Numerical Analysis of Radio‑Frequency Inductively Coupled Plasma Spheroidization of Titanium Metal Powder Under Single Particle and Dense Loading Conditions

Jun‑Seok Nam,Eonbyeong Park,Jun‑Ho Seo 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.4

In order to allow more practical prediction of RF (radio-frequency)–ICP (inductively coupled plasma) spheroidizationresults of titanium metal powder, numerical analyses under single particle and dense loading conditions were carried outand the results were compared. First, both of the numerical results for Ar inductively coupled plasma with the power levelof 30 kW revealed that the injected particles can experience not only spheroidization by melting, but also size reduction byevaporation. In addition, this size reduction was found to strongly depend on the initial sizes of the injected particles, due tothe relatively short heating time. For example, the 100 μm Ti particles were computed to hardly experience size reduction byevaporation regardless of feeding rates. However, relatively small Ti particles < 100 μm can be rapidly heated up to boilingpoints during the short flight of plasma, resulting in the size reduction by the surface evaporation. In particular, numericalresults under dense loading condition showed that the final sizes of these small Ti particles can be changed depending onthe feeding rate. For example, a single 60 μm Ti particle was calculated to be a 51 μm spherical Ti particle due to the excessiveheating. However, with the increase of feeding rate up to 1.0 kg/h, the final sizes of the as-treated Ti powder couldbe improved to 55 μm due to the plasma temperatures decreasing through complicated plasma–particle interactions. Bypredicting the relationships between the feeding rates and the initial diameters of Ti powders at a given plasma power level,numerical modellings under single particle and dense loading conditions can help in optimizing the RF–ICP spheroidizationprocess of titanium metal powder.

당(唐) 태종대(太宗代) 반위(反胃) 치료법의 개발과 백제(百濟) 의자왕(義慈王)의 질병

박준형 ( Park Jun-hyoung ),서영교 ( Seo Young-kyo ) 대구사학회 2021 대구사학 Vol.142 No.-

唐은 기본적으로 隋의 의료체계를 수용하면서도 醫術世家의 秘傳에 의해 분산ㆍ난립된 醫術의 독점을 국가의 의료체계라는 公的 영역으로 흡수하고자 하였다. 나아가 당은 그 의술을 민간에 유포함으로써 점차 의술세가의 독점적 입지를 좁혀 나갔다. 공익을 위한 의술 공개는 당 왕조의 존재 이유를 백성들에게 가장 효율적으로 각인시키는 방법의 하나였고, 이는 초기 왕조의 안정화에 기여하였다. 당 태종대 당나귀오줌을 이용한 반위 치료법 개발은 이러한 의료정책의 결실이었다. 蔣ㆍ許ㆍ巢氏 醫官들의 연구를 통해 이루어낸 새로운 치료 법은 즉위 초반부터 숙환이 있던 의자왕에게도 주목받았다. 644년 초 의자왕은 당에 파견된 사신을 통해 의사를 알아보았고, 그해 말 입당한 태자 夫餘康信이 당 태종에게 蔣元昌의 왕진을 요청했다. 당시 장원창은 益州道로 파견나가 있었기 때문에 당 태종은 그를 백제에 보낼 수 없었다. 결과적으로 태자를 보내 백제의 신라공격에 대한 입장을 해명하고 신라를 침공하지 않겠다고 약속했던 의자왕이 645년에 신라를 공격했다. 그해 고구려와 전쟁을 시작한 당 태종은 신라를 이용하여 고구려의 병력을 남쪽으로 분산시키고자 했던 의도가 무산되었다. 현재 학계에서는 백제의 신라 공격 이유를 명확하게 설명하지 못하고 있다. 645년 백제의 신라 공격으로 백제와 당의 관계가 악화되었다. 이는 신라가 대당외교에서 성공할 수 있는 여건을 만들어 주었다. 이런 점에서 645년 백제의 신라 공격은 의자왕의 질병과 의사 장원창의 왕진 요청 거부가 중요하게 작용했던 결과라고 할 수 있다. Tang China(618-907), which inherited the medical system of the preceding Sui China(589-618), attempted to reorganize it by absorbing various medical traditions which were then monopolized by hereditary medical families. The hereditary remedies and knowledge of medical specialists who were employed as government physicians were integrated into the state medical system, and the newly developed remedies were open to public. The development of Banwi (反胃, gastric disorder) remedy using donkey urine was one of the cases demonstrating the success of the early Tang medical system. The remedy, developed through a joint research by the physicians from three prestigious medical families in early Tang, was soon to be known to Baekje. King Uija (r. 641-660) of Bakje, who had been suffered from Banwi, dispatched envoys to Tang to ask to send Jiang Yuan-chang to Baekje in 644. The Baekje court seems to have regarded Jiang, a physician who participated in the development of new Banwi remedy, as the most qualified person to cure King Uija. Tang government, however, could not dispatch Jiang to Baekje as he was then working near Sichuan province, hundreds miles from Chang'an, the capital of Tang. As a result, King Uija missed a chance of being treated with the new remedy. Then Baekje, which had once promised not to attack Shilla by sending a prince to Tang, resumed invasion of Shilla in 645, spoiling Emperor Taizong's (r. 626-649) plan to mobilize Baekje's army in his campaign against Goguryeo. As the aftermath of this incident, the relation between Baekje and Tang was irreversibly deteriorated, while Shilla succeeded to consolidate the Shilla-Tang alliance which led to the fall of Baekje in 660. From the perspective of medical diplomacy between Baekje and Tang during the mid 7th centuries, Tang’s failure to meet Baekje’s request for the medical support might have had a grave effect on the Baekje’s decision to move against the Tang’s interests. Park, Jun-hyoung (Naval Academy / shimani5075@hanmail.net) Seo, Young-kyo (Jungwon University / syk367@naver.com)

자동차차체 및 부품제조업 산업장의 작업환경실태에 관한 조사 연구

서준호,문덕환,김정호,이채관,황용식,손병철,김대환,이창희,김휘동,이채언 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objectives: For the purpose of preparing the fundamental data and control the working environment and assessing the status of working environmental in manufacturing industry of bodies for motor car and of parts. Methods and Materials: Accessories for motor car and its engines the auther measured the noise level, concentration of dust, heavymetals, organic solvents, chemicals to 99 industries(24 working processes) form Feb. 2000 to Oec. 2000. Results: The results were as follows : 1. Mean noise level cutting, grinding, pressing, foundries and shot-blast was exceeded to threshold limit value(TLV) of noise. 2. Mean concentration of total dust was not exceeded to TLV. 3. Mean concentration of Mn in welding process and Pb in drying, welding, fabricating, rolling was exceeded to TLV. 4. Mean concentration for chemicals and organic solvents were not exceeded to TLV. 5. Mean concentration of dust and heavymetals were statistical significant difference between with local ventilation system and without local ventilation system. Conclusion: Above results, author suggest to prepare more passively control to working environment where exceeded the TLV.

1993년 신입생 실태조사 결과분석

전광희,편서영 충남대학교 1994 學生生活硏究 Vol.21 No.-

1992학년도 신입생 실태조사 결과분석

전광희,편서영 충남대학교 1993 學生生活硏究 Vol.20 No.-

한국만화산업의 수출경쟁력 강화방안에 관한 연구

徐俊奭,徐敏敎 慶一大學校 1999 論文集 Vol.16 No.4

Recently, there has been rapid increase in Korean firms' export of cartoon products, reflecting the change of world and domestic economic environment. The purpose of this study are 1) to find out results of comparative study on cartoon industry between Korea and Japan 2) to evaluate possible implications for Korean firms' export of cartoon products and consider the effcient countermeasures of Korean firms.

국내은행들의 점포전략에 관한 연구

서준석,서민교 경일대학교 산업정보연구소 2000 産經硏究 Vol.6 No.2

경제위기 극복을 위한 금융산업의 구조조정이 본격적으로 진행되고 있다. 국내은행들은 금융환경변화에 적극적으로 대응해 나가는 한편, 내부적으로는 부실자산 축소 ·인력감축 등 수익 및 비용 구조를 개선하기 위해 다양한 노력을 기울이고 있다. 이 중에서도 적자점포의 통폐합 및 이전, 점포소형화, 점포신설 억제 등 코스트 절감을 위한 점포 리스트럭처링 작업이 대형 시중은행을 중심으로 강도높게 실시될 전망이다. 이러한 상황인데도 불구하고 우리나라의 은행점포전략에 대한 연구는 거의 없다는 점이다. 이와같은 상황하에서 본 연구의 목적은 첫째, 전문 ·특화 delivery system과 동해은행의 사례를 분석하고 둘째로, 국내은행의 점포전략 수립시 참조할수 있는 시사점 및 향후 연구방향에 대해 언급하였다.

관상동맥 누공에 의한 급성 심근 경색 1예

서유승,최재웅,송창섭,조용범,양진수,박준섭,정인수 대한내과학회 2003 대한내과학회지 Vol.65 No.2

관상동맥 동정맥루 기형은 매우 드문 질환으로 치료가 불필요한 경우가 대부분이나 coronary steal 현상으로 인해 증상이 발생하거나 합병증이 발생한 환자에 대해선 치료를 요한다. 최근에는 시술에 적합한 누공을 가진 선택된 환자군을 대상으로 카테터를 이용한 중재적 시술이 시행되어 수술적 치료와 유사한 결과를 얻고 있다. 저자들은 젊은 남자에서 관상동맥 동정맥루 기형과 동반된 급성 심근 경색증을 진단하여 비 수술적 방법인 카테타 코일 색전술로 성공적 치료 후 증상 및 심근 재관류에 호전을 보인 증례를 경험하였기에 문헌고찰과 함께 보고하는 바이다. We report a case of coronary fistula between the left anterior descending and main pulmonary artery complicating acute non-Q wave myocardial infarction. A 27-year-old man visited emergency department because of severe chest pain lasting two hours. The electrocardiogram showed ST segment elevation in precordial leads V3~6. Cardiac enzymes were as follows;CK-MB:36.44 IU/L T-T:0.489 ng/mL, CPK:542 IU/L, and LDH:475 IU/L. The thallium-201 dipyridamole stress perfusion scan showed perfusion defect and reversed redistribution in the anteroseptal wall. The coronary angiogram revealed coronary artery fistula between the proximal left anterior descending artery and main pulmonary artery without significant stenoses of coronary arteries. The result of ergonovine test was negative. After micro-coil embolization to the coronary fistula, symptoms were improved. Follow-up thallium-201 scan showed normalized blood flow in the left anteroseptal wall.

웹 기반 멀티미디어 농수산물 주문판매 시스템

서성채,최준용,방만원 木浦大學校 情報産業硏究所 1997 情報産業硏究誌 Vol.5 No.-

The high-speed communication backbone has the features that it is faster than any previous communication media, larger in the bandwidth and lower in the error rates. For cut-edge technical development and various service in the high-speed communication backbone, it is firstly required the technique that the multimedia informations such as texts, voices, pictures and videos are processed on real-time and then they are utilized through the connections. The future shopping and ordering system will be required as the dynamic and interactive system which can directly identify the process, size and shape of products and order, not as the static which have only texts data. And it will arise the need for the efficient management of multimedia DB. In this paper, We developed the multimedia order and sale system of agricultural and marine products. We expect that it enables to the home-shopping that users can search the informations of agricultural and marine products in home or office, and order the production after identifying with pictures and videos.

국내은행 데이터베이스마케팅전략에 관한 연구

徐俊奭 慶一大學校 1999 論文集 Vol.16 No.4

Recently, there has been rapid increase in database marketing between domestic banks and foreign banks, reflecting the change of world and domestic economic enviroment. The purpose of this study are 1) to find out comparative study on database marketing among Korean, Japanese and American banks 2) to evaluate possible implications for Korean banks's database marketing strategy and consider the effcient countermeasures of Korean banks.