• Archives of Plastic Surgery
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• v.42 no.6
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• pp.761-768
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• 2015

Background Surgical scars on the palmar surface of the hand may lead to functional and also aesthetic and psychological consequences. The objective of this study was to introduce a new incision technique for periarterial sympathectomy of the hand and to compare the results of the new two-step incision technique with those of a Koman incision by using an objective questionnaire. Methods A total of 40 patients (17 men and 23 women) with intractable Raynaud's disease or syndrome underwent surgery in our hospital, conducted by a single surgeon, between January 2008 and January 2013. Patients who had undergone extended sympathectomy or vessel graft were excluded. Clinical evaluation of postoperative scars was performed in both groups one year after surgery using the patient and observer scar assessment scale (POSAS) and the Wake Forest University rating scale. Results The total patient score was 8.59 (range, 6-15) in the two-step incision group and 9.62 (range, 7-18) in the Koman incision group. A significant difference was found between the groups in the total PS score (P-value=0.034) but not in the total observer score. Our analysis found no significant difference in preoperative and postoperative Wake Forest University rating scale scores between the two-step and Koman incision groups. The time required for recovery prior to returning to work after surgery was shorter in the two-step incision group, with a mean of 29.48 days in the two-step incision group and 34.15 days in the Koman incision group (P=0.03). Conclusions Compared to the Koman incision, the new two-step incision technique provides better aesthetic results, similar symptom improvement, and a reduction in the recovery time required before returning to work. Furthermore, this incision allows the surgeon to access a wide surgical field and a sufficient exposure of anatomical structures.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.53 no.4
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• pp.430-436
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• 2017

The most frequent occurring and the serious marine casualties in fishing vessels are the collision in statistics from Korea Maritime Safety Tribunal (2008-2015). Collisions are is given a great deal of weight in all marine casualties, and the main cause of collisions is the negligence of watching. From this point of view, this study deals with the collision and its immediate cause, the negligence of watching which are main factors on the indirect causes. Basic analyzing data was gathered from the questionnaire made by experts of sea service part, and analyzed by using the fault tree analysis (FTA). From the result of the study, the occurrent probability of the negligence of watching in the collision due to the indirect causes occupied 64.9%, and its probability caused by the man factors was less than the other factors; i.e. the media factors and the management factors. For the reduction of the negligence of watching in the collision from this study, it needs an effort to remove not only the man factors, but also the media factors and management factors.

• Applied Biological Chemistry
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• v.44 no.4
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• pp.230-234
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• 2001

Traditional doenjang was fermented in different vessels, and its quality characteristics were investigated during ripening. Fermentation vessels used were dark brown glaze pot, dark brown glaze pot with glass lid and plastic box. Water content of doenjang decreased during fermentation, with doenjang pepared in dark brown glaze pot with glass lid showed the highest water content reduction. Water-soluble nitrogen content $(4.56{\sim}5.80%)$ was the highest at 8 months fermentation and amino type nitrogen content continuously increased until 12 months, with doenjang in dark brown glaze pot higher than those in plastic box. Sensory evaluation revealed the quality of doenjang fermented in plastic box was significantly lower than others after 4 months.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.12 no.2
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• pp.171-178
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• 2014

After the expiration of operating license of a plant, all infrastructures within the plant must be safely dismantled to the point that it no longer requires measures for radiation protection. Despite the fact that Kori 1 and Wolsong 1 are close to the expiration of their operating license, sufficient technologies for radiological characterization, decontamination and dismantling is still under development. The purpose of this study is to develop one of methods for radiological inventory assessment on measuring object by using direct measure of large component with In-Situ measurement technique. Radiological inventory was assessed by analyzing nuclide using portable gamma spectroscopy without dismantling reactor head, and the result of direct measurement was supplemented by performing indirect measurement. Radiochemical analysis were performed on surface contamination samples as well. During the study, radiological inventory of reactor vessel calculated expanding the result. Based on the result and the radioactivity variation of each radionuclides time frame for decommissioning can be decided. Thus, it is expected that during the decommissioning of plants, the result of this study will contribute to the reduction of radiation exposure to workers.

• Journal of Environmental Impact Assessment
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• v.18 no.5
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• pp.245-256
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• 2009

해사채취 선박에 설치된 월류수 저감장치의 효율성을 파악하기 위하여 월류수 저감장치가 설치된 선박과 설치되지 않은 선박의 작업시 부유사 농도를 관측 비교하였다. 부유사 관측결과 월류수 저감장치가 설치된 선박과 설치되지 않은 선박의 작업시 부유사 농도는 부유사 발생원으로부터 거리가 멀어질수록 감소하는 경향을 보였고, 1km 정점부터 배경농도와 비슷한 농도를 나타내었다. 월류수 저감장치의 사용여부에 따른 부유사 농도를 비교 분석한 결과 부유사의 저감효율은 52.9~65.5%(평균 60.8%)로 조사되었다. 또한 월류수 저감장치의 효율은 중층에서 평균 62.6%로 가장 높은 효율을 보였다. 본 연구의 부유사 관측 결과만으로 월류수 저감장치의 부유사 저감효율을 산정하기에는 다소 무리가 있으나, 관측 결과 나타난 월류수 저감장치의 부유사 저감효과는 비교적 양호한 것으로 조사되었다. 또한 월류수 저감장치는 해사채취시 부유사 저감에 효과적인 방법으로 판단되며, 추후 월류수 저감장치 여과망의 여과효율 등 여러 인자들과의 상호 연관성을 종합적으로 고려하여 해사채취 선박에 설치된 월류수 저감장치의 효율을 도출할 예정이며 해사채취 대상해역의 정기적이고 세밀한 연구가 필요하리라 판단된다.

• Tuberculosis and Respiratory Diseases
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• v.55 no.6
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• pp.623-630
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• 2003

Microscopic polyangiitis is a systemic small-vessel vasculitis that is primarily associated with necrotizing glomerulonephritis and pulmonary capillaritis. Lung involvement is characterized by a diffuse alveolar hemorrhage. However, rarely central nervous system involvement has been reported to be occurred with the microscopic polyangiitis. Relapse of microscopic polyangiitis are reported to be more frequent than those of polyarteritis nodosa, often after a reduction or discontinuation of the therapy. We would like to report two patients with microscopic polyangiitis. One presented with clinical manifestations of both lung and central nervous system involvements and the other was a case of recurrence during steroid tapering following the steroid pulse therapy.

• Journal of the Korean Society of Marine Environment & Safety
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• v.19 no.1
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• pp.66-70
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• 2013

The input current of three phase rectifier which is mainly used in the propulsion system of the electric propulsion ship includes a variety of low order harmonics. To reduce these harmonics, the power conversion system, used in the large vessels which high power is required, is currently used the rectifiers of 12-pulse output, but it still has a problem that occurs $12{\pm}1$ harmonics. Also, in the case of the direct torque control technique which is widely used for the speed and torque control, the torque ripple is severe and the input current of motor has greatly included harmonics by the switching of the inverter. In order to reduce harmonics and improve the performance of torque control, this paper presents that the auxiliary supply assisted into the 12-pulse rectifier of the electric propulsion system using direct torque control technique. We confirm the validity of the proposed method through the simulation under the environment of a real vessel system.

• Journal of the Society of Naval Architects of Korea
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• v.57 no.4
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• pp.241-253
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• 2020

The Small-Unit Riverine Craft (SURC) is a small high-speed vessel used by navies and marine corps in relatively shallow waterway environments, such as riverine areas or littoral coasts. In the past, SURCs have primarily been rigid-hulled inflatable boats constructed using composite materials such as glass fiber reinforced plastics. More recently, single-hull SURCs have been manufactured using aluminum for weight reduction. In this study, a Carbon Fiber Reinforced Polymer (CFRP) material was applied instead to examine its feasibility in the basic design of an SURC with a hull length of 10 m. The CFRP structural design was obtained using the properties of a marine CFRP laminate, determined in a previous study. Next, the designed CFRP SURC was modeled to confirm its functionality, then compared with existing aluminum SURCs, indicating that the CFRP SURC was 41.49 % lighter, reduced fuel consumption by 30 %, and could sail 50 NM further for every hour of engine operation. A method for reducing the high cost of carbon fiber was also proposed based on the adjustment of the carbon fiber content to provide the optimum strength where required. The data developed in this study can be used as a basis for further design of CFRP craft.

• Journal of the Institute of Convergence Signal Processing
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• v.9 no.1
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• pp.10-17
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• 2008

The purpose of this thesis is to reduce of error for source location through acoustic emission(AE) signal, generated elastic wave from crack growth to leak for facility diagnosis. Especially, in order to overcome noise from original signal, this paper proposed enhancement of source location by using noise reduction based on wavelet transform. To evaluate actual performance in experiments, Pencil Lead Break is used crack signal source on the aluminum plate and drain valve of air compressor is used as substitute pressure vessel to generate leak signal. In signal processing, wavelet shrinkage and soft threshold are used to discriminate signal source and then source location techniques have been effectively used with group velocity using material property and time difference between sensor using cross correlation. Source location for crack and leak test have some difference, but the result show that improved 30% with a average length within 10.46mm in crack test and improved 2% compare with average filter in leak test when we applied wavelet transform.

• International Journal of Ocean Engineering and Technology Speciallssue:Selected Papers
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• v.5 no.1
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• pp.22-28
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• 2002

A New concept for the LNG-FPSO ship, with moonpool and bilge step in bottom, is proposed. This concept is investigated with regard to motion reduction and sloshing phenomena of the cargo and operation tanks. The principal dimensions of the ship are $L\timesb B\times D\times t(design)=270.0\times51.0\times32.32\times13.7(m)$, with a total cargo capacity of 161KT; a 98% loading condition is considered for this study. The moonpools and rectangular step at the bilge have been designed for the purpose of decreasing the motion within the tank. For the motion analysis, linearized three-dimensional diffraction theory, with the simplified boundary condition was used. The six-degree of freedom coupled motion responses were calculated for the LNG-FPSO ship. Viscous effects on the roll motion responses of a vessel were taken into account in this calculation program, using an empirical formula suggested by Himeno(1981). The case study for the moonpool size has been conducted using theoretical estimation and the experimental method. For the optimization of the moonpool size and effect of the bilge step, 9 cases of its size, both with and without bilge step, were involved in the study. no motion responses, especially roll motion, for the designed LNG-FPSO ships are much lower than those of other drill ships and shuttle tankers. The limit criterions are satisfied. To check the cargo tank and operation tank sizes, we performed a sloshing analysis in the irregular waves which focuses on the pressure distribution on the tank wall and the time history of pressure and free surface for No.2 and 5 tanks of LNG-FPSO with chamfers. Finally, optimum tank sire was estimated.