Influence of heat‑treated Al-Si coating on the weldability and microstructural inhomogeneity for hot stamped steel resistance nut projection welds

Eun‑Joon Chun,Sung‑Sang Lim,Young‑Tae Kim,Ki‑Sung Nam,김영민,Young‑Whan Park,Siva Prasad Murugan,Yeong‑Do Park 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1

Resistance nut projection weldability of Al–Si coated hot stamped steel (HSS) was investigated under the viewpoint of weldablecurrent range and joint strength (pull-out load). The microstructural inhomogeneities in the welds were also studied inorder to elucidate the factors affecting the joint strength of the welds. The weldability of the given Al–Si coated HSS wascompared with the weldability of an identical HSS without the Al–Si coating (Al–Si coating was polished out) and Zn coateddual phase steel. The weldable current range of Al–Si coated HSS was found to be narrower than that of the other materials. Furthermore, the average pull-out load within the weldable current range of the Al–Si coated HSS was the lowest among thethree materials. The reason for poor weld mechanical property of the Al–Si coated hot-stamped steel was attributed to themicrostructural inhomogeneities such as unmixed Al–Si coating layer at the edge of the nugget and the second phase Fe3(Al,Si) intermetallic compound. The formation of Fe3(Al, Si) phase was attributed to the solidification segregation of Al and Siduring the weld solidification and was confirmed with the numerical analysis of solidification segregation.

노인 낮병원의 심리사회적 치료 프로그램이 노인의 신경인지기능과 우울 증상에 미치는 효과

유계준,송정은,오병훈,안석균,이홍식,오희철,구은형,황혜숙,이은철 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.5

노인에게 있어서 신경인지기능의 저하와 우울 증상은 가장 흔한 장애이며 신체적, 정신적인 면에 많은 영향을 미치고 있다. 또한 이러한 장애중 비임상군에서 심리사회적 치료개입의 효과가 보고되고 있다. 이러한 측면에서 지역사회에서 노인에게 제공되는 심리사회적 치료개입의 중요성이 높아지고 있다. 이전의 연구에서는 대상이 특정 집단이거나, 비교군이 없거나, 치료효과에 대한 추적 관찰이 이루어지지 않는 등의 제한점이 있었으며, 현재 국내의 노인 낮병원은 소수에 불과하고 이러한 낮병원의 치료효과에 대한 연구는 거의 없는 실정이다. 따라서 본 연구는 지역사회 정신보건센터에서 운영하는 노인 낮병원에 참가하는 노인들을 대상으로 낮병원의 심리사회적 프로그램이 노인들의 신경인지기능과 우울 증상에 미치는 효과와 이에 대한 유지 효과의 유무를 알아보고자 하였다. 경기도 광주군 정신보건센터의 노인 낮병원에 참여한 노인을 치료군으로, 치료를 거부하거나 치료 중 탈락한 노인을 비교군으로 하여 10주간의 낮병원 치료전후와 치료종결 후 10주에 신경인지기능은 한국형 간이 정신상태검사(이하 MMSE-K)로, 우울 증상은 단축형노인우울척도(이하 SGDS)로 평가하여 두 군을 비교하였고 치료군의 치료 직후와 치료종결 후 10주를 비교하였다. 연구결과 노인 낮병원의 심리사회적 치료가 시간에 따른 SGDS점수 변화에 통계학적으로 유의한 영향을 미쳤으며, MMSE-K점수 변화에는 통계학적으로 유의한 영향을 미치지 않았다. 또한 10주 추시가 가능했던 치료군 중 약 43%가 10주 후 SGDS가 증가하여 호전되었던 우울증상의 악화를 보였다. 본 연구 결과 노인 낮병원의 심리사회적 치료 프로그램 개입은 노인에게 있어서 우울 증상을 호전시키며 신경인지 기능에는 직접적인 영향을 미치지 않는 것을 알 수 있었다. 또한 상당수에서 심리사회적 치료 개입으로 인한 우울 증상의 호전이 유지되지 않음을 알 수 있었다. 이는 노인우울증상의 치료에 낮병원의 심리사회적 치료 프로그램이 효과적일 수 있음과 치료 후 이를 유지하기 위한 부가적인 치료개입의 필요성을 시사한다. Cognitive impairment and depression are the most common symptoms affecting the elderly on physical and mental states. Studies have shown that these symptoms in mild cases are improved by psychosocial intervention, emphasizing the importance of therapeutic intervention provided in the community. The purpose of this study was to investigate whether the psychosocial program at a geriatric day care service has any therapeutic effect on the cognitive function and depressive symptoms in the elderly and whether such effect can be maintained. The experimental group was composed of 37 elderly patients attending the day care service at the mental health center located in Kwangju county, Kyonggi province. The control group was composed of 22 elderly patients who either refused intervention or who dropped out of the program. Cognitive function was assessed with the Korean version of the Mini-Mental State Exam(MMSE-K), and depressive symptoms were assessed with the Short-form Geriatric Depression Scale(SGDS). The experimental group and the control group were compared on the score of on each test, which was administered before and after the program and 10 weeks after discontinuation of program. In the experimental group, the scores acquired immediately after the program and at 10 weeks of follow-up were also compared. The results showed that psychosocial intervention at a geriatric day care service was significantly associated with the change in SGDS scores dependent on time but not significantly associated with the change in MMSE-K scores. In the experimental group whose follow-up assessment was possible, it was further shown that 43% of patients had increased SGDS scores 10 weeks after the program ended, indicating that depressive symptoms had worsened. This study suggests that psychosocial therapeutic intervention in the geriatric day care service improve depressive symptoms but not cognitive functions in the elderly. In addition, for a considerable percentage of subjects in the experimental group, the improvements in depressive symptoms were not sustained after the intervention was withdrawn. These findings proposes a need of strengthening therapeutic intervention to maintain such effect.

과호산구증가증의 원인과 발생율에 대한 임상적 고찰

김봉준,이천우,조은주,김희규 고신대학교 의과대학 2010 고신대학교 의과대학 학술지 Vol.25 No.2

Background: Eosinophilia is associated with various primary and reactive conditions. The incidence and causes of eosinophilia might have changed through time according to the changes in the incidence of diseases such as cancer, chronic degenerative diseases, and so forth. This study was sought to investigate the causes and the incidence of hypereosinophilia and compare the results with those obtained by other reports in Korea. Methods: Eosinophilia and hypereosinophilia are diagnosed when the absolute eosinophil count is greater than 500/μL and 1,500/μL, respectively. Patient's clinical records were reviewed to determine the underlying clinical conditions in relation to what causes hypereosinophilia. Results: Out of 18,941 patients who undertook hematology profiles, 1,584 (8.4%) and 143 (0.75%) were found to have eosinophilia and hypereosinophilia, respectively. Among patients with hypereosinophilia, 106 patients (74.1%) had identifiable and/or possible causes. The major causes of hypereosinophilia were malignancy (48.1%), allergy and skin diseases (22.6%), infectious diseases (9.4%), gastrointestinal tract diseases (5.7%), and hepatobiliary diseases (4.7%). Conclusion: We found various causes of hypereosinophilia in this study, and the most common cause of hypereosinophilia was malignancy. Therefore, a thorough study in patients with hypereosinophilia is necessary.

난치성 측두엽 간질환자의 발작간 뇌파소견

김지언,손은익,김준식,이상도,박영춘 대한신경과학회 1998 대한신경과학회지 Vol.16 No.4

A-431 세포주의 방사선 및 항암제의 감수성에 관한 실험적 연구

고광준,최은숙,홍성우 大韓口腔顎顔面 放射線學會 1999 Imaging Science in Dentistry Vol.29 No.1

Objectives: The purpose of this study was to aid in the prediction of tumor cell tolerance to radiotherapy and/or chemotherapy. Material and Methods: Human epidermoid carcinoma A-431 cell lines were irradiated by 2, 4, 6, 8, 10Gy at a dose rate of 210cGy/min using Co Irradiator ALDORADO 8 and then were exposed to bleomycin or cisplatin at concentration of 2㎍/ml for 1 hour. The viable cells were determined for each radiation dose and/or each drug at the 4th day and cell surviving curves were obtained using semiautomated MTT assay. Results: The surviving fraction after irradiation of 2Gy was 0.99, and there was not significant difference of surviving fraction in comparison with the control group on A-431 cell line(P>0.05). But there were significant differences of surviving fractions at doses of 4, 6, 8, 10Gy in comparison with the control group(P<0.05). The cytotoxicity of bleomycin or cisplatin was significantly different in comparison with the control group on A-431 cell line (P<0.05). And the cytotoxicity of cisplatin was greater than that of bleomycin on A 431 cell line (P<0.05). There were significant differences of surviving fractions after irradiation of 2, 4, 6, 8, 10Gy with bleomycin or cisplatin in comparison with each group of irradiation only on A-431 cell line(P0.05). There were significant differences of surviving fractions between the groups of irradiation with bleomycin and cisplatin at doses of 2, 4Gy(P<0.05), but there were not significant differences of surviving fractions at doses of 6, 8, 10Gy on A-431 cell line(P>0.05).(J Korean Oral Maxillofac Radiol 1999:29:325-337)

니코틴 패취제의 생물학적 동등성 평가

배준호,박은석,지상철 성균관대학교 약학연구소 1997 成均藥硏論文集 Vol.9 No.1

The bioequivalence of two nicotine patches was evaluated in 16 normal male volunteers (age 21∼27 yrs) following single transdermal application. Test product was "Nicostop patch" made by Sam Yang Co. and reference product was "Nicotinell TTS patch" made by Korean Searle Ciba-Geigy Co. After nicotine patches were applied onto the inside of the forearm, blood was taken at predetermined time intervals and the nicotine concentration in plasma was determined with a sensitive GC method using NPD detector. AUC and C_max the differences in AUC and C_max between two products were 5.47% and 2.70%, respectively. The powers (1-β) for AUC and C_max were >90% and 88.76%, respectively. Detectable differences(△) and confidence intervals were all less than 20%. All of these parameters met the criteria of KFDA for bioequivalence, indicating that "Nicostop patch" is bioequivalent to "Nicotinell TTS patch".

On-Line 전용 쇼핑몰의 성공 요인에 관한 탐색적 연구

김은수,서용준 경운대학교 산업기술연구소 2000 産業技術硏究論文誌 Vol.3 No.1(A)

The object of this exploratory study is to review the success factors(SFs) on On=line Shopping Mall and suggest the comprehensive point of individual views between the factors. Recently, the need for growth of electronic commerce is added up to the global concerns on internet shopping mall. The findings and contributions of this study is summarized as the suggestion of overall viewpoint on the separated SFs from the prior analysis, and preparation for the following research with the integrated factors definition.

韓國과 西洋體育의 歷史的 考察

崔昌俊,宋銀燮 群山大學校 1984 論文集 Vol.9 No.-

Both in oriental and occidental worlds physical education is so much related with developments of each country from the ancient till the present time. So the study of physical education is going with the study concerns with cultural and civilizational backgrounds. Occidental physical education in chronological order have something to study with oriental physical education, particularly in Korea. The origination of olympic games in Greece is so much related with politics, economics, and military power. We, in Korea, have similar motivations in the origination of physical activities. For example, the celebrations like in Greece, in May and October concerned with planting and harvesting. Dongmaeng, Yunggo, Moochon had some similar celebrations. And these celebrations included some physical activities. So we can find the present physical activities are rooted in such ones in ancient times. And we can find chronical power domonstrations and development in other sides are so much related with rise and fall of the concern in physical activities. I found that similarities between the celebrations of olympia in Greece and those of KokuRyu, Pu Yyu, Yae Ie and Mu cheon in Korean history. These celebrations in Korea is so much closed with military activities. We can see similarities of old Korean countries like Greak celebrations. And such similarties of some have been developed like those of present physical activities. Observing old plays historically ChukKuk played in 3 countries are similar to present soccer, Sael main Koryu Dynasty present ski, Keok gu Harkey resectively. But The traditional sports uttered above are not present in the present Korea, but exists only in the historical backgrounds. If we search and develop the traditional sports games. we can embody ourselves distinctively through our diverise sports games inherited from the ancient times, and contribute those backgrounds to the cultural stream so that we may bloom our own culture to be balanced with cultural factors outside. After coloney of Japan Korean physical activities are So much influened by those of America. But I think developing distinctive national physical activities is important burden to the enhancning of Korean physical education.

다발성 골수종

최은숙,고광준 大韓口腔顎顔面 放射線學會 1993 Imaging Science in Dentistry Vol.23 No.2

This is a report of multiple myeloma occurred in the left mandibular body and skull. 66-year-old patient was referred to our hospital with a complaint of painful swelling on the left mandibular body area. The author diagnosed it as a multiple myeloma by the clinical examination, radiographic findings, laboratory findings and the histopathological findings. The purpose of this report is to aid in the diagnosis of multiple myeloma and to aid to differentiate it from malignant tumours. The characteristic features are as follows: 1. In clinical examination, painful swelling was observed in left mandibular body area. 2. In radiographic findings, radiograms showed relatively ill-defined radiolucency without sclerotic border in left mandibular body area. And also represented multiple punched-out radiolucency in the skull and pathologic fracture of vertebral body on lumbar 3 level. 3. In histopathologic findings, infiltration of abnormal plasma cells was observed. 4. In laboratory findings, decreasing of albumin/globulin ratio, hypercalcemia, renal impairment was observed, but we could not find the Bence-Jones protein in urin.

강관 기둥의 베이스플레이트 설계법 제시

김은화,김원기,이승준,이명재 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

Base plates for tubular columns have been proposed in AISC Design Guide Series (1991), which have been developed for wide flange columns. Therefore, 1) Base plate must be designed by considering external cantilever model and internal simple supported slab model, when base plate is loaded by normal load. 2) Base plate is designed by more economical method between internal cantilever model and design method of 1), when base plate is loaded by light load. But, this study is proposed design method of 1) except 2), and it will demonstrate using design examples of table2,3.