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Cone-beam CT로부터 제작된 측모 두부계측방사선사진의 정확도 평가
강지영,임성훈,김광원 대한치과교정학회 2007 대한치과교정학회지 Vol.37 No.6
최근 computed tomography (CT) 데이터로부터 실제 두부계측방사선사진 촬영기에서 촬영한 사진과 동일한 확대율을 갖는 두부계측방사선사진을 형성할 수 있는 기능을 갖춘 소프트웨어 (Accurex, CyberMed, Seoul, Korea)가 소개되었다. 이에 본 연구에서는 cone-beam CT (이하 CBCT) 데이터로부터 이 소프트웨어를 이용하여 제작된 측모두부계측방사선사진과 기존의 두부계측방사선사진촬영기로 촬영된 측모 두부계측방사선사진에서 각각 두부계측방사선사진 분석을 시행하여 그 차이를 비교함으로써 소프트웨어를 통해 CBCT로부터 제작된 측모 두부계측방사선사진의 활용 가능성을 평가하고자 하였다. 20명의 교정 환자를 대상으로 CBCT와 측모 두부계측방사선사진을 동시에 촬영하였다. CBCT로부터 제작된 측모 두부계측방사선사진과 기존 방식의 측모 두부계측방사선사진에서 두부계측방사선사진 분석을 시행한 후 두 사진의 계측치의 차이를 paired t-test로 검정하였다. 23개의 계측치들 중, 20개 항목에서는 통계학적으로 유의한 차이가 관찰되지 않았으나, U1-FH, Mx6 to PTV, Maxillomandibular difference의 항목에서는 유의한 차이가 나타났다. 이러한 차이는 CBCT로부터 형성된 측모 두부계측방사선사진의 해상도가 낮아 일부 해부학적 지표를 확인하기 어렵기 때문이며, 임상에서 CBCT로부터 제작된 측모 두부계측방사선사진을 porion, PTV, condylion과 같은 일부 해부학적 지표를 이용하지 않는 SNA, SNB, U1 to SN, IMPA, interincisal angle 등 흔히 사용되는 간단한 측모 두부계측방사선사진 계측에 활용 가능할 것이다. Objective: Three-dimensional approaches for the diagnosis and analysis of the dentofacial area are becoming more popular in accordance with the development of cone-beam CT (CBCT). The purposes of this study were to evaluate the reliability of cephalometric measurements of lateral cephalograms generated from a CBCT image by making comparisons with the traditional digital lateral cephalogram, and to evaluate the possibility of the clinical application of CBCT generated cephalogram images. Methods: Twenty patients whose external auditory meatus could be identified in the CBCT image were selected, and both CBCT and digital cephalograms were taken. Differences between the measurements of both cephalograms were tested by paired t-test. Results: Among the 22 measurements used, only U1-FH, Mx6 to PTV, and maxillomandibular difference showed statistically significant differences between the CBCT generated cephalogram and the digital cephalogram. Conclusions: The results suggest that the CBCT generated cephalogram can be used for some cephalometric measurements not requiring porion, PTV, condylion as a landmark (SNA, SNB, U1 to SN, IMPA, interincisal angle, etc.).
강지훈,홍기형,이성인 충남대학교 기초과학연구소 1994 忠南科學硏究誌 Vol.21 No.1
We study knowledge-based systems for diagnosing faults in switching systems. We survey many knowledge-based systems for telecommunications. Especially, we analyz the ACE expert system developed by the Bell Laboratory of AT&T, which is the first expert system in the telecommunication area. Its motivation, development and configuration are examined thoroughly. From this survey, we propose an architecture for a knowledge-based system based on deductive database technologies for telecommunication areas.
표면근전도와 전자각도기를 이용한 자동차 부품 조립작업 위험요인 평가
강동묵,이철호,,신용철,김은아,우지훈,조병만,이수일 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4
Objectives: As automobile part manufacturing is characterized by high speed and high repetition, observation methods which are usually utilized for static posture are inappropriate to evaluate musculoskeleatal risk factors. This study quantified the risk factors of musculoskeletal disorders on the forearm and suggested exposure limits by estimating the risk factors using surface electromyography (EMG) and electrogoniometer. Methods: Ten percent of the total workers at 3 automobile part manufacturing factories were randomly selected, and 99 male workers were recruited as study subjects. The study was conducted during May 2003 to September 2004. The workers were equipped with electrogoniometers on the wrist and the elbow, surface EMGs on the skin of the flexor digitorum superficialis (FDS) and extensor carpi radialis (ECR) muscles, and the heart beat recorder during work as indicators of joint movement, local muscle tension and physical work load, respectively. Results: After controlling for age, body mass index and job stress, wrist flexion maximum angle, FDS relative activity (RA) and ECR RA were significantly associated with forearm musculoskeletal symptoms. The odds ratios of the forearm were 5.0(95% CI: 1.1-22.7), 14.0(95% CI: 1.5-128.8) and 7.3(95% CI: 1.1-49.4) for wrist flexion maximum angle more than 76˚, FDS RA more than 2.8%, and ECR RA more than 3.5%, respectively. Conclusions: Joint angle and focal muscle activity were associated with forearm musculoskeletal symptoms. To reduce forearm musculoskeletal symptoms among automobile part manufacturers, the wrist flexion angle, and FDS and ECR activity need to be reduced below the guidelines recommended in this study.
강미선;박상훈;박지영 서희영;허란;김상현 인제대학교 백병원 2011 仁濟醫學 Vol.32 No.-
Acute fatty liver of pregnancy (AFLP) was first described as a specific clinical entity in 1940 and thought to be universally fatal. Maternal mortality in the past approached 75 percent. However early diagnosis and prompt delivery have dramatically improved the prognosis, and maternal mortality rate is now less than 18 percent. A early diagnosis, a prompt delivery, and a intensive supportive care have improved maternal and perinatal outcome. We report a 30—year—old woman at 37 weeks gestation who have multiple complications including acute pancreatitis in AFLP. She was complicated with acute renal failure, disseminated intravascular coagulation, duodenal ulcer bleeding, spontaneous bacterial peritonitis, pulmonary edema and acute pancreatitis.
강지훈 충남대학교 자연과학연구소 1992 忠南科學硏究誌 Vol.19 No.2
Three deductive rule rewriting techniques, EDNF, UJNF, and Magic Set Method, are considered. EDNF and UJNF are algebraic rewriting techniques, but Magic Set Method is a logical rewiring technique. These are compared each other in four optimization points of view : determination of effective rule sets, optimization of common expressions, minimization of number of relational equations, and query information passing strategies.
옥천지역 변성이질암에서 홍주석 반상변정내에 포획된 흑운모
강지훈 안동대학교 기초과학연구소 1996 基礎科學 硏究論文集 Vol.7 No.1
옥천지역에서 쥬라기 옥천화강암의 관입작용과 관련된 규전적-홍주석형 접촉 변성작용 동안의 흑운모 화학조성과 그 화학조정 변화와 관련된 흑운모 6배위와 4배위 양이온돌 사이의 치환관계를 조사하기 위해, 홍주석 반상변정내에 포획된 흑운모들에 대한 전자현미분석(EPMA)을 실시하였다. 분석 결과, 흑운모들의 화학조성(Ti평균 함량 : 0.18-0.31, Al(IV) 평균 함량 : 0.95-0.99, Mg/Mg+Fe* 평균비 : 0.35-0.37)은 시데로필라이트(siderophyllite)와 앤리이트(annite)의 중간 성분에 해당하고, 그들의 평균 구조식은(Ca, Na, K)_(1.81)(Ti, Al, Fe*, Mn, Mg)_(5.68)(Si_(5.36)Al_(2.64))_(8) O_(20)(OH,F)_(4)로 나타나며, 접촉 변성작용은 십자석대 보다 높은 변성조건을 지시하고, Ti함량은 변성도의 지시자로서 이용될 수 있음을 알 수 있다. 흑운모의 화학조성 변화 그림에서는 Ti가 증가함에 따라 Al^(IV)과 Mn은 증가하고 Si, Al^(VI), Fe* 그리고 Mg등은 감소하며, Ti와 Mg/Mg+Fe*비, Ti+Al^(VI)와 Mg/Mg+Fe*비 그리고 Si와 Al^(VI) 사이의 상관 관계는 비례적인 것으로 나타난다. 이는, 접촉변성작용 동안의 흑운모 화학조성 변화는 Mg+Si=Ti+2Al^(IV)치환과 Al^(VI)+Si=Ti+Al^(IV)치환의 결과로서 해석된다. To examine biotite composition, its variations and substitutions between octahedral and tetrahedral cations of biotite during contact metamorphism of sillimanite-andalusite type associated with the intrusion of Jurassic Ogcheon granite in the Ogcheon area, biotites masked in the andalusite porphyroblasts were analyzed by microprobe. They show intermediate composition [average content(Ave.) of Ti: 0.18-0.31, Ave. of Al^(VI) : 0.95-0.99, Ave. of Mg/Mg+Fe* : 0.35-0.37]between siderophyllite and annite with an average structural formula (Ca,Na,K)1.81 (Ti,Al,Fe*,Mn, Mg)_(5.68)(Si_(5.36)Al_(2.64))_(8) O_(20) (OH,F)_(4). It suggests that the effect of contact metamorphism corresponds to higher metamorphic condition than staurolite zone and Ti value can be used as an indicator of metamorphic grade. In diagrams representing the biotite compostional variations, the increase of Ti indicates increase of Al^(IV) and Mn with decrease of Si, Al^(VI), Fe* and Mg. And, Ti vs. Mg/Mg+Fe*, Ti+Al^(VI) vs. Mg/Mg+Fe* and Al^(IV) vs. A1^(VI) show negative correlation, while AF vs. Mg/Mg+Fe* and Si vs. Al^(VI) show positive one. Such compositional variations in biotite can be interpreted as the result of substitutions as follows : Mg+Si=Ti+2Al^(IV) and Al^(VI)+Si=Ti + Al^(IV).
白子勳,姜志勇 제주대학교 1983 논문집 Vol.16 No.-
The cultivating conditions of self-sufficiency were dominated in our nation and a policy for increasing out-put was a serious task. But the price of Agricultural production becomes more important because of the decrease in farming population and expanding circulation of out-put in tune with the developing of national economy. By the increasing ratio of commercial farming the change of agriculcultural product price is just Confronted with rise and fall of agricultural income and the most consummers are purchasing their foods via marckets. Terefore the rise and fall of agricultural price that makes the domester expenditure well and badly off is studied by the bureau of economic promotion. So this study is emphasized on the problem and the improverment of agricultural price. With view point of function and peculiar character of that price, which had been unfavororable to both producters and consummers in formation of agricultural price when that price was unstable at past time.
항결핵 치료과정에서 호전되었다가 악화된 뇌 결핵종 1예 보고
이대훈,유진홍,강미자,김홍기,김선화,고동훈,천지성,유원종 대한화학요법학회 1997 대한화학요법학회지 Vol.15 No.3
In spite of nationmide tuberculosis control program, tuberculosis is still prevalent in Korea. Accordingly, tuberculous meningitis also poses one of the main trouble some problems. Recently, We experienced a perplexing case of tuberculous menin-gitis and tubercdoma in a 24-year old female patient. She was admitted to our hospital owing to meningeal irritation sign, aphasia, VI nerve palsy, and ,fever. CSF analysis showed a finding consistent with that of presumptive tuberculous meningitis.. Initial MRI of the brain revealed a large mass(tuhercu1oma) on left parieto-temporal area. Antitubeculous regimen(1soniazid (INH), rifampin(RMP), ethambutol(EMB), pyrazinamide(PZA)} of meningeal dose was given immediately, and her symptoms and signs were dramatically disappeared with a few days after treatment. She was discharged with improved condition and under maintenance treatment of tuberculosis. Follow-up one year after treatment. revealed that the previous lesion was nearly diminished. She showed no symptom at all until she recognized a total blindness of sudden onset on her left eye a t the 18th month of treatment. Brain MRI checked at that time showed multiple masses of tuberculoma scattered over the brain base and one of them invaded left optic nerve. In our opinion, the cause of relapse in this patient might he explained by the selection and ultimate replication of a minor population of resistant strain. Although such relapse is an extremely rare event, we think that we should always pay attention to this possible resistance problem every time we meet patients with tuberculous meningitis.
신경섬유종증 환자에게서 발생한 특발성 혈소판 감소증 1예
권세훈,김형호,강지인,장재혁,원경준,장재현,김상용,배학연 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.3
Idiopathic thrombocytopenic purpura is a disease characterized by thrombocytopenia in peripheral blood with positive anti-platelet antibody titer, no splenomegaly, the presence of megakarocyte. The causes of idiopathic thrombocytopenic purpura were usually related to autoimmune disease, infection and drugs. A 46-years-old man was admitted for evaluation of abdominal mass. He has many cafe-au-lait spots and nodules in almost skin for 30 years. Several years ago, he palpated mass in Lt. inguinal area. hIe has known the abdominal mass after checking abdomen CT in local clinic and visited our hospital for evaluation of abdominal mass. At admission, laboratory tests showed hemoglobin 12.5 g/dL, hematocrit 38.4 %, WBC 5,460 /㎣ (neutrophil 64.5%, lymphocyte 21.7%, monocyte 4.1%, eosinophil 5.4%), reticulocyte 0.7%, Platelet 52,000 /㎣, total protein 6.51 g/dL, albumin 3.80 g/dL, alkaline pohsphatase 161 IU/L, AST 110.7 IU/L, ALT 64.9 IU/L, total bilirubin 0.44 ㎎/dL, BUN 18.4 ㎎/dL, creatinine 0.79 ㎎/dL. Peripheral blood smear showed normocytic normochromic anemia, thrombocytopenia. Bone marrow aspiration smear showed normoplastic myeloid and erythroid precursor. The bone marrow biopsy section shows normocellular marrow (35%) for his age and mildly increasing myeloid cell lineage. We have experienced a case of idiopathic thrombocytopenic purpura in a patient being in neurofibromatosis and therefore reporting it with documentary records. 저자들은 신경섬유종증 환자에서 특별한 원인을 발견할 수 없었음에도 특발성 혈소판 감소증이 발생한 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다.
정지용,윤나라,강대웅,오종찬,장재현,선길홍,박경희,정종훈,김현리 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.1
Aplastic anemia is a disease characterized by pancytopenia in the peripheral blood and hypocellular bone marrow with the fatty infiltration. The causes of the acquired aplastic anemia were usually related to drugs and immune-related diseases. A 34-years old man was admitted due to general weakness. He has been going hemodialysis for 2 years because of end stage renal disease (ESRD) due to chronic glomerulonephritis. At admission, laboratory tests showed hemoglobin 6.2 g/dL, hematocrit 18.0 %, WBC 5,710mm (neutrophil 71.8%, lymphocyte 19.1%, monocyte 5.9%), reticulocyte 1.9%, platelet 93,000/mm, Fe 12.8 ug/dL, TIBC 204 ug/dL, ferritin 941.47 ng /ml, haptoglobin 0.72 g/L, vitamin B12 508.17 pmol/L, folate 24 ng/mL, total protein 6.54 g/dL, albumin 3.76 g/dL, Alk. pohsphatase 79 IU/L, AST 30.0 IU/L, ALT 39.7 IU/L, total bilirubin 0.57 mg/dl, BUN 79.4 mg/dl and creatinine 10.18 mg/dl. Peripheral blood smear showed the normocytic normochromic anemia with anisocytosis. Anemia was diagnosed but it was irresponsive to the recombinant human erythropoietin (EPO) and blood transfusion. In the bone marrow aspiration smear were there the hypoplastic myeloid and erythroid precursors. The bone marrow biopsy section showed the hypoplasia of all components (10-20%) and the fatty infiltration. We have experienced one case of the idiopathic aplastic anemia in a patient going through hemodialysis and we just report it with documentary records. 저자들은 혈액 투석 중인 환자에서 약물, 면역계 이상등의 원인을 발견할 수 없었음에도 재생 불량성 빈혈이 발생한 1예를 경험하여 문헌 고찰과 함께 보고하는 바이다.