신경회로망을 이용한 PID구조를 갖는 자기동조제어기의 설계

조원철,정인갑,심태은,Cho, Won-Chul,Jeong, In-Gab,Shim, Tae-Eun 대한전자공학회 2002 電子工學會論文誌-SC (System and control) Vol.39 No.6

본 논문에서는 시간지연이 존재하고 시스템의 영점이 단위원 밖에 있으며 시스템 파라미터가 변하는 비선형 시스템에 적응하는 신경회로망을 이용한 PID구조를 갖는 일반화 최소분산 자기동조제어기를 제안한다. 신경회로망은 제어기 파라미터를 추정하며 제어 출력은 추정된 제어기 파라미터로부터 얻어진다. 제어 알고리듬의 타당성을 확인하기 위해 시간 지연이 있고 일정한 시간이 경과한 후 시스템의 파라미터가 변하는 비선형 비최소위상 시스템에 대해 컴퓨터 시뮬레이션을 하였다. 그리고 신경회로망을 이용한 직접 적응 제어기와 비교하였다. This paper presents a generalized minimum-variance self-tuning controller with a PID structure using neural network which adapts to the changing parameters of the nonlinear system with nonminimum phase behavior and time delays. The neural network is used to estimate the controller parameters, and the control output is obtained through estimated controller parameter. In order to demonstrate the effectiveness of the proposed algorithm, the computer simulation is done to adapt the nonlinear nonminimum phase system with time delays and changed system parameter after a constant time. The proposed method compared with direct adaptive controller using neural network.

고속의 직물 제직 공정에서 광학적 렌즈를 이용한 자동 밀도 측정 시스템

이응주,현기호,정인갑,Lee, Eung-Joo,Hyun, Eung-Joo,Jeong, In-Gab 한국정보처리학회 1998 정보처리논문지 Vol.5 No.1

The density of fabric is a very important parameter in many fabric production processes. However, in the textile fabrication factories, textile density measurement process has been done inefficiently by handicraft. Thus, exact textile density measurement process is necessary to fabricate high quality textile through weft straighten. In this paper, we propose an automatic textile density measurement system to measure textile density automatically and to improve fabrication efficiency. The proposed system uses cylindrical lens to optically scan the weftl information of the fabric as well as convex lens to enlarge the weft images. The proposed system improves textile quality and provides constant density value to the whole textile range in the high speed fabrication process. 직물의 밀도를 측정하는 작업은 직물 제직 공정에서 매우 중요한 사항이나 일반적으로 직물 제직 공장에서는 고속의 제직 라인에서 수작업에 의해 비효율적으로 행해지고 있다. 따라서 직물 제직 공정에서 직물의 포목 교정을 통해 고품질의 직물을 생산하기 위해서는 정확한 밀도 측정 과저잉 필수적인 사항이다. 본 논문에서는 고속의 제직 공정에서 광학적인 실린더 렌즈를 이용하여 직물의 위사 정보를 검출한 후 밀도 측정을 자동화함으로써 양질의 직물 생산과 직물 생산 효율을 극대화하고자 자동 밀도 측정 시스템을 제안하였다. 제안한 자동 밀도 측정 시스템은 고속의 직물 제직 공정에서 직물의 전체 영역에 걸쳐 일정한 밀도를 유지시켜 고품질의 직물 생산을 가능하게 하였다.

비전이 거세저항성 전립선암

권택민(Taekmin Kwon),정인갑(In Gab Jeong) 대한비뇨기종양학회 2013 대한비뇨기종양학회지 Vol.11 No.1

Most men with advanced prostate cancer respond to various types of androgen ablation but eventually progress to castration-resistant prostate cancer (CRPC). However, many patients will have an increase in prostate specific antigen (PSA) on hormonal therapy without radiographic evidence of disease. For this reason, heterogeneous population of non-metastatic CRPC (non-mCRPC) has appeared. To date, PSA kinetics is the most powerful indicator of aggressiveness in that population and can be used to trigger imaging investigation and enrollment in clinical trials. Although CRPC remains largely driven by the androgen receptor, the benefit of second-line hormonal manipulations, including first generation antiandrogens, adrenal synthesis inhibitors and steroids, is clearly limited. Several registered and near to come treatments have not been tested in that population but in men with more advanced metastatic and often symptomatic disease. Several agents have been investigated to delay the onset of the first bone metastasis but only one, denosumab, has reached its end-point. But, overall survival did not differ. Physicians should recognize that non-mCRPC is an extremely heterogeneous stage of the disease, with most patients progressing slowly to a metastatic stage and acknowledge that the available registered treatments have been studied in far more advanced stage of the disease.

림프절 전이 방광암에서 림프절 관련 인자들의 예후 가치

유상준(Sangjun Yoo),정인갑(In Gab Jeong) 대한비뇨기종양학회 2015 대한비뇨기종양학회지 Vol.13 No.2

In spite of multidisciplinary treatment, about 70% of lymph node (LN) positive bladder cancer reported to be recurred within 5-year after radical cystectomy and pelvic lymphadenectomy although considerable number of patients survived for a long period without adjuvant treatment after surgery. Current TNM nodal staging system doesn’t account for this survival differences. In this regard, several LN-related parameters were developed to predict prognosis of LN positive bladder cancer. In this article, we will state the controversies on current TNM nodal staging system for bladder cancer. In addition, we will review the accuracy of imaging studies to predict LN metastasis before surgery and impact of several surgical and pathologic LN-related parameters, such as extent of lymphadenectomy, number of removed LNs, number of metastatic LNs, LN density, extracapsular extension of LN, on prognosis of LN positive bladder cancer. Moreover, we will review the value of adjuvant chemotherapy on LN positive bladder cancer.

Utility of Urinalysis as a Follow-up Surveillance Tool in Nonmuscle Invasive Bladder Cancer

Minuk Park(박민욱),Bumjin Lim(임범진),Dalsan You(유달산),In Gab Jeong(정인갑),Cheryn Song(송채린),Bumsik Hong(홍범식),Choung-Soo Kim(김청수),Hanjong Ahn(안한종),Jun Hyuk Hong(홍준혁) 대한비뇨기종양학회 2021 대한비뇨기종양학회지 Vol.19 No.4

Purpose: To evaluate the association between microscopic hematuria (MH) detected by surveillance urinalysis and cancer recurrence in nonmuscle invasive bladder cancer (NMIBC) patients. Materials and Methods: A total of 1,082 NMIBC patients who underwent transurethral resection of bladder tumor (TURB) procedures at Asan Medical Center between January 2017 and December 2019 were included. We retrospectively reviewed the follow-up data for these cases including cystoscopy, urinalysis, and urine cytology. The association between urine testing and cancer recurrence was assessed by both univariable and multivariable logistic regression analysis. Results: The study patients had a median age of 68 years (interquartile range, 60–75 years) and comprised 898 men and 184 women. Among the 1,428 TURB procedures conducted in this series, 548 of the lesions (38.4%) were diagnosed as low-grade and 880 (61.6%) as high-grade cancers. A total of 3,309 follow-up cystoscopies were conducted during the study period and were divided into high-grade (HG) (2,011 cases) and low-grade (LG) (1,298 cases) groups according to the latest TURB pathology. MH was found to have a statistically significant association with NMIBC recurrence in both the LG (odds ratio [OR], 1.57; 95% confidence interval [CI], 1.107–2.223; p=0.011) and HG (OR, 1.90; 95% CI, 1.434–2.517; p<0.001) groups. Conclusions: Urinalysis during follow-up may provide important information on cancer recurrence in NMIBC patients.

고속의 직물 제직 공정에서 광학적 렌즈를 이용한 자동 밀도 측정 시스템

이응주(Lee Eung Joo),현기호(Hyun Ki Ho),정인갑(Jeong In Gab) 한국정보처리학회 1998 정보처리학회논문지 Vol.5 No.1

The density of fabric is a very important parameter in many fabric production processes. However, in the textile fabrication factories, textile density measurement process has been done inefficiently by handicraft. Thus, exact textile density measurement processes is necessary to fabricate high quality textile through weft straighten. In this paper, we propose an automatic textile density measurement system to measure textile density automatically and to improve fabrication efficiency. The proposed system uses cylindrical lens to optically scan the weft information of the fabric as well as convex lens to enlarge the weft images. The proposed system improves textile quality and provides constant density value to the whole textile range in the high speed fabrication process.

Risk Factors Leading to Radical Cystectomy in Patients Who Had Undergone Nephroureterectomy

Janghui Lee(이장희),Bumjin Lim(임범진),Dalsan You(유달산),In Gab Jeong(정인갑),Cheryn Song(송채린),Jun Hyuk Hong(홍준혁),Choung-Soo Kim(김청수),Hanjong Ahn(안한종),Bumsik Hong(홍범식) 대한비뇨기종양학회 2021 대한비뇨기종양학회지 Vol.19 No.4

Purpose: To identify the risk factors leading to radical cystectomy in patients who had undergone nephroureterectomy (NUx). Materials and Methods: We retrospectively reviewed the medical records of patients with upper tract urothelial carcinoma who underwent NUx during 2011–2019 and excluded patients with metastatic cancer. In total 646 patients were included in this study; of these, 532 had no previous bladder cancer history. Follow-up was performed every 3 months for 2 years after NUx was administered, and recurrence was confirmed using cystoscopy, urine cytology, computed tomography, and chest radiography. Bladder recurrence was confirmed through biopsy, urine cytology, or radiologic examination. Univariate and multivariate Cox regression analyzes were performed for statistical analysis of risk factors leading to radical cystectomy in patients undergoing NUx. Results: Lymphovascular invasion (LVI) (hazard ratio [HR], 4.728; 95% confidence interval [CI], 1.463–15.570; p=0.011), previous transurethral resection of bladder tumor history (HR, 3.825; 95% CI, 1.164–12.571; p=0.027), and intravesical recurrence (IVR) within 6 months (HR, 3.733; 95% CI, 1.091–12.778; p=0.036) in patients undergoing NUx are predictors of radical cystectomy implementation. In a multivariate analysis of patients without bladder cancer history, bladder recurrence was identified as a predictor of radical cystectomy implementation, if it occurred within 6 months of NUx (HR, 8.608; 95% CI, 1.545–47.976; p=0.014). Conclusions: LVI and IVR within 6 months and previous bladder cancer history are factors that can predict the need for radical cystectomy after NUx. Even in patients without bladder cancer history, early bladder recurrence within 6 months is a major predictor of radical cystectomy.

광 센서를 이용한 TV 화상의 색 향상

이응주(Eung-Joo Lee),김경만(Kyeong-Man Kim),박양우(Yang-Woo Park),정인갑(In-Gab Jeong),하영호(Yeong-Ho Ha) 한국방송·미디어공학회 1995 한국방송공학회 학술발표대회 논문집 Vol.1995 No.-

RGB 공간상의 국부 영역 블럭을 이용한 칼라 영상 양자화

박양우(Yang-Woo Park),이응주(Eung-Joo Lee),김기석(Gi-Seok Kim),정인갑(In-Gab Jeong),하영호(Yeong-Ho Ha) 한국방송·미디어공학회 1995 한국방송공학회 학술발표대회 논문집 Vol.1995 No.-

Construction of a Retrospective Cohort to Observe 10-Year Urologic Cancer Treatment Trends at the Biggest Medical Center of South Korea

Se Young Choi(최세영),Ho Heon Kim(김호헌),Bumjin Lim(임범진),Jong Won Lee(이종원),Young Seok Kim(김영석),Jeong Kon Kim(김정곤),Jae Lyun Lee(이재련),Yong Mee Cho(조영미),Dalsan You(유달산),In Gab Jeong(정인갑),Cheryn Song(송채린),Jun 대한비뇨기종양학회 2021 대한비뇨기종양학회지 Vol.19 No.4

Purpose: To construct a urologic cancer database using a standardized, reproducible method, and to assess preliminary characteristics of this cohort. Materials and Methods: Patients with prostate, bladder, and kidney cancers who were enrolled with diagnostic codes in the electronic medical record (EMR) at Asan Medical Center from 2007–2016 were included. Research Electronic Data Capture (REDCap) was used to design the Asan Medical Center-Urologic Cancer Database (AMC-UCD). The process included developing a data dictionary, applying branching logic, mapping clinical data warehouse structures, alpha testing, clinical record summary testing, creating “standards of procedure,” importing data, and entering data. Descriptive statistics were used to identify rates of surgeries and numbers of patients. Results: Clinical variables (n=407) were selected to develop a data dictionary from REDCap. In total, 20,198 urologic cancer patients visited our institution from 2007–2016 (bladder cancer, 4,616; kidney cancer, 5,750; prostate cancer, 10,330). The overall numbers of patients and surgeries increased over time, with robotic surgeries rapidly growing over a decade. The most common treatment for urologic cancer was surgery, followed by chemotherapy and radiation therapy. Conclusions: Using a standardized method, the AMC-UCD fosters multidisciplinary research. This constructed database provides access to clinical statistics to effectively assist research. Preliminary data should be refined through EMR chart review. The successful organization of data from 2007–2016 provides a framework for future periods of investigation and prospective models.