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김영현,리상섭 한국교육컨설팅코칭학회 2023 교육컨설팅코칭연구 Vol.7 No.1
This study aims to investigate how university students' self-leadership affects institutional commitment by using their self-efficacy as a mediating factor. To gather data, a web-based survey was given to students at four-year public and private universities in Seoul. The final sample size is 347, and the research findings are as follows: First, students' self-leadership positively affects their institutional commitment. Multiple regressions showed that behavior-focused strategies and natural reward strategies have a direct and positive effect on institutional commitment. Second, students' self-leadership positively affects their self-efficacy. Third, students' self-efficacy positively affects their institutional commitment. Last, students' self-efficacy mediates the relationship between self- leadership and institutional commitment. A mediator analysis showed that through self-efficacy as a mediator, all self-leadership strategies affect institutional commitment. This is the first study to examine relationships between self- leadership, self-efficacy, and institutional commitment among undergraduate students. This research has implications for the importance of increasing students' commitment to universities, self-leadership, and self-efficacy. It also gives researchers and practitioners helpful information about setting up self- leadership and self-efficacy programs to help students become more committed to their institutions and become successful and versatile self-leaders.
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소규모 이더넷 스위치에서 개선된 적응적 전력 제어 메커니즘
김영현,이성근,고진광,Kim, Young-Hyeon,Lee, Sung-Keun,Koh, Jin-Gwang 한국전자통신학회 2013 한국전자통신학회 논문지 Vol.8 No.3
이더넷은 전 세계적으로 가장 널리 배치되어 사용되는 가입자망 네트워킹 기술이다. 이더넷의 에너지 효율성을 향상시키기 위해 IEEE 802.3az WG에서 LPI 기반의 EEE 규격을 확정하였다. 본 논문은 소규모 이더넷 스위치에서 EEE 를 기반으로 에너지 효율을 향상시킬 수 있는 개선된 적응적 전력 제어 메커니즘을 제안한다. 본 메커니즘의 특징은 일정기간 유입되는 트래픽 양을 측정하여 다음 주기의 트래픽 특성을 예측하고, 해당 트래픽 부하에 최적의 threshold 값을 조정한다. 성능분석 결과는 본 논문에서 제안한 메커니즘이 기존 방법에 비해서 평균 패킷 지연은 약간 증가시키지만 에너지 소비율을 상당히 감소시키므로 전반적으로 성능을 향상시키는 것으로 나타났다. Ethernet is the most widely deployed access network protocol around the world. IEEE 802.3az WG released the EEE standard based on LPI mode to improve the energy efficiency of Ethernet. This paper proposes improved adaptive power control mechanism that can enhance energy-efficiency based on EEE from small Ethernet switch. The feature of this mechanism is that it predicts the traffic characteristic of next cycle by measuring the amount of traffic flowing in during certain period and adjusts the optimal threshold value to relevant traffic load. Performance evaluation results indicate that the proposed mechanism improves overall performance compared to traditional mechanism, since it significantly reduces energy consumption rate, even though average packet delay increases a little bit.
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김영현,박명혜,정태곤,김명수,이승배,윤종호 한국통신학회 2015 정보와 통신 Vol.33 No.1
전력산업은 오랫동안 다른 산업의 발전을 위하여 에너지를 안정적이고 또 효율적으로 공급하는 것에 집중하였다. 그러나 신기후체제 출범 이후에는 에너지산업의 혁신이라는 큰 목표를 달성하기 위해 다양한 노력을 진행하고 있다. 특히 기존의 폐쇄망으로 운영되던 전력망을 개방형, 양방향 통신망으로 업그레이드를 하고 있으며, 그 중심에는 이더넷 기술이 있다. 이더넷 기술은 높은 확장성으로 전력망에 손쉽게 적용이 가능하다. 하지만 안정성, 신뢰성 등에 대해서는 추가 고려가 필요한 상황이다. 이에 본고에서는 전력망의 요구사항을 분석하고, 이를 만족시키기 위한 이더넷 활용기술 및 활용사례에 대해 살펴보고자 한다.
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김영현,최정석,강성호,유명상 대한이비인후과학회 2012 대한이비인후과학회지 두경부외과학 Vol.55 No.6
Penetrating traumatic laryngeal injuries are relatively rare and traumatic injuries to the epiglottis are extremely rare. The present case is 58-year old man with suicidal history, chronic alcoholism, and schizophrenia who complained of neck laceration and unconsciousness after stab injury. Examination revealed a large transverse laceration of 7 cm in size, penetrating deep to the level of thyroid cartilage from the lateral border of the sternocleidomastoid muscle, exposing the thyroid cartilage. There was about a 3 cm-sized deep wound under the thyroid gland level but no major vessel injury. The stump of transected epiglottis accompanied by rupture of thyroid membrane was shown but the esophagus was intact. We sewed the amputated epiglottis with the rest of the epiglottis by using two Lambert sutures with vicryl 4-zero on each side under general anesthesia. There was no necrosis of the severed epiglottis, swallowing difficulty, and aspiration on eating food. We report here on the penetrating laceration with subtotal transection of epiglottis that was successfully repaired.
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金渶鉉 전북대학교 의과학연구소 1985 全北醫大論文集 Vol.9 No.1
The clinical observation was made with 25 cases which and psychiatric sequelae after head trauma. They had been referred to the department of neuropsychiatry from other services at the Chonbuk National University Hospital. Some clinical characteristics were as follows : Male cases outnumbered the female cases, but there were no differences in age distribution. Primary school graduates were most frequent and 68% of subjects sustained marital life. In occupational distribution, they showed a variety of jobs and 68% of them belonged to socioeconomic low class. Traffic accidents were the major cause of head traumas. Psychiatric disability was more frequent after skull fracture and intracranial hemorrhage than concussion. The diagnostic distributions were posttraumatic neurosis(28%), posttraumatic personality disorder(28%), postconcussion syndrome(12%), posttraumatic psychosis(12%), posttraumatic epilepsy(8%) and posttraumatic dementia(8%). The psychiatric sequela was more frequent in nonoperative subjects(68%) and EEG findings were abnormal in 24% of subjects. Atypical permorbid personality was observed in 48% of patients. Of the various clinical aspects, frequent symptoms were memory disturbance(60%), disorientation(40%), headache(32%), withdrawal(28%), impulsive & aggressive behavior(24%), dizziness(20%) and nervousness(20%)
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