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국산 Avana 인공치아와 외국산 ITI 인공치아의 악골조직내 적합성에 관한 비교연구
유재하,이지웅,백성흠,정원균,김종배 大韓顎顔面成形再建外科學會 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.6
The purpose of this article is to confirm the longterm biocompatibility of national Avana implant and international ITI implant in dogs. At the fourth month after extreaction of the mandibular third and fourth premolar in three dog, both implants were inserted using careful atraumatic technique and prosthetic abutments were applied onto the implants in three months. After that, the implants were examined by naked eye and radiographic image every three months during 1 year, for detection of the complications, such as, mobility, bone resorption and wound infection. At 1 year after application of prosthetic abutment, the dogs were sacrificed for the histopathologic analysis by light microscope. The results obtained were as follows; 1. All implants had the ralatively good prognosis without mobility, wound infection and moderate bone resoprtion, in clinical and radiological evaluation during one year. 2. The all histopathologic specimens at one year after application of prosthetic abutment onto the implants showed the distinct osseointegration between implant system and bone, with projection of new bone apposition onto the peri-implant tissue. But Avana implants had the less osseointegration than ITI implants in the cancellous and marrow layer of jaw bone. 3. The all histopathologic specimens at one year after application of prosthetic device showed the firm junction by dense connective tissue pattern between the implant and the gingival portion. But Avana implants had the less firmer junction than ITI implants. 4. The authors confirmed that Avana implant and ITI implant have more higher tissue biocompatibility in dental implantation, but ITI implant has the more osseointegration than the Avana implant.
Jong Gyun Ha,Young Hwii Ko,Yeong Uk Kim 대한요로생식기감염학회 2023 Urogenital Tract Infection Vol.18 No.1
Condyloma acuminatum is a common sexually transmitted disease caused by the human papillomavirus and with a high recurrence rate in the urethra. We report the intraurethral instillation of 5-fluorouracil cream for intraurethral condyloma acuminatum with suprapubic cystostomy after transurethral surgery. A 64-year-old man had gross hematuria for several days. At cystourethroscopy, multiple papillary mass lesions were identified on the entire urethra. Transurethral resection of the urethral masses confirmed the diagnosis of condyloma acuminatum. However, recurrent multiple warts were identified on the whole urethra. After re-surgery, intraurethral instillation of 5-fluorouracil cream with suprapubic cystostomy was achieved to prevent a recurrence. After one year of 5-fluorouracil instillation, there was no recurrence of intraurethral condyloma acuminatum.
The Usability Test Method for Portable Toilet Stability
Shin-Gyun Kim,Jong- Geun Kim,Na-Ra Ha,Jong-Ha Lee 대한인간공학회 2018 대한인간공학회 학술대회논문집 Vol.2018 No.5
Objective: We have researched the actual situations that may arise during the use of the product so that we can determine the direction that the product may fall during use and investigate how much force is applied to the product. In order to use safer products for the users in the production of the products, the data should be used as reference materials in the product design stage. Method: 12 subjects were tested on the moving toilet by using motion analyzer and floor reaction force gauge. The products used in the study were B and H, and the angles applied to the fall test were 30, 45, and 60 degrees, respectively and The subjects applied force until the moving toilet leg raised on the floor reaction force meter was lifted and the applied force was measured at that time. Results: As the angle increases, the force required for tipping increases, it can be seen that the product with the unstable structure of the product falls down even with less force. Conclusion: In the evaluation of usability of the product, we evaluated the evaluation by using the actual moving toilet in the evaluation related to stability. This will be the basis for producing safer products in the production of the products.
A High Efficient Constant-Current Multi-Channel LED Driver
Jong-ha Park,Hoon Kim,Hee-Jun Kim,Gyun Chae,Eui-Byoung Kang 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper presents a high efficient constant-current LED driver. It consists of a 1㎒ synchronous boost DC-DC converter and constant current control circuit. The proposed circuit is verified by using HSPICE with 0.35㎛ standard CMOS parameters. The proposed circuit has a simple structure. It can also simplify the PCB level design, by removing the external current sensing resistors.
A 1㎒ High Efficient, Two-Stage Interleaved Synchronous Buck CMOS DC-DC Converter
Jong-Ha Park,Hoon Kim,Hee-Jun Kim,Gyun Chae 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper presents a high efficient 3.3 ? 1V two-stage interleaved synchronous buck CMOS DC-DC converter designed with standard CMOS 0.35㎛ process parameter. The proposed circuit has a low output voltage ripple. To reduce the output voltage ripple, the duty cycle of the interleaved converter is fixed as D=0.5 by an input stage buck converter. It causes the best ripple cancelation of the output current ripple. The proposed circuit was simulated by HSPICE and the simulation results show that the efficiency of the proposed converter is more than 85% in the load current range of 125 ? 400㎃, and the peak-topeak output voltage ripple is measured as 10 ㎷ with the 1μF external output capacitor. From these results, the proposed circuit is adequate for the battery-operated system.
Kim Jong-Hun,Kim Ha Yan,Lee Myeongjee,Jong Gyun Ahn,Baek Jee Yeon,Min Young Kim,Huh Kyungmin,Jaehun Jung,Ji-Man Kang 대한의학회 2022 Journal of Korean medical science Vol.37 No.34
Background: This study aimed to investigate whether respiratory syncytial virus (RSV) and influenza virus (IFV) infections would occur in 2021–2022 as domestic nonpharmaceutical interventions (NPIs) are easing. Methods: Data were collected from the Korean Influenza and Respiratory Virus Monitoring System database. The weekly positivity rates of respiratory viruses and number of hospitalizations for acute respiratory infections were evaluated (January 2016–2022). The period from February 2020 to January 2022 was considered the NPI period. The autoregressive integrated moving average model and Poisson analysis were used for data analysis. Data from 14 countries/regions that reported positivity rates of RSV and IFV were also investigated. Results: Compared with the pre-NPI period, the positivity and hospitalization rates for IFV infection during 2021–2022 significantly decreased to 0.0% and 1.0%, respectively, at 0.0% and 1.2% of the predicted values, respectively. The RSV infection positivity rate in 2021–2022 was 1.8-fold higher than that in the pre-NPI period at 1.5-fold the predicted value. The hospitalization rate for RSV was 20.0% of that in the pre-NPI period at 17.6% of the predicted value. The re-emergence of RSV and IFV infections during 2020–2021 was observed in 13 and 4 countries, respectively. Conclusion: During 2021–2022, endemic transmission of the RSV, but not IFV, was observed in Korea.
Probability Model of Massive Hemorrhage in Patients with Placenta Previa
( Myeong Gyun Choi ),( Jong Woon Kim ),( Wan Hu Jin ),( Yoon Ha Kim ) 대한주산의학회 2021 Perinatology Vol.32 No.2
Objective: The aim of this study was to identify the factors affecting massive hemorrhages in patients with placenta previa. We also made probability models and equations for massive hemorrhage. Methods: Seven hundred and sixty-four patients with placenta previa who underwent cesarean section from January 2011 to September 2019 were retrospectively reviewed. Massive hemorrhage was defined as a blood loss exceeding 1,500 mL or receiving over four units of packed red blood cells during cesarean section. Logistic regression analysis was used to create a probability model and identify the predictive factors for massive hemorrhage. Results: Two hundred and seventy-three (35.7%) patients had massive hemorrhages. Preoperative hemoglobin levels, multifetal gestation, emergent surgery, history of a previous cesarean section, location of the placenta, the presence of lacuna, placental adhesion, the type of placenta previa, and multiparity were selected predictive factors for massive hemorrhage. One hundred seventy-eight (23.3%) patients had placenta previa and a history of previous cesarean section. Among them, massive hemorrhage occurred in 101 (56.7%). The selected predictive factors for massive hemorrhage in patients with placenta previa and a history of previous cesarean section were emergent surgery, location of the placenta, the presence of lacuna, placental adhesion, and preoperative hemoglobin levels. An equation for massive hemorrhage in patients with placenta previa was created by combining variables. Conclusion: An equation for massive hemorrhage in patients with placenta previa was created by combining variables. These equations may help in managing placenta previa patients with high risk.