• Advances in pediatric surgery
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• v.4 no.2
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• pp.156-162
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• 1998

Choledochal cyst is rare in the western countries, but common in oriental countries. Complicatioins include ascending cholangitis, recurrent pancreatities, progressive biliary cirrhosis, portal hypertension, stone formation and later malignant transformation. Bile peritonitis secondary to rupture is one of the rarest complications, with an incidence of 1.8 % to 18 %. The anomalous arrangement of the pancreatobiliary ductal system with a long common channel may cause inflammation leading to perforation of the cyst. The authors found 4 cases (14.2 %) of bile peritonitis among 28 cases of choledochal cyst treated from Jan. 1983 to Jan. 1998. The patients ages ranged from 6 months to 3 years and three were female. The perforation sites were located on the common bile duct at its junction with the cystic duct in 2 cases, the distal cyst wall in 1 case and the left hepatic duct at its junction with cyst in 1 case. The types of choledochal cysts by Todani's classification were Type IVa in 3 cases and type I in 1 case. By the new Komi's classification utilizing operative cholangiogram there were 2 cases of Type Ia, 1 case of type IIb and 1 case of type III. One stage cyst excision and hepaticojejunostomy(Roux-en Y type) was done in 3 cases, and two staged operation in 1 case. All patients had an uneventful course postoperatively. The average day of discharge was 9.8th postoperatively. In conclusion, primary excision of the choledochal cyst and biliary reconstruction is a safe and effective treatment of ruptured choledochal cyst in infants.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.1859-1864
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• 2004

An effective methodology is reported for the optimal design of multisite batch production/transportation and storage networks under uncertain demand forecasting. We assume that any given storage unit can store one material type which can be purchased from suppliers, internally produced, internally consumed, transported to or from other plant sites and/or sold to customers. We further assume that a storage unit is connected to all processing and transportation stages that consume/produce or move the material to which that storage unit is dedicated. Each processing stage transforms a set of feedstock materials or intermediates into a set of products with constant conversion factors. A batch transportation process can transfer one material or multiple materials at once between plant sites. The objective for optimization is to minimize the probability averaged total cost composed of raw material procurement, processing setup, transportation setup and inventory holding costs as well as the capital costs of processing stages and storage units. A novel production and inventory analysis formulation, the PSW(Periodic Square Wave) model, provides useful expressions for the upper/lower bounds and average level of the storage inventory. The expressions for the Kuhn-Tucker conditions of the optimization problem can be reduced to two sub-problems. The first yields analytical solutions for determining lot sizes while the second is a separable concave minimization network flow subproblem whose solution yields the average material flow rates through the networks for the given demand forecast scenario. The result of this study will contribute to the optimal design and operation of large-scale supply chain system.

• Archives of Reconstructive Microsurgery
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• v.10 no.1
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• pp.34-37
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• 2001

The injury on the dorsum of foot is usually manifested in the defect of bone and soft tissue, so its reconstruction requires composite tissue. Free flap satisfies this defect but its indication is determined by the defect size, recipient status and so on. Iliac crest bone and fibular bone are useful bone flap but in more than 8cm defect, fibular flap is more useful. The drawback of fibular free flap is the absence of soft-tissue coverage, so another local flap and myocutaneous flap must be added. Fibula-hemisoleus ostemusculocutaneous free flap has been used for the reconstruction of upper and lower extremity. Its advantages are one stage operation, one donor site and the flexibility of the reconstruction with the use of muscle, bone, and skin. This flap has never been reported for the reconstruction of dorsum of foot. In our case, 20-year-old woman was referred with the 17 cm defect of 1st metatarsal bone and $16{\times}8cm$ sized soft tissue loss on the dorsum of the right foot. We reconstructed successfully the dorsum of foot with fibula-hemisoleus osteomusculocutaneous free flap and the patient can walk without crutches after 6 monthes.

• New & Renewable Energy
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• v.10 no.3
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• pp.47-54
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• 2014

Recently, BESS is considered as one of essential countermeasure for demand side management. However, an economic evaluation is critical issue for the introduction of power system because the cost of BESS is very high in present stage. Therefor, this paper presents economic evaluation method for customer use case by considering peak shaving function based on the real time price. From the case study on the model power system and educational customer, it is confirmed that the proposed method is a practical tool for the economic analysis of BESS. and analytical approach for the reliability assessment in radially operated distribution systems. The approach can estimate the expected reliability performance of distribution systems by a direct assessment of the configuration of the systems using the reliability indexes such as NDP (Non-Delivery Power) and NDE (Non-Delivery Energy). The indexes can only consider the number and configuration of the load, but can not consider the characteristics of the load which is the one of the most important factor in the investment cost for the distribution systems. Therefore, this paper presents the new performance indexes for the investment of the distribution facilities considering both the expected interruption cost for the load section and the operation characteristics of Energy Storage System. The results from a case study show that the proposed methods can be a practical tool for the reliability management in distribution systems including Energy Storage System.

• Journal of Chest Surgery
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• v.32 no.7
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• pp.675-680
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• 1999

We describe here two cases of anterior tracheoplasty utilizing an autologous pericardial patch. One patient was a 9 year-old female who had a congenital long tracheal stenosis associated with major vascular anomalies including pulmonary artery sling. One-stage correction was done under the support of an extracorporeal membrane oxygenation system. She required a prolonged ventilation support for 10 days postoperatively until the implanted pericardium was fixed to the mediastinal structures. The other patient was a 8 year-old male who had acquired tracheal stenosis following a complicated tracheostomy. By applying additional support over the pericardial patch with the costal cartilage, an endotracheal tube could be removed immediately after the operation. Both patients have been doing well in a postoperative follow-up of over a year, and there have been evidences of growth in the reconstructed trachea.

• Journal of The Korean Society of Agricultural Engineers
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• v.46 no.5
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• pp.141-153
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• 2004

Wetland system is widely accepted as one of natural water purification systems around the world for nonpoint sources pollution control. Constructed wetlands have become a popular technology for treating contaminated surface and waste water. In this study, the field experiment to reduce nonpoint source pollution loadings from polluted stream waters using wetland system was performed from June 2002 to March 2004. Four wetlands were used and the size of each one was 0.8ha. Water of Dangjin stream flowing into Seokmun estuarine reservoir was pumped into wetlands. Inflow and hydraulic residence time of the system was 500 $m^3$/day∼1,500 $m^3$/day, 2∼5 days, respectively. After 2 year operation, plant-coverage of the wetlauds was about 70% from bare soil surface at initial stage . Average water quality of the influent was $BOD_5$ 4.17 mg/L, TSS 18.45 mg/L, T-N 4.32 mg/L, and T-P 0.30 mg/L. The average removal rate of $BOD_5$, TSS, T-N and T-P during the study period was 5.6%, 46.6%, 45.7%, and 54.8%, respectively. Organic ($BOD_5$) removal rate was low and the reason might be low influent concentration. Wetland removal rate of T-P was about 10% higher than T-N. Performance of the experimental system was compared with existing data base (NADB), and it was within the range of general system performance. Overall, the wetland system was found to be adequate for treating polluted water stream with stable removal efficiency even during the winter period. Most of the nonpoint source pollutions from watershed are transported by streams or ditches, and they could be controled by constructed wetland system before entering the lake or reservoir.

• Korean Institute of Interior Design Journal
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• no.1
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• pp.39-45
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• 1992

Today the design is recognized as indispensible part in business activities and it is demanded as one of the management strategies. since the ultimate goal of a hotel lines in the pursuit of profit, it is important that the design of a hotel faithfuly reflects the demands of management at the time of its construction planning. Furthermore, hotel planning undergoes a complicated design phases on a large scale, thus, utilization of a design process that accomodates retional approaches scientific and structural design activities, which will further reduce errors in design steps and pave a way for effective attainment of the target. Especially the management and designers review and confirm the design in relation to the strategic manegiable objective sat the early basic stage. The baseline set here will serve as a direction for the detailed design. In this context, this thesis formulates a reference baseline in dividing the space in view of the overall profitability and is based upon a survey conducted on the correlation between the operation of food and beverage section and the space. First, downtown hotels now take on the role of a public facility to a great extent and the number of Koreans who visit the autxiliary facilities of hotel increases. Second, recently revenue from a food and beverage section is in downtown and the trend is especially obrious at western restaurant, buffet and bar. This necessitates the reevaluation of the business space allocation. Third, sales promotion plan includes diversification, dessection and scaling down of the food and beverage section areas, Fourth, a proper number of seats must be determined in regard to the average area of one seat shown in the survey. Fifth, dense seat arrangement would entail a curtailment rather than a hike in revenue. Sixth, the installation of private dining room is on the rise and in particular, in Japanese and Chinese restaurants. Seventh, business space with declined revenue tends to induce the integration of similar businesses.

• Archives of Craniofacial Surgery
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• v.19 no.2
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• pp.148-151
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• 2018

The nose is an important landmark of the face and its shape and beauty is of significant concern. The columella is the subunit between the two nostrils that provides support and projection to the nasal tip and has functional role in nostrils, as well as aesthetic. Ethiology for columellar absence or deficiency is diverse, and it is one of the most complex nasal subunits to reconstruct because of its narrow horizontal dimension, its tenuous vascularity and limited availability of adjacent tissue. We present a patient with columellar, membranous septum and upper lip defect, due to oncological resection. The lip reconstruction was designed using advancement of two upper lip edges with the technique of webster perialar/nasocheek advancement. However, the perialar/nasocheek tissue which is usually discarded was used as inferiorly based skin flaps to reconstruct the membranous septum, columellar skin and nasal vestibule lining. Rib cage cartilage graft was used as columellar strut for support. At 1-year follow-up, the patient has good nasal contour and projection. Scaring of the columella is very subtle. This is a versatile way for successful reconstruction of a columella and large central facial defect in one-stage operation. It is a method which provides very satisfactory aesthetic result with minimum patient morbidity and discomfort.

• Journal of Institute of Control, Robotics and Systems
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• v.10 no.6
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• pp.537-544
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• 2004

An effective methodology is reported for determining the optimal lot size of batch processing and storage networks which include uncertain demand forecasting. We assume that any given storage unit can store one material type which can be purchased from suppliers, internally produced, infernally consumed, transported to or from other sites and/or sold to customers. We further assume that a storage unit is connected to all processing and transportation stages that consume/produce or move the material to which that storage unit is dedicated. Each processing stage transforms a set of feedstock materials or intermediates into a set of products with constant conversion factors. A batch transportation process can transfer one material or multiple materials at once between sites. The objective for optimization is to minimize the probability averaged total cost composed of raw material procurement, processing setup, transportation setup and inventory holding costs as well as the capital costs of processing stages and storage units. A novel production and inventory analysis formulation, the PSW(Periodic Square Wave) model, provides useful expressions for the upper/lower bounds and average level of the storage inventory. The expressions for the Kuhn-Tucker conditions of the optimization problem can be reduced to two sub-problems. The first yields analytical solutions for determining lot sires while the second is a separable concave minimization network flow subproblem whose solution yields the average material flow rates through the networks for the given demand forecast scenario. The result of this study will contribute to the optimal design and operation of the global supply chain.

• Archives of Plastic Surgery
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• v.34 no.3
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• pp.399-402
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• 2007

Purpose: Arteriovenous fistula is one of high flow vascular malformations. Recently, arteriovenous fistula has been regarded as one of the type of arteriovenous malformations. The patients were diagnosed as arteriovenous malformation Schobinger clinical stage II. Even though arteriovenous fistula rarely occurs on head and neck, treatment of that is difficult due to frequent recurrence. In treating the arteriovenous fistula, chemical embolization, surgical excision and other treatment modalities were used, but the results were not satisfactory. The authors experienced three cases of arteriovenous fistula and treated them with surgical excision. Methods: In cases, warmth, enlargement, pulsation, thrill, and bruit were found. For the accurate evaluation before the operation, angiography and MRI were checked in advance. Incision was made on the site of pulsation. The artery and vein connected to the arteriovenous fistula were dissected widely, individually ligated, and divided. And then the entire mass was totally removed. Results: All surgical sites were healed well without complications and there was no evidence of recurrence in all cases up to for 2 years of follow-up examination. Conclusion: The arteriovenous fistula on face is a very rare disease and has difficulties in treatment. The authors experienced three cases of arteriovenous fistula with complete surgical removal and no recurrence was found in all cases.