Large database study of urinary stone composition in South Korea: Korean Society of Endourology and Robotics (KSER) research series

정해도,서일영,이주용 대한비뇨의학회 2021 Investigative and Clinical Urology Vol.62 No.4

Purpose: To evaluate the characteristics of urinary stone composition in a Korean population using a large database of stone composition. Materials and Methods: From January 1, 2014, to June 30, 2019, a total of 33,078 urinary stone composition data were analyzed. Stone composition was classified into four main groups: calcium oxalate (CaOx), struvite, uric acid (UA), and calcium phosphate (CaP). We examined the relationship between stone composition and sex, age, geographic region, calendar month, and season. Results: The CaOx group (46.41%) was the largest, followed by the struvite group (29.66%), UA group (19.61%), and CaP group (4.32%). The CaOx group tended to decrease with age, but the UA group increased with age. Also, the CaOx group had the highest percentage in summer and the lowest in spring (p<0.001). The struvite and CaP groups had higher percentages of females than males (struvite: 36.6% vs. 25.7%, p<0.001; CaP: 6.2% vs. 3.3%, p<0.001). Conversely, the UA stones were more common in males than in females (24.5% vs. 11.0%, p<0.001). The UA group had the lowest percentage in the capital region (p<0.001). The total male-to-female ratio decreased over time from 1.95:1 in 2014 to 1.67:1 in 2018 (p<0.001). Conclusions: There were differences for each stone composition in the percentages according to sex, age, geographic region, month, and season. Identifying these differences based on the stone composition is vital for the treatment and prevention of urinary stones.

다바이스 웨이퍼의 평탄화와 종점 전후의 평탄화 특성에 관한 연구

정해도,김호윤 대한전자공학회 1997 電子工學會論文誌, D Vol.d34 No.12

Chemical mechanical polishing (CMP) has become widely accepted for the planarization of multi-interconnect structures in semiconductor manufacturing. However, perfect planarization is not so easily ahieved because it depends on the pattern sensitivity, the large number of controllable process parameters, and the absence of a reliable process model, etc. In this paper, we realized the planarization of deposited oxide layers followed by metal (W) polishing as a replacement for tungsten etch-back process for via formation. Atomic force microscope (AFM) is used for the evaluation of pattern topography during CMP. As a result, AFM evaluation is very attractive compared to conventional methods for the measurment of planarity. mOreover, it will contribute to analyze planarization characteristics and establish CMP model.

Korean Society of Endourology and Robotics (KSER) recommendation on the diagnosis, treatment, and prevention of urolithiasis

정해도,이주용,강동혁,고경태,고동훈,권오성,구교철,김광택,김명수,김범수,김현우,박주현,방우진,오경진,윤영은,이기수,이동섭,이상협,이승수,이헌주,정원호,조대성,조성용,추민수,최재영,최태수,한덕현,한병규,전승현,백성현,서일영,김형준 대한비뇨의학회 2023 Investigative and Clinical Urology Vol.64 No.4

This article provides evidence-based recommendations and expert opinions to aid urologists in making optimal decisions regarding managing urolithiasis in various clinical scenarios. The most frequently asked questions by urologists in their clinical practice have been collected and answered in the form of FAQs; based on the latest evidence and expert opinions. The natural history of urolithiasis is divided into active treatment and silent phases, with the active treatment stage divided into typical and special situations and peri-treatment management. The authors address 28 key questions, offering practical guidance for the proper diagnosis, treatment, and prevention of urolithiasis in clinical practice. This article is expected to be served as a valuable resource for urologists.

자동차 부품의 시작기술과 향후 과제

정해도 한국자동차공학회 2006 한국자동차공학회 Workshop Vol.2006 No.-

A Rare Case of Bronchogenic Cyst Mistaken for Adrenal Tumor

정해도,서일영 대한비뇨기종양학회 2019 대한비뇨기종양학회지 Vol.17 No.3

Bronchogenic cysts are rare congenital malformations, most often occurring in the pulmonary parenchyma or posterior mediastinum. But they can develop in the ectopic area, especially in the retroperitoneal space. We report a case of adrenal bronchial cyst treated with laparoscopic excision. A 55-year-old woman was admitted with a left adrenal tumor on computed tomography during a study for dyspnea, cough, and sweats. The function of the adrenal glands was examined, and as a result, the adrenal tumors were determined to be nonfunctional. Magnetic resonance imaging showed about an 8-cm-sized large unilocular cystic lesion with mild and high signal intensities at left suprarenal fossa on T1 and T2 images. Iodine-123 metaiodobenzylguanidine scan showed no scintigraphic evidence of neuroendocrine tumor in the left adrenal gland. We performed laparoscopic adrenalectomy with transperitoneal approach. The round, cystic mass was completely excised saving normal adrenal tissues. The operative time was 75 minutes and there was no definitive bleeding and complication. The pathologic tissue weighed 35 g and measured 88 mm×45 mm×28 mm, and cystic changes were observed on the cut surface. The pathologic examination confirmed an adrenal bronchogenic cyst. We report a very rare disease, adrenal bronchial cyst, which could be easily and safely treated with laparoscopic surgery.

회원의 소리 : 기계공학의 영역은 ?

정해도 대한기계학회 1998 기계저널 Vol.38 No.10

The First 100 Cases of Endoscopic Combined Intrarenal Surgery in Korea: Matched Cohort Analyses versus Shock-Wave Lithotripsy

정해도,문영준,Ahmad J. Almujalhem,Ali Abdullah Alqahtani,Mohammed Ali Alkhureeb,이주용 연세대학교의과대학 2022 Yonsei medical journal Vol.63 No.5

Purpose: This study presents our initial experience with endoscopic combined intrarenal surgery (ECIRS) for large renal stonesand compares the results of a propensity score-matched cohort of patients undergoing shock-wave lithotripsy (SWL). Materials and Methods: A total of 100 adults underwent ECIRS for renal stones between August 2017 and January 2019. For comparison,2172 patients who underwent a first session of SWL between January 2005 and May 2018 were included in the SWL cohort. Propensity score matching was performed using maximal stone length (MSL), mean stone density (MSD), and stone heterogeneityindex (SHI) scores. Stone-free rate (SFR) and success rate were compared between ECIRS and SWL. Results: In the ECIRS group, the mean MSL, mean MSD, and mean SHI were 28.7±15.2 mm, 1013.9±360.0 Hounsfield units (HU),209.4±104.0 HU, respectively. The SFR was 70%, and the success rate was 82.0% in this group. Although the ECIRS group had larger,harder, and more homogeneous stones than the SWL group, ECIRS showed a higher SFR and success rate than SWL. After propensity-score matching, SFR and success rate remained higher with ECIRS than with SWL (both, p<0.001). In multivariate logistic regression,smaller stone size [odds ratio (OR): 0.947, 95% confidence interval (CI): 0.913–0.979, p=0.002] and lower Seoul NationalUniversity Renal Stone Complexity score (OR: 0.759, 95% CI: 0.610–0.935, p=0.011) were independent predictors of successful ECIRS. Conclusion: ECIRS showed a higher SFR and success rate than SWL for large renal stones. Smaller stone size and lower complexityof stones were associated with a higher likelihood of successful ECIRS.

슬러리 캐스팅과 흡인주조기술을 이용한 알루미늄 금형의 쾌속제작

정해도,배원병 한국주조공학회 2000 한국주조공학회지 Vol.20 No.4

The RP&M (Rapid prototyping and Manufacturing) is the most appropriate technology for the small-lot production system, in which the production cycle is getting shorter owing to various needs from consumers. In this paper, RP&M is applied to a casting process. A casting process has a merit of being able to reflect complicated shapes at one time. But it has not been applied to the precision industry because of bad quality on surface. So we will improve characteristics of aluminum casting process using vacuum sealed casting process and porous ceramic mold which is made by slurry casting process.

CMP 공정에 사용되는 연마 소모자재 기술의 이해

정해도 한국전기전자재료학회 1999 전기전자재료 Vol.12 No.10

요로결석의 예방과 관리

정해도,이주용 대한의사협회 2020 대한의사협회지 Vol.63 No.11

The prevalence of urolithiasis is increasing not only in South Korea but also around the world. Urolithiasis has a high recurrence rate, therefore, reducing it is very important in the quality of life for stone formers. For this purpose, dietary modifications and drug therapy can be performed through stone analysis and 24-hour urine collection. Stone analysis is recommended for all stone formers, and the 24-hour urine collection is usually recommended for recurrent stone formers or high-risk groups. A general dietary modification for all stone formers includes a sufficient fluid intake, low levels of sodium, sugar, and animal protein, a normal calcium diet, as well as a high amount of citrate intake. Drug therapy should be performed in cases such as the recurrence of stones or increase of the existing ones, even after the application of preservation therapy, such as dietary modification. The ideal drug therapy should prevent the occurrence of urolithiasis, have no side effects, and have a suitable patientsʼ compliance. Follow-up should be performed periodically, through 24-hour urine collections and imaging studies. For follow-up imaging studies, a lowdose non-enhanced computed tomography is recommended, and it can be performed once a year if the patient is in a stable state. To control various and complex metabolic abnormalities in recurrent stone formers, multiple approaches may be required through diet modifications, drug therapy, treatment of the metabolic syndrome, and lifestyle modifications.