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조립질 화강암지반의 발파진동 추정식 산정에 관한 실험적 연구
오치현,송혁,김선우 대한건축학회 2004 대한건축학회논문집 Vol.20 No.3
Ground vibration can cause physical damage to existing buildings and be the reason of huge accident. It is different the characteristics of ground vibration depending on field condition, which makes it difficult to prevent accident. Therefore, it is necessary to establish the prevention plan to minimize the damage by generating the vibration below the limitation. From this point of view, the blasting job could be carried out through blasting pattern design and control. This study aims to determine the prediction equation for blasting appropriate for the constructive granite ground by measuring and analysing the blasting data of 2,148 times and the results can be applied for the blasting in the same ground type. For blasting vibration prediction equation for a soft rock ground(single axis compression strength 235∼282 Kg/㎠), it was analysed that using the cube root conversion formula favored within 60m and using the square root conversion formula favored after 62m. for blasting vibration prediction equation for a normal rock ground(single axis compression strength 906∼1047 Kg/㎠), it was analysed that using the cube root conversion formula favored within 64m and using the square root conversion formula favored after 66m.
( Chi Hyuk Oh ),( Seok Ho Dong ) 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.2
The most effective and the standard treatment for bile duct stones (BDSs) is endoscopic retrograde cholangiopancreatography (ERCP). However, in 10% to 15% of patients with BDSs, the stones cannot be removed by conventional ERCP, which involves endoscopic sphincterotomy followed by balloon or basket extraction. Additional techniques or devices are often necessary to remove these difficult bile-duct stones, including endoscopic papillary large balloon dilatation to make a larger papillary opening and/or mechanical lithotripsy to fragment the stones. Advances in cholangioscopy have made possible electrohydraulic or laser lithotripsy under direct cholangioscopic visualization during ERCP. Cholangioscopy-guided lithotripsy could be another good option in the armamentarium of techniques for removing difficult BDSs. Here we review endoscopic techniques based on single-operator cholangioscopy for the management of difficult BDSs.
Benefits of Flavored Lactose-Free Milk for Korean Adults with Lactose Intolerance
Chi Hyuk Oh,Jung Wook Kim,Yoo Min Park,Gi-Ae Kim,Jae-Young Jang,Young Woon Chang,Jin Oh Yang,Ho Young Kho,Jun-Kyu Park 한국식품영양과학회 2022 Journal of medicinal food Vol.25 No.10
Although lactose-free dairy products for the clinical management of lactose intolerance (LI) are widely available, scientific evidence on their efficacy is still lacking. This study comparatively analyzed the efficacy of flavored lactose-free milk (LFM) and whole milk (WM) in reducing symptoms in South Korean adults with LI. This prospective study was conducted in adults suspected of LI. All screened participants underwent the hydrogen breath test (HBT) using 570 mL of chocolate-flavored WM (20 g of lactose) and responded to a symptom questionnaire. LI was confirmed when the ΔH2 peak exceeded 16 ppm above baseline values and with the occurrence of symptoms after WM consumption. The participants who were diagnosed with LI underwent the HBT again with 570 mL of chocolate-flavored LFM (0 g of lactose), followed by the symptom questionnaire survey after 1 week. After excluding 40 participants who did not meet the diagnostic criteria for LI and 2 who were lost to follow-up, a total of 28 lactose-intolerant individuals were enrolled in the study. The ΔH2 values in the first HBT were significantly higher than those in the second HBT (33.3 ± 21.6 ppm vs. 8.6 ± 6.3 ppm, P < .001). Similarly, there was a significant reduction in the total symptom score in the second HBT (4.18 ± 1.51 vs. 0.61 ± 0.98, P < .001). Flavored LFM is well tolerated in South Korean adults diagnosed with LI based on the HBT and symptom questionnaire results. Therefore, LFM may be a viable alternative to WM.
Clinical Practice Guidelines for the Endoscopic Management of Peripancreatic Fluid Collections
Chi Hyuk Oh,이준규,Tae Jun Song,Jin-Seok Park,Jae Min Lee,Jun Hyuk Son,Dong Kee Jang,Miyoung Choi,Jeong-Sik Byeon,In Seok Lee,Soo Teik Lee,Ho Soon Choi,Ho Gak Kim,Hoon Jai Chun,Chan Guk Park,Joo Young Ch 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.4
Endoscopic ultrasonography-guided intervention has gradually become a standard treatment for peripancreatic fluid collections(PFCs). However, it is difficult to popularize the procedure in Korea because of restrictions on insurance claims regarding the use ofendoscopic accessories, as well as the lack of standardized Korean clinical practice guidelines. The Korean Society of GastrointestinalEndoscopy (KSGE) appointed a Task Force to develope medical guidelines by referring to the manual for clinical practice guidelinesdevelopment prepared by the National Evidence-Based Healthcare Collaborating Agency. Previous studies on PFCs were searched,and certain studies were selected with the help of experts. Then, a set of key questions was selected, and treatment guidelines weresystematically reviewed. Answers to these questions and recommendations were selected via peer review. This guideline discussesendoscopic management of PFCs and makes recommendations on Indications for the procedure, pre-procedural preparations,optimal approach for drainage, procedural considerations (e.g., types of stent, advantages and disadvantages of plastic and metalstents, and accessories), adverse events of endoscopic intervention, and procedural quality issues. This guideline was reviewed byexternal experts and suggests best practices recommended based on the evidence available at the time of preparation. This will berevised as necessary to address advances and changes in technology and evidence obtained in clinical practice and future studies.
Chi Hyuk Oh,Byoung Kwan Son 대한내과학회 2022 The Korean Journal of Internal Medicine Vol.37 No.6
Fluoroscopy is used frequently during endoscopic procedures, such as endoscopic retrograde cholangiopancreatography (ERCP). However, exposure to radiation is an important health concern, primarily because of the potential increase in the lifetime risk of malignancy. This consideration is important for patients and staff exposed to radiation during ERCP. Thus, an understanding of how radiation doses are measured during ERCP and the potential risks of this radiation is important. Additionally, staff must be educated about methods used to minimize the radiation dose, such as the use of different imaging techniques, the general principles of fluoroscopy, and advances in hardware and software. The use of personal protective equipment is also essential to minimize occupational exposure. However, no comprehensive ERCP guideline on the use of X-ray systems in clinical settings or on radiation protection for operators has been established. This review focuses on the properties of fluoroscopy systems and methods of radiation protection for physicians and assistants participating in ERCP.
Clinical Practice Guidelines for the Endoscopic Management of Peripancreatic Fluid Collections
( Chi Hyuk Oh ),( Tae Jun Song ),( Jun Kyu Lee ),( Jin-seok Park ),( Jae Min Lee ),( Jun Hyuk Son ),( Dong Kee Jang ),( Miyoung Choi ),( Jeong-sik Byeon ),( In Seok Lee ),( Soo Teik Lee ),( Ho Soon Ch 대한소화기학회 2021 Gut and Liver Vol.15 No.5
Endoscopic ultrasonography-guided intervention has gradually become a standard treatment for peripancreatic fluid collections (PFCs). However, it is difficult to popularize the procedure in Korea because of restrictions on insurance claims regarding the use of endoscopic accessories, as well as the lack of standardized Korean clinical practice guidelines. The Korean Society of Gastrointestinal Endoscopy appointed a Task Force to develop medical guidelines by referring to the manual for clinical practice guidelines development prepared by the National Evidence-Based Healthcare Collaborating Agency. Previous studies on PFCs were searched, and certain studies were selected with the help of experts. Then, a set of key questions was selected, and treatment guidelines were systematically reviewed. Answers to these questions and recommendations were selected via peer review. This guideline discusses endoscopic management of PFCs and makes recommendations on Indications for the procedure, pre-procedural preparations, optimal approach for drainage, procedural considerations (e.g., types of stent, advantages and disadvantages of plastic and metal stents, and accessories), adverse events of endoscopic intervention, and procedural quality issues. This guideline was reviewed by external experts and suggests best practices recommended based on the evidence available at the time of preparation. This will be revised as necessary to address advances and changes in technology and evidence obtained in clinical practice and future studies. (Gut Liver 2021;15:677-693)
증례 : 순화기 ; 건강한 성인에서 인플루엔자 A (H1N1)에 감염에 의해 발생한 급성 심장막염 1예
오치혁 ( Chi Hyuk Oh ),김진배 ( Jin Bae Kim ),김유진 ( Yu Jin Kim ),이태인 ( Taein Lee ),변종규 ( Jong Kyu Byun ),김권삼 ( Kwon Sam Kim ),김우식 ( Woo Shik Kim ) 대한내과학회 2014 대한내과학회지 Vol.87 No.4
A 21.year.old male with no any other diseases presented with fever, chills, and chest discomfort. A chest radiography scan and transthoracic echocardiogram revealed a large amount of pericardial effusion. An H1N1 viral real.time PCR test confirmed the presence of H1N1 viral infection. Pericardiocentesis was performed to reduce symptoms, and oseltamivir (Tamiflu TM ) was administered. His symptoms improved during the first 4 days, and there was no relapse of the pericardial effusion. The most common manifestation of influenza A infection is respiratory tract infection. Although a cardiovascular manifestation is possible, it is extremely rare. We have reported here a case of acute pericarditis with a large amount of pericardial effusion in a healthy adult infected with influenza A virus (H1N1, swine.origin). (Korean J Med 2014;87:461-465)
2개의 서로 다른 부전도로를 가진 비후성 심근병증 환자를 전극도자 절제술로 치료한 증례
오치혁 ( Chi Hyuk Oh ),김승민 ( Seung Min Kim ),신재령 ( Jae Ryung Shin ),유정선 ( Jung Sun Yoo ),윤경한 ( Kyung Han Yoon ),김진숙 ( Jin Sug Kim ),박지윤 ( Ji Yoon Park ),김슬기 ( Seul Ki Kim ),김진배 ( Jin Bae Kim ) 전북대학교 의과학연구소 2013 全北醫大論文集 Vol.37 No.1
A 41-year-old man, with WPW syndrome and a hypertrophic cardiomyopathy, was admitted for recurrent palpitation. EPS (Electrophysiological study) identified that manifested bypass tract was an innocent bystander, and another concealed bypass tract was utilized as retrograde conduction, during AVRT (atrioventricular reentrant tachycardia). The multiple accessory pathways could be localized at the right free wall and left posteroseptal area. Both of them were successfully abolished with catheter ablation. Successful catheter ablation provides an evident risk reduction, as a result of a lower incidence of AF(atrial fibrillation) and a complete removal of risk for ventricular tachyarrhythmia.
오치혁 ( Chi Hyuk Oh ),동석호 ( Seok Ho Dong ) 대한소화기학회 2015 대한소화기학회지 Vol.66 No.5
Approximately 3-15% of patients who have undergone removal of bile duct stones with endoscopic sphincterotomy have recurrence of stones which often presents as acute cholangitis. Despite better understanding on the factors and mechanisms underlying the recurrence of bile duct stones achieved during the past few decades, endoscopic removal still remains the mainstay of management for recurrent bile duct stones. Recently investigated and suggested management of recurrent bile duct stones are highlighted in this review. (Korean J Gastroenterol 2015;66:251-254)