• ETRI Journal
• /
• 제44권4호
• /
• pp.588-598
• /
• 2022

Since multi-access edge computing (MEC) was established as a key enabler of 5G, MEC based on 5G networks (5G MEC) has been perceived as a new business opportunity for many industry players, including telecom operators. Numerous 5G MEC cooperation announcements among companies playing their respective roles in the MEC ecosystem have been recently released. However, because of cooperative and competitive relationships among key players in the MEC ecosystem and the uncertainty of 5G MEC, the announcement of 5G MEC cooperation can negatively affect the telecom operators' firm value. This study investigates the market reaction to announcements of 5G MEC cooperation for telecom operators using an event study methodology. The empirical results show that announcements of 5G MEC cooperation have a negative impact on the telecom operators' firm value. The results also show that the early deployment of 5G networks may reduce the negative impact of 5G MEC cooperation announcements by reducing uncertainty.

• 보건교육건강증진학회지
• /
• 제31권1호
• /
• pp.27-43
• /
• 2014

Objectives: The purpose of this study was to evaluate depression of mothers with children in early childhood and to identify predictors by income level. Methods: The research was conducted with 1,761 data from the 3rd wave of the Panel Study of Korean Children(PSKC) data. Independent variables were socio-demographic data, self-esteem, normative life-events, non-normative life events, parenting stress, marital conflict, social support. Data were analyzed by t-test, ANOVA, hierarchical multiple regression analysis were conducted. Results: Significant factors of depression of female in low-income were non-normative life events, parenting stress, marital conflict. In middle class, significant factors were education, birth order of children, self-esteem, normative and non-normative life events, parenting stress, marital conflict, sociable support. At last, we found that marital conflict was the biggest factor for depression of female in low-income and parenting stress was the most powerful predictor in middle class. Conclusions: Mother's depression has a enormous impacts on development of children in early childhood. Therefore It is required to prevent depression in mothers and it is important to intervene at the early stage of depression. Results of this study showed a different pattern of predictors by income level. Therefore, Intervention and services for a mother's depression should change the direction depending on the level of income.

• 항공우주시스템공학회지
• /
• 제15권4호
• /
• pp.57-63
• /
• 2021

The launch vehicle (LV) separation detection interface of the satellite, which is designed to initiate the launch and early operation phase (LEOP) for S-band data transmission and the solar array deployment after the LV separation, is one of the hazard items at the launch site. Therefore, this interface should satisfy the single-fault tolerance requirement for the range safety. In this paper, we discuss the LV separation detection interfaces for two different satellite launch configurations and propose a method to guarantee for the satellite to start the LEOP even under the emergency case such as a partial separation from the LV. Furthermore, the proposed method meets the range safety requirement of the launch site. As this method only changes the external harness configuration of the satellite, it increases the reliability of the satellite early operation without any modification of the existing internal logics to detect the separation event.

• 한국멀티미디어학회논문지
• /
• 제16권6호
• /
• pp.667-677
• /
• 2013

소셜 네트워크 서비스의 인기가 증가하면서 현재 이슈가 되는 정보를 추출하거나 증상 등을 추적하는 분석연구가 활발히 진행되고 있다. 특히 트위터에서는 트윗을 통해 이벤트 현상에 대한 반응과 사용자의 개인적인 상태 등이 잘 반영되어 트윗을 센서로 적용한 이벤트 추출이 가능하다. 최근에는 지진과 같은 재난 이벤트뿐만 아니라 사회 전반적으로 관심을 갖고 있는 질환이나 질병에 대한 사회적 신호가 질병의 확산을 조기에 감지하는데 도움을 주고 있다. 논문에서는 감기를 대상 이벤트로 지정하여 트위터로부터 수집한 정보를 감기 신호라는 사회적 신호로 간주하고 분석하였다. 추출된 감기 신호의 신뢰성을 확인하기 위해 감기 확산의 환경적 요인으로 알려진 세 가지 기후 요소와 기상청에서 제공하는 감기 기상지수와의 상관분석을 통해 변수들 사이의 상관관계를 파악한다.

• 한국IT서비스학회지
• /
• 제12권2호
• /
• pp.171-184
• /
• 2013

Frequently faced with dangerous situations, for evidentiary purpose in case of civil and criminal liability challenges, car drivers in Korea have been armed with so-called 'black boxes'; however, which are just video recorders in vehicles rather than real 'black boxes' that are equipped in the airplanes. In the United States, they are called EDRs(Event Data Recorders), more technically, which means that they record data of events happened while driving, such as velocity changes, airbags deployment, seatbelt wearing etc. just like in the airplanes. EDR technology is quickly becoming more advanced, more widely available, and less expensive; however, new concerns are emerging : the privacy of drivers. In U. S., vehicle manufacturers and insurance companies and the governmental agencies including the courts and legislatures are the main parties in terms of the EDR concerns. In order to determine the best way to regulate EDR, it is necessary to balance all the merits, such as safety, privacy, truth, justice and efficiency, to support a legal framework regulating the EDR concerns. This article, in light of the regulation of EDR and experience therof in the United States, examines EDR technology itself, particularly with respect to the automobile industry, describing its history, its current state, and trends that may change it in the future; and explains how the National Highway Transportation Safety Agency (NHTSA), legislatures, courts have approached EDR data. At the early stage of regulation on EDRs in Korea, examining U. S. legal framework and usages would help for successful establishment of legislation and regulation.

• 생물정신의학
• /
• 제2권2호
• /
• pp.193-204
• /
• 1995

Traumatic brain injury(TBI) used to be developed after a severe traumatic event. Therefore TBI usually induces acute or chronic stress reaction. I reviewed the concept, epidemiology, biological or psychosocial etiology, diagnosis and treatment of post-traumatic stress disorder (PTSD), and discussed about PTSD or stress reaction after TBI. Early evaluation and management of stress reaction after TBI are important.

• Journal of Chest Surgery
• /
• 제26권6호
• /
• pp.507-509
• /
• 1993

Esophageal perforation, regardless of the etiology, is a catastrophic event. The importances of early diagnosis and an aggressive surgical approach in the management of such a potentially lethal situation are stressed, in fact the mortality rate is directly related to the interval between perforation and initiation of treatment. We experienced a rare case of esophageal rupture caused by compressed air which produce a rupture of the colon not infrequently, which was treated successfully by an aggressive surgical approach consisting of closure of the perforation and adequate drainage.

• Clinics in Shoulder and Elbow
• /
• 제9권2호
• /
• pp.222-226
• /
• 2006

Full-thickness rotator cuff tears are relatively uncommon in the young adults. One of the pathogenesis of such tear is thought to be closely related to the specific trauma event. Favorable outcome is expected in young patient rotator cuff tears when it is diagnosed early following prompt surgical repair. However, early detection is sometimes difficult when the acute rotator cuff tear is combined with other injuries especially around the shoulder joints such as ipsilateral humerus fractures. Authors report an uncommon case of acute traumatic rotator cuff tear accompanied by the midhumerus shaft fracture in young adult.

• Imaging Science in Dentistry
• /
• 제42권1호
• /
• pp.55-60
• /
• 2012

Gorlin-Goltz syndrome is an autosomal dominant disorder principally characterized by cutaneous basal cell carcinomas, multiple keratocystic odontogenic tumors, and skeletal anomalies. This syndrome may be diagnosed early by dentist because keratocystic odontogenic tumors are usually one of the first manifestations of the syndrome. Early diagnosis and treatment are of utmost importance in reducing the severity of long term sequelae of this syndrome. This report presents a rare event of Gorlin-Goltz syndrome occurring in a 39-year-old male and his 8-year-old daughter. The clinical and investigative features of this familial disorder has been described in detail.

• 자원환경지질
• /
• 제34권6호
• /
• pp.573-581
• /
• 2001

110 earthquake parameters (origin time, epicentral location and magnitude) were determined from 533 event records between 1905 and 1942 using data mainly from the "Annual Report of the Meteorological Observatory of the Government General of Tyosen" We adopted epicentral coordinates from the original reports for 34 events and from the Japanese Central Meteorological Observatory far another .34 events. We determined epicenters for 37 events using arrival time information from the reports. We adopted 4 epicenters from the International Seismological Summary and I from the Chinese bulletin. To determine the magnitude, we applied Tsuboi (1954) formula which is currently employed by Korea Meteorological Administration (KMA) for 94 events. For 16 events, we determined magnitude from the reef)reed felt epicentral areal using the correlation equation between known magnitude and felt area.