Analysis of the Effects of Al on the Ductile-to-Brittle Transition Behavior of Ferritic Heat-Resistant Stainless Steels

Yingbo Zhang,Dening Zou,Xiaoqiao Wang,Fengshe Xia,Yong Wang,Wei Zhang 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7

The effect of Al content on the microstructure and ductile-brittle transition temperature (DBTT) of 18Cr–Al–Si ferritic heatresistantstainless steel have been studied by Charpy impact testing over temperatures ranging from 20 to 90 ℃. Charpy impacttest results show that DBTT increased with increasing Al content. Meanwhile, fracture morphology changed with increasingAl content, where the amount of dimples decreased and cleavage facets increased, indicating increases in the tendency forbrittle fracture. Furthermore, ferrite grain size, volume fraction and size of (Cr, Fe)23C6 carbides increased with increasingAl content, which led to decreasing toughness and increasing DBTT.

한국인에서 Quadruplex PCR을 이용한 8종류 상염색체 STR 유전좌의 다형성 분석

장영길,김기범,신창호,이숭덕,이윤성,이정빈 大韓法醫學會 2001 대한법의학회지 Vol.25 No.1

Two quadruplex PCR reactions were designed for 7 tetrameric (D3S2406, D4S2368, D5S818, D7S821, D9S925, D13S317, D19S253) and one trimeric (D6S1043) short tandem repeats loci to study the allele frequency and the applicability of genetic variation in these loci in forensic case works. For 310 unrelated Koreans DNA was isolated from peripheral blood using phenol/chloroform method. Quadruplex I was consisted of D4S2368, D6S1043, D7S821, D9S925 and quadruplex II D3S2406, D5S818, D13S317, D19S253. The amplified products were analyzed by 5% polyacrylamide gel electrophoresis followed by silver staining. The heterozygosity in each loci ranged 92.91-66.13%, and PD(Power of Discrimination) was above 085 in each loci. Every loci except D6S1043 followed hardy-Weinberg expectation. The cumulative PI was low as 1.65×10-10. Two mutations were noted, one in D19S253 and the other in D9S925 among 234 gametes. With these results above eight STR loci studied here preyed to be highly polymorphic enough to be used in forensic field. This study provides valuable population data in these loci for Korean.

알데히드탈수소효소 2(ALDH2) 및 CYP2E1 유전자 다형성에 따른 요중 뮤콘산 농도와 요중 8-hydroxydeoxyguanosine과의 관련성

김용대,강종원,엄상용,장연위,김성훈,김은영,이철호,문재동,김헌 대한산업의학회 2007 대한직업환경의학회지 Vol.19 No.2

음향방출 신호분류에 의한 SM45C 시효처리재의 인장변형 해석

이장규,우창기,김용배 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

This study investigates tensile deformation of the stress aging heat-treated SM45C steel which are aging temperature at 250, 300℃, aging time at 1,3 hours, and applied load at 300, 400N conditions by using acoustic emission (AE). A signal processing technology used to evaluate an AE source characterization by 2 AE measurement systems, i.e., DiSP & PCI-2 AE hardware and AEwin™ software. In this study, most suitable aging condition appeared at 250℃, 3 hours and 300N. On the other hand, in case of 250℃, 3 hours, 400N and 300℃, 3 hours, 400N conditions, yield load decreased than other conditions according to the over-aging phenomena. Especially, In case of 300℃, 3 hours and 400N condition appeared AE energy in elastic limit fairly high than non-heat treatment specimen.

정신분열병 환각의 횡문화적 연구 : 상해와 서울의 비교 A Transcultural Study

金光日,長良棟,陸明康,朴康奎,朴容千,金大虎 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.5

연구목적 : 정신분열병의 환각이 문화사회의 특성에 따라 어떤 차이가 나는지를 확인하고 그 의미를 문화정신의 학적 견지에서 고찰해보고자 이 연구를 시행하였다. 방 법 : Shanghai와 서울의 정신분열병 환자를 대상으로 환각의 형태, 내용, 주제 등에 관한 비교문화적인 조사연구를 하였다. Shanghai Mental Health Center, 국립서울정신병원, 한양대학교병원에 입원하고 있는 환자중 DSM-Ⅳ 진단기준으로 정신분열병의 진단이 확정된 환자 가운데 입원한지 1개월에서 6개월 이내인 환자를 대상으로 사전에 성별, 연령, 교육연한, 발병기간 임상아형, 등 5개 변인을 통제하여 조사대상을 선정하였다. 조사대상이 된 환자는 396명(Shanghai 182명, 서울 214명)이었다. 이중 환각이 확인된 환자 231명(Shanghai101명, 서울 130명)을 최종 연구대상으로 하였다. 결 과 : 환각의 형태에서는 양 집단 차이가 없었으나 환각의 내용이 양 집단에서 차이를 보였다. 즉 Shanghai에서는 정치적인 내용이, 서울에서는 초자연적/종교적 내용이 많았다. 결 론 : 환각의 주제나 내용은 망상과 긴밀하게 연관이 되어 있다는 점, 그리고 사회문화적 상황의 영향을 다분히 받고 있음을 알 수 있었다. Objective : The types, contents and major themes of schizophrenic hallucinations in Shanghai and Seoul were compared for evaluating cultural differences and connotation. Methods : Among the schizophrenic inpatients of Shanghai Mental Health Center in Shanghai and National Seoul Mental Hospital and Hanyang University Hospital in Seoul, 396 cases(182 cases in Shanghai, 214 cases in Seoul) were selected by two ways: a) five staged stratified random sampling of sex, age, education, clinical subtype and onset year, b) cases who have admitted for one to six months in their last admission. Among them, 231 cases(55.39% in Shanghai, 60.83% in Seoul) confirmed to have hallucinations were the final subjects of study. Results : Frequencies in types of hallucination were not different between the two groups. However, contents and major themes were different: Political themes and related contents were dominant in Shanghai cases, and supernatural and religious themes and related contents were dominant in Seoul cases. Conclusion : It was concluded that contents and themes of hallucinations were closely related to the delusional contents and themes, and such patterns were considerably influenced by so-ciocultural characteristics.

한국인에서 DXS7132 유전좌와 GATA31D10 유전좌의 다형성에 관한 연구

안종성,장영길,이숭덕,신창호,이윤성,이정빈 大韓法醫學會 2000 대한법의학회지 Vol.24 No.1

The validation study for two STR loci on X-chromosome, DXS7132 and GATA31D10, was done including allelic distribution and frequency of each allele to use these results for individual identification and paternity testing. For 496 unrelated Koreans, above two STR loci were amplified simultaneously using duplex PCR amplification method. The amplified products were analyzed by polyarylamide gel electrophoresis followed by silver staining. In male DXS7132 locus revealed 7 different alleles ranging from 276bp to 300bp. The largest allele was consisted of 14 repetition of [TCTA] unit and took 0.3417. The allele 15 followed next as 0.3165 and allele 13 as 0.1726. In female general distribution was same except one allele, allele 18 was found additionally. The heterozygosity was 0.7706 and 23 different genotypes were found. Polymorphism information content(PIC) was 0.727. Two cases of mutation were noted in DXS7132 locus In both male and femal 7 different alleles were noted in GATA31D10 locus and the alleles ranged from 195bp to 231bp. The allele 15(199bp) took the majority of all as 0.825. The other alleles showed rather relatively low frequency. The heterozygosity was 0.2385 and 11 different genotypes were found. PIC was 0.2521, and no mutation was noted in GATA31D10 locus. Considering these two loci together, 22 different halpotype were noted.

요천추부 신경근의 체온절

김영수,조용은,장호열 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.1

Thermography shows the skin temperature changes in various conditions of the body. The skin temperature varies according to subcutaneous blood flow under the control of autonomic nervous system Lumbar radiculopathy due to disc herniation makes difference in the temperature of lower extremities caused by the changes in general function and autonomic functions of the nerve root. Digital infrared thermographic imaging(DITI) system has been used to diagnose radiculopathy without any hazards or discomforts and shows the pain due to LDH by objective change of temperature. This study has used DITIs of 55 control cases and 217 cases of LDH patients and analysed it statistically. In the room of temperature stable at 20℃, the temperature distribution of the lower extremities of the control cases ranged from 24.9℃ to 29.9℃. The significant minimal temperature difference between right and left lower extremities range from 0.1℃ to 0.4℃. The more distal, the greater the temperature difference was. The thermatome of L4. L5 and S1 was drawn in radiating type and spot type. The thermatome showed larger area than the sensory dermatome and sympathetic dermatome. There was significant increase or decrease of temperature in thermatome in LDH patients. In conclusion, preoperative DITI of the LDH patient can be helpful for diagnosing the level do LDH and the areas of pain.

Transcriptome analysis of the pheromone glands in Noorda blitealis reveals a novel AOX group of the superfamily Pyraloidea

Zhang Zu-Bing,Yin Ning-Na,Long Ji-Ming,Zhang Yong-Ke,Liu Nai-Yong,Zhu Jiaying 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.1

Noorda blitealis (Lepidoptera: Pyraloidea: Crambidae) is a major defoliating pest of Moringa trees. Focusing on its mating and reproduction, here we sequenced and analyzed the transcriptome of its pheromone glands (PGs) with a combination of Illumina sequencing, bioinformatics and phylogenetics approaches, coupled with a genomebased analysis. Transcriptome sequencing led to the yields of approximately 162 million clean reads, which were assembled into 60,578 unigenes and 121,692 transcripts, respectively. From the transcriptome, totally 117 genes encoding eight pheromone biosynthesis enzymes and one pheromone degradation enzyme were identified, 90 of which had complete open reading frames. A comparative analysis between PGs and bodies (removing PGs) revealed a large number of differentially expressed genes, including 79 pheromone biosynthesis and degradation related genes. Of the identified genes, NbliDES12 belonging to the △11 desaturase group was likely to a strong candidate for the desaturation of sex pheromones in N. blitealis, as implied by phylogenetic analyses and expression profiles. Finally and most notably, through genome and transcriptome analyses we discovered, for the first time, a novel aldehyde oxidase 6 (AOX6) group of the superfamily Pyraloidea that have been slightly expanded by gene duplications. Moreover, each orthologous AOX group shared highly conserved gene structure. Together, this current study has characterized the genes associated with sex pheromone biosynthesis and degradation from the PG transcriptome of N. blitealis, and more importantly, identifies a novel AOX group of the Pyraloidea.

Optimization of Grey Neural Network Model Based on Mind Evolutionary Algorithm

Zhang, Yong-Li(장영예),Na, Sang-Gyun(나상균),Wang, Bao-Shuai(왕바오슈아이) 한국산업경제학회 2017 산업경제연구 Vol.30 No.4

회색신경망모형은 제품의 주문 수량을 예측할 때 소 표본과 정보부족 등의 문제를 해결하는데 유용하게 사용할 수 있지만, 예측 시 무작위로 파라미터를 초기화하면 예측정확도가 낮아지는 단점이 있다. 따라서 본 연구에서는 전통적인 회색신경망모형의 단점을 보완하기 위해서 MEA(Mind Evolution Algorithm)를 적용한 최적화된 회색 신경망모형을 제시하였다. 본 연구 결과는 다음과 같다. 제품의 주문수량을 예측하기 위해서 MEA(Mind Evolution Algorithm)를 이용한 최적화된 회색신경망모형, PSO(Particle Swarm Optimization)를 이용한 최적화된 회색신경망모형, GA(Genetic Algorithm)을 이용한 최적화된 회색신경망모형, BP(Back Propagation)을 이용한 회색신경망모형에 대해 비교분석을 하였다. 분석결과를 보면, MEA(Mind Evolution Algorithm)를 이용한 최적화된 회색신경망모형의 예측 총오차 4457.6000, 평균루트오차 920.7372, 평균오차백분율 4.04%, 운영시간은 1.1509초로 분석되었다. 선행연구에서 제시한 가장 우수한 PSO(Particle Swarm Optimization)를 이용한 최적화된 회색 신경망모형 보다, MEA(Mind Evolution Algorithm)를 이용한 최적화된 회색신경망모형의 예측 총 오차가 16.12%, 평균루트오차 12.39%, 평균오차백분율 16.87%가 감소되어, 결과적으로 운영시간이 감소되면서 계산속도가 21.61%가 증가 되었다. 따라서 다른 지능알고리즘과 비교하면, MEA(Mind Evolution Algorithm)를 이용한 최적화된 회색신경망모형은 최고의 예측 정확도와 계산속도가 높다는 장점을 보유하고 있다. 따라서 기업에서 제품의 주문 수량을 예측할 때 소 표본과 정보부족 등의 문제가 발생할 경우, 최적화된 회색신경망모형을 이용하는 것이 필요하다. For the problem of randomized parameters and large error, the grey neural network model optimized by mind evolutionary algorithm(MEA-GNNM) was presented. The experiment results showed that the total error, root mean square error, mean percentage error, and running time of MEA-GNNM were 4457.6000, 920.7372, 4.04% and 1.1509 seconds; Compared with GA-GNNM, the total error, root mean square error and mean percentage error of MEA-GNNM had decreased by 16.12%, 12.39% and 16.87%, and the calculation speed increased by 21.61%. Compared with PSO-GNNM, the total error, root mean square error and mean percentage error of MEA-GNNM had decreased by 9.13%, 11.33% and 12.17%, but running time increased by 104.50%. The paper presents a new approach to optimize the parameters of grey neural network model, and also provides a new method having higher prediction accuracy for the time series prediction.

Limited Unilateral Decompression and Pedicle Screw Fixation with Fusion for Lumbar Spinal Stenosis with Unilateral Radiculopathy : A Retrospective Analysis of 25 Cases

Zhang, Li,Miao, Hai-xiong,Wang, Yong,Chen, An-fu,Zhang, Tao,Liu, Xiao-guang The Korean Neurosurgical Society 2015 Journal of Korean neurosurgical society Vol.46 No.4

Objective : Lumbar spinal stenosis is conventionally treated with surgical decompression. However, bilateral decompression and laminectomy is more invasive and may not be necessary for lumbar stenosis patients with unilateral radiculopathy. We aimed to report the outcomes of unilateral laminectomy and bilateral pedicle screw fixation with fusion for patients with lumbar spinal stenosis and unilateral radiculopathy. Methods : Patients with lumbar spinal stenosis with unilateral lower extremity radiculopathy who received limited unilateral decompression and bilateral pedicle screw fixation were included and evaluated using visual analog scale (VAS) pain and the Oswestry Disability Index (ODI) scores preoperatively and at follow-up visits. Ligamentum flavum thickness of the involved segments was measured on axial magnetic resonance images. Results : Twenty-five patients were included. The mean preoperative VAS score was $6.6{\pm}1.6$ and $4.6{\pm}3.1$ for leg and back pain, respectively. Ligamentum flavum thickness was comparable between the symptomatic and asymptomatic side (p=0.554). The mean follow-up duration was 29.2 months. The pain in the symptomatic side lower extremity (VAS score, $1.32{\pm}1.2$) and the back (VAS score, $1.75{\pm}1.73$) significantly improved (p=0.000 vs. baseline for both). The ODI improved significantly postoperatively ($6.60{\pm}6.5$; p=0.000 vs. baseline). Significant improvement in VAS pain and ODI scores were observed in patients receiving single or multi-segment decompression fusion with fixation (p<0.01). Conclusion : Limited laminectomy and unilateral spinal decompression followed by bilateral pedicle screw fixation with fusion achieves satisfactory outcomes in patients with spinal stenosis and unilateral radiculopathy. This procedure is less damaging to structures that are important for maintaining posterior stability of the spine.