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마찰력과 열처리에 따른 아크용사 및 아크용접된 Fe-Cr-B 합금 피복층의 변화
이찬규,유인석,김강형,구본흔,박맹로 國立 昌原大學校 産業技術硏究所 1995 産技硏論文集 Vol.9 No.-
Variations of arc thermal sprayed and arc welded Fe-Cr-B alloy coating with frictional loading and heat treatment were investigated by means of X-ray diffraction, optical microscopy, scanning electron microscopy, electron probe microanalysis and hardness test. The as-coated layers were shown to be crystalline state but peaks with the frictional loading largely disappeared in X-ray diffraction profiles. The splat is relatively wavy with the boundary in arc thermal spray coating. After heat treatment, the amount of porosity was found to be decreased and the intersplat distance was increased. As annealing temperature increased, interface layer for arc welding coating increased by the diffusion of Cr atoms. The wear type observed in arc thermal spray coatings is splat delamination. The hardness of the arc thermal spray coation layer was superior to that of the arc welding layer. Hardness of coated layer is reduced and microstructures become to be uniformed by the heat treatment.
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피혁 가공 폐기물로부터 동물성 유지 성분의 회수 및 재자원화 기술 연구
박천헌 ( Chan-heun Park ),백인규 ( In-kyu Paik ),윤종국 ( Jong-kook Yun ),최주현 ( Ju-hyun Choi ) 유기성자원학회 2001 학술대회 발표자료집 Vol.2001 No.1
피혁 제조 공정에서 발생되는 각종 피혁 가공 폐기물의 발생율은 원료피 기준 거의 50% 이상으로 국내의 경우 약 40만톤의 원료피를 가공하여 피혁을 제조하고 있으므로 여기서 발생되는 피혁 가공 폐기물은 연간 약 20만톤을 상회하고 있고 피혁산업이 발달할수록 고급 소재 및 기능성 소재의 수요 중대에 따라 피혁 가공 폐기물은 상대적으로 늘어날 것으로 전망된다. 현재 국내에서 배출되는 피혁 가공 폐기물들은 50% 이상의 수분을 함유한 동물성 유지 및 섬유상 단백질로 구성되어 있어 귀중한 유지 및 단백질 자원임에도 불구하고 이에 대한 재활용 기술이 없어 대부분 산업 폐기물로 소각하거나 단순 매립 처리하고 있다. 이로 인해 이들 피혁 가공 폐기물에 의한 환경오염 문제가 날로 심각해져 가고 있는 실정이며 피혁 가공 업계에서는 피혁 가공 폐기물에 대한 과다한 처리비용(4만원~6만원/Ton)이 소비되어 생산 원가 측면에서도 큰 부담이 되고 있다. 더욱이 Fleshing scrap과 같은 유기 성 폐기물의 경우는 부패성이 높아 적절하게 처리되지 않고 불법투기 될 경우에 발생하는 악취, 오수 누출 등에 의한 2차 오염의 발생됨으로 이러한 문제점을 해결하고자 재활용 실험을 실시하였다. 본 연구의 주요내용은 유기성 피혁 폐기물인 Fleshing scrap을 회수하여 수세, 분쇄 처리한 다음 반응기 상에서 다양한 Chemical 및 Enzyme을 처리하여 다양한 특성을 지닌 유지 성분을 분리하였다. 분리된 유지 성분은 Filtering, 탈색, 탈취, 정제 등의 후처리 공정을 거쳐 완성 제품으로 제조하였다. 실험 결과 사용된 Chemical과 Enzyme의 종류에 따라 분리된 유 지 성분 및 단백질 성분의 특성이 변화되는 것을 볼 수 있었다. 분리된 유지 성분의 활용은 유지 자체에 적절한 변형 공정(Sulphation reaction, Sulphitation reaction etc.)을 거쳐 피혁 제조 공정에 사용 시 1.70~1.95kg/㎟의 인장강도, 3.50~4.45kg/mm의 인열강도, 45~70%의 신장율, 20~35kgf의 파열강도, 1,000~1,500mgf의 유연도 및 3.5~4급의 내일광성을 나타내는 피혁 제조 약품을 합성하였다.
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박찬흔(Chan Heun Park),배수동(Soo Tong Pai),윤대성(Dae Sung Yoon) 대한소화기학회 1991 대한소화기학회지 Vol.23 No.4
Fourier's disease is an uncommon form of gangrene involving the scrotum and perineum with synergistic necrotizing fascitis. It was described first by Fournier, a French venerealogist and there are 3 findings characterizing the syndrome: 1) abrupt onset in a healthy male patient, 2) rapid progression to gangrene and 3) absence of a specific causative agent. Today, Fourniers gasngrene is recognized as a form of synergistic necrotizing fascitis secondary to a focus of perianal infection or urinary tract infection or local trauma as possible causal factors. Despite aggressive surgical and medical management Fourniers gangrene has a significatn mortality rate (7 to 50 percent in previous studies). Recently we have experienced 1 case of Fourniers gangrene in a 72 years old male patient who presented us with severe abdominal pain and dyspnea of several days duration. The patients abdominal condition was aggravated progressively, so we have explored the abdomen in emergency with the impression of panperitonitis of unknown origin and found severe inflammation in retroperitoneum, especially in pelvic cavity. Bacterial culture of the paritoneal fluid revealed as E. coli. The patients general condition was not improved significantly even after the operation, and the perianal fluctuation bacame definite. We drained the perianal abscess 12 days after the operation, then the patients condition was improved. The patient was discharged with healing stage of perianal abscess, but the anal sphincter function was still poor.
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박찬흔(Chan Heun Park),배수동(Soo Tong Pai),임동현(Dong Hyeon Lim),조지웅(Ji Woong Jo) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.2
The clinical study on 31 cases of acute pancreatitis were carried out during the period between October 1986 and December 1991. The male patient outnumbered female by the ratio of 2:1. The most cornmon etiology was alcoholism followed by biliary tract disease and trauma. The majority of the cases presented with chief complaints of abdominal pain, and less common symptoms were nausea, vomiting, fever and jaundice. Among 27 cases who had elevated serum amylase on admission, it turned to normal in 19 cases within 3-6 days of hospitalization. Bacterial cultures from peritoneal fiuid were done on 7 ceases during the laparotomy: Two case yielded positive culture. Assessment of the cases were made according the Ranson's criteria and it was found that the mortality rate was generally parallel to the number of signs each patient developed. Complications developed in 12 patients (40%), and the commonly seen were pleural effusion, pulmonary and renal insufficiency. Of the 10 cases who were operated because of aggravating condition, 4 cases died postoperatively. All mortality cases developed respiratory and renal insufficiency followed by multiple organ failure.
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Seon Min Park,Eun Young Kim,Yong Lai Park,Chan Heun Park 한국유방암학회 2022 Journal of Breast Disease Vol.10 No.1
Purpose: This study investigated the correlation between non-mass-like enhancement (NME) observed on preoperative breast magnetic resonance imaging (MRI) and the actual pathological size of breast cancer. We further examined the effect of NME on the positive resection margins during partial mastectomy. Methods: We retrospectively collected data from breast cancer patients who underwent surgery between January 2018 and September 2020. Patients were divided into two groups based on their MRI findings: NME and no-NME (mass-like lesion only) groups. The medical records, including MRI findings and clinicopathological information of patients, were collected retrospectively, and correlations with pathologic results were analyzed. Propensity score matching was applied to develop comparable cohorts of the NME group and no-NME group. Results: This study included a total of 317 patients, with 66 and 251 patients in the NME and no-NME groups, respectively. The mean pathologic size of invasive lesion was significantly smaller than the mean lesion size in the NME group (1.55±1.39 cm vs. 3.45±1.81 cm, p<0.001). The mean pathologic size of ductal carcinoma in situ (DCIS) lesions was larger than that in the NME group but without statistical significance (3.91±2.67 cm vs. 3.50±1.79 cm, p=0.326). In the NME group, NME estimated DCIS size to within 1 cm in 20 patients (30.3%) and overestimated invasive lesion size by more than 1 cm in 31 patients (46.9%). NME (vs. no-NME; odds ratio [OR], 2.967; 95% confidence interval [CI], 0.878-10.025) showed a tendency to predict positive resection margins, but this was not statistically significant (p=0.080). Conclusion: NME findings on MRI showed a similar extent of DCIS lesions. NME findings on preoperative MRI should be considered an important factor for measuring the extent of tumors, especially in DCIS patients.
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