Vent의 형성이 도재전장 비귀금속합금 주조체의 변연부 적합도에 미치는 영향

김태석,이성욱,오세윤,김웅철,김지환,유진호,Kim, Tae-Suk,Lee, Sung-Uk,Oh, Sae-Yoon,Kim, Woong-Chul,Kim, Ji-Hwan,Yoo, Jin-Ho 대한치과기공학회 2001 대한치과기공학회지 Vol.23 No.1

This study was performed to investigate the effect of vent on the marginal discrepancy of PFM base metal castings. Eighteen identical wax patterns of a maxillary 3 unit anterior bridge were fabricated. Nine cases out of them were vented with $\phi$2.5mm sprue wax, for direct comparison as to the marginal discrepancy of the castings with the other non vented 9 ones. The mean value of marginal discrepancies of the vented castings was $85.02{\pm}25.57{\mu}m$, and that of the non vented was $163.21{\pm}69.88{\mu}m$ respectively. Statistical analysis revealed that marginal discrepancy of the vented casting was significantly reduced(p<0.05).

여성 섬유근육통 환자의 기질 및 성격 특질

김태석,김경태,정영은,박성환,이철,Kim, Tae-Suk,Kim, Kyung-Tae,Jung, Young-Eun,Park, Sung-Hwan,Lee, Chul 한국정신신체의학회 2007 정신신체의학 Vol.15 No.1

Objectives: previous studies have suggested the possible predisposing personality in fibromyalgia(FM). The aim of this study is to investigate the personality traits in female patients with FM compared to healthy female controls using the Temperament and Character Inventory(TCI) and furthermore, to evaluate the personality traits affecting the severity of the symptoms of FM. Methods Forty female patients with FM and 40 healthy female controls were examined using the TCI and the Hamilton depression rating scale. The FM patients were also evaluated the severity of the symptoms of FM using the fibromyalgia impact questionnaire(FIQ). Results : ANCOVA with age and depression levels as covariates showed that the FM patients scored significantly higher on the harm avoidance(F=2.187, p=0.047) and lower on the self-directedness(F=4.551, p=0.036) than the healthy controls. The FIQ scores showed positive correlation with the harm avoidance scores in the FM patients when adjusting for age and depression level(R=0.399, p=0.013) Multiple linear regression models revealed that the harm avoidance scores would affect the FIQ scores in FM patients(95% Cl=0.004-1.942, p=0.049). Conclusions : These results suggest that the female FM patients have distinctive temperament and character dimensions compared to the healthy female controls. Moreover, the harm avoidance may be the predictive personality to affect the severity of the symptoms of female FM patients.

비소와 중금속으로 오염된 광미의 정화

김태석(Tae Suk Kim),김명진(Myoung Jin Kim) 大韓環境工學會 2008 대한환경공학회지 Vol.30 No.8

외래에서 고민하는 만성 바이러스성간염 환자 증례

김태석 ( Tae Suk Kim ) 대한간학회 2023 간질환 연수강좌 Vol.2023 No.1

클릭률 예측 성능 향상을 위한 다중 배열 CNN 모형 설계

김태석(Tae-Suk Kim) 한국콘텐츠학회 2020 한국콘텐츠학회논문지 Vol.20 No.3

클릭률(CTR) 예측은 사용자가 주어진 항목을 클릭할 확률을 추정하는 것으로 온라인 광고 수익 극대화를 위한 전략 결정에 중요한 역할을 한다. 최근 CTR 예측을 위해 CNN을 활용하는 시도가 이루어지고 있다. CTR 데이터는 특징 정보가 연관성 측면에서 의미 있는 순서를 갖지 않기 때문에, 임의의 순서로 배열될 수 있다. 하지만 CNN은 필터 사이즈에 의해 제한된 로컬 정보만을 학습하기 때문에 데이터 배열이 성능에 큰 영향을 줄 수 있다. 이 논문에서는 CNN이 수집할 수 있는 모든 로컬 특징 정보를 추출할 수 있는 데이터 배열 집합을 생성하고 생성된 배열들에 대하여 개별 CNN 모듈들이 특징들을 학습할 수 있는 다중 배열 CNN 모델을 제안한다. 대규모 데이터 세트에 대한 실험 결과에 따르면 제안된 모델은 기존 CNN 대비 AUC의 RI에서 22.6% 상승 효과를, 제안된 배열 생성 방법은 임의 생성 방법보다 3.87% 성능 향상을 달성하였다. Click-through rate (CTR) prediction is an estimate of the probability that a user will click on a given item and plays an important role in determining strategies for maximizing online ad revenue. Recently, research has been performed to utilize CNN for CTR prediction. Since the CTR data does not have a meaningful order in terms of correlation, the CTR data may be arranged in any order. However, because CNN only learns local information limited by filter size, data arrays can have a significant impact on performance. In this paper, we propose a multi-array CNN model that generates a data array set that can extract all local feature information that CNN can collect, and learns features through individual CNN modules. Experimental results for large data sets show that the proposed model achieves a 22.6% synergy with RI in AUC compared to the existing CNN, and the proposed array generation method achieves 3.87% performance improvement over the random generation method.

사물인터넷 환경을 위한 IEEE 802.15.4 프로토콜 모델링과 최적화 방안

김태석(Tae-Suk Kim) 한국콘텐츠학회 2016 한국콘텐츠학회논문지 Vol.16 No.10

본 논문에서는 사물인터넷 환경에서 사용되는 저전력 통신 기술인 IEEE 802.15.4 MAC (Media Access Control) 프로토콜의 성능 분석을 수행한다. 사물인터넷 환경에서는 기기 종류가 다양하고 생성되는 트래픽 특성도 상이하기 때문에 기존 연구와는 달리 트래픽이 혼재되어 있는 heterogeneous traffic 환경을 고려한다. 마코프 체인을 통해 프로토콜의 성능을 MAC 파라미터의 함수로 도출하였고 이를 기반으로, 사용되고 있는 애플리케이션을 위한 에너지 효율적인 최적 MAC 파라미터를 실시간으로 찾는 프레임워크를 설계하였다. 제안 방식은 기존의 파라미터를 고정시켜 운용하는 방법 대비 에너지 이득이 있음을 애플리케이션 시나리오별 비교를 통해 보였고, 제안된 프레임워크가 연산 능력의 한계를 가지는 소형 기기에서도 충분히 사용될 수 있음을 정확도와 속도 측면에서 검증하였다. In this paper, we perform analysis of the performance of low-power communication technology, IEEE 802.15.4 MAC (Media Access Control) protocol used in internet of things. Wide variety of devices in internet of things generate different kinds of traffic characteristics and heterogeneous traffic environment is therefore considered in contrast to existing works. With the help of the Markov chain the performance of the protocol is derived as a function of the MAC parameters and based on the results a framework to determine energy-efficient optimal MAC parameters for applications in real time is proposed. Proposed method is shown to be more efficient in terms of energy consumption through performance comparison over application scenarios compared to operation with fixing MAC parameters, and its practicability on small devices with limited computing power is verified through evaluating the accuracy and speed of the proposed framework.

비미란성 역류 질환

김태석 ( Tae Suk Kim ),박성철 ( Sung Chul Park ),이성준 ( Sung Joon Lee ) 대한내과학회 2015 대한내과학회지 Vol.88 No.1

Nonerosive reflux disease (NERD) is a distinct presentation of gastroesophageal reflux disease (GERD). NERD is commonlydefined as the presence of classical GERD symptoms in the absence of esophageal mucosal erosions/breaks on upper endoscopy. Within the spectrum of GERD, the pathophysiological and clinical characteristics distinguishing NERD and erosive esophagitis remaina matter for debate. Recent research on NERD has focused on understanding the pathophysiology and natural history. Giventhe increased incidence of NERD in Korea, we reviewed the concept of NERD and its relationship to GERD and functional gastrointestinaldisorders.

배치 트래픽 특성을 고려한 IEEE 802.15.4 비경합구간 성능 모델링 및 평가

김태석(Tae-Suk Kim),최덕현(Duke Hyun Choi) 한국콘텐츠학회 2016 한국콘텐츠학회논문지 Vol.16 No.11

본 논문에서는 저전력 통신 기술인 IEEE 802.15.4 MAC (Media Access Control) 프로토콜에서 지원하는 Collision Free Period(CFP)에서의 전송 성능 분석을 수행한다. 분석을 위해 CFP의 서비스 타겟인 주기적 트래픽을 고려하고 Quality of Service 요구사항에 따라 MAC 계층에 전달되는 패킷전달 형태를 batch와 non-batch로 구분하여 throughput, delay, energy 측면에서 성능을 분석한다. 도출된 분석 결과를 토대로 Pedometer, ECG, EMG와 같이 주기적인 트래픽을 생성하는 헬스케어 애플리케이션에 대해 Collision Avoidance Period(CAP)에서의 전송과 성능 비교를 수행한다. 성능 평가를 통해 헬스케어와 같이 주기적이며 time-critical 트래픽을 생성하는 애플리케이션은 CFP 전송이 에너지 효율적이며 대역폭 요구 사항이 큰 애플리케이션에서는 CAP 대비 최대 46%의 에너지가 절감됨을 확인하였다. In this paper, we performed the analysis of transmission performance for Collision Free Period(CFP) supported by the low-power communication technology, IEEE 802.15.4 MAC (Media Access Control). For the analysis, periodic traffic, original service target of CFP, is considered and, according to the Quality of Service required, packet arrival pattern to MAC layer is categorized as batch and non–batch, and analysis on throughput, delay, and energy is performed for those patterns. On the basis of the obtained analysis, performance comparison with Collision Avoidance Period(CAP) is carried out for the health care applications that generate periodic traffic such as Pedometer, ECG, EMG. The evaluation confirms that CFP is more energy efficient for healthcare applications that generate periodic and time-critical traffic and moreover for the application with high bandwidth requirement CFP achieves up to 46% energy savings compared to CAP.

사물인터넷(IoT)과 추천시스템

김태석(Tae-Suk Kim) 한국콘텐츠학회 2017 한국콘텐츠학회지 Vol.15 No.3

급성 신부전이 합병된 전신다한증

김태석 ( Tae Suk Kim ),강명호 ( Myung Ho Kang ),임경리 ( Kyoung Ree Lim ),이상훈 ( Sang Hoon Lee ),이원호 ( Won Ho Lee ),허정원 ( Jeong Won Heo ),오원섭 ( Won Sup Oh ) 대한내과학회 2012 대한내과학회지 Vol.82 No.4

Hyperhidrosis is a disorder characterized by perspiration in excess of the physiologic amount necessary to maintain thermal homeostasis. It is categorized as either a primary condition or a condition occurring secondary to a number of diseases and the use of prescribed drugs and is further classified according to anatomical distribution as being focal, regional, or generalized. Severe generalized hyperhidrosis is extremely rare but significantly inhibits social activities in those affected. A 48-year-old female with oliguria was admitted to our hospital. Both a physical examination and a starch-iodine test showed generalized hyperhidrosis, suggesting that excessive loss of body fluid via sweating had led to prerenal acute renal failure (ARF). To our knowledge, severe cases of generalized hyperhidrosis causing ARF have not previously been reported. The present case is reported with a review of the literature on the etiology and management of generalized hyperhidrosis. (Korean J Med 2012;82:497-502)