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Sung-Jae Kim,Jang-Ho Jay Kim,Seong-Tae Yi,Norhazilan Bin Md Noor,Sung-Chul Kim 한국콘크리트학회 2016 International Journal of Concrete Structures and M Vol.10 No.3
Recently, advanced transit systems are being constructed to reduce traffic congestions in metropolitan areas. For these projects, curved bridges with various curvatures are required. Many curved bridges in the past were constructed using aesthetically unpleasant straight beams with curved slabs or expensive curved steel box girders with curved slabs. Therefore, many recent studies have been performed to develop less expensive and very safe precast prestressed concrete (PSC) curved girder. One method of reducing the construction cost of a PSC curved girder is to use a reusable formwork that can easily be adjusted to change the curvature and length of a girder. A reusable and curvature/dimension adjustable formwork called Multi-tasking formwork is developed for constructing efficient precast PSC curved girders. With the Multi-tasking formwork, two 40 m precast PSC box girders with different curvatures were constructed to build a two-girder curved bridge for a static flexural test to evaluate its safety and serviceability performance. The static flexural test results showed that the initial cracking load was 1400 kN, exceeding the design cracking load of 450 kN. Also, the code allowed deflection of 50 mm occurred at a load of 1800 kN, verifying the safety and serviceability of the precast PSC curved bridge constructed using the multi-tasking formwork.
Tae Gyun Kim,Hoon Hur,Chang Wook Ahn,Yi Xuan,Yong Kwan Cho,Sang-Uk Han 대한위암학회 2011 Journal of gastric cancer Vol.11 No.4
Purpose: The Roux en Y method has rarely been performed due to longer operation time and high risk of complication, despite several merits including prevention of bile reflux. We conducted a retrospective review of the result of Roux en Y reconstruction using two circular staplers after subtotal gastrectomy. Materials and Methods: From December 2008 to May 2009, a total of 26 patients underwent Roux en Y reconstruction using two circular staplers after subtotal gastrectomy, and seventy-two patients underwent Billroth-I reconstruction. Roux en Y anastomosis was performed using two circular staplers without hand sewing anastomosis. We compared clinicopathologic features and surgical outcomes between the two groups. All patients underwent gastrofiberscopy between six and twelve months after surgery to compare the bile reflux. Results: No significant differences in clinicopathologic findings were observed between the two groups, except for the rate of minimal invasive surgery (P=0.004) and cancer stage (P=0.002). No differences in the rate of morbidity (P=0.353) and admission duration (P=0.391) were observed between the two groups. Gastrofiberscopic findings showed a significant reduction of bile reflux in the remnant stomach in the Roux en Y group (P=0.019). Conclusions: When compared with Billroth-I reconstruction, Roux en Y reconstruction using the double stapler technique was found to reduce bile reflux in the remnant stomach without increasing postoperative morbidity. Based on these results, we planned to begin a randomized controlled clinical trial for comparison of Roux en Y reconstruction using this method with Billroth-I anastomosis.
Nutritional Status of Children with Cerebral Palsy
Tae Im Yi,Won Seok Huh,Hye Kyung Ku,In Seok Seo,Jae Won Shim,이가은,Joo Sup Kim,Jun Sung Park 대한재활의학회 2011 Annals of Rehabilitation Medicine Vol.35 No.1
Objective To determine the nutritional status of children with cerebral palsy (CP) and to compare their anthropometric and functional indices. Method Seventy children with cerebral palsy, were at class I (12), II (17), III (18), IV (9) and V (14) on Gross Motor Function Classification System (GMFCS). They varied by age from 25 to 130 months with a mean of 48 months, and consisted of spastic diplegic cerebral palsy (30), quadriplegia (28), triplegia (3), hemiplegia (4), athetoid (4) and hypotonia (1). Evaluation of weight, height, subcutaneous fat thickness, brachial circumference, Body Mass Index (BMI), level of albumin, lymphocyte and blood ferritn were conducted. To identify the factors affecting nutritional status, dietary status and symptoms of dysphagia were investigated. Results Low BMI percentile was in 23 children (32.9%) and obese condition in 3 children (4.3%). Low BMI percentile tends to frequently observed in groups III, IV, V of GMFCS. BMI percentile with subcutaneous fat thickness, Gross Motor Function Measure (GMFM) score were significantly related (p<0.05). Seen from the symptom of dysphagia, low BMI percentile was correlated with decreased tongue motion (p<0.05). Conclusion Cerebral palsy children with lower GMFM score, decreased tongue motion were significantly related with low BMI percentile. Subcutaneous fat thickness can be useful tool for evaluation of malnutrition of cerebral palsy children.
Tae Woo Lim,Sang Hu Park,Dong-Yol Yang,Shin Wook Yi,Hong Jin Kong,Kwang-Sup Lee 대한기계학회 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.11S
A Contour Offset Algorithm (COA) has been developed to fabricate nano-precision figures or patterns in the range of several microns by a nano-Replication Printing (nRP) process. In the nRP process, a femtosecond laser illuminated on photosensitive monomer resin to induce polymerization of the liquid monomer according to a volume pixel (voxel) matrix which is transformed from a two-tone (black and white) bitmap file. After two-photon absorbed photopolymerization (TPP), a droplet of ethanol is dropt on a glass plate to remove the unnecessary remaining liquid resin, leaving only polymerized patterns on the glass plate. In the nRP process, the replicated patterns do not precisely coincide with the initial designs due to an essential shortage of nRP process. Fabricated patterns by means of the nRP process become larger than the design in the amount of the voxel radius. In this work, an outer contour matrix of an initial design was constructed and reduced according to an offset-ratio calculated by the COA in order to obtain more precise patterns. Both the effectiveness and the accuracy of the proposed algorithm were demonstrated through chosen example.
Tae-Sung Kwon,Young-Kyu Park,Byung-Woo Kim,Young-Seuk Park,Joo-Hoon Lim,Hyun Jung Kim,Hoonbok Yi 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
We've collected litter-dwelling predatory arthropods (spiders and carabid beetles) by using pitfall traps at four different fire intensity treatment areas (control, ground fire, canopy fire, and canopy fire with plantation) at four different regional areas in 2005. We analyzed the arthropod community structures with PC-Ord for the difference of arthropod community among the various fire intensity treatments and control. Our objective was to verify if there was any difference between fired areas and non fired area (control) and between canopy fire with plantation and canopy fire without plantation. From our arthropod community structures, we found there was distinct community composition difference between fired areas and non-fired area as well as between control and canopy fire treatment with plantation or non-plantation. However, we are not sure yet that there was any distinct difference between control and ground fire treatments. Our results from the multivariate analysis, Non-parametric Multidimensional Scaling ordination, could be relatively conclude that the main difference of arthropod community between fired areas and non-fired areal and canopy fire with plantation or non-plantation was caused from the difference of arthropod habitat pattern such as litter depth, litter volumem, CWD cover or volume, and et. al. When we compared to control and other treatments, we could also conclude that the canopy fire treatment with non-plantation was relatively closed to control than the canopy fire treatment with plantation.