Mask R-CNN을 이용한 영상 배경 변환 시스템의 설계 및 구현

이삭(Sac Lee),김윤서(Yun-Seo Kim),이현우(Hyunwoo Lee),김원빈(Wonvin Kim) 한국정보통신학회 2023 한국정보통신학회논문지 Vol.27 No.12

게이머의 게임 행위와 시간에 대한 연구

곽이삭(E-Sac Gwak) 한국게임학회 2017 한국게임학회 논문지 Vol.17 No.4

본 연구는 게임에서의 시간에 대한 내용을 담고 있다. 게임의 시간에 대한 연구는 제스퍼 주울(Juul, 2004)을 비롯한 여러 학자들을 통해 진행된 바 있으며, 기존의 연구들이 현실의 시간 개념을 기준으로 게임의 시간을 내재적 시간과 외재적 시간을 분리하여 다루고 있음을 먼저 확인하였다. 이 가운데 본 연구는 관찰자적 시간으로 게임의 내재적 시간을 고찰하고자 하는데, 이는 게임에서 가장 중요한 부분이 현실과 게임의 시간적 관계성 보다는 게임성 즉, 플레이이며 더 나아가 경험에 있다고 보기 때문이다. 따라서 본 연구는 게임의 내재적 시간을 "지향적 시간"과 "비지향적 시간"으로 분류하고 그 시간들이 게이머의 경험에서 어떤 작용을 하는지 살펴보고자 하였다. This paper presents an investigation into time in games. Many researchers have studied time in games including Jesper Juul (2004), arranging time in games according to the criterion of the concept of time in reality. Most of this research distinguishes internal time from external time in games. The present study, thus, examined internal time in games from the viewpoint of the observer, believing that the most important element of the game was gameness or play and further experience rather that the relationship between reality and games. Thus, the investigator classified internal time in games into "oriented time" and "non-oriented time" and examined the operation of those time classification in the gamers" experiences.

Characteristics of Children with Acute Carbon Monoxide Poisoning in Ankara: A Single Centre Experience

Rukiye Unsal Sac,Medine Ayşin Taşar,Yurda Şimşek,İlknur Bostancı,Yıldız Bilge Dallar 대한의학회 2015 Journal of Korean medical science Vol.30 No.12

The purpose of the study was to define characteristics of children with acute carbon monoxide poisoning. Eighty children hospitalized with acute carbon monoxide poisoning were recruited prospectively over a period of 12 months. Sociodemographic features, complaints and laboratory data were recorded. When the patient was discharged, necessary preventive measures to be taken were explained to parents. One month later, the parents were questioned during a control examination regarding the precautions that they took. The ages of the cases were between one month and 16 yr. Education levels were low in 86.2% of mothers and 52.6% of fathers. All families had low income and 48.8% did not have formal housing. The source of the acute carbon monoxide poisoning was stoves in 71.2% of cases and hot-water heaters in 28.8% of cases. Three or more people were poisoned at home in 85.1% of the cases. The most frequent symptoms of poisoning were headache and vertigo (58.8%). Median carboxyhemoglobin levels at admission to the hospital and discharge were measured as 19.5% and 1.1% (P < 0.001). When families were called for re-evaluation, it was determined that most of them had taken the necessary precautions after the poisoning incident (86.3%). This study determined that children with acute childhood carbon monoxide poisoning are usually from families with low socioeconomic and education levels. Education about prevention should be provided to all people who are at risk of carbon monoxide poisoning before a poisoning incident occurs.

게임에서 죽음에 따른 게임 행위 변화

곽이삭(E Sac Gwak) 한국디지털콘텐츠학회 2019 한국디지털콘텐츠학회논문지 Vol.20 No.1

Determination of gold and palladium in environmental samples by FAAS after dispersive liquid–liquid microextraction pretreatment

Cos¸ kun O¨ zdemir,S¸ erife Sac¸macı,SenolKartal,Mustafa Sac¸macı 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6

A new dispersive liquid–liquid microextraction (DLLME) method is proposed for rapid separation,simultaneous extraction and preconcentration of gold and palladium at ultra trace amounts. Theextraction of the analytes was performed in the presence of 5-[(E)-(2,6-diaminopyridine-3-yl)diazenyl]-1,3,4-thiadiazole-2-thiol (DAT) as chelating agent. Chloroform and acetone were used as extraction anddispersive solvents, respectively. The variables affecting the complexation and extraction conditionswere optimized. The calibration curves were linear in the range of 1.1–85 and 0.9–124 mg L-1 with thedetection limits of 0.4 and 0.6 mg L-1, and with the enrichment factors of 94 and 113 for Au and Pd,respectively. The precision (RSD%) was better than 2.4%. The accuracy of the method was verified byanalysing the certified standard reference material (CDN–PGMS-10). The results show that thedispersive liquid–liquid microextraction pretreatment is a sensitive, rapid, simple and safe method forthe separation/preconcentration of gold and palladium.

Efficient Large Dataset Construction using Image Smoothing and Image Size Reduction

Jaemin HWANG,Sac LEE,Hyunwoo LEE,Seyun PARK,Jiyoung LIM 한국인공지능학회 2023 인공지능연구 (KJAI) Vol.11 No.1

With the continuous growth in the amount of data collected and analyzed, deep learning has become increasingly popular for extracting meaningful insights from various fields. However, hardware limitations pose a challenge for achieving meaningful results with limited data. To address this challenge, this paper proposes an algorithm that leverages the characteristics of convolutional neural networks (CNNs) to reduce the size of image datasets by 20% through smoothing and shrinking the size of images using color elements. The proposed algorithm reduces the learning time and, as a result, the computational load on hardware. The experiments conducted in this study show that the proposed method achieves effective learning with similar or slightly higher accuracy than the original dataset while reducing computational and time costs. This color-centric dataset construction method using image smoothing techniques can lead to more efficient learning on CNNs. This method can be applied in various applications, such as image classification and recognition, and can contribute to more efficient and cost-effective deep learning. This paper presents a promising approach to reducing the computational load and time costs associated with deep learning and provides meaningful results with limited data, enabling them to apply deep learning to a broader range of applications.

슈투트가르트대학교 학생기숙사

BAEK Architekten,서울건축(SAC International) 현대건축사 2021 월간 CONCEPT Vol.- No.266

Validation of posturography analysis in patients undergoing surgery for chronic ankle instability

Byung Min Yoo,I Sac Kim,이성현 대한정형외과 스포츠의학회 2022 Arthroscopy and Orthopedic Sports Medicine Vol.9 No.2

Background: Evaluation of the function of patients with chronic ankle instability (CAI) in clinical settings is important not only to identify the damage severity but also to evaluate the treatment effectiveness and prevent recurrence. However, objective diagnostic indicators for evaluating the functional stability of CAI are uncommon. This study aimed to determine the validity of the posturography test as an objective indicator of functional instability in relation to the Foot and Ankle Outcome Score (FAOS) and modified Star Excursion Balance Test (mSEBT) following the modified Broström procedure for CAI. Methods: A retrospective study was conducted on patients who underwent CAI surgery and posturography before and 1 year after surgery. The FAOS was measured as subjective result and the mSEBT as objective result. Posturography analysis using Tetrax devices was conducted to measure fall risk and general stability index. The difference between the measured fall risk and general stability index before and after surgery was compared with that between FAOS and mSEBT before and after surgery. Results: A total of 87 patients were evaluated. Their average age was 32.2 years, and the average follow-up period was 29.6 months. The differences in the fall risk before and after surgery, measured via posturography, were associated with FAOS pain, sports activities, daily life activities, quality of life, and mSEBT. In addition, the differences in the general stability index before and after surgery, measured via posturography, were associated with mSEBT. Conclusion: In the posturography, the fall risk and general stability index exhibited a weak negative correlation with mSEBT. In addition, the fall risk demonstrated a weak negative correlation with the FAOS, which is a subjective result. These findings indicate that posturography using Tetrax devices is a useful and reliable tool for the objective evaluation of the functional stability of patients with CAI.

Does Social Opinion Influence Movie Ticket Revenues?: A Case Study

Lee, Sang-Hyun,Lee, Lee-Sac,Hwang, Hyun-Seok American Scientific Publishers 2017 Advanced Science Letters Vol.23 No.3

Real-time Image Scanning System for Detecting Tunnel Cracks Using Linescan Cameras

Dong Hyun Jeong,Young Rin Kim,I-Sac Cho,Eun Ju Kim,Kang Moon Lee,Kwang Won Jin,Chang Geun Song 한국멀티미디어학회 2007 멀티미디어학회논문지 Vol.10 No.6

In this paper, real-time image scanning system using linescan cameras is designed. The system is specially designed to diagnose and analyse the conditions of tunnels such as crack widths through the captured images. The system consists of two major parts, the image acquisition system and the image merging system. To save scanned image data into storage media in real-time, the image acquisition system has been designed with two different control and management modules. The control modules are in charge of controlling the hardware device and the management modules handle system resources so that the scanned images are safely saved to the magnetic storage devices. The system can be mounted to various kinds of vehicles. After taking images, the image merging system generates extended images by combining saved images. Several tests are conducted in laboratory as well as in the field. In the laboratory simulation, both systems are tested several times and upgraded. In the field-testing, the image acquisition system is mounted to a specially designed vehicle and images of the interior surface of the tunnel are captured. The system is successfully tested in a real tunnel with a vehicle at the speed of 20 ㎞/h. The captured images of the tunnel condition including cracks are vivid enough for an expert to diagnose the state of the tunnel using images instead of seeing through his/her eyes.