칼슘 포스페이트 글라스 스캐폴드의 결정화

김민철,이병현,김광만,김경남,이용근 대한치과재료학회 2007 대한치과기재학회 학술대회 Vol.2007 No.11

두개골로 전이된 간 세포암 증례

김민철,이백권,이종원,오득영,안상태,서병철 대한두개안면성형외과학회 2007 Archives of Craniofacial Surgery Vol.8 No.2

Purpose: Hepatocellular carcinoma is a highly malignant disorder that carries a poor prognosis. It is a fatal disease with a high incidence, especially in areas with an already high prevalence of hepatitis types B & C. The primary sites for extrahepatic metastases include the lung and adrenal glands, while bone, especially the skull, is rarely affected. This paper notes a rare case of extrahepatic metastasis to the skull. Methods: A 62-year-old male, with a previous history of hepatitis B, developed hepatocellular carcinoma. The patient received several treatments of TACE(Transarterial chemoembolization) and PEI(Percutaneous ethanol injection) with no resolution, which prompted a hepatology follow-up. Recently, patient requested to have an enlarging mass on the forehead removed, for which an incisional biopsy was perfomed since the mass involved bone. Pathologic findings confirmed metastatic HCC. Results: The only complication encountered during the incisional biopsy was profuse bleeding from the incision site. There was some difficulty in controlling the bleeding, but hemostasis was achieved using Gelfoam. There were no postoperative complications. The patient was treated with radiotherapy and follow-up Conclusion: Patients with cranial metastasis of HCC presents with a subcutaneous mass and a headache while simple X-rays show osteolytic lesions, computed tomography studies are needed for a definitive diagnosis. Treatement options include radiotherapy, surgery and chemotherapy. In this case the patient received radiotherapy. Skull metastases should be considered in the differential diagnosis of patients who present with a subcutaneous mass and an osteolytic defect on X-ray films of the skull.

모바일 뱅킹 서비스의 수용 요인에 관한 탐색적 연구

김민철,김승욱,김희철,김민수 한국고객만족경영학회 2006 고객만족경영연구 Vol.8 No.2

................................................................................................Mobile technologies and services have become one of the inevitable parts of people's lives and mobile businesses have also been widespread. Nevertheless, there have been no such studies of mobile services in the industry and most of the studies have been concentrated on mobile Internet services. therefore, the goals of this study is to find out corporate key parts for popularizing mobile banking services by clarifying the activate method of mobile banking services and to get some tips for service providers and users. The results are following; First, Service Quality, Personal Innovativeness, Social Influence, don't influence users' Perceived Usefulness, which means that when people use mobile banking services, whether people around them use the services doesn't have a significant effect on them. Considerably, that's because mobile banking services are different from games and entertainment contents provided through cell phones that many can easily use and be affected by people around them and reference groups. Second, people use mobile banking services; when they experience the convenience and familiarity; when the service would help them work efficiently. Much of the preceding researches have dealt with service provider only and have focused on mobile Internet. In this regard, when it comes to a viewpoint that regards the mobile banking sector as a new sector of mobile businesses, this study is significant.In conclusion, mobile banking service providers should design handset interface and systems that would help people use the service more easily and familiarly and need to take account of marketing techniques that could encourage users' innovativeness and make them understand the usefulness of the service.

일본사회의 역사부정주의와 식민주의- 강제동원 부정론의 배경과 쟁점을 중심으로

김민철 한국사학회 2023 史學硏究 Vol.- No.150

This article explains the main logic and issues of denial of forced mobilization and forced labor, the historical background and origins of that logic, and analyzes historical revisionism/denialism in Japanese society from the perspective of the crisis of democracy. This article traces the background and origins of the Japanese government’s denial of forced mobilization to a deep-seated sense of colonialism in Japanese society. It demonstrates this through two Foreign Ministry reports published in 1945 and 1946, the Allied occupation of Japan, postwar Japanese war memories reconstructed in terms of a “victim consciousness,” and returned “grassroots colonizers” who were caught up in invasion and colonialism. In response, I see that there is also an awareness and effort to radically critique colonialism, albeit weakly. This article analyzes the relationship between the conservatization of Japanese society, which began in earnest in the 1990s, and historical denialism by examining Abe's history policy, the arguments of historical denialists, the “Thought War” of the 1930s, and the “History War” of the 2000s. As historical denialism at the policy level dominates the public discourse, it is also addressed in civil society, where historical denialism that denies wars of aggression and colonization, such as the denial of the Nanking Massacre and the Japanese military’s “comfort women,” the denial of the Korean-Chinese massacre during the Great Kanto Earthquake, and the denial of forced mobilization and forced labor, dominates the public discourse. It also emphasizes that historical denialism is linked to hate speech and hate crimes, which threaten democracy, and that overcoming it is a necessary task to safeguard democracy. 이 글은 강제동원·강제노동을 부정하는 주요 논리와 쟁점, 그 논리의 역사적 배경과 기원을 해명하고, 일본 사회에서 횡행하고 있는 역사수정주의/부정주의를 민주주의의 위기라는 시점에서 분석한다. 이 글은 일본정부가 강제동원을 부정하는 배경과 기원을 일본사회 저변에 깔린 식민주의의 인식에서 찾는다. 1945년과 1946년에 발간된 두 개의 외무성 보고서와 연합군의 일본 점령정책, ‘피해자적 의식’으로 재구성되는 전후 일본인의 전쟁 기억, 그리고 침략과 식민주의에 포섭되었던 귀환한 ‘풀뿌리 식민자들’을 통해 이를 증명한다. 이에 대한 대응으로 미약하지만 식민주의를 근본적으로 비판하려는 인식과 노력도 있음을 확인한다. 그리고 1990년대부터 본격화된 일본사회의 보수화 경향과 역사부정주의와의 상관성을 아베의 역사정책과 역사부정론자들의 주장, 1930년대의 ‘사상전’과 2000년대의 ‘역사전’ 등을 통해 분석한다. 정책 차원에서의 역사 부정론이 공적 담론을 주도함에 따라 시민사회에서도 남경대학살과 일본군‘위안부’ 부정을 필두로 관동대지진 때의 조선인·중국인 학살 부정, 강제동원·강제노동 부정 등 침략전쟁과 식민지 지배를 부정하는 역사부정론이 공론장을 지배하고 있음을 다룬다. 또한 역사부정주의가 혐오표현·혐오범죄와 연결되어 민주주의를 위협하고 있어, 이를 극복하는 일이 민주주의를 지키기 위해서도 필요한 과제임을 강조한다.

상사의 창의성 독려가 창의성 및 발언에 미치는 영향 - 창의적 과정 참여의 매개효과 -

김민철,손승연 한국인적자원관리학회 2020 인적자원관리연구 Vol.27 No.2

Organizations that fail to adapt to rapidly changing social changes are hard to survive. For the success of the organizations, many studies have been conducted by presenting creative and innovative actions for change in terms of individual tasks as members' actions for creative organization building. Previous studies have shown that a leader's encouraging of creativity has a significant impact not only on the behavior of its members but also on the organization's desirable goals. Despite these efforts, however, previous studies related to encouraging the creativity of leaders have some limitations. To compensate for these deficiencies, this study was carried out with the following three objectives. First, we want to investigate empirically the relationship between the leader's encouragement of creativity and creativity, and leader’s same behavior-voice relation(i.e., promotive voice and prohibitve voice). Through this, it was intended to contribute to the expansion of research areas for encouraging creativity. Second, it is to verify the role of the creative process engagement in the relationship between leader's encouragement of creativity and creativity, and in the leader's encouragement of creativity-voice relation. By doing this, we hope to broaden our understanding of the influence process of encouraging creativity of leaders. Third, we verified the indirect effect of the leader's encouragement of creativity on creativity and voice through creative process engagement. Especiall, we explore whether the indirect influence exist when controlling the effect of creative self-efficacy of a focal employee. Through this, it was intended to suggest that not only self-efficacy but also encouragement of creativity by leaders are important factors in creativity and voice behavior improvement. In order to test the hypotheses, 181 pairs of sergeant or higher officers belonging to the military were surveyed and hierarchical multiple regression analysis was conducted. The empirical analysis showed that the leader's encouragement of creativity has a significant impact on the creativity and two types of voice of the employees, and that creative process engagement of employee completely mediate this relationship. This study has verified that leader's encouragement of creativity is very important for enhancing member's creativity and voice beyond beyond individual characteristic factors (i.e., creative self-efficacy). And this results empirically verifies the inherent mechanism between leader's encouragement of creativity and creativity, and leader's same behavior-voice relation. This study also provide theoretical contribution and practical implications. Limitations and future research directions were proposed at the end of the study. 급격한 환경적 변화에 적응하지 못하는 조직은 생존하기 어렵다. 그에 따라 조직의 성공 및 번영을 위해 구성원들의 도전적, 창조적 개선 및 혁신 행동의 중요성이 점차 부각되고 있다. 이런 이유로 다양한 요인들이 구성원의 재량적 행동인 창의성 및 발언의 독립변수로 제시되어 왔다. 본 연구는 이론 및 실무적인 중요성 및 변수간 관계의 밀접성에도 불구하고 선행연구에서 제한된 관심을 받아 온,상사의 창의성 독려를 선택하여 구성원의 창의성 및 발언에 미치는 영향을 살펴보았다. 이 과정에서 기대이론을 활용하여 상사의 창의성 독려가 창의성 및 발언에 대한 성공 기대, 재량적 행동 관련 보상에 대한 기대를 높일 수 있을 것이라고 보고 이를 실증하고자 하였다. 또한 상사의 창의성 독려가 구성원의 창의성 및 발언을 높이는 이유가 무엇보다도 구성원의 창의적 과정에의 참여 정도를 높이기 때문이라고 보고, 이를 통한 간접효과를 확인하고자 하였다. 육군 간부 181쌍을 대상으로 설문조사를 실시하여 분석한 결과, 상사의 창의성 독려는 구성원의 창의성을 높이는 것으로 나타났으며, 촉진적 및 예방적 발언 또한 높인다는 것을 알 수 있었다. 특히 이 과정에서 창의적 자기효능감을 통제하여, 창의성 및 발언에 미치는 상사 창의성 독려의 증분 효과를 확인하였다. 또한 부트스트래핑에 의한 간접효과 검증을 실시한 결과, 상사의 창의성 독려는 구성원의 창의적 과정 참여에 정적 영향을 미치고, 이는 다시 구성원의 창의성 및 발언에 영향을 미친다는 것을 알아냈다. 본 연구는 조직 경쟁우위의 원천인 구성원의 창의성 및 발언을 촉진하는데 무엇보다도 상사의 창의성 독려가 필요하다는 것을 제시하였다. 이는 기존 연구들에서 구성원 재량적 행동에 영향을 미치는 개인, 집단, 조직 수준의 다양한 변수들에 부가하여 재량적 또는 자발적 행동의 중요성을 강조하고 독려하는 상사의 구체적 행동이 실질적으로 중요하다는 시사점을 주는 것이다. 아울러 본 연구는 창의적 과정 참여를 택해 상사 창의성 독려의 영향력 과정에 대한 이해를 높였으며, 현장에 상사의 창의성 독려 행동의 필요성에 대한 논리적 근거를 제시하였다. 특히 본 연구는 선행연구들과는 달리 기대이론으로 변수들 간 관계를 설명함으로써 현상에 대한 새로운 관점을 소개하는 함의를 가지고 있다. 마지막으로 연구의 말미에 한계 및 향후 연구방향을 제안하였다.

Optical Characterization of Ge Quantum Dots Grown by Using Rapid Thermal Chemical Vapor Deposition

김민철,Suk-Ho Choi,C. J. Park,H. T. Oh,H. Y. Cho,Kyu Il Han,Sung Kim 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6

The optical properties of multi-stacked Ge quantum dots (QDs) grown on Si (100) by using rapid thermal chemical-vapor deposition have been studied by using photoluminescence (PL), high-resolution transmission electron microscopy (HRTEM), and atomic force microscopy (AFM). The HRTEM images demonstrate vertically ordered Ge QDs and full contrast between the Si spacer and the Ge QDs. With increasing growth temperature, the size and the height of the dots increase, but the dot density decreases, as confirmed by using AFM. The Ge QDs had a bimodal shape distribution with domes and pyramids coexisting at specific growth conditions. The two major emission bands observed in the PL spectra are attributed to non-phonon (NP) and transverse-optical (TO) phonon replica of the Ge QDs and they are blue-shifted with decreasing thickness of the Si spacer. The interdiffusion or intermixing effects of Ge QDs have been studied by annealing the samples at various temperatures. As the excitation power increases, the NP energy of the Ge QDs is shifted to higher energy, and a plot of PL intensity vs excitation power shows a sublinear behavior with powers of 0.68 and 0.75 for the NP and the TO PL peaks, respectively. The experimental results are discussed with reference to possible emission mechanisms of Ge QDs/Si.#?

Enhancement of Nonvolatile-memory Performance by Using Multiply-stacked Ge Nanodots Prepared at Room Temperature

김민철,김경중,최석호,Seung Hui Hong 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.4

One-to-three-period multilayers (MLs) of Ge nanodots (NDs) for nonvolatile memories (NVMs) have been self-assembled at room temperature by using ion beam sputtering deposition of 5-monolayer Ge between SiO2 layers. Using the structure of 4-nm tunnel oxide/Ge-ND MLs (middle oxide: 2 nm)/15-nm control oxide, were fabricated NVM metal-oxide-semiconductor (MOS) fieldeffect-transistor devices based on the 0.6-µm CMOS standard processes. The size and the distribution of the Ge NDs remained almost unchanged after the device-fabrication processes. The memory window and the program speed increased from 1.1 to 1.7 V and from 10 ms to 500 µs at +18 V, respectively, with increasing number of periods from 1 to 3. The programmed threshold voltages in the cycling behaviors were almost constant within about 0.05 V up to ∼10<SUP>4</SUP> program/erase cycles for the two- and the three-period devices. In contrast, the erased threshold voltages showed a drift-up for all devices, with the drift-up being decelerated in larger-period devices. The charge-loss rate was also reduced for larger-period devices.

Current Status of Coronary Intervention in Patients with ST-Segment Elevation Myocardial Infarction and Multivessel Coronary Artery Disease

김민철,정명호,김상형,홍영준,김주한,안영근 대한심장학회 2014 Korean Circulation Journal Vol.44 No.3

Primary percutaneous coronary intervention (PCI) is a standard interventional treatment modality for ST-segment elevation myocardial infarction (STEMI). Diagnostic coronary angiogram during PCI reveals multivessel coronary artery disease in about half of patients with STEMI, and it is difficult to make decision on the extent of intervention in these patients. Although revascularization for the infarct-related artery only is still effective for STEMI patients, several studies have reported the efficacy of multivessel revascularization during primary PCI, as well as in a staged PCI procedure. Clinicians should consider clinical aspects such as initial cardiogenic shock and myocardial viability when performing primary multivessel intervention, including the risks and benefits of multivessel revascularization in patients undergoing primary PCI. This review describes the current status of performing multivessel PCI in patients with STEMI and proposes an optimal revascularization strategy based on the previous literature.

소비자 불매운동에 따른 브랜드신뢰의 완충효과 검증: 일본 스포츠용품을 대상으로

김민철,김성환,유진호,김영수 한국스포츠산업경영학회 2022 한국스포츠산업경영학회지 Vol.27 No.4

The purpose of this study is to analyze how the boycott movement against Japan, which originated from historical hostility, had an effect on brand image, brand attitude, and purchase intention of Japanese sporting goods, and to verify the buffering effect of brand trust amid changes in consumer behaviors. For this study, a total of 366 valid samples were collected from 10 sports clubs in Gwangju Metropolitan City and Jeollanam-do. Also, for data analysis, descriptive statistics, correlation analysis, paired t-test and two-way ANOVA were conducted and the main findings of this study are as follows: first, the boycott movement against Japan was found to have negative effects on all areas of brand image, brand attitude, and purchase intention. Second, with regard to the buffering effects of brand trust on brand image, brand attitude, and purchase intention, unlike hypothesized, the results showed steeper decreases in the variables among the participants with a higher level of brand trust. In conclusion, the buffering effect of brand trust on the boycott against Japan did not appear regardless of the level of consumer trust.

경수로 사용후핵연료 연소도 및 농축도 특성 분석

김민철,정성환,강기두 한국방사성폐기물학회 2011 한국방사성폐기물학회 학술논문요약집 Vol.9 No.2