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경부 종류의 세침 흡인 세포학적 검사에 대한 임상적 고찰
임종학(Jong Hak Lim),김재준(Jae Jun Kim),이동화(Dong Hwa Lee),허경발(Kyung Bal Hur) 대한두경부종양학회 1992 대한두경부 종양학회지 Vol.8 No.1
Neck mass is common neoplasms, but it poses a diagnostic dilemma for the physician. The differential diagnosis include neoplastic, inflammatory and developmental causes. The FNAC is one of the most valuable tests in the initial assessment and differential diagnosis of the neck mass. FNAC was performed with 267 cases of the neck mass, during the period from April, 1988 to October, 1990 at the department of General Surgery, Soon Chun Hyang. University Hospital. Thyroid lesions were excluded from this analysis. Final diagnosis was based on resection histology in 58 cases, and surgical specimens were compared with FNAC. The following results were obtoired ; 1) Of 267 cases, there we re 9 cases(3.4%) of congenital lesion, 74 cases(27.7%) of inflammatory lesion, 40 cases(15.0%) of benign tumor, 12 cases(4.5%) of primary malignant tumor, 37 cases(13.8%) of metastatic tumor, 75cases(28.1%) of reactive hyperplasia, 20 cases(7.5%) of unsatisfactory. In the pathologic classification, inflammatory lesion was the most common. 2) In the 58 cases of excisional biopsy, sensitivity 93.8%, specificity 95.2%, false positive 11.8%, false negative 2.4%, positive predictive value 88.2%, negative predictive value 97.6%, accuracy 94.8%. 3) The most common disease was the tuberculous lymphadenitis (53 cases, 19.8%). sensitivity 57.9%, specificity 100.0%, false positive 0.0%, false negative 17.0%, positive predictive value 100.0%, negative predictive value 83.0%, accuracy 86.2%.
저분진 케이블 POD 생산을 위한 히팅 롤러의 열전도 분석
송영준(Young-Jun Song),임종학(Jong-Hak Lim),변영일(Young-il Byun),홍성민(Seong-Min Hong),정영환(Young-Hwan Jeong),박장용(Jang-Yong Park),송철기(Chul Ki Song) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.1
The heating roller of an actual pulse output device (POD) production facility is composed of a steel roller and a rubber roller. The time to reach a specific temperature and the temperature distribution on the roller surface were analyzed and compared according to the change in the number of cartridge heaters inside the heating roller. In this analysis, a steady-state thermal analysis of a steel roller was performed for the cases of a 5-cartridge heater and 9-cartridge heater. Finite element analysis was applied with reference to the surface temperature data of the heating roller during operation and the calorific value of the cartridge heater. Using the 9-cartridge heater, faster target temperature achievement and more uniform temperature distribution were confirmed than for the 5-cartridge heater.
선박 유압공급 장치용 사판식 유압 피스톤 펌프의 구조적 안정성에 관한 연구
곽범섭(Beom-Seop Gwak),임종학(Jong-Hak Lim),이인욱(In-Wook Lee),이중섭(Chung-Seob Yi),이호성(Ho Seong Lee),송철기(Chul Ki Song) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.4
In this paper, a structural stability analysis of the swash plate hydraulic piston pump installed on hydraulic supply systems in marine vessels is presented. In order to verify the integrity of the pump design, a standard structural analysis technique based on the finite element method has been applied for various operating and boundary conditions. For the maximum operational torque (223 N·m) at 5°, 10°, and 15° of the swash plate angle, the maximum deformation, equivalent stress and safety factor are evaluated. The analytical results show that under current operating conditions, the structural reliability of the design has been confirmed.
선박 유압공급 장치용 사판식 유압 피스톤 펌프 내부 유동해석에 관한 연구
이중섭(Chung-Seob Yi),이정실(Jeong-Sil Lee),임종학(Jong-hak Lim),곽범섭(Beom-Seop Gwak),이호성(Ho Seong Lee),송철기(Chul Ki Song) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.1
In this paper, a flow analysis of a swash-plate type hydraulic piston pump installed on a hydraulic flow supply system for marine vessels is presented. A model and governing equations for computational fluid dynamics (CFD) analyses of swash-plate type hydraulic piston pumps were built, and simulation results regarding the internal flow field of the pump were obtained. By analyzing the internal flow of the swash-plate type hydraulic piston pump, we can confirm the time-dependent stroke of each piston as the pump rotates. We also verified that by analyzing the pulsating flow against the slope of the swash plate, the simulation results match well with the experimental results. The natural frequency of the system was computed to be approximately 380 Hz by applying and analyzing the fast Fourier transform (FFT) of each swash plate slope evaluated.