• 대한기계학회논문집
• /
• 제19권8호
• /
• pp.1832-1843
• /
• 1995

Tool interference is one of the most critical problems in sculptured surface machining. When machining cavities and concaves, the tool frequently overcuts the portions of the surface, which cause inaccuracy in machining. So tool interference-free paths must be generated for rough cutting more efficiently. In this paper a software using SSI(Surface/Surface intersection) algorithm is developed for eliminating tool interference which occurs in an offset surface in 3-dimensional free form surface modeling. this work consists of two stages : using the offset data, the intersection curves are rapidly checked by this algorithm at the first stage. CL(cutter location) data are obtained by deleting the loop section of intersected offset patches at the second stage. This algorithm can reduce the amount of memory required to store machining data and also easily check region which have the possibility of intersection. Also, This software is verified to be useful in machining a curved object on a DNC milling machine.

• 제어로봇시스템학회논문지
• /
• 제12권10호
• /
• pp.1035-1043
• /
• 2006

In this study, a translational 3-DOF parallel mechanism formed by constraining the Stewart Platform Mechanism is investigated. The translational 3-DOF parallel mechanism has three struts(3-UPS type serial subchains) and in addition, has a PPP type serial subchain in the middle of the mechanism. Firstly, the closed-form forward and reverse position solutions are derived for this mechanism. And analysis on kinematic characteristics using isotropic index of the Jacobian is conducted to examine effects of design parameters for the mechanism. Lastly, a prototype mechanism is implemented and the kinematic performance of the translational 3-DOF parallel mechanism was verified through experimental work.

• 통상정보연구
• /
• 제10권2호
• /
• pp.23-43
• /
• 2008

Requirement of facilitating electronic trade transactions and efforts to platform on the electronic trade in major countries are link to the interest of Bill of Lading, the major transportation document, to be electronic, namely interest in Electronic Bill of Lading. Regardless of the benefits from replacing paper based Bill of Lading to the electronic form, which are eliminating of the Crisis of Bill of Lading and cost saving of international trade community, it has not been successful so far. Among the three functions of Bill of Lading, evidence of contracts and receipt of goods can be easily transferable to the electronic form. However the most important function, Document of Title, became the hardest work to replicate in electronic form. The purpose of this paper is to clarify what kind of conditions shall be prepared to ensure the transfer of right and negotiability of the Electronic Bill of Lading and propose to ensure the use of electronic bill of lading and its transfer of right and negotiability in the era of the electronic transactions.

• 미생물학회지
• /
• 제8권2호
• /
• pp.65-68
• /
• 1970

In continuation of the previous work (The New Medical Journal, Vol. 12, No. 3, 111, 1969), the effects on the bactericidal activity against coli form group, on vitamin C content and ascorbate oxidase activity of the purple laver due to the $^{80}Co$ gamma-irradiation were studied. The results obtained are ; 1) After the 0.1m rad./hr. doses treatment of gamma-irradiation for 1 hours to the laver, the coli form group was being remarkably destoryed and after the application for 10 hours the coli form group was completely destroyed. 2) The content of vitamin C was gradually decreased during the gamma-irradiation to the laver. According to the sensory test, no changes in flavor nad color were indicated for 9-10 hours treatment. But, the loss of ascorbic was much than that of dehydroascorbic acid after 10-hour treatment. 3) And also, the ascorbate oxidase activity due to the irradiation waas conspicuously decreased.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2005년도 추계 학술논문 발표대회
• /
• pp.111-116
• /
• 2005

The formwork is very important in terms of time and cost of construction project. There have been ample research efforts regarding to technical issues such as types, specifications, and productivities. However, no previous research has addressed managerial requirements of the formwork. Thus, this paper investigated the present status of form work analyzing a case-study company, and derived an improvement plan for the formwork. The findings includes 1) the needs for increasing use of system forms in order to improve the quality and the safety and 2) further development of management system of formwork in order to enhance the efficiency.

• 설비공학논문집
• /
• 제7권1호
• /
• pp.98-111
• /
• 1995

The objective of this work is to investigate the form of equations of state for specific refrigerants. In particular, equations of the extended van der Waals form have been studied. As a result, a new equation of state has been developed and tested over ranges of pressure and density up to 5 and 1.5 times critical, respectively. The equation of state separates the compressibility factor into two parts. One is the repulsive compressibility factor and the other is attractive. The former is in the same form of Carnahan-Starling's repulsive term with constant hard-sphere volume. The latter is based on a combination of two different functions linear to density. The equation of state developed here has 12 adjustable parameters and correlates PVT data successfully. All properties are in reduced forms.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1997년도 봄 학술발표회 논문집
• /
• pp.451-459
• /
• 1997

Current domestic building market is in the face of a tise in construction cost as a result of labor cost and materials problems, so improvements for productivity are doing their best for finding a way out of the difficulties. But the most of technical of from work is just considered the basic role and shape. As for environment protection, the utilization of waste concrete is important. But many of studies were interesting on the resource recycling for structural concrete. The purpose of this study is the development of thin precast form using recycled aggregate and the assembling systems for permanent form by cast-in-place.

• 한국세라믹학회지
• /
• 제30권8호
• /
• pp.623-628
• /
• 1993

Lead monoxide has two phases at room temperature. One is a yellow orthorhombic phase, the other is a redtetragonal phase. Sometimes two phases are hybrided. The specificity of phase transitions of lead oxide is found during the milling of the batch including lead oxide. The pure orthorhombic phase of PbO can be transformed to the tetragonal phase perfectly by wet ball milling (milling liquid is distilled water) without thermal energy. However, when ethyl alcohol, isopropyl alcohol and aceton are used as milling liquid, respectively, the hybrid form of orthorhombic andtetragonal phases is obtained by wet ball milling. From the hybrid form heat-treated at $600^{\circ}C$ for 3hrs, this work results that mechanical phase transition of orthorhombic phase make a new form as distorted type orthorhombic phase of PbO.

• 한국생산제조학회지
• /
• 제18권5호
• /
• pp.455-461
• /
• 2009

In a scanning electron microscopy, image distortion is a critical issue and it is needed to be eliminated by some kinds of schemes. In this work, scanning frequency and scanning wave form are adjusted to have an improved image. The relationship between scan coil and its driver is investigated and appropriate frequency and wave form are suggested. It is proved that the selected frequency and wave form showed an enhanced image with less distortion, which were done by experiments. In addition, a noise elimination is addressed, providing improved image with a GROUND signal integration with the amplifier and the scan driver.

• 패션비즈니스
• /
• 제4권1호
• /
• pp.113-123
• /
• 2000

The purpose of this study is firstly to have the grasp of the tendency of animality represented in modern fashion. The second purpose is to analyze the form modeling of animality represented in modern fashion and the third one is to examine into an aesthetic character of animality represented in modern fashion. The method we adopt for this study is to analyze the designers' work which shows the fashion animality. The result of this study is follows. The tendency of animality represented in modern fashion presented in a printed form which patterned the animals' cuticle, a shape of animals, a symbolic image, and a future suggestive expression. The form modeling of animality is a reality and the aesthetic character is the vigorous beauty and the gorgeousness of original colors. So, animality represented in modern fashion is to offer the various ideas as well as to lead the curiosity about the fashion in the future and the coexistence into the fashion.