동강의 어류상과 생태학적 군집분석

최준길 ( Jun Kil Choi ),오사무미타무라 ( Osamu Mitamura ),이동준 ( Dong Jun Lee ),신현선 ( Hyun Seon Shin ) 한국환경생태학회 2008 한국환경생태학회지 Vol.22 No.6

2006년 5월부터 2007년 5월까지 동강의 어류상과 생태학적 군집분석을 조사한 결과는 다음과 같다. 조사된 어종은 총 10과 31종이었다. 총 31종의 어종 중 일차담수어가 26종, 주연성 담수어가 5종으로 나타나 일차담수어의 구성비가 매우 높았다. 우점종은 참갈겨니(Zacco koreanus) 55.73%, 아우점종은 쉬리(Coreoleuciscus splendidus) 7.15%였으며, 우세종은 배가시리(Microphysogobio longidorsalis) 6.12%, 어름치(Hemibarbus mylodon) 4.87%, 참종개(Iksookimia koreensis) 4.49% 등이었다. 한국고유종은 묵납자루(Acheilognathus signifer), 줄납자루(A. yamatsutae), 가는돌고기(Pseudopungtungia tenuicorpus), 쉬리(C. splendidus), 긴몰개(Squalidus gracilis majimae) 그리고 어름치(H. mylodon) 등 19종(61.29%)으로 고유종의 빈도가 매우 높았으며, 천연기념물이 1종, 환경부지정 멸종위기 야생동물 II급 종이 5종으로 각각 확인되었다. 예상되는 종수(기대종)의 분석 결과, 동강의 전 조사지점에서는 18(지점 4, 5)∼22종(지점 3)이 서식하고 있을 것으로 나타났으며, 유사도 분석은 62.28%(지점 1과 2)∼84.13%(지점 1과 5)의 범위로 나타났다. 따라서 동강유역은 어류가 서식하기에 매우 적합한 수환경을 유지하고 있으며, 각 조사지점별 수환경도 매우 유사한 것으로 판단된다. The ichthyofauna and ecological community analysis in the Dong River, Korea, were investigated from May, 2006 to May, 2007. During the surveyed period, 31 species belonging 9 families were collected. Total of 31 species(primary freshwater: 26 species, peripheral freshwater: 5 species) were found with the primary freshwater fishes being highest. Dominant species was Zacco koreanus(55.73%), and subdominant species was Coreoleuciscus splendidus(7.15%). Also, Microphysogobio longidorsalis (6.12%), Hemibarbus mylodon(4.87%), Iksookimia koreensis(4.49%) were numerous. There were 19 Korean endemic species(61.29%), including Acheilognathus signifer, A. yamatsutae, Pseudopungtungia tenuicorpus, C. splendidus, Squalidus gracilis majimae, H. mylodon. Among them, 1 species was identified as qualifying for possible desigantion as a natural monument catergory, and 5 species were identified for designation required to protect under a wildlife category. As result of expected number of species according to rarefaction curve, the expected species of the Dong-river ranged from 19(St. 4, 5) to 22(St. 3) and result of similarity analysis ranged from 62.28%(St. 1 and 2) to 84.13%(St. 1 and 5). In conclusions, we could define that the Dong-river has a very good water conditions as habitat of fish, and habitat conditions also are very similar in every survey sites.

VCTFK의 반복피로에 의한 소손 패턴의 특성 해석

최충석,송길목,김동우 한국안전학회 2004 한국안전학회지 Vol.19 No.4

In this paper, we analyzed on the characteristics of the stranded wire disconnected by repeated stress. The stranded wires that were used in the experiment are PVC insulated flexible cords(VCTFK: Vinyl Insulated Vinyl Cabtyrc Cord Flat-type) of 0.75mm², 1.25mm², and 2.Omm². They are used to connect the load in low voltage. The stranded wires disconnected by repeated stress were magnified with optical microscope. Using X-ray, the disconnected wire were photo-graphed. we compared mechanical characteristics of the stranded wire between disconnected tendency and allowable current. On the mechanical strength of vinyl cap tire ellipse type cords under bending stress, VCTFK of 1.25mm²was the strongest of them. When it was bent 826.3±7 times, it appeared the disconnected tendency that element wires of VCTFK of 1.25mm²are more about 1.67 times than element wires of VCTFK of 0.75mm². In mechanical strength, VCTFK of 1.25mm² is higher about 1.7 times than VCTFK of 0.75mm². Therefore, we found out that mechanical strength was higher, when the wire had a lot of element wires. In comparison with bending stress, VCTFK of 1.25mm²is the strongest among samples, and it is the most useful in wires of movable type.

누전차단기 외함 전원측 단자사이의 트래킹에 의한 탄화특성 분석

최충석,송길목,김동우 한국화재소방학회 2003 한국화재소방학회논문지 Vol.17 No.4

본 논문은 누전차단기 외함 전원측 단자사이에서 발생하는 전기화재 원인에 대한 분석을 연구하였다. 누전차단기는 보호범위의 전기시설물에서 누전 또는 과부하에 의한 차단을 목적으로 한다. 누전차단기의 전원측 단자는 트래킹에 의해 화재로 쉽게 이어질 수 있다. 따라서, 누전차단기의 재현실험을 통해 트래킹시료(E₁)와 화재현장에서 트래킹된 것(S₁)을 비교분석하여 전기화재의 원인을 밝히는데 중요한 자료가 되도록 하였다. 실험은 IBC Publ. 112법을 응용하여 실시하였고 누전차단기에서 미소방전과 건조대가 발생한 후 소손되는 것을 확인하였다. E₁센서 전원측 단자간의 절연저항은 약 25.7Ω이고 S₁ 절연저항은약 58.6Ω이었다. E₁의 발열피크는 491.0℃ 603.2℃였다. 603.2℃에서의 발열피크는 트래킹에 기한 것이다. S₁의 발열피크는 593.1℃에서 나타났다. 트래킹에 의해 변화된 시료는 IR 흡수스펙트림에서 1590 cm-¹ 서 흡광피크가 나타나지 않았다. In this paper, we studied on the characteristics of RCD(Residual Current Device) case deteriorated by tracking, and compared the tracked samples between in the site of fire(S₁) and in the reappearance experiment(E₁). This experiment is applied to IEC Publ. 112 method. Electrical fire by tracking occurred after scintillation and dry-band generated. The insulation resistance between source terminals of RCD case was about 25.7 Ω in E₁ and the resistance was about 58.6 Ω in S₁. The exothermic peaks of E₁ appeared at 491.0℃ and 603.2℃. The exothermic peak at 603.2℃ was shown by tracking. And the exothermic peak of S₁ appeared at 593.1℃. In spectrum of S₁ and E₁, absorption peak didn't appear at near 1590 cm¹.

태반조직 및 영양막질환조직내 c-myc종양유전자단백 및 표피성장인자 수용기의 표현에 관한 면역조직학적 연구

유길동,최종상,이대일 고려대학교 의과대학 1992 고려대 의대 잡지 Vol.29 No.3

Placenta is the supplying source to fetal development which is the one of the most rapid growing tissue in the human. Cytotrophoblasts and syncytiotrophoblasts found in normal and diseased conditions are identical histological shapes under the light microscopic observations. in spite of a suspision that there are some functional and antigenic differences between the normal and diseased conditions. Epidermal growth factor(EGF) is believed to act as a stimulant and/or a regulator to proliferating tissue and also known is the fact that EGF-R is distributed in the normal placental tissue. The author has been interested to evaluate the differences in EGF-R distribution in normal young and aged placental tissues with trophoblastic diseases, such as partial and complete moles. invasive moles. and choriocarcinomas. In addition. c-myc oncoprotein was studied to find some possible different expressions among those conditions, including hydropic changed gestational products. The results obtained are as follows: 1. The EGF-R is expressed on cytotrophoblasts and syncytiotrophoblasts in young placental tissue and syncytiotrophoblasts along the microvillous membranes in term tissue and syncy-tiotrophoblasts along the microvillous membranes in term placental tissues and the intensity of the expression is decreased along the aging. 2. The EGF-R is focally expressed on the cyto- and syncytiotrophoblasts of the villi found in oblasts of the partial, complete, and invasive moles. 3. The EGF-R is expressed on the cytoplasms of cytotrophoblasts of choriocarcinoma tissues. 4. The c-myc oncoprotein is expressed on the nuclei of the cytotrophoblasts, in the normal placental tissues and in the villi of hydropic changed young placental tissue. 5. The c-myc oncoprotein is expressed in cytoplasmic membranes of syncytiotrophoblasts of the partial, complete, and invaive moles and choriocarcinoma tissues, without nuclear expressions. With the above results, the author can suggest to use EGF-R as a diagnostic tool to differentiate hydropic changed young placenta from partial and complete mole at the biopsied specimens.

계획에 없던 중환자실 재입실 실태 및 원인

송동현,이순교,김철규,최동주,이상일,박수길 한국의료QA학회 2003 한국의료질향상학회지 Vol.10 No.1

Background : Because unplanned readmissions to intensive care unit(ICU)might be related with undesirable patient outcomes, we investigated the pattern of and reason for unplanned ICU readmission to provide baseline data for reducing unplanned returns to ICU. Methods : The subjects included all patients who readmitted to ICU during the same hospitalization at a tertiary referral hospital between January 1st and June 30th 2002. Quality improvement(QI) nurse collected the data through medical records and a medical director reviewed the data collected. Results : 1)The average unplanned ICU readmission rate was 5.6%(gastroenterology 14.6%, pediatrics 12.7%, pulmonology 11.9%, neurosurgery 6.3%, general surgery 5.3%, chest surgery 3.9%, and cardiology 3.3%). 2)Among the unplanned readmissions, more than 50% of cases were from patients older than 60 years, and the main categories of diagnose at hospital admission were neurologic disease(29.9%) and cardiovascular disease(27.6%). 3)Of unplanned ICU readmissions, 41.8% had recurrence of the initial problems, 44.8% had occurrence of new problems. And 9.7% required post-operative care after unplanned operations. 4)The most common cause responsible for unplanned ICU readmission were respiratory problem(38.3%) and cardiovascular problem(14.3%). 5)About 40% of unplanned ICU readmission occurred within 3 days after ICU discharge. 6)Average length of stay of the readmitted patients to ICUs were much longer than that of non-readmitted patients. 7)Hospital mortality rate was much higher for unplanned ICU readmitted patients(23.6%) than for non-readmitted patients(1.5%)(P<0.001). Conclusions : This study showed that the unplanned ICU readmitted patients had poor outcomes(high morality and increased length of stay). In addition study results suggest that more attention should be paid to patients in ICU with poor respiratory function or elderly patients, and careful clinical decisions are required at discharged from ICU to general ward.

Seed Germination in the Vitaceae : Ⅰ. Responses of Parthenocissus tricuspidata Seeds to Stratification and Temperature

金善圭,李大鎭,金吉龍,崔東龍,李英喆 충북대학교 농업과학기술연구소 1990 農業科學硏究 Vol.8 No.1

Influence of moist chilling at 3°C and subsequent germination temperature on seed germination of Parthenocissus tricuspidata (Sieb. & Zucc.) Planch. Was studied. 1.Seed germination of P. tricuspidata increased between 20° and 25°C by prolonged chilling of 8 to 12 weeks. 2.Percent seed germination was higher at 20°C than 25°C, but germination rate was higher at 25°C. 3.Length of time for germination(LTG) and germination span (GS) in days were decreased by prolonged chilling. LTG and GS were also lower at 25°C than 20°C. 4.P. tricuspidata seemed to be a dark germinating species.

신경섬유종증-제 2형의 진단과 치료 : 16례의 임상경험 Experience of 16 Cases

김정은,백선하,김종수,이상형,오창완,김동규,정희원,김현집,조병규,한대희,최길수 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.12

Neurofibromatosis type 2(NF-2) is a dominantly inherited disorder characterized by the occurrence of bilateral acoustic neurinomas and the frequent association of other central nervous system tumors. We present a retrospective review of 16 patients with NF-2 who were treated at our hospital from 1984 to 1995 in 13 cases, the diagnoses of Nf-2 were based on the criteria developed at the Consensus Development Conference of National Institute of Health in the United States, and in another 3 cases. the criterias of NF-2 were not fully satisfied, but the diagnoses of NF-2 were highly suspected. The average age of the patients was 27.6 years, ranging from 13 years to 56 years. The most common symptom was hearing difficulty : intervals between symptom onset and deafness ranged from 8 months to 6 years(mean : 2.9 years) One family of NF-2 was documented consisting of a sister a brother and their mother. Nine patients underwent operations on unilateral acoustic neurinomas : these were subtotally removed in eight patients and totally in one patient Among these patients five were deaf on the ipsilateral side at surgery. Among the other four patients with useful hearing before surgery, hearing was preserved to preoperative status in two patients. Four patients with diagnoses of meningioma, received operations to relieve mass effect with subtotal removal in two patients and total removal in the other two. Early diagnosis and treatment are the most important in the management planning of patients with NF-2 for reasons of early manifestation and rapid progression of the disease.

삼차신경통과 반측 안면 경련에 대한 미세혈관 감압술의 단기성적

곽호신,정천기,김현집,오창환,정영섭,김동규,정희원,최길수,한대희 대한신경외과학회 1994 Journal of Korean neurosurgical society Vol.23 No.4

The result of microvascular decompression (MVD) in 105 consecutive cases is presented. The symptomatic vasculoneural compressions including tumor, vascular malformation, or aneurysm are excluded in this study group. The 41 patients with trigeminal neuralgia (TN) were all treated by posterior fossa exploration (PFE). Eighteen of them were treated with MVD only, another 14 with partial sensory rhizotomy (PSR) only, and in the other 9 patients, MVD and PSR were performed together. Sixty-two of 64 hemifacial spasm (HFS) cases were treated succesfully with MVD via PFE. However in one case of which the offending vessel was not identified, neurolysis was camed out. The other case who had both TN and HFS, died due to intraoperative cardiac arrest The result of operation was evaluated at one month after the operation. In TN, among thirty-nine (98%) patients who resulted in pain-improvement, 32 (82%) experienced complete resohition of the pain.,The rate of complete pain-relief was higher in the 'MVD only group' than in 'group with PSR': Amomg 62 (94%) cases of HFS, 29 (47%) patients obtained 'complete cure' and 'improvement-only' respectively only 4 (6%) patients had no change of the spasm. The preoperative clinical characteristics, intraoperative surgical fingdings and postoperative outcomes were itemized and analyzed to find out the prognostic factors. The our results are compared with others in the literature.

A Study on Smart Heat Radiating Sheet for Protecting Electronic Equipments on the Ship

Choi, Dong-Soo,Kim, Dong-Il,Kim, Doh-Yeol,Choi, Dong-Han,Kil, Gyung-Suk,Kim, Jae-Hwan Korean Institute of Navigation and Port Research 2011 한국항해항만학회지 Vol.35 No.7

In this paper, we developed a Smart Heat Radiating Sheet(SHRS) having the absorption ability of more than 15 dB, and thermal conduction rate more than 20 W/mk for port logistics RFID(Radio Frequency IDentification) system by using AMP(Amorphous Metal Powder) and shielding sheet. Firstly, the EM(Electro_Magnetic) wave absorber samples were fabricated by using AMP and CPE (Chlorinated Polyethylene) with different composition ratios of 80 : 20 wt.% and 85 : 15 wt.%, respectively. Secondly, we fabricated the Smart Heat Radiating Sheet using the shielding sheet to attach EM Wave Absorber. As a result, the Smart Heat Radiating Sheet with absorption ability of 16 dB at 433 MHz and thermal conduction rate is 24 W/mk has been developed with the composition ratio of Amorphous Metal Powder : CPE = 85 : 15 wt.% and thickness of 5.5 mm.

A Study on Smart Heat Radiating Sheet for Protecting Electronic Equipments on the Ship

Dong Soo Choi,Dong Il Kim,Doh Yeol Kim,Dong Han Choi,Gyung Suk Kil,Jae Hwan Kim 한국항해항만학회 2011 한국항해항만학회지 Vol.35 No.7

In this paper, we developed a Smart Heat Radiating Sheet(SHRS) having the absorption ability of more than 15 ㏈, and thermal conduction rate more than 20 W/mk for port logistics RFID(Radio Frequency IDentification) system by using AMP(Amorphous Metal Powder) and shielding sheet. Firstly, the EM(Electro_Magnetic) wave absorber samples were fabricated by using AMP and CPE (Chlorinated Polyethylene) with different composition ratios of 80 : 20 wt.% and 85 : 15 wt.%, respectively. Secondly, we fabricated the Smart Heat Radiating Sheet using the shielding sheet to attach EM Wave Absorber. As a result, the Smart Heat Radiating Sheet with absorption ability of 16 ㏈ at 433 ㎒ and thermal conduction rate is 24 W/mk has been developed with the composition ratio of Amorphous Metal Powder : CPE = 85 : 15 wt.% and thickness of 5.5 ㎜.