Comparison of the Crystallization Behavior of Silica Between Mg and Al‑Phosphate Used in Tension Coatings of Grain‑Oriented Electrical Steel

Hyung‑Ki Park,Min‑Soo Han,Chang‑Hwan Chang,Jong‑Tae Park,박창수,Hyung‑Don Joo 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3

The effect of the phosphate component on the thermal stability of tension coatings was investigated with a focus on thecrystallization behavior of amorphous silica in the tension coating. After stress-relief annealing, core loss of samples coatedwith a Mg-phosphate was improved, while that coated with an Al-phosphate was deteriorated. The domain wall spacing ofthe samples coated with Mg- and Al-phosphates was respectively increased and decreased after stress relief annealing. Thismeans that the stress relief annealing did not much diminish the tensile stress for Mg-phosphate coating but much diminishedthe tensile stress for Al-phosphate coating. Based on FTIR and XRD results, we found that the crystallization temperatureof silica with Al-phosphate was lower than that of silica with Mg-phosphate. The crystallization of silica was accompaniedby an abrupt volume change, which formed cracks in the tension coating and deteriorated the tensile stress.

악성 점막하 종양과의 구별이 어려웠던 Gastritis Cystica Profunda 1예

선제형,박진석,한민석,김수항,김우진,박인형,이숭,유종선,박찬국 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.3

Gastritis cystica profunda (GCP) is a rare disease characterized by gastric foveolae elongation along with hyperplasia and cystic dilatation of the gastric glands extending into the tissue beneath the submucosa. GCP mainly develops at the gastroenterostomy stoma but can arise in a stomach that has not undergone surgery. The proposed pathogenesis is related to chronic inflammation, ischemia and the presence of a foreign body. GCP may present as a submucosal tumor, Polyp or a giant gastric mucosal fold. Endoscopic ultrasonography (EUS) is an effective diagnostic method for differentiating GCP from protruding and elevated gastric lesions. We report a case of GCP along with the endoscopic and EUS findings that were indistinguishable from a malignant submucosal tumor.

당뇨병 환자에서 발생한 대장 가성폐색증 1예

이재형,강준구,박준성,이창범,박용수,김동선,함준수,김태화,안유헌,박충기 대한당뇨병학회 2002 임상당뇨병 Vol.3 No.2

가성 장폐색은 기계적인 폐색부위가 없이 복부팽만과 구토 등 장폐색의 증상과 징후가 나타나는 질환을 말하며, 선행원인을 찾을 수 없는 원발성 가성 장폐색과 다른 질환에 이차적으로 발생하는 속발성 가성 장폐색으로 나눌 수 있다. 당뇨병은 잘 알려진 속발성 가성 장폐색의 원인이지만 실제로 당뇨병에 의한 가상 장폐색의 발생 빈도는 매우 드문 것으로 보이며, 가성 장폐색의 적절한 치료에 대해서는 아직 논란이 있다. 저자들은 2형 당뇨병 환자에게 대장에 국한된 급성 가성 장폐색을 진단하고 보존적 치료를 시행하여 호전된 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Colonic pseudo-obstruction is a disorder characterized by gross dilatation of the colon in the absence of any anatomic lesions, which obstructs the flow of the intestinal contents. Diabetes is a well known cause of secondary pseudo-obstruction but its prevalence in rare and not well understood. A 59-year-old woman patient was admitted due to abdominal distension and nausea of a day's duration. She was diagnosed with diabetes 15 years ago, but the condition had been poorly controoled. On the abdominal radiographs, there were marked small and large bowel dilatation with the, exception of the descending colon. Our initial diagnosis was mechanical obstruction, but the possible causes were not found. Also, we could not find another cause of the secondary pseudo-obstruction, with the exception of diabetes mellitus. Thus, she was diagnosed with a diabetes induced intestinal pseudo-obstruction. The colonic dilatation was resolved by conservative management and she became comfortable in 10 hospital days, and was subsequently discharged.

플라즈마 표지소자의 제작

이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-

An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.

곰쓸개 복용 후 발생한 육안적 혈뇨와 신유두부 괴사증 1예

김우진,한민석,김수항,박인형,박진석,선제형,홍세인,박옥영,신정현,이숭,신병철 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.3

Renal papillary necrosis occurs most commonly in association with urinary tract infection, diabetes mellitus, sickle cell disease, vascular disease, and analgesic nephropathy. Clinical presentation may be related to symptoms of pyelonephritis such as flank pain, renal colic, hematuria, Proteinuria, recurrent fever. The necrotic tissue may be sloughed off, and the diagnosis can sometimes be made by finding piece of renal medullary tissue in the urine. Pyelography may demonstrate cavities and sinuses in the resion of papillae. Anuria & oliguria can lead to the acute renal failure, and especially prognosis and progress may be affect influenced by urinary infection. We report a case of renal papillary necrosis with ingestion of bear gallbladder. On pyelography, Persistent contrast is diagnostic clue of renal papillary necrosis. This case is not be related to urinary tract infection, but occurred acute renal failure. Expectant treatment was gone.

스트레스와 건강행위 실천과의 연관성

박은영,박형철,박경수,손석준 大韓家庭醫學會 2000 Korean Journal of Family Medicine Vol.21 No.11

사회환경교육의 교육과정 표준화 모형 및 통합프로그램 개발연구

박석순,최돈형,성효현,허명,강명희,이숙임,남상준 이화여자대학교 환경문제연구소 1998 이화환경연구 Vol.2 No.-

This paper presents the development of standardized modules and an integrated program which will be used for social environmental education. The study objectives are to develop modules which are based on various environmental topics, to relate the regional environmental topics to the educational modules and program, and to include the demand of students in the modules and program. Literature and questionary surveys, as well as, module development method were utilized as research tools. The titles of developed modules are "The Green Plant Earth," "Unexpected Resources: Save Resources and Recycle", "Water as the Mother of All Lives", "The Blue Sky with Clean Air", and "Soil as the Home of All Living and Non-living Things". It is hoped that the developed modules and program are utilized as course materials and curriculum for social environmental education in various educational institutes. The study results will be materialized as multimedia in near futher.

공기 중 toluene diisocyanate의 포집방법에 따른 요중 toluene diamine의 관련성

박근철,김치년,김현수,김형렬,노재훈 한국산업위생학회 2003 한국산업보건학회지 Vol.13 No.1

Toluene diisocyanate(TDI) has been known the materials which is induced occupational asthma, is mostly used by the materials of industrial polyurethane, excreted as toluene diamine(TDA) in case of occurring metabolism in the human body when it inhaled. This research is demonstrated to make scrutiny into efficiency of two differentways of sampling in comparison with the cocentration after make use of the open cassette holder and the modified 2-piece cassette holder which are originaly existing to doing sampling 2,4-TDI as 2,6 TDI in the air, and to present more adequate way to TDI sampling in the air and to present more adequate way to TDI sampling in the air from comparing concentration TDA in a worker's urine with concentration of TDI which is being sampling each ways And this study want to grasp the influence for TDA excretion by exposing TDI from the general character of workers. The study was experimented on the 22 workers from the factory where is pperated paining work using by paints from poly urethane. This study was performed to identify the personal character of workers by using the questionnaire. analysed TDI from 44 sample each in the middle of morning and afternoon and TDA from the 17 workers by take their urine. Open cassette holder is manufactured to face the filter with the outside by remove the modified 2-piece cassette holder eliminated he middle of section and top of the upper holder. As a result of analysis, the concentration of TDI in the air is higher on the mokigied 2-piece cassette holder than the open cassette holder for sampling, There was no different on the concentration of urinary TDA by personal character. The concentration of TDI in the air had a relation with the concentration of urinary TDA no matter what kind of sampling method used, but the sampling by modified 2-piece cassette holder had more relation than sampling by open face cassette holder. As a result of this experiment, the concentration of TDI by sampling from the each cassette holder has shown to us significant relation with the concentration of urinary TDA.

농산물 소독과정에서 브롬화메틸에 노출된 근로자에게 발생한 신경병 2례

박태혁,김정일,손지언,김종국,김형수,정갑열,김준연 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.4

목적 : 농산물 소독과정에서 브롬화메틸에 노출된 근로자에게 발생한 신경병 2례 보고. 방법 : 피로감, 전신무력감, 어지럼증, 보행장애 등의 증상을 주소로 내원한 브롬화메틸을 사용하여 방역작업에 종사하는 건강한 20세와 18세의 근로자를 대상으로 혈액검사, 신경정도 및 근전도검사, 뇌자기공명영상 등의 임상검사와 작업력조사를 시행하였다. 결과 : 1례에서 뇌자기공명영상에서 연수와 소뇌의 양측 측충부의 고신호강도가 관찰되었고 11일 후의 추적조사에서 동일 부위의 고신호강토가 감소된 소견이 관찰되었으며 뇌병증으로 최종 진단되었다. 다른 1례는 신경전도검사에서 다발성 신경병 소견과 뇌유발전위검사에서 우측 하부 뇌간부위 병소가 관찰되었고 뇌병증 및 말초신경 병으로 최종 진단되었다. 결론 : 근로자들의 증상은 소독과정에서 브롬화메틸 노출로 인한 신경 병으로 판단되며 훈증소독과방역작업에 종사하는 근로자들의 실태조사와 안전에 대한 대책이 시급하다고 하겠다. Objectives : To report two cases of neuropathy due to methyl bromide intoxication. Methods : Workers, engaged in the fumigating process, complained fatigue, general weakness, ataxia, and hypersomnia. We evaluated them with blood tests, neurophysiologic studies and MRI and investigated their occupational history. Results : Increased signal intensities were found in the medulla oblongata and paraver mian of cerebellum in MRI and after 11 days, high signal intensities were reduced in the following MRI. In the other case, polyneuropathy and rlght lower brainstem lesion were observed In the NCV and BAEP studies. Conclusions : We confirmed that worker's symptoms were related to methyl bromide exposure in the fumigation. It is necessary that we should evaluate present condition of fumigating process and prepare appropriate methods to protect workers engaged in the fumigation.

Ti-6Al-4V 합금의 표면개질에 의한 calcium phosphate의 형성

박은진,김도균,김교한,고 융부,김형일,정용수 대한치과기재학회 2000 대한치과재료학회지 Vol.27 No.1

The purpose of this study os to investigate the formation of calcium phosphate on Ti-6Al-4V surface on aqueous solutions containing phosphate and calcium ions. The surface of Ti-6Al-4V specimens were treated in phosphate buffered solutions for 3 days followed by immersion in calcium phosphate buffered solutions for 10 days. These solutions have different concentration and pH(pH 5.8, 7.0, 8.0) one another. Then, the specimens treated with P and Ca ions and control group without surface treatment were immersed in Hanks' balanced solution for 30 days to make sure the effectiveness of this surface treatment. All specimens were characterized using scanning electron microscopy(SEM), X-ray diffractometry(XRD) and Fourier transform infrared spectrophotometry(FT-IR). The amount of crystallized particles formed on the specimens by surface treatment was significantly increased in all experimental conditions as compared with that immersed only in Hanks' solution. Dense granular shaped precipitates were observed on the surface and these particles were recognized as calcium phosphate similar to HA(hydroxyapatite) or TCP(tri-calcium phosphate).