• 한국의학물리학회지:의학물리
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• 제18권2호
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• pp.98-106
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• 2007

2005년 6월 연세의료원 세브란스병원에서는 진단목적으로 20대의 5 mesa 화소 Totoku ME511L 평판 LCD 표시장치를 추가하여 PACS를 확장하였다. 20대의 Totoku ME511L 표시장치를 대상으로 반사, 휘도 반응, 휘도 공간 의존, 분해능, 잡음, 베일링 그레어, 그리고 색도 항목에 대하여 AAPM TG 18보고서에 기준하여 정량적인(또는 시각적인) 인수검사를 실시하였다. 측정에 사용된 장치는 색도를 측정할 수 있는 만원경식 휘도계, 조도계, 반사 측정에 필요한 빛 선원, 빛 차단 장치, 그리고 TG18 테스트 패턴들이었다. 선택된 8대의 표시장치에 대한 평균 확산 반사계수($R_d$)는 $0.019{\pm}0.02sr^{-1}$이었다. 휘도 반응 검사에서, 휘도비(LR), 최대 휘도 변이($L_{max}$), 그리고 최대 대조도 반응 변이는 각각 $550{\pm}100,\;2.0{\pm}1.9%$, 그리고 $5.8{\pm}1.8%$이었다. 휘도 균일도 검사에서, 최대 휘도 변이는 TG18-UNL10 테스트 패턴의 10% 휘도에 대하여 $14.3{\pm}5.5%$이었다. 분해능 측정은 휘도 측정법으로 수행하였으며 중심에서 퍼센트 휘도(${\Dalta}L$)는 $0.94{\pm}0.64%$이었다. 시각적인 방법의 잡음측정의 모든 경우에서, 중앙 및 주위 4사분면에서 가장 작은 것을 제외하고 15개의 모든 정사각형의 표적을 인식할 수 있었다. 글레어 비(GR)은 $12,346{\pm}1,995$이었다. 최대 색도 균일도 지표(D)는 $0.0025{\pm}0.0008$이었다. 또한 국내 실정에 적합한 진단용 표시장치의 정도관리 가이드라인 연구 결과를 제시하였다. 모든 인수검사 결과는 AAPM TG18 보고서 기준에 포함되어 진단 목적으로 사용하기에 적합하였다. 결론으로 인수검사는 표시장치가 진단에 사용하기에 적합한 성능임을 알려줄 뿐만 아니라 정도관리의 가이드라인, 최적 판독 환경, 그리고 표시장치의 교체시기를 결정하여주는 중요한 역할을 할 수 있다.

• 한국인구학
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• 제15권2호
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• pp.15-59
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• 1992

After world war II Japanese life expectancy has been improved remarkably, and reached the highest level in the world around late 1970's. The life expectancy of Korean has also shown tremendous improvement in recent years with about 20 year's gap from the Japanese. The reason of rapid improvement of life expectancy can be explained by changes in the structure of cause of death due to health system, living standard, social welfare, health behavior of individuals and so on. Korean in Japan is placed under different situations from both Korean in Korea and Japanese in these regards, and expected to show different picture of cause of death pattern. The objective of this study is the comparision of changing patterns of cause of death of three population groups, Korean in Japan, Korean in Korea and Japanese, and to investigate the reasons which effect to the structural difference of mortality cause with special emphasis on health ecological aspects. One of the major limitations of the Korean causes of death statistics is the under-registration which ranges about 10% of the total events, and inaccuracy of the exact cause of death. Some 20% of registered deaths were unable to classify by ICD. However, it is concluded that the Korean data are evaluated as sufficient to stand for over-viewing of trends of cause of death pattern. The evaluation is done by comparing data from registration and field survey over the same population sample. Population data of Korean in Japan differ between two sources of data; census and foreigner's registration. Correction is done by life table method under the assumption that age-specific mortality pattern would accord with that of the Japanese. The crude death rate was lowest among Korean in Japan, 5.7 deaths per 1,000 population in 1965. The crude death rates of Korean in Japan and Japanese are increasing recently influenced by age structure while Korean in Korea still shows decreasing tendency. The adjusted death rate is lowest among Japanese, followed by Korean in Japan, and Korean in Korea. The leading causes of death of Korean in Korea until 1960's was infectious diseases including pneumonia and tuberculosis. The causes of death structure changed gradually to accidents, neoplasm, hypertensive disease, cerebro-vascular disease in order. The main difference in cause of death between Korean and Japanese if high rate of liver diseases and diabetes for both Korean in Japan and Korea. A special feature of cause of death among Korean in Korea is remakably high rate of hypertensive disease, which is assumed to be caused by physicians tendency in choosing diagnostic categories. The low ischemic heart disease and high vasculo-cerebral disease are the distinctive characteristic of the three population groups compared to western countries. Specific causes of death were selected for detailed sex, age and ethnic group comparisons based on their high death rates. Cancer is the cause of death which showed most dramatical increase in all three population groups. In Korea 20.1% of all death were caused by cancer in 1990 compared with 10.5% in 1981. Cancer of the liver is the leading cause of cancer death among Korean in Japan for both sexes, followed by cancer of the lung and cancer of the stomach, while that of Korean in Korea is cancer of the stomach, followed by cancer of the liver and cancer of the lung for male. Causes of infant mortality were examined among the three population groups since 1980 on yearly bases. For both Japanese and Korean in Japan, leading cause of death ranks as conditions originating in the perinatal period, congenital anomalies, accidents and other violent causes. Trends since 1980 for these two population groups in the leading cause of infant mortality showed no changes. On the contrary, significant changes in leading cause of death structure in Korea were observed : the ranking of leading cause of death in 1981 were congenital asnomalies, pneumonia bronchitis, infectious disease, heart disease, conditions originating in the perinatal period, accident and other violent causes ; in 1990 the ranking shifted to congenital anomalies, accident, pneumonia bronchities, conditions originating in the perinatal period, infectious disease. The mortality rate by congenital anomalies in Korea continuously grew than any other causes. Larger increase ocurred during the 1990's

• 지능정보연구
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• 제18권1호
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• pp.39-57
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• 2012

최근 기존 전시 공간 내에 유비쿼터스 환경이 구축되면서, 관객과의 상호작용을 통해 전시 효과를 배가할 수 있는 인터랙티브 전시에 많은 사람들의 관심이 집중되고 있다. 이러한 인터랙티브 전시가 보다 고도화되기 위해서는 전시물에 대한 다양한 관객 반응을 측정하고, 이를 통해 대상 관객이 어떤 감정을 느끼는지 예측할 수 있는 적절한 의사결정지원 모형이 요구된다. 이러한 배경에서 본 연구는 인터랙티브 전시 공간 내에서 수집 가능한 다양한 관객 반응 중 얼굴표정의 변화를 이용하여, 관객의 감정을 추론, 판단하는 지능형 모형을 제시한다. 본 연구에서 제시하는 모형은 무자극 상태의 관객의 표정과 자극이 주어졌을 때 관객의 표정이 어떻게 변화하는지 변화량을 측정하여, 이를 기반으로 인공신경망 기법을 이용해 해당 관객의 감정을 판단하는 모형이다. 이 때, 제안모형의 감정 분류체계로는 간결하면서도 실무에 적용이 용이하여 그간 기존 문헌에서 널리 활용되어 온 매력-각성(Valence-Arousal) 모형을 사용한다. 제안모형의 유용성을 검증하기 위해, 본 연구에서는 2011 서울 DMC 컬쳐 오픈 행사에 참여하여, 일반인을 대상으로 얼굴 표정 변화 데이터를 수집하고, 이들이 느끼는 감정 상태를 설문조사하였다. 그리고 나서, 이 자료들을 대상으로 본 연구에서 제안하는 모형을 적용해 보고, 제안모형이 비교모형으로 설정된 통계기반 예측모형에 비해 더 우수한 성과를 보이는지 확인해 보았다. 실험 결과, 본 연구에서 제시하는 모형이 비교 모형인 중회귀분석 모형보다 더 우수한 결과를 제공함을 확인할 수 있었다. 본 연구를 통하여 구축된 관객 감정 판단 모형을 실제 전시장에서 활용한다면 전시물을 관람하는 관객의 반응에 따라 시의적절하면서도 효과적인 대응이 가능하기 때문에, 관객의 몰입과 만족을 보다 증대시킬 수 있을 것으로 기대된다.

• 한국지구과학회지
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• 제42권3호
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• pp.311-324
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• 2021

최근 화성시의 국가지질공원 인증 추진을 위해 10개의 지질명소가 개발되었으며, 이 중에서 제부도 지질명소는 다양한 지질·지형(경관)·생태유산이 분포하여 고정리, 우음도 지질명소와 함께 수도권 남부의 새로운 지구과학 교육 장소로 개발 잠재성이 크다. 이번 연구에서는 화성지질공원 제부도 지질명소의 야외조사를 통해 지질유산의 특징을 기재하고, 화성지질공원 내 다른 지질명소와의 비교·분석을 통해 지질교육 명소로서 개발 가능성을 평가하였다. 또한, 지질공원 및 지질명소에서의 현장교육이 현행 2015 개정 과학과 교육과정에서 강조하는 핵심개념과 교과역량 중심 교육에 실질적으로 미칠 수 있는 효과를 제부도 지질명소에 적용해 제시하였다. 제부도 지질명소에는 규암, 편암, 천매암 등 다양한 변성암류가 분포하며, 쇄설성암맥, 석영맥, 단층, 절리, 엽리, 편리 등의 지질구조들도 함께 관찰되어 지질다양성이 풍부하다. 또한, 해안가를 따라서는 역빈과 사빈, 해안사구, 갯벌 등 해안 퇴적지형과 연흔 등의 퇴적구조가 발달하고 있으며, 해식절벽, 해식동굴, 시스택 등의 해안침식지형과 함께 바다갈라짐 등 다양한 해안지형을 관찰할 수 있다. 제부도 지질명소는 기존에 현장교육에 활용되고 있는 화성지질공원의 고정리 공룡알화석산지 및 우음도 지질명소와 지질 및 지형학적으로 차별점을 가지므로 새로운 지질교육 현장으로서 충분한 가치를 지닌 것으로 판단된다. 아울러 제부도 지질명소에는 갯벌체험장과 같은 지질교육 및 지질관광 연계 콘텐츠가 풍부하고, 해안산책로, 전망대와 같은 탐방인프라 또한 잘 조성되어 있어 다채로운 교육프로그램 개발이 기대된다. 더 나아가 각 지질명소별 특성을 중심으로 최적화된 지질공원 교육을 수행함으로써 1) 학교에서 지질공원으로 학습 공간의 확장, 2) 구체적인 내용 요소의 이해도 향상과 핵심개념 사이의 연계, 3) 지구시스템 전반으로 교육 영역의 확대가 이루어질 수 있어 과학과 교육과정의 핵심역량인 사고력, 탐구력, 문제해결력을 향상시킬 수 있고, 지질공원 교육의 주체로 참여하는 경험을 통해 의사소통 능력 및 참여와 평생학습능력 강화에도 긍정적인 영향을 미칠 것으로 기대된다.

• 한국전통조경학회지
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• 제36권4호
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• pp.39-49
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• 2018

"조선왕조실록"을 중심으로 분석한 조선시대 제왕들의 위락활동과 변천에 관한 연구 결과는 다음과 같다. 궁중 안팎 외부공간에서 행해진 왕의 위락활동은 연회형, 강무형, 유희형으로 분류할 수 있는데, 연회형은 회례연, 진연(進宴), 풍정(豊呈), 진찬(進饌), 양로연, 사신연, 수연(壽宴), 곡연(曲宴) 등이었고, 강무형은 활쏘기, 격구, 사냥 등이며, 유희형은 나례(가면놀이), 처용무, 풍두희(?頭戱), 그리고 화산붕(불꽃놀이), 꽃놀이(賞花), 투호, 수박희(手搏戱), 낚시, 뱃놀이, 각투(角鬪), 상희(象戱), 잡희 등이었다. 위락 활동은 고려시대 답습기[1기, 태조~세조(예종)], 확립기[2기, 군사문화가 성리학 문화로 전환되었고 연회의 규례가 제도화, 성종~중종]. 단절기[3기, 임진왜란 등 불안한 정세 속에서 침체, 단절 초래, 성종~현종]. 중흥기[4기, 위락 문화 재정비, 수준 높은 왕실 문화의 자긍심 표출, 숙종~정조]. 그리고 쇠퇴기[5기, 세도정치로 왕권이 추락하면서 위락 활동이 급격히 퇴조, 순조~순종] 등 5단계시기로 구분할 수 있다. 왕들의 사냥 관련 기사는 600건 이상 추적 되는데, 태종, 세종, 세조 등은 각 100여회 이상이었다. 사냥 대상은 호랑이, 곰, 사슴과 노루, 표범, 멧돼지, 매 등 이었고, 한양의 동북쪽 산림지역에서 주로 행해졌는데, 산수풍광이 수려하고 지리에 익숙한 풍양, 철원지역 등 북방의 정세와 안전을 살피기 위한 방안, 그리고 풍양이궁(경기도 남양주시 진접읍 내각리) 장소성 등과 밀접하게 연계된다. 단오절 세시풍속으로 대중에 확산된 격구놀이는 조선 초 왕과 신하들의 최상류층 마상격구로부터, 중기이후 무과시험의 마상격구와 상류층의 보상격구로 전환되는 과정을 거쳐, 조선 후기에는 민간에 확산되어 겨울철 남성들의 집단유락문화로 전승되는 과정이 추적된다. 특히, 강무형 위락문화는 봄(활쏘기), 여름(투호), 가을(활쏘기), 겨울(격구) 등 심신수양을 겸한 4계절 행위요소로 작용되었다. 한편, 조선시대 왕과 왕비들의 연향과 같은 위락 활동은 공식적 의례의 경우 내정(內庭)에서, 비공식적 관유(觀遊)의 경우 궁궐 후원이나 별궁에서, 특수 연회의 경우 모화관과 태평관, 기로소 등 별원(別園)에서, 활쏘기의 경우 성균관 사단에서, 사냥의 경우 금표가 설치된 강무장(금원과 원유)에서, 매사냥의 경우 한강변 광나루에서, 격구의 경우 보격구 중심으로 내정이나 별궁에서 다양하게 행해졌다. 즉, 외조, 치조, 연조, 후원의 범위를 넘어서 별원과 금원, 원유 등 한양에서 최대 100리 범위 까지를 활동영역으로 설정하는 위락문화 확장성(정(庭)${\rightarrow}$원(園)${\rightarrow}$원(苑)${\rightarrow}$원유(苑?))을 추적할 수 있었다. 결과적으로 본 연구를 통해 수준 높은 기록문화의 추적을 통해, 역대 왕들의 위락문화를 연회형, 강무형, 유희형으로 유형화 할 수 있었고, 위락 활동(진찬, 회례연, 양로연, 대사례, 사신연 등은 물론 사냥, 활쏘기, 격구, 투호, 처용무, 낚시, 뱃놀이, 불꽃놀이 등) 전모와 장소성, 그리고 상징적 의미, 역사적인 전승과정과 위락문화 등을 복합적으로 탐색할 수 있었다.

• 유통과학연구
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• 제8권3호
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• pp.49-56
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• 2010

At the initial stage of Internet advertising, banner advertising came into fashion. As the Internet developed into a central part of daily lives and the competition in the on-line advertising market was getting fierce, there was not enough space for banner advertising, which rushed to portal sites only. All these factors was responsible for an upsurge in advertising prices. Consequently, the high-cost and low-efficiency problems with banner advertising were raised, which led to an emergence of keyword advertising as a new type of Internet advertising to replace its predecessor. In the beginning of 2000s, when Internet advertising came to be activated, display advertisement including banner advertising dominated the Net. However, display advertising showed signs of gradual decline, and registered minus growth in the year 2009, whereas keyword advertising showed rapid growth and started to outdo display advertising as of the year 2005. Keyword advertising refers to the advertising technique that exposes relevant advertisements on the top of research sites when one searches for a keyword. Instead of exposing advertisements to unspecified individuals like banner advertising, keyword advertising, or targeted advertising technique, shows advertisements only when customers search for a desired keyword so that only highly prospective customers are given a chance to see them. In this context, it is also referred to as search advertising. It is regarded as more aggressive advertising with a high hit rate than previous advertising in that, instead of the seller discovering customers and running an advertisement for them like TV, radios or banner advertising, it exposes advertisements to visiting customers. Keyword advertising makes it possible for a company to seek publicity on line simply by making use of a single word and to achieve a maximum of efficiency at a minimum cost. The strong point of keyword advertising is that customers are allowed to directly contact the products in question through its more efficient advertising when compared to the advertisements of mass media such as TV and radio, etc. The weak point of keyword advertising is that a company should have its advertisement registered on each and every portal site and finds it hard to exercise substantial supervision over its advertisement, there being a possibility of its advertising expenses exceeding its profits. Keyword advertising severs as the most appropriate methods of advertising for the sales and publicity of small and medium enterprises which are in need of a maximum of advertising effect at a low advertising cost. At present, keyword advertising is divided into CPC advertising and CPM advertising. The former is known as the most efficient technique, which is also referred to as advertising based on the meter rate system; A company is supposed to pay for the number of clicks on a searched keyword which users have searched. This is representatively adopted by Overture, Google's Adwords, Naver's Clickchoice, and Daum's Clicks, etc. CPM advertising is dependent upon the flat rate payment system, making a company pay for its advertisement on the basis of the number of exposure, not on the basis of the number of clicks. This method fixes a price for advertisement on the basis of 1,000-time exposure, and is mainly adopted by Naver's Timechoice, Daum's Speciallink, and Nate's Speedup, etc, At present, the CPC method is most frequently adopted. The weak point of the CPC method is that advertising cost can rise through constant clicks from the same IP. If a company makes good use of strategies for maximizing the strong points of keyword advertising and complementing its weak points, it is highly likely to turn its visitors into prospective customers. Accordingly, an advertiser should make an analysis of customers' behavior and approach them in a variety of ways, trying hard to find out what they want. With this in mind, her or she has to put multiple keywords into use when running for ads. When he or she first runs an ad, he or she should first give priority to which keyword to select. The advertiser should consider how many individuals using a search engine will click the keyword in question and how much money he or she has to pay for the advertisement. As the popular keywords that the users of search engines are frequently using are expensive in terms of a unit cost per click, the advertisers without much money for advertising at the initial phrase should pay attention to detailed keywords suitable to their budget. Detailed keywords are also referred to as peripheral keywords or extension keywords, which can be called a combination of major keywords. Most keywords are in the form of texts. The biggest strong point of text-based advertising is that it looks like search results, causing little antipathy to it. But it fails to attract much attention because of the fact that most keyword advertising is in the form of texts. Image-embedded advertising is easy to notice due to images, but it is exposed on the lower part of a web page and regarded as an advertisement, which leads to a low click through rate. However, its strong point is that its prices are lower than those of text-based advertising. If a company owns a logo or a product that is easy enough for people to recognize, the company is well advised to make good use of image-embedded advertising so as to attract Internet users' attention. Advertisers should make an analysis of their logos and examine customers' responses based on the events of sites in question and the composition of products as a vehicle for monitoring their behavior in detail. Besides, keyword advertising allows them to analyze the advertising effects of exposed keywords through the analysis of logos. The logo analysis refers to a close analysis of the current situation of a site by making an analysis of information about visitors on the basis of the analysis of the number of visitors and page view, and that of cookie values. It is in the log files generated through each Web server that a user's IP, used pages, the time when he or she uses it, and cookie values are stored. The log files contain a huge amount of data. As it is almost impossible to make a direct analysis of these log files, one is supposed to make an analysis of them by using solutions for a log analysis. The generic information that can be extracted from tools for each logo analysis includes the number of viewing the total pages, the number of average page view per day, the number of basic page view, the number of page view per visit, the total number of hits, the number of average hits per day, the number of hits per visit, the number of visits, the number of average visits per day, the net number of visitors, average visitors per day, one-time visitors, visitors who have come more than twice, and average using hours, etc. These sites are deemed to be useful for utilizing data for the analysis of the situation and current status of rival companies as well as benchmarking. As keyword advertising exposes advertisements exclusively on search-result pages, competition among advertisers attempting to preoccupy popular keywords is very fierce. Some portal sites keep on giving priority to the existing advertisers, whereas others provide chances to purchase keywords in question to all the advertisers after the advertising contract is over. If an advertiser tries to rely on keywords sensitive to seasons and timeliness in case of sites providing priority to the established advertisers, he or she may as well make a purchase of a vacant place for advertising lest he or she should miss appropriate timing for advertising. However, Naver doesn't provide priority to the existing advertisers as far as all the keyword advertisements are concerned. In this case, one can preoccupy keywords if he or she enters into a contract after confirming the contract period for advertising. This study is designed to take a look at marketing for keyword advertising and to present effective strategies for keyword advertising marketing. At present, the Korean CPC advertising market is virtually monopolized by Overture. Its strong points are that Overture is based on the CPC charging model and that advertisements are registered on the top of the most representative portal sites in Korea. These advantages serve as the most appropriate medium for small and medium enterprises to use. However, the CPC method of Overture has its weak points, too. That is, the CPC method is not the only perfect advertising model among the search advertisements in the on-line market. So it is absolutely necessary that small and medium enterprises including independent shopping malls should complement the weaknesses of the CPC method and make good use of strategies for maximizing its strengths so as to increase their sales and to create a point of contact with customers.

• 한국인구학
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• 제11권2호
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• pp.54-66
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• 1988

I. Introduction Since the 1970's drug abuse among young people has increasingly become a social problem in Korea. In the 1980's, drug abuse, especially glue sniffing, has become the cause of many unfortunated incidents resulting in harm to others as well as the abusers themselves. Taking into consideration of the seriousness of this problem, the Republic of Korea National Red Cross initiated a nation-wide research programme, to understand the present situation and to raise the level of public awareness. The goal of this research was to begin a nation - wide campaign against drug abuse. The research team was composed of the Advisary Committee members and the staff of the Youth Department of the Republic of Korea National Red Cross. The data were collected in February 1988 with the collaboration of the staff and volunteers in the local Chapters. The respondents were allocated nation-wide by the quota sampling method. The questionnaires were distributed to the respondents in three groups :2, 700 to junior and senior high school students, 605 to working youths, and 916 to delinquent youths. A total of 4, 221 questionnaires were collected. II. Characteristics of the Respondents The respondents in each group were selected evenly from rural and urban areas. The general characteristics of the respondents can be described as follow: in case of students, the proportions between male and female respondents, and between senior high school and junior high school students were almost evenly distributed. In case of working youths, the proportion of females (80.5%) was higher than those of the students and the delinquents groups. Delinquent youths were defined as those currently being under custody of the centers for juvenile delinquents. Of this number, 38.8% and 68.2% were junior and senior high school drop-outs respectively. The majority of them (92.6%) were male. As for the family background of the respondents, the proportion of those residing in poverty - stricken areas, and the proportion of those from broken families were higher in case of working youths and delinquent youths than those in case of students. III. Present Patterns of Drug Abuse The following summarizes the presents of drug abuse, as tabulated from the results of the survey. 1. Smoking The percentage of youths who smoke was 36% in the student group, 32% m the working youths group, and 94.4% in the delinquent youths group. 2. Alcohol 50.3% of students, 71.6% of working youths, and 93.3% of delinquent youths has experienced drinking alcohol beverages. 3. Tonic: non - alcoholic, caffeinated beverages popular in Korea and Japan The percentage of those who have used tonic at least once was over 90% in all of the three groups. 4. Sedative About 70% of each group has used sedative with the proportion of working youths use higher than those in other groups. 5. Stimulants Those who have used stimulants comprised around 15% in each group. 6. Tranquilizers Somewhat less than 5% of students and working youths, and 28% of delinquent youths, have used tranquilizers. 7. Hypnotics The users of hypnotics amounted to 0.4% of students, 2.6% of working youths and 7.1% of delinquent youths. 8. Marihuana Those who have used marihuana indicated 0.7% of students, 0.8% of working youths, and 13% of delinquent youths. 9. Glue-sniffing The percentage of glue-sniffing was 3.7%, 5% in the students group and in the youths group respectively, but the proportion was unusually high, at 40.7% in the delinquent youths group. From the results of the survey the present situation of drug abuse in Korea can be summarized as follows: 1. A high percentage of Korean youths have experienced smoking cigarettes and drinking alcoholic beverages. 2. Tonics (non - alcoholic, caffeinated beverages), antipyretic analgesics and stimulants quite regularly used. 3. Tranquilizers, hypnotics, marihuana and glue-sniffing are more widely used among delinquent youths than the other youths. From this fact, there exists a correlation between drug abuse and juvenile delinquency. IV. Time-series Analysis of the First Experience of Drug Abuse and Deviant Behaviour The respoundents were asked when they were first exposed to drugs and when they committed deviant acts. By calculating the average age of each experience, the following pattern was found (See Figure 1). Youths are first exposed to drugs by abuse of tonic(non - alcoholic, caffeinated beverages). At the age of 13, they amoke cigarettes, the use of antipyretic analgesics begins at 14 year old, while at the age of 15, they use tranquilizers, and at 16 hynotics. The period of drug abuse which starts from drinking caffeinated beverages and smoking cigarettes and ends in the use of hypnotics takes about three years. During this period, other delinquent behaviours begin to surface, that is, at the age of 13 when smoking cigarettes begins, the delinquent behaviour pattern starts with truancy. Next, they start taking money from others by using physical force. Prior to the age of 15, they are suspended from school, become hostile to adults, begin running away from home, and start using stimulants and alcohol. Soon they become involved even in glue-sniffing and in the use of marihuana. At the age of 15, they begin to see adult videos and carry weapons. Sexual promiscuity and usage of tranquilizers follows the viewing of adult videos. Consequently, by the time they reach the age of 16, they visit drinking establishments, and are picked up by police for committing delinquent acts. And finally, they come to use hypnotic - type drugs. From the above descriptions, drug abuse can be assumed to have a close correlation with delinquent behaviour. V. Social Factors Related to Drug Abuse As for the Korean youths, glue-sniffing is found to he related to aggressive delinquency, in such cases as run - aways, being picked up by the police, and taking money by force. Smoking cigarettes and drinking alcohol is found to be related to seeing adult videos and visiting drinking establishments. Hypnotics and marihuana were found to be representive of drugs which are related to degenerational delinquency, irrespective of social delinquency. The social factors connected with these drug abuse are as follows: 1. Individual factors Male students were more heavily involved in the usage of drug than females. Youths who do not attend church were more likely to be involved in drugs than those who attend. 2. Family factors The youths who were displeased with their mothers smoking and those who thought their parents did not love each other, or those whose parents had used drugs without prescription, were more likely to he drug users. 3. School factors Those youths who found school life boring, were unsuccessful in their studies, spend most of their time with friends, feel their teachers smoke too much, those who had a positive perception of their teachers smoking were likely to he drug users. To sum up, drug abusers depend on the influence of their parents, teachers and peers. IV. Reasons for Drug Abuse Korean students have mainly used drugs to release stress (42.8%), to stay awake (19.7%), and because of the easy accessibility of drugs( 16.6%). Other reasons are due to their ignorance of the side effects of the drugs (3.6%), natural curiosity (4.2%), and to increase strength(3.O%). From the above facts, the major reasons for drug abuse among Korean youths are to release stress and to stay awake in order to prepare exams. Furthermore, since drugs are readily available, we can conclude that drug abuse is caused by the school system(such as entrance exams) in Korea. VII. Conclusion Drug usage among Korean youths are relatively less common than those of western youths. In some cases, such as, glue-sniffing and use of stimulants, the pattern of drug abuse is found. Moreover, early drug abuse is evident, and it has a close connection with deviant behaviour, resulting in juvenile delinquency. Drug abuse cannot be attributed to any one social factor. Specifically, drug abuse depends on parents, peers, teachers and other members of the community, and also is influenced by social institutions such as the entrance exam system. Every person and organization concerned with youth must participate collectively in restraining drug abuse. Finally, it is suggested that social agencial working for youth welfare should make every effort to tackle this serious problem confronted by the Korean youths today.