편심축력을 받는 철골구조 주각부의 지압강도

최문식(Mun Sik Choi),민병렬(Byung Yeol Min) 한국강구조학회 2003 韓國鋼構造學會 論文集 Vol.15 No.6

전시 대비 탄약공급체인에 관한 시뮬레이션 연구

최문식 ( Mun Sik Choi ),박세훈 ( Se Hoon Park ),문성암 ( Seong Am Moon ) 한국로지스틱스학회 2010 로지스틱스연구 Vol.18 No.3

전시 육군 탄약공급체인에서 복수채널이 최종전투원의 생존일수와 공급체인상의 재고수준에 어떠한 효과가 있는지를 측정하였다. 따라서 구체적인 효과측정을 위해 전시상황 시나리오를 달리하여 시스템 다이나믹스 시뮬레이션을 통해 분석하였다. 분석결과 최종전투원의 생존일수와 재고수준에 관한 동적특성을 제시하였으며 구체적인 시뮬레이션을 통하여 복수채널이 현 다단계 공급체인보다 재고량 및 대응수준에서 효과적임을 입증하였다는 점에서 의의를 가질 수 있다. Our military forces should operate the action using the ammunition that we currently hold befort military supplies are supplies are supported. Regarding this matterm the current ammumition supply chain needs to be changed to support the ammunition more effectively in times of war. In this study, any effects were measured regarding the final number of survived combatants and the inventory levels in the multi-channels of the army ammunition supply chain. The final result of this study offers the dynamic characteristics of the number of survived combatants and the inventory level. Also, it demonstrates that multi-channels are more effetive in both inventory levels and the response levels than the current multi-stage supply chain.

고력볼트 엇모배열된 ㄱ형강 인장접합부 블록전단파단에 관한 실험적 연구

최문식(Choi Mun-Sik) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.9

The purpose of this experimental study is to investigate the validity of code equation to calculate the block shear capacity in the limited state design codes of steel structures and to offer basic research data of the block shear rupture by comparison with the previous studies. According to result the tensile testing of staggered and double-row bolted connections by using high strength bolt of single angles are as followings; There are manifest difference between the actual shear rupture line and the theoretial shear rupture line if the block shear rupture is occurred. The professional factor tends to be more safe when the theoretical rupture line following is applied by code equation. Nevertheless, in the current limited state design codes of steel structures, it does not considered about the estimation of the actual rupture line, the effect of shear lag by the outstanding leg and the effect of eccentricity of load by using stagger in order to calculate the block shear capacity. Therefore, there must be an additional research about the effect of stagger and the reduction of capacity that is represented by the effect of eccentricity of load.

인장력을 받는 H형강 플랜지의 블록전단 파단에 관한 실험적 연구

김보영,권찬,최문식,Kim, Bo Young,Kwon, Chan,Choi, Mun Sik 한국강구조학회 1999 韓國鋼構造學會 論文集 Vol.11 No.3

본 연구는 1997년 제정된 강구조 한계상태설계법에 있어서 블록전단 설계기준식의 타당성을 규명하고 외국설계규준과 비교검토하기 위하여 인장력을 받는 H형강 플랜지의 접합부에 대한 블록전단 파단실험을 하였다. 실험결과 접합부는 대부분 인장항복-전단파단과 전단항복-인장파단에 의한 블록전단이 일어났으며 실험에 의한 블록파단하중이 기준식에 의한 내력보다 약 23% 크게 나타나 현재 기준식은 블록전단내력을 과소평가하고 있어 더 많은 연구가 필요하다고 사료된다. In this paper, an experimental study have been many studies on the propriety of block shear design code. according to limited state design criteria of steel structures recently established in Korea, by an experiment on the joint of H-Beam Flange tension members. The objects of this study were to compare with the results of other studies on block shear rupture mode and ultimate capacity, and to evaluate the propriety of the design criteria. The result is that the joint happened, two types, tension yield-shear ruptures and shear yield-tension ruptures, and the experimental rupture load was 23% higher than the capacity entered in the criteria design code In this criteria, it was found that ultimate strength of block shear of H-Beam Flange was lowly estimated. Therefore, we emphasize the need of estimates on the block shear rupture by carrying out many studies in this field.

인장력을 받는 ㄱ형강의 블록전단 파단에 관한 실험적 연구

김보영,이규광,최문식,Kim, Bo Young,Lee, Kyu Kwong,Choi, Mun Sik 한국강구조학회 1998 韓國鋼構造學會 論文集 Vol.10 No.4

강 구조물의 접합부는 구조물이 안전에 큰 영향을 미치는 부분으로서 이에 대한 연구는 많이 이루어지고 있으나 순수 인장력을 받는 접합부의 블록전단 파단에 대한 연구는 외국에서도 근래에 시작되었으며 현재 국내에서는 연구실적이 없는 상태이다. 본 연구는 최근 우리나라에서 제정된 강구조 한계상태설계기준에 따른 블록전단 산정식의 타당성을 인장력을 받는 ㄱ형강 접합부의 실험에 의하여 규명하고자 한다. 연구방법은 기존의 연구결과의 블록전단 파단형상 및 극한내력을 본 연구와 비교분석하고 기준 산정식의 합당성을 평가하였다. 실험결과 접합부는 2가지 형상, 인장항복 전단파단과 전단항복 인장파단이 일어났으며 실험 파단하중이 기준식에 의한 내력보다 약 15% 크게 나타나고 있어 앞으로 보다 많은 연구에 의해 강구조 한계상태 설계법의 블록전단 산정식에 대한 평가가 필요하다고 사료된다. In this paper, an experimental study have been many studies on the joints of steel structure, for it has great influences on the safety of structures. Research on block shear rupture of the joint receiving pure tension have been done in foreign countries, but not in Korea. This study focuses on the propriety of block shear design code, according to limited state design criteria of steel structures recently established in Korea, by an experiment on the joint of angle tension members. The methods of this study were to compare other study results on block shear rupture mode and ultimate capacity, and to evaluate the propriety of the criteria design code. The result is that tension yield shear ruptures and shear yield tension ruptures happened at the joint, and the experimental rupture load was 15% higher than the capacity entered in the criteria design code. We conclude that it is necessary to revaluate the block shear design code presented by many studies on the limited state design criteria of steel structures.

강구조 인장접합부의 블록전단 파괴에 관한 실험적 연구

이규광(Kyu Kwang Lee),최문식(Mun Sik Choi) 한국강구조학회 1997 韓國鋼構造學會誌 Vol.9 No.3

In this paper, an experimental study were performed to investigate the behavior, failure mode and ultimate strength of single angle tension members, which is designed to fail in block shear and is connected by high tension bolt. All of specimens brought out the rupture of block shear of two type, the rupture of tension plane and shear plane. The ultimate loads were compared with those predicted by the current Load and Resistance Factor Design (AISC-LRFD) and Allowable Stress Design(ASD) specifications and it was found that both methods were very accurate. It can be appreciated that the results of experiments apply to preliminary data for establishing of block shear design code.

농업경영 리스크 요인 분석: AHP와 IPA 분석

이소진(So-Jin Lee),최문식(Mun-Sik Choi),김종안(Jong-An Kim) 한국농촌지도학회 2016 농촌지도와 개발 Vol.23 No.3

This study has systematically classified·established the agricultural management risks from the agricultural company’s position and analyzed their counterplan situation in order to seek measures to counteract this. The AHP & IPA technique were used as an analysis method concerning the evaluation results. The counterplan situation was deduced through an interview investigation of 112 farmers who produce cabbage, white radish, onion, garlic, chili, and 6 other such items in order to stereotype the risks. If the agricultural companies’ management capacity is raised in accordance to the risk counterplan deduced from this study, and the risks of agricultural management activity are avoided ahead of time or counter means are activated, we can anticipate the stabilization of agricultural management.

하악 구치부 치주인대에서 발생한 변연성 백악질 섬유종의 치험례 : 증례보고

노충(Chung Noh),최문식(Mun Sik Choi),장도근(Do Geun Jang),김준연(Joon Yeun Kim) 대한구강악안면외과학회 1997 대한구강악안면외과학회지 Vol.23 No.1

Peripheral cementifying fibroma is histomorphologically similar to the central cementifying fibroma, but this lesion is unique to the gingival mucosa and is only rarely seen in edentulous area. In most instances, it arise from interdental papilla, with 80% occurring anterior to molar region. This lesion appears to involve the maxilla and mandible equally, demonstrates the highest occurrence rate during the second decade of life, and affects female more frequently than male, with 4.3:1 to 3:2. Peripheral cementifying fibroma presents as firm, pedunculated or sessile mass with an intact or ulcerated surface depending on the presence of trauma. Microscopically, it reveals a highly cellular mass of connective tissue containing numerous plump, proliferating fibrolasts and several forms of calcification. Effective treatment requires deep excision, which includes the ligament and periosteum, followed by a thorough root scaling of the adjacent teeth. A reveiw of the literature and a report of a case of peripheral cementifying fibroma are presented.

Ameloblastic Fibroma : A case report

양성일(Sung Il Yang),노충(Chung Noh),최문식(Mun Sik Choi),김준영(Joon Yeun Kim) 대한구강악안면외과학회 1995 대한구강악안면외과학회지 Vol.21 No.4

법랑아섬유종은 악안면 부위에서는 드물게 발생하는 혼합치성 종양으로써 상피성 및 중배엽성 요소를 모두 갖고 있으나 석회화 된 경조직은 함유하고 있지 않다. 임상적으로 이 종양은 평균 15세 이전의 연령에서 발생하며 성별차이는 없고 호발 부위는 하악 구치부이다. 무통성으로 천천히 성장하며 악골의 협측혹은 설측 피질골판을 팽창시켜 이환부의 종창을 유발하나 피질골로의 침윤성향은 보이지 않는다. 방사선학적으로는 법랑아세포종과의 구별이 어렵고 단방성 또는 다방성 방사선 투과성을 나타낸다. 치료는 병소와 보존적인 적출술이 추천되나 다양한 재발율이 보고되고 있으며 재발 증례에서는 보다 광범위한 외과적 절제술이 요구되기도 한다. 본 교실에는 하악골의 약 1/4를 침습한 비교적 큰 법랑아섬유종을 치료하여 추적 조사한바 임상적으로 양호한 결과와 다소와 지견을 얻었기에 보고하는 바이다. The ameloblastic fibroma is a relatively uncommon neoplasm of odontogenic origin which is characterized by the simultaneous proliferation of both epithelial and mesenchymal tissue without the formation of enamel or dentin. Clinically, the lesion occurs in the younger age group(average 15 years) with equal sex distribution. The mandible is affected most frequently, and the premolar area seems to be a favorite site. The tumor is slow growing and is generally considered beneign, destroying bone by local expansion in single or multilocular cavities. Radiographically, the ameloblastic fibroma has been described in various forms, ranging from a small unilocular radiolucency to a large multilocular lesion involving half of the mandible. The treatment of the ameloblastic fibroma has been more conservative than that of the simple ameloblastoma, but in case of a recurrent lesion a more aggressive surgical removal is recommended.

전시 육군탄약공급체인 설계에 관한 연구

문성암(Seong-Am Moon),이영(Young Lee),최문식(Mun-Sik Choi),박영일(Young-Il Park) 한국SCM학회 2012 한국SCM학회지 Vol.12 No.1

The purpose of this study is to propose the integrated simulation model for assessing how decoupling point and the emergency transhipment channel impact the total stock and the survival days of final combatants in the Army ammunition supply chain. Based on a rich combination of extensive literature review and insights gained through exploratory interviews, simulation methodology is used in developing the proposed model. Especially, simulation technique based on system dynamics is applied. We showed that moving a decoupling point to ATP(downstream) is more effective in order to increase survival days, but it is limited in implementation due to a lack of storage space and cost. Another way to increase survival days without changing a decoupling point is to add an emergency transhipment channel. Through the right combination of location of decoupling point and emergency transhipiment, the optimal Army ammunition supply chain can be designed.