Misorientation Characteristics at the Growth Front of Abnormally-Growing Goss Grains in Fe–3%Si Steel

Tae‑Young Kim,Tae‑Wook Na,Hyung‑Seok Shim,Yong‑Keun Ahn,Yong‑Kwon Jeong,Heung Nam Han,Nong‑Moon Hwang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12

Penetrating morphologies at the growth front of abnormally-growing Goss grains in Fe–3%Si steel was examined in view ofthe possibility that they are the two-dimensional section of the solid-state wetting (SSW) along the triple junction line. Toobtain the statistically meaningful data, 102 penetrated grain and 204 penetrating abnormally-growing Goss grain morphologieswere examined. The misorientation angles of penetrating and penetrated grains were measured by electron backscattereddiffraction. Among the 102 examined penetrated grain boundaries, none has low misorientation angles less than 15°,whereas 17.2% of the 204 penetrating grain boundaries have low misorientation angles, and 23.5% of them have coincidencesite lattice boundaries. Besides, boundary energies of penetrating Goss grains, which were estimated from misorientationangles of the three grains in the penetrating morphology, satisfied the energetic condition for SSW along the triple junctionline. These results imply that the abnormal grain growth of Goss grains in Fe–3%Si steel occurs by the mechanism of subboundaryenhanced SSW.

맨드라미(Celosia cristata L.) 꽃 메탄올 추출물로부터 용매분획된 분획물의 항산화활성

김현영(Hyun Young Kim),고지연(Jee Yeon Ko),송석보(Seuk Bo Song),김정인(Jung In Kim),서혜인(Hye In Seo),이재생(Jae Saeng Lee),곽도연(Do Yeon Kwak),정태욱(Tae Wook Jung),김기영(Ki Young Kim),오인석(In Seok Oh),정헌상(Heon Sang Jeong),우 한국식품영양과학회 2012 한국식품영양과학회지 Vol.41 No.11

맨드라미꽃의 식품학적 이용가능성을 확인해 보고자 항산화성분 및 항산화활성에 대해 검토하였다. 맨드라미꽃의 항산화성분과 활성은 메탄올 추출물과 순차적 용매분획물에 대해 측정하였으며, 메탄올 추출물과 hexane, chloroform, ethyl acetate, butanol 및 물 분획물의 추출수율은 각각 23.33, 10.27, 20.00, 13.63, 17.55 및 38.54%였다. 맨드라미 꽃 메탄올 추출물의 총 polyphenol, flavonoid 및 tannin 함량은 각각 6.80 ㎎ GAE/g ME, 2.34 ㎎ CE/g ME 및 6.23 ㎎ TAE/g ME였다. 순차적 용매분획물 중 butanol 분획에서 각각 14.92 ㎎ GAE/g SF, 5.44 ㎎ CE/g SF 및 13.38 ㎎ TAE/g SF로 함량이 높았다. 총 proanthocyanidin 함량은 44.72 ㎍ CE/g ME였고 순차적 용매분획물은 각각 42.47, 44.43, 50.03, 49.12 및 41.80 ㎍ CE/g ER로 용매간 유의적인 차이를 보이지 않았다. 맨드라미꽃의 메탄올 추출물의 DPPH 및 ABTS radical 소거활성은 각각 5.24 및 10.70 ㎎ TE/g ME였고 butanol 분획에서 각각 12.53 및 21.09 ㎎ TE/g SF로 활성이 높았다. 메탄올 추출물의 SOD 유사활성은 7.96 unit/mL로 나타났고 hexane, chloroform, ethyl acetate, butanol 및 물 분획물은 각각 4.56, 6.15, 8.07, 12.36 및 5.21 unit/mL로 butanol 분획의 활성이 높았다. 맨드라미꽃 추출물의 항산화성분과 항산화활성 간에 높은 정의 상관관계를 보였고 맨드라미꽃 추출물이 체내 및 식품에서 유익한 도움을 줄 수 있을 것으로 생각된다. The purpose of this study was to evaluate the antioxidant contents and activities of solvent fractions from methanolic extracts of cockscome flowers. The yield of methanolic extracts from cockscome flowers was 23.33%, whereas those of its solvent fractions (hexane, chloroform, ethyl acetate, butanol, and water) were 10.27, 20.00, 13.63, 17.55, and 38.54%, respectively. Total polyphenolic, flavonoid, tannin, and proanthocyanidin contents of methanolic extracts (ME) were 6.80 ㎎ gallic acid equivalent (GAE)/g ME, 2.34 ㎎ catechin equivalent (CE)/g ME, 6.23 ㎎ tannic acid equivalent (TAE)/g ME, and 44.72 ㎍ CE/g ME, respectively. The highest total polyphenolic, flavonoid, and tannin contents of solvent fractions were 14.92 ㎎ GAE/g solvent fraction (SF), 5.44 ㎎ CE/g SF, and 13.38 ㎎ TAE/g SF in the butanol fraction, respectively. The total proanthocyanidin contents were 42.47, 44.43, 50.03, 49.12, and 41.80 ㎍ CE/g SF, respectively. The DPPH and ABTS radical scavenging activities from cockscome flowers were 5.24 and 10.70 ㎎ Trolox equivalent (TE)/g ME, respectively. The highest DPPH and ABTS radical scavenging activities of the solvent fractions were 12.53 and 21.09 ㎎ TE/g SF in the butanol fraction, respectively. SOD-like activities of methanolic extracts from cockscome flowers were 7.96 units/mL, whereas those of its solvent fractions were 4.56, 6.15, 8.07, 12.36, and 5.21 units/mL, respectively. The results of this study show that notable antioxidant activities in cockscome flowers have significant health benefits.

실시간 분산 환경 감시를 위한 TMO 모델의 연구

정윤석,김태완,장천현 건국대학교 산업기술연구원 2005 건국기술연구논문지 Vol.30 No.-

We need an additional monitoring tool to observe a TMO model-based system because the conventional tools ae not based on the monitoring concept. Some studies have been conducted to develop a monitoring tool. But it is hard for them to support a distribued monitoring because they did not use a data sharing and delivery mechanism provided by the TMO model. To solve this problem, in this paper, we propose a TMO monitoring model which the TMO model and a monitoring concept are combined in. The model is composed of some components to support monitoring, and it guides the middleware to take all the monitoirng functions. Thus, a user can get monitored data provided by the middleware without any efforts. In addition, in this paper, we propose the MODS and MDC which are mechanisms to share or deliver the monitored data in distributed environments. These can resolve problems with conventional data stores used by the legacy monitoring tools, and provide a fundamental data management scheme to monitor several systems in distributed environments. The TMO monitoring model, MODS, and MDC can be used for a TMO system monitoring, performance evaluation, and monitoring tool development.

CITIS 지원 기술정보관리 시스템의 설계

정석찬,한태창,서범수,조장혁,주경준 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.1

CITIS(Contractor Integrated Technical Information Service) is a contractor's developed service to provide electronic access and/or delivery of contractually required information. CITIS satisfies one of the major CALS objectives to furnish a single-entry point for authorized access to contractor-generated Contract Data Requirement List(CDRL) data. A critical requirement for the practical implementation of the CITIS concept is the ability to access multiple existing heterogeneous databases in a fashion transparent to the CITIS user. In this paper, we will propose a prototype system model for CITIS, and discuss the system architecture of proposed CITIS system as a global information management system for distributed and heterogeneous local information systems. Furthermore, we will discuss about the required server module and using-scenario of proposed CITIS system.

효율적인 질감 영상 인식에 관한 연구

정광민,문태정,김기석 慶南專門大學 1999 論文集 Vol.27 No.1

플레이트를 이용한 냉간성형 각형강관 T형 접합부에 관한 실험적 연구

석희원,박금성,정상민,조성식,배규웅,문태섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

The purpose of this paper is to investigate experimentally the strength and deformation of T-joints to evaluate the structural behavior of truss connection consisted in square hollow steel section with plate. There are the branch plate type in T-joint shapes. Principal parameters are the ratio of the chord width to thickness(2ν=31.3, 22.2, 16.7) and the ratio of branch plate thickness to chord width(βp=0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.85). The most important result obtained from this experiment is as follows; The ultimate strength of T-joints increase proportionally as the 2ν ratio decrease, and the βp ratio increase. The others, experimental results are summarized for ultimate strength to displacement, initial stiffness and failure mode of each T-joints.

대용섬유자원으로써 어저귀를 이용한 한지제조(제1보) : 어저귀의 건물 생산량 및 펄프화 특성 Productivity and Pulping Characteristics of Indian Mallow

정선화,조남석,최태호 한국목재공학회 2002 목재공학 Vol.30 No.2

본 실험은 산림자원의 감소 예방과 지구의 환경보존을 위해서 생장이 빠르고 펄프원자재로 활용할 수 있는 비목재 섬유작물을 도입하는 것을 목적으로 하고 있다. 또한 부족한 한지의 원료인 닥나무를 수입하고 있는 실정에서, 국내에서 자생하고 있는 비목재섬유로 한지를 제조함으로써 수입대체 및 원가절감 등 일석이조의 효과를 거둘 수 있다. 이에 불량한 환경조건에서도 생육이 왕성한 어저귀(Abutilon avicennae G.)를 재배하여 그간의 진보된 펄프 제조기술을 적용하여 새로운 제지용 원료로 개발함으로써 부족한 원자재는 물론이거니와 국내 부존자원 이용의 극대화를 꾀하고자 실시하였다. 또한 폐기처리되는 농산물의 이용극대화를 꾀하기 위해 전목펄프화를 실시하였다. 그 결과 어저귀는 생장속도가 빠르고 수확기가 짧으며 집약적 재배 및 관리가 가능하여 단위면적당 최대의 수확량을 올릴 수 있었다. 어저귀 인피부의 섬유장은 2.4㎜로써 목재섬유 중 소나무와, 비목재섬유 중 케나프와 매우 유사한 결과를 보여주었고, 화학성분의 분석결과 어저귀 섬유는 추출성분의 함량이 높고 리그닌이 적은 것이 특징적으로 나타났다. 펄프화와 관련하여 인피부는 150℃에서 48∼57%, 전간부는 170℃에서 43∼51%의 높은 수율을 나타냈고, 설포메틸 펄프화법의 수율이 더 높게 나타났다. 펄프의 탈리그닌율도 두가지 펄프화법 모두 90% 이상의 높은 탈리그닌율을 나타내었다. Indian mallow is characterized by the rapid growth and high harvest of the fibrous materials. This study was carried out to investigate the sheet properties of Hanji using Indian mallow, made by different pulping methods, such as alkali and sulfomethylated pulpings and different stock compositions, various mixing ratios of bast fiber, woody core and whole stalk fibers. The results from this study were summarized as follows. The length and width of the bast fibers were 1.40∼4.30㎜(av. 2.35㎜) and 9.2∼26.4㎛(av. 18.3㎛), respectively. The cell wall thickness was 4.0∼11.5㎛(av. 7.7㎛). Runkel ratio, flexibility coefficient and fiber length/fiber width ratio were 1.38, 0.42 and 128 respectively. Bast fiber and whole stalk were cooked by alkali and sulfomethylated methods. Sulfomethylated pulping resulted in superior pulp in terms of yield and quality as compared with those of alkali pulping. The pulp yields of bast fiber was higher than those of whole stalk.

한국형 우울장애 약물치료 알고리듬 (Ⅳ) : 우울장애의 아형 및 부작용에 따른 항우울제의 선택과 여성우울장애에서의 치료전략

전현태,이상열,김원,민경준,박원명,서정석,석정호,송해철,전덕인,홍진표,한국형 우울장애 약물치료 알고리듬 2006 연구그룹 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.6

Objectives : In 2002, the Korean Medication Algorithm Project for Major depressive Disorder (KMAP-MD) was published, but there has been a need for a guideline about detailed issues of depressive disorder. We revised KMAP-MDD andreestablished Korean Medication Algorithm Project for Depressive Disorder (KMAP-DD) in 2006. Methods : A questionnaire had been developed by the executive committee for KMAP-DD. The review committee consisted of 101 experienced psychiatrists. From the total of 22 questions in the questionnaire, 7 questions were evaluated for these subjects . We classified the expert opinions to 3 categories according to its confidence interval; first, second and third line. Results : SSRI and venlafaxine were the first line antidepressants (AD) for atypical and melancholic depression. For dysthymic disorder and minor depressive disorder, SSRI was recommended as the first line medications. Only AD medications was a preferred initial strategy for treating premenstrual dysphoric disorder, mild to moderate and severe non-psychotic postpartum depression. In severe psychotic postpartum depression, combination therapy of AD and atypical antipsychotics was the treatment of choice. SSRI was preferred when considering sedation, anticholinergic and cardiovascular adverse effects. Also, experts recommended mirtazapine against gastrointestinal adverse effects and bupropion in avoiding sexual dysfunction. Conclusion : These results suggest that clinicians have to consider both clinical situations and drug adverse effects in the choice of antidepressant medications.

뇌자기공명영상촬영술상 병변을 관찰할 수 없는 허혈성 뇌경색

김진석,김태완,임정근 啓明大學校 醫科大學 1998 계명의대학술지 Vol.17 No.4

1. 임상적으로 뇌졸중이 의심되어 증상 발생후 24시간에서 2개월까지 Brain MRI을 실시한 722명의 환자들 중 결과가 가음성인 환자는 모두 22명 (3.1%)이었다. 2. Brain MRI상 병변은 관찰되지 않으나 임상 양상 및 신경학적 이상 소견으로 추정되는 병변의 위치를 구분해 보면 뇌간부가 13명 (59%)으로 가장 많았고, 피질하부 8명 (36%), 피질 1명 (4.5%)의 순 이었다. 3. 대뇌혈관 (large cerebral artery)폐쇄 보다는 분지 동맥 (branch artery)이나 소 관통동맥 (small perforating artery)의 폐쇄에 의한 것으로 추정되는 허혈성 뇌경색의 병변의 빈도가 높았다. 4. 병력, 뇌졸증 위험 인자, 임상 양상, 심전도 검사, 심초음파 검사 및 뇌혈관조영술등에서 혈전성 뇌경색은 12명 (55%), 색전성 뇌경색은 3명 (13%), 원인이 확실하지 않은 경우는 7명(32%)으로 혈전성 뇌경색의 빈도가 뚜렷하게 높았다. 5. T1강조 영상, T2,강조 영상 및 FLAIR sequence를 같이 실시함으로써 허혈성 뇌경색의 조기 발견은 과거의 연구 보고에 비하여 상당히 높아졌으나 계속적으로 Brain MRI상 가음성인 허혈성 뇌경색이 있음으로, 허혈성 뇌경색의 조기 진단에는 새로운 기법인 확산강조 자기공명영상, 관류강조 자기공명영상, 자기공명 분광경 등의 다른 특수한 Brain MRI이 필요할 것으로 생각되며, 항상 신경학적인 검사를 통한 임상적인 진단이 선행되어야 한다. Background : Brain magnetic resonance imaging (MRI) is more sensitive than computed tomography in the diagnosis of acute ischemic stroke, but may not visualize all acute ischemic stroke. For deeper understanding of MRI negative strokes, we reviewed case histories, abnormal neurological finding, and localized ischemic lesions presumedly which were not present in brain MRI scans. Methods : Patients with a clinically definite first ischemic stroke and absence of corresponding lesion in brain MRI scans were studied retrospectively with hospital records dating from January 1994 to November 1996 and prospectively from December 1996 to August 1997. Patient with transient ischemic stroke, postictal paralysis, central nervous system infection, demyelinating disease, hemiplegic migraine, functional or hysterical cause, multiple cerebral infarction, scans within 24 hours and equivocal findings were excluded. Brain MRI was scanned with T2WI, T1WI and FLAIR sequence. Results: We studied 722 patients with clinically diagnosed definite acute ischemic stroke during the study period and identified 22 patients (3.1%) with the absence of corresponding lesion in brain MRI scan. The ischemic strokes without brain lesions on MRI scan were clinically localized to the brain stem (n=13, 59%), subcortex (n=8, 36%) and in the cortex (n=1, 4.5%). Perforating arterial and thrombotic ischemic lesions seemed to be more common than large arterial & embolic lesions. Risk factors was not different between MRI positive and MRI negative ischemic stroke. Summary: Acute ischemic stroke with absence of brain lesion in MRI scans is more common in brain stem and subcortex than in the cortex. There is some potential limitation of standard MRI scan for diagnosis of acute ischemic stroke, therefore further scans with new imaging studies such as perfusion/diffusion weighted magnetic resonance imaging are required in selected cases.

학교급식의 식재료 공급체계 개선방안

위태석,황대용,최정숙,정현영 한국식품유통학회 2004 食品流通硏究 Vol.21 No.2

This study deals with school food service from the consumption extension of our agricultural products and the maximization of the educational effects point of view. By consuming regional agricultural products for school meals, the dietary life and agricultural education combined knowledge with behavior could be implemented. Therefore, to propel a "Movement of Jisanjiso", regional agricultural structure and marketing structure should be established and the effective support program of central government and autonomy also should be prepared.