충수염의 임상적 고찰과 초음파의 유용성

박정배,양혁준,김형수,황성연,박철완,이근 대한응급의학회 1995 대한응급의학회지 Vol.6 No.2

Appendicitis is the most common acute abdomen in Emergency Medical Center & outpatient department. But sometimes, it is difficult for us to diagnose because of clinically variable symptoms. We reviewed the ultrasonographic findings and analyse 521 cases of appendectomy patients about its distribution of sex and age, seasonal prevalence, clinical symptom and signs, laboratory findings, duration from onset of symptom to arrival at hospital, duration from arrival at hospital to operation, vital signs, operative results, and associated diseases, which were treated at the department of General Surgery & Emergency Medical Center in Chung Ang Gil Hospital from July, 1994 to June, 1995. The results were as follows : 1. The most common age group was second decade. And male to female ratio was 1.43:1. Seasonal variation was not significant. 2. Of 521 cases, 141 cases(27.1%) visited the hospital within 24 hours from the onset of symptom, and 259 cases(49.7%) visited between 24 to 48 hours. 3. In duration from arrival to operation, the cases within 6 hours were 263 (50.5%), the cases between 6 and 12 hours were 131(25..1%). 4. In systolic blood pressure, cases below 90mmHg were 19(3.6%), cases above 160mmHg were 23(4.4%). Below 60mmHg diastolic pressure were 55 cases(10.6%), cases above 110mmHg were 9(1.7%). In pulse rate, above 90 rate/min were 171(32.8%). 5. On admission leukocytosis was found in 413 cases(79.3%) and 342 cases of them were pathologic appendicitis. 6. Ultrasoundgraphy was performed in the 87 cases, but 23 cases were suggested appendicitis. Among 23 cases, 22(95.7%) revealed pathologic appendicitis at ooperation and labortatory examination. Of the 64 cases which were normal on ultrasonography, only 2 cases(3.1%) were proved to be appendicitis. 7. The results of 496 operations without ultrasonography were appendicitis in 390 cases(78.6%), mesenteric lymphadenopathy 36(7.3%), pelvic inflammatory disease 28(5.6%), fecalith 15(3.0%), terminal ileitis 8(1.6%), diverticulitis 7(1.4%), urinary tract stones 5(1.0%), cecal cancer 2 cases, right ovarian tumor 2 cases, tubo-ovarian abscess 2 cases, grater omentum internal hernia 1 case. Our results showed that the sensitivity of ultrasonohraphy was 95.8% and the specificity 98.4% in the diagnosis of appendicitis, It suggests that the ultrasonography is very helpful in the diagnosis & differential diagnosis of acute appeendiditis.

TFELD 절연층을 위해 ITO glass위에 증착된 (Ba_(0.5),Sr_(0.5))TiO₃박막의 특성

김정환,배승춘,권성렬,정훈,박진우,김기완 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

We have studied that dielectric and electrical properties of (Ba_(0.5),Sr_(0.5))TiO_(3) thin films deposited on Indium Tin Oxide-coated glass substrate by using rf-magnetron sputtering method in this paper. Substrates were heated at room, 300℃ , 400℃, and 500℃. Working pressure was changed 5mTorr, 10mTorr, 20mTorr, 30mTorr respectively substrates temperature, and Ar:O_(2), ratio was fixed 9:1. SEM analysis was conducted to investigate thickness of BST thin films. Dielectric constant, current-voltage(I-V), and transmittance were measured. We observed difference of that thickness, dielectric constant, current-voltage(I-V), and transmittance due to variable substrates temperature and working pressure. We also obtained best conditions at 400℃, 30mTorr. Dielectric constant was 209.1 at 1kHz, leakage current density was below 7.35X10^(-7)A/cm^(2) at 100V, and transmittance was over 91%.

사지의 주요 동맥손상의 처치: 23증례에 대한 분석

원형섭,김상은,배성만,박철완,이 근,조상훈,김상일,우병완 大韓應急醫學會 1996 대한응급의학회지 Vol.7 No.1

Extremity vascular trauma is common in most emergency centers, and controversy remains about the optimal management of arterial injuries. Retrospectively we reviewed the records of 23 patients who had upper or lower extremity arterial trauma from July 1994 to December 1995. The purpose of this study was to evaluate our department`s management policy to major arterial injuries. The leading cause of major arterial injuries was penetrating trauma. We found that there were clinical findings such as absence of or decreased strength of pulsation(82.6%), cool ischemic extremity(69.6%), large expanding hematoma(43.5%), major bleeding(17.4%) and bruit or thill(8.7%). We gave the priority to management of life-threatening injuries and applied the pressure dressing to wounds as early as possible. There were 18 men(78.3%) and 5 women(21.7%); the mean age was 35(range 20-56 years old) years. There were 12 arterial injuries(52.2%) in the upper extremity and 11 arterial injuries(47.8%) in the lower exteremity. The most commonly injured artery was the brachial artery in the upper(34.8%) and the femoral artery in the lower(30.4%) extremity. The etiology included knife stabbing in 10 patients(43.5%), motor vehicle accidents in 6(26.1%), industrial accidents in 4(17.4%), falls in 2(8.7%) and a farm equipment accident in 1 patient(4.3%). The associated injuries were muscle injuries(78.3%), fracture(56.5%), nerve injuries(52.2%), vein injuries(43.5%), shock(17.4%) and dislocation(13.0%). All patients with arterial injuries were given a preoperative prophylactic antibiotic and TIG(tetanus immunoglobulin). We used Doppler technique as a means of detecting the blood flow. Fourteen patients(60.9%) underwent preoperative arteriography in the radiology department. We performed surgical exploration as soon as major arterial injuries were suspected. The most common methods of treating major arterial injuries were interposition vein graft(69.6%) and end to end anastomosis(21.7%). Systemic or locally infused heparin was used for all vascular repairs. In many of our patients(56.5%), fasciotomy was performed before the vascular repair, as a part of the exploration of the distal arteries. There were 2 amputations(8.7%) but no death. The reason for secondary amputation were wound infection in one and failure to achieve sufficient arterial flow to the involved extremity with resulting gangrene in the other. As the time factor is vitally important in the management of arterial injuries, we advocate prompt and early surgical treatment within 6 hours of the trauma. In conclusion, we believe that the crucial factorsin successful management of major arterial injuries of the extremities are early diagnosis, prompt treatment, complete debridement, fasciotomy when indicated, and simultaneous treatment of concomitant injuries.

Breeding of new silkworm variety, ‘Chilseongjam’ with peculiar laval mark

( Seong-wan Kim ),( Kee-young Kim ),( Seong-ryul Kim ),( Su-bae Kim ),( Sang-duk Ji ),( Nam-suk Kim ),( Hae-yong Kweon ),( You-young Jo ),( Jong-gil Kim ) 한국잠사학회 2018 International Journal of Industrial Entomology Vol.37 No.2

A new silkworm variety ‘Chilseongjam’ was bred for special purpose as educational learning and festivals. Their breeding history and major characteristics are as follows. The Chilseongjam variety was selected and succeeded from the F1 of Galwon x C721 in 2009 autumn. They are showing 94% (spring & autumn) of high practical hatching ratio. The larval period of Chilseongjam (spring: 23 d, autumn: 24 d 3 h) was shorter than that of Daebakjam (spring: 24 d, autumn: 25 d 23 h). In the pupation percentage, Chilseongjam (spring: 96.6%, autumn: 86.1%) is similar to Daebakjam Daebakjam (spring: 96.3%) in spring, but autumn is lower than Daebakjam (autumn: 94.9%). Single cocoon weight (spring: 1.57 g, autumn: 1.29 g) and Cocoon yield (spring: 14.2 kg, autumn: 11.1 kg) were lower than those of Daebakjam (spring: 2.76 g, 25.4 kg, autumn: 2.19g, 20.2 kg), respectively. The new silkworm variety, Chilseongjam showed higher pupation rate than control variety. This variety can be used as a educational learning and festivals.

서울특별시 단독주택 과세 평가의 형평성에 관한 연구

배성완 ( Bae Seong Wan ),유정석 ( Yu Jung Suk ) 한국감정평가학회 2017 감정평가학논집 Vol.16 No.1

본 연구에서는 서울특별시 개별주택 공시가격을 대상으로 COD, PRD, 회귀분석 및 분위회귀분석을 통해 과세의 수평적 형평성과 수직적 형평성을 검증하였다. 서울특별시 개별주택 공시가격에는 수평적 불공평이 존재하는 것으로 나타났고, 부지면적과 건물연면적이 클수록 과대평가되며, 건축연령이 증가할수록 과소평가되는 것으로 나타났다. 특히, 강남구와 비교했을 때 모든 구가 상대적으로 과소평가되고 있는 것으로 나타났다. 그리고 가격 수준에 따라 개별특성이 수평적 형평성에 주는 영향의 정도가 상이한 것으로 나타났다. 수직적 형평성과 관련하여 분석모형에 따라 다소 상이한 결과를 보이고 있으나 서울특별시 개별주택 공시가격에는 역진적 불공평이 존재하는 것으로 나타났다. 과세 평가 불공평의 원인은 표준주택공시가격과 실거래가격의 차이와 주택가격비준표의 불완전성이며, 본 연구는 이에 대한 개선방안을 제시하고 있다. This paper examines the horizontal and vertical equity of tax, using the results of COD(Coefficient of Dispersion), PRD(Price-Related Differential), regression analysis and quantile regression analysis in Seoul housing assessment value. This study finds the horizontal inequity in Seoul housing assessment value; houses with larger site area and total floor area are overvalued while older houses are undervalued. Especially, assessment value appears to be underappreciated in every other Gu, when compared with the Gangnam-Gu. In addition, this study finds that the impact of property characteristics on horizontal inequity differs depending on the level of price. In regards to vertical equity, the study finds regressive inequity In Seoul housing assessment value. The causes leading taxation inequity is difference of standard housing value and housing sales price and incompleteness of housing comparative table, and this study suggests improvements to eliminate them.

머신 러닝 방법과 시계열 분석 모형을 이용한 부동산 가격지수 예측

배성완(Seong Wan Bae),유정석(Jung Suk Yu) 한국주택학회 2018 주택연구 Vol.26 No.1

본 연구의 목적은 부동산 가격지수 예측을 위한 머신 러닝 방법의 활용가능성을 확인하는 것이다. 이를 위해 머신 러닝 방법인 서포트 벡터 머신, 랜덤 포레스트, 그래디언트 부스팅 회귀 트리, 심층신경망, LSTM과 시계열분석 방법인 자기회귀이동평균모형, 벡터자기회귀모형, 베이지언 벡터자기회귀모형을 이용하여 아파트 매매실거래가격지수를 예측하고 모형간 예측력을 비교하였다. 연구 결과, 첫째, 머신 러닝 방법의 예측력이 시계열분석 모형보다 우수한 것으로 나타났다. 둘째, 시장이 안정적인 상황에서는 머신 러닝 방법과 시계열분석 방법 모두 시장 추세를 적절히 예측하는 것으로 나타났다. 셋째, 구조적인 변화 또는 외부 충격으로 시장이 급변하는 경우 머신 러닝 방법은 시장 추세를 대체로 유사하게 예측하는 것으로 나타났으나, 시계열분석 방법은 시장 추세를 전혀 예측할 수 없는 것으로 나타났다. 향후 머신 러닝 방법을 활용함으로써 부동산 시장에 대한 예측의 정확성이 향상 될 것으로 기대된다. This study aims to explore the feasibility of using machine learning methods to forecast the real estate price index. To do so, machine learning methods, such as support vector machine, random forest, gradient boosting regression tree, deep neural networks, and long short term memory networks (LSTM), and the time series analysis methods such as the autoregressive integrated moving average model (ARIMA), the vector autoregression model (VAR), and the Bayesian vector autoregressive model (Bayesian VAR), were used to predict the real estate price index for apartments. The following were the main findings of the comparison of their predictive abilities. First, the predictive power of machine learning methods is superior to that of the time series analysis methods. Second, in a stable market situation, both machine learning and time series analysis methods can predict market trends moderately well. Third, when the market undergoes a dramatic change due to structural changes or external shocks, the machine learning method can accurately predict market trends for the most part, whereas the time series analysis method fails to do so. Thus, the accuracy of real estate market forecasts can be expected to improve with the use of machine learning methods.

표본 주택 가격 기반 부동산 가격지수 산정: 머신 러닝 방법의 활용을 중심으로

배성완(Seong-Wan Bae),유정석(Jung-Suk Yu) 한국주택학회 2018 주택연구 Vol.26 No.4

The Purpose of this study is to estimate the real estate price index based on the ‘estimated price by machine learning’. The price of a sample house was estimated using the machine learning method ‘Random forest’ and ‘Deep neural networks’, and the real estate price index was calculated using the Jevons index calculation method. First, the result of the study showed that the RF index and DNN index are similar, and the variability was changed according to the learning period. Second, the RF index and DNN index showed similar long-term trends compared to the KAB index, but it was found that there was a considerable difference in short-term trends. Third, the RF index and DNN index were found to be more variable than the KAB index, KB index, and real transaction price index, and the relationship with real transaction price index could not be confirmed. If the researcher’s qualitative analysis on the RF index and DNN index is added, it is expected that there is a high possibility of utilization as a new price index that can improve existing price index.

Breeding of new silkworm variety, 'Chilseongjam' with peculiar laval mark

Kim, Seong-Wan,Kim, Kee-Young,Kim, Seong-Ryul,Kim, Su-Bae,Ji, Sang-Duk,Kim, Nam-Suk,Kweon, Hae-Yong,Jo, You-Young,Kim, Jong-Gil Korean Society of Sericultural Science 2018 International Journal of Industrial Entomology Vol.37 No.2

A new silkworm variety 'Chilseongjam' was bred for special purpose as educational learning and festivals. Their breeding history and major characteristics are as follows. The Chilseongjam variety was selected and succeeded from the F1 of Galwon ${\times}$ C721 in 2009 autumn. They are showing 94% (spring & autumn) of high practical hatching ratio. The larval period of Chilseongjam (spring: 23 d, autumn: 24 d 3 h) was shorter than that of Daebakjam (spring: 24 d, autumn: 25 d 23 h). In the pupation percentage, Chilseongjam (spring: 96.6%, autumn: 86.1%) is similar to Daebakjam Daebakjam (spring: 96.3%) in spring, but autumn is lower than Daebakjam (autumn: 94.9%). Single cocoon weight (spring: 1.57 g, autumn: 1.29 g) and Cocoon yield (spring: 14.2 kg, autumn: 11.1 kg) were lower than those of Daebakjam (spring: 2.76 g, 25.4 kg, autumn: 2.19g, 20.2 kg), respectively. The new silkworm variety, Chilseongjam showed higher pupation rate than control variety. This variety can be used as a educational learning and festivals.

Continuous renal replacement therapy for the treatment of acute kidney injury

( Woo Kyun Bae ),( Dae Hun Lim ),( Ji Min Jeong ),( Hae Young Jung ),( Seong Ku Kim ),( Jeong Woo Park ),( Eun Hui Bae ),( Seong Kwon Ma ),( Soo Wan Kim ),( Nam Ho Kim ),( Ki Chul Choi ) 대한내과학회 2008 The Korean Journal of Internal Medicine Vol.23 No.2

Background/Aims: Continuous renal replacement therapy (CRRT) has been widely used for treating critically ill patients with acute kidney injury (AKI). Whether CRRT is better than intermittent hemodialysis for the treatment of AKI remains controversial. We sought to identify the clinical features that can predict survival for the patients who are treated with CRRT. Methods: We analyzed the data of 125 patients who received CRRT between 2005 and 2007. We identified the demographic variables, the underlying diagnoses, the duration of CRRT, the mean arterial blood pressure (ABP) and the Simplified Acute Physiology Score (SAPS) II. The classification/staging system for acute kidney injury (AKI) was applied to all the patients, who were then divided into stage 1-3 subgroups. Results: The average age of the patients was 61.414.3 years and the mortality rate was 60% (75 of 125 patients). The survivors had a significantly higher mean ABP and a higher mean serum bicarbonate level, which were measured the day after CRRT, than the nonsurvivors (86.723.7 vs. 69.224.6 mm Hg, respectively, 21.43.5 vs. 16.45.4 mmol/L, respectively,; p<0.05 for each). The stage 3 AKI patients showed the worst parameters for the SAPS II score and the serum levels of creatinine and blood urea nitrogen. The mortality rate was higher for the stage 3 subgroup than the other groups (70.5%, p<0.05). Conclusions: The patients with AKI and who require CRRT continue to have a high mortality rate. A higher mean ABP and a higher serum bicarbonate level measured the day after CRRT may predict a more favorable prognosis. The staging system for AKI can improve the ability to predict the outcomes of CRRT patients.

Nosocomial Outbreak of COVID-19 from a Kidney Transplant Patient: Necessity of a Longer Isolation Period in Immunocompromised Patients

Kim Chang Seong,Kim Uh Jin,Lee Yoonjung,Lee Unhee,Choi Okja,Kim Sun-Hee,Lee Kwangho,Chung Yoon-Seok,Choi Hong Sang,Bae Eun Hui,Ma Seong Kwon,Kim Seong Eun,Kang Seung-Ji,Jung Sook-In,Kim Soo Wan,Park K 대한감염학회 2023 Infection and Chemotherapy Vol.55 No.1

Background: Determination of the release from isolation for coronavirus disease 2019 (COVID-19) in immunocompromised patients who need additional hospitalization for treatment of non-COVID-19 related disease is important to prevent nosocomial transmission. However, there is insufficient evidence for an extended isolation period. Materials and Methods: In September 2021, when the Delta variant was dominant, a nosocomial outbreak of COVID-19 occurred in the nephrology ward of a tertiary hospital in Gwangju, Korea. We conducted epidemiological investigations and whole-genome sequencing (WGS) of this virus. Results: A man who underwent kidney transplantation was admitted to our hospital for the treatment of acute kidney injury. He was diagnosed with asymptomatic COVID-19 infection during a pre-admission screening test on September 1, 2021 and underwent isolation. After 10 days of isolation in the COVID-19-designated ward, he was transferred to the general nephrology ward. He underwent steroid pulse therapy (September 17 to September 23, >60 mg/day prednisolone) due to acute T-cell rejection. On September 28, 2021, the first patient with COVID-19 was identified in the nephrology ward, and a rapid-response team was activated to identify additional patients with COVID-19 and prevent the spread of COVID-19. Epidemiological investigations revealed that 12 patients, two caregivers, and three healthcare workers from the nephrology ward were diagnosed with COVID-19. The WGS of specimens from 14 nosocomial outbreak samples and released an index patient exhibited the same Delta variant originating from the B.1.617.2 lineage. This hospital-acquired COVID-19 outbreak in the nephrology ward resulted in two (11.7%) deaths in patients who underwent kidney transplantation. Conclusion: We demonstrated that an immunocompromised patient can cause a nosocomial outbreak due to the prolonged shedding of infectious viruses. Prolonged isolation in patients under active immunosuppressive therapy may be necessary to prevent transmission, especially in the hospital setting.