. The results show that the smaller current capacity of the SC conductors is preferred for the $\mu$SMES coils but can increase their induced voltage excessively.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09b
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• pp.933-934
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• 2006

The present study examines the sintering behaviour and effect of manganese addition both mechanically-blended and mechanically alloyed on Cr-Mo low alloyed steels to enhance the mechanical properties. Mn sublimation during sintering provides some specific phenomena which facilitate the sintering of alloying elements with high oxygen affinity. First step is the optimization of milling time to attain a master alloy with 50% of Mn which is diluted in Fe-1.5Cr-0.2Mo water atomized prealloyed powder by normal mixing. These mixtures are pressed to a green density of $7.1g/cm^3$ and sintered at $1120^{\circ}C$ in $90N_2-10H_2$ atmosphere.

• Review of KIISC
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• v.11 no.3
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• pp.65-74
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• 2001

SC27의 WG2는 정보기술보안 그 자체에 대한 표준을 만드는 Working Group이다. SC27 소개는 한국통신정보보호학회지 제3권 제2호 (1993년 6월)를 참고하기 바라며, 본 고에서 소개하는 오슬로 회의(2001. 4) 이전에 개최된 21차 동경 회의(2000. 10)는 동 학회지 제11권 1호(2001년 2월)을 참고하면 본 고를 이해함에 있어 많은 도움이 될 것으로 사료된 다. 본 고에서는 지난 2001 4. 23(월)∼27(금) 노르웨이 오슬로에서 개최된 22차 회의에 다녀와서 보안기술 표준화에 관한 최신 정보를 이 분야의 관심이 있는 전문가들에게 전파하고자 각 과제별로 진행사항과 회의결과 및 회의 중 특기할 사항들을 정리하였다.

• Review of KIISC
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• v.21 no.2
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• pp.30-35
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• 2011

ISO/IEC JTC 1에서 정보보안 기술에 대한 국제표준화를 추진하고 있는 서브위원회(SC, subcommittee)는 SC 27 서브위원회이다. 이 위원회는 1980년 창립되어 금년으로 21년째 되는 서브위원회로, 정보보호관리체계, 암호 및 보안 메커니즘, 보안성 평가 기준, 보안 통제 및 서비스, 아이덴티티 (identity) 관리 및 프라이버시 기술에 대한 국제표준화를 추진하고있다. 이중 작업반 4에서는 보안 통제(security control) 및 서비스에 대한 국제표준화를 추진하고 있으며, 2006년에 창립되어 주로 네트워크 보안, 정보보호 침해사고 관리, 사이버 보안, 디지털 증거자료(포렌직), 공급자 체인 보안, 스토리지 보안 등 서비스 및 응용보안에 초점을 맞추어 국제표준화를 추진하고 있다. 본 고에서는 작업반 4에서 최근에 수행되고있는 주요 국제표준화 내용을 살펴보고 주요 이슈를 제시한다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.38 no.1
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• pp.182-187
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• 2015

Process capability indices (PCIs) have been widely used in manufacturing industries to provide a quantitative measure of process potential and performance to meet the specification limits on quality characteristics. The most of existing PCIs are concerned with a single variable. But, in many cases, people want to express a integrated PCI which includes a couple of sequential processes. In this paper, we analyzed the characteristics of system PCIs such as ${\bar{Cp}}(f)$, $SC_{pk}$, $SC_{psk}$, $C^T_{psk}(m)$ and $SC_{pm}(m)$.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.26 no.1
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• pp.81-92
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• 2000

Development of stabilized enzyme was attempted for cosmetic applications. Papain, a proteolytic enzyme, was stabilized through conjugation with a soluble carbohydrate biopolymer, SC-glucan$^{TM}$ . With a novel structure of the conjugation site, stability of the enzyme was significantly enhanced such that more than 90% of the initial activity retained after a month storage at 45$^{\circ}C$, while no activity were detected in native enzyme or enzyme simply mixed with SC-glucan$^{TM}$ after the storage. Conjugation with SC-glucan$^{TM}$ not only extended the half-life of the enzyme on storage at higher temperature, but was also found to protect enzymes against some components contained in cosmetic products for skin care. Cosmetic lotion containing 1 % papain conjugate was more effective and less irritative in exfoliating stratum corneum of human skin than the lotion containing 5% lactic acid, one of the current popular exfoliating agents.gents.

• Journal of the Optical Society of Korea
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• v.14 no.1
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• pp.49-54
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• 2010

In this study, the use of a continuous-wave (CW) supercontinuum (SC) seeded by an erbium-doped fiber's amplified spontaneous emission (ASE) for optical-coherence tomography imaging is experimentally demonstrated. It was shown, by taking an in-depth image of a human tooth sample, that due to the smooth, flat spectrum and long-term stability of the proposed CW SC, it can be readily applied to the spectral-domain optical-coherence tomography system. The relative-intensity noise level and spectral bandwidth of the CW SC are also experimentally analyzed as a function of the ASE beam power.

• Review of KIISC
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• v.32 no.4
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• pp.77-84
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• 2022

2020년 8월 5일 통합 개인정보보호법 [3]이 본격적으로 시행되면서 데이터의 보호와 활용을 동시에 만족할 수 있는 가명처리 개념이 도입되었다. 여러 개인정보처리자로 수집된 가명정보를 결합하기 위한 결합 관리기관이 지정되고 있다. 개인정보보호 국제표준은 관행이나 기술을 국제표준으로 개발하여 상호 연동이 가능한 서비스를 제공할 수 있을 뿐만 아니라 제품이나 서비스의 경쟁력을 강화하는데 활용할 수 있다. 개인정보보호 국제표준화를 주도적으로 추진하고 있는 대표적인 국제표준화 그룹은 국제표준화위원회/전기위원회 합동위원회 1/서브위원회 27/작업그룹 5 (ISO/IEC JTC 1/SC 27/WG 5)를 들 수 있다. 이 그룹의 의장님 독일 쾨테대학 Kai Rannenberg 교수가 맡고 있다. 여기서는 2020년 4월 전자회의 이후에는 개인정보보호 분야 3건의 국제표준을 채택하였다. 차기 회의는 2022년 9월 룩셈부르그에서 펜데믹 이후 최초로 대면과 비대면으로 개최될 예정이다. 본 고에서는 이 그룹에서 2020년 4월 이후 추진되고 있는 개인정보보호 관련 국제표준화 동향을 제시하고자 한다. 또한 지난 4월 SC27 WG5 전자 회의에서 논의된 개인정보보호 관련 주요 표준화 이슈와 대응 방안을 제시한다.

• The Korean Journal of Nuclear Medicine
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• v.32 no.4
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• pp.382-390
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• 1998

Purpose: The purpose of this study was to evaluate the accuracy of radioactivity quantitation in Tc-99m SPECT by using combined scatter and attenuation correction. Materials and Methods: A cylindrical phantom which simulates tumors (T) and normal tissue (B) was filled with varying activity ratios of Tc-99m. We acquired emission scans of the phantom using a three-headed SPECT system (Trionix, Inc.) with two energy windows (photopeak window: $126{\sim}154keV$ and scatter window: $101{\sim}123keV$). We performed the scatter correction with dual-energy window subtraction method (k=0.4) and Chang attenuation correction. Three sets of SPECT images were reconstructed using combined scatter and attenuation correction (SC+AC), attenuation correction (AC) and without any correction (NONE). We compared T/B ratio, image contrast [(T-B)/(T+B)] and absolute radioactivity with true values. Results: SC+AC images had the highest mean values of T/B ratios. Image contrast was 0.92 in SC+AC, which was close to the true value of 1, and higher than AC (0.77) or NONE (0.80). Errors of true activity by SPECT images ranged from 1 to 11% for SC+AC, $22{\sim}47%$ for AC, and $2{\sim}16%$ for NONE in a phantom which was located 2.4cm from the phantom surface. In a phantom located 10.0cm from the surface, SC+AC underestimated by 24%, NONE 40%. However, AC overestimated by 10%. Conclusion: We conclude that accurate SPECT activity quantitation of Tc-99m distribution can be achieved by dual window scatter correction combind with attenuation correction.

• Land and Housing Review
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• v.5 no.1
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• pp.35-40
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• 2014

Site coefficient and amplification factor of current domestic Seismic Design Code (KBC-2009) have no consideration for the domestic ground condition in which the base rock is normally placed within 30m form the surface. Accordingly, in this study dynamic centrifugal test and analysis for pile foundation into sand and upper structure were achieved. and the response spectrums of free surface and basement were compared with each other. Within the period 1 sec., the measured spectral acceleration of free surface and basement was bigger than the design spectral acceleration of SC and SD site. However the measured spectral acceleration of free surface and basement for the period over 1.5 sec. was smaller than the design spectral acceleration of SC site. There was no severe difference of spectral acceleration according to the upper structure, embedded depth of foundation and free surface conditions. Consequently, normal domestic apartment housing for the period range over 1.5sec. could be design more economically applying these test result.