• 대한기계학회논문집
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• 제16권5호
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• pp.999-1003
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• 1992

본 연구에서는 Fig.1에 보인 바와 같이 원심휀이 부착된 실내 에어콘을 대상 으로 하여 원심휀의 진동.소음 특성을 연구하였다. Fig.2에서 보인바와 같이 원심휀 은 전기 모터 축에 커플링 되어 있으며 원심휀의 회전으로 발생된 공기유동은 연결된 덕트 시스템(duct system)을 통해 외부로 방출 된다. 이와 같은 송풍시스템에서 발 생하는 진동.소음은 크게 구조물 진동에 의한 구조물진동소음과 공기유동 자체에서 발 생하는 공기유동소음으로 구별된다. 본 연구는 실험적 연구를 통하여 이들 진동. 소 음원의 주파수 특성과 전체 소음에의 기여도 등을 규명하였다.

• Parasites, Hosts and Diseases
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• 제45권2호
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• pp.149-152
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• 2007

A cohort was established for evaluation of cancer risk factors in Sancheong-gun, Gyeongsangnam-do, Korea. As one of the cohort studies, stools of 947 residents (403 males and 544 females, age range: 29-86 years) were screened for Clonorchis sinensis eggs using both Kato-Katz method and formalin-ether sedimentation technique. The overall egg positive rate of C. sinensis was 37.7% and individual EPG (eggs per gram of feces) counts ranged from 24 to 28,800. Eight egg positive residents voluntarily joined a process of collection of the passed worms after praziquantel treatment. A total of 158 worms were recovered from 5 of the 8 treated persons, ranged from 3 to 108 in each individual. The worms were $15-20 mm{\times}2-3 mm$ in size, and showed brown-pigmented, red, or white body colors. This is the first collection record of C. sinensis adult worms from humans through anthelmintic treatment and purgation. The adult worms of C. sinensis may be paralyzed by praziquantel and then discharged passively through bile flow in the bile duct and by peristaltic movement of the bowel.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.387-392
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• 2006

The recent on indoor air problem has led to many studies on the methods and effects of ventilation for better indoor air quality. Although natural ventilation is the most effective and energy-saving method in residental housings, the small size of openable window has been a problem in high-rise residential buildings to ventilate only through natural ventilation. Consequently, the installation of mechanical ventilation system has been a requirement in residential buildings, and has caused other problems such as increase of energy consumption and SBS. Hybrid ventilation which uses forces of both natural and mechanical power has been introduced to solve the problem of increase in energy consumption with natural ventilation. In this paper, two types of hybrid ventilation systems in residential building were introduced. One type was with natural ventilation through vent grille in the window, and another type was with natural ventilation through ceiling duct while both types used mechanical ventilation system with the outlets. The indoor temperature distribution and pollution density distribution in summer while operating the ceiling air conditioner were analyzed through CFD simulation. In this paper, the optimal location of diffusers to achieve thermal comfort would be proposed.

• Parasites, Hosts and Diseases
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• 제57권3호
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• pp.299-302
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• 2019

A clonorchiasis case in a captive leopard cat, Prionailurus bengalensis euptilurus, was confirmed by ultrasonographic findings and egg morphologies found in the bile juice sample in the Korea. The leopard cat was introduced from the wild habitat of Gyeongsangnam-do, to Cheongju Zoo in Cheongju-si, Chungcheongbuk-do, Korea in August 2014. Physical examinations were basically performed for quarantine and check-up health. The cat was comparatively good in health except anorexia. The cyst-like bile duct dilation and the increased echogenicity of gall bladder wall and hepatic parenchyma were observed by ultrasonography. Ultrasound-guided needle biopsy was conducted for collecting bile juice and the specimens were observed under light microscope. The numerous small trematode eggs were detected in the bile juice sample of the light microscopy. The eggs were $25-33(28{\pm}3){\mu}m$ by $18-22(20{\pm}1){\mu}m$ in size and showed typical characteristics of Clonorchis sinensis egg, i.e., a dominantly developed operculum, shoulder rim and dust-like wrinkles in surface. To treat the liver fluke infection, 20 mg/kg of praziquantel was orally administered only once to the case. Follow-up studies including fecal examinations were conducted during 2 years after treatment. But no more eggs were detected from the case. In the present study, we described the first clonorchiasis case of leopard cat, which was confirmed by ultrasonographic findings and egg morphologies from the bile juice sample in Korea.

• 통합자연과학논문집
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• 제16권1호
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• pp.1-12
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• 2023

Leucosia anatum, also known as the pebble crab, is a species of crab that belongs to the family Leucosiidae. Crabs are the most conspicuous and abundant components of the epibenthic macrofauna of the mangrove ecosystems. The present investigation was carried out with the objective of enlightening the reproductive system of L.anatum through histological and histochemical studies. Histological analysis of the epithelial cells of vas deferens, the luminal size and shape of the vas deferens was carried out, since the spermatophore material is secreted and molded by the vas deferens. Histochemical analysis of the blood plasma, testis, proximal vas deferens, middle vas deferens, distal vas deferens, seminal plasma and spermatophore was done to reveal the possible transformation of their secretory materials into the spermatophoric components. Biochemical components present in the blood plasma, testis, proximal vas deferens (PVD), median vas deferens (MVD) and distal vas deferens (DVD) regions seminal plasma and spermatophore of pebble crab were analyzed to find out the quantity of free sugars, proteins, and fats. Thus the current study focuses on the histological and histochemical analysis of Testis and Vas Deferens and their secretions in L.anatum.

• 한국간담췌외과학회지
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• 제26권4호
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• pp.407-411
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• 2022

Mesenchymal hamartoma of the liver (MHL) is a rare benign tumor that often presents in early childhood, and it rarely occurs in adulthood. Aberrant development of the portal tract is a known cause of MHL. Although limited information is available on the natural course of MHL, malignant transformation has been reported in a few cases. Here, we report a case of a 26-year-old female with intrahepatic cholangiocarcinoma secondary to unresected MHL. The patient underwent resection of the hepatic mass, which was diagnosed as MHL at 2 years of age, due to an increase in mass size and a suspicion of malignant transformation during work-up. Histopathology confirmed intrahepatic adenosquamous carcinoma in the background of MHL, with a T2N0M0 pathological stage (stage II). The surgical margin was free from tumor cells. The patient fully recovered postoperatively and started receiving adjuvant chemotherapy. Previous case reports have only reported about the development of undifferentiated embryonal sarcoma or angiosarcoma as malignant transformation of MHL. Cases of other malignancies have not been published; however, it is difficult to rule out the occurrence of various malignancies related to the portal tract when considering the pathogenesis of the disease. To the best of our knowledge, this is the first case report of adenocarcinoma of bile duct origin secondary to MHL. This case report suggests that aggressive surgical management should be considered after the initial diagnosis of MHL.

• 대한기계학회논문집B
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• 제34권1호
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• pp.27-34
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• 2010

본 연구에서는 순환방식의 1000 CMH급 전기집진장치 성능평가 시스템 구축하여, 대용량 순산소 연소 장치 없이 순산소 연소가스 모사 조건(고농도 $CO_2$ 조건)에서 엣지-평판형 전기집진장치를 방전극 형상, 집진판 간격, 유입속도, 가스조성 및 분진 입경에 따라 성능을 평가하였다. $CO_2$ 70% 조건에서 3 종 방전극에 대해 성능 비교를 한 결과, 방전극 편 면적이 넓은 방전극이 상대적으로 높은 포집효율을 나타내었다. 또한 유입속도가 감소할수록, 분진 입경이 증가할수록, 집진판 간격이 좁을수록 분진 집진 효율이 증가하였으나, $CO_2$ 농도가 증가할수록 효율이 감소하였다. 그러므로 $CO_2$ 농도가 높을 것으로 예상되는 순산소 연소 등 배기가스 조건에 적용되는 전기집진장치를 설계할 경우, 기존과 동일한 단위 가스 체적 당 코로나 전력 조건에서 집진장치 내부 유속을 줄이거나 집진판 간격을 좁히는 설계변화가 요구되며, 방전극의 경우 방전편 면적이 넓으면서 코로나 전류가 높은 방전극이 적용되야 할 것으로 판단된다.

• 한국임상수의학회지
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• 제28권6호
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• pp.555-561
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• 2011

본 연구에서는 중 소형견에서 1개의 복강경 통로를 통한 내시경적 담낭 제거술을 실시함으로써, 개에서 최소 침습적 수술로 담낭 절제술을 실시할 수 있는 방법을 확립하기 위하여 실시하였다. 실험 동물로 총 3마리의 수컷 비글견 ($10.3{\pm}0.62$ kg)을 이용하였으며 배꼽 주위에 하나의 절개창을 만든 후 단일 통로 내시경 시스템을 장착하였다. 이 시스템을 통해 내시경과 Maryland 복강경용 겸자로 담낭을 견인, 제거하였다. 3마리 모두 성공적으로 담낭 절제술을 실시하였으며, 수술 후 감염과 같은 합병증은 발생하지 않았다. 또한 술전, 술후를 비교한 혈액, 혈청 검사상에서도 특이적인 소견은 관찰되지 않았다. 술후 7일 후에 이루어진 부검 소견에서도 출혈 및 담즙의 유출 및 복막염 등과 같은 부작용은 관찰되지 않았다. 따라서 본 연구를 통해, 단일 통로를 이용한 내시경 유도하 담낭 절제술은 중소형견에서 실시할 수 있는 복강 수술 방법 중 최소한의 절개를 통해 비침습적으로 이루어질 수 있는 유용한 수술 방법이라 할 수 있다.

• 대한한의학방제학회지
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• 제11권2호
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• pp.213-232
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• 2003

Objectives : This study was designed to establish a characteristic discrimination of internal and external morphological standard of original plants and herbal states in Arisaema amurense var. serratum $N_{AKAI}$ and A. amurense $M_{AXIM}.$. Methods : In this studies, the external-internal morphological standards were determined by using stereoscope and butanol series. Results : 1. In the external shape of original plant, Arisaema amurense var. serratum $N_{AKAI}$ has high stem, an oval-elliptic leaflet and a serrate leaf margin. But A. amurense $M_{AXIM}$ has a relatively low stem, an upside oval leaflet and no serrate leaf margin. 2. On the herbs character of original plant, Arisaema amurense var. serratum $N_{AKAI}$ is small in height and diameter, but A. amurense $M_{AXIM}$ is relatively large in height and diameter. 3. On the gathered herbs character of original plant, the section of Arisaema amurense var. serratum $N_{AKAI}$ is brightly white, easily spilt and strong scent. But the section of A. amurense $M_{AXIM}$ is thin yellowish brown, not easily spilt and weak scent. Also the grade of gathered herbs, both can be classified by diameter and external scent. 4. In the current herbs character, Korean and Sichuan Province products are irregullar shape and have no scent, Jilin Province products are regular shape. Also, Guangxi Province products are small size and concave in one side, Hebei Province products are irregular size and shape. 5. In internal shape of original plant, epidermal cell of Arisaema amurense var. serratum is very tight. With the except of micro difference in parenchyma cell of cortex, on the whole there are nearly no differences with A. amurense $M_{AXIM}.$ Also, samely in the internal shape, according to collecting sites, epidermis exhibits a lot layer in curving state and secreting duct is developed and vascular bundle and exists between parenchyma cell of cortex. Conclusion : In the future, additional study is needed to distinguish herb and effect between same genus-degree of relatedness.

• 대한두경부종양학회지
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• 제9권2호
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• pp.210-220
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• 1993

Histologically proven 465 cases of neck mass in children were analized for the determination of the nature of lesions. Pathologic specimens were obtained during 10 years from January 1981 to December 1989 at Severance Hospital, Yonsei University, College of Medicine. 1) Congenital lesion was most common in neonate(80%) and congenital lesion and inflamatory disease were common in infancy and inflammatory disease was most common in more than one year old children. Thyroglossal duct cyst was most common(35.4%) disease of the congenital lesion. followed by cytic hygroma(34%) and branchial cleft remnants(29.2%). 2) Benign tumors were discovered most frequently in adolescence (55.2%) and thyroid adenoma(23.7%) and epithelial tumor(21.1%) and hemangiomas(19.7%) were most common. Most common malignant tumors were malignant lymphoma (50%) and Hodgkin's disease and were present in the older children. Metastatic cancers were very rare and their primary sites were deductable in all cases. 3) Reactive hyperplasia of lymph node was most common in inflammatory disease(23.7%). Tuberculosis lymphadenitis was more common than nonspecific lymphadenitis. 4) Bilaterality of lesion was commonly seen in malignant disease(41.7%), reactive hyperplasia of lymph node (38.85%) and metastatic disease(33.3%). Size and duration of the masses were not helpful in the differential diagnosis of the cause of the masses. Pediatric neck mass must be evaluated with its characteristics. sites, bilaterality, size and its cange, duration and patient's age but any of these alone cant not be predicted its causes without biopsy or excision. Biopsy or excision can be done with few complication but biopsy of lymph node for diagnosis is carefully made because a large number of lymph node biopsy showed no definite diagnosis in these selected cases of patients.