풍력발전기 진동 데이터를 활용한 딥러닝 기반 고장진단기법 연구

정성목,최우진 한국정보기술학회 2022 한국정보기술학회논문지 Vol.20 No.6

In this study, a machine learning model was developed to automatically diagnose the type of failure issued to wind power generators through the selection and extraction of the characteristics of the collected vibration signals. Vibration data in this study were collected from wind power generators actually operating, and failure data for each type that actually occurred were labeled. In particular, the frequency range of feature extraction was extracted within the range within which most failures in wind power generators could be diagnosed. Vibration analysis in failure diagnosis considered that most of the vibration analysis is evaluated by pattern and vibration magnitudes in frequency domain, and artificial neural networks (ANN) were selected from various machine learning algorithms to evaluate a fault classification model using actual vibration data of wind power generators. As a result, machine learning using a vibration dataset of 9,800 was performed and the validation was performed, and the classification accuracy was 99.6%. 본 연구에서는 고장 진단을 위해 수집된 진동 신호의 특징 선택 및 추출을 통해 풍력발전기에 발생하는 고장 유형을 자동으로 진단하는 기계학습 모델의 개발을 수행하였다. 진동 데이터의 경우 실제 운영되고 있는 풍력발전기에서 수집하였고, 실제 고장으로 검증된 데이터를 고장 유형별로 레이블링하였으며, 특히 특징 추출의 경우 풍력발전기의 대부분의 고장 진단이 가능한 주파수 영역에서 추출하였다. 고장 진단에서의 진동 분석은 대부분이 주파수 영역에서의 패턴 및 진동 크기로 평가한다는 점을 고려하였으며, 여러 가지 기계학습 알고리즘 중 인공신경망(ANN, Artificial Neural Networks)을 선정하여 풍력발전기의 진동 데이터를 이용한 고장 분류 모델을 평가하였다. 9,800개의 진동 데이터셋을 이용하여 기계학습을 하고 유효성 검증을 수행한 결과, 정확도 99.6%의 분류 정확도를 가졌다.

개에서의 난소종양 2예

정성목,이충호,김완희,양정환,김대용,최민철,윤정희,이주명,권오경 한국임상수의학회 2001 한국임상수의학회지 Vol.18 No.4

Two female Yorkshire terrier was referred to Veterinary Medical Teaching Hospital, Seoul National University. In case 1, clinical signs were vomiting, anorexia and weight loss. Cystic intraabdominal mass was identified in radiographic and ultrasonographic examination. In case 2, clinical sign was abdominal distension. In radiographic and ultrasonographic examination, cellular ascites and bilateral intraabdominal masses next to kidneys were observed. Many clusters of glandular epithelial cells with anisocytosis, anisokaryosis, high N:C ratio coarse chromatin and prominent nucleoli were shown in cytologic examination of sanguineous ascites. In all two cases exploratory laparotomy was performed and enlarged ovaries were observed (Rt: 6$\times$5$\times$5 cm and Lt: 3$\times$2$\times$1 cm in case 1 and 3$\times$2$\times$1 cm bilaterally in case 2). After ovariohysterectomy histopathologic examinations were performed. Histopathologically the masses were diagnosed as ovarian adenocarcinoma and ovarian cystadenocarcinoma in case 1 and case 2, respectively. In both dogs no further chemotherapy was carried out. These two dogs had no gross evidence of tumor recurrence at the time of 3 months after tumor resection, but long-term follow-up might be needed.

扶餘 王興寺址 기와 가마 조사 성과

정성목 한국기와학회 2015 한국기와학회 연구발표회 Vol.21 No.-

Enhanced water-evaporation-induced power generation by controlling the coating process of conductive nanoparticles

정성목,김재엽 한국공업화학회 2021 한국공업화학회 연구논문 초록집 Vol.2021 No.1

개에서의 요 결석중: 품종, 성별, 발생부위, 요 검사, 및 결석성분의 비교(30예)

정성목 한국임상수의학회 2002 한국임상수의학회지 Vol.19 No.2

A retrospective analysis was performed with 30 cases of canine urolithiasis presented in the period between January and December 2001. The miniature schnauzer (6 cases), maltese (5 cases) and Shih Tzu (4 cases) had higher incidences than other breeds. Canine urolithiasis occurred from one year till 12 years, but the most prevalent age was 3 years. Urinary calculi occurred more often in males (63%) than females. The most prevalent anatomic locations of calculi were urinary bladder (8 of 22 cases) and urethra (13 of 22 cases) in males and urinary bladder (10 of 18 cases) in females. The major mineral component of calculi was struvite (72%). In male dogs, out of 15 cases, 10 cases were struvite and 5 cases were calcium oxalate uroliths. And, in female dogs, 8 of 10 cases were struvite. In some cases, mineral composition and urine pH was not matched. In conclusion, in the dogs with predisposing factors for urolithiasis, regular examination or proper diet should be added to prevent the disease. And the mineral composition of calculi should not be predicted solely by the pH or crystal component of urine.

개에서 특발성 삼차신경 마비의 전침 치료

정성목,양정환,정언승,이충호,김완희,최성천,김순영,박우람,강선미 한국임상수의학회 2001 한국임상수의학회지 Vol.18 No.1

A 3 years-old male Tosa dog was referred to Seoul National University Veterinary Medical Teaching Hospital with a history of difficulty in mastication. Clinical signs of dropped jaw, drooling, mild depression and dehydration were observed. According to history taking, physical examination, neurologic examination, complete blood count (CBC), serum chemical profile and radiography, the dog was diagnosed as idiopathic trigeminal nerve paralysis. Electroacupuncture treatment was applied to the dog on local and distal point at an interval of 7 days. Local points were GB-1 (Tong Zi Liao) of gall bladder meridian and ST-7 (Xia Guan) of stomach meridian. Distal points were PC-4 (Xi Men), PC-6 (Nei Guan) of pericardium meridian. Electrical stimulus was performed for 20 minutes at the frequency of 3 Hz, 3 Volts on ST-7. Ten days after the initial electroacupuncture treatment, clinical signs related to trigeminal nerve paralysis were almost disappeared.

양자점 광전극의 광전특성 향상을 위한 ZnS 패시베이션 층 코팅 조건에 관한 연구

정성목,김재엽 한국수소및신에너지학회 2022 한국수소 및 신에너지학회논문집 Vol.33 No.1

Quantum dots (QDs) are attractive photosensitizer candidates for application not only in solar cells but also in solar hydrogen generation. For the prepartion of highly efficient QD-sensitized photoelectrodes, it is important to reduce electron recombination at the photoanode/electrolyte interface. Here, we study on the coating condition of ZnS passivation layers on the photoanodes in QD-sensitized solar cells (QDSCs). The ZnS passivation layers are coated by successive ionic layer adsorption and reaction method, and as the cation precursor, zinc acetate and zinc nitrate are empolyed. Due to the higher pH of cation precursor solution, the ZnS loading is improved when the zinc acetate is used, compared to the zinc nitrate. This improved loading of ZnS leads to the reduced electron recombination at the surface of photoanodes and the enhaced conversion efficiency of QDSCs from 6.07% to 7.45%.

Ameroid Constrictor를 이용한 개에서의 단순 간외성 간문맥전신단락증의 치료

정성목,이충호,양정환,김완희,최민철,윤정희,이주명,권오경,남치주 한국임상수의학회 2001 한국임상수의학회지 Vol.18 No.4

A 2-year-old 4.0-kg female Shih Tzu with history of hematemesis and melena was referred to Veterinary Medical Teaching Hospital, Seoul national University for further evaluation and treatment. During physical examination, the dog revealed mild depression, dry mucous membrane and abdominal pain. Hematologic values were normal and serum chemical values showed increased serum bile acid (53.47 umol/l, preprandial), fasting serum ammonia concentration (184 g/dl), alanine transferase (98 U/L), alkaline phosphatase (871 U/L) and gamma glutamyl transpeptidase (21 U/L), and decreased blood urea nitrogen (4 mg/dl), total protein (4.1 g/dl) and albumin (1.2 g/dl). Microhepatica was shown in abdominal radiography. During the ultrasound examination, dilated tortuous vein communicating with caudal vena cava ws observed near the stomach. Intraoperative jejunal vein portography was performed during laparotomy to confirm the location and size of shunt vessel. According to history taking, physical examination, hematologic and serum chemical examination and radiographic study, it was diagnosed as single extrahepatic portosystemic shunt. The anomalous vessel (7 mm, o.d.) that enter the caudal vena cava from the left gastric vein, near the level of the diaphragm, was identified. A Ameroid constrictor (5 mm, i.d.) was applied to the shunting vessel near the caudal vena cava. Hematologic and serum chemical values recovered gradually and were revealed normal values 4 months after surgery. Four month after surgery serum bile acids concentrations were 0.56 $\mu$mol/l (preprandial) and 18.45 umol/l (postprandial). Abdominal radiograph showed normal gastric axis and it revealed normal size of the liver. Fine texture and increased echogenecity of liver and enlargement of portal vein were shown in ultrasonography. Single extrahepatic portosystemic shunt might be treated surgically using Ameroid constrictor.

조피볼락(Sebastes schlegeli) 치어 사료내 어분대체원으로서 갈색거저리(Tenebrio molitor)의 이용성

정성목,김에스더,장태호,이용석,이상민,Jeong, Seong-Mok,Kim, Esther,Jang, Tae-Ho,Lee, Yong Seok,Lee, Sang-Min 한국수산과학회 2017 한국수산과학회지 Vol.50 No.4

A feeding trial was conducted to evaluate the effects of partial replacement of fishmeal (FM) protein in a practical diet for rockfish Sebastes schlegeli juveniles with mealworm Tenebrio molitor meal (WM), in terms of growth performance, feed utilization, whole body composition and hematological parameters. Four isonitrogenous and isoenergetic diets were formulated to contain 8, 16, 24 and 32% WM (designated as WM8, WM16, WM24 and WM32). A FM-based diet without WM inclusion was used as a control. Triplicate groups of rockfish ($2.6{\pm}0.07g$) were hand fed one of the experimental diets to visual satiation twice a day for 8 weeks. Weight gain of fish fed the WM32 diet was lower than that of control. No significant differences were found in daily feed intake, feed efficiency and protein efficiency ratio. The whole-body protein content of fish fed WM0 and WM8 diets were significantly higher than that of fish fed WM32 diet. No statistical differences were observed in hematological parameters. These results indicate that WM has potential as alternative to FM in practical diets for juvenile rockfish and can be used at an inclusion level of up to 24% without having a significant negative effects on growth and feed efficiency.

A Review of Pharmacopuncture Treatment for Frozen Shoulder: A Literature Review of Clinical Trials

정성목,김성진,윤진영,이창희,심성은,김정현,구본혁,박연철,서병관,남상수,백용현 대한침구의학회 2018 대한침구의학회지 Vol.28 No.6

The objective of this study was to review clinical trials of pharmacopuncture treatment for Frozen Shoulder and to evaluate trends in this field. The literature search was performed using PubMed, the Cochrane Library, China National Knowledge Infrastructure, and 5 Korean electronic databases. A combination of “pharmacopuncture,” “acupoint injection,” “Frozen Shoulder,” “adhesive capsulitis,” and “periarthritis of shoulder” search terms were used. A total of 9 studies were included in this review. The studies were classified into herbal extract-based (5 types) and animal-based (2 types) pharmacopuncture treatment of Frozen Shoulder. There were 14 different acupoints and Ashi points used in the 9 studies. The total volume of herbal extract-based pharmacopuncture injected was usually between 2 mL and 4 mL, and for animalbased pharmacopuncture it was 1 ml. In most studies of Frozen Shoulder, pain was reduced and function was significantly improved after pharmacopuncture treatment. These results demonstrate that pharmacopuncture alleviates pain and restores function in patients with Frozen Shoulder. Further studies must be conducted on pharmacopuncture for management of Frozen Shoulder.