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분말사출성형 시 분말 혼합체의 유동성 시뮬레이션을 통한 투광성 알루미나 소결체의 특성 연구
김형수,변종민,김세훈,김영도,Kim, Hyung Soo,Byun, Jong Min,Kim, Se Hoon,Kim, Young Do 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.3
Translucent alumina is a potential candidate for high temperature application as a replacement of the glass or polymer. Recently, due to the increasing demand of high power light emitting diode (LED), there is a growing interest in the translucent alumina. Since the translucent property is very sensitive to the internal defect, such as voids inside or abnormal grain growth of sintered alumina, it is important to fabricate the defect-free product through the fabrication process. Powder injection molding (PIM) has been commonly applied for the fabrication of complex shaped products. Among the many parameters of PIM, the flowability of powder/binder mixture becomes more significant especially for the shape of the cavity with thin thickness. Two different positions of the gate were applied during PIM using the disc type of die. The binder was removed by solvent extraction method and the brown compact was sintered at $1750^{\circ}C$ for 3 hours in a vacuum. The flowability was also simulated using moldflow (MPI 6.0) with two different types of gate. The effect of the flowability of powder/binder mixture on the microstructure of the sintered specimen was studied with the analysis of the simulation result.
주철분말의 소결성에 (燒結性) 미치는 산화철 (酸化鐵) 첨가의 효과
김형수,김철범,나형용 ( Hyung Soo Kim,Chul Bohm Kim,Hyung Young Ra ) 한국주조공학회 1990 한국주조공학회지 Vol.10 No.1
N/A In order to lower the cabon content of sintered products below the solubility of austenite, Fe-oxide was added to cast iron powder of which matrix was pearlite. And the effects of it on some sintering properties and mechanical properties were investigated. Roughly speaking, the linear shrinkage, density, and tensile strendth of sintered properties increased as the sintering temperature became higher, the size distribution of powder became finer, and the amount of Fe-oxide added became less. The maximum tensile strength of sintered products was 78㎏f/㎟ more or less, of which carbon content was 1.4% and sintering temperature was 1180℃.
주철분말의 소결조직에 (燒結組織) 미치는 산화철 (酸化鐵) 첨가의 효과
김형수,김철범,나형용 ( Hyung Soo Kim,Chul Bohm Kim,Hyung Yong Ra ) 한국주조공학회 1990 한국주조공학회지 Vol.10 No.2
N/A The microstructures of sintered products of Fe₂O₃or Fe₃O₄-Oxide added cast iron powder was investigated. And the effects of particle size distribution was investigated too. As the result, the structures of sintered products did not related to the species of Fe-Oxide. Th porosity of sintered products was decreased in size and spherodized with increasing sintering temperature, decreasing Fe-Oxide quantity. Fe-Oxide itself did not hinder sintering of cast iron powder particularly, therefore sintering could be occurred without termination of reduction of it. And the sintered products of finer particle size distribution had finer and more spherodized porosity, and had minimized the deviation of size and shape of porosity.
Laser Doppler Flowmetry를 이용한 치은혈류량에 관한 연구
김형수,이장희,송형근,김병옥,한경윤,Kim, Hyung Soo,Lee, Zang-Hee,Song, Hyung-Geun,Kim, Byung-Ock,Han, Kyung-Yoon 대한치주과학회 1998 Journal of Periodontal & Implant Science Vol.28 No.2
The periodontal health has been evaluated clinically by various epidemiological indices, and in researches by measurement of gingival crevicular fluid. Laser Doppler flowmetry is a reliable and objective method that allows immediate measurement of erythrocyte flux in approximately one cubic mm of the capillary bed without disturbing the tissues. The purpose of the present study was to determine whether human gingival blood flow was different according to measuring area, measuring time, and sex or not. Forty volunteers with good general and periodontal health, aged early twenties and unmarried, were selected. Laser Doppler flowmetry($floLAB^{(R)}$, Moor Instruments Ltd., England) was applied to measure the gingival blood flow of marginal gingiva, interdental papilla, attached gingiva and alveolar mucosa. The blood flow of interdental papilla was measured at 9-10 AM, 1-2 PM, and 5-6 PM. The difference of blood flow according to measuring area and measuring time was statistically analyzed by one way AOVA and Dunkan test, and the difference of blood flow between men and women was statistically analyzed by t-test. (1) Mean blood flow was significantly higher in alveolar mucosa than in the gingiva(p<0.05), and there was no significant difference in blood flow between marginal gingiva and interdental papilla(p>0.1). (2) Mean blood flow was significantly higher at 5-6 PM than at 9-10 AM and 1-2 PM(p<0.05). But there was no significant difference in gingival blood flow between 9-10 AM and 1-2 PM(p>0.1). (3) There was no significant difference in gingival blood flow between men and women(p>0.1). The above results suggest that the measurment of gingival blood flow using laser Doppler flowmetry may be clinically applicable to early determination of gingival inflammation and evaluation of healing status, but further studies are necessary to standardize and simplify the measuring procedure.
김형수,박세혁,조병문,오세문,Kim, Hyung Soo,Park, Se-Hyuck,Cho, Byung Moon,Oh, Sae-Moon 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.12
Objective : The purposes of this study are to compare imaging features with operative findings and to determine significance of imaging studies for early detection of craniosynostosis(CS). Methods : Plain radiograph of skull and three-dimensional(3D) CT reconstruction were analyzed in 10 consecutive patients with CS to assess the presence and the extent of synostosis. The radiological findings were investigated and compared with operative findings. Results : The locations of lesion were coronal suture in 6, sagittal suture in 3 and multiple sutures in one patient, and the age ranged 1 to 53 months(mean age : 17.4 months). Reconstructive procedures with or without advancement of supraorbital rim were performed in coronal CS patients and ${\pi}$-procedures or synostectomy were done in sagittal CS patients. Radi-ological abnormalities such as sutural indistinctness or sclerosis, bony ridge, bossing and other bony deformities were nearly consistent with surgical findings. Conclusion : The interpretation of imaging study are very important for early detection of craniosynostosis, especially, the plain radiographs of skull. Also 3D CT imaging is helpful in diagnosis and surgical planing of craniosynostosis. There are no significant differences between imaging features and operative findings in CS patients.
선천성 거대결장증 수술 후 문합부에 발생한 점액성 대장선암: 증례 보고
김형수,윤권하,Kim, Hyung-Soo,Yoon, Kwon-Ha 대한영상의학회 2004 대한영상의학회지 Vol.50 No.1
선천성 거대결장증으로 수술한 후의 장기 추적에서 문합부에 악성종양이 생긴 경우는 보고된 바가 없다. 저자들은 선천성 거대결장증으로 26년전에 Soave 수술을 받은 환자의 문합부에생긴 점액성 대장선암를 경험하였기에 이를 보고하는 바이다. To our knowledge, rectal cancer arising at the anastomotic site after surgery for Hirschsprung's disease has not been reported. We report a case of mucinous adenocarcinoma arising at the anastomotic site after Soave operation 26 years ago.
H2Ti4O9nH2O로부터 Na+ / H+ 의 이온교환에 의한 NaxTinO2n+1 whisker 의 합성과 치환량에 따른 열적거동 및 상전이
김형수,이진식,송연호,이철태 ( Hyung Soo Kim,Jin Sik Lee,Yon Ho Sang,Chul Tae Lee ) 한국공업화학회 1997 응용화학 Vol.1 No.1
Na_xTi_nO_(2n+1) Whisker was prepared by Na^+/H^+ ion-exchange on layered hydrous titanium dioxide, H₂Ti₄O_9·nH₂O. The ion-exchange reaction proceeded at various mole concentration of NaOH solution that the host framework of [Ti₄O_9^(2-)]_n was remained unchanged. And the ion-exchange phase identified the phase transition through the heat treatment at various temperature. As the result of this experiment, NaHTi₄O_9·nH₂O was decomposed into Na₂Ti_6O_13 and TiO₂ in the temperature of 200℃∼600℃.
소뇌 혈관아세포종 전적출 후 천막상에 발생한 혈관아세포종 - 증 례 보 고 -
김형수,박세혁,조병문,김덕환,오세문,Kim, Hyung Soo,Park, Se-Hyuck,Cho, Byung Moon,Kim, Duck-Hwan,Oh, Sae-Moon 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.2
Hemangioblastoma is a benign tumor of vascular origin that develops usually in the posterior cranial fossa. We report a case of supratentorial leptomeningeal hemangioblastoma occurring in a 45-year-old man who received total removal of recurrent cerebellar hemangioblastoma four years ago. He was admitted for the evaluation of severe headache and magnetic resonance image showed a well-enhanced, extra-axial mass in the right parietal region. A presumptive diagnosis was meningioma. It was completely removed with the attached dura. Histological examination including immunohistochemical study showed typical findings of hemangioblastoma. It is emphasized that close observation may be necessary for hemangioblastoma, even after total removal.