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      • 탄소 강관(SPPS38) 마찰용접 특성에 관한 연구

        안창윤,민택기 충남대학교 산업기술연구소 1999 산업기술연구논문집 Vol.14 No.2

        This study investigated closely into friction welding of carbon steels pipe(SPPS38) for piping in many fields of industrial, located a variable time, dealt with microstructure and mechanical characteristics. This study's view point was confidence limit in friction welding conditions, the obtained results were as follows. 1.In the friction time was 0.3sec, tensile strength was peak point in this study. The tensile stress was 747MPa, and this was 130% of base metal, when a friction welding condition is 2000rpm, friction pressure is 50MPa, upset pressure 100MPa, friction time is 0.3sec. 2.In friction welding with same conditions, the bending stress was 782MPa. that is 94% of base metal, also not cracked in weld interface about 90 degrees of bending test. 3.In microstructure of weld interface, very small pearlite and ferrite constructed on work at the highest level, like as in bar. And friction times is shortened in a pipe.

      • KCI등재

        Single Median Maxillary Central Incisor(SMMCI) 환아의 증례보고

        신윤경,김영재,김정욱,장기택,이상훈,한세현,김종철 大韓小兒齒科學會 2007 大韓小兒齒科學會誌 Vol.34 No.4

        Anatomic abnormalities of teeth development include the presence of a single maxillary central incisor at midline instead of two central incisors. The incidence of cases with a single maxillary central incisor is approximately 1 in every 50,000 live births. single median maxillary central incisor(SMMCI) may be a integral manifestation of anyone of a number of syndromes. It has been reported an association with several midline disorders which have varied in severity. A SMMCI has also been reported as an isolated finding. But in some cases, it has been considered as an incomplete expression of autosomal dominant holoprosencephaly. So any patient who appears for treatment with a SMMCI should be referred for a detailed medical examination to exclude other associated systemic abnormalities and for mutation analysis to facilitate correct diagnosis and the provision of appropriate genetic counseling. Early orthodontic treatment is needed to minimalize emotional trauma of child. This case report was about three patients with a SMMCI as isolated finding. The purpose of these case reports was to present cases of single maxillary central incisor not associated with other disorders. Single Median Maxillary Central Incisor(SMMCI)는 상악 중절치 형성부전으로 하나의 상악 중절치가 정중앙에 위치하는 치아 발달의 해부학적 이상을 의미한다. 50,000명 중에 1명 꼴로 발생할 정도로 아주 드물며 각종 증후군 및 정중선 이형성을 보이는 발달장애와 연관되어 나타나는 것으로 보고되고 있다. SMMCI는 다른 이상과 연계되지 않고 독립적으로 나타날 수도 있으나 상염색체 우성유전인 전전뇌증(holoprosencephaly)의 경미한 발현일 가능성이 있으므로 유전자 상담이 필요하다. 또 특징적인 안모 및 구강 상태를 보이므로 환아의 바람직한 신체적,정서적 발달을 위해 조기에 교정적 접근이 필요하다. 본 증례는 다른 이상 소견을 보이지 않는 세 명의 SMMCI 환아의 증례를 보고하는 바 이다.

      • KCI등재

        겸상적혈구 혈증에 의한 동통성 발작 1례

        김효철,배택환,정윤석,김현수,조준필,김준식,곽연식 대한응급의학회 1995 대한응급의학회지 Vol.6 No.1

        The sickle cell disease are a group of hemoglobin disorders characterized by red cells that undergo sickle shape transformation when they are deoxygenated. Sickle cell disease is transmit-ted as an autosomal recessive trait. This unusual property, due to the polymerization of sickle hemoglobin results in anemia and vasoocclusive complication. 1) The most clinically significant of these disease are sickle cell anemia, sickle cell hemoglobin C disease, and sickle cell beta thalassemia. Symptoms of pallor, fever, abdominal and joint pain, enlargement of the liver and spleen, swelling of hands and feet first appear near the latter part of the first year of life. Intravascular sickling affects all organs. For clinical and therapeutic purposes, exacerbations may be classified as vasoocclusive or pain, aplastic, hemolytic or sequestration crisis. we experienced a 22 year old female patient who suffered severe multiple joint pain and back pain thought to be caused by vasoocclussive phenomena.

      • KCI등재

        DSM-Ⅲ-R 성격장애 진단의 내용타당도

        양병환,조연규,김창현,황순택,오동열 大韓神經精神醫學會 1996 신경정신의학 Vol.35 No.2

        The purpose of this study was to examine the content validity of DSM-Ⅲ-R personality disorder(PDs). A 3-point rating scale of 150 preliminary diagnostic criteria including 95 DSM-Ⅲ-R PD diagnostic criteria was sent to psychiatrists. Each item in this scale was rated by psychiatrists(n=101) in term of prototypicality to every DSM-Ⅲ-R PD. The results show that each PD criteria set of DSM-Ⅲ-R was registered high level of interrater consistency and items listed in the DSM-Ⅲ-R were, for the most part, rated as very prototypical to their DSM-Ⅲ-R diagnosis. Some criteria were, however, not rated to characteristic features to their DSM-Ⅲ-R diagnosis. 11 items of DSM-Ⅲ-R diagnostic criteria scored high not only to their DSM-Ⅲ-R diagnosis but also other diagnosis. 16 items rated as high prototypicality item of other diagnosis. Another 16 items seemed not to be appropriate to any of DSM-Ⅲ-R PD diagnosis. These results suggest that the content validity of the DSM-Ⅲ-R personality disorder is not so high.

      • KCI등재

        Cervical Headgear와 Anterior bite plate를 이용한 Ⅱ급 부정교합의 치험례

        손동수,이상훈,장기택,박윤정 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.2

        The headgear is an extraoral appliance which used to distal movement of the teeth, inhibition of maxillary growth and reinforcement of anchorage. In case of treatment of Class Ⅱ malocclusion, however, it is not sufficient to simply restrict the horizontal growth of maxilla but to need treatment on mandibular retrusion. Generally, the combination theraphy of activator and headgear is conventional, but other study about combination therapy with other intraoral removable appliance is done. In this case, theatments were done by the combination therapy of headgear and anterior bite plate. The results were followed: 1. Reduction of SNA, upper lip to esthetic plane and lower lip to esthetic plane were observed. 2. 1 to FH plane angle was corrected. 3. Severe overbite, large overjet, and deep curve of spee was corrected. 4. Class Ⅱ molar relation was changed by class Ⅰ.

      • 자동차 조향장치 마찰용접부의 기계적 성질에 관한 연구

        길남규,성기완,안창윤,민택기 충남대학교 공업교육연구소 1999 論文集 Vol.22 No.1

        This study deals with the mechanical properties of welding part, by friction welding of SM45C steel rod and SWS41A yoke which have being used Steering-Joint. The experimental results are summrized as follows ; 1. When CO₂welding is replaced with friction welding, we can get benefit manufacture. 2. The result of tensile test showed the highest tensile strength of 612MPa(150% of base metal strength 402MPa). 3. The result of bending test showed the highest bending strength of 1066MPa(80% of base metal strength 1259MPa).

      • KCI등재

        DNA Analysis of mtDNA COI Gene in the Sharp-toothed Eel (Muraenesox cinereus Forskal) from Yeosu, Jinhae, Jeju, Goseoung, Jangheung and Haenam Populations in Korea Using PCR-aided RFLP

        ( Taeg Yun Oh ),( Sun Beom Jeong ),( Eun Seob Cho ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.4

        The production of the sharp-toothed eel by commercial catch off waters of Korea is annually declined after 1978. This study was carried out to obtain the stock management of the sharp-toothed eel using the PCR-aided RFLP method. The mtDNA COI gene was amplified using species-specific primers and PCR product was observed to 700 bp. Amplified DNA fragments were treated with six kinds of restriction enzymes (BaeHI, EcoRI, PstI, Ksp22, HinfI and HaeIII). The treatment of HaeIII showed a distinct PCR product between Yeosu/Jinhae/Jeju/Goseoung and Jangheung/Haenam populations that were observed from 300 to 400 bp in reference to 100 bp molecular marker. However, DNA fragment within populations had an identical pattern. The phylogenetic homology is 82% between two populations inferred from RFLP PCR product pattern using NTsysPC ver. 2.1. The use of HaeIII plays an important role in discriminating populations. It is thought that adults after over-wintering in the southern part of Jeju migrate to the Yeosu, Jinhae and Goseoung regions to spawn instead of to southwestern waters. Individuals within populations showed a relatively active genetic mixing and migration regardless of geography. However, the genetic ancestor of Jangheung and Haenam populations is appeared to be more adjacent to China or Japan than Jeju.

      • KCI등재

        The Population Genetic Structure of the Japanese Anchovy (Engraulis japonicus Temminck & Schlegel) in the West, South and East Seas of Korea Based on Microsatellite DNA Analysis

        Taeg Yun Oh(오택윤),Joo Il Kim(김주일),Young Il Seo(서영일),Eun Seob Cho(조은섭) 한국생명과학회 2009 생명과학회지 Vol.19 No.2

        본 연구는 2006년 8월경에 어획된 서해, 남해 및 동해 멸치집단을 분석하기 위하여 6종류의 microsatellite로 하였다. 서해멸치의 경우, 샘플수 72마리에 대한 allele 범위가 19-41로 평균 28.5를 보였다. 특히 EJ9 locus에서 평균보다 약 1.4배 많은 41를 나타내었다. 남해멸치의 평균 allele는 24.5로 서해보다는 적었고, EJ2, EJ9, EJ27.1 loci는 평균보다 높은 29-37의 범위를 보였다. 동해멸치는 평균 allele가 25.0으로 EJ35를 제외하면 대부분의 loci에서 평균 이상을 보였다. 그러나 서해, 남해 및 동해멸치의 allele 빈도율은 대부분 0.24 이하로 나타났다. 또한 Hobs보다 Hexp에서 0.5 정도 높은 값을 보였으나 유의성은 없었다(p>0.05). 유전적 다양성도 0.9 이상으로 매우 높은 값을 보였다. 6종류의 microsatellite에 대한 지역간의 유전적 차이 및 거리는 0.258과 0.019로 유의적으로 차이는 없었다(p>0.05). 따라서 서해, 남해 및 동해 멸치계군은 유전적으로 동일한 집단을 형성하고 있는 것으로 판단된다. The characteristics of the population genetic structure of the Japanese anchovy (Engraulis japonicus Temminck & Schlegel) were collected from the West, South and East Seas of Korea in August, 2006 and were compared using six microsatellite DNA loci. In the West Sea population, the range of allele number against 72 individuals was from 19 to 41, the average allele number was 28.5. In EJ9, the allele number had the highest value of 41, this was 1.4 times higher than the average number of allele. The average allele number of the South Sea population was 24.5 that was less than that of West Sea population. In EJ2, EJ9 and EJ27.1 loci, the allele number was higher than average allele number in the South Sea population. In the East Sea population, the average allele number was estimated at 25.0 that most of loci except for EJ35 were higher than average allele number. Allele frequency in the West, South and East Sea populations was below 0.24. The value of observed heterozosity for six loci was approximately 0.5 higher than that of expected heterozosity (p>0.05), but three populations similar values to these heterozosity. Although the genetic diversity was higher value of above 0.9, three populations had a similar value. Genetic differentiation and distance combined estimate of the six loci were 0.258 and 0.019 (p>0.05), respectively, but showed no significant distance between three populations. These results suggested that it is responsible for no differentiated gene pool between three populations.

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