이상 시에 나타난 다다이즘적 특성에 관한 연구

이재복(Jae Bok Lee) 한국언어문화학회 2000 한국언어문화 Vol.18 No.-

The main purpose of the thesis is to pursue the Dadaistic features of Lee-sang`s Poetry. Lee-sang`s Poetry, as a whole, is discoursed in the Dadaism and the Surrealism. Both of these are not technical but social and historic. Especially, among these two terms Dadaism, first of all, regards to the social and history, they have negative sprit. In this respcet, I studied Lee-sang`s Poetry. As the result of this point of view, he was a poet who wrote poem fiercely as like the fighter, in the colonical era. His negative thought should be realive through the modern poets. In order that his dadaistic spirit accepted the aethetic dialectic, he said, desperate give birth to technic(language) and technic(language) give birth to desperate. That`s the reason why we think over and over.

갑상선 미세유두암에서 갑상선 주변 조직 침윤(Minimal Extrathyroid Extension)의 임상적 의의

이재복,김훈엽,우상욱,류우상,이정아,손길수,배정원,이유미<SUP>1<.SUP>,Jae Bok Lee,Hoon Yub Kim,Sang-Wook Woo,Woo Sang Ryu,Jung Ah Lee,Gil Soo Son,Jung-Won Bae,and Yu Mi Lee,Ph.D.<SUP>1<.SUP> 대한갑상선-내분비외과학회 2008 The Koreran journal of Endocrine Surgery Vol.8 No.4

Purpose: The prognosis of papillary thyroid carcinoma is determined by such risk factors as old age, male gender, a large tumor size and extrathyroid extension. The aim of this study was to investigate the value of extrathyroid extension for the recurrence of papillary microcarcinoma and its association with the risk factors for papillary thyroid carcinoma. Methods: We retrospectively studied 167 patients with papillary microcarcinoma and who underwent thyroidectomy from Feb. 2003 to Dec. 2008. Papillary microcarcinoma (PTMC) was defined as a tumor smaller than 1 cm and an extrathyroid extension was identified by the pathological findings. Age, gender, extrathyroid extensions, the operative methods, lymph node metastasis and the MACIS score were analyzed by the appropriate statistical methods. Results: Patients with PTMC showed a lower MACIS score, fewer lymph node metastasis and less extrathyroid extension, as compared to the patients with papillary thyroid carcinoma. Total thyroidectomy and selective lymph node dissection were less frequently done in the patients suffering with PTMC. Analysis of the risk factors showed that PTMC had a close relationship with lymph node metastasis, the extent of surgery and multifocal cancer. The disease free survival rate of the patients with PTMC was statistically related with lymph node metastasis, but not with an extrathyroid extension (P=0.001). Conclusion: The patients with PTMC showed less lymph node metastasis and extrathyroid extension as compared to the patients with PTC. Lymph node metastasis of PTMC is an independent factor for disease free survival, but minimal extrathyroid extension is not related with recurrence. PTMC with lymph node metastasis should be regarded as an aggressive large tumor and lymph node dissection should be done. (Korean J Endocrine Surg 2008;8:243-249)

1단 전기 집진기에서 2차 유동이 집진 효율에 미치는 영향

이재복,배귀남,황정호,Lee, Jae-Bok,Bae, Gwi-Nam,Hwang, Jung-Ho 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.2

The ionic wind formed in a nonuniform electric field has been recognized to have a significant effect on particle collection in an electrostatic precipitator(ESP). Under normal operating conditions the effect of ionic wind is not pronounced. However, as the flow velocity becomes smaller, the ionic wind becomes pronounced and induces secondary flow, which has a significant influence on the flow field and the particle collecting efficiency. In this paper, experiments for investigating the effect of secondary flow on collection efficiencies were carried out by changing the flow velocities in 0.2-0.7m/s and the applied voltages in 9-11kV/cm. The particle size distributions and concentrations are measured by DMA and CNC. To analyze the experimental results, numerical analysis of electric filed in ESP was carried out. It shows that particle collection is influenced by two independent dimensionless numbers, $Re_{ehd}\;and\;Re_{flow}$ not by $N_{ehd}$ alone. When $Re_{flow}$, decreases for constant $Re_{ehd}$, the secondary flow prohibits the particle collection. But when $Re_{ehd}$ increases for constant $Re_{flow}$, it enhances the particle collection by driving the particles into the collection region.

코로나 방전 반응기에서 Carbon Soot 입자의 재비산

이재복,황정호,배귀남,Lee, Jae-Bok,Hwang, Jung-Ho,Bae, Gwi-Nam 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.7

Among the various types of diesel after-treatment device, the corona discharge reactor may be considered as a powerful process for trapping submicron particles. But after precipitation on the electrodes occurs, the reentrainment of particles is severe and often causes low or negative precipitation efficiency. Experiments were performed to investigate the effect of an applied voltage on the reentrainment of soot particles from the electrodes. A co-annular laminar diffusion flame burner was used as the soot generator. When a highly negative voltage was applied, exfoliation of the deposited soot particles and an increase in concentration of particles smaller than approximately 150 nm were observed. Turbulence induced from the negative tuft corona and sputtering caused particle reentrainment from the corona wire and from plates as well. Under soot laden combustion gas, a streamer corona often occurred in the wire-cylinder reactor. Because of its transient nature, streamer corona violently increased the concentration of reentrained particles and CO gas.

전기 분무 시스템의 전기수력학적 특성

이재복,황정호,Lee, Jae-Bok,Hwang, Jung-Ho 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.8

Electrospraying comprises the generation of liquid droplets by applying a high voltage to the surface of a liquid. By monitoring the current and the flow rate it was possible to obtain a stable cone jet mode in a given condition. In this work the liquid contained NaCl particles resolved in distilled water. The NaCl particles increased concentration of the ionized solution and thus increased electrical conductivity of the liquid, which was inversely proportional to the flow rate in the cone jet mode. A number of sprayed droplets were sampled and dried enough, and then the size of NaCl particles were measured. The measured droplet diameter was a little larger than two theoretical diameters, Rayleigh diameter and mobility diameter.

IEC 62305-4 : 구조물 내부의 전기전자시스템 뇌보호

이재복,Lee, Jae-Bok 한국조명전기설비학회 2005 조명.전기설비 Vol.19 No.6

생물학적 슬러지의 여재저항 모형에 관한 연구

이재복,권일,곽복식 ( Jae Bok Lee,Il Kwon,Bok Sik Kwak ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.2

Sludge dewatering is a common practice in many wastewater treatment plants. At the beginning of the cake filtration, particles smaller than the openings of filter medium pass through the medium. However, adhesion or trapping of solids occurs as the filtrate containing fine particles flows through the porous filter medium. The principal role of a filter medium is to separate solids from flowing liquid with a minimum consumption of energy. The particle size distribution of sludges were measured using Malvern Mastersizer, which was based on laser diffraction. The median values in particle size distribution were 20.75㎛ and 40.25㎛ respectively for the anaerobically digested sludge and the waste activated sludge used in this study. Increases of the medium resistance in according to the cake mass were found from the permeability test. The results were well explained by Tiller`s empirical equation including the medium resistance constant and the medium clogging constant. Total resistance in cake filtration was also measured with the permeability test and the average specific resistance was calculated from the slope of the regression result. The proper selection of filter medium will cause to decrease the energy consumption for the biological sludge dewatering.

부갑상선 질환 및 치료 방침

이재복,Jae Bok Lee 대한갑상선-내분비외과학회 2012 The Koreran journal of Endocrine Surgery Vol.12 No.4

The role of surgery in parathyroid disease has shown a recent decrease with development of calcinomimetics such as cinacalcet. During thyroid surgery, every endocrine surgeon makes every effort to preserve the parathyroid gland. However, postoperative hypoparathyroidism cannot be completely prevented. Knowledge of the precise anatomy of the parathyroid, including embryological movement of parathyroid glands, is needed. Surgical indications of parathyroidectomy include primary hyperparathyroidism, secondary hyperparathyroidism, tertiary hyperparathyroidism and parathyroid carcinoma. Parathyroidectomy for primary hyperparathyroidism has shown a significant change due to introduction of the sestamibi scan, intraoperative PTH assay, and focused parathyroidectomy. Minimally invasive surgery has now become standard operation for primary hyperparathyroidism. However, focused unilateral parathyroid operation should be done very cautiously because you can lose the chance of cure. Recurrence rate after parathyroidectomy is approximately 5% and experience of a surgeon can only reduce this rate. Surgery for secondary hyperparathyroidismis performed in only 1∼2% of CKD patients. Surgical methods include subtotal parathyroidectomy, total parathyroidectomy, and total parathyroidectomy with autotransplantation and the results of the operation are not different. With the introduction of cinacalcet, comparison between surgery and medication showed an effective drop down of serum PTH level and increase of BMD only in surgery. Cincalcet did not show improvement of mortality, vascular calcification, and nephrplithiasis. According to oneJapanese report, PTH more than 500 pg/ml, size larger than 1 cm, and more than two enlarged parathyroid favor parathyroidectomy in renal osteodystrophy. During parathyroid surgery, high suspicion for carcinoma gives the only chance for cure because en bloc resection is important. Parathyroid disease has evolved since introduction of Cinacalcet and endocrine surgeons should join with physicians as a team for development of a treatment plan.

다중 접지계 GPR 수치 해석을 위한 최적 모델링 기법

이재복,장석훈,명성호,조연규,Lee, Jae-Bok,Chang, Sug-Hun,Myung, Sung-Ho,Cho, Yeon-Gyu 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.11

본 연구는 combined integration/matrix method에 의해 다양한 접지 시스템의 특성을 모의할 수 있는 수치 해석 기법에 관한 연구이다. Combined integration/matrix method는 접지 시스템을 일정한 길이의 요소로 분할하여 미리 적분을 한 후 적분된 길이 요소 기법에 대해 matrix method를 사용하는 방법으로 연산 시간 및 해석시 에러 발생을 줄일 수 있다. 이를 위해 본 연구에서는 수치 해석시 분할 요소 길이에 대한 오차 분석을 통해 최적의 요소길이 산정 방법을 제시하였으며 이를 통해 실규모 접지 시스템의 다양한 형태의 접지 시스템의 성능 분석이 가능하도록 하였다. 오차 분석을 토대로 접지 전극의 길이와 매설 깊이에 따라 적절하게 요소의 길이를 도출한 결과 분할하고자 하는 요소의 길이는 매설 깊이와 접지 도체의 길이에 주요한 상관 관계가 있음을 알 수 있었으며 본 연구에서 제시한 수치 해석 모델링 방법에 따라 3 % 이내의 해석 정확도를 얻을 수 있었다. 또한, 이를 다중 접지계 해석에 적용하여 현재 산업 플랜트 접지 방식에서 가장 논란이 되고 있는 전원 접지계와 신호/통신 접지계의 공통 접지 및 분리 접지의 영향 평가 등에 활용될 수 있음을 보여주었다. This paper describes the numerical analysis techniques using the Combined Integration/Matrix Method to calculate ground potential rise which can be occurred in the various grounding systems. Combined Integration/Matrix Method is used to reduce the error and computation time with the analytical integration equation and the proper segmentaion of earth embedded conductor. To do it, optimal segmentaion method for the buried conductors is presented through error analysis which is capable of applying the practical scaled various grounding systems. The optimum length of segmented element is much co-related with the buried depth of grounding electrode and the maximum length of buried electrode. As a result, less 3 precent errors was obtained by proposed model. The proposed model is applied to verify an effect of multi-grounding problems which was aroused much controversy with separated or common grounding between the high power grounding system and low power grounding system such as signal and telecommunication grounding.

핀-핀 형 또는 판-판 형 전극에 인가된 AC 전기장이 에틸렌 정상 확산 화염 Soot 입자 배출에 미치는 영향

이재복,황정호,Lee, Jae-Bok,Hwang, Jeong-Ho 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.8

In our previous study, it was proven that the mean size and the total number concentration of carbon soot particles emitted from a $C_2$H$_4$ normal diffusion flame decreased when a DC corona was discharged to pin-pin electrodes. In this work the effect of AC corona discharge on soot emission was investigated and compared with that of DC corona discharge. For the pin-pin electrodes the size of soot particles and the number concentration decreased by the AC voltage. There were only slight changes in size distribution with frequencies, while the magnitude of applied voltage was constant. When the electric field was applied to plate-plate electrodes, the size and the number concentration also decreased with the applied AC voltages. For applied voltages above 2kV the effect of frequency increase on the soot emission was effective.