Fe-Cu-As 3원계의 비소 활량에 관해서

黃龍吉,姜憲贊 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2

Fundamental studies of the behaviour of arsenic in copper smelting as well as the phase relations and arsenic activity in liquid Fe-Cu-As systems were undertaken. The arsenic activity in the liquid Fe-As stystems, Cu-As systems and Fe-Cu-As systems was determined at 1150℃ by the use of an isopiestic method. 1. The value of arsenic activity coefficient, γ°_(As)(1), was calculated to be 2×10^(-3) from the experimetal data by the solute arsenic at infinite dilution in Fe-As system at 1150℃. 2. In the genral case of arsenic has a greater affinity for Fe-As systems than for Cu-As systems. 3. The arsenic activity of Fe-Cu-As systems increases drastically in the high concentration range. 4. The liquidus and Solidus lines divide the equilbrium diagram into Fe-Cu-As system at 1150℃.

製鋼粉塵과 産業廢棄物의 處理

黃龍吉,李相和,姜憲贊 동아대학교 공과대학 부설 한국자원개발연구소 1982 硏究報告 Vol.6 No.1

The aim of this study is to make use of waste materials as material resources by treating dust with environmental problems and gum-type waste materials produced as steel-making plants and to get rid of environmental pollution. The results obtained from experiment are summarlized as follows; 1) After the distillation of gum-type waste materials at a temperature above 400℃, the amount of residual distilled carbon has been found to be about 33% and the rest of distilled sample, i. e. 67%, has been evaporated. About 20% of the evaporated sample has been condensed as liquid and about 47% of it collected as gas. This product of both liquid and gas has proved to be usable as fuel. 2) As a result of using distilled carbon obtained by distilling waste gum as reducing agent the effect similar to the case where anthracite may be used as reducing agent has been obtained, i. e. more than 90% of reduction volate rate is shown after reducing for one hour at 1100℃. 3) Zinc oxides obtained by reducing and reoxdizing dust produced during steel-making process have been found to be zinc compound with Zinc of more than 53%. X-ray diffraction analysis has shown that zinc compound can’t be determined and that lead consists of basic lead sulphate salt(Pb₄O₃SO₄·2H₂O). Scanning electron micrograph has, however, revealed a sigle crystal of metallic zinc. 4) This experiment reports that since gum waste can be utilized as a reducing agent of dust produced during steel making process by using distilled carbon obtained by retreating with evaporated waste-material as fuel, if acts as a fuel saver as well as a material which can solve one of environmental problems.

17Cr Stainless鋼의 介在物分布에 관한 硏究

黃龍吉,成章鉉,閔庚和 東亞大學校 大學院 1978 大學院論文集 Vol.2 No.-

To study the distribution, contents and structure of inclusion in 17Cr stainless steel, the samples were obtained with elapes time and Fe-Si addition after melted down in the high frequence induction furnace. And the distribution of inclusions, inclusion contents and the structure of inclusions were studied by means of optical microscopy, Br-Methanol method and X-ray technique. From the above experiments, the following conclusions could be summerized. 1) The inclusions of holding samples after melted down were spheroidal shape. And with the increase of holding time, the inclusion contents increased from 0.073% to 0.125%. And the distribution of fine inclusions decreased and the coarse inclusions increased from 2.0-3.ou:76% to 2.0-3.0:40%. 2) The inclusions of Fe-Si treated sample were dispersed and granular type. And the inclusion contents were increased compared with the holding samples after melted down. And the inclusions were distributed to fine one. 3) The inclusions were composed of Fe3O4, Cr2O3 and amorphous compound of Ni,Mo, Mn etc.

水熱處理 및 하소에 의한 燐酸니켈 顔科特性의 改善

黃龍吉,薛秀德 동아대학교 공과대학 부설 한국자원개발연구소 1979 硏究報告 Vol.4 No.1

黃色 燐酸니켈((α-Ni₂P₂O_(7))의 特性改善을 目的으로 이것의 水熱處理 效果를 檢討하였다. 燐酸니켈을 加數分解法에 의해 黃酸니켈 및 炭酸니켈에 燐酸암모늄을 添加시켜 混合시킨 뒤 稀燐酸水溶液 중에 分散시켜 100℃, 5시간 水熱處理해서 얻어진 試料를 900℃,3시간가량 하燒시킨 결과 90% 이상의 α-Ni₂P₂O_(7)을 含有한 鮮明한 黃色의 加熱生成物이 얻어졌다. Yellow nickel phosphate (α-Ni₂P₂O_(7)) was synthesized by the seed method and the autoclaved it in H₃PO₄ solution at 100℃ for 5 hours. When hydrolyzed sample was calcined with temperature range 600℃ for 3 hours, 90% and over calcined material was recovered in the form of α-Ni₂P₂O_(7) with a yellow colour.

합성 Zinc Ferrite 에 관한 연구

오이식,황룡길 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.11

To determine the mechanism by which zinc ferrite forms when ferrous zinc sulphide ore is roasted, the experiment has been carried out under given conditions by sufficiently mixing zinc oxide with ferric oxide in a stoichiometric way. The results obtained from this experiment are summarized as follows: 1) Formation of zinc ferrite was confirmed by x-ray diffraction analysis in formed compound at alternation of various mole ratio and temperatures. 2) Zinc ferrite was obtained by stoichiometric ratio without any effect of mixed mole ratio i.e., zinc ferrite was not confirmed at temperature less than 700℃, but was found at above 700℃. 3) Zinc leaching rate of synthetic zinc ferrite on sulphuric acid solution or ammonium salt solution was similar at low temperatures (below 680℃), but decreased at above 700℃. For ammonium salt solution (ZnO: Fe₂O₃=1 : 1), the zinc leaching rate was found to be 9.07% at 1000℃ and 49.97% at 700℃, respectively. This zinc leaching rate for sulphuric solid solution (ZnO: Fe₂O₃=1 : 1), however, showed 25.03% at 1000℃ and 95.79% at a temperature 700℃. Therefore, zinc leaching rate of zinc ferrite on sulphuric acid solution was found to be more than twice as much as for ammonium salt solution. 4) Zinc ferrite was found to from at 1000℃ even under conditions of changing mole ratio. For ZnO: Fe₂O₃= 1:1, however, the formation of zinc ferrite only was confirmed. When values of the ratio of ZnO to Fe₂O₃were 1 to 1 and 5 to 1, both zinc ferrite and free zinc oxide were obtained, where when its value was 1 to 2 the formation of zinc ferrite and free Fe₂O₃was determined.

탄소강선의 강종별 고주파소입조직 (高周波燒入組織) 에 대한 연구

오응환,황룡길 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.4

The microstructures and austenite grain sizes of carbon steel wires treated by high frequency induction heating and quenching were studied. Effects of alloying elements Ti, B added to a carbon steel wire were also discussed. A lot of untransformed ferrites were found in the center of the specimen of low carbon steel: but the volume of those decreased as carbon content was increased under the same test heating temperatures. In regard to Ti and B of alloying elements, Ti showed a significant effect on depressing the austenite grain growth and B tended to increase hardenability.

고지대 폐부종으로 간과되어 농흉으로 진행한 폐렴 1예

최선규,구철,지황룡,조경욱,정종길,정재성,이창진,박승욱,박진우 대한내과학회 2009 대한내과학회 추계학술대회 Vol.2009 No.-

포스터 전시 발표 순서 : 호흡기 ; 고지대 폐부종으로 간과되어 농흉으로 진행한 폐렴 1예 (초)

최선규,구철,지황룡,조경욱,정종길,정재성,이창진,박승욱,박진우 대한내과학회 2009 대한내과학회지 Vol.77 No.4S

복강 내 농양으로 발현한 폐흡충증 이소기생

구요한,안성,하상윤,지황룡,조대호,정종길 조선대학교 의학연구소 2014 The Medical Journal of Chosun University Vol.39 No.1

Paragonimiasis is an infectious disease caused by ingestion of freshwater crab, crayfish, or shrimp infested with Paragonimus metacercariae. Here, we report a case of extrapulmonary paragonimiasis presenting as an abscess in the abdominal cavity. A 54 year old woman presneted, compaining of severe abdominal pain. Her abdominal CT showed an abdominal abscess with peripheral rim enhancement and central hypodensity core on omentum and terminal ileum. We decided to perfom a diagnostic laparoscopic exploration for acute abdominal pain. During surgery, we saw a living adult worm in the abscess pocket. We diagnosed paragonimiasis and treated with Praziquantel. This case was confirmed by biopsy and micro-ELISA test.

S-492 : 쉬겔라 및 람블편모충의 중복감염 1예

안성,구요한,구철,지황룡,정종길 대한내과학회 2013 대한내과학회 추계학술대회 Vol.2013 No.1

서론: 우리나라의 해외여행은 매년 꾸준히 증가하고 있는 추세이다. 해외여행 중에 많은 여행자들이 해당 지역의 풍토병에 노출될 수 있으며, 여행 중 가장 흔하게 발생할 수 있는 감염병인 위장관 감염 또한 증가 추세에 있다. 대게 해외여행 중에 발생하는 위장관 감염은 박테리아나 바이러스, 기생충 감염 등이며, 대부분 단독 감염에 의한 경우가 많다. 그런데 본 증례에서는 드물게 해외여행 후에 박테리아 감염인 쉬겔라 감염과 함께, 기생충 감염인 람블편모충 감염의 중복감염이 발생하여 보고하고자 한다. 증례: 22세 남자 환자로 인도 지역을 여행중 맥그로드 간지 지방에서 뗌뚝이라는 음식을 먹고난 이후, 처음에는 발한, 구토, 식욕 부진, 복통이 있더니 열이 떨어지면서 수양성 설사가 지속되었다. 내원 당시에는 환자 증상으로 복통, 식욕부진, 설사가 지속되었으나 고열은 없는 상태였다. 환자 과거력 및 가족력에 특이 소견 없었으며, 혈액검사에서 경도의 백혈구 수치 상승 외에 방사선학적검사, 활력징후상 특이 소견 보이지 않았다. 입원 후에 경험적 항생제로 ciprofloxacin 정주 및 보존적 치료하였고, 입원 당시 시행한 대변 배양검사에서 ciprofloxcin 내성을 보인 S. sonnei 동정되었다. 또한, 대변도말검사에서 람블편모충의 영양형이 관찰되어 람블편모충 중복감염을 진단하였다. 이에 경험적 항생제로 사용하고 있던 ciprofloxacin을 중단하고 S. Sonnei감염 관련 항생제 내성 검사에서 감수성을 보인 trimethoprim-sulfamethoxazol 및 람블편모충 감염에 대한 치료로 경구 metronidazole 추가 투여하였다. 환자 복통 및 설사 등의 임상 증상은 병용투여 시작 후 호전양상 보였다. 2주간 항생제 및 보존적 치료 후에 환자 증상 소실 및 더 이상의 대변배양검사 및 대변도말검사 등에서 쉬겔라 동정 안되면서 람블편모충의 영향형 관찰되지 않아 항생제 중단 후에 퇴원 하였고 1주일 후 외래 내원시 특별히 호소하는 증상 없었으며, 혈액검사상 특이 소견 보이지 않았다.