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JH Cho

Publications and source records attributed to JH Cho.

At least 19 recordsLinked to original sources
PubMed2000

Indium-indium pair correlation and surface segregation in InGaAs alloys

In-In pair correlations and In surface segregation in In xGa 1-xAs alloys are studied by first-principles total-energy calculations. By calculating the substitution energy of a single In atom, we find that the near-surface energetics explains the observed In segregation on InGaAs(001)-beta2(2x4) surfaces. Indium surface segregation further enhances the In site selectivity, thus the long-range ordering. We find that the [110] and [001] In-In pair correlations are repulsive and nearly isotropic in bulk but are highly anisotropic near the (001) surface. The sign of the [110] In-In interaction energies vs the distance from the surface is oscillatory. These findings explain the recent puzzling cross-sectional x-STM results.

Journal Article↗
PubMed1996

Cervical Coring versus Noncoring Technique in Supracervical Laparoscopic Hysterectomy

We questioned whether cervical coring is necessary in laparoscopic supracervical hysterectomy. More than 250 laparoscopic supracervical hysterectomies have been done with transvaginal resection of the endocervical canal at our hospital since October 1992, and 35 cases without transvaginal resection of endocervical canal in 1995 and 1996. Women with suspicious cervical lesions and abnormal Papanicolaou smears were excluded from the noncoring technique. The purpose of coring the cervix is to prevent cancer in the remaining cervix, but the occurrence rate is the same as with an intact cervix. After comparing operating times, length of hospital stay, blood loss, and technique in both groups, we concluded that noncoring technique has many advantages over coring.

Journal Article↗