• The Journal of the Convergence on Culture Technology
• /
• v.9 no.6
• /
• pp.519-524
• /
• 2023

The study summarizes the experience of operation in the application of flipped learning to various IT-related liberal arts subjects, and proposes a specific application method. So far, most of the studies have analyzed various strategies and learner responses to flipped learning. Currently, it is the time when teachers, who are the main operators of the flipped learning class, need to study how to provide immediate feedback and application while running the relevant courses. Studies related to this are gradually coming out. In general, most of the studies on sharing reference materials through the results after applying various strategies such as developing the structure of class operation by instructors themselves, combining them with discussion classes, or developing various contents. This study proposes a method to analyze how various strategies can be applied in the subject and obtain results simultaneously with class operation by analyzing unstructured data, which is a survey that can receive immediate feedback.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2009.01a
• /
• pp.498-503
• /
• 2009

As for Hadamard Transform, because the calculation time of this transform is slower than Discrete Cosine Transform (DCT) and Fast Fourier Transform (FFT), the effectiveness and the practicality are insufficient. Then, the computational complexity can be decreased by using the butterfly operation as well as FFT. We composed calculation time of FFT with that of Fast Complex Hadamard Transform by constructing the algorithm of Fast Complex Hadamard Transform. They are indirect conversions using program of complex number calculation, and immediate calculations. We compared calculation time of them with that of FFT. As a result, the reducing the calculation time of the Complex Hadamard Transform is achieved. As for the computational complexity and calculation time, the result that quadrinomial Fast Complex Hadamard Transform that don't use program of complex number calculation decrease more than FFT was obtained.

• Journal of Chest Surgery
• /
• v.14 no.1
• /
• pp.26-32
• /
• 1981

Three cases of tricuspid atresia were treated by Fontan varieties of operation in this department in 1980. The first case was 19 year old girl who underwent Glenn operation at the age of 6 years. Her second operation was done with ASD closure and 16mm Ionescu-Shiley valved conduit insertion between right atrium and main pulmonary artery. The second case was a 5 year old boy who underwent Kreutzer operation successfully utilizing 14mm Ionescu-Shiley va]ved conduit. The above mentioned 2 cases were Type Ib after Keith`s classification, whose immediate postoperative courses were complicated by pleura] effusion [in 2nd case chylothorax] hepatomegaly, and ascites. Those complications were relieved completely by medical treatment and closed thoractomy; Postoperative follow-up up to 11 months and 1 year periods were satisfactory with disappearance of cyanosis and dyspnea. The third case was a 8 year old boy who had complete TGA with TA [Keith`s Type IIb] who underwent Kreutze`s operation utilizing 14mm Ionescu-Shiley valved conduit, he died of low cardiac output Immediately after open heart surgery.

• The korean journal of orthodontics
• /
• v.28 no.4 s.69
• /
• pp.487-498
• /
• 1998

This study was conducted to investigate changes of airway size, tongue and hyoid position following orthognathic surgery in mandibular prognathism, and how they are adapted to new environment in time dependent manner. 37 patients, who had recieved orthognathic surgery, were selected for this study. lateral cephalogram of each patient was taken at preoperation, immediate postoperation, and over 6 month after operation, and were traced and analyzed The findings of this study were as follows : 1. The size of airway was not changed at PNS and Epiglottis level after operation, but it was changed slightly at 2nd cervical vertebra level. 2. The hyoid was moved inferoposteriorly at immediate postoperation, and then it shifted toward preoperative position, but it remained slightly inferoposterior position. The distance from hyoid to genial tubercle decreased continuously. 3. The position of tongue was moved inferoposteriorly at immediate postoperatioa and then it shifted toward preoperation position, but the root of the tongue remained inferoposteriorly. 4. The distance between tongue and hyoid was increased at immediate postoperation and slightly decreased during follow-up period. 5. The change of the mandibular position was not significantly correlated with changes of airway size, hyoid position, tongue morphology and tongue position.

• Journal of Korean Society of Forest Science
• /
• v.110 no.2
• /
• pp.210-216
• /
• 2021

Musculoskeletal disorders affect workers' safety in most industries, and forest operations are classified as a musculoskeletal burden according to the Occupational Safety and Health Act in South Korea. In particular, felling and delimbing operations are mainly conducted by manpower, and then, it is necessary to evaluate ergonomic risk assessment for safety of felling and delimbing workers. Three ergonomic risk assessment methods, such as Ovako Working posture Analysis System (OWAS), Rapid Upper Limb Assessment (RULA), and Rapid Entire Body Assessment (REBA), are available for assessing exposure to risk factors associated with timber harvesting operations. Here, three ergonomic risk assessment methods were applied to examine ergonomic risk assessments in chainsaw felling and delimbing operations. Additionally, exposure to risk factors in each method was analyzed to propose an optimal working posture in felling and delimbing operations. The risk levels of these operations were evaluated to be highest in the RULA method, followed by the OWAS and REBA methods, and most of the exposed working postures were examined with a low-risk level of two and three without requiring any immediate working posture changes. However, two significant working postures, including the bending posture of the waist and leg in felling operation and standing posture on the fallen trees in delimbing operation, were assessed as the high-risk level and needed immediate working posture changes. Low-risk work levels were examined in the squatting posture for felling operation and the straightened posture of the waist and leg for delimbing operation. Moreover, the slope in felling operation and the tree height in delimbing operation significantly affected risk level assessment of working posture. Therefore, our study supports that felling and delimbing workers must operate with low-risk working postures for safety.

• Journal of Chest Surgery
• /
• v.28 no.6
• /
• pp.630-632
• /
• 1995

Bichamber cardiac rupture is less frequent compared to unichamber cardiac rupture. We report a patient who was successfully treated after the diagnosis of penetrating stab wound of both ventricles. The key to improved outcome of management of cardiac trauma lies in the rapid transportation to a general hospital where cardiac surgery is available. Aggressive primary intervention and immediate operation are also major factors.

• Journal of Chest Surgery
• /
• v.16 no.1
• /
• pp.91-96
• /
• 1983

A study was carried out to observe the clinical progress and results after modified Blalock-Taussing shunts on II patients with cyanotic complex heart diseases unsuitable for corrective surgery. The operation was performed by interposing a vascular prosthesis [PTEE] between the left subclavian artery and the left pulmonary artery. Vascular prostheses larger than the diameter of left subclavian artery were selected. The results were as follows: 1. The postoperative courses in 10 patients were uneventful without any complications. One patient died of low cardiac output syndrome immediate postoperatively. 2. The average value of RBC count before operations was 751.2291.68 [xl00]/cubic mm. It was decreased to 588.11 90.45 [xl 0,000]/cubic mm. After the operation. 3. The average value of Hemoglobin before operations was 20.07 3.01 mg/dl. The value was decreased to 15.361.68mg/dl after the operation. 4. The value of Hematocrit before operations was 62.878.89%. The value was decreased to 49.6 5.84% 5. Patency after the shunt operations using PTFE was good for maximal 16 months follow-up period. 6. The physiological impairment like anoxic spells, degree of cyanosis and other clinical symptoms were markedly improved after the shunt operations. Although a longer follow-up seems to be necessary to assess the validity of these shunts, the early results were encouraging.

• The Korean Journal of Pain
• /
• v.8 no.1
• /
• pp.31-36
• /
• 1995

Post-tonsillectomy pain in children is a difficult problem to manage. We examined the effect of 10% aerosol lidocaine for the post-tonsillectomy analgesia. ASA physical status I or II, between five and thirteen years of age were assigned, in a randomized fashion, into two groups. The Group I, 30 patients, received a total dose of 4 mg/kg of ten percent aerosol lidocaine on the tonsillar beds. Lidocaine was administered at the end of the surgical procedure. The Group II, 30 patients, were not sprayed with lidocaine aerosol. The postoperative pain scores were assessed by a "red and white" visual analoge pain scales (VAPS). VAPS values were obtained at one and eight hours after the operation. Values of one hour after the operation in the group I and II were $20.83{\pm}10.01$ and $34.50{\pm}10.53$, values of eight hours after the operation were $17.33{\pm}9.07$ and $23.5{\pm}11.08$. The post-tonsilectomy pains were significantly lower in the group I compared with the group II at one and eight hours after the operation. In conclusion, 4 mg/kg of ten percent aerosol lidocaine applied directly on the tonsillar beds was showen a superior, immediate post-tonsillectomy analgesic technique.

• Journal of Chest Surgery
• /
• v.1 no.1
• /
• pp.53-60
• /
• 1968

Achalasia is a functional disorder of a short segment of the lower esophagus showing obstruction of the esophagogastric junction. Dysphagia. regurgitation and weight loss are outstanding features,however, complicated pulmonary troubles aspiration pneumonitis, bronchiectasis, lung abscess etc. --are sometimes more apparent than the disease entity in children though achalasia is rarely encountered in children. During the period of January, 1961, to May, 1968, the authors experienced 9 cases of achalasia of the esophagus in Chest Surgery Department,N.M.C. 1. Seven of nine were male and four were under 5 years of age. 2. So-called symptoms triad noted in almost every case, and 3 of 4 children showed recurrent attacks of pneumonitis. 3. Chest film showed widened superior mediastinum by dilated esophagus in 6 cases, and pulmonary infiltrations in 3 cases of children. 4. Preoperative diagnosis were achalasia,esophageal stricture by rodent-cidal ingestion and suggestive esophageal cancer in 7 cases,one case and remaining one case. respectively. 5. Modified Heller procedure was performed in all cases with definite diagnosis of achalasia at operation table in misdiagnosed 2 cases. 6. Immediate postoperative complications were 2 cases of wound infection and one case of atelectasis and no operative mortality encountered. 7. Seven of nine showed excellent result of operation, and good in one case. Remaining one case failed relieving obstruction and underwent interposition of ileocolonic segment with excellent result.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.25 no.4
• /
• pp.367-370
• /
• 1999

While oral and maxillofacial surgery such as orthognathic surgery, TMJ surgery is in progress, there always exists a risk of bleeding from maxillary artery, and this perplexes the surgeon in operation. In case of massive bleeding, it is mostly very difficult or even impossible to take an immediate action in order to stop bleeding. Even when hemostasis is possible by applying such methods as the use of local hemostatics, pressing, electrocoagulation or direct ligation, there is a high risk of secondary bleeding. Therefore, in case there is bleeding from maxillary artery, it is the best to restrain bleeding completely either by the ligation of the artery in bleeding in operation fields or by the ligation of the external carotid artery.