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연소합성법에 의한 Plasma-arc Deposit 용 $Cr_3C_2$ 합성 및 특성에 관한 연구
장윤식,윤정아,이윤복,박성수,김인술,박흥채,오기동 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.11
Using Cr2O3 Al and graphite powders as starting materials Cr3C2 was synthesized by combustion synthesis process according to the following reaction : 3Cr3C2 +4C+6Allongrightarrow2Cr3C2 +3Al2O3. The synthesis was conducted at 2 atm in an argon atmosphere. in this study main-product was monolithic phase of Cr3C2 /Cr7C3 mixture and sub-product was slag state of $\alpha$-Al2O3. Single phase of Cr3C2 was obtained when crushed main-product was heat-treated at 120$0^{\circ}C$ for 3h in vacuum state with addition of 2.5wt% C. The obtained Cr3C2 powder can be used as plasma-arc deposit material because the flowability index of powder with the size of 9-50${\mu}{\textrm}{m}$ was 66.
연소합성법에 의한 $MoSi_2-Al_2O_3$ 복합재료의 특성에 미치는 $Mo/MoO_3$ 몰비의 영향
장윤식,이윤복,김용백,김인술,박흥채,오기동 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.11
MoSi2-Al2O3 composites were prepared by thermal explosion mode of self-propagating high temperature syn-thesis (SHS) using element powders of MoO3 Mo Si and Al. The combustion products of MoSi2 which have 10, 20, 30 and 40 wt% Al2O3 showed the molten state in the range of Mo to MoO3 6:1-9.5:1, 2:1-8:1, 1:1-5:1, and 1:1-3:1 (molar ratio) respectively. The combustion products which made least seperation the molten phase from the slag phase were in Mo/MoO3=9, 5:1, 8:1, 5:1 and 3:1 (molar ratio) respectively. Particles size of MoSi2 and Al2O3 in the combustion product were decreased as the molar ratio of Mo to MoO3 increase. By XRD analysis only MoSi2 and $\alpha$-Al2O3 peaks were identified in the combusion products, In case of MoSi2 containing 20wt% Al2O3 5.1wt% Al existed into MoSi2 grains and 30.7wt% Si and 7.7wt% Mo existed into Al2O3 grains. The relative density of MoSi2 containing 10, 20, 30 and 40 wt% Al2O3 were 82.7, 85.2, and 81.9% respectively. The fracture strength of MoSi2-Al2O3 composites increased with increasing Al2O3 and that of MoSi2-20wt% Al2O3 composite was 195 MPa.
장윤식 이실학회(구 한국경찰이론과실무학회) 2012 경찰연구논집 Vol.9 No.-
법과학은 다양한 증거를 분석하고 여러 과학 기술을 응용할 필요가 있는 무작위적이고 조직화되지 않은 ``범죄``의 특성에 덧붙여 그 결과가 통상의 과학과정의 추론과다른 복합적 규칙을 지닌 법적 영역에서 표현되어야 하는 특별한 분야이다. 대학에서 의 법과학 교육은 전문지식의 습득과 실무기관의 훈련 부담의 절감, 연구를 통한 기여 등 여러 측면에서 확대가 될 필요가 있다. 하지만 과학 교육이 조금씩 확대되어가는 국내 사정과 달리 여러 선진국은 교육의 과잉으로 인한 문제를 겪고 있다. 이에 는 취업문제, 교육 품질 문제, 교육의 내용과 훈련 등 다른 전문성 요소와의 관계 등이 포함된다. 이에 본고에서는 주로 미국과 영국을 중심으로 법과학 교육과 관련하여인지된 문제와 이를 해결하기 위한 노력들을 살펴보고 국내 법과학 교육발전에 시사하는 바를 모색해보고자 하였다. 국내 법과학 전문인력의 수요는 크지만 이는 조직과 예산상의 문제일 따름이며, 실제 국립과학수사연구원 등 소수 기관에 집중된 신임 연구원 수급은 법과학 교육에 의존하지 않고 있어 무엇보다 법과학 교육의 활성화를 가로막는 요인은 취업 문제라고 할 수 있다. 특화된 법과학 교육에 대한 인식제고와 함께 실제 교육이 진행될 때에도 교육 품질의 인증과 국가적인 진로모델의 마련을 통한 전문성 개발의 효율화를 도모할 필요가 있으나 법과학 실무가 관련 기관별로 이루어져 이러한 기틀을 마련할법과학 거버넌스가 뚜렷하지 않다는 것이 범국가적인 제도마련의 장애요소라고 할수 있다. Forensic sciences are specialized area due to the random and unorganized nature of crimes requiring diverse evidence analysis and application of various sciences and technologies, and the result should be demonstrated in legal context requiring complicated rules, unlike ordinary scientific inferring process. In Korea, forensic education is needed to expanded regarding such aspects as acquisition of more specialized knowledge, reduction of training costs of current laboratories, and other contributions of academia including researches. In contrast, excessive amount of forensic education came into question in some countries. Difficulty in seeking a job, quality of education, and harmonization with other factors of expertise are recognized problems. This paper explores implication from the recognized issues and countermeasures mostly in the U.S. and the U.K. Needs for new recruitment in Korean forensic laboratories are increasing. It does not directly imply that more forensic education is required. Because the laboratories do not rely on forensic education to hire new employees, it is one of the most distinctive causes of inactive forensic education. Other than awareness for forensic education, such resolutions as accreditation of forensic courses for the better quality education and suggestion of career path for forensic practitioners for the better efficiency should be pursued by a forensic governance. Korean forensic governance seems not even formulated because laboratories belong to separate organizations have their own approaches for management including development of expertise.
만성신부전 환자에서 발생한 기무라씨 질환에 의한 급성신부전 1예
장윤식,김창환,안석주,방병기,박철휘,장데레사 대한신장학회 1998 Kidney Research and Clinical Practice Vol.17 No.6
Kimura's disease is a granulomatous disease which develops in the skin, subcutaneous tissues and lymph nodes and is characterized histologically by the presence of lymphoid follicles, vascular proliferation and infiltration with eosinophils. The disease shows geographical predilection to Japan, China and South East Asia. The exact etiology and pathogenesis remain uncertain. Some patients had proteinuria or nephrotic syndrome. We have recently experienced the superimposed oliguric acute renal failure associated with Kimura's disease in a male patient with chronic renal failure who had been managed conservatively. Inguinal lymph node biopsy revealed Kimura's disease. He recovered from acute renal failure after being treated with hemodialysis and prednisolone. Lymphadenopathy and fever subsided with steroid treatment. We report a case of Kimura's disease which was comp- licated by acute renal failure in the patient with chronic renal failure.