• Clinical and Experimental Pediatrics
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• v.50 no.7
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• pp.655-659
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• 2007

Purpose : The aim of this study was to document the causes of chronic abdominal pain in children referred to a hospital setting and evaluate the frequency and characteristics of functional gastrointestinal disorder (FGID) classified by Rome III criteria. Methods : One hundred thirty two patients with chronic abdominal pain were evaluated. Examinations were performed in order to find organic causes in patients when organic disease was suspected. Results : Among the 132 patients, 20 patients (15.2%) had organic diseases and 112 patients (84.8%) were diagnosed as having FGIDs. Functional dyspepsia was the most common cause of FGIDs, followed by irritable bowel syndrome. Overlap of some FGIDs was observed in seven patients (5.3%). Conclusion : FGIDs are the main causes of chronic abdominal pain in children and functional dyspepsia was the most prevalent disorder.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.630-636
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• 2020

This study reviewed camouflage techniques to reduce the visual detect-ability of aircraft. Visual camouflage can be defined as the process of making objects less visible. Aircraft visual camouflage delays detection of the aircraft position, speed, and flight direction. Multi-tone and counter-shaded schemes are generally adopted as camouflage patterns for close-air-support aircraft and air-superiority aircraft, respectively. Another study showed that the monotone scheme is also efficient when the hue and brightness of the camouflage color are controlled correctly. Active camouflage techniques for aircraft have been studied to increase the camouflage effectiveness. In particular, counter-illumination techniques using electroluminescence devices can minimize the difference in brightness between the aircraft and sky background. Active camouflage techniques are expected to enhance the survivability of low-altitude UAVs, which are vulnerable to visual detection.

• Clinical and Experimental Pediatrics
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• v.46 no.1
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• pp.6-10
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• 2003

동물과 사람의 연구에서 위장관 영양 인자는 위장관 점막이 점막손상으로부터의 회복에 중요하고 출생 후 경구 영양에 적응할 수 있게 하는 데에 중요하다. 경구적으로든 전신적으로 투여된 성장 인자들은 위장관의 성장과 발달을 촉진시킨다. 신생아 혈중의 영양인자들이 장관 세포의 수용체를 통해 작용하여 위장관의 성장을 조율한다. 위장관 영양인자들은 체내에서 합성될 수도 있고 모유를 통해 공급된다. 사람에서 출생 후 위장관이 장관영양에 신속히 적응할 수 있도록 위장관 영양 인자들이 중요한 작용을 한다. 모유 내의 성장 인자들이 신생아 생존에 필수적인 것들은 않아도 모유를 먹은 영아들이 조제분유를 먹은 영아들에 비하여 급성 설사, 괴사성 장염, 크론씨 병과 같은 위장관 질환의 위험율이 낮다. 위장관 영양 인자들의 대부분이 시판 조제분유에는 존재하지 않고 주로 모유에 존재함을 앎으로써 모유의 장점을 설명하는 데에 적용할 수 있을 것이다. 그리고 위장관 영양인자는 위장관 점막 손상된 경우 치료 목적으로 사용될 수 있는 여지가 높다. 이러한 임상적 이용은 특히 미숙아, 수술 후의 영아 등에서 적용될 수 있다. 그러나 향후 더욱 연구되어야 할 항목들로는 작용기전, 경구 및 정맥 투여 방법에 의한 효과의 차이, 체내 성장 인자들과의 상호 작용, 외부적 투여가 체내 인자에 대한 영향, 위장관 이외의 타 기관에 대한 영향, 그리고 안전성과 약물 역동학적인 특성 등이다.

• Clinical and Experimental Pediatrics
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• v.46 no.6
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• pp.572-575
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• 2003

Purpose : This study was performed to analyze the endoscopic findings in Henoch-Schonlein purpura patients, and to compare the differences in endoscopic findings according to age and gastrointestinal symptoms. Methods : We examined children with Henoch-Schonlein purpura aged 3 to 15 years between September 1996 and October 2002. The total number studied was 65, consisting of 41 boys and 24 girls. Endoscopy was performed and the results were analysed. Results : Among 65 cases, 12 cases of duodenitis, nine cases of gastritis and duodenitis, six cases of duodenal erosion, five cases of gastritis, five cases of duodenal ulcer, two cases of gastric ulcer and one case of colonic erosion were noted. Endoscopic abnormality was found in 38 of 53 who had gastrointestinal symptoms, and in two of 12 who didn't have gastrointestinal symptoms. Conclusion : Most of the gastrointestinal symptoms in Henoch-Schonlein purpura patients were relieved without complication. But in some cases severe symptoms such as hematemesis, melena, and abdominal pain localized to epigastric area were developed when diagnosis was delayed. Prompt endoscopy will be helpful for diagnosis and therapy of Henoch-Schonlein purpura with gastrointestinal involvement.

• Journal of Yeungnam Medical Science
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• v.16 no.2
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• pp.318-325
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• 1999

Background: Anticholinesterase drug inhibits acetylcholinesterase(AChE), induce accumulation of acetylcholine(ACh) near cholinergic receptors and cholinergic stimulation. This experiment was performed to study the effects of anticholinesterase drugs on gastric motility and the effect of ethanol on anticholinesterase drug-induced motility change. Materials and Methods: After excision of stomach, $2{\times}10mm$ circular muscle strips were made, which were then fixed to the isolated muscle chamber. An isometric tension transducer was used to measure the contraction change of the gastric smooth muscle strips after drug addition. Results: Fenthion, an irreversible anticholinesterase drug, increased ACh induced contraction of gastric smooth muscle strips and PAM, a cholinesterase activator, antagonized this action. Physostigmine, a reversible anticholinesterase drug, also increased the ACh induced contraction. The gastric motility was decreased by PAM. Ethanol, which is known to induce smooth muscle relaxation, inhibited the increase of contraction by fenthion. Conclusion: These results indicate that irreversible and reversible anticholinesterase drugs increase gastric motility and antagonized by cholinesterase activating drugs. And when exposed to both ethanol and anticholinesterase drug, gastric motility was decreased by the smooth muscle relaxation effect by ethanol.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.423-424
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• 2020

다양한 환경 변화에 따라 적용 가능한 최적의 위장무늬 개발의 필요성이 증대됨에 따라 위장무늬 성능 평가를 위한 포토시뮬레이션 기술 또한 주목받고 있으나 포토시뮬레이션 저작에 관한 연구는 미비하다. 본 논문에서는 작전환경 이미지 상 위장무늬 이미지의 배치 및 기 배치된 위장무늬의 탐지 시간을 측정하는 소프트웨어인 포토시뮬레이션 기술 개발에 대해 서술한다. 개발된 포토시뮬레이션은 작전환경 및 위장무늬 이미지 로드, 사용자 입력도구를 통한 대상 작전환경 이미지 상 위장무늬 이미지의 배치 및 저작, 저작 된 작전 환경 이미지 상 위장무늬 이미지를 모니터에 출력, 사용자 입력도구를 통한 작전환경 이미지 상 위장무늬 이미지의 탐지 및 탐지 시간 측정 기술을 포함한다. 결과에서는 개발 포토시뮬레이션 기술을 통한 위장무늬 이미지 배치 및 저작, 그리고 위장무늬 이미지의 평균 시간 측정 결과 예시를 보여준다.

• Journal of the Korean Child Neurology Society
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• v.26 no.4
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• pp.233-239
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• 2018

Purpose: Viral gastroenteritis is a common disease in infants and children. Seizures can be associated with viral gastroenteritis as benign convulsions with mild gastroenteritis (CwG). After the development of the rotavirus vaccination, norovirus has become inreasingly significant in children. We retrospectively analyzed the clinical features in a pediatric population presenting with seizures and confirmed enteral viral infections, especially norovirus infections. Methods: We retrospectively reviewed the medical records of pediatric patients aged <15 years admitted due to convulsions and gastroenteritis to the Department of Pediatrics of Myongji Hospital between July 2014 and June 2016. Results: A total of 46 patients (24 male and 22 female) were included. Norovirus was detected in 21 (45.7%) patients, adenovirus in three (6.5%), rotavirus in two (4.3%), astrovirus in one (2.2%), and none of agents were detected in 19 (41.3%) patients. Patients in the norovirus gastroenteritis (NGE) group had a higher incidence of diarrhea than that among in the non-norovirus gastroenteritis (NNGE) group (61.9% vs 28.0%; P<0.05). Twelve patients experienced status epilepticus, including five (23.8%) in the NGE group and seven (33.0%) in the NNGE group (P=0.837). Seizures were effectively terminated by intravenous benzodiazepines in 8 (66.7%) of 12 patients. Additional long-acting antiepileptic drugs such as fosphenytoin or levetiracetam were required in three (25%) of 12 patients. Conclusion: Patients with CwG with and without noroviurs infection did not differ in terms of clinical features. However, status epilepticus was not uncommon among patients with CwG by definition.

• The Journal of the Convergence on Culture Technology
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• v.6 no.4
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• pp.289-294
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• 2020

Peptic ulcer disease is a gastrointestinal disorder caused by Helicobacter pylori infection and the use of nonsteroid anti-inflammatory drugs. While many studies have been conducted to find the risk factors of peptic ulcers, there are no studies on the suggestion of peptic ulcer prediction models for Koreans. Therefore, the purpose of this study is to implement peptic ulcer prediction model using machine learning based on demographic information, obesity information, blood information, and nutritional information for middle-aged and elderly people. For model building, wrapper-based variable selection method and naive Bayes algorithm were used. The classification accuracy of the female prediction model was the area under the receiver operating characteristics curve (AUC) of 0.712, and males showed an AUC of 0.674, which is lower than that of females. These results can be used for prediction and prevention of peptic ulcers in the middle and elderly people.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• v.9 no.2
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• pp.183-192
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• 2006

Purpose: This study was undertaken to evaluate the factors correlated with the clinical course and outcome in patients of Henoch-Sch${\ddot{o}}$nlein Purpura. Methods: The medical records of 104 children diagnosed with Henoch-Sch${\ddot{o}}$nlein Purpura (HSP) from January 1996 to April 2006 were reviewed retrospectively. The patients were divided into two groups: patients with Gastrointestinal (GI) symptoms and those without GI symptoms. When there were joint, scrotum, and renal symptoms except for skin lesion in whole HSP, those patients were excluded. The history of acute infection, duration of admission, treatment requirement, recurrence of HSP, CBC, stool occult blood test, abdominal ultrasonographic findings and GI endoscopic findings were reviewed. Results: Among 104 patients, patients with GI symptoms included 66 cases (63.5%), those without GI symptoms accounted for 38 cases (36.5%). GI symptoms included: abdominal pain in 57 cases (54.8%), vomiting 21 cases (20.2%), GI bleeding 5 cases (4.8%), nausea 3 cases (2.9%) and diarrhea 3 case (2.9%). Positive GI symptoms and GI mucosal lesions on GI endoscopy had a statistically significant correlation with increased admission duration, treatment requirement, recurrence of HSP, and positive stool occult blood. Six cases with small intestinal wall thickening were noted on abdominal ultrasonography. Six cases of hemorrhagic gastritis and hemorrhagic duodenitis, 3 cases of duodenal ulcer, 3 cases of hemorrhagic gastritis and duodenal ulcer, 2 cases of hemorrhagic duodenitis and colitis, and 1 case of colitis were noted on GI endoscopy. Conclusion: These results suggest that GI endoscopic examination may be helpful for the diagnosis and treatment of children with HSP.

• Journal of Gastric Cancer
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• v.5 no.1
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• pp.47-51
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• 2005

Eosinophilic gastroenteritis is a rare clinicopathologic entity of unknown etiology with a variety of digestive symptoms. The pathogenesis is poorly understood. Diagnostic criteria include demonstration of eosinophilic infiltration of the affected bowel wall, lack of evidence of extraintestinal disease, and exclusion of various disorders that could mimic similar conditions. The disease might involve any area of the gastrointestinal tract from the esophagus to the rectum, but the stomach and the proximal small bowel are most commonly affected. The clinical features depend on which layer and site are involved. We report the case of a 59-year-old male patient with a 3-week history of post-prandial vomiting with malnutrition and weight loss. An abdominopelvic CT showed a gastric outlet obstruction with diffuse wall thickening, as with linitis plastica. Three gastrofiberscopic biopsies showed chronic gastritis. We carried out a radical total gastrectomy with D2 lymph node dissection. The pathologic report revealed a mural type eosinophilic gastritis with a marked hypertrophic scar formation at the proper muscle layer. We report this case with a brief review of the literature. (J Korean Gastric Cancer Assoc 2005;5:47-51)