영구동토 급속안정화를 위한 롤타입강재매트의 모델링과 해석(I)

문도영(Do Young Moon),강재모(Jae Mo Kang),이장근(Janggeun Lee),이상윤(Sang Yoon Lee),지광습(Goangseuo Zi) 한국지반신소재학회 2014 한국지반신소재학회 논문집 Vol.13 No.4

본 논문에서는 표준트럭하중을 받는 연약지반에 놓인 롤타입 강재매트의 모델링과 해석을 수행하였다. 롤 타입 강재매트는 접근성이 제한된 동토지역에서 손쉬운 현장운반을 위해 원형으로 접을 수 있는 강재매트를 의미하며, 동토지반의 융해로 형성되는 연약지반을 통과하는 비포장도로의 급속보강을 위해 개발되었다. 해석 모델은 강재매트 연결부의 비선형적 거동특성을 모사할 수 있는 연결요소, 강재매트의 휨강성을 갖는 쉘요소, 지반특성을 고려한 스프링 구속으로 구성된다. 또한 각 해석요소들의 구조적 거동은 각 모델링 단계에서 실험과 해석을 통해 검증되었다. 링크요소가 없는 빔과 쉘 요소해석이 수행되었으며, 본 연구에서 제시된 해석모델의 결과와 비교하였다. 해석결과, 본 연결부를 고려한 쉘 해석모델의 수직 처짐 결과가 다른 모델에 비하여 상당히 큰 것으로 확인되었다. 따라서, 느슨한 모래지반에 놓인 롤 타입 강재매트의 해석모델은 면밀한 변수해석 연구에 근거하여야 함을 알 수 있다. Finite element modelling and analysis were conducted for the roll-type steel mats which were placed on loose sand and subjected to a standard truck wheel load in this study. The roll-type steel mats mean that the steel mats can be folded as a circle shape for the carrying to fields in cold regions where workability is limited and are developed for a rapid rehabilitation method for roadway across soft ground which is caused by thawing during the summer season in cold regions. The model is composed of link elements to simulate nonlinear behavior of connections between steel mats, thick shell elements to have flexural stiffness of the steel mats, and springs to simulate characteristics of foundation soils. The structural behaviors of the shell, link elements, and springs were verified at each modelling step through experiment and analysis. Beam and shell analysis without the link elements were conducted and compared to results obtained from the model presented in this study. Significant vertical displacement is shown in the shell model with hinge connections. Therefore, the results demonstrate that the analysis model for the roll-type steel mats on loose sand needs further detail parametric studies.

『韓國水産誌』편찬단계(1908년)의 전통어업과 일본인 어업

강재순(Kang Jae-Soon) 동북아시아문화학회 2011 동북아 문화연구 Vol.1 No.27

This paper analyzed firstly the aspects and characteristics of the traditional Korean fishery and Japaneses’ fishery as described in The Chronicle of Korean Fisheries published by the Korean Empire in 1908. The ‘capitalistic development of fishery’ of the traditional Korean fishery in the late Korean Empire, which had been going internally since the latter part of the Chosun Dynasty, was threatened by both Japanese fishermen’s entry into the Korean peninsula coastal waters and the creation of markets for Japaneses, but on the other hand various possibilities were also coexisting with them, like the one of the provision of a new chance. Meanwhile the Japaneses’ fishery at that time was also trying to pioneer and expand a market for Koreans. That was a violation of the traditional fishery area of Koreans, inevitably leading to a dispute with Korean fishermen. This dispute between the traditional fishery and Japaneses’ fishery came to take a different appearance, that of a direct attack by loyal troops after 1907. The publication of The Chronicle of Korean Fisheries in 1908 is related to the ‘Fishery Law’ proclaimed in the following year, 1909. The appearance of the change of the traditional fishery and Japaneses’ fishery in the Korean peninsula coastal waters called for the abolition of the existing system of Korea-Japan fisheries agreement and the establishment of a new system which ensures the fishery rights of Japanese fishermen. The publication of The Chronicle of Korean Fisheries in 1908 can be said to be significant, therefore, in making a preliminary investigation and accumulating the data on the fishing practices in those days for the proclamation of the ‘Fishery Law’ of 1909.

수분변화량에 따른 목재의 균열 현상 가시화 방안

강재신(Jaesin Kang),김재원(Jaewon Kim),안은영(Eunyoung Ahn) 한국멀티미디어학회 2016 멀티미디어학회논문지 Vol.19 No.10

蒙古의 제1차 침공과 被陷 北界 14大城의 抗戰

姜在光(Kang Jae-Gwang) 한국사연구회 2009 한국사연구 Vol.146 No.-

Mongol army that was controlled by Sartai(撒禮塔), the general of the army, suddenly invaded Koryo in 18th year(1231) August of Gojong(高宗)'s rule in the name of Jugoyeo(著古與) murder. But, the real reason of Mongol invasion was to satisfy Mongol's economical avarice, imposing very much tribute to Koryo Court. In different from writing of Wonsa(元史), Sartai didn't take possession of 40 castles in Bukgye(北界) of Koryo dynasty. He could only occupy 14 big castles that had existed as strategic position of Bukgye. Out of them, Hamsinjin(咸新鎭) and Inju(麟州) surrendered itself to Mongol invader. And 7 Ju(州) including Sunju (宣州) and Kwakju(郭州) were captured by Mongol army, because the headquarter of 7 Ju had escaped to islands which were determined by Choi’s political power(崔氏政權). Therefore, Sartai actually attacked and defeated 5 Ju including Yongju(龍州) and Cheolju(鐵州), with his own strength. Koryo Samgun(三軍) failed to win Mongol army in Anbukbu(安 北府) battle, on November 1232. As the result, Koryo Court could not help concluding peace negotiations with Mongol on a low profile. On conclusing peace negotiations, Bukgye province was submitted to Mongol influence, centering around Seokyung(西京). From December 1231 to February 1232, Bukgye province came to the rule of Darugachi(達魯花赤) and Tammajeokgun(探馬赤軍) step by step. But the governor of Koryo, Choi Woo(崔瑀) started to eliminate Tammajeokgun located in the south region of Seokyung, after Mongol army withdrew on January 1232. Further more, Choi Woo carried out escape to Kangwha island(江華遷都) with lightning speed on June 1232. He spreaded out the movement for recovery of lost territory and for destroying Darugachi all over the Bukgye, from July to August the same year. In this movement linked with Island Protection Tactics(海島入保策), the headquarter and military force of 7 Ju including Sunju that moved into appointed islands, played the trigger role in defeating Darugachi. So Choi’s political power managed to recover some territory of Bukgye before second Mongol invasion.

1998 / 1999 남극 킹조지섬 마리안소만 표층수에 서식하는 미세조류의 계절적 변동

강재신(Jae Shin Kang),강성호(Sung Ho Kang),이진환(Jin Hwan Lee),최돈원(Don Won Choi),이상훈(Sang Hoon Lee) 한국환경생물학회 2000 환경생물 : 환경생물학회지 Vol.18 No.1

We investigated seasonal variation of microalgal assemblages, sea water temperature, salinity and suspended solid and the parameters measured daily from January 1998 to October 1999 at a nearshore shallow-water in Marian Cove, Maxwell Bay, King George Island, the Antarctic. Annual mean surface water temperature was -0.30℃ and the highest water temperature was 4.53℃(22 January 1999) and the lowest water temperature was -2.07℃(23 August 1998). Annual mean salinity was 33.38 psu, ranging from 42.80 psu(6 January 1999) to 19.50 psu(6 June 1999). Annual mean suspended solid(SS) during two years was 34.14 ㎎·1^-1, ranging from 60.62 ㎎·1^-1(7 March 1998) to 12.90 ㎎·1^-1(26 December 1998). Chlorophyll α(Chl α) concentrations were measured in order to know seasonal variations of microalgae in the surface seawater. Annual mean of total Chl a concentration was 0.55 ㎍·1^-1, the highest Chl α concentration(12.16 ㎍·1^-1) appeared in 4 October 1998, the lowest Chl α concentration appeared 0.19 ㎍·1^-1. Monthly mean total Chl a concentration was high in October 1998(1.32 ㎍·1^-1) and low in July on 1998(0.28 ㎍·1^-1). Annual mean nano-sized Chl α concentration was 0.40 ㎍·1^-1, monthly mean nano-sized Chl α concentration was high in November 1998(0.90 ㎍·1^-1), and low in July 1999(0.22 ㎍·1^-1). Annual mean micro-sized Chl α concentration was 0.15 ㎍·1^-1, monthly mean micro-sized Chl α concentration was high in October 1998(0.81 ㎍·1^-1), and low July 1998, January, February and September 1999(0.05 ㎍·1^-1). More than 65% of total Chl α was concentrated during spring and summer time between October and March. Microalgal variation appeared to be due to physical factors of seawater in the Antarctic nearshore from 1998 to 1999. The reason why micro-sized Chl α did not increase during austral summer was the bay had been frozen by decrease of water temperature. We think that total microalgal abundance was decreased because the summer microalgal abundance was determined by variation of water temperature during winter season. [Chl α concentration, Microalgal assembalges, Seasonal variation, the Antarctic nearshore].

콜센터 상담원의 사회적 스트레스와 직무요구가 정서적 소진에 미치는 영향과 고용특성에 따른 조절효과

강재정(Jae-Jung Kang),안순화(Soon-Hwa Ahn),정영태(Yung-Tae Jung) 한국인터넷전자상거래학회 2012 인터넷전자상거래연구 Vol.12 No.3

The rapid development of the Internet and communication technology has changed the way of interact with customers. Internet-based call centers have become one of the most popular approaches to improve the customer service and upgrade the company"s image. On the other hand, the employees who work in call centers have experienced many difficulties and emotional burnout in the process of dealing with their customers respectively. This study intends to investigate the effects of job demand and customer related social stress on emotional burnout among those who work in call center and the moderating factors in these relationships. Based on the previous studies, we constructed a research model and hypotheses. For the empirical study, we collected 116 data set from the workers of the firms that supplied call center services. The results of the multiple regression show that customer-related social stress and job demand have significant impacts on the employees" emotional burnout. Also there are some moderating effects in the relation between customer-related social stress, job demand and emotional burnout according to the type of employment, performing job, and union affiliation. Broadly the impact of customer related social stress and job demand on emotional burnout increased in situation with marriage, part-time job, inbound call task, and non-union affiliation. From these results, we concluded that call center managers have to understand the moderating effects and prepare the effective management practices to reduce emotional burnout.

대형할인점과 편의점의 입지에 영향을 미치는 사회경제적 요인에 관한 연구

강재정(Kang Jae Jung),안순화(An Soon Hwa) 濟州大學校 觀光産業硏究所 2015 産經論集 Vol.34 No.-

일반논문 : 사회적 질(質)에 대한 만족도가 제주도민의 행복에 미치는 영향

강재정 ( Jae Jung Kang ),조부연 ( Boo Yun Cho ) 제주대학교 탐라문화연구소 2014 탐라문화 Vol.0 No.44

불안정 애착이 외상 후 성장에 미치는 영향: 의도적 반추와 사회적 지지의 매개효과 -제주지역을 중심으로 The Effect of Insecure Attachment on Posttraumatic Growth: Mediating Effect of Intentional Rumination and Social Support In Jeju 175 외상, 애착, 외상 후 성장, 의도적 반추, 사회적 지지, trauma, attachment, posttraumatic growth, intentional rumination, social support This study tried to identify the casual relationships among economical satisfaction, social quality, and happiness recognition of residents of Jeju province. We surveyed 987 respondents based on stratified sampling, and applied t- test and ANOVA test to understand the characteristics of Jeju province. Also, the results from regression analysis suggest meaningful antecedents to elaborate happiness recognition. We learn the difference for happiness recognition by gender, age, occupation, income, and perceived social class. And the social quality has been emerged as the antecedent to influence happiness recognition with its sub-dimensions of cultures and education, welfare, convenient facilities, public service, and relationship towards local community. Also, economical satisfaction improves happiness recognition with no disturbing influence to the relationship between social quality and happiness recognition. Considering the different effects of sub-dimensions of social quality, we suggest more detailed approach when local government and community to enhance social quality. And we recommend more efforts to invigorate the local economy with the lesson of coexistence of economical satisfaction and social quality in improvement of happiness recognition for residents of Jeju province.

후두실과 진성대에 발생한 점액종 1예

강재호(Jae Ho Kang),김춘동(Choon Dong Kim),염동진(Dong Jin Yum),김승우(Seung Woo Kim) 대한두경부종양학회 2007 대한두경부 종양학회지 Vol.23 No.1

Myxoma is an uncertain mesenchymal cell origin, characterized by irregular round, stellate or spindle cells sur-rounded by the matrix containing abundant mucoid material and scant vascularity. Their occurrence in descen-ding order of frequency is in the heart, subcutaneous tissue, bone and genitourinary tract. In the head and neck region, the most predilection sites are mandible and maxilla(more than 80%). Laryngeal myxoma is extremely rare:only 5 cases have been reported in the English literature. We report a rare case of laryngeal myxoma. A 60-year-old man with hoarseness visited the out-patient department. The mass was located between the vocal fold and the vocal ligament, filling with the left laryngeal ventricle. We planned the laryngo-microsurgery and suc-cessfully excised using CO 2 laser. The histopathologic finding revealed the myxoma. After 18 months of surgery, there is no evidence of recurrence and mucosal scarring in the vocal fold. This report is the first case of laryn-geal myxoma involving the laryngeal ventricle and the true vocal cord together.

지속적 정보제공 의도의 주요 결정요인

강재정(Jae-Jung Kang),김유정(Yoo-Jung Kim) 한국컴퓨터정보학회 2016 韓國컴퓨터情報學會論文誌 Vol.21 No.2

This study investigates how anticipated value(attainment value, intrinsic value, utility value, and reward value) and self-efficacy in providing information have an influence on continuance intention to provide information in the context of online community or social media. We propose a conceptual model for examining the framework for the effect of anticipated value on attitude toward providing information, and the effect of attitude toward providing information and self-efficacy in providing information on continuance intention to provide information. Proposed research model is empirically assessed using the survey data obtained from 221 respondents in Korea. Results show that attainment value and intrinsic value have a significant impact on attitude toward providing information, whereas utility value and reward value are found to be insignificant. In addition, attitude toward providing information and self-efficacy in providing information are positively and significantly related to continuance intention to provide information.