흙집 : 토담속의 자연

나사랑 전주국제발효식품엑스포 조직위원회 2006 발효 : 맛있는 잡지 Vol.2 No.1

Service Identification of Internet-Connected Devices Based on Common Platform Enumeration

나사랑,김태은,김환국 한국정보처리학회 2018 Journal of information processing systems Vol.14 No.3

There are a great number of Internet-connected devices and their information can be acquired through anInternet-wide scanning tool. By associating device information with publicly known security vulnerabilities,security experts are able to determine whether a particular device is vulnerable. Currently, the identificationof the device information and its related vulnerabilities is manually carried out. It is necessary to automate theprocess to identify a huge number of Internet-connected devices in order to analyze more than one hundredthousand security vulnerabilities. In this paper, we propose a method of automatically generating deviceinformation in the Common Platform Enumeration (CPE) format from banner text to discover potentiallyweak devices having the Common Vulnerabilities Exposures (CVE) vulnerability. We demonstrated that ourproposed method can distinguish as much adequate CPE information as possible in the service banner.

심장 전산화단층촬영을 이용한 박출계수 산출 시 박출계수의 보정을 통한 오진율 개선에 관한 연구

나사라(Sa-Ra Na),정미애(Mi-Ae Jeong) 한국콘텐츠학회 2021 한국콘텐츠학회논문지 Vol.21 No.2

본 연구는 cardiac CT를 이용한 박출계수 산출 시 cardiac MRI와 물리적 시간 해상도 차이를 분석하여 보정함으로써 cardiac CT의 오진율을 감소시키고자 하였다. 연구 방법은 대동맥판막 역류 질환을 진단받은 138명을 대상으로 cardiac CT와 cardiac MRI의 박출계수를 산출한 후 두 검사 간 물리적 시간 해상도 차이를 cardiac CT의 박출계수에 보정한 다음 신뢰도를 평가하여, 물리적 시간 해상도 차이 보정 전, 후 cardiac CT의 오진율이 개선됐는지 평가 하였다. 연구결과, 물리적 시간 해상도 차이 보정 전 cardiac CT 박출계수의 오진율은 38.4%(53명)로 높게 나왔고, 보정 후 오진율은 23.9%(33명)로 감소하였다. 또한 Bland-Altman plot에서 확인한 보정된 cardiac CT 박출계수는 cardiac MRI의 박출계수와의 일치도가 상당히 높은 것을 알 수 있다. 결론적으로 심장판막 질환 진단시 단순한 cardiac CT의 박출계수로만 진단하는 것은 오진율을 높일 수 있으므로 cardiac MRI로 물리적 시간 해상도의 차이를 보정하면 오진율을 14.5%(20명) 감소시킬 수 있다. 그러므로 본 연구를 박출계수 산출 시 적용한다면 유용성이 높다고 사료된다. The aim of this study was to compare the cardiac CT and cardiac MRI in calculating and correcting the left ventricle ejection fraction by analyzing the physical and temporal resolution for reducing the misdiagnosis rate. One hundred thirty-eight patients with aortic value regurgitation who underwent both cardiac CT and cardiac MRI were analyzed. Left ventricle ejection fractions calculated from each exam were corrected based on the physical and temporal resolution differences and the reliability test evaluated whether the misdiagnosis rate of cardiac CT was improved after the correction. As a result of the study, the misdiagnosis rate of cardiac CT ejection fraction before correcting the difference in physical and temporal resolution was 38.4%(53 persons). In addition, it can be seen that the corrected cardiac CT ejection fraction confirmed in the Bland-Altman plot was highly consistent with the ejection fraction of cardiac MRI. In conclusion, as the cardiac CT is less well suited for measuring ejection fraction, physical characteristics and the time resolution correction using cardiac MRI is needed and the misdiagnosis rate after correction decreased to 14.5%(20 persons). Therefore, this study appears more appropriate for better prediction of ejection fraction and clinical utility.

자기공명 견관절조영검사 시 고함유량 가돌리늄 조영제의 유용성

나사라(Na, Sa-Ra),김윤신(Kim, Yoon-shin),최관우(Choi, Kwan-Woo),이호범(Lee, Ho-Beom),손순룡(Son, Soon-Yong),민정환(Min, Jung-Whan),이주아(Lee, Joo-Ah),마상철(Ma, Sang-Chull),이종석(Lee, Jong-Seok),유병규(Yoo, Beong-Gyu) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.4

본 연구는 자기공명 견관절조영검사 시 단위 부피당 가돌리늄 함유량이 2배 많은 1mmol/mL조영제를 이용하여 T1단축효과를 높임으로서 진단적 가치가 높은 영상을 얻을 수 있는 방법을 증명하고자 하였다.2012년 1월부터 2013년 8월 까지 0.5mmol/mL함유량을 가진 기존의 조영제를 사용한 20명과 1mmol/mL함유량을 가진 새로운 조영제를 사용한 21명 등 총 41명의 환자를 연구대상으로 하였다.연구방법은 가돌리늄 함유량에 따른 대조도 차이를 알아보기 위하여,견관절의 관절공간과 인접한 근육조직인 극상근,그리고 상완골두의 신호강도를 각각 측정한 후 신호대잡음비와 대조도대잡음비를 비교하였다.연구 결과,가돌리늄 함유량이 높은 1mmol/mL조영제가 0.5mmol/mL조영제에 비해 SNR이 모두 높았으며(관 절공간 38.01%,극상근 8.40%,상완골두12.78%),CNR도 가돌리늄 함유량이 높은 1mmol/mL조영제가 높았다(관절공간과 극상근 48.96%,관절공간과 상완골두 42.00%).결론적으로 T1단축효과를 높이는 다양한 방법 중 현실적으로 구현하기 용이 한 가돌리늄 함유량이 높은 1mmol/mL조영제를 이용하면 효율적으로 T1단축효과를 높여 진단적 가치가 높은 영상을 얻을 수 있을 것으로 판단된다. This research, used an contrast agent, which weighs about 1mmol/mL, of twice as much amount of gadolinum, per unit, for the test of magnetic-resonance shoulder arthrography. the reasearch which was carried out from January, of the year 2012 to August of the year 2013. consisted, of target of 41, patients including 20 ones, of whom an original, contrast agent of amount of 0.5mmol/mL, 21, ones of whom, a new, of amount of 1mmol/mL was used on, were the test target, in order to figure out the differences, according to the amount of gadolinum, according to the test results, the SNR of the contrast agent, of amount of 1mmol/mL, which is of high amount of gadolinum, was noticeably higher than the one of amount of 0.5mmol/mL(the percentage of joint space 38.01%, the supraspinous muscle 8.40%, head of humerus 12.78%). and CNR of the contrast agent, of amount of 1mmol/mL, which is of high amount of gadolinum, was higher than the one of amount of 0.5mmol/mL(the percentage of joint space and supraspinous muscle 48.96%, the one of joint space and head of humerus 42.00%). In conclusion, one of the methods of increasing the reducing effect of T1, is to use contrast agent of amount of 1mmol/mL, in order to increase the reducing effect of T1, acquire the visual of high testing quality.

XRD와 XAS에 의한 TiO2 분말의 상분율 결정

나사균,이연승 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.5

The crystallinity and phase ratio of anatase to rutile in TiO2 were estimated by x-ray diffraction (XRD) and x-ray absorption spectroscopy (XAS). Traditionally, the structural characterization of TiO2 powders has been carried out by XRD techniques, which are comparatively easy in use and analysis. However, materials with amorphous phase, nano-sized or nano-structured crystallinities cannot be fully characterized by XRD because XRD analysis has a limit for abnormal contributions of the nano-crystal such as the surface contribution. From the comparison with the experimental and calculated Ti K-edge XAS spectra, we found the possibility of efficient estimation in the crystalinites and the phase ratio of anatase to rutile for nano-sized TiO2 mixture.

자전연소합성법으로 제조된 SiO₂ 첨가된 MoSi₂ 분말 내에서의 SiO₂의 거동 연구

나사균,전민석,송준광,한동빈,정철원,김성수,이연승,Rha, Sa-Kyun,Jeon, Min-Seok,Song, Jun-Kwang,Han, Dong-Bin,Jeong, Cheol-Weon,Kim, Sung-Soo,Lee, Youn-Seoung 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.6

In order to investigate the behavior of $SiO_2$ in the molybdenum silicide powders, crystal structure of these powders was measured by XRD, in addition, surface composition and surface phase (or chemical states) and microstructure were analysed by XPS and TEM, respectively. Mo-silicide powders containing $SiO_2$ were synthesized by SHS (Self-Propagating High-Temperature Synthesis) technique. In XRD result, according to increase of $SiO_2$ contents, the crystal structure for synthesized $MoSi_2$ powders was still typical $MoSi_2$ bct without any other phases. By XPS analysis, the surface of Mo and Si source powders was covered with $MoO_3$ and $SiO_2$, respectively, and the surface of synthesized $MoSi_2$ powder was also covered with $MoO_3$ and $SiO_2$, which were stable oxides at room temperature. However, according to increase of $SiO_2$ addition, $MoSi_2$ phase in XPS spectra decreased and $SiO_2$ phase increased relatively in synthesized $MoSi_2$ powders. From the results by XPS and XRD, we found that the existent $SiO_2$ has amorphous structure. In the microstructure, the small particulates of the synthesized products added $SiO_2$ agglomerated together to form larger clusters (from ~10 nm to ~1 ${\mu}m$). From TEM, XPS, and XRD results, we found that the out layer of agglomeration of synthesized $MoSi_2$ powder is surrounded by amorphous $SiO_2$.

RMT: A Novel Algorithm for Reducing Multicast Traffic in HSR Protocol Networks

나사이프사아드알라위,이종명 한국통신학회 2016 Journal of communications and networks Vol.18 No.1

The high-availability seamless redundancy (HSR) protocolis one of the most important redundancy IEC standards thathas garnered a great deal of attention because it offers a redundancywith zero recovery time, which is a feature that is requiredby most of the modern substation, smart grid, and industrial fieldapplications. However, theHSR protocol consumes a lot of networkbandwidth compared to the Ethernet standard. This is due to theduplication process for every sent frame in the HSR networks. Inthis paper, a novel algorithm known as the reducing multicast traf-fic (RMT) is presented to reduce the unnecessary redundantmulticasttraffic in HSR networks by limiting the spreading of the multicasttraffic to only the rings that have members associated with thattraffic instead of spreading the traffic into all the network parts, asoccurs in the standard HSR protocol. The mathematical and thesimulation analyses show that the RMT algorithm offers a trafficreduction percentage with a range of about 60-87% compared tothe standard HSR protocol. Consequently, the RMT algorithm willincrease the network performance by freeing more bandwidth soas to reduce HSR network congestion and also to minimize any interventionfrom the network administrator that would be requiredwhen using traditional traffic filtering techniques.

"강박장애"에 관한 도서들 : 나를 존중하는 삶

나사나엘브랜드,강승규여 한국상담선교연구원 2010 상담과 선교 Vol.68 No.-

초고집적소자의 층간절연막용 polysilazane계 spin on glass (SOG)에 관한 연구

나사균,정석철,이재관,김진우,홍정의,이원준 대전산업대학교 반도체기술연구소 2000 半導體技術硏究所報 Vol.2 No.-

초고집적소자의 층간절연막으로서의 polysilazane계 spin on glass (SOG)의 적용 가능성을 평가하였다. 상용화된 무기 SOG 계열의 polysilazane과 polysilazane에 산화제를 첨가하여 SiO_2로의 변환 능력을 향상시킨 물질을 spin coating하고 curing하여 SOG 막을 제조한 다음, 400℃에서 900℃까지의 온도범위에서 열에 SOG막을 형성하여 gapfill 특성을 비교하였으며, SOG막에 contact hole을 형성한 다음 습식 세정에 대한 저항성을 평가하였다. 산화제를 첨가함으로써 polysilazane polymer 구조에서 SiO_2로의 변환이 더욱 효과적으로 이루어져, 기존 SOG 막에 비해 밀도 및 습식세정 chemical에 대한 저항성이 우수하고거 gapfill 특성은 동등한 수준인 SOG 막을 제조할 수 있었다. 특히, 기존의 SOG 막의 경우 좁은 gap space 내에서 curing이 충분하게 이어나지 않아 습식 세정시 hole profile이 나빠지는 문제를 산화제 첨가를 통해 해결할 수 있었다. We have investigated the feasibility of spin on glass (SOG) film from polysilazane-type resin as a premetal dielectric (PMD) layer of the next-generation ultra-large scale integrated (ULSI) devices. A commercial polysilazane resin and a polysilazane-type resin with oxidzing agent were spin-coated and cured to form SOG films. In order to study the effect of oxidizing agent and annealing, the SOG films were characterized as cured and after annealing at 400℃ to 900℃. The density and the resistance against wet chemical of the SOG films were improved by the addition of oxidizing agent, because oxidizing agent enhanced the conversion from polysilazane polymer to siO_2. The hole profile issue associated with insufficient curing of polysilazane innarrow gaps was alao resolved by oxidizing agent, while the gapfill capability of SOG was not deteriorated by oxidizing agent.

확산강조영상 검사 시 rectangular FOV 적용에 따른 ADC 값의 변화

나사라(Sa Ra Na),최관우(Kwan Woo Choi),구노현(No Hyun Koo),유병규(Beong Gyu Yoo),손순룡(Soon Yong Son) 한국방사선학회 2016 한국방사선학회 논문지 Vol.10 No.7

본 연구는 MRI를 이용한 기능검사 시 rectangular FOV를 적용하더라도 기능을 정량화한 대표 값은 차이가 없다는 것을 증명함으로써, FOV 불일치로 인해 발생되는 문제점을 개선하고자 하였다. 연구방법은 대표적인 기능 검사로 뇌졸증의 진단에 널리 사용되고 있는 확산강조영상 검사를 이용하여, 주파수부호화 방향의 FOV 변화에 따른 ADC 값의 변화 여부를 비교평가 하였다. 연구결과, 주파수부호화 방향의 FOV가 변화함에 따라 ADC값은 통계적으로 유의한 차이를 보이지 않았으며, 사후분석 결과도 유의수준 0.05에 대한 부집단이 모두 1개 밖에 존재하지 않아 FOV 변화에 따른 ADC 값의 차이가 없음을 알 수 있었다. 결론적으로 MRI를 이용한 기능 영상에서 rectangular FOV를 적용하더라도 기능을 정량화한 대표 값에는 차이가 없으므로, FOV 불일치로 인해 수반되는 공간왜곡이나 mismatching의 문제점을 개선할 수 있다. The purpose of this study is to improve the mapping between functional image and conventional image by using rectangular FOV technique. Diffusion weighted imaging which is widely used for stroke was acquired by reducing the FOV and compared each Apparent Diffusion Coefficient(ADC). As a result, there is no significant difference of each ADC value in one-way-anova analysis and post-hoc analysis. Thus, Mismatching problem may be improved by matching the FOV with rectangular FOV technique because there is no difference in ADC values.