철골세우기공사에서 영향요인 기반의 웹싸이클론 생산성 정보모델 및 활용에 관한 기초 연구

조재호,전재열,Cho, Jae-Ho,Chun, Jea-Youl 대한건축학회 2011 대한건축학회논문집 Vol.27 No.12

The purpose of this study is to present an impact factor-based web-cyclone productivity information model in a steel erection works. Since productivity should change according to impact factors, we need an analysis model that takes such the matter into account. This web-cyclone productivity analysis model reflects the impact factors of the projects, and hence it provides reliability to the productivity information of the relevant projects. The sensitivity analyses on each impact factor of the web-cyclone were carried out by changing the times required for the unit tasks that comprise the activities. The case data measurement from the work sites were used for the web-cyclone simulations of the steel erection and high tensioning bolt, and the differences in the productivity information were explored through a cross-comparative analysis on the web-cyclone information, expert interviews, and information of SMM(Standard Methods of Measurement). Furthermore, to make use of the web-cyclone information, this study additionally presents a case study on the development of schedule planning which considers the impact factors to the relevant projects.

확률적 평가에 의한 건설공사 비용 위험도 측정의 적용성에 관한 연구

조재호,전재열,Cho Jea-Ho,Chun Jae-Youl 한국건설관리학회 2000 건설관리 : 한국건설관리학회 학회지 Vol.1 No.1

건설공사비의 총액을 산정하기 위한 예비 견적은 위험의 정도를 감수하고 있다. 즉 대형 건설공사의 경우 오랜 기간에 걸쳐 수행되어지며 공종에 따른 공사기간별로 초기 계획단계보다 실행견적가에 미달하는 위험과 관련하여 발생되어진다. 이는 신뢰성 있는 유사비용데이터 수집의 어려움과 데이터의 수가 절대적으로 부족할 뿐만 아니라 이러한 수집된 비용데이터 조차도 건설공사의 특성을 충분히 반영하지 못하기 때문이다. 또한 통산 비용산정방법에 있어서 기존에 주로 활용되는 확정론적 비용평가는 다수의 불확실성을 띄고 있는 건설공사의 특수성을 반영하지 못하고 있다. 따라서 국내의 비용평가시 다루어지지 않고 있는 비용의 확률적 개념을 도입함으로서 비용의 위험도를 측정하고 비용요인들간의 상관성과 부위별 비용특성을 반영하여 견적시 과대 과소의 오차합계를 최소화하기 위한 방법을 제시하고자 한다. 여기서 위험도는 예비견적비가 실제 발주자 집행 실행견적가 보다 적게 될 확률로서 정의하고 본 방법의 제시에 따른 사례의 적용을 통해 객관적 인 검증을 연구의 목적으로 한다. 연구의 방법은 첫 번째, 비용 데이터로부터 직접적으로 위험도를 평가하는 통계학적 방법과 두 번째, 몬테칼로 시뮬레이션 방법을 이용하여 비용데이터로부터 간접적으로 위험도 평가방법을 제안하고자한다. 몬테칼로 시뮬레이션 방법은 단위 요소비용의 분포특성과 비용상관성으로부터 총비용의 확률분포를 생성하여 신뢰성 있는 비용 데이터의 확장과 해석이 가능한 방법으로 실제상황에 접근된 위험도 평가가 가능할 것이다. The paper considers two non-deterministic methods of analysing the risk exposure in a cost estimate The fist method(referred to as the 'conventional statistical' method) analyses cost data directly, to describe a probability distribution for total cost. The second method(referred to as the 'Monte Carlo simulation' method) interprets cost data directly, to generate a probability distribution for total costs from the descriptions of elemental cost distribution. The common practice of allowing for risk through an all-embracing contingency sum or percentage addition is challenged. Rather than excluding conventional, non-deterministic methods, they are here presented as possibly the only of effective foundation on which to risk management in cost estimating.

소아 급성 췌장염의 임상적 고찰

조재호,이태석,고영관,오수명,Cho, Jae-Ho,Lee, Tae-Seok,Ko, Young-Gwan,Oh, Soo-Myung 대한소아외과학회 1996 소아외과 Vol.2 No.1

Acute pancreatitis(AP) in children is not common but can be associated with severe morbidity rates and its diagnosis is often delayed. Thus, reported mortality rates range from 0 to 78%. We have treated 26 patients with AP from 5 to 17 years of age over the past 17 years. We are intended to assess the relevance of the prognostic criteria used to assess severity of adult AP and to review the etiology, clilical presentation, diagnosis, and management of AP in children. The authors retrospectively reviewed 26 children with AP managed in Kyung Hee University Hospital from 1978 to 1995. Among 26 patients with AP, male were 12, and female were 14. And the mean age of patients was 11.8 years. In 9(34.6%), no definitive cause was identified. Common causes of AP were trauma(23.1%) and biliary tract disease(23.1%). Other etiologies were viral infection(15.4%) and post ERCP(3.8%). The presenting features were abdominal pain(92.3%), vomiting(61.5%), fever(19.2%), submandibular pain(11.5%), and abdominal mass(7.6%). Back pain was rare(3.8%). Abdominal ultrasonographic findings were abnormal in 10 of 16 patients(62.5%) and abdominal CT findings were abnormal for 9 of 9 patients(100%). Seventeen patients(65.3%) were managed conservatively, and nine patients(34.6%) required surgical treatment. There was no mortality. To evaluate the severity of disease, we used the Imrie prognostic criteria used to assess the severity in adult AP. The number of positive criteria was correlated to the duration of hospitalization(r2=0.91) but statistically insignificant(p>0.05). But, the number of positive criteria was correlated to the operative incidence(r2=0.93) and statistically significant(p<0.05). The common causes of AP in children were unknown origin(34.6%), trauma(23.1%), and biliary tract disease(23.1%). Ultrasonography and computed tomography were useful imaging tools of AP in children. The Imrie criteria used to evaluate the severity in adult AP were suspected to be valuable to assess the severity of AP in children.

상용(商用) 데이터베이스:요점(要點)과 활용(活用)(5) - 이공학(理工學):일반 -

조재호,Cho, Jae-Ho 한국과학기술정보연구원 과학기술정보센터 1994 Journal of Information Science Theory and Practice Vol.25 No.2

이공학(理工學) 일반 분야의 데이터베이스는 요 및 해 사이 충실(充實)해졌으나, 화학(化學) 의학(醫學) 약학(藥學) 분야의 데이터베이스에 비하면 그 층(層)은 두껍다고 말할 수 있다. 아직 널리 사용되고 있는 데이터베이스의 종류(種類)도 실제로는 한정(限定)되어 있고, 일부를 제외(除外)하곤 거의가 외국제(外國製)이다. 본고(本稿)에서는 데이터베이스 시스템마다 제공(提供)되고 있는 주요한 데이터베이스의 종류(種類)와 특징(特徵), 이용(利用)의 요점과 활용법을 소개하였다. 현재로는 아직 문헌정보(文獻情報)의 활용이 중심이 되겠지만, 연구(硏究) 개발활동(開發活動)의 효율화를 증진시키기 위해선 팩트 데이터가 불가결(不可缺)하다. 채산적(採算的), 기술적(技術的)으로는 어려운 면도 있겠으나, 이 분야에 있어 상용(商用)의 팩트 데이터베이스를 가능한 한 시급히 정비(整備)할 필요가 있을 것이다. General branches of science and engineering now enjoy being substantially repleted in their databases. However, comparing the databases of such branches with chemistry or medical science and pharmacology, the strata do not seem to be fully equipped yet. As a matter of fact, the variety of such databases in practical application is still somewhat limited. Moreover, these databases are, with a few exceptions, prepared abroad. In this paper varieties and features of databases now available on the market for each database service system, as well as crucial points for practical use are introduced. At present, it is focussed more or less on the application of bibliographical information. Yet, it would be inevitable to equip them with factual data in order to increase the efficiency of research and development activities. Of course, it is still not easy to solve problems for better profitability and higher technical achievement. The author wishes to emphasize the necessity to fully equip the commercial factual database for said branches as quickly as possible.

Effect of Foreign Investors' Trade Amount by Nationality on Korean Stock Market

조재호,Cho, Jae-Ho The Society of Digital Policy and Management 2021 디지털융복합연구 Vol.19 No.8

주식자국편향이론에 따르면 외국인 투자자는 국내 투자자보다 정보가 적은 것으로 간주된다. 그러나 경제가 개방되어 가고 해외경제 혁신이 국내 경제에 큰 영향을 미치면 외국인 투자자가 정보보유자(informed trader)로서 투자할 가능성이 있다. 본 연구에서는 국적별 거래대금 정보에 독특한 특징이 있는지를 분석하였다. 이 연구가 발견한 것은 다음과 같이 요약할 수 있다. 첫째, 외국인 투자자의 거래 증가는 주식 수익률에 부(-)의 효과를 가진다. 이 부(-)의 효과는 국적에 따라 큰 차이가 없다. 이는 외국인 투자자들이 국적에 관계없이 강한 무리행동을 보인다는 것을 의미한다. 둘째, 외국인의 투자활동은 주가 변동성을 증가시키지만 그 영향은 크지 않다. 셋째, 외국인의 투자행태는 여전이 포지티브 피드백이다. 그러나 포지티브 피드백은 변화조짐이 있으며, 특히 미국과 케이만 제도의 펀드의 경우에 그러하다. 끝으로 조세피난처 펀드는 다른 외국인 투자자와 다른 투자전략을 가지고 있다. 그러나 한국과 밀접한 관련이 있는 것으로 추정되는 케이맨 제도 펀드는 룩셈부르크와 아일랜드 펀드와는 다른 양상을 가지고 있다. 이러한 결과들은 주식자국편향이론의 기반을 약화시킨다. According to the equity home bias theory, foreign investors are considered to have less information than native investors. However, as the economy becomes liberalized and overseas economic innovation has a great influence on the local economy, it is possible for foreign investors to invest as informed traders. This study analyzes whether information on trade amount by nationality has specific characteristics. The findings are summarized as follows. First, the increase in trading by foreign investors has negative effects on stock returns. There is no significant difference in these negative effects by nationality. This means that foreign investors show strong herd behavior regardless of nationality. Second, foreigners' investment activities increase stock price volatility, but the impact is not significant. Third, the behavior of foreign investors is still positive feedback. However, there are signs that positive feedback behavior may be changing, especially for funds from the United States and the Cayman Islands. Finally, tax haven zone funds have different investment strategies than other foreign investors. However, Cayman Islands funds, which are estimated to be closely related to Korea, are different from Luxembourg and Ireland funds. These findings undermine the fundamentals of the equity home bias theory.

상용(商用) 데이터베이스 : 요점(要點)과 활용(活用) (4) - 경제(經濟).산업(産業) -

조재호,Cho, Jae-Ho 한국과학기술정보연구원 과학기술정보센터 1994 Journal of Information Science Theory and Practice Vol.25 No.1

일본(日本)의 경제(經濟) 산업(産業) 분야의 분석(分析) 시스템 및 데이터베이스 역사는 장구하나, 전문성(專門性)이 강하여 이용자(利用者)가 한정되었다. 시스템 서비스가 본격화 된 것도 얼마되지 않는다. 본고(本稿)에서는 이 시스템 서비스의 대표적인 것을 해설하였다. 활용예(活用例)에 관해선 금리예측(金利豫測)을 예로 하여 도입(導入) 활용(活用) 상(上)의 유의점에 관해서도 설명하였다. 그밖에 신문정보(新開情報)의 확인에서 보다 고도의 것으로서 경제예측(經濟豫測)이나, 경제예측(經濟豫測)을 기반으로 한 각종 모델의 이용과 산업분석(産業分析)에 관해서도 다루었다. 조사(調査)나 연구(硏究)는 상호작용의 부분이 많아서 평상시부터 시스템에 익숙해야 하며, 이용자끼리 정보를 교환하고, 기회가 있을 때마다 헬프데스크를 활용하는 등 꾸준한 노력이 필요하다. Analysis systems and databases covering economics and industrial areas in Japan have long history, but due to considerable depth in specialty those have been used only by limited, certain patrons. It means that there are still few of practical system services at full scale. This paper describes the representative system services. Taking an example of interest prediction the author explains now to utilize systems and some points to be reminded. He also describes how to confirm newspaper information, how to predict economics, how to use various kinds of models based on economic prediction, and industrial analysis. Researches and studies are very often proceeded on economic prediction, and industrial analysis. Researches and studies are very often proceeded through interaction among researchers. So that we should make efforts continuously such as to rountinely get familiar with systems, to exchange information among users, to utilize helpdesks every time we need.

TightRope$^{TM}$ Device를 이용한 족근 중족 관절 손상의 치료(1예 보고)

조재호,오인석,Cho, Jae-Ho,Oh, In-Suk 대한족부족관절학회 2011 대한족부족관절학회지 Vol.15 No.4

Lisfranc injury is complex and difficult to treat. Making the correct diagnosis and achieving an anatomical reduction are important factors in regard to achieving a favorable outcome with this injury. We describe a new technique that we have found to be useful for stabilizing Lisfranc injury. This method is relatively fast and simple, and it provides non-rigid fixation. Also, it eliminates the need for implant removal. To date, we have achieved predictable results for stabilizing and treating this injury with the use of a $TightRope^{TM}$ Device, instead of traditional interfragmental screw fixation. In this report, we describe a case in which this method was used with satisfactory short-term results.

시멘트 유지형 임플란트 보철물의 유지력에 시멘트의 종류와 열순환이 미치는 영향에 관한 연구

조재호,정창모,전영찬,Cho Jae-Ho,Jeong Chang-Mo,Jeon Young-Chan 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.4

Statement of problem : In cemented implant-supported porstheses, it is still controversy what kind of cement to use. However, the effect of thermocycling on retentive strength of cemented implant-supported prostheses has not been well investigated. Purpose : This study was tested to evaluate the effects of various cements and thermocycling on retentive strengths of cemented implant-supported prostheses. Material and methods : Prefabricated implant abutments, height 5mm, diameter 6mm, 3-degree taper per side, with light chamfer margins were used. Ten specimens of two-unit fred partial denture were fabricated. The luting agents used for this study were three provisional luting agents which were Temp bond, Temp bond NE, IRM and four permanent luting agents which were Panavia F, Fuji-cem, Hy-bond Zinc cement, Hy-bond Polycarboxylate cement. 24 hours after cementation. the retentive strengths were measured by the universal testing machine with a cross-head speed of 0.5mm/min. Then cementation procedures were repeated and specimens were thermocycled 1000 times at temperature of $5^{\circ}C$ and $55^{\circ}C$. After thermocycling, the retentive strengths were measured. Results : Before thermocycling, the retentive strengths were decreased with the sequence of Panavia F. Fuji-cem. Hy-bond Zinc cement. Hy-bond Polycarboxylate cement, IRM, Temp bond NE and Temp bond, and there were significant differences among each groups(p<0.05). After thermocycling, the retentive strengths were decreased with the sequence of Panavia F. Fuji-cem, Hybond Zinc cement, Hy-bond Polycarboxylate cement, IRM, Temp bond NE and Temp bond, and there were no significant differences among Panavia F, Fuji-cem and Temp bond NE, Temp bond(p>0.05). The retentive strengths before and after thermocycling showed significant differences in Hy-bond Zinc cement. IRM, Temp bond NE and Temp bond(p<0.05). Conclusion : Within the limitation of this study, thermocycling do not affect the retentive strengths of permanent luting agents but the retentive strengths of temporary cements were reduced significantly after thermocyling.

상용(商用) 데이터베이스 : 요점(要點)과 활용(活用)(2) - 신문기사(新聞記事) -

조재호,Cho, Jae-Ho 한국과학기술정보연구원 과학기술정보센터 1993 Journal of Information Science Theory and Practice Vol.24 No.3

신문(新聞)은 정보원(情報源)으로서 이용도(利用度)가 높다. 각 신문사의 CTS의 도입으로 인하여 신문기사 데이터베이스화(化)가 촉진되어 상용(商用)으로 제공 서비스되는 신문기사의 데이터베이스도 많아졌다. 일본(日本)에서 이용되는 일본과 외국의 주된 신문기사 데이터베이스에 관하여 다음 사항(事項)을 해설하였다. 1) 수록기간, 갱신빈도, 타임 래그, 수록내용, 검색어, 출력 가능한 정보 등 데이터베이스의 특징, 2) 이용시(利用時)의 유의사항, 3) 기업조사, 업계 동향조사 등 조사 목적별의 이용 패턴 등이다. 이러한 데이터베이스는 전자정보의 형태로 이용이 가능하며, 장래에는 사내(社內)의 LAN과 결합하여 이용되리라고 예측된다. In order to respond to the public needs to utilize the newspapers as high-valued information resources, the number of the commercially available news items which are transformed into a form of database has been remarkably increased by the introduction of CTS into the newspaper companies. As for the domestically available Japanese and foreign newspaper article database, explanations are given to the following items. 1) Characteristics of database, such as date of coverage, frequency updating, time-lag, news sources, search terms, available information, etc. 2) Matters to be noticed at the utilization. 3) Pattern of utilization depending on the object of the investigation, such as the investigation of company, market trend, etc. Since the newspaper article database will be available in a form of digitized information, making the combination with the inter-company LAN system possible, increased opportunities to use it in near future are expected.

상용(商用) 데이터베이스 : 그 요점(要點)과 활용(活用)(1) - 데이터베이스 서비스의 동향(動向) -

조재호,Cho, Jae-Ho 한국과학기술정보연구원 과학기술정보센터 1993 Journal of Information Science Theory and Practice Vol.24 No.2

우리는 정보(情報)에 근거를 두고 행동을 취하고 있다. 따라서 효율적인 행동을 하려면 정보의 입수(入手) 루트를 잘 가꾸어야 한다. 여러 경로(經路)의 루트가 있지만, 특히 상용(商用) 데이터베이스는 이점(利點)이 크다. 더구나 대가를 지불하면 누구든 자유롭게 사용할 수 있으므로, 이용 여하에 따라서 정보(情報)의 입수에 상당한 격차(隔差)가 생기게 된다. 한편, 일본(日本)의 상용(商用) 데이터베이스 서비스는 출현된지 20여년이 지나 최근 많이 변화되었다. 예를 들면, 배치에서 온라인으로 그리고 CD-ROM의 등장에 의한 미디어의 다양화(多樣化)는 그 대표적인 예이다. 데이터베이스의 최신 동향을 살펴, 정보화시대(情報化時代)의 틀(도구(道具))로써 활용(活用)하는 것이 매우 중요하다. Nowadays we usually act based on information in order to act effectively, we should enlarge our access to information of course, we have several methods to choose from, but commercial databases are the most advantageous. One reason is that everyone has equal access to commercial databases. As a result, people or companies who use commercial database information skillfully have a distince advantage over those who don't commercial database services in japan have been changing rapidly since their birth more than twenty years ago. For example, the distribution mode of databases is changing : from the original batch(off line) to on-line and most recently to the coexistence of batch and on line with the advent of CD-ROM. It is important for us to keep up with the new trends in databases, and to utilize them effectively as a tool in the information age.