유리섬유 강화 플라스틱 성형에서 섬유의 단면형상과 사출성형조건이 제품의 휨변형과 광택도에 미치는 영향

한일용,박성현,정민수,김태균,박동삼 한국정밀공학회 2023 한국정밀공학회지 Vol.40 No.2

SFT, which has a high glass fiber content, is one of the effective methods to replace metal and secure weight reduction and price competitiveness. Also, paintless injection molding in which a functional pattern is applied to the mold surface can eliminate the cost of painting. In this study, three types of SFTs were manufactured by adding round glass fibers measuring Φ7 and Φ10 μm and flat glass fiber measuring 27 × 10 μm for the experiment. DOE (Design of Experiment) was conducted to confirm the change in the warpage of the product and the gloss of the micro pattern due to the cross-sectional shape of glass fibers and the major injection conditions. Based on the results, it was identified that the flat SFT had a very small warpage compared to the round SFTs, and the holding pressure was the main factor in the warpage of all three SFTs. The Φ7 μm SFT had the largest gloss value, and the Φ10 μm SFT and the flat SFT had similar average values. All SFTs demonstrated an enormous change in gloss according to the change in mold temperature. The flat SFT had the smallest standard deviation in both warpage and gloss.

후천성 폐탈출증 -2례 보고-

한일용,이양행,황윤호,Han, Il-Yong,Lee, Yang-Haeng,Hwang, Yun-Ho 대한흉부심장혈관외과학회 1997 Journal of Chest Surgery (J Chest Surg) Vol.30 No.11

Lung hernia is defined as a protrusion of lung parenchyma beyond the confines of the musculoskeletal thorax. To date, less than 300 cases have been reported in the literature. The patients were 37 & 57-year-old men who had traumatic rib fractures in the past, whose chief complaint was a painless soft bulging mass increased in size during expiration or coughing and diminished during inspiration or quiet breathing. The primary repair was performed without any p stoperative recurrance. We report two cases of acquired herniation of lung first time in Korea with a brief review of literature. 폐탈출증은 근골격으로 구성된 흉곽 밖으로 폐실질이 빠져나와 돌출되는 것으로, 최근까지 문헌으로 보고된 예는 300 례 미만이다. 환자는 늑골 골절을 포함한 외상을 입었던 과거력을 가진 37세와 57세 남자 이며 주소는 전흉부에 무통성의 부드러운 종괴로 호기시나 기침시 그 크기가 증가하였고, 흡기시 혹은 조용한 호흡시에는 감소하였다. 수술은 흉벽 결손에 대한 일차 봉합술을 시행하였으며, 술후 재발은 아직 까지 관찰되지 않았다 저자들은 지금까지 국내 발생보고 예가 없는 후천성 폐탈출증 2례를 수술 치험하였기에 문헌고찰과 함께 보고하는 바이다.

단독 대동맥판막 치환술의 중기 성적과 그 위험인자에 대한 분석

한일용,박재민,전희재,윤영철,이양행,황윤호,조광현 대한흉부외과학회 2005 Journal of Chest Surgery (J Chest Surg) Vol.38 No.2

Background: The aims of this paper were to review the mid term clinical results and to analyze the preoperative risk factors of isolated aortic valve replacement (AVR). Material and Method: Between January 1992 and February 2003, 80 patients underwent isolated AVR. 58 were male and 22 were female patients, raging from 12 to 75 years of age (mean: 46.8±13.0 years). 74 patients except one early death and 5 follow-up loss were contacted by OPD or by telephone. The mean duration of follow-up was 44.2±29.7 months and the total cumulative period was 272.8 patient-year. Result: The complications in hospital occurred in 35 cases : 12 wound problems (11 superficial, 1 deep), 11 arrhythmias (9 temporary, 2 persistent), 3 low cardiac output, and so forth. The late deaths were 4 cases : the heart-related deaths were 2 cases (0.7%patient-year). Conclusion: The risk factors that influenced the early mortality and morbidity were older age (>60 years)(p=0.04), poor preoperative NYHA functional class (>3) (p=0.048), high preoperative serum creatinin level (>1.2 mg/100 ml)(p=0.031), long operation time (aortic clamping time>90 min)(p=0.042). The same factors influenced the late mortality and morbidity. Freedom from valve-related complication was 86.4±5.3%, actuarial survival rate were 96.8±2.3% at 3 years and 90.8±4.6% at 10 years. 배경: 단독 대동맥판막 치환술의 중기 임상성적과 그 예후에 영향을 미칠수 있는 인자들을 본원의 증례로 분석해 보고자 하였다. 대상 및 방법: 1992년 1월부터 2003년 2월까지 단독 대동맥판막 치환술을 시행받은 80명의 환자를 대상으로 하였다. 대상환자는 남자 58명, 여자 22명이었으며 연령분포는 최저 12세에서 최고 75세로 평균연령은 46.8 13.0세였다. 술후 급성심근경색으로 인한 조기사망이 1예(1.3%)였으며, 1명의 조기사망예와 연락이 되지 않는 5예를 제외한 74명을 외래추적 및 전화설문을 시행하여 최단 6개월에서 최장 117개월까지 평균 44.2 29.7개월을 추적조사하였으며 총누적기간은 272.8 환자-년이었다. 결과: 재원기간내 합병증은 창상감염 12예(표재성감염: 11예, 종격동염: 1예), 부정맥 11예(일시적: 9예, 지속적: 2예), 저심박출증 3예, 늑막삼출 3예, 섬망 3예, 출혈으로 인한 재수술 2예 등이 있었다. 판막관련 만기 합병증은 총 7예(2.6%/환자-년)으로 항응고제 관련 출혈이 2예(0.7%/환자-년), 치환판막 심내막염이 2예, 경도의 판막주변부 누출이 2예, 치환판막기능부전으로 대동맥판막 재치환술을 받은 경우가 1예(0.4%/환자-년) 등이었다. 만기 사망은 4명이었으며 그중 담도암과 위암으로 인한 사망이 각각 1예씩 있었으며 술후 4개월에 치환판막감염 및 뇌전색증으로 인한 사망 1예, 술후 38개월에 심부전으로 사망한 1예가 있어 심장과 관련있는 사망은 2예(0.7%/환자-년)였다. 결론: 60세 이상의 연령(p=0.04), 술전 NYHA 기능분류(III, IV)(p=0.048), 술전 크레아틴 농도(>1.2 mg/100 ml)(p=0.031), 대동맥교차차단시간(>90분)(p=0.042)이 통계적으로 유의하게 조기사망 및 유병률에 연관이 있었다. 만기 사망 및 유병률에 영향을 주는 것으로는 60세 이상 연령, 술전 NYHA 기능분류(III, IV), 술전 크레아틴 농도(>1.2 mg/100 ml), 총체외순환시간(>120분) 등이 통계적으로 유의하였다. 판막관련 합병증 비발생률은 86.4 5.3%였으며, Kaplan-Meier식 보험통계적 10년 생존률은 90.8 4.6%였다.

폐 선암 세포주 Calu3로부터 선택된 종양 특이 인간 항체 분절, LA-calu-1의 제작

한일용 대한암예방학회 2010 Journal of cancer prevention Vol.15 No.4

For developing the new methods of treatment and diagnosis, lung adenocarcinoma specific human monoclonal antibody was generated using the human naive antibody phage display library. By the subtractive cell panning, phage antibodies that react to lung adenocarcinoma cell line, Calu3, but not react to normal lung epithelial cell, Wi-26, were selected. Reactivity to Calu3 of selected clones was tested with flow cytometry. Selected clones were analyzed with restriction enzyme and nucleotide sequencing. Tissue specificity and tumor specificity was tested with flow cytometry. Four clones were selected by flow cytometry analysis of 60 clones rescued after 4th panning. By the BstN1 fingerprinting and nucleotide sequencing, 4 clones were same clone, so it named to LA-calu-1. LA-calu-1 react to liver and lung origin cells, but not react to normal cell lines, LS513 and Wi-26. In this study, I generated LA-calu-1 that reacted to hepatocarcinoma and lung adenocarcinoma cell lines. In further study, I will confirm the probability of application in cancer treatment and diagnosis. (Cancer Prev Res 15, 268-276, 2010)

항공,관광서비스 산업의 새로운 경영 패러다임: Revenue Management : 구주노선전략설정을 위한 항공 협정 연구

한일용 한국항공경영학회 2006 한국항공경영학회 춘계학술대회 Vol.2006 No.-

항공 운송 수요 특성 연구

한일용 한국항공경영학회 2006 한국항공경영학회 추계학술대회 Vol.2006 No.-

The growth prospect of the Korean domestic market unfortunately looks quite weak. This can be seen due to the limitations on competitiveness in terms of fare, journey duration, security concerns, and complicated formality in process, compared to other modes of travel in the domestic market. Diversion of excess capacity from domestic operations is necessary for the Korean carriers. Incheon International airport (ICN) was built to be developed as an international hub within the region. Many points in China and Japan can be more conveniently served through ICN compared to competing major gateways in China and Japan in terms of fare and passenger convenience. Extensive networks linking many cities in the area give ICN great potential. Various actions such as schedule coordination and operating pattern of the airport and so on, must be taken to realize the potential. Very positive traffic growth on the route between Europe and North East Asia (including China) is expected in accordance of the forecast produced by major organizations such as ICAO, WEFA, and the major manufacturers including Boeing and Airbus. Recent development in Korea shows concurring trend. According to historical traffic data, the European market was found to be very small with regards to the overall air traffic in terms of the number of passengers carried. Considering the size of the European market and economic relations with Korea, the market is unsaturated. Therefore, the market potential between Korea and Europe, and North East Asia and Europe is very high. It is necessary for Korean carriers to develop strong partnership with European alliance partners, which are using the European destination airport as its operating hub. Due to the long-haul characteristics of the routes between Korea and Europe, there are many passengers that will have onward journeys. With a strategic alliance partnership, both carriers may have privileges such as code-sharing, schedule coordination, seamless passenger handling, facility share, and so on. Serious consideration and planning of the effective use of strategic alliances which benefits both carriers should be made.

중복판막수술후 조기성적에 영향을 미치는 인자에 관한 연구

한일용,조용길,황윤호,조광현 대한흉부심장혈관외과학회 1998 Journal of Chest Surgery (J Chest Surg) Vol.31 No.3

인제대학교 부산백병원 흉부외과학교실에서는 1985년 10월부터 1996년 7월까지 약 10년간 총 124례의 중복판막수술을 받은 환자를 대상으로 성별, 나이, 술전 X-선 심흉곽비, 심도자검사상의 평균폐동맥압, 술전 심장초음파 검사상 좌심실구출률, 술전 NYHA 기능분류등급, 치환한 판막의 수, 대동맥차단시간과 총체외순환시간, 술후 중한 합병증 발생 및 조기사망 유무를 조사하고 수술후 조기성적에 영향을 미치는 인자들을 분석하였다. 환자중 남자가 53례, 여자가 71례로 성비는 1:1.4 였으며, 술전 임상증상으로 NYHA 기능분류상 등급 I이 3명(2.4%), 등급 II가 41명(33.1%), 등급 III가 60명(48.4%), 등급 IV가 20명(16.1%)이었고 심전도검사상 술전 심방세동이 76명(61.3%), 술전 뇌색전증 병력이 5례(4.0%), 이전에 심장수술을 받은 경우가 7례(5.7%)였다. 술후 조기사망률은 8.1%, 술후 중한 합병증 발생율은 21.8%였다. 판막수술은 승모판막과 대동맥판막을 동시에 치환한 례(57례), 승모판막치환과 삼첨판륜성형술을 한 례(48례), 승모판막과 삼첨판막을 동시 치환한 례(2례), 그리고 승모판막치환과 대동맥판막성형술을 한 례(3례)등이 있었다. 수술후 조기 임상경과에 따라 사망례를 포함한 중한 합병증을 동반한 군(A군, 27례)과 특별한 문제가 없었던 군(B군, 97례)으로 분류하고, 또 조기사망군(10례)과 생존군(114례)으로 분류하여 각각의 분류군간에 통계적으로 유의한 위험인자들이 있는지 분석하였다. A군에서 발생한 중한 합병증은 저심박출증, 종격동염, 심장파열, 심실부정맥, 패혈증 등이었다. A군과 B군의 비교에서는 대동맥차단시간(A군:153.4$\pm$42.4분, B군:134.0$\pm$43.7, p=0.042), 총체외순환시간(A군:187.4$\pm$65.5분, B군:158.1$\pm$50.6분, p=0.038), 그리고 NYHA 기능분류등급(I등급:33.3%, II등급:9.7%, III등급:20.0%, IV등급:50.0%, p=0.004)에서 유의한 차이가 있었다. 술후 조기사망군(10례)과 생존군(114례)의 비교에서는 연령(사망군:45.2$\pm$8.7세, 생존군:37.2$\pm$11.6세, p=0.036), 성별(여자:12.7%, 남자:1.9%, p=0.043), 대동맥차단시간(사망군:167.1$\pm$38.4분, 생존군:135.7$\pm$43.7분 p=0.030), 그리고 술전 NYHA 기능분류등급(I등급:0%, II등급:4.9%, III등급:1.7%, IV등급:35.0%, p=0.001)에서 유의한 차이가 있었다. 이상으로 볼 때 NYHA 기능분류에서 술전의 임상상태가 중할수록 조기성적에 나쁜 영향을 미치므로 환자의 증상이 악화되기 전에 조기수술이 요망되며, 개선된 수술수기나 심근보호방법등으로 대동맥차단시간과 총체외순환시간을 효율적으로 줄일수 있다면 중복판막수술후 조기성적을 향상시킬 것으로 사료된다. To define the risk factors affecting the early major morbidity and mortality after multiple- valve operations, the preoperative, intraoperative and postoperative informations were retrospectively collected on 124 consecutive patients undergoing a multiple-valve operation between October 1985 and July 1996 at the department of Thoracic and Cardiovascular Surgery of Pusan Paik Hospital. The study population consists of 53 men and 71 women whose mean age was 37.9$\pm$11.5(mean$\pm$SD) years. Using the New York Heart Association(NYHA) classification, 41 patients(33.1%) were in functional class II, 60(48.4%) in class III, and 20(16.1%) in class IV preoperatively. Seven patients(5.6%) had undergone previous cardiac operations. Atrial fibrillations were present in 76 patients(61.3%), a history of cerebral embolism in 5(4.0%), and left atrial thrombus in 13(10.5%). The overall early mortality rate and postoperative morbidity was 8.1% and 21.8% respectively. Among the 124 cases of multiple-valve operation, there were 57(46.0%) of combined mitral valve replacement(MVR) and aortic valve replacement(AVR), 48(38.7%) of combined MVR and tricuspid annuloplasty(TVA), 12(9.7%) of combined MVR, AVR and TVA, 3(2.4%) of combined MVR and aortic valvuloplasty, 2(1.6%) of combined MVR and tricuspid valve replacement, and others. The patients were classified according to the postoperative outcomes; Group A(27 cases) included the patients who had early death or major morbidity such as low cardiac output syndrome, mediastinitis, cardiac rupture, ventricular arrhythmia, sepsis, and others; Group B(97 cases) included the patients who had the good postoperative outcomes. The patients were also classified into group of early death and survivor. In comparison of group A and group B, there were significant differences in aortic cross-clamping time(ACT, group A:153.4$\pm$42.4 minutes, group B:134.0$\pm$43.7 minutes, p=0.042), total bypass time(TBT, group A:187.4$\pm$65.5 minutes, group B:158.1$\pm$50.6 minutes, p=0.038), and NYHA functional class(I:33.3%, II:9.7%, III:20%, IV:50%, p=0.004). In comparison of early death(n=10) and survivor(n=114), there were significant differences in age(early death:45.2$\pm$8.7 years, survivor:37.2$\pm$11.6 years, p=0.036), sex(female:12.7%, male:1.9%, p=0.043), ACT(early death:167.1$\pm$38.4 minutes, survivor:135.7$\pm$43.7 minutes, p=0.030), and NYHA functional class(I:0%, II:4.9%, III:1.7%, IV:35%, p=0.001). In conclusion, the early major morbidity and mortality were influenced by the preoperative clinical status and therefore the earlier surgical intervention should be recommended whenever possible. Also, improved methods of myocardial protection and operative techniques may reduce the risk in patients with multiple-valve operation.

Bi-계 고온초전도 선재의 Jc 향상에 관한 연구(Ⅰ)

정대영,오영우,한일용 慶南大學校 附設 工業技術硏究所 1992 硏究論文集 Vol.10 No.-

Ag가 피복된 Bi-계 고온 초전도 선재의 임계전류밀도(Jc)향상을 위하여 분말 충진법과 아울러 압연과 소결의 혼합공정의 반복법을 사용하였다. 선재에서 높은 Jc를 얻기 위한 요인으로는 높은 고온상(Bi-2223상)분율, 방향화된 미세조직, 입계에선의 강한 결합, 미립의 비 초전도상의 균일한 분포등이다. 압연을 통하여 유된 입자의 방향적 배열화에 의하여 weak-link는 상당히 제거될 수 있었다. 본 연구에서 얻어진 가장 높은 Jc는 77K와 OT에서 6,350 A/cm²의 값이었다. In order to improve the critical current density(Jc)by obtaining well grain-aligned morphology, Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O superconducting tapes were prepared using the powder-in-tube method and a repeatition of the combined process of rolling and sintering. Key factors for obtaining high Jc in the tapes are known to be high content of hegh-Tc phase(Bi-2223 phase), well grain-aligned morphology, good bonding at grain boundaries and uniform dispersion of nonsuperconducting particles. The weak-links could be considerably eliminated by directional grain-alignment induced by rolling. The highest Jc obtained in the present study was 6,350 A/cm²at 77K and OT.

Effect of Cross Section of Glass Fiber and Injection Conditions on the Tensile Strength in GFRP Injection Molding

한일용(Il Yong Han),박성현(Sung Hyun Park),정민수(Min Soo Cheong),김태균(Tae Kyun Kim),박동삼(Dong Sam Park) Korean Society for Precision Engineering 2022 한국정밀공학회지 Vol.39 No.12

Bi-계 고온 초전도 선재의 Jc향상에 관한 연구((II)

한일용,정대영,오영우 慶南大學校 附設 工業技術硏究所 1993 硏究論文集 Vol.11 No.-

Powder in tube 방법과 pressing 및 소결의 혼합공정의 반복법을 이용하여 Ag로 피복된 Bi(Pb)-Sr-Cu-O선재를 만드는데 있어서 2223상의 서로 다른 두가지 분말을 사용하였다. 보다 낮은 2223상을 함유하는 분말을 사용해서 만든 선재는 77.3K와 OT에서 Jc가 1*10⁴A/㎠임을 보여주었다. 두 선재의 XRD patterns의 비교, 미세구조, 전기적 성질에 의해서 얻어진 결과는 소량의 2212상의 존재와 최종 pressing후 소결 과정 동안 얻어진 Ca, Cu-rich액상을 형성하는 상은 잘 배열된 2223상의 입자들간의 향상된 결합과 pressing공정 중에 생긴 미세균열의 제거는 치밀한 미세조직과 높은 Jc를 나타내었다. Two powders different in the 2223 phase content were used to prepare Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O tapes by using the power-in-tube method and a repitation of the combined process of pressing and sintering. The tapes prepared using the power with lower 2223 phase content showed a Jc of 1*10⁴A/㎠ at 77.3K and O T. The results obtained by comparing XRD patterns, micromorphology, electrical properties in both tapes, indicated that the presence of a little amount of 2212 phase and Ca, Cu-rich liquid forming phase during the sintering after the final pressing is critical in connecting and eliminating the well aligned 2223 phase grains and microcracks induced by the pressing process, respectively, resulting in a highly densified morphology and a high Jc.