SHS 화학로에 의한 TiC-B₄C 복합체의 소결특성에 관한 연구

이형복,이재원,박성 明知大學校 産業技術硏究所 1993 産業技術硏究所論文集 Vol.12 No.-

SHS 법에 의하여 TiC를 합성하고 SHS 화학로를 이용하여 B₄C를 합성하여 TiC 기지에 B₄C의 첨가량을 변화시키면서 TiC-B₄C 복합체의 소결특성을 연구하였다. TiC-B₄C 복합체에서 20wt% B₄C를 첨가하였을때 가장 우수한 소결특성을 나타내었으며 1900℃에서 90분간 30MPa의압력으로 고온 가압소결하여 얻어진 소결체의 상대밀도, 꺽임강도, 경도 및 파괴인성은 각각 98.2%, 620MPa, 2412Kg/mm²그리고 ??이었다. TiC and B₄C were prepared from the Mixture of metal titanium, boron and graphite powders in Argon atmosphere by Self-propagating High-temterature Synthesis method and self-propagating High-temterature Synthesis Chemical furnace respectively. The sintered properties of TiC-B₄C composite as a function of B₄C content was investigated in theTiC-B₄C composite. The relative density. M. O. R. strength, Hardness and fractur toughness of TiC-20wt% B₄C composite sintered at 1900˚C for 90min. by hot-pressing under the presure of 30 MPa were 98.2%, 620MPa, 2412kg/mm and ??,respectively.

달리기 운동 프로그램이 시각장애인의 건강관련 체력에 미치는 영향

이명수,양점홍,홍순미,최재현,박원익,이창준 釜山大學校 附設 體育科學硏究所 2004 體育科學硏究所 論文集 Vol.20 No.-

The purpose of this study was to find out the effect of jogging(LSD ; Long Slow Distance) and walking training on health-related fitness of the blind.....

단면의 성질을 적용한 크기와 회전 변화에 불변인 영상 검사 시스템

이용중,김태원,김기대,류재엽 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-

The purpose of this paper is to develop image inspection system endows an automatic operating and measuring that the moment values are invariant with respect to variable object size and rotation. In this paper, using these moment feature vector with Hu's 7 invariant moment is also given. The charasteristics of section which is applied in the mechanics used moment descriptor of invariant moment detection algorithm for image inspection system. Corresponding rates between 94% and 96% have been achived for all object tested.

ESO 기법을 이용한 컴플라이언트 메커니즘 설계

이원구,박재용,김상락,유진식,한석영 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

A compliant mechanism is a mechanism that produces its motion by the flexibility of some or all of its members when the input forces are applied. Whereas the topology optimization based on homogenization and SIMP parameterization has been successfully applied for compliant mechanism design, an ESO approach has not been considered yet for the optimization of these types of systems. This work presents a modified version of the evolutionary structural optimization (ESO) Procedure for its application in topology optimization of compliant mechanisms, It will be shown that an additive version of this method must be adopted in order to achieve the optimum design, since the traditional ESO method's element removal technique is not efficient in this case. The methodology is based on a mutual energy concept for formulation of flexibility and the ESO method. A multi-objective optimization problem is formulated as an application of compliant mechanism design. The procedure has tested in several numerical applications and benchmark examples to illustrate and validate the approach.

SHS법에 의한 Tic-MoB 복합체의 소결특성에 관한 연구

이형복,이재원 명지대학교 자연과학연구소 1994 자연과학논문집 Vol.11 No.-

SHS법에 의하여 TiC를 합성하고 SHS 화학로를 이용하여 MoB를 합성하여 TiC 기지에 MoB의 첨가량을 변화시키면서 TiC-MoB복합제의 소결특성을 연구하였다. TiC-MoB 복합체에서 20-30%MoB를 첨가하였을때 가장 우수한 소결특성을 나타내었으며, 2000℃에서 30분간 30MPad의 압력으로 고온 가압소결 하여 얻어진 소결체의 밀도, 꺽임강도 및 경도는 각각 98.0%,670MPa 그리고 4.730kg/㎟이었다. TiC and MoB were prepared from the mixture of metal titamium, boron and graphite powders in argon atmosphere by Self-propagating High-temperature Synthesis method and Self -propagating High-temperature Synthesis Chemical Furnace respectively. The sintered properties of TiC-MoB composite was investigated as a function of MoB content. The best value of density, bending strength and hardness of Tic-MoB composite sintered at 2000oC for 30min, under the presure of 30MPa by hot-pressing were 98.0%, 670MPa and 4730kg/mm?, repectively.

냉각탑용 프로펠러 팬의 설계

김재원,이정민 선문대학교 중소기업기술지원연구소 2001 선문공대 연구/기술 논문집 Vol.6 No.1

냉각탑에 쓰이는 프로펠러 팬의 설계와 개발은 선행 수치해석과 풍동에 의한 실험적 확인으로 이루어졌다. 팬의 날개 형상에서 가장 중요한 것은 공기 역학적 현상의 최적 설계이다. 본 연구에서의 수치해석 방법은 FINE/TURBO라는 상용 프로그램을 이용하여 날개 근처의 자세한 유선과 유량 등의 공학적 자료를 얻었다. 전산 해석 연구에서 얻어진 수치 해석의 결과는 풍동을 이용한 실험 결과와의 비교에서 우수한 정확도를 보여 주었다. 또한, 새로이 제안한 날개의 수치 해석결과 현재 시장에서 판매하고 있는 모델보다 상대적으로 우수한 결과가 도출되었다. Design and developments of a propeller fan for a cooling tower have been accomplished by both numerical prediction of performance and experimental validation with a wind tunnel. Main interest lies on blade geometry of a fan for optimal design of aerodynamic performance. A commercial program, Fine/Turbo used for the present numerical estimation, which gives us engineering information such as flow details near the blades and flow rate of the system. The numerical results are compared with experimental output and show good agreement in comparison between the two data. Also, new proposed model of a blade show improved performance relative to present model in the market.

저작근 골막하 박리를 이용한 만성 재발성 탈구의 치험례

심재환,김기홍,문진석,민병진,이원학,홍광진 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.3

Chronic recurrent dislocation(CRD) of the jaw has various etilogical causes, including trauma, congenital or acquired neurological illness, ingestion of certain medicines, incorrdination of the neuromuscular astivity of the chewing muscles, articular anatomical alteration, etc. Various surgical methods have been advocated for the treatment of the CRD. They may be divided into two groups: procedures designed to limit translation of the condyle and procedures eliminating obstacles in the condylar path. Hypomobility of mandible can be developed after BSSRO and it is probably caused by scar contracture, atrophy, and myofibrosis. Many authors, therefore, emphasized the importance of physical therapy especially after BSSRO to prevent the complication. Based on that idea, we designed more conservative surgical method to limit mandibular openning compared the methods that previously introduced and tried to treat the CRD. This new method consists of extensive subperiosteal dissection of masseter and the temporalis muscle under local anesthesia and use of intermaxillary elastics for some periods.

사람 태아간의 산호성 과립백혈구형성에서 산호성 과립형성에 대한 미세구조 연구

송재섭,김경용,이원복,김동창 중앙대학교 의과대학 의과학연구소 1992 中央醫大誌 Vol.17 No.4

The developmental processes of eosinophilic granule formation were ultrastructural investigation of eosinophilic granulopoiesis in 15 cases of human fetal livers from 8 to 34 weeks of gestation. 1) Numerous vesicles, microgranules and small agranular and granular vacuoles were distributed around the distended Golgi apparatus in myeloblast and eosinophilic promyelocyte. 2) Granular matrix of vacuoles contained small granular vacuoles, serveral vesicles and mutilamellar structures. The granular substance exhibited higher electron density than that of cystic rough endoplasmic reticulum(RER) and was similar partly to that of immature eosinophilic granules. 3) Distended cystic RER was fused to produce matrix of maturing granules with granular vacuoles and immature eosinophilic granules. 4) Immature eosinophilic granule which began to be produced in eosinophilic promyelocyte, had myelin sheath-like structure and debris of vesicles and granular vacuoles and those disappeared immediately. The charicteristic crystalloid inclusions began to develop in immature eosinophilic granule of myelocyte. In summary, it is suggested that vesicles and granular vacuoles as well as RER in the myelocyte and promyelcyte are participating in the formation of immature eosinophilic granules which become mature with the appearance of charicteristic crystalloid inclusion

선천성 완전방실차단이 동반된 신생아 루프스 1예

정재현,이은지,이은주,황진원,송영진,최병진,김일환,김종윤,허민영,김동욱 인제대학교 2009 仁濟醫學 Vol.30 No.-

Neonatal lupus is a rare syndrome occurring In neonates with tranplacentally acquired maternal autoantibodies, In particular anti-SSA/Ro-SSB/Ra antibodies. Manifestations include congenital heart block, cutaneous lesions, thrombocytopenia, neutropenia, pulmonary or neurological disease and hepatitis. The non-cardiac manifestations resolve by 6 months of age, congenital heart block is irreversible. We experienced a case of neonatal lupus with congenital complete heart block in a newborn of asyptomatic mother with anti-SSA/Ro-SSB/Ra antibodies.

급성 골수성 백혈병 환자에서 관해 유도 항암 화학요법 후 발생한 베르니케 뇌증

황진원,정재현,서광원,최병진,송영진,김종윤,이은지,임홍규,이상민 인제대학교 2009 仁濟醫學 Vol.30 No.-

Wernicke's encephalopathy is characterized by the triad of ocular symptoms, ataxia, and mental confusion and neuropsychiatric condition generally caused by acute thiamine deficiency. Although it is common in the severe alcoholics, several other causes also have been identified, such as total parenteral nutrition (TPN) use, hyperemesis gravidarum, anorexia nervosa, hemodialysis, uremia, and acquired immunodeficiency syndrome(AIDS). Chemotherapy in patient with malignanacy and long term total parenteral nutrition following bone marrow transplantation are related with Wernicke's encephalopathy. A 48-year-old woman had been treated with Daunorubicin and Cytarabine for remission induction chemotherapy of acute myeloblastic leukemia and intravenous hyperalimentation due to persistent hematochezia and ileus caused by infiltration of leukemic cell in terminal ileum. She suddenly complained of diplopia, tremor, and mental confusion at 32th day after chemotherapy and generalized tonic-clonic seizure at 34th day after chemotherapy. The diagnosis of Wernicke's encephalopathy was made with clinical presentations and brain MRI. Brain MR T2-weighted & Flair image revealed a high signal intensity lesions bilaterally at the medial thalamus and peri-acueductal grey matter of the midbrain. The patient was successfully treated with vitamin B1. We presented a case of acute Wernicke's encephalopathy developed after remission induction chemotherapy followed by intravenous hyperalirnentation in a patient with acute myeloblastic leukemia.