이달의 과학자-수학연구로 과학기술발전에 공헌 포항공과대 수학과 최희준 교수

최희준,Choe, Hui-Jun 한국과학기술단체총연합회 1995 과학과 기술 Vol.28 No.1

「이달의 과학자」로 선정된 최희준교수는 물리현상 및 공학현상의 수학적 모델인 포물선형 편미분방정식과 변분부등식 해의 행태 등의 연구로 과학기술분야의 균형적 발전에 큰 공을 세웠다.

신라 하대의 쿠데타와 대외교섭

최희준 한국고대사탐구학회 2024 한국고대사탐구 Vol.46 No.-

쿠데타는 체제 내 중요 권력을 가진 인물이나 소수 그룹이 갑작스럽고 불법적인 방법으로 정부를 전복하고 권력을 장악하는 정치 행위이다. 신라 하대는 쿠데타가 자주 발생했던 시기로, 155년 동안 14차례의 쿠데타가 시도되었고, 이 중 5건이성공하여 약 35%의 성공률을 보였다. 이 시기의 성공한 쿠데타로는 780년 김양상, 785년 김경신, 809년 김언승, 838년 김명 및 김우징의 쿠데타가 있으며, 이는 주로하대 초기 60년 동안에 집중되었다. 840년대 이후의 쿠데타 시도는 모두 실패로돌아갔는데, 이는 신라 국왕들이 쿠데타에 철저히 대비했을 뿐만 아니라, 중앙귀족중심의 신라 사회가 해체되어 가는 과정에서 민중 봉기 등 다양한 방식의 저항이강화된 결과로 보인다. 쿠데타로 집권한 왕들은 대외교섭을 활발히 진행하였는데, 특히 당과의 관계를 통해 정치적 안정과 국제적 정당성을 확보하려 하였다. 관련하여 선덕왕과 헌덕왕은 즉위 초기에 대당 외교 교섭에서 전왕의 사망과 자신의 즉위 사실을 의도적으로 숨기는 비정상적인 외교 행태를 보였다. 이는 쿠데타 왕권의 정당성과 정통성 결여에 기인한 것으로, 당과의 우호적 관계를 유지하면서 통치 정당성을 확보하고자 한 전략이었다. The late period of Silla was marked by frequent coups, reflecting the internal instability and political volatility within Silla society. These events played a crucial role in shifting the power dynamics and reshaping the political order within Silla. When successful, new monarchs would actively engage in foreign diplomacy, especially strengthening relations with the Tang, as part of their efforts to overcome political instability and secure international legitimacy. Such diplomatic activities were essential for elevating Silla's international standing and establishing the legitimacy of the new monarchy both domestically and internationally. For the kings who ascended to power through coups during the late Silla period, prioritizing relations with Tang, the major power of the time, was a critical strategy in the international political environment. Friendly relations with Tang provided Silla with political support and stability, contributing to overcoming internal instability caused by coups and securing recognition and support from the international community. The dispatch of envoys to Tang by the kings who ascended through coups right after their coronation can be seen as part of this strategy, revealing Silla's intention to emphasize its legitimacy internationally and to secure internal political stability through diplomatic relations. Specifically, the use of unconventional diplomatic strategies by Kings Seondeok and Heondeok, such as intentionally concealing the news of their accession, can be interpreted as an effort to overcome the legitimacy deficit caused by the coups. The prioritization of diplomacy with Tang by the monarchs of late Silla who came to power through coups was a pragmatic choice considering Silla's position in the international political environment. The close diplomatic relations with Tang brought political stability and international support to Silla, playing a significant role in overcoming the internal instability caused by the coups. This strategy indicates Silla's efforts to secure international legitimacy and overcome the political instability resulting from the coups. On the other hand, the lack of official diplomacy with Japan suggests that Silla did not see significant benefits in diplomatic relations with Japan at the time or placed more emphasis on its relations with Tang. This indicates that Silla's foreign policy was focused on securing its position and legitimacy in the international arena, primarily through its relationship with Tang, rather than establishing formal diplomatic ties with Japan.

신라의 일본사신 영접 절차와 의례적 특징

최희준 신라사학회 2019 新羅史學報 Vol.0 No.45

Silla had their own reception ceremonies for welcoming Japanese envoys. To list these procedures of the reception in order, when the Japanese envoys arrived at the port of Ch'ŏng Province (Ch'ŏngju 菁州), their arrival was reported to Silla’s king. If the envoys’ entrance to the capital (王京) was decided, Reception Envoy (Yŏnyŏngsa 延迎使) was sent to Ch'ŏng Province and the envoy will lead the Japanese envoys to the capital. When the Japanese envoys reached to the outskirt of the capital (郊), there was welcome ceremony at the outskirt (Kyoyŏng 郊迎). Later, the envoys stayed in the guesthouse within the capital, while Silla received the state document and state-letter from Japanese emperor. In this procedure, Silla’s king sent officials in the rank of Sop'an (蘇判) or Ich'an (伊湌) to proceed the ceremony; this shows a distinct difference from the ceremony to receive the Tang emperor’s state document, since Silla’s king received the document in person. The reason Silla had a distinction in ceremonies was that they adopted the courtesy between a suzerain and vassal state’ to the Tang dynasty, while they had the ‘courtesy for a neighboring country’ to Japan. Afterward, the Japanese envoys was granted an audience with Silla’s king in the main hall, and received Silla’s return gifts before their return to Japan. At this procedure, instead of writing a reply to the Japanese state letter, Silla’s king let the Japanese envoys listen to his verbal answer and report it to Japan; this attitude was Silla’s diplomatic policy against Japan’s unilateral and continuous demands to Silla’s submission of memorial from since the eighth century, whereas maintaining their relationship with the impartial courtesy. During the Japanese envoys’ stay, Silla held parties several times for them. Accomplishing their mission after these procedures, the Japanese envoys were on their way to their homeland with the guidance and escort from Silla’s emissaries the king appointed, taking the above procedures in reverse order. 본 논문은 신라가 자국을 방문한 일본사신을 어떠한 영접 절차에 따라서 맞이하였고, 그 속에 내포된 의례상의 특징은 무엇이었는지를 구명한 결과물이다. 신라는 일본사신들을 영접하기 위한 나름의 체계화된 영접의례를 갖추고 있었는데, 이를 영접의 절차에 따라 정리하면 다음과 같다. 먼저 일본사신이 선박을 이용하여 신라의 邊關 浦口에 내착하면, 그 사실이 신라국왕에게 보고되었다. 신라국왕이 일본사신의 입경을 결정하면 사신이 대기하고 있던 내착지로 延迎使를 파견하여 王京까지 호위・인솔해 왔다. 사신이 郊에 이르면 郊迎을 베풀고 왕경 내 객관에 안치시킨 다음, 일본천황의 國書와 國信을 전달받았다. 이때 신라국왕은 蘇判이나 伊湌의 관등을 지닌 신하를 보내 의식을 진행하였는데, 이는 당황제의 국서를 신라국왕이 직접 전달받았던 점과 뚜렷한 차이를 보였다. 신라가 이 같은 영접의례 상의 차이를 둔 까닭은 당에 대해서는 ‘君臣의 禮’를 취한 반면, 일본에 대해서는 그 보다 격을 낮춰 ‘交隣의 禮’를 취했기 때문이었다. 이후 신라국왕은 일본사신을 正殿으로 불러 접견하였고, 일본사신의 귀국 전에 신라 측의 答禮品을 전달하였다. 이때 신라국왕은 答書를 작성해 전달하는 대신 일본사신에게 자신의 답변을 청취한 뒤 귀국 후 口頭로 그 내용을 보고하도록 하였다. 이는 지속적으로 ‘表文’을 요구한 일본 측의 일방적 요구에 대응하여 亢禮를 유지하면서 관계를 지속하기 위한 신라의 외교적 방책이었다. 일본사신의 체류 기간 동안 신라에서는 연회를 베풀었고, 이상의 과정을 거쳐 임무를 모두 완수한 일본사신은 신라국왕이 임명한 사자의 호위와 인솔을 받으며 입경의 역순으로 귀국길에 올랐다.

The Effect of Chlorhexidine on the formation of bone nodules by Periodontal ligament Cells in Vitro

최희준,지숙,국중기,장현선,박주철,김흥중,김종관,김병옥,Choi, Hui-Jun,Ji, Suk,Kook, Joong-Ki,Jang, Hyun-Seon,Park, Joo-Cheol,Kim, Heung-Joong,Kim, Chong-Gwan,Kim, Byung-Ock The Korean Academy of Periodontoloy 2006 Journal of Periodontal & Implant Science Vol.36 No.2

사람치주인대섬유모세포(human periodontal ligament fibroblast, PDLF)의 기능 손상과 클로르헥시딘(Chlorhexidine, CHX)의 세포독성에 관한 분자적인 기전은 최근까지도 불명확하다. 이 연구의 목적은 PDLF에 의한 골결절 형성에 있어서 CHX의 효과를 평가하고, 치주수술후에 치주병원균의 최소억제농도(minimal inhibitory concentration, MIC)를 평가하고자 하였다. CHX의 세포독성을 평가하기 위해서 MTT assay법을 실시하였다. CHX은 0.12%에서 0.00012%까지, 즉 10-1000배로 희석시킨 후 30, 60, 120초 동안 PDLF에 적용되었고, 석회화된 결절은 alizarin red 용엑에 염색되었다. 치주병원균에 대한 CHX의 MIC가 평가되었다. 이 연구 결과, 세포생존율 검사에서는, 단지 0.12% CHX 에 노출되었던 세포들만 세포 증식 소견을 다소 나타내었다. 모든 CHX 농도(0.12%-0.00012%)에서 PDLF에 의한 골결절 형성은 의미있는 감소를 나타내었다. 또한 치주병원균에 대한 CHX의 MIC는 0.0012%로 나타났다. PDLF의 골결절 형성에 영향을 주는 농도(0.00012%)는 세포독성을 나타내는 농도(0.12%)보다 더 낮은 농도를 보였고, 치주병원균의 최소억제에 필요한 농도는 0.0012%로 나타났다. 이런한 결과들은 통상적으로 상용되는CHX이 PDLF에 의한 골결절 형성에 있어서 영향을 미칠 수 있음을 시사하였다.

분리불안 의심 아동 행동분석 AI를 통한 진찰 권고 시스템

최희준,김준민,채주형,허홍,이원일 한국산업경영시스템학회 2021 한국산업경영시스템학회 학술대회 Vol.2021 No.춘계

Generating sample paths and their convergence of the geometric fractional Brownian motion

최희준,추정호,김종은 대한수학회 2018 대한수학회보 Vol.55 No.4

We derive discrete time model of the geometric fractional Brownian motion. It provides numerical pricing scheme of financial deri\-vatives when the market is driven by geometric fractional Brownian motion. With the convergence analysis, we guarantee the convergence of Monte Carlo simulations. The strong convergence rate of our scheme has order $H$ which is Hurst parameter. To obtain our model we need to convert Wick product term of stochastic differential equation into Wick free discrete equation through Malliavin calculus but ours does not include Malliavin derivative term. Finally, we include several numerical experiments for the option pricing.

Multiwalled Carbon Nanotube Reinforced Thermotropic Liquid Crystal Copolyester Nanocomposites by Simple Melt Compounding

최희준,김성훈,김준영 한국고분자학회 2008 한국고분자학회 학술대회 연구논문 초록집 Vol.33 No.1

Validation of the Learning Transfer System Inventory(LTSI) in Public and Private Organizations in Korea

최희준,박지혜 숭실대학교 한국평생교육ㆍHRD연구소 2010 평생교육 · HRD연구 Vol.6 No.3

As more organizations focus on transfer issues, the need for a valid instrument that can measure the factors affecting the transfer of training has become urgent in the HRD field. To address this need, Holton and his colleagues have developed and validated the Learning Transfer System Inventory (LTSI), a psychologically sound instrument designed to measure the key system factors influencing the transfer of training in organizations. The LTSI has been validated not only in the U.S. but also in several other countries. Some studies in Korea have used the LTSI as a tool to measure the factors affecting the transfer of training in a variety of organizations. However, such studies have tended to use it without using rigorous translation procedures such as forward and backward translations, subjective and objective evaluations, and a pilot test. In addition, the LTSI has never been validated in Korea. Accordingly, this study proposes a Korean version of the LTSI that is culturally more appropriate for future research on transfer issues: the proposed Korean version was developed by translating the LTSI into Korean by using a rigorous translation procedure and validating it in a variety of organizations in Korea. In addition, this study examined the differences in the characteristics of the learning transfer system between private and public organizations by using the proposed Korean version of the LTSI. The results show there are significant differences in 13 factors with an exception of one factor, personal outcomes - negative factor between two types of organizations.

한 분야에서 수십년 취재하는 전문가 돼야

최희준 관훈클럽 2009 관훈저널 Vol.- No.111

Effect of Poloxamer-Based Thermo-Sensitive Sol-Gel Agent on Upper Limb Dysfunction after Axillary Lymph Node Dissection: A Double-Blind Randomized Clinical Trial

최희준,유재민,채병주,김은규,민준원,신혁재,남석진,유종한,이정언,이세경,김석원 한국유방암학회 2021 Journal of breast cancer Vol.24 No.4

Purpose: Restricted shoulder motion is a major morbidity associated with a lower quality of life and disability after axillary lymph node dissection (ALND) in patients with breast cancer. This study sought to evaluate the antiadhesive effect of a poloxamer-based thermosensitive sol-gel (PTAS) agent after ALND. Methods: We designed a double-blind, multicenter randomized controlled study to evaluate the clinical efficacy and safety of PTAS in reducing upper-limb dysfunction after ALND. The primary outcome was the change in the range of motion (ROM) of the shoulder before surgery and 4 weeks after ALND (early postoperative period). Secondary outcomes were shoulder ROM at six months, axillary web syndrome, and lymphedema (late postoperative period). Results: A total of 170 patients with planned ALND were randomly assigned to one of 2 groups (poloxamer and control) and 15 patients were excluded. In the poloxamer group (n = 76), PTAS was applied to the surface of the operative field after ALND. ALND was performed without the use of poloxamer in the control group (n = 79). Relative to the control group, the poloxamer group had significantly lower early postoperative restrictions in total shoulder ROM at four weeks (−30.04 ± 27.76 vs. −42.59 ± 36.79; p = 0.0236). In particular, the poloxamer group showed greater reductions in horizontal abduction at four weeks (−3.92 ± 9.80 vs. −10.25 ± 15.42; p = 0.0050). The ROM of the shoulder at 24 weeks, axillary web syndrome, and lymphedema were not significantly different between the two groups. No adverse effects were observed in either group. Conclusion: We suggest that poloxamer might improve the early postoperative shoulder ROM in patients with breast cancer who have undergone ALND.