• Journal of the Korea Society for Simulation
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• v.17 no.4
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• pp.61-69
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• 2008

In order to evaluate the performance of priority queues for future event list in discrete-event simulations, models representing patterns of enqueue and dequeue processes are required. The time complexities of diverse priority queue implementations can be compared using the performance models. This study aims at developing such performance models especially under the environment that a developed simulation model is used repeatedly for a long period. The developed performance model is based on multi-stage Markov process models; probabilistic patterns of enqueue and dequeue are considered by incorporating non-homogeneous transition probability. All necessary parameters in this performance model would be estimated by analyzing a results obtained by executing the simulation model. A case study with a war game simulation model shows how the parameters defined in muti-stage Markov process models are estimated.

• Journal of Korean Society of Forest Science
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• v.84 no.4
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• pp.437-446
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• 1995

This study was carried out to estimate the Korean Pine stand structure such as coefficient of variation of mean DBH, number of trees and volume per ha by Weibull distribution for each age class from I to V, based on photo measurement and timber cursing in Kangwon National University Experimental Forests. The results were summarized as follows: 1) Coefficient of variation of mean DBH for each age class from I to V, which was obtained by converting DBH estimated from crown diameter by photo measurement into quadratic mean DBH, was estimated as 28.88%, 24.13%, 23.29%, 20.27%, and 18.79%, respectively. 2) Number of trees per ha of each age class by Weibull distribution was obtained as 2875, 2100, 1875, 800, and 325, respectively. 3) Volume per ha of each age class was estimated as $22.9m^3$, $66.8m^3$, $101.3m^3$, $209.6m^3$, and $266.8m^3$, respectively. 4) Therefore, aerial photographs will be helpful to estimate the stand structure effectively.

• Proceedings of the KSPS conference
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• 1997.07a
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• pp.258-259
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• 1997

1. 외국어로서의 영어 교육에 있어서 발음 지도는 어느 정도의 영어 수준에 도달하기를 기다릴 필요없이 가능한 한 저학년에서부터 직접 지도되어야 한다. 즉 영어 교육은 영어 발음 교육부터 시작되는 것이 가장 바람직하다. 어느 정도의 수준 높은 문법 이론을 알고 있는 (대)학생들이라도 발음에 관한 한 많은 연습이 요구되는 경우가 흔히 있다. 바꿔 말하면 이러한 학생들은 그들이 갖고 있는 문법 지식만큼 발음에 대한 적극적인 구사력도 당연히 발휘할 수 있어야할 것이다. 영어 교육을 강조할 때 문장 구조와 어휘 교육이 중요시된다면 발음 또한 조기 교육 단계부터 영어 교육 프로그램의 필수불가결한 요소로 인식되어야 한다. 그렇다면 제일 처음 무엇을 어떻게 시작 해야할 것인가\ulcorner 흔히 음소(phoneme)라는 말의 최소 단위부터 시작하여 자음군(consonant cluster)과 같은 음 결합체를 가르친 다음 단어 강세(word stress)를 다루며, 마지막으로 문장 강세(sentence stress), 리듬(rhythm), 억양(intonation) 등을 포함함 이음말(connected speech)을 가르치는 순서가 될 수 있을 것이다. 그러나 이러한 방법이 이론상 논리적이긴 하지만 실제로 영어를 외국어로 배우는 우리 학생들에게는 얼마나 효과를 거둘 수 있는지 매우 의심스렵다. 오히려 가장 유익한 순서는 기본 억양 과 같은 적절한 표현과 함께 주어진 화맥 속에서의 의미 있는 문장 강세를 가르치고 그 다음에 그에 수반되는 중요한 소리의 발음을 지적해 주는 것이다. 예를 들면 Give it to him과 같은 구조를 교사가 구두로 제시할 때 단어 하나 하나를 강조한 나머지 너무 천천히 말하게 되면 전체 문장의 발음을 오히려 어렵게 만들어버린다. 중요한 것 은 기본 의사소통에 필요한 부분에 초점을 맞추는 일이다. 개별 단어에 부수되는 문제점은 '보충 지도'(remedial teaching)로 교정이 가능하다. 2. 우리의 초등학교 영어 교육의 현황을 고려할 때 비록 발음 지도가 쉬운 일은 아니지만 미래 지향적 결과를 기대할 때 우선 두 가지를 생각할 수 있다. 첫째로 현재의 교육대학교의 교사양성에 있어서 영어교육의 교과과정을 염두에 두지 않을 수 없다. 1981년도부터 교육대학교가 4년제가 명실공히 영어과로 운영되기는 수년밖에 되지 않는 실정이다. 현재의 교과과정도 현장에서 영어교육을 담당하기에는 불충분할 뿐만 아니라 영어발음에 관한 뚜렷한 과정이 없는 실정이다. 혼히 외국인 강사가 담당하는 이른바 영어회화 시간이 곧 발음 시간도 될 수 있다고 생각하기 쉬우나 이것은 전적으로 별개의 문제이다. 따라서 체계적인 발음 교육을 할 수 있는 교과과정이 되기를 바란다. 3. 앞에서 언급했듯이 4년제 이전에 졸업한 현직 교사들은 재학 중 영어 발음에 관한 지도를 받아본 적이 없다. 여기서 중요한 것은 이들 교사들에게 적절하고도 충분한 발음 교육을 시켜야 하는 연수 과정이다. 소리로 듣고 말해야 하는 초둥 영어 교육에 서 교사의 발음에 관한 지식은 그 중요성을 아무리 과대평가해도 지나치지 않을 것이다. 문제는 연수 내용이다. 적어도 현재까지 실시되어 온 초둥영어교육 담당자 연수 교과목 내용은 핵심을 찾기 힘들 정도로 교파목이 다양하고 산만하다. 따라서 예를 들면 영어발음 지도에 관한 과목도 마지못해 끼워 넣는 식의 과목 배정이다. 여기에 고작 할당된 시간은 많아야 4시간 정도이다. 대학에서 한 학기에도 부족한 영어 발음을 아 무런 배경 지식도 없는 초등 교사들에게 4시간 동안 무엇을 어떻게 가르칠 것인가\ulcorner

• Korean Journal of Environment and Ecology
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• v.19 no.1
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• pp.19-30
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• 2005

The objective of this study was to monitor the edge vegetation development process after timber harvesting at deciduous hardwood forest in Seoul National University Forests of Baekwoonsan(Mt), Korea. From 1994 to 1999, Woody plants were monitored on two experimental plots established in 1994. The edge vegetation development pattern during the last six years(1994-1999) after timber harvesting is summarized as follows; Weigela subsessilis, Lindera erythrocarpa, Stephanandra incisa, Zanthoxylum schinifolium appeared to be a competitive species at the harvested forest edge. Staphylea bumalda, Lindera erythrocarpa, Viburnum erosum appeared to be a competitive species at harvested forest border between the harvested forest edge and the harvested interior. Weigela subsessilis, finders erythrocarpa, Lindera obtusiloba appeared to be a competitive species at the forest interior. The mean relative important value of major species were changed along the distance from the forest edge to the forest interior and seemed to be affected by aspect, and existing woody plants. But similarity indices seemed to be affected by distance. Species composition of forest edge(0-10m) was dissimilar to that of the other forest edge(40-50m). Species diversity indices, number of species and individuals were decreased according to the distance from the forest edge to the forest interior with passing time.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.6
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• pp.235-249
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• 2020

The Ministry of Land, Infrastructure and Transport established safety standards for Level 3 autonomous vehicles for the first time in the world in December 2019, and specified the safety standards for conditional autonomous driving systems. Accordingly, it is necessary to analyze the influence of various driving environments on take-over. In this study, using a driving simulator, we investigated how traffic conditions and weather conditions affect take-over time and stabilization time. The experimental procedure was conducted in the order of preliminary training, practice driving, and test driving, and the test driving was conducted by dividing into a traffic density and geometry experiment and a weather environment experiment. As a result of the experiment, it was analyzed that the traffic volume and weather environment did not affect the take-over time and take-over stabilization time, and only the curve radius affects take-over stabilization time.

• Asia Marketing Journal
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• v.11 no.3
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• pp.185-203
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• 2009

Yuhan Kimberly, a joint-venture company of Korean Yuhan Company and American Kimberly-Clark, opened a premium diaper market in Korea by launching Pull-Ups which was pants-typed diapers in 1993. Pull-Ups was imported as finished goods from Kimberly-Clark. However, in spite of its huge market share in United States, it failed to land down in Korean market because of wrong positioning strategy which did not consider domestic customers' tastes. In 1996, Yuhan-Kimberly brought out a pants-typed diaper, Huggies-Toddler, to Korean market again. This paved the way for the combination of Kimberly-Clark's production power and Yuhan-Kimberly's marketing power and led to launch new product superior to Pull-Ups. However, this product was unsuccessful in the market because of wrong positioning which did not catch domestic customer's life styles such as cultural, environmental and habitual differences in toilet training, the cost increase coming from IMF crisis in Korea, weak trust within the company, weak trust within the company, and too much higher price than regular diapers. In 2005, Yuhan-Kimberly redeveloped new pants market business strategy. It was organically combined with winning product development plan, winning communication strategy and the market structure change through the pants market creation. Customer's habit, usage and attitude were studied with total 55 times market investigations. Also, all processes from planning to designing were executed in the customer's view by investigating product research, positioning research and advertisement research. Yuhan-Kimberly repositioned new product as a wearing diaper not as a toilet training diaper and launched Huggies Magic Panty as a premium product which had 25% higher price than previous Huggies. Huggies Magic Panty was recognized as a great hit product in domestic diaper market and the sales recorded 37.6 bill won in 2006, 57.2 bill won in 2007, and 90 bill won in 2008 since launching in 2005. The reason of Huggies Magic Panty's success was the repositioning strategy deduced from the precise check of customer's usage habit. It was the winning strategy of Huggies that were market investigation in order to survive in domestic baby goods market where a lot of companies struggled intensively, the exact positioning based on its market investigation and aggressive 360 degree communication strategy to give customers impressions efficiently.

• Korean Journal of Psychosomatic Medicine
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• v.12 no.2
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• pp.95-102
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• 2004

Backgrounds: It was thought that sport was related with mentality. Compared to psychology, psychiatry has so far paid rather little attention to athletes. In this overview, I attempted to introduce the ideas of various observers of sports with the view of clinical psychiatry and summarized basic principle role of psychiatrist. Results and Discussions : To understand the athletic frame of mind, it is helpful to observe athletes in their psychologic development and when we do so we can quickly see trends that are not apparent by observing mature athletes alone. Psychobiology of sport would discuss some of the endogenous neurochemicals(hormone, neurotransmitter) that may be part and parcel of the athlete's psychiatric status. The psychological problems that frequently interfere with training and competition may be divided into five categories 1) choke, 2) slump, 3) injury, 4) interpersonal problem, 5) training dilemma. Psychiatric problem also arise in athletes like general people. various method for psychiatric patients like psychotherapy, group therapy, family systems perspective, and pharmacotherapy could been applied to sports psychiatry. Conclusions Although the contribution of sports psychiatry to sport is clinical one, psychiatrist's interest in role and conflict of athlete would enhance the molding of humanistic athletes who enjoy their life and sports.

• Journal of the Society of Disaster Information
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• v.18 no.1
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• pp.173-181
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• 2022

Purpose: The purpose of this study was to examine the safety awareness and safety behaviors of personal assistant for visual impairments. Method: This study was targeted at 263 personal assistant for blind people from May to June 2021. Research subjects who wished to participate in the study expressed their intention to participate through the recruitment documents and gave written consent before participating in the study. Result: First, the safety awareness and safety behavior were high among the personal assistants who had practical fire extinguisher practice experience and education on how to act in a disaster situation. In addition, when the emergency rescue method was educated, the life safety awareness and fire safety awareness were high, but there was no difference in the awareness of disaster safety, and the safety behavior was higher. Third, the higher the life safety awareness, fire safety awareness, and disaster safety awareness of personal assistant for the visually impaired, the higher the safety behavior. Conclusion: This study revealed that it is important to provide appropriate safety education to personal assistant and implement a program to raise safety awareness so that the visually impaired can live a safer life.

• Journal of The Korean Association For Science Education
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• v.43 no.6
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• pp.533-547
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• 2023

This study is an action research aimed at improving the instruction of a teacher educator who teaches science teaching methods to elementary preservice teachers. After identifying the cause of their low levels of curiosity and interest in physics, teaching plans addressing this problem were explored, applied to classes, and reflected upon. Through this process, ways to improve teaching practice in science classes for elementary preservice teachers and pique their scientific curiosity and interest were proposed. A spiral implementation structure that repeats implementation and reflection a total of three times was designed for the prospective preservice teachers who participated in elementary science textbook research physics classes. Self-reports, student participation data, and results from both peer and self-evaluations were collected and analyzed. The reasons for the preservice teachers' low levels of curiosity and interest in science were identified as their inability to recognize and express information gaps and their low levels of willingness to resolve this. Practice expressing information gaps, raising the level of knowledge to be able to recognize information gaps, and a strategy to have the will to resolve information gaps were introduced into the class. To the extent that changes can be made by improving unit classes, elementary preservice teachers can express their curiosity and interest in science through this process.

• Journal of Korean Society of Forest Science
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• v.82 no.3
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• pp.235-245
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• 1993

This study was carried out to understand the stand structure based on the compositional characteristics of natural deciduous forest dominated by Quercus species, which will provide with fundamental ecological and silvicultural information for effective forest management. Of two tracts selected from the Seoul National University Research Forests, one is located in Kwangju-Gun Kyunggi-Do, and the other in Kwangyang-Gun Chollanam-Do. Point-quarter sampling method w-as employed to survey woody vegetation confined to larger than 6cm in DBH. The numbers of sample points were 152 and 187, in Kwangju-Gun and Kwangyang-Gun, respectively. Comparative analysis for two forest tracts was made as follows ; 1) species composition by calculation of importance values ; 2) number of stems per hectare for major tree species ; 3) species diversity for the forests in two locations ; 4) inter-species association based on $X^2$ test. The relative dominate of Quercus speices showed 88% at Kwangju-Gun, Kyunggi-Do and 50% at Kwangy-ang-Gun. Chollanam-Do. Such high dominance occurred due to high importance values of Quercus variahilis and Q. mortgolica in both locations. Quercus serrata showed low value at Kwangju-Gun. Kyunggi-Do whereas Q. acutissirna, Q. dentata and Q. aliena did none at Kwangyang-Gun. Chollanam-Do. The species diversity and evenness in oak communities exhibited 0.82 and 0.61, respectively at Kwangju-Gun. Kyunggi-Do, while those did 1.09 and 0.73 at Kwangyang-Gun, Chollanam-Do. Therefore, it was considered that Ku-angju-Gun region was disturbed severely by human activities but Kwangyang-Gun region eras less disturbed. Frequent appearance of Carpinus and Acer species indicates increase in diversities and better development of succession at Kwangyang-Gun region.