• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.645-649
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• 2009

Liquid desiccant cooling technology can supply cooling by using waste heat and solar heat which are hard to use effectively. For compact and efficient design of a dehumidifier, it is important to sustain sufficient heat and mass transfer surface area for water vapor diffusion from air to liquid desiccant on heat exchanger. In this study, the plate type heat exchanger is adopted which has extended surface, and hydrophilic coating and porous layer coating are adopted to enhance surface wettedness. PP(polypropylene) plate is coated by porous layer and PET(polyethylene terephthalate) non-woven fabric is coated by hydrophilic polymer. These coated surfaces have porous structure, so that falling liquid film spreads widely on the coated surface foaming thin liquid film by capillary force. The temperature of liquid desiccant increases during dehumidification process by latent heat absorption, which leads to loss of dehumidification capacity. Liquid desiccant is cooled by cooling water flowing in plate heat exchanger. On the plate side, the liquid desiccant can be cooled by internal cooling. However the liquid desiccant on extended surface should be moved and cooled at heat exchanger surface. Optimal mixing and distribution of liquid desiccant between extended surface and plate heat exchanger surface is essential design parameter. The experiment has been conducted to verify effective surface treatment and distribution characteristics by measuring wall side flow rate and visualization test. It is observed that hydrophilic and porous layer coating have excellent wettedness, and the distribution can be regulated by adopting holes on extended surface.

• 센서학회지
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• 제6권2호
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• pp.155-162
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• 1997

zinc acetate를 포함하는 용액으로부터 r-plane 사파이어 기판 위에 ZnO 막(膜)을 증착하였다. 초음파(超音波) 발생기(發生器)로 용액을 진동시켜 증기입자를 만든 후 이것을 고온 반응로(反應盧) 내에서 열분해(熱分解) 시켜 막(膜)을 증착하였다. 제조된 막(膜)의 결정성, 표면형태 및 조성을 XRD, SEM 및 AES로 각각 분석하였다. 기판온도가 막(膜)의 특성에 미치는 영향에 대해 조사하였다. 기판온도 $300^{\circ}C$에서 (110) 방향으로 강하게 성장된 막(膜)을 얻을 수 있었다. 구리의 첨가(添加)와 습식산화(濕式酸化)에 의해 막(膜)의 저항율을 $3{\times}10^{6}{\Omega}{\cdot}cm$이상으로 높일 수 있었다.

• Parasites, Hosts and Diseases
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• 제55권5호
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• pp.541-548
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• 2017

A survey was performed to know the infection status of echinostome metacercariae in Cipangopaludina chinensis malleata snails from Korea. Total 75 snails collected in 5 localities, i.e., Imsil-gun, Jeollabuk-do, Hwasun-gun and Shinan-gun (Aphae and Jido), Jeollanam-do, and Jinju-si, Gyeongsangnam-do, were examined for metacercariae by the artificial digestion method. Infection rates of metacercariae were 80.0%, 66.7%, 100%, 60.0%, and 73.3%, and their densities were 39, 32, 183, 19, and 30 per snail infected, respectively. The metacercariae were round, $105-118{\times}105-118{\mu}m$ in size, with a thin cyst wall, collar spines on the head collar, and excretory granules in 2 canals of excretory tube. Adult flukes were elongated, ventrally curved, and $5,167{\times}939{\mu}m$ in average size. Head collar distinct, bearing 45 collar spines with 5 end groups on each side. Oral sucker subterminal, pharynx well developed, and esophagus somewhat short. Cirrus sac well developed, with a saccular seminal vesicle, and ventral sucker very large. Ovary elliptical and on the median line of the body. Testes tandem and slightly lobed. Eggs operculated, elliptical, and $90-103{\times}55-60{\mu}m$ in size. By scanning electron microscopy, the head collar was prominent with 45 collar spines resembling horns of younger stags. Scale-like tegumental spines were densely distributed on the body surface between the head collar and ventral sucker. Conclusively, it has been first confirmed that the life cycle of E. macrorchis is indigenously maintained in Korea, and C. chinensis malleata snails are popularly infected with the metacercariae of this echinostome.

• Journal of Chest Surgery
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• 제43권5호
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• pp.518-521
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• 2010

생후 1일된 환아가 청색증과 심잡음을 주소로 전원되었다. 심장 초음파 검사를 시행한 결과, 폐동맥 폐쇄가 동반되어 동맥관 의존성 폐혈류를 보이는 증상이 심한 엡스타인 기형(Carpentier type C)이었다. 심방화된 우심실의 벽은 매우 얇고 수축력이 저하되어 있었으며 기능적 우심실의 크기가 매우 작고 폐동맥 폐쇄가 동반되어 양심실 교정이 불가능하다고 판단하였다. 생후 1개월 째 우심방 절제 성형술, 심방화된 우심실의 광범위한 절제 후 봉합 폐색, 변형 Blalock-Taussig 단락술을 시행하였다. 환아는 별다른 문제 없이 퇴원하였으며 생후 5개월에 양방향성 상대정맥-폐동맥 단락술을 시행받았다. 저자 등은 심한 증상을 나타내는 신생아 엡스타인 기형에서 우심실 제외 수술을 시행하여 좋은 결과를 얻었기에 보고하는 바이다.

• 한국기계가공학회지
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• 제19권1호
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• pp.114-120
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• 2020

In this study, the process of freezing around two consecutively arranged channel tubes used for evaporator heat exchange was numerically investigated. Numerical results confirmed that the vortex occurred between the front channel and the rear channel and also that the vortex occurred due to the rapid change of the channel at the rear of the rear channel. These vortices were found to play a role in reducing the ice layer to some extent by the growth of the ice layer at the front and rear of the channel tube. The freezing layer showed a tendency to gradually increase as it passed through the channel pipe. As the wall temperature in the channel pipe decreased, the thickness of the freezing layer increased. As the flow rate of water slowed, the thickness of the freezing layer became thicker. In particular, in the case of a slow flow rate of 0.03 m/s, the freezing layers of the front channel pipe and the rear channel pipe were connected to each other. The narrower the channel, the thinner the freezing layer was in both the front and rear channel tubes. It is found that these thin freezing layers are caused by the low thickness of the temperature boundary layer formed around the channel tube.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 춘계학술대회 논문집
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• pp.59-62
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• 1996

Plasma displays (PDP) as a large area wall-hanging display device are rabidly developed with flat CRT, TPT LCD and etc. Especially, AC Plasma Display Panels(AC PDPs) have the inherent memory function which is effective for large area displays. The memory function in AC PDPs is caused by the accumulation of the electrical charge on the protecting layer formed on the dielectric layer. This MgO protective layer prevents the dielectric layer from sputtering by ion in discharge plasma and also has the additional important roll in lowering the firing voltage due to the large secondary electron emission coefficient). Until now, the MgO Protective layer is mainly formed by E-Beam evaporation. With increasing the panel size, this process is difficult to attain cost reduction, and are not suitable for large quantity of production. To the contrary, the methode of shuttering are easy to apply on mass production and to enlarge the size of the panel and shows the superior adhesion and uniformity of thin film. In this study, we have prepared MgO protective layer on AC PDP Cell by reactive magnetron sputtering and studied the effect of MgO layer on the surface discharge characteristics of ac PDP.

• Parasites, Hosts and Diseases
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• 제47권1호
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• pp.25-29
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• 2009

Paragonimus harinasutai metacercariae were found in a species of freshwater crab, Indochinamon ou, collected in a small stream of Namback District, Luang Prabang Province, Lao PDR. Adult flukes were recovered after experimental infection of the metacercariae to dogs. Metacercariae were round or slightly elliptical, $0.666{\times}0.626\;mm$ in average size, and had a thin cyst wall of about $20{\mu}m$ in thickness, a black excretory bladder, convoluted ceca, and some pinkish materials in the body. Adults were somewhat elongated, $95.2{\times}36.5\;mm$ in average size, covered with single-tipped tegumental spines, had a smaller oral sucker than the ventral sucker, a moderately branched ovary, and 5-6 lobulated testes. Eggs were ovoid and bilaterally symmetrical in shape, $79{\times}45{\mu}m$ in average size, and had a uniformly thickened shell. By the present study, it has been confirmed that I. ou is a new second intermediate host for P. harinasutai.

• 대한두경부종양학회지
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• 제25권2호
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• pp.174-177
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• 2009

Parathyroid cyst are rare lesion of the neck and superior mediastinum. They are classified as either functional or nonfunctional based on the presence or absence of hyperparathyroidism. They typically present as a palpable neck mass, or as an incidental finding during neck surgery. So, it must be included within the differential diagnosis of a neck lump. A 48-year old woman was admitted to our hospital for evaluation of left anterior neck mass. Physical finding showed soft, movable, non-tender mass on the lower left third of the neck. Laboratory findings revealed normal thyroid function and normal serum calcium level. On previous history, patient underwent two times sono-guided fine needle aspiration at local clinic, and about 10cc clear watery aspirate was noted. Computerized tomography findings showed non-enhancing hypodense cystic lesion on left thyroid area with tracheal deviation to right side. Preoperative diagnosis was thyroid cyst, and thyroidectomy was planed. Intra-operative finding showed huge cystic mass occupying the left thyroid area and smooth, shiny, semitransparent thin cyst wall was noted, which was loosely attached to the thyroid. The cyst was easily dissected free from the thyroid and surrounding tissues. After cyst removal, pathological study confirmed as a parathyroid cyst.

• Archives of Reconstructive Microsurgery
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• 제11권2호
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• pp.141-145
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• 2002

Rectus abdominis muscle free flap is widely used for breast reconstruction and soft tissue defect in lower leg but donor-site morbidities such as abdominal wall weakness, hernia, bulging are troublesome. Recently, to minimize donor-site morbidity, there has been a surge in interest in deep inferior epigastric perforator(DIEP) free flap preserving the anatomy of rectus abdominis muscle, fascia, and motor nerve. Between August of 1995 and September of 2002, topographic investigation of DIEP was performed during the elevation of 97 cases of TRAM free flap and 5 cases of DIEP free flap. There were 84 cases of breast reconstructions, 12 cases of lower leg reconstructions, and 6 cases of head and neck reconstruction. We could observe total 10 to 12 perforators on each rectus abdominis muscle below umbilicus. Among these, the numbers of large perforators(>1.5mm of diameter) were mean 2.1 in lateral half of rectus abdominis muscle, mean 1.2 in medial half, and mean 0.5 in linea alba and paramedian. DIEP free flap provides ample amount of well vascularized soft tissue without inclusion of any rectus abdominis muscle and fascia and minimizes donor-site morbidity. One perforator with significant flow can perfuse the whole flap. For large flap, a perforator of the medial row provides better perfusion to zone-4 than one of lateral row and, if diameter of perforator is small, $2{\sim}3$ perforators can be used. According to the condition of recipient-site, thin flap can be harvested. As DIEP free flap has many advantage, perforator topography will be useful in increasing clinical usage of DIEP free flap.

• 한국균학회지
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• 제13권3호
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• pp.141-148
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• 1985

이 연구는 효모 세포를 catabolic repression과 derepression시켰을 때, poly-P 합성 및 분해에 직접 관련된 tripoly-Pase와 poly-Pase의 활성도 동태를 조사하여 세포내 인산 대사 조절양상을 해석하고자 하였다. 또 TLC 방법을 통하여 무기 폴리인산을 분석하고, 배양시기 및 인산 첨가배양에 따른 무기폴리인산의 세포내 축적 상태, 세포내 위치, 전환과정을 조사하기 위해 염색을 통한 volutin 과립의 세포학적 관찰을 행하였다. Tripoly-Pase 활성도는 catabolic repression시킨 세포에서 derepression된 세포에 비하여 6배 이상 증가하였으며, poly-Pase 활성도는 산 불용성 무기폴리인산인 poly-P-"B"가 최대 축적량을 나타날 시기에 최대의 활성도를 보였다. Linear poly-P의 분석에서는 tripoly-P가 주로 검출되었고 n>8이상인 poly-P가 다량 검출되었다. catabolic derepression시킨 세포에서 volutin과립의 형성을 세포학적으로 관찰하였을 때, 세포벽에 존재하는 산 불용성 무기 폴리인산이 우선적으로 합성되었으며, 배양함에 따라 세포질, 핵 또는 액포로 전이되었다.