• Journal of Chest Surgery
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• v.36 no.1
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• pp.51-54
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• 2003

This patient was an 53-year-old man who had undergone Sengstaken-Blackmore tube insertion for esophageal varix bleeding. Two days after Sengstaken-Blackmore tube insertion, he developed severe left hemothorax and was transferred to our hospital. The esophagoscopic findings revealed a large perforation lengthening 8-cm in the intrathoracic esophagus. A left thoracotomy was performed 33 days after the injury due to repeated varix bleedings and poor conditions. An 8-cm longitudinal perforation of the intrathoracic esophagus with gross suppurative empyema was found. Primary repair and esophageal exclusion was performed 2cm proximal and distal to the perforation, using rows of nonabsorbable staplers(TA stapler 60 $\times$ 4.8) and large bore thoracostomy tubes were placed for local drainage. Six days after intrathoracic esophageal exclusion, an esophagogram revealed a leakage at just above the proximal stapling site. A cervical esophageal exclusion was performed using the same method. One hundred thirty seven days after exclusion operation for the intra-thoracic esophageal perforation, the patient was able to eat per orally without any secondary esophageal reconstructive surgery.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.350-350
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• 2011

ZnO는 II-VI족 화합물 반도체로서 3.37 ev의 band gap energy와 60 mv의 exciton binding energy를 가지며 차세대 소자로 다양한 분야에서 연구되어지고 있다. ZnO 박막과는 다르게 ZnO nano structure는 효율성과 특성 향상의 이점으로 태양전지와 투명전극 소자에 많은 연구가 되고 있으며 UV 레이저, 가스센서, LED, 압전소자, Field Emitting Transistor (FET) 등 다양한 응용분야에서 연구되고 있다. 본 연구에서는 유리 기판 위에 RF Magnetron sputtering법을 이용해 ZnO buffer layer를 다양한 두께(~1,000${\AA}$)로 증착한 뒤, Zn powder (99.99%)를 지름 2inch 석영관 안에 넣어 Thermal furnace장비를 이용하여 Thermal Evaporation법으로 약 500$^{\circ}C$에서 30분 동안 촉매 없이 성장 하였다. 수직성장된 ZnO 나노 구조체의 특성을 전계방출주사전자현미경(SEM), X-선 회절패턴(XRD), UV-spectra를 이용하여 분석하였다. SEM 분석을 통하여 ZnO buffer layer위에 성장된 ZnO 나노 구조체는 직경이 약 ~50 nm, 길이가 ~2 um까지 성장을 보였으며, XRD 측정결과, ZnO 우선 성장 방향(002)을 확인하였다. 두 가지 측정을 통하여 ZnO buffer layer의 유무에 따라 성장 특성이 향상되었음을 확인하였으며, 이는 buffer layer가 seed 역할을 한 것으로 사료된다. UV-spectra 측정을 통하여 가시광 영역(400~780 nm)에서 60%대의 투과도를 보여 가시광 영역에서 투명성을 요구하는 전자 소자 및 광소자 등에 적용 가능성을 확인하였다. 이 연구를 통하여 우수한 투과도를 가지며 유리 기판위에 수직성장된 ZnO 나노구조체는 태양전지와 플렉서블 디스플레이 등 다양한 활용 분야를 제시할 수 있다.

• Archives of design research
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• v.15 no.1
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• pp.359-368
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• 2002

Fabric art is most distinguished field among the Modern art. Among them, tapestry which begins human history is investigated more and more deeply and till now it displays with various type and exhibition. But, because of the huge scale of the working process, it requires much time and hard endeavor. After sampling, it begins main process in the present situation. But we cannot know exactly whether it goes well or not until it ends. So after fulfilled whole process, we often try new work again. Because of this reason, we devise computer simulation. With computer simulation we can preview whole working and lengthen the planning time, shorten the needless time. Simulation is made up of Scan, Drawing, Line clean up, Rendering, Parity, and Printing. Scan and Drawing can male new idea. And during the Line clean up we can make vector image and modify the image. And then rendering the image and inquiring the length and weight of yarn. Last process is printing an then making a package soft ware by means of prototype. Through these process, many producers and student can easily access to tapestry and reduce the needless time and endeavor.

• Journal of Aquaculture
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• v.16 no.1
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• pp.31-36
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• 2003

Two experiments were conducted for the physiological and growth responses of yearling sea bass, Lateolabrax japonicus (total length 24.4$\pm$1.5 cm, body weight 125.4$\pm$25.4 g) by the manipulation of salinity. To study the physiological responses of the sea bass by acute salinity change, we changed water salinity from 30 ppt into 2 ppt in rearing tank through 1 hour or 6 hour. To access the effect of salinity in the growth of sea bass, we also examined the growth of the sea bass in 2, 10, 20 and 30 ppt for 180 days. After salinity change, all yearlings appeared some stress response and ions changes in blood. The yearlings showed a slow recovery by an acute salinity exchange, but a fast recovery by slow salinity exchange. In the study about the influence of salinity in growth, although the food intake of yearlings in 20 ppt was significantly higher than the yearling in the other salinities, feed efficiency was higher in 10 ppt than the other salinities. However, the food intake and the feed efficiency in 2 ppt were significantly lower than in other groups. The growth of yearlings was significantly faster in 20 ppt than in the other salinities, but the growth showed significantly slower in 2 ppt than in the other salinities.

• Korean Journal of Ichthyology
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• v.18 no.3
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• pp.193-201
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• 2006

We researched the reproductive ecology of pale chub, Zacco platypus that inhabits Gajeong-cheon and Wonju-cheon that are a tributary to the Han river. The nuptial organ was formed on the head part, the anal fin and the tail part in male, the change of nuptial color was outstanding. By their changing body shape, the anal fin was extended and body depth came to be high during the spawning season in both sexes. Territorial male of defending behavior were head butting, rotated fighting, parallel swimming, biting and expelling. After pale chub located himself from the upper of the female that was approached to the side parallelling with the female, male and female spawned digging sand with their anal fin by vibrating and any parental care of the eggs was not taken. The spawning interval and lasting time were relevant to individuals density of spawning ground.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.41 no.8
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• pp.51-57
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• 2004

We have analyzed the effect of out-band dispersion in the cascaded fiber Bragg Elating(FBG) based optical add-drop multiplexers(OADM) when bypassed wavelengths contain SCM signals. In order to compute this impairment the dispersion characteristics of FBG have been analytically calculated by solving their coupled wave equations, and the Fourier method is applied to IMD analysis. The out-band dispersion effects over WDM/SCM signals are analyzed under different and common system situations as: ITU channel spacing(100, 50, 25 GHz), channel density parameter, frequency extension of the SCM plan, modulation characteristics, FBG length, etc. From this results, the transport of WDM/SCM signals in future DWDM transport networks could be limited by this effect which has to be taken into account for designing future networks.

• Journal of the Korean Society of Propulsion Engineers
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• v.5 no.1
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• pp.26-33
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• 2001

Thrust vector control system is control device which is mounted exit of the nozzle to generate pitch, yaw and roll directional force by deflecting flow direction of the supersonic jet from the nozzle. By obtaining control force, jetvane which is exposed in jet flow is working thermal and aerodynamic load. Axial thrust loss and side thrust is affected by shock patterns and interactions between jetvanes according to jetvane geometry and turning angle. In this study, we designed 6 types of jetvane to evaluate pitch, yaw and roll characteristics of ietvane in supersonic flow, and perform the cold flow test in range of turning angles of jetvanes between $0^{\cire}$ and $25^{\cire}$ by $5^{\cire}$ respectively. Also, calculation is going side by side to analyse flow interaction. Results show that there is no interactions between jetvanes upto turning angle 20$^{\circ}$, chord and lead length ratio is very important parameter to aerodynamic performance and maximum thrust loss is appeard to 17% of axial thrust in roll directional control.

• Journal of the Korean Geosynthetics Society
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• v.3 no.1
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• pp.43-52
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• 2004

Laboratory model tests were conducted to assess the behavior characteristics of geogrid reinforced earth walls using fiber-mixed soil backfill with different surcharge loads and reinforcement spacing. The models were built in the box having dimensions, 100cm tall, 140cm long, and 100cm wide. The reinforcements used were geonet(tensile strength, 0.79t/m) and geogrid(tensile strength, 2.26t/m). Decomposed granite soil(ML) with or without polypropylene fiber was used backfill material. Strain gauges and LVDTs were installed on the retaining walls to measure the strain of the reinforcements and the displacements of the wall facings.

• Membrane Journal
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• v.25 no.6
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• pp.515-523
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• 2015

While commercial polystyrene-based ion exchange membranes have simple manufacturing processes, they also possess poor durability due to their brittleness. Poly(ethylene glycol)methyl ether methacrylate with hydrophilic side chains of poly(ethylene glycol) was used as a co-monomer to make the membranes have improved flexibility. Hydrophilicity/hydrophobicity of the anion exchange membranes were able to be adjusted by varying the chain lengths of the poly(ethylene glycol). For the preparation of the anion exchange membranes, a porous PE substrate was immersed into monomer solutions and thermally polymerized. The prepared membranes were subsequently reacted with trimethylamine to produce anion exchange functional groups, Quaternary ammonium salts. The prepared pore-filled anion exchange membranes were evaluated in terms of ion exchange capacity, electric resistance, elongation at break and water uptake.

• Journal of Korea Society of Industrial Information Systems
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• v.13 no.1
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• pp.46-56
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• 2008

Double Patching is a multicasting technique for a VoD system which has been proposed to provide a true VoD service by making clients share a long patching stream as well as a regular stream For subsequent short patching streams, the technique always makes the long patching stream have extra data that will be played back during a double period of a patching window. In this paper, we propose a technique, using the start time of the latest short patching stream, optimizes Double Patching by deleting the useless data included in the long patching stream when the patching window of the long patching stream closes. The mean requirement for the server's bandwidth to provide the true VoD service is used as a performance metric, and the effect of the request inter-arrival time, the size of the client's local buffer and the video length on the mean bandwidth requirement is evaluated. Performance evaluation result shows that the proposed technique optimizes Double Patching in all cases.