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서해안 양식 넙치에서 Neoheterobothrium 감염증의 발생 및 치료
장환,문진산,김지연,조성준,손성완,Jang, Hwan,Moon, Jin-San,Kim, Ji-Yeon,Joh, Seong-Joon,Son, Seong-Wan 대한수의학회 2007 大韓獸醫學會誌 Vol.47 No.3
Neoheterobothrium hirame (N. hirame) is a large blood-feed gill-worm infecting the highly prized olive flounder. The present study was reported the occurrence and elimination of Neoheterobothrium infection from young cultured oliver flounder in the western coast of Korea. Flounder (weight 18-25 g, length 10-15 cm) were obtained from a cultured farm at Taean of Korea at May 2006. A lot of flounder died with serious anemia. We isolated N. hirame from the buccal cavity wall of dead flounder. Adult parasites were 5-15 mm in total length, with 4 pairs of clamps on the pedunculated haptor and isthmus region embedded in host tissue, while immature and sub-adults were identified the attachment to the gill filaments, rakers and arches with the clamps. All fish with infection were treated with 8% NaCl-supplemented seawater for 1 and 10 min at $22^{\circ}C$, respectively. The significant reduction in mortality (6.7%) was observed among fish treated with 8% salt water for 10 minutes, when compared with that of non-treatment group (100%).
양식 넙치에서 Vbrio anguillarum 및 Ichthyobodo sp.에 의한 혼합 감염증의 발생 및 치료
장환,문진산,조성준,김지연,손성완,Jang, Hwan,Moon, Jin-San,Joh, Seong-Joon,Kim, Ji-Yeon,Son, Seong-Wan 대한수의학회 2007 大韓獸醫學會誌 Vol.47 No.3
The high mortality (65.5%) of young olive flounder (Paralichthys olivaceus) showing skin ulcers occurred in fish obtained from a commercial cultured farm at Donghae on the eastern coast of Korea at March 2006. The dorsal skin showed ulcer lesions and large amount of mucus. We isolated Ichthyobodo sp. from the gill, and Vibrio anguillarum from the liver and kidney of dead and diseased fish. All of the fish infected with the V anguillarum and Ichthyobodo sp. were treated with 100 ppm formalin for 1 h, and treated with oxolinic acid for 4 h at $22^{\circ}C$, respectively. The formalin treated group was observed the low mortality (2.9%) when compared with high mortality of non-treated (82.9%), and of antibiotic treated group (85.9%) against mixed infections by Vibrio anguillarum and Ichthyobodo sp. organisms. We confirmed complete elimination against mixed infections of Vibrio anguillarum and Ichthyobodo sp. with 100 ppm formalin treatment.
장환,Jang, Hwan 대한양돈협회 1995 養豚 Vol.17 No.8
개선충증의 발생을 예방하기 위해서는 1년에 가을과 봄 2회에 걸쳐 구제제를 투약하는 것이 좋다. 개선충증이 이미 발생한 뒤 치료하는 경우는 예방을 목적으로 정기적으로 구충하는 경우보다 경제적인 손실이 더욱 크다. 돈군내 개선충이 전혀없거나 개선충으로 인한 피해가 전혀없는 경우를 제외하고는 개선충으로 인한 경제적 손실을 예방하기 위해서 규칙적인 예방적 치료를 행하는 것이 더욱 좋다
두부외상 환자의 신경정신의학적 평가(I) : 외상후 기질성정신장애 환자에서 뇌의 구조적 및 기능적 검사소견의 비교
이장호,장환일,Yi, Jang Ho,Chang, Hwan-Il 대한생물정신의학회 1996 생물정신의학 Vol.3 No.1
The Evaluation of patients complaining of psychiatric symptoms following head injury is much affected by the results of various tests. The objecive of this paper is to investigate the effectiveness of each lest by comparing the structual and fuctional brain studies. The subjects were 93 organic menial disorder in and out patients at the Dept. of Neuropsychiatry of the Kyung Hee University Hospital. After carrying out MRI, CT, SPECT, EEG, the results of each were analysed for the sesitivity and ability to detect focal lesion. The degree of inter-test correlations of lest results were also investigated. Furthermore, the characteristic features of psychological tests were studied and the relationship between each of above mentioned tests and psychological test was examined. As for the test sensitivity to diagnosis, the SPECT was the most superior followed by MRI, CT, EEG in thai order. In the case of abnormality, SPECT ranked 1st in detection of focal lesion, followed by MRI, CT in that order. In the inter-test result correlation, the correlation of SPECT-MRI was statistically significant. When mare than moderate abnormality EEG finding was reported, it correlated significantly with that of MRI findings. In the MMPI, the average scores on F, Hs, D, Hy, Pa, Pt, Sc subscales were above 60. Abnormal SPECT group scored significantly high on the F, Pd, Pa, Sc, Ma scales and therefore in comparison ot the SPECT normal group, displayed more psychotic features. In K-WAIS, the mean full scale IQ was down to 77. 23(Verbal IQ : 78.76, Performance IQ : 77.44) but there was no characterogic significant relationship between the lowered to and abnormal SPECT, MRI, CT and EEG results. In conclusion, 1) The SPECT was mast superior in sensitivity and detection of focal lesions. In comparision with other tests, the results of SPECT correlated well with MRI had thus is thought to be very usefull testing method in the evaluation of organic mental disorder patients. 2) The MRI had relatively high sensitivity, ability to detect focal lesion and superior correlation with other test. 3) Although EEG fared less an sensitivity in comparison to other tests, the results of above moderate abnormal grade group and that of MRI correlated significantly. 4) In the MMPI highly scored in F, Hs, D, Hy, Pa, Pt, Sc subscales and abnormal SPECT patients were shown to display more sever psychotic features. There was no significant character relationship between the lowered IQ(in K-WAIS) and abnormal findings on MRI, CT, SPECT, EEG.
지능형 지속 위협(APT) 시나리오 분석에 의한 슈퍼컴퓨터 보안 요구 사항
장환 ( Hwan Jang ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.1
매년 슈퍼컴퓨터를 표적으로 공격이 증가하고 있고, 공격의 방식은 날로 진화하고 있다. 슈퍼컴퓨터를 대상으로 하는 공격에 대응하기 위해 기존의 연구는 공격 특성을 분석하여 맞춤형 대책을 제시하거나 분석을 통해 보안 요구사항을 도출하였다. 하지만 연구과정에서 APT life cycle 관점이 반영되지 않으면, 지능형 지속 위협인 APT를 인지 및 대응하기 어려운 문제점이 있다. 이러한 문제점을 해결하기 위해, 본 논문은 APT 시나리오 기반의 위협 모델링 분석을 통해 슈퍼컴퓨터 보안 요구사항을 도출 한다.
장환 ( Hwan Jang ),박경재 ( Kyung Jae Park ),이청산 ( Cheong San Lee ),곽학구 ( Hak Koo Kwak ) 한국가축위생학회 1999 韓國家畜衛生學會誌 Vol.21 No.1
This study was carried out to investigate the prevalence of antibody against Toxoplasma gondii in the dog by Latex agglutination test and Indirect fluorescent antibody test. Two month-old dogs were infected intraperitoneally with T gondii to observe histopathological and immunohisto-chemical changes. Results obtained through this experiment were summarized as follows; 1. Among the serum samples of 163 heads of the dog, 10 samples(6.1%) were positive. 2. In the sex, 6 heads (7.1%) out of 84 female dogs and 4 heads(5.1%) out of 79 male dogs were positive. However, there were no significant differences between the male and female. 3. Overall proportion of agreement between indirect fluorescent antibody and Latex agglutination test in 163 sera of dogs was 97.5%. 4. When 2 month-old dogs were infected intraperitoneally with T gondii, main clinical signs were intermittent fever, dyspnea, diarrhea. In general, the infected dogs recovered closely on the 11th day of post-inoculation. 5. At necropsy, petechial and ecchymotic hemorrages and swelling in small intestine, lung, spleen, liver and kidney were observed. 6. In histopathological observation, interstitial pneumonia, hyperemia and hemorrhages in lung were observed. Focal necrosis of hepatocytes, the neutrophil and basophil in the renal tubular epithelium were observed. 7. By immunohistochemical staining using Vectorstain ABC kit, the positive cells were recognized in the lung and the liver. 8. By indirect fluorescent antibody test, the Toxoplasma antibodies in the infected dogs were detected on the 15th day of postinoculation.
Computer Simulation에 의한 도로교통소음 예측결과 비교 연구
장환(Hwan Jang),방민(Min Bang),김흥식(Heung-Sik Kim) 한국건축친환경설비학회 2008 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
The various computer programs are used in computer simulation of the traffic noise prediction. But the difference or problem of calculation method used for road traffic noise prediction is not exactly investigated. In this paper, Road traffic noise is predicted on the specific regions by using five prediction methods such as XPS31-133(France). CRTN(United Kingdom), RLS-90(Germany), ASJ RTN-Model 2003 (Japan) and FHWA TNM(US.A.). which are operated by a program named SoundPLAN. a program to predict road traffic noise. The results show that five prediction methods are a little different for prediction of traffic noise.